Merge pull request #65 from stefanprodan/release-3.3.0

Release v3.3.0

.circleci/config.yml

@@ -1,8 +1,51 @@
 version: 2.1
 jobs:
+  e2e-kubernetes:
+    machine: true
+    steps:
+      - checkout
+      - run:
+          name: Build podinfo container
+          command: e2e/build.sh
+      - run:
+          name: Start Kubernetes Kind cluster
+          command: e2e/bootstrap.sh
+      - run:
+          name: Install podinfo with Helm v3
+          command: e2e/install.sh
+      - run:
+          name: Run Helm tests
+          command: e2e/test.sh
+
+  push-container:
+    docker:
+      - image: circleci/golang:1.14
+    working_directory: ~/build
+    steps:
+      - checkout
+      - setup_remote_docker:
+          docker_layer_caching: false
+      - run: make build-container
+      - run: |
+          if [ -z "$CIRCLE_TAG" ]; then
+            echo "Not a release, skipping container push";
+          else
+            echo $DOCKER_PASS | docker login -u $DOCKER_USER --password-stdin;
+            echo $QUAY_PASS | docker login -u $QUAY_USER --password-stdin quay.io;
+            make push-container;
+            make push-base;
+          fi
+
+  push-binary:
+    docker:
+      - image: circleci/golang:1.14
+    steps:
+      - checkout
+      - run: curl -sL https://git.io/goreleaser | bash
+
   push-helm-charts:
     docker:
-      - image: circleci/golang:1.12
+      - image: circleci/golang:1.14
     steps:
       - checkout
       - run:
@@ -40,11 +83,29 @@ jobs:
             else
               echo "Not a release! Skip charts publish"
             fi
+
 workflows:
   version: 2
+  build-test:
+    jobs:
+      - e2e-kubernetes
   release:
     jobs:
+      - push-binary:
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              ignore: /^chart.*/
+      - push-container:
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              ignore: /^chart.*/
       - push-helm-charts:
+          requires:
+            - push-container
           filters:
             branches:
               ignore: /.*/

.github/policy/kubernetes.rego

@@ -0,0 +1,51 @@
+package kubernetes
+
+name = input.metadata.name
+
+kind = input.kind
+
+is_service {
+	input.kind = "Service"
+}
+
+is_deployment {
+	input.kind = "Deployment"
+}
+
+is_pod {
+	input.kind = "Pod"
+}
+
+split_image(image) = [image, "latest"] {
+	not contains(image, ":")
+}
+
+split_image(image) = [image_name, tag] {
+	[image_name, tag] = split(image, ":")
+}
+
+pod_containers(pod) = all_containers {
+	keys = {"containers", "initContainers"}
+	all_containers = [c | keys[k]; c = pod.spec[k][_]]
+}
+
+containers[container] {
+	pods[pod]
+	all_containers = pod_containers(pod)
+	container = all_containers[_]
+}
+
+containers[container] {
+	all_containers = pod_containers(input)
+	container = all_containers[_]
+}
+
+pods[pod] {
+	is_deployment
+	pod = input.spec.template
+}
+
+pods[pod] {
+	is_pod
+	pod = input
+}

.github/policy/rules.rego

@@ -0,0 +1,43 @@
+package main
+
+import data.kubernetes
+
+name = input.metadata.name
+
+# Deny containers with latest image tag
+deny[msg] {
+	kubernetes.containers[container]
+	[image_name, "latest"] = kubernetes.split_image(container.image)
+	msg = sprintf("%s in the %s %s has an image %s, using the latest tag", [container.name, kubernetes.kind, kubernetes.name, image_name])
+}
+
+# Deny services without app label selector
+service_labels {
+  input.spec.selector["app"]
+}
+deny[msg] {
+  kubernetes.is_service
+  not service_labels
+  msg = sprintf("Service %s should set app label selector", [name])
+}
+
+# Deny deployments without app label selector
+match_labels {
+  input.spec.selector.matchLabels["app"]
+}
+deny[msg] {
+  kubernetes.is_deployment
+  not match_labels
+  msg = sprintf("Service %s should set app label selector", [name])
+}
+
+# Warn if deployments have no prometheus pod annotations
+annotations {
+  input.spec.template.metadata.annotations["prometheus.io/scrape"]
+  input.spec.template.metadata.annotations["prometheus.io/port"]
+}
+warn[msg] {
+  kubernetes.is_deployment
+  not annotations
+  msg = sprintf("Deployment %s should set prometheus.io/scrape and prometheus.io/port pod annotations", [name])
+}

.github/workflows/test.yml

@@ -0,0 +1,17 @@
+on: [push, pull_request]
+name: test
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - name: kubeval
+        uses: stefanprodan/kube-tools@v1
+        with:
+          command: |
+            kustomize build ./kustomize | kubeval --strict
+      - name: conftest
+        uses: stefanprodan/kube-tools@v1
+        with:
+          command: |
+            kustomize build ./kustomize | conftest test -p .github/policy -

.travis.yml

@@ -1,32 +0,0 @@
-sudo: required
-language: go
-
-go:
-  - 1.12.x
-
-services:
-  - docker
-
-addons:
-  apt:
-    packages:
-      - docker-ce
-
-script:
-  - make build-container
-
-after_success:
-  - if [ -z "$TRAVIS_TAG" ]; then
-      echo "Not a release, skipping container push";
-    else
-      echo $DOCKER_PASS | docker login -u $DOCKER_USER --password-stdin;
-      echo $QUAY_PASS | docker login -u $QUAY_USER --password-stdin quay.io;
-      make push-container;
-    fi
-
-deploy:
-  - provider: script
-    skip_cleanup: true
-    script: curl -sL http://git.io/goreleaser | bash
-    on:
-      tags: true

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.12 as builder
+FROM golang:1.14 as builder
 
 RUN mkdir -p /podinfo/
 
@@ -6,7 +6,7 @@ WORKDIR /podinfo
 
 COPY . .
 
-RUN GOPROXY=https://proxy.golang.org go mod download
+RUN go mod download
 
 RUN go test -v -race ./...
 
@@ -20,7 +20,7 @@ RUN GIT_COMMIT=$(git rev-list -1 HEAD) && \
     -X github.com/stefanprodan/podinfo/pkg/version.REVISION=${GIT_COMMIT}" \
     -a -o bin/podcli cmd/podcli/*
 
-FROM alpine:3.10
+FROM alpine:3.11
 
 RUN addgroup -S app \
     && adduser -S -g app app \

Dockerfile.base

@@ -0,0 +1,10 @@
+FROM golang:1.14
+
+WORKDIR /workspace
+
+# copy modules manifests
+COPY go.mod go.mod
+COPY go.sum go.sum
+
+# cache modules
+RUN go mod download

Makefile

@@ -6,18 +6,25 @@ TAG?=latest
 NAME:=podinfo
 DOCKER_REPOSITORY:=stefanprodan
 DOCKER_IMAGE_NAME:=$(DOCKER_REPOSITORY)/$(NAME)
-GITCOMMIT:=$(shell git describe --dirty --always)
+GIT_COMMIT:=$(shell git describe --dirty --always)
 VERSION:=$(shell grep 'VERSION' pkg/version/version.go | awk '{ print $$4 }' | tr -d '"')
+EXTRA_RUN_ARGS?=
 
 run:
-	GO111MODULE=on go run cmd/podinfo/*
+	go run -ldflags "-s -w -X github.com/stefanprodan/podinfo/pkg/version.REVISION=$(GIT_COMMIT)" cmd/podinfo/* \
+	--level=debug --grpc-port=9999 --backend-url=https://httpbin.org/status/401 --backend-url=https://httpbin.org/status/500 \
+	--ui-logo=https://raw.githubusercontent.com/stefanprodan/podinfo/gh-pages/cuddle_clap.gif $(EXTRA_RUN_ARGS)
 
 test:
-	GO111MODULE=on go test -v -race ./...
+	go test -v -race ./...
 
 build:
-	GO111MODULE=on GIT_COMMIT=$$(git rev-list -1 HEAD) && GO111MODULE=on CGO_ENABLED=0 go build  -ldflags "-s -w -X github.com/stefanprodan/podinfo/pkg/version.REVISION=$${GIT_COMMIT}" -a -o ./bin/podinfo ./cmd/podinfo/*
-	GO111MODULE=on GIT_COMMIT=$$(git rev-list -1 HEAD) && GO111MODULE=on CGO_ENABLED=0 go build  -ldflags "-s -w -X github.com/stefanprodan/podinfo/pkg/version.REVISION=$${GIT_COMMIT}" -a -o ./bin/podcli ./cmd/podcli/*
+	GIT_COMMIT=$$(git rev-list -1 HEAD) && CGO_ENABLED=0 go build  -ldflags "-s -w -X github.com/stefanprodan/podinfo/pkg/version.REVISION=$(GIT_COMMIT)" -a -o ./bin/podinfo ./cmd/podinfo/*
+	GIT_COMMIT=$$(git rev-list -1 HEAD) && CGO_ENABLED=0 go build  -ldflags "-s -w -X github.com/stefanprodan/podinfo/pkg/version.REVISION=$(GIT_COMMIT)" -a -o ./bin/podcli ./cmd/podcli/*
+
+fmt:
+	gofmt -l -s -w ./
+	goimports -l -w ./
 
 build-charts:
 	helm lint charts/*
@@ -26,10 +33,27 @@ build-charts:
 build-container:
 	docker build -t $(DOCKER_IMAGE_NAME):$(VERSION) .
 
+build-base:
+	docker build -f Dockerfile.base -t $(DOCKER_REPOSITORY)/podinfo-base:latest .
+
+push-base: build-base
+	docker push $(DOCKER_REPOSITORY)/podinfo-base:latest
+
+test-container:
+	@docker rm -f podinfo || true
+	@docker run -dp 9898:9898 --name=podinfo $(DOCKER_IMAGE_NAME):$(VERSION)
+	@docker ps
+	@TOKEN=$$(curl -sd 'test' localhost:9898/token | jq -r .token) && \
+	curl -sH "Authorization: Bearer $${TOKEN}" localhost:9898/token/validate | grep test
+
 push-container:
+	docker tag $(DOCKER_IMAGE_NAME):$(VERSION) $(DOCKER_IMAGE_NAME):latest
 	docker push $(DOCKER_IMAGE_NAME):$(VERSION)
+	docker push $(DOCKER_IMAGE_NAME):latest
 	docker tag $(DOCKER_IMAGE_NAME):$(VERSION) quay.io/$(DOCKER_IMAGE_NAME):$(VERSION)
+	docker tag $(DOCKER_IMAGE_NAME):$(VERSION) quay.io/$(DOCKER_IMAGE_NAME):latest
 	docker push quay.io/$(DOCKER_IMAGE_NAME):$(VERSION)
+	docker push quay.io/$(DOCKER_IMAGE_NAME):latest
 
 version-set:
 	@next="$(TAG)" && \
@@ -39,8 +63,16 @@ version-set:
 	sed -i '' "s/appVersion: $$current/appVersion: $$next/g" charts/podinfo/Chart.yaml && \
 	sed -i '' "s/version: $$current/version: $$next/g" charts/podinfo/Chart.yaml && \
 	sed -i '' "s/podinfo:$$current/podinfo:$$next/g" kustomize/deployment.yaml && \
+	sed -i '' "s/podinfo:$$current/podinfo:$$next/g" deploy/webapp/frontend/deployment.yaml && \
+	sed -i '' "s/podinfo:$$current/podinfo:$$next/g" deploy/webapp/backend/deployment.yaml && \
+	sed -i '' "s/podinfo:$$current/podinfo:$$next/g" deploy/bases/frontend/deployment.yaml && \
+	sed -i '' "s/podinfo:$$current/podinfo:$$next/g" deploy/bases/backend/deployment.yaml && \
 	echo "Version $$next set in code, deployment, chart and kustomize"
 
 release:
 	git tag $(VERSION)
 	git push origin $(VERSION)
+
+swagger:
+	go get github.com/swaggo/swag/cmd/swag
+	cd pkg/api && $$(go env GOPATH)/bin/swag init -g server.go

README.md

@@ -1,10 +1,11 @@
 # podinfo
 
-[![Build Status](https://travis-ci.org/stefanprodan/podinfo.svg?branch=master)](https://travis-ci.org/stefanprodan/podinfo)
+[![CircleCI](https://circleci.com/gh/stefanprodan/podinfo.svg?style=svg)](https://circleci.com/gh/stefanprodan/podinfo)
+[![conftest](https://github.com/stefanprodan/podinfo/workflows/test/badge.svg)](https://github.com/stefanprodan/podinfo/blob/master/.github/workflows/test.yml)
+[![Go Report Card](https://goreportcard.com/badge/github.com/stefanprodan/podinfo)](https://goreportcard.com/report/github.com/stefanprodan/podinfo)
 [![Docker Pulls](https://img.shields.io/docker/pulls/stefanprodan/podinfo)](https://hub.docker.com/r/stefanprodan/podinfo)
 
-Podinfo is a tiny web application made with Go 
-that showcases best practices of running microservices in Kubernetes.
+Podinfo is a tiny web application made with Go that showcases best practices of running microservices in Kubernetes.
 
 Specifications:
 
@@ -13,10 +14,14 @@ Specifications:
 * File watcher for secrets and configmaps
 * Instrumented with Prometheus
 * Tracing with Istio and Jaeger
+* Linkerd service profile
 * Structured logging with zap 
 * 12-factor app with viper
 * Fault injection (random errors and latency)
-* Helm chart
+* Swagger docs
+* Helm and Kustomize installers
+* End-to-End testing with Kubernetes Kind and Helm
+* Kustomize testing with GitHub Actions and Open Policy Agent
 
 Web API:
 
@@ -36,34 +41,54 @@ Web API:
 * `POST /token` issues a JWT token valid for one minute `JWT=$(curl -sd 'anon' podinfo:9898/token | jq -r .token)`
 * `GET /token/validate` validates the JWT token `curl -H "Authorization: Bearer $JWT" podinfo:9898/token/validate`
 * `GET /configs` returns a JSON with configmaps and/or secrets mounted in the `config` volume
+* `POST /cache` saves the posted content to Redis and returns the SHA1 hash of the content
+* `GET /store/{hash}` returns the content from Redis if the key exists
 * `POST /store` writes the posted content to disk at /data/hash and returns the SHA1 hash of the content
 * `GET /store/{hash}` returns the content of the file /data/hash if exists
 * `GET /ws/echo` echos content via websockets `podcli ws ws://localhost:9898/ws/echo`
 * `GET /chunked/{seconds}` uses `transfer-encoding` type `chunked` to give a partial response and then waits for the specified period
+* `GET /swagger.json` returns the API Swagger docs, used for Linkerd service profiling and Gloo routes discovery
+
+gRPC API:
+
+* `/grpc.health.v1.Health/Check` health checking
+
+Web UI:
+
+![podinfo-ui](https://raw.githubusercontent.com/stefanprodan/podinfo/gh-pages/screens/podinfo-ui-v3.png)
+
+To access the Swagger UI open `<podinfo-host>/swagger/index.html` in a browser.
 
 ### Guides
 
+* [GitOps Progressive Deliver with Flagger, Helm v3 and Linkerd](https://helm.workshop.flagger.dev/intro/)
+* [GitOps Progressive Deliver on EKS with Flagger and AppMesh](https://eks.handson.flagger.dev/prerequisites/)
 * [Automated canary deployments with Flagger and Istio](https://medium.com/google-cloud/automated-canary-deployments-with-flagger-and-istio-ac747827f9d1)
 * [Kubernetes autoscaling with Istio metrics](https://medium.com/google-cloud/kubernetes-autoscaling-with-istio-metrics-76442253a45a)
+* [Autoscaling EKS on Fargate with custom metrics](https://aws.amazon.com/blogs/containers/autoscaling-eks-on-fargate-with-custom-metrics/)
 * [Managing Helm releases the GitOps way](https://medium.com/google-cloud/managing-helm-releases-the-gitops-way-207a6ac6ff0e)
-* [Expose Kubernetes services over HTTPS with Ngrok](https://stefanprodan.com/2018/expose-kubernetes-services-over-http-with-ngrok/)
+* [Securing EKS Ingress With Contour And Let’s Encrypt The GitOps Way](https://aws.amazon.com/blogs/containers/securing-eks-ingress-contour-lets-encrypt-gitops/)
 
 ### Install
 
 Helm:
 
 ```bash
-helm repo add sp https://stefanprodan.github.io/podinfo
+helm repo add podinfo https://stefanprodan.github.io/podinfo
 
 helm upgrade --install --wait frontend \
 --namespace test \
+--set replicaCount=2 \
 --set backend=http://backend-podinfo:9898/echo \
-sp/podinfo
+podinfo/podinfo
+
+# Test pods have hook-delete-policy: hook-succeeded
+helm test frontend
 
 helm upgrade --install --wait backend \
 --namespace test \
 --set hpa.enabled=true \
-sp/podinfo
+podinfo/podinfo
 ```
 
 Kustomize:
@@ -71,3 +96,9 @@ Kustomize:
 ```bash
 kubectl apply -k github.com/stefanprodan/podinfo//kustomize
 ```
+
+Docker:
+
+```bash
+docker run -dp 9898:9898 stefanprodan/podinfo
+```

charts/podinfo/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
-version: 2.0.0
-appVersion: 2.0.0
+version: 3.3.0
+appVersion: 3.3.0
 name: podinfo
 engine: gotpl
 description: Podinfo Helm chart for Kubernetes

charts/podinfo/README.md

@@ -8,7 +8,7 @@ that showcases best practices of running microservices in Kubernetes.
 To install the chart with the release name `my-release`:
 
 ```console
-$ helm repo add sp https://stefanprodan.github.io/k8s-podinfo
+$ helm repo add sp https://stefanprodan.github.io/podinfo
 $ helm upgrade my-release --install sp/podinfo 
 ```
 
@@ -29,45 +29,62 @@ The command removes all the Kubernetes components associated with the chart and
 
 The following tables lists the configurable parameters of the podinfo chart and their default values.
 
-Parameter | Description | Default
+Parameter | Default | Description
 --- | --- | ---
-`affinity` | node/pod affinities | None
-`color` | UI color | blue
-`backend` | echo backend URL | None
-`faults.delay` | random HTTP response delays between 0 and 5 seconds | `false`
-`faults.error` | 1/3 chances of a random HTTP response error | `false`
-`hpa.enabled` | enables HPA | `false`
-`hpa.cpu` | target CPU usage per pod | None
-`hpa.memory` | target memory usage per pod | None
-`hpa.requests` | target requests per second per pod | None
-`hpa.maxReplicas` | maximum pod replicas | `10`
-`ingress.hosts` | ingress accepted hostnames | None
-`ingress.tls` | ingress TLS configuration | None:
-`image.pullPolicy` | image pull policy | `IfNotPresent`
-`image.repository` | image repository | `stefanprodan/podinfo`
-`image.tag` | image tag | `0.0.1`
-`ingress.enabled` | enables ingress | `false`
-`ingress.annotations` | ingress annotations | None
-`ingress.hosts` | ingress accepted hostnames | None
-`ingress.tls` | ingress TLS configuration | None
-`message` | UI greetings message | None
-`nodeSelector` | node labels for pod assignment | `{}`
-`replicaCount` | desired number of pods | `2`
-`resources.requests/cpu` | pod CPU request | `1m`
-`resources.requests/memory` | pod memory request | `16Mi`
-`resources.limits/cpu` | pod CPU limit | None
-`resources.limits/memory` | pod memory limit | None
-`service.externalPort` | external port for the service | `9898`
-`service.internalPort` | internal port for the service | `9898`
-`service.nodePort` | node port for the service | `31198`
-`service.type` | type of service | `ClusterIP`
-`tolerations` | list of node taints to tolerate | `[]`
+`replicaCount` | `1` | Desired number of pods
+`logLevel` | `info` | Log level: `debug`, `info`, `warn`, `error`, `flat` or `panic`
+`backend` | `None` | Echo backend URL
+`backends` | `[]` | Array of echo backend URLs
+`cache` | `None` | Redis address in the format `<host>:<port>`
+`ui.color` | `#34577c` |  UI color
+`ui.message` | `None` |  UI greetings message
+`ui.logo` | `None` |  UI logo
+`faults.delay` | `false` | Random HTTP response delays between 0 and 5 seconds
+`faults.error` | `false` | 1/3 chances of a random HTTP response error
+`faults.unhealthy` | `false` | When set, the healthy state is never reached
+`faults.unready` | `false` | When set, the ready state is never reached
+`faults.testFail` | `false` | When set, a helm test is included which always fails
+`faults.testTimeout` | `false` | When set, a helm test is included which always times out
+`h2c.enabled` | `false` | Allow upgrading to h2c
+`image.repository` | `stefanprodan/podinfo` | Image repository
+`image.tag` | `<VERSION>` | Image tag
+`image.pullPolicy` | `IfNotPresent` | Image pull policy
+`service.enabled` | `true` | Create a Kubernetes Service, should be disabled when using [Flagger](https://flagger.app)
+`service.type` | `ClusterIP` | Type of the Kubernetes Service
+`service.metricsPort` | `9797` | Prometheus metrics endpoint port
+`service.httpPort` | `9898` | Container HTTP port
+`service.externalPort` | `9898` | ClusterIP HTTP port
+`service.grpcPort` | `9999` | ClusterIP gPRC port
+`service.grpcService` | `podinfo` | gPRC service name
+`service.nodePort` | `31198` | NodePort for the HTTP endpoint
+`hpa.enabled` | `false` | Enables the Kubernetes HPA
+`hpa.maxReplicas` | `10` | Maximum amount of pods
+`hpa.cpu` | `None` | Target CPU usage per pod
+`hpa.memory` | `None` | Target memory usage per pod
+`hpa.requests` | `None` | Target HTTP requests per second per pod
+`serviceAccount.enabled` | `false` | Whether a service account should be created
+`serviceAccount.name` | `None` | The name of the service account to use, if not set and create is true, a name is generated using the fullname template
+`linkerd.profile.enabled` | `false` | Create Linkerd service profile
+`serviceMonitor.enabled` | `false` | Whether a Prometheus Operator service monitor should be created
+`serviceMonitor.interval` | `15s` | Prometheus scraping interval
+`ingress.enabled` | `false` | Enables Ingress
+`ingress.annotations` | `{}` | Ingress annotations
+`ingress.path` | `/*` | Ingress path
+`ingress.hosts` | `[]` | Ingress accepted hosts
+`ingress.tls` | `[]` | Ingress TLS configuration
+`resources.requests.cpu` | `1m` | Pod CPU request
+`resources.requests.memory` | `16Mi` | Pod memory request
+`resources.limits.cpu` | `None` | Pod CPU limit
+`resources.limits.memory` | `None` | Pod memory limit
+`nodeSelector` | `{}` | Node labels for pod assignment
+`tolerations` | `[]` | List of node taints to tolerate
+`affinity` | `None` | Node/pod affinities
 
 Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`. For example,
 
 ```console
 $ helm install stable/podinfo --name my-release \
-  --set=image.tag=0.0.2,service.type=NodePort
+  --set=serviceMonitor.enabled=true,serviceMonitor.interval=5s
 ```
 
 Alternatively, a YAML file that specifies the values for the above parameters can be provided while installing the chart. For example,
@@ -77,5 +94,3 @@ $ helm install stable/podinfo --name my-release -f values.yaml
 ```
 
 > **Tip**: You can use the default [values.yaml](values.yaml)
-```
-

charts/podinfo/templates/NOTES.txt

@@ -11,9 +11,8 @@
      NOTE: It may take a few minutes for the LoadBalancer IP to be available.
            You can watch the status of by running 'kubectl get svc -w {{ template "podinfo.fullname" . }}'
   export SERVICE_IP=$(kubectl get svc --namespace {{ .Release.Namespace }} {{ template "podinfo.fullname" . }} -o jsonpath='{.status.loadBalancer.ingress[0].ip}')
-  echo http://$SERVICE_IP:{{ .Values.service.port }}
+  echo http://$SERVICE_IP:{{ .Values.service.externalPort }}
 {{- else if contains "ClusterIP" .Values.service.type }}
-  export POD_NAME=$(kubectl get pods --namespace {{ .Release.Namespace }} -l "app={{ template "podinfo.name" . }},release={{ .Release.Name }}" -o jsonpath="{.items[0].metadata.name}")
   echo "Visit http://127.0.0.1:8080 to use your application"
-  kubectl port-forward $POD_NAME 8080:{{ .Values.service.externalPort }}
+  kubectl -n {{ .Release.Namespace }} port-forward deploy/{{ template "podinfo.fullname" . }} 8080:{{ .Values.service.externalPort }}
 {{- end }}

charts/podinfo/templates/_helpers.tpl

@@ -30,3 +30,14 @@ Create chart name and version as used by the chart label.
 {{- define "podinfo.chart" -}}
 {{- printf "%s-%s" .Chart.Name .Chart.Version | replace "+" "_" | trunc 63 | trimSuffix "-" -}}
 {{- end -}}
+
+{{/*
+Create the name of the service account to use
+*/}}
+{{- define "podinfo.serviceAccountName" -}}
+{{- if .Values.serviceAccount.enabled -}}
+    {{ default (include "podinfo.fullname" .) .Values.serviceAccount.name }}
+{{- else -}}
+    {{ default "default" .Values.serviceAccount.name }}
+{{- end -}}
+{{- end -}}

charts/podinfo/templates/deployment.yaml

@@ -3,45 +3,79 @@ kind: Deployment
 metadata:
   name: {{ template "podinfo.fullname" . }}
   labels:
-    app: {{ template "podinfo.name" . }}
+    app: {{ template "podinfo.fullname" . }}
     chart: {{ template "podinfo.chart" . }}
     release: {{ .Release.Name }}
     heritage: {{ .Release.Service }}
 spec:
+  {{- if not .Values.hpa.enabled }}
   replicas: {{ .Values.replicaCount }}
+  {{- end }}
   strategy:
     type: RollingUpdate
     rollingUpdate:
       maxUnavailable: 1
   selector:
     matchLabels:
-      app: {{ template "podinfo.name" . }}
-      release: {{ .Release.Name }}
+      app: {{ template "podinfo.fullname" . }}
   template:
     metadata:
       labels:
-        app: {{ template "podinfo.name" . }}
-        release: {{ .Release.Name }}
+        app: {{ template "podinfo.fullname" . }}
       annotations:
-        prometheus.io/scrape: 'true'
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "{{ .Values.service.httpPort }}"
     spec:
       terminationGracePeriodSeconds: 30
+      {{- if .Values.serviceAccount.enabled }}
+      serviceAccountName: {{ template "podinfo.serviceAccountName" . }}
+      {{- end }}
       containers:
         - name: {{ .Chart.Name }}
           image: "{{ .Values.image.repository }}:{{ .Values.image.tag }}"
           imagePullPolicy: {{ .Values.image.pullPolicy }}
           command:
             - ./podinfo
-            - --port={{ .Values.service.containerPort }}
+            - --port={{ .Values.service.httpPort | default 9898 }}
+            {{- if .Values.service.metricsPort }}
+            - --port-metrics={{ .Values.service.metricsPort }}
+            {{- end }}
+            {{- if .Values.service.grpcPort }}
+            - --grpc-port={{ .Values.service.grpcPort }}
+            {{- end }}
+            {{- if .Values.service.grpcService }}
+            - --grpc-service-name={{ .Values.service.grpcService }}
+            {{- end }}
+            {{- range .Values.backends }}
+            - --backend-url={{ . }}
+            {{- end }}
+            {{- if .Values.cache }}
+            - --cache-server={{ .Values.cache }}
+            {{- end }}
             - --level={{ .Values.logLevel }}
             - --random-delay={{ .Values.faults.delay }}
             - --random-error={{ .Values.faults.error }}
+            {{- if .Values.faults.unhealthy }}
+            - --unhealthy
+            {{- end }}
+            {{- if .Values.faults.unready }}
+            - --unready
+            {{- end }}
+            {{- if .Values.h2c.enabled }}
+            - --h2c
+            {{- end }}
           env:
-          - name: PODINFO_UI_COLOR
-            value: {{ .Values.color }}
-          {{- if .Values.message }}
+          {{- if .Values.ui.message }}
           - name: PODINFO_UI_MESSAGE
-            value: {{ .Values.message }}
+            value: {{ quote .Values.ui.message }}
+          {{- end }}
+          {{- if .Values.ui.logo }}
+          - name: PODINFO_UI_LOGO
+            value: {{ .Values.ui.logo }}
+          {{- end }}
+          {{- if .Values.ui.color }}
+          - name: PODINFO_UI_COLOR
+            value: {{ .Values.ui.color }}
           {{- end }}
           {{- if .Values.backend }}
           - name: PODINFO_BACKEND_URL
@@ -49,16 +83,26 @@ spec:
           {{- end }}
           ports:
             - name: http
-              containerPort: {{ .Values.service.containerPort }}
+              containerPort: {{ .Values.service.httpPort | default 9898 }}
               protocol: TCP
+            {{- if .Values.service.metricsPort }}
+            - name: http-metrics
+              containerPort: {{ .Values.service.metricsPort }}
+              protocol: TCP
+            {{- end }}
+            {{- if .Values.service.grpcPort }}
+            - name: grpc
+              containerPort: {{ .Values.service.grpcPort }}
+              protocol: TCP
+            {{- end }}
           livenessProbe:
             exec:
               command:
               - podcli
               - check
               - http
-              - localhost:{{ .Values.service.containerPort }}/healthz
-            initialDelaySeconds: 5
+              - localhost:{{ .Values.service.httpPort | default 9898 }}/healthz
+            initialDelaySeconds: 1
             timeoutSeconds: 5
           readinessProbe:
             exec:
@@ -66,8 +110,8 @@ spec:
               - podcli
               - check
               - http
-              - localhost:{{ .Values.service.containerPort }}/readyz
-            initialDelaySeconds: 5
+              - localhost:{{ .Values.service.httpPort | default 9898 }}/readyz
+            initialDelaySeconds: 1
             timeoutSeconds: 5
           volumeMounts:
           - name: data

charts/podinfo/templates/hpa.yaml

@@ -5,7 +5,7 @@ metadata:
   name: {{ template "podinfo.fullname" . }}
 spec:
   scaleTargetRef:
-    apiVersion: apps/v1beta2
+    apiVersion: apps/v1
     kind: Deployment
     name: {{ template "podinfo.fullname" . }}
   minReplicas: {{ .Values.replicaCount }}

charts/podinfo/templates/ingress.yaml

@@ -1,6 +1,5 @@
 {{- if .Values.ingress.enabled -}}
 {{- $fullName := include "podinfo.fullname" . -}}
-{{- $servicePort := .Values.service.port -}}
 {{- $ingressPath := .Values.ingress.path -}}
 apiVersion: extensions/v1beta1
 kind: Ingress
@@ -36,4 +35,12 @@ spec:
               serviceName: {{ $fullName }}
               servicePort: http
   {{- end }}
+  {{- if not .Values.ingress.hosts }}
+    - http:
+        paths:
+          - path: {{ $ingressPath }}
+            backend:
+              serviceName: {{ $fullName }}
+              servicePort: http
+  {{- end }}
 {{- end }}

charts/podinfo/templates/linkerd.yaml

@@ -0,0 +1,88 @@
+{{- if .Values.linkerd.profile.enabled -}}
+apiVersion: linkerd.io/v1alpha2
+kind: ServiceProfile
+metadata:
+  name: {{ template "podinfo.fullname" . }}.{{ .Release.Namespace }}.svc.cluster.local
+spec:
+  routes:
+    - condition:
+        method: GET
+        pathRegex: /
+      name: GET /
+    - condition:
+        method: POST
+        pathRegex: /api/echo
+      name: POST /api/echo
+    - condition:
+        method: GET
+        pathRegex: /api/info
+      name: GET /api/info
+    - condition:
+        method: GET
+        pathRegex: /chunked/[^/]*
+      name: GET /chunked/{seconds}
+    - condition:
+        method: GET
+        pathRegex: /delay/[^/]*
+      name: GET /delay/{seconds}
+    - condition:
+        method: GET
+        pathRegex: /env
+      name: GET /env
+    - condition:
+        method: GET
+        pathRegex: /headers
+      name: GET /headers
+    - condition:
+        method: GET
+        pathRegex: /healthz
+      name: GET /healthz
+    - condition:
+        method: GET
+        pathRegex: /metrics
+      name: GET /metrics
+    - condition:
+        method: GET
+        pathRegex: /panic
+      name: GET /panic
+    - condition:
+        method: GET
+        pathRegex: /readyz
+      name: GET /readyz
+    - condition:
+        method: POST
+        pathRegex: /readyz/disable
+      name: POST /readyz/disable
+    - condition:
+        method: POST
+        pathRegex: /readyz/enable
+      name: POST /readyz/enable
+    - condition:
+        method: GET
+        pathRegex: /status/[^/]*
+      name: GET /status/{code}
+    - condition:
+        method: POST
+        pathRegex: /store
+      name: POST /store
+    - condition:
+        method: GET
+        pathRegex: /store/[^/]*
+      name: GET /store/{hash}
+    - condition:
+        method: POST
+        pathRegex: /token
+      name: POST /token
+    - condition:
+        method: POST
+        pathRegex: /token/validate
+      name: POST /token/validate
+    - condition:
+        method: GET
+        pathRegex: /version
+      name: GET /version
+    - condition:
+        method: POST
+        pathRegex: /ws/echo
+      name: POST /ws/echo
+{{- end }}

charts/podinfo/templates/service.yaml

@@ -1,3 +1,4 @@
+{{- if .Values.service.enabled -}}
 apiVersion: v1
 kind: Service
 metadata:
@@ -17,6 +18,12 @@ spec:
       {{- if (and (eq .Values.service.type "NodePort") (not (empty .Values.service.nodePort))) }}
       nodePort: {{ .Values.service.nodePort }}
       {{- end }}
+    {{- if .Values.service.grpcPort }}
+    - port: {{ .Values.service.grpcPort }}
+      targetPort: grpc
+      protocol: TCP
+      name: grpc
+    {{- end }}
   selector:
-    app: {{ template "podinfo.name" . }}
-    release: {{ .Release.Name }}
+    app: {{ template "podinfo.fullname" . }}
+{{- end }}

charts/podinfo/templates/serviceaccount.yaml

@@ -0,0 +1,11 @@
+{{- if .Values.serviceAccount.enabled -}}
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: {{ template "podinfo.serviceAccountName" . }}
+  labels:
+    app: {{ template "podinfo.name" . }}
+    chart: {{ template "podinfo.chart" . }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+{{- end -}}

charts/podinfo/templates/servicemonitor.yaml

@@ -0,0 +1,19 @@
+{{- if .Values.serviceMonitor.enabled -}}
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  name: {{ template "podinfo.fullname" . }}
+  labels:
+    app: {{ template "podinfo.name" . }}
+    chart: {{ template "podinfo.chart" . }}
+    release: {{ .Release.Name }}
+    heritage: {{ .Release.Service }}
+spec:
+  endpoints:
+    - path: /metrics
+      port: http
+      interval: {{ .Values.serviceMonitor.interval }}
+  selector:
+    matchLabels:
+      app: {{ template "podinfo.fullname" . }}
+{{- end }}

charts/podinfo/templates/tests/fail.yaml

@@ -0,0 +1,26 @@
+{{- if .Values.faults.test }}
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: {{ template "podinfo.fullname" . }}-fault-test-{{ randAlphaNum 5 | lower }}
+  labels:
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    app: {{ template "podinfo.name" . }}
+  annotations:
+    "helm.sh/hook": test
+    "helm.sh/hook-delete-policy": before-hook-creation,hook-succeeded
+    sidecar.istio.io/inject: "false"
+    linkerd.io/inject: disabled
+    appmesh.k8s.aws/sidecarInjectorWebhook: disabled
+spec:
+  template:
+    spec:
+      containers:
+        - name: fault
+          image: alpine:3.11
+          command: ['/bin/sh']
+          args:  ['-c', 'exit 1']
+      restartPolicy: Never
+{{- end }}

charts/podinfo/templates/tests/grpc.yaml

@@ -0,0 +1,24 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: {{ template "podinfo.fullname" . }}-grpc-test-{{ randAlphaNum 5 | lower }}
+  labels:
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    app: {{ template "podinfo.name" . }}
+  annotations:
+    "helm.sh/hook": test
+    "helm.sh/hook-delete-policy": before-hook-creation,hook-succeeded
+    sidecar.istio.io/inject: "false"
+    linkerd.io/inject: disabled
+    appmesh.k8s.aws/sidecarInjectorWebhook: disabled
+spec:
+  template:
+    spec:
+      containers:
+        - name: grpc-health-probe
+          image: stefanprodan/grpc_health_probe:v0.3.0
+          command: ['grpc_health_probe']
+          args:  ['-addr={{ template "podinfo.fullname" . }}.{{ .Release.Namespace }}:{{ .Values.service.grpcPort }}']
+      restartPolicy: Never

charts/podinfo/templates/tests/jwt.yaml

@@ -0,0 +1,31 @@
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: {{ template "podinfo.fullname" . }}-jwt-test-{{ randAlphaNum 5 | lower }}
+  labels:
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    app: {{ template "podinfo.name" . }}
+  annotations:
+    "helm.sh/hook": test
+    "helm.sh/hook-delete-policy": before-hook-creation,hook-succeeded
+    sidecar.istio.io/inject: "false"
+    linkerd.io/inject: disabled
+    appmesh.k8s.aws/sidecarInjectorWebhook: disabled
+spec:
+  template:
+    spec:
+      containers:
+        - name: tools
+          image: giantswarm/tiny-tools
+          command:
+            - sh
+            - -c
+            - |
+              TOKEN=$(curl -sd 'test' ${PODINFO_SVC}/token | jq -r .token) &&
+              curl -sH "Authorization: Bearer ${TOKEN}" ${PODINFO_SVC}/token/validate | grep test
+          env:
+          - name: PODINFO_SVC
+            value: "{{ template "podinfo.fullname" . }}.{{ .Release.Namespace }}:{{ .Values.service.externalPort }}"
+      restartPolicy: Never

charts/podinfo/templates/tests/service.yaml

@@ -1,5 +1,5 @@
-apiVersion: v1
-kind: Pod
+apiVersion: batch/v1
+kind: Job
 metadata:
   name: {{ template "podinfo.fullname" . }}-service-test-{{ randAlphaNum 5 | lower }}
   labels:
@@ -8,11 +8,23 @@ metadata:
     chart: {{ .Chart.Name }}-{{ .Chart.Version }}
     app: {{ template "podinfo.name" . }}
   annotations:
-    "helm.sh/hook": test-success
+    "helm.sh/hook": test
+    "helm.sh/hook-delete-policy": before-hook-creation,hook-succeeded
+    sidecar.istio.io/inject: "false"
+    linkerd.io/inject: disabled
+    appmesh.k8s.aws/sidecarInjectorWebhook: disabled
 spec:
-  containers:
-    - name: curl
-      image: radial/busyboxplus:curl
-      command: ['curl']
-      args:  ['{{ template "podinfo.fullname" . }}:{{ .Values.service.externalPort }}']
-  restartPolicy: Never
+  template:
+    spec:
+      containers:
+        - name: curl
+          image: curlimages/curl:7.69.0
+          command:
+            - sh
+            - -c
+            - |
+              curl -s ${PODINFO_SVC}/api/info | grep version
+          env:
+            - name: PODINFO_SVC
+              value: "{{ template "podinfo.fullname" . }}.{{ .Release.Namespace }}:{{ .Values.service.externalPort }}"
+      restartPolicy: Never

charts/podinfo/templates/tests/storage.yaml

@@ -1,41 +0,0 @@
-apiVersion: v1
-kind: Pod
-metadata:
-  name: {{ template "podinfo.fullname" . }}-storage-test-{{ randAlphaNum 5 | lower }}
-  labels:
-    heritage: {{ .Release.Service }}
-    release: {{ .Release.Name }}
-    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
-    app: {{ template "podinfo.name" . }}
-  annotations:
-    "helm.sh/hook": test-success
-spec:
-  containers:
-    - name: tools
-      image: giantswarm/tiny-tools
-      command: ["/bin/sh", "/scripts/ping.sh"]
-      env:
-      - name: PODINFO_SVC
-        value: {{ template "podinfo.fullname" . }}:{{ .Values.service.externalPort }}
-      volumeMounts:
-      - name: scripts
-        mountPath: /scripts
-  restartPolicy: Never
-  volumes:
-  - name: scripts
-    configMap:
-      name: {{ template "podinfo.fullname" . }}-storage-cfg
----
-apiVersion: v1
-kind: ConfigMap
-metadata:
-  name: {{ template "podinfo.fullname" . }}-storage-cfg
-  labels:
-    heritage: {{ .Release.Service }}
-    release: {{ .Release.Name }}
-    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
-    app: {{ template "podinfo.name" . }}
-data:
-  ping.sh: |
-    #!/bin/sh
-    curl -sS ${PODINFO_SVC}/store/$(curl -sSd 'test' ${PODINFO_SVC}/store | jq -r .hash) |grep test

charts/podinfo/templates/tests/timeout.yaml

@@ -0,0 +1,26 @@
+{{- if .Values.faults.test }}
+apiVersion: batch/v1
+kind: Job
+metadata:
+  name: {{ template "podinfo.fullname" . }}-fault-test-{{ randAlphaNum 5 | lower }}
+  labels:
+    heritage: {{ .Release.Service }}
+    release: {{ .Release.Name }}
+    chart: {{ .Chart.Name }}-{{ .Chart.Version }}
+    app: {{ template "podinfo.name" . }}
+  annotations:
+    "helm.sh/hook": test
+    "helm.sh/hook-delete-policy": before-hook-creation,hook-succeeded
+    sidecar.istio.io/inject: "false"
+    linkerd.io/inject: disabled
+    appmesh.k8s.aws/sidecarInjectorWebhook: disabled
+spec:
+  template:
+    spec:
+      containers:
+        - name: fault
+          image: alpine:3.11
+          command: ['/bin/sh']
+          args:  ['-c', 'while sleep 3600; do :; done']
+      restartPolicy: Never
+{{- end }}

charts/podinfo/values.yaml

@@ -2,23 +2,39 @@
 
 replicaCount: 1
 logLevel: info
-color: blue
 backend: #http://backend-podinfo:9898/echo
-message: #UI greetings
+backends: []
+cache: ""
+
+ui:
+  color: "#34577c"
+  message: ""
+  logo: ""
 
 faults:
   delay: false
   error: false
+  unhealthy: false
+  unready: false
+  testFail: false
+  testTimeout: false
+
+h2c:
+  enabled: false
 
 image:
-  repository: quay.io/stefanprodan/podinfo
-  tag: 2.0.0
+  repository: stefanprodan/podinfo
+  tag: 3.3.0
   pullPolicy: IfNotPresent
 
 service:
+  enabled: true
   type: ClusterIP
+  metricsPort: 9797
+  httpPort: 9898
   externalPort: 9898
-  containerPort: 9898
+  grpcPort: 9999
+  grpcService: podinfo
   nodePort: 31198
 
 # metrics-server add-on required
@@ -32,14 +48,29 @@ hpa:
   # average http requests per second per pod (k8s-prometheus-adapter)
   requests:
 
+serviceAccount:
+  # Specifies whether a service account should be created
+  enabled: false
+  # The name of the service account to use.
+  # If not set and create is true, a name is generated using the fullname template
+  name:
+
+linkerd:
+  profile:
+    enabled: false
+
+serviceMonitor:
+  enabled: false
+  interval: 15s
+
 ingress:
   enabled: false
   annotations: {}
     # kubernetes.io/ingress.class: nginx
     # kubernetes.io/tls-acme: "true"
-  path: /
-  hosts:
-    - podinfo.local
+  path: /*
+  hosts: []
+#    - podinfo.local
   tls: []
   #  - secretName: chart-example-tls
   #    hosts:

cmd/podcli/check.go

@@ -14,14 +14,19 @@ import (
 
 	"github.com/spf13/cobra"
 	"go.uber.org/zap"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/health/grpc_health_v1"
+	"google.golang.org/grpc/status"
 )
 
 var (
-	retryCount int
-	retryDelay time.Duration
-	method     string
-	body       string
-	timeout    time.Duration
+	retryCount      int
+	retryDelay      time.Duration
+	method          string
+	body            string
+	timeout         time.Duration
+	grpcServiceName string
 )
 
 var checkCmd = &cobra.Command{
@@ -51,6 +56,13 @@ var checkCertCmd = &cobra.Command{
 	RunE:    runCheckCert,
 }
 
+var checkgRPCCmd = &cobra.Command{
+	Use:     `grpc [address]`,
+	Short:   "gRPC health check",
+	Example: `  check grpc localhost:8080 --service=podinfo --retry=1 --delay=2s --timeout=2s`,
+	RunE:    runCheckgPRC,
+}
+
 func init() {
 	checkUrlCmd.Flags().StringVar(&method, "method", "GET", "HTTP method")
 	checkUrlCmd.Flags().StringVar(&body, "body", "", "HTTP POST/PUT content")
@@ -64,6 +76,12 @@ func init() {
 	checkTcpCmd.Flags().DurationVar(&timeout, "timeout", 5*time.Second, "timeout")
 	checkCmd.AddCommand(checkTcpCmd)
 
+	checkgRPCCmd.Flags().IntVar(&retryCount, "retry", 0, "times to retry the TCP check")
+	checkgRPCCmd.Flags().DurationVar(&retryDelay, "delay", 1*time.Second, "wait duration between retries")
+	checkgRPCCmd.Flags().DurationVar(&timeout, "timeout", 5*time.Second, "timeout")
+	checkgRPCCmd.Flags().StringVar(&grpcServiceName, "service", "", "gRPC service name")
+	checkCmd.AddCommand(checkgRPCCmd)
+
 	checkCmd.AddCommand(checkCertCmd)
 
 	rootCmd.AddCommand(checkCmd)
@@ -243,3 +261,53 @@ func fmtContentLength(b int64) string {
 	}
 	return fmt.Sprintf("%.1f %cB", float64(b)/float64(div), "kMGTPE"[exp])
 }
+
+func runCheckgPRC(cmd *cobra.Command, args []string) error {
+	if retryCount < 0 {
+		return fmt.Errorf("--retry is required")
+	}
+	if len(args) < 1 {
+		return fmt.Errorf("address is required! example: check grpc localhost:8080")
+	}
+	address := args[0]
+
+	for n := 0; n <= retryCount; n++ {
+		if n != 1 {
+			time.Sleep(retryDelay)
+		}
+
+		conn, err := grpc.Dial(address, grpc.WithInsecure())
+		if err != nil {
+			logger.Info("check failed",
+				zap.String("address", address),
+				zap.Error(err))
+			continue
+		}
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
+		resp, err := grpc_health_v1.NewHealthClient(conn).Check(ctx, &grpc_health_v1.HealthCheckRequest{
+			Service: grpcServiceName,
+		})
+		cancel()
+
+		if err != nil {
+			if stat, ok := status.FromError(err); ok && stat.Code() == codes.Unimplemented {
+				logger.Info("gPRC health protocol not implemented")
+				os.Exit(1)
+			} else {
+				logger.Info("check failed",
+					zap.String("address", address),
+					zap.Error(err))
+			}
+			continue
+		}
+
+		conn.Close()
+		logger.Info("check succeed",
+			zap.String("status", resp.GetStatus().String()))
+		os.Exit(0)
+
+	}
+
+	os.Exit(1)
+	return nil
+}

cmd/podcli/main.go

@@ -2,11 +2,12 @@ package main
 
 import (
 	"fmt"
-	"github.com/spf13/cobra"
-	"go.uber.org/zap"
 	"log"
 	"os"
 	"strings"
+
+	"github.com/spf13/cobra"
+	"go.uber.org/zap"
 )
 
 var rootCmd = &cobra.Command{

cmd/podcli/version.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+
 	"github.com/spf13/cobra"
 	"github.com/stefanprodan/podinfo/pkg/version"
 )

cmd/podinfo/main.go

@@ -2,28 +2,33 @@ package main
 
 import (
 	"fmt"
-	"github.com/spf13/pflag"
-	"github.com/spf13/viper"
-	"github.com/stefanprodan/podinfo/pkg/api"
-	"github.com/stefanprodan/podinfo/pkg/signals"
-	"github.com/stefanprodan/podinfo/pkg/version"
-	"go.uber.org/zap"
-	"go.uber.org/zap/zapcore"
 	"io/ioutil"
 	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
 	"time"
+
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+
+	"github.com/stefanprodan/podinfo/pkg/api"
+	"github.com/stefanprodan/podinfo/pkg/grpc"
+	"github.com/stefanprodan/podinfo/pkg/signals"
+	"github.com/stefanprodan/podinfo/pkg/version"
 )
 
 func main() {
 	// flags definition
 	fs := pflag.NewFlagSet("default", pflag.ContinueOnError)
-	fs.Int("port", 9898, "port")
+	fs.Int("port", 9898, "HTTP port")
 	fs.Int("port-metrics", 0, "metrics port")
+	fs.Int("grpc-port", 0, "gRPC port")
+	fs.String("grpc-service-name", "podinfo", "gPRC service name")
 	fs.String("level", "info", "log level debug, info, warn, error, flat or panic")
-	fs.String("backend-url", "", "backend service URL")
+	fs.StringSlice("backend-url", []string{}, "backend service URL")
 	fs.Duration("http-client-timeout", 2*time.Minute, "client timeout duration")
 	fs.Duration("http-server-timeout", 30*time.Second, "server read and write timeout duration")
 	fs.Duration("http-server-shutdown-timeout", 5*time.Second, "server graceful shutdown timeout duration")
@@ -31,12 +36,17 @@ func main() {
 	fs.String("config-path", "", "config dir path")
 	fs.String("config", "config.yaml", "config file name")
 	fs.String("ui-path", "./ui", "UI local path")
-	fs.String("ui-color", "blue", "UI color")
+	fs.String("ui-logo", "", "UI logo")
+	fs.String("ui-color", "#34577c", "UI color")
 	fs.String("ui-message", fmt.Sprintf("greetings from podinfo v%v", version.VERSION), "UI message")
+	fs.Bool("h2c", false, "allow upgrading to H2C")
 	fs.Bool("random-delay", false, "between 0 and 5 seconds random delay")
 	fs.Bool("random-error", false, "1/3 chances of a random response error")
-	fs.Int("stress-cpu", 0, "Number of CPU cores with 100 load")
+	fs.Bool("unhealthy", false, "when set, healthy state is never reached")
+	fs.Bool("unready", false, "when set, ready state is never reached")
+	fs.Int("stress-cpu", 0, "number of CPU cores with 100 load")
 	fs.Int("stress-memory", 0, "MB of data to load into memory")
+	fs.String("cache-server", "", "Redis address in the format <host>:<port>")
 
 	versionFlag := fs.BoolP("version", "v", false, "get version number")
 
@@ -59,6 +69,7 @@ func main() {
 	viper.RegisterAlias("backendUrl", "backend-url")
 	hostname, _ := os.Hostname()
 	viper.SetDefault("jwt-secret", "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9")
+	viper.SetDefault("ui-logo", "https://raw.githubusercontent.com/stefanprodan/podinfo/gh-pages/cuddle_clap.gif")
 	viper.Set("hostname", hostname)
 	viper.Set("version", version.VERSION)
 	viper.Set("revision", version.REVISION)
@@ -90,6 +101,18 @@ func main() {
 		viper.Set("port", strconv.Itoa(port))
 	}
 
+	// load gRPC server config
+	var grpcCfg grpc.Config
+	if err := viper.Unmarshal(&grpcCfg); err != nil {
+		logger.Panic("config unmarshal failed", zap.Error(err))
+	}
+
+	// start gRPC server
+	if grpcCfg.Port > 0 {
+		grpcSrv, _ := grpc.NewServer(&grpcCfg, logger)
+		go grpcSrv.ListenAndServe()
+	}
+
 	// load HTTP server config
 	var srvCfg api.Config
 	if err := viper.Unmarshal(&srvCfg); err != nil {

deploy/README.md

@@ -0,0 +1,32 @@
+# Deploy demo webapp 
+
+Demo webapp manifests:
+- [common](webapp/common)
+- [frontend](webapp/frontend)
+- [backend](webapp/backend)
+
+Deploy the demo in `webapp` namespace:
+
+```bash
+kubectl apply -f ./webapp/common
+kubectl apply -f ./webapp/backend
+kubectl apply -f ./webapp/frontend
+```
+
+Deploy the demo in the `dev` namespace:
+
+```bash
+kustomize build ./overlays/dev | kubectl apply -f-
+```
+
+Deploy the demo in the `staging` namespace:
+
+```bash
+kustomize build ./overlays/staging | kubectl apply -f-
+```
+
+Deploy the demo in the `production` namespace:
+
+```bash
+kustomize build ./overlays/production | kubectl apply -f-
+```

deploy/bases/backend/deployment.yaml

@@ -0,0 +1,73 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backend
+spec:
+  minReadySeconds: 3
+  revisionHistoryLimit: 5
+  progressDeadlineSeconds: 60
+  strategy:
+    rollingUpdate:
+      maxUnavailable: 0
+    type: RollingUpdate
+  selector:
+    matchLabels:
+      app: backend
+  template:
+    metadata:
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9797"
+      labels:
+        app: backend
+    spec:
+      containers:
+      - name: backend
+        image: stefanprodan/podinfo:3.3.0
+        imagePullPolicy: IfNotPresent
+        ports:
+        - name: http
+          containerPort: 9898
+          protocol: TCP
+        - name: http-metrics
+          containerPort: 9797
+          protocol: TCP
+        - name: grpc
+          containerPort: 9999
+          protocol: TCP
+        command:
+        - ./podinfo
+        - --port=9898
+        - --port-metrics=9797
+        - --grpc-port=9999
+        - --grpc-service-name=backend
+        - --level=info
+        - --cache-server=cache:6379
+        env:
+        - name: PODINFO_UI_COLOR
+          value: "#34577c"
+        livenessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/healthz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        readinessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/readyz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        resources:
+          limits:
+            cpu: 2000m
+            memory: 512Mi
+          requests:
+            cpu: 100m
+            memory: 32Mi

deploy/bases/backend/hpa.yaml

@@ -0,0 +1,18 @@
+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: backend
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: backend
+  minReplicas: 1
+  maxReplicas: 2
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 99

deploy/bases/backend/kustomization.yaml

@@ -0,0 +1,7 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - service.yaml
+  - deployment.yaml
+  - hpa.yaml
+

deploy/bases/backend/service.yaml

@@ -0,0 +1,17 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: backend
+spec:
+  type: ClusterIP
+  selector:
+    app: backend
+  ports:
+    - name: http
+      port: 9898
+      protocol: TCP
+      targetPort: http
+    - port: 9999
+      targetPort: grpc
+      protocol: TCP
+      name: grpc

deploy/bases/cache/deployment.yaml

@@ -0,0 +1,57 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: cache
+spec:
+  selector:
+    matchLabels:
+      app: cache
+  template:
+    metadata:
+      labels:
+        app: cache
+    spec:
+      containers:
+        - name: redis
+          image: redis:6.0.1
+          imagePullPolicy: IfNotPresent
+          command:
+            - redis-server
+            - "/redis-master/redis.conf"
+          ports:
+            - name: redis
+              containerPort: 6379
+              protocol: TCP
+          livenessProbe:
+            tcpSocket:
+              port: redis
+            initialDelaySeconds: 5
+            timeoutSeconds: 5
+          readinessProbe:
+            exec:
+              command:
+                - redis-cli
+                - ping
+            initialDelaySeconds: 5
+            timeoutSeconds: 5
+          resources:
+            limits:
+              cpu: 1000m
+              memory: 128Mi
+            requests:
+              cpu: 100m
+              memory: 32Mi
+          volumeMounts:
+            - mountPath: /var/lib/redis
+              name: data
+            - mountPath: /redis-master
+              name: config
+      volumes:
+        - name: data
+          emptyDir: {}
+        - name: config
+          configMap:
+            name: redis-config
+            items:
+              - key: redis.conf
+                path: redis.conf

deploy/bases/cache/kustomization.yaml

@@ -0,0 +1,9 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - service.yaml
+  - deployment.yaml
+configMapGenerator:
+  - name: redis-config
+    files:
+      - redis.conf

deploy/bases/cache/redis.conf

@@ -0,0 +1,4 @@
+maxmemory 64mb
+maxmemory-policy allkeys-lru
+save ""
+appendonly no

deploy/bases/cache/service.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: cache
+spec:
+  type: ClusterIP
+  selector:
+    app: cache
+  ports:
+    - name: redis
+      port: 6379
+      protocol: TCP
+      targetPort: redis

deploy/bases/frontend/deployment.yaml

@@ -0,0 +1,72 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: frontend
+spec:
+  minReadySeconds: 3
+  revisionHistoryLimit: 5
+  progressDeadlineSeconds: 60
+  strategy:
+    rollingUpdate:
+      maxUnavailable: 0
+    type: RollingUpdate
+  selector:
+    matchLabels:
+      app: frontend
+  template:
+    metadata:
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9797"
+      labels:
+        app: frontend
+    spec:
+      containers:
+      - name: frontend
+        image: stefanprodan/podinfo:3.3.0
+        imagePullPolicy: IfNotPresent
+        ports:
+        - name: http
+          containerPort: 9898
+          protocol: TCP
+        - name: http-metrics
+          containerPort: 9797
+          protocol: TCP
+        - name: grpc
+          containerPort: 9999
+          protocol: TCP
+        command:
+        - ./podinfo
+        - --port=9898
+        - --port-metrics=9797
+        - --level=info
+        - --backend-url=http://backend:9898/echo
+        - --cache-server=cache:6379
+        env:
+        - name: PODINFO_UI_COLOR
+          value: "#34577c"
+        livenessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/healthz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        readinessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/readyz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        resources:
+          limits:
+            cpu: 1000m
+            memory: 128Mi
+          requests:
+            cpu: 100m
+            memory: 32Mi

deploy/bases/frontend/hpa.yaml

@@ -0,0 +1,18 @@
+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: frontend
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: frontend
+  minReplicas: 1
+  maxReplicas: 4
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 99

deploy/bases/frontend/kustomization.yaml

@@ -0,0 +1,7 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+resources:
+  - service.yaml
+  - deployment.yaml
+  - hpa.yaml
+

deploy/bases/frontend/service.yaml

@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: frontend
+spec:
+  type: ClusterIP
+  selector:
+    app: frontend
+  ports:
+    - name: http
+      port: 80
+      protocol: TCP
+      targetPort: http

deploy/overlays/dev/kustomization.yaml

@@ -0,0 +1,10 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: dev
+resources:
+  - ../../bases/backend
+  - ../../bases/frontend
+  - ../../bases/cache
+  - namespace.yaml
+transformers:
+  - labels.yaml

deploy/overlays/dev/labels.yaml

@@ -0,0 +1,10 @@
+apiVersion: builtin
+kind: LabelTransformer
+metadata:
+  name: labels
+labels:
+  env: dev
+  instance: webapp
+fieldSpecs:
+  - path: metadata/labels
+    create: true

deploy/overlays/dev/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: dev

deploy/overlays/production/kustomization.yaml

@@ -0,0 +1,10 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: production
+resources:
+  - ../../bases/backend
+  - ../../bases/frontend
+  - ../../bases/cache
+  - namespace.yaml
+transformers:
+  - labels.yaml

deploy/overlays/production/labels.yaml

@@ -0,0 +1,10 @@
+apiVersion: builtin
+kind: LabelTransformer
+metadata:
+  name: labels
+labels:
+  env: production
+  instance: webapp
+fieldSpecs:
+  - path: metadata/labels
+    create: true

deploy/overlays/production/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: production

deploy/overlays/staging/kustomization.yaml

@@ -0,0 +1,10 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: staging
+resources:
+  - ../../bases/backend
+  - ../../bases/frontend
+  - ../../bases/cache
+  - namespace.yaml
+transformers:
+  - labels.yaml

deploy/overlays/staging/labels.yaml

@@ -0,0 +1,10 @@
+apiVersion: builtin
+kind: LabelTransformer
+metadata:
+  name: labels
+labels:
+  env: staging
+  instance: webapp
+fieldSpecs:
+  - path: metadata/labels
+    create: true

deploy/overlays/staging/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: staging

deploy/webapp/backend/deployment.yaml

@@ -0,0 +1,74 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: backend
+  namespace: webapp
+spec:
+  minReadySeconds: 3
+  revisionHistoryLimit: 5
+  progressDeadlineSeconds: 60
+  strategy:
+    rollingUpdate:
+      maxUnavailable: 0
+    type: RollingUpdate
+  selector:
+    matchLabels:
+      app: backend
+  template:
+    metadata:
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9797"
+      labels:
+        app: backend
+    spec:
+      serviceAccountName: webapp
+      containers:
+      - name: backend
+        image: stefanprodan/podinfo:3.3.0
+        imagePullPolicy: IfNotPresent
+        ports:
+        - name: http
+          containerPort: 9898
+          protocol: TCP
+        - name: http-metrics
+          containerPort: 9797
+          protocol: TCP
+        - name: grpc
+          containerPort: 9999
+          protocol: TCP
+        command:
+        - ./podinfo
+        - --port=9898
+        - --port-metrics=9797
+        - --grpc-port=9999
+        - --grpc-service-name=backend
+        - --level=info
+        env:
+        - name: PODINFO_UI_COLOR
+          value: "#34577c"
+        livenessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/healthz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        readinessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/readyz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        resources:
+          limits:
+            cpu: 2000m
+            memory: 512Mi
+          requests:
+            cpu: 100m
+            memory: 32Mi

deploy/webapp/backend/hpa.yaml

@@ -0,0 +1,19 @@
+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: backend
+  namespace: webapp
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: backend
+  minReplicas: 1
+  maxReplicas: 2
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 99

deploy/webapp/backend/service.yaml

@@ -0,0 +1,18 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: backend
+  namespace: webapp
+spec:
+  type: ClusterIP
+  selector:
+    app: backend
+  ports:
+    - name: http
+      port: 9898
+      protocol: TCP
+      targetPort: http
+    - port: 9999
+      targetPort: grpc
+      protocol: TCP
+      name: grpc

deploy/webapp/common/namespace.yaml

@@ -0,0 +1,4 @@
+apiVersion: v1
+kind: Namespace
+metadata:
+  name: webapp

deploy/webapp/common/reconciler-rbac.yaml

@@ -0,0 +1,29 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: reconciler
+  namespace: webapp
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: Role
+metadata:
+  name: reconciler
+  namespace: webapp
+rules:
+  - apiGroups: ['*']
+    resources: ['*']
+    verbs: ['*']
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: RoleBinding
+metadata:
+  name: reconciler
+  namespace: webapp
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: Role
+  name: reconciler
+subjects:
+  - kind: ServiceAccount
+    name: reconciler
+    namespace: webapp

deploy/webapp/common/service-account.yaml

@@ -0,0 +1,5 @@
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  name: webapp
+  namespace: webapp

deploy/webapp/frontend/deployment.yaml

@@ -0,0 +1,73 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: frontend
+  namespace: webapp
+spec:
+  minReadySeconds: 3
+  revisionHistoryLimit: 5
+  progressDeadlineSeconds: 60
+  strategy:
+    rollingUpdate:
+      maxUnavailable: 0
+    type: RollingUpdate
+  selector:
+    matchLabels:
+      app: frontend
+  template:
+    metadata:
+      annotations:
+        prometheus.io/scrape: "true"
+        prometheus.io/port: "9797"
+      labels:
+        app: frontend
+    spec:
+      serviceAccountName: webapp
+      containers:
+      - name: frontend
+        image: stefanprodan/podinfo:3.3.0
+        imagePullPolicy: IfNotPresent
+        ports:
+        - name: http
+          containerPort: 9898
+          protocol: TCP
+        - name: http-metrics
+          containerPort: 9797
+          protocol: TCP
+        - name: grpc
+          containerPort: 9999
+          protocol: TCP
+        command:
+        - ./podinfo
+        - --port=9898
+        - --port-metrics=9797
+        - --level=info
+        - --backend-url=http://backend:9898/echo
+        env:
+        - name: PODINFO_UI_COLOR
+          value: "#34577c"
+        livenessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/healthz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        readinessProbe:
+          exec:
+            command:
+            - podcli
+            - check
+            - http
+            - localhost:9898/readyz
+          initialDelaySeconds: 5
+          timeoutSeconds: 5
+        resources:
+          limits:
+            cpu: 1000m
+            memory: 128Mi
+          requests:
+            cpu: 100m
+            memory: 32Mi

deploy/webapp/frontend/hpa.yaml

@@ -0,0 +1,19 @@
+apiVersion: autoscaling/v2beta2
+kind: HorizontalPodAutoscaler
+metadata:
+  name: frontend
+  namespace: webapp
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: backend
+  minReplicas: 1
+  maxReplicas: 4
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: 99

deploy/webapp/frontend/service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: frontend
+  namespace: webapp
+spec:
+  type: ClusterIP
+  selector:
+    app: frontend
+  ports:
+    - name: http
+      port: 80
+      protocol: TCP
+      targetPort: http

e2e/README.md

@@ -0,0 +1,35 @@
+# podinfo end-to-end testing
+
+The e2e testing infrastructure is powered by CircleCI and [Kubernetes Kind](https://github.com/kubernetes-sigs/kind).
+
+### CI workflow
+
+* download go modules
+* run unit tests
+* build container
+* install kubectl, Helm v3 and Kubernetes Kind CLIs
+* create local Kubernetes cluster with kind
+* load podinfo image onto the local cluster
+* deploy podinfo with Helm
+* set the podinfo image to the locally built one
+* run Helm tests
+
+```yaml
+jobs:
+  e2e-kubernetes:
+    machine: true
+    steps:
+      - checkout
+      - run:
+          name: Build podinfo container
+          command: e2e/build.sh
+      - run:
+          name: Start Kubernetes Kind cluster
+          command: e2e/bootstrap.sh
+      - run:
+          name: Install podinfo with Helm
+          command: e2e/install.sh
+      - run:
+          name: Run Helm tests
+          command: e2e/test.sh
+```

e2e/bootstrap.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+set -o errexit
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+KIND_VERSION=v0.7.0
+
+if [[ "$1" ]]; then
+  KIND_VERSION=$1
+fi
+
+echo ">>> Installing kubectl"
+curl -sLO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl && \
+chmod +x kubectl && \
+sudo mv kubectl /usr/local/bin/
+
+echo ">>> Installing kind"
+curl -sSLo kind "https://github.com/kubernetes-sigs/kind/releases/download/$KIND_VERSION/kind-linux-amd64"
+chmod +x kind
+sudo mv kind /usr/local/bin/kind
+
+echo ">>> Creating kind cluster"
+kind create cluster --wait 5m
+
+echo ">>> Installing Helm v3"
+curl https://raw.githubusercontent.com/helm/helm/master/scripts/get-helm-3 | bash

e2e/build.sh

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+
+set -o errexit
+
+docker build -t test/podinfo:latest .
+

e2e/install.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+set -o errexit
+
+REPO_ROOT=$(git rev-parse --show-toplevel)
+
+echo '>>> Loading image in Kind'
+kind load docker-image test/podinfo:latest
+
+echo '>>> Installing'
+helm upgrade -i podinfo ${REPO_ROOT}/charts/podinfo --namespace=default
+kubectl set image deployment/podinfo podinfo=test/podinfo:latest
+kubectl rollout status deployment/podinfo

e2e/test.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+set -o errexit
+
+function finish {
+  echo '>>> Test logs'
+  kubectl logs -l app=podinfo || true
+}
+trap "finish" EXIT SIGINT
+
+echo '>>> Start integration tests'
+helm test podinfo

go.mod

@@ -1,53 +1,27 @@
 module github.com/stefanprodan/podinfo
 
-go 1.12
+go 1.14
 
 require (
-	github.com/BurntSushi/toml v0.3.1 // indirect
-	github.com/aws/aws-sdk-go v1.15.63 // indirect
-	github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973 // indirect
-	github.com/bgentry/go-netrc v0.0.0-20140422174119-9fd32a8b3d3d // indirect
+	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751
 	github.com/chzyer/logex v1.1.10 // indirect
 	github.com/chzyer/readline v0.0.0-20160726135117-62c6fe619375
 	github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgrijalva/jwt-go v3.2.0+incompatible
 	github.com/fatih/color v1.7.0
 	github.com/fsnotify/fsnotify v1.4.7
-	github.com/golang/protobuf v1.2.0 // indirect
-	github.com/gorilla/mux v1.7.3
-	github.com/gorilla/websocket v1.4.0
-	github.com/hashicorp/go-cleanhttp v0.5.0 // indirect
-	github.com/hashicorp/go-getter v0.0.0-20180809191950-4bda8fa99001
-	github.com/hashicorp/go-safetemp v1.0.0 // indirect
-	github.com/hashicorp/go-version v1.0.0 // indirect
-	github.com/hashicorp/hcl v0.0.0-20180404174102-ef8a98b0bbce // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/magiconair/properties v1.8.0 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.4 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
-	github.com/mitchellh/go-homedir v1.0.0 // indirect
-	github.com/mitchellh/go-testing-interface v1.0.0 // indirect
-	github.com/mitchellh/mapstructure v0.0.0-20180715050151-f15292f7a699 // indirect
-	github.com/pelletier/go-toml v1.2.0 // indirect
-	github.com/pkg/errors v0.8.1 // indirect
-	github.com/prometheus/client_golang v0.8.0
-	github.com/prometheus/client_model v0.0.0-20180712105110-5c3871d89910 // indirect
-	github.com/prometheus/common v0.0.0-20180801064454-c7de2306084e // indirect
-	github.com/prometheus/procfs v0.0.0-20180725123919-05ee40e3a273 // indirect
-	github.com/spf13/afero v1.1.1 // indirect
-	github.com/spf13/cast v1.2.0 // indirect
-	github.com/spf13/cobra v0.0.3
-	github.com/spf13/jwalterweatherman v0.0.0-20180814060501-14d3d4c51834 // indirect
-	github.com/spf13/pflag v1.0.2
-	github.com/spf13/viper v1.1.0
-	github.com/stretchr/testify v1.3.0 // indirect
-	github.com/ulikunitz/xz v0.5.4 // indirect
-	go.uber.org/atomic v1.3.2 // indirect
-	go.uber.org/multierr v1.1.0 // indirect
-	go.uber.org/zap v1.9.1
-	golang.org/x/net v0.0.0-20190724013045-ca1201d0de80 // indirect
-	golang.org/x/sync v0.0.0-20190423024810-112230192c58 // indirect
-	gopkg.in/yaml.v2 v2.2.1 // indirect
+	github.com/go-chi/chi v4.1.1+incompatible // indirect
+	github.com/gomodule/redigo v1.8.1
+	github.com/gorilla/mux v1.7.4
+	github.com/gorilla/websocket v1.4.2
+	github.com/hashicorp/go-getter v1.4.1
+	github.com/prometheus/client_golang v1.5.1
+	github.com/spf13/cobra v1.0.0
+	github.com/spf13/pflag v1.0.5
+	github.com/spf13/viper v1.6.2
+	github.com/swaggo/http-swagger v0.0.0-20190614090009-c2865af9083e
+	github.com/swaggo/swag v1.6.5
+	go.uber.org/zap v1.15.0
+	golang.org/x/net v0.0.0-20190827160401-ba9fcec4b297
+	google.golang.org/grpc v1.23.0
 )

go.sum

@@ -1,107 +1,470 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1 h1:lRi0CHyU+ytlvylOlFKKq0af6JncuyoRh1J+QJBqQx0=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/aws/aws-sdk-go v1.15.63 h1:rPr7eEm/FSK23DoDKhbd9oLMYGT7JU9pkyfBUVOHXUo=
-github.com/aws/aws-sdk-go v1.15.63/go.mod h1:E3/ieXAlvM0XWO57iftYVDLLvQ824smPP3ATZkfNZeM=
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+github.com/KyleBanks/depth v1.2.1 h1:5h8fQADFrWtarTdtDudMmGsC7GPbOAu6RVB3ffsVFHc=
+github.com/KyleBanks/depth v1.2.1/go.mod h1:jzSb9d0L43HxTQfT+oSA1EEp2q+ne2uh6XgeJcm8brE=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/PuerkitoBio/purell v1.1.0 h1:rmGxhojJlM0tuKtfdvliR84CFHljx9ag64t2xmVkjK4=
+github.com/PuerkitoBio/purell v1.1.0/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
+github.com/PuerkitoBio/purell v1.1.1 h1:WEQqlqaGbrPkxLJWfBwQmfEAE1Z7ONdDLqrN38tNFfI=
+github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbtSwDGJws/X0=
+github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
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+google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.23.0 h1:AzbTB6ux+okLTzP8Ru1Xs41C303zdcfEht7MQnYJt5A=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/cheggaaa/pb.v1 v1.0.27/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
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+gopkg.in/ini.v1 v1.51.0 h1:AQvPpx3LzTDM0AjnIRlVFwFFGC+npRopjZxLJj6gdno=
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+gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1 h1:mUhvW9EsL+naU5Q3cakzfE91YhliOondGd6ZrsDBHQE=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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+honnef.co/go/tools v0.0.1-2019.2.3 h1:3JgtbtFHMiCmsznwGVTUWbgGov+pVqnlf1dEJTNAXeM=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=

kustomize/deployment.yaml

@@ -2,10 +2,8 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: podinfo
-  labels:
-    app: podinfo
 spec:
-  minReadySeconds: 5
+  minReadySeconds: 3
   revisionHistoryLimit: 5
   progressDeadlineSeconds: 60
   strategy:
@@ -19,26 +17,36 @@ spec:
     metadata:
       annotations:
         prometheus.io/scrape: "true"
+        prometheus.io/port: "9797"
       labels:
         app: podinfo
     spec:
       containers:
       - name: podinfod
-        image: quay.io/stefanprodan/podinfo:2.0.0
+        image: stefanprodan/podinfo:3.3.0
         imagePullPolicy: IfNotPresent
         ports:
-        - containerPort: 9898
-          name: http
+        - name: http
+          containerPort: 9898
+          protocol: TCP
+        - name: http-metrics
+          containerPort: 9797
+          protocol: TCP
+        - name: grpc
+          containerPort: 9999
           protocol: TCP
         command:
         - ./podinfo
         - --port=9898
+        - --port-metrics=9797
+        - --grpc-port=9999
+        - --grpc-service-name=podinfo
         - --level=info
         - --random-delay=false
         - --random-error=false
         env:
         - name: PODINFO_UI_COLOR
-          value: blue
+          value: "#34577c"
         livenessProbe:
           exec:
             command:

kustomize/kustomization.yaml

@@ -3,3 +3,5 @@ resources:
   - deployment.yaml
   - service.yaml
 
+commonLabels:
+  app: podinfo

kustomize/service.yaml

@@ -2,8 +2,6 @@ apiVersion: v1
 kind: Service
 metadata:
   name: podinfo
-  labels:
-    app: podinfo
 spec:
   type: ClusterIP
   selector:
@@ -13,3 +11,7 @@ spec:
       port: 9898
       protocol: TCP
       targetPort: http
+    - port: 9999
+      targetPort: grpc
+      protocol: TCP
+      name: grpc

pkg/api/cache.go

@@ -0,0 +1,93 @@
+package api
+
+import (
+	"github.com/gomodule/redigo/redis"
+	"github.com/gorilla/mux"
+	"go.uber.org/zap"
+	"io/ioutil"
+	"net/http"
+	"time"
+)
+
+// Cache godoc
+// @Summary Save payload in cache
+// @Description writes the posted content in cache and returns the SHA1 hash of the content
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /cache [post]
+// @Success 200 {object} api.MapResponse
+func (s *Server) cacheWriteHandler(w http.ResponseWriter, r *http.Request) {
+	if s.pool == nil {
+		s.ErrorResponse(w, r, "cache server is offline", http.StatusBadRequest)
+		return
+	}
+
+	body, err := ioutil.ReadAll(r.Body)
+	if err != nil {
+		s.ErrorResponse(w, r, "reading the request body failed", http.StatusBadRequest)
+		return
+	}
+
+	hash := hash(string(body))
+
+	conn := s.pool.Get()
+	defer conn.Close()
+	_, err = conn.Do("SET", hash, string(body))
+	if err != nil {
+		s.logger.Warn("cache set failed", zap.Error(err))
+		s.ErrorResponse(w, r, "cache set failed", http.StatusInternalServerError)
+		return
+	}
+	s.JSONResponseCode(w, r, map[string]string{"hash": hash}, http.StatusAccepted)
+}
+
+// Cache godoc
+// @Summary Get payload from cache
+// @Description returns the content from cache if key exists
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /cache/{hash} [get]
+// @Success 200 {string} api.MapResponse
+func (s *Server) cacheReadHandler(w http.ResponseWriter, r *http.Request) {
+	if s.pool == nil {
+		s.ErrorResponse(w, r, "cache server is offline", http.StatusBadRequest)
+		return
+	}
+
+	hash := mux.Vars(r)["hash"]
+	conn := s.pool.Get()
+	defer conn.Close()
+
+	ok, err := redis.Bool(conn.Do("EXISTS", hash))
+	if err != nil || !ok {
+		s.ErrorResponse(w, r, "key not found in cache", http.StatusNotFound)
+		return
+	}
+
+	data, err := redis.String(conn.Do("GET", hash))
+	if err != nil {
+		s.logger.Warn("cache get failed", zap.Error(err))
+		s.ErrorResponse(w, r, "cache get failed", http.StatusInternalServerError)
+		return
+	}
+
+	s.JSONResponseCode(w, r, map[string]string{"data": data}, http.StatusAccepted)
+}
+
+func (s *Server) startCachePool() {
+	if s.config.CacheServer != "" {
+		s.pool = &redis.Pool{
+			MaxIdle:     3,
+			IdleTimeout: 240 * time.Second,
+			Dial: func() (redis.Conn, error) {
+				return redis.Dial("tcp", s.config.CacheServer)
+			},
+			TestOnBorrow: func(c redis.Conn, t time.Time) error {
+				_, err := c.Do("PING")
+				return err
+			},
+		}
+	}
+}

pkg/api/chunked.go

@@ -9,6 +9,14 @@ import (
 	"github.com/gorilla/mux"
 )
 
+// Chunked godoc
+// @Summary Chunked transfer encoding
+// @Description uses transfer-encoding type chunked to give a partial response and then waits for the specified period
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /chunked/{seconds} [get]
+// @Success 200 {object} api.MapResponse
 func (s *Server) chunkedHandler(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 

pkg/api/delay.go

@@ -3,11 +3,20 @@ package api
 import (
 	"net/http"
 
-	"github.com/gorilla/mux"
 	"strconv"
 	"time"
+
+	"github.com/gorilla/mux"
 )
 
+// Delay godoc
+// @Summary Delay
+// @Description waits for the specified period
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /delay/{seconds} [get]
+// @Success 200 {object} api.MapResponse
 func (s *Server) delayHandler(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 

pkg/api/docs/docs.go

@@ -0,0 +1,646 @@
+// GENERATED BY THE COMMAND ABOVE; DO NOT EDIT
+// This file was generated by swaggo/swag at
+// 2020-05-16 09:49:23.920068 +0300 EEST m=+0.052088436
+
+package docs
+
+import (
+	"bytes"
+	"encoding/json"
+	"strings"
+
+	"github.com/alecthomas/template"
+	"github.com/swaggo/swag"
+)
+
+var doc = `{
+    "schemes": {{ marshal .Schemes }},
+    "swagger": "2.0",
+    "info": {
+        "description": "{{.Description}}",
+        "title": "{{.Title}}",
+        "contact": {
+            "name": "Source Code",
+            "url": "https://github.com/stefanprodan/podinfo"
+        },
+        "license": {
+            "name": "MIT License",
+            "url": "https://github.com/stefanprodan/podinfo/blob/master/LICENSE"
+        },
+        "version": "{{.Version}}"
+    },
+    "host": "{{.Host}}",
+    "basePath": "{{.BasePath}}",
+    "paths": {
+        "/": {
+            "get": {
+                "description": "renders podinfo UI",
+                "produces": [
+                    "text/html"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Index",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/api/echo": {
+            "post": {
+                "description": "forwards the call to the backend service and echos the posted content",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Echo",
+                "responses": {
+                    "202": {
+                        "description": "Accepted",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/api/info": {
+            "get": {
+                "description": "returns the runtime information",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Runtime information",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.RuntimeResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/cache": {
+            "post": {
+                "description": "writes the posted content in cache and returns the SHA1 hash of the content",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Save payload in cache",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/cache/{hash}": {
+            "get": {
+                "description": "returns the content from cache if key exists",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Get payload from cache",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/chunked/{seconds}": {
+            "get": {
+                "description": "uses transfer-encoding type chunked to give a partial response and then waits for the specified period",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Chunked transfer encoding",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/delay/{seconds}": {
+            "get": {
+                "description": "waits for the specified period",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Delay",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/env": {
+            "get": {
+                "description": "returns the environment variables as a JSON array",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Environment",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.ArrayResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/headers": {
+            "get": {
+                "description": "returns a JSON array with the request HTTP headers",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Headers",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.ArrayResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/healthz": {
+            "get": {
+                "description": "used by Kubernetes liveness probe",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Liveness check",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/metrics": {
+            "get": {
+                "description": "returns HTTP requests duration and Go runtime metrics",
+                "produces": [
+                    "text/plain"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Prometheus metrics",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/panic": {
+            "get": {
+                "description": "crashes the process with exit code 255",
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Panic"
+            }
+        },
+        "/readyz": {
+            "get": {
+                "description": "used by Kubernetes readiness probe",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Readiness check",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/readyz/disable": {
+            "post": {
+                "description": "signals the Kubernetes LB to stop sending requests to this instance",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Disable ready state",
+                "responses": {
+                    "202": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/readyz/enable": {
+            "post": {
+                "description": "signals the Kubernetes LB that this instance is ready to receive traffic",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Enable ready state",
+                "responses": {
+                    "202": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/status/{code}": {
+            "get": {
+                "description": "sets the response status code to the specified code",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Status code",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/store": {
+            "post": {
+                "description": "writes the posted content to disk at /data/hash and returns the SHA1 hash of the content",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Upload file",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/store/{hash}": {
+            "get": {
+                "description": "returns the content of the file /data/hash if exists",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "text/plain"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Download file",
+                "responses": {
+                    "200": {
+                        "description": "file",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/token": {
+            "post": {
+                "description": "issues a JWT token valid for one minute",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Generate JWT token",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.TokenResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/token/validate": {
+            "post": {
+                "description": "validates the JWT token",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Validate JWT token",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.TokenValidationResponse"
+                        }
+                    },
+                    "401": {
+                        "description": "Unauthorized",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/version": {
+            "get": {
+                "description": "returns podinfo version and git commit hash",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Version",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/ws/echo": {
+            "post": {
+                "description": "echos content via websockets",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Echo over websockets",
+                "responses": {
+                    "202": {
+                        "description": "Accepted",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        }
+    },
+    "definitions": {
+        "api.ArrayResponse": {
+            "type": "array",
+            "items": {
+                "type": "string"
+            }
+        },
+        "api.MapResponse": {
+            "type": "object",
+            "additionalProperties": {
+                "type": "string"
+            }
+        },
+        "api.RuntimeResponse": {
+            "type": "object",
+            "properties": {
+                "color": {
+                    "type": "string"
+                },
+                "goarch": {
+                    "type": "string"
+                },
+                "goos": {
+                    "type": "string"
+                },
+                "hostname": {
+                    "type": "string"
+                },
+                "logo": {
+                    "type": "string"
+                },
+                "message": {
+                    "type": "string"
+                },
+                "num_cpu": {
+                    "type": "string"
+                },
+                "num_goroutine": {
+                    "type": "string"
+                },
+                "revision": {
+                    "type": "string"
+                },
+                "runtime": {
+                    "type": "string"
+                },
+                "version": {
+                    "type": "string"
+                }
+            }
+        },
+        "api.TokenResponse": {
+            "type": "object",
+            "properties": {
+                "expires_at": {
+                    "type": "string"
+                },
+                "token": {
+                    "type": "string"
+                }
+            }
+        },
+        "api.TokenValidationResponse": {
+            "type": "object",
+            "properties": {
+                "expires_at": {
+                    "type": "string"
+                },
+                "token_name": {
+                    "type": "string"
+                }
+            }
+        }
+    }
+}`
+
+type swaggerInfo struct {
+	Version     string
+	Host        string
+	BasePath    string
+	Schemes     []string
+	Title       string
+	Description string
+}
+
+// SwaggerInfo holds exported Swagger Info so clients can modify it
+var SwaggerInfo = swaggerInfo{
+	Version:     "2.0",
+	Host:        "localhost:9898",
+	BasePath:    "/",
+	Schemes:     []string{"http", "https"},
+	Title:       "Podinfo API",
+	Description: "Go microservice template for Kubernetes.",
+}
+
+type s struct{}
+
+func (s *s) ReadDoc() string {
+	sInfo := SwaggerInfo
+	sInfo.Description = strings.Replace(sInfo.Description, "\n", "\\n", -1)
+
+	t, err := template.New("swagger_info").Funcs(template.FuncMap{
+		"marshal": func(v interface{}) string {
+			a, _ := json.Marshal(v)
+			return string(a)
+		},
+	}).Parse(doc)
+	if err != nil {
+		return doc
+	}
+
+	var tpl bytes.Buffer
+	if err := t.Execute(&tpl, sInfo); err != nil {
+		return doc
+	}
+
+	return tpl.String()
+}
+
+func init() {
+	swag.Register(swag.Name, &s{})
+}

pkg/api/docs/swagger.json

@@ -0,0 +1,587 @@
+{
+    "schemes": [
+        "http",
+        "https"
+    ],
+    "swagger": "2.0",
+    "info": {
+        "description": "Go microservice template for Kubernetes.",
+        "title": "Podinfo API",
+        "contact": {
+            "name": "Source Code",
+            "url": "https://github.com/stefanprodan/podinfo"
+        },
+        "license": {
+            "name": "MIT License",
+            "url": "https://github.com/stefanprodan/podinfo/blob/master/LICENSE"
+        },
+        "version": "2.0"
+    },
+    "host": "localhost:9898",
+    "basePath": "/",
+    "paths": {
+        "/": {
+            "get": {
+                "description": "renders podinfo UI",
+                "produces": [
+                    "text/html"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Index",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/api/echo": {
+            "post": {
+                "description": "forwards the call to the backend service and echos the posted content",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Echo",
+                "responses": {
+                    "202": {
+                        "description": "Accepted",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/api/info": {
+            "get": {
+                "description": "returns the runtime information",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Runtime information",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.RuntimeResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/cache": {
+            "post": {
+                "description": "writes the posted content in cache and returns the SHA1 hash of the content",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Save payload in cache",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/cache/{hash}": {
+            "get": {
+                "description": "returns the content from cache if key exists",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Get payload from cache",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/chunked/{seconds}": {
+            "get": {
+                "description": "uses transfer-encoding type chunked to give a partial response and then waits for the specified period",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Chunked transfer encoding",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/delay/{seconds}": {
+            "get": {
+                "description": "waits for the specified period",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Delay",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/env": {
+            "get": {
+                "description": "returns the environment variables as a JSON array",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Environment",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.ArrayResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/headers": {
+            "get": {
+                "description": "returns a JSON array with the request HTTP headers",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Headers",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.ArrayResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/healthz": {
+            "get": {
+                "description": "used by Kubernetes liveness probe",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Liveness check",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/metrics": {
+            "get": {
+                "description": "returns HTTP requests duration and Go runtime metrics",
+                "produces": [
+                    "text/plain"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Prometheus metrics",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/panic": {
+            "get": {
+                "description": "crashes the process with exit code 255",
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Panic"
+            }
+        },
+        "/readyz": {
+            "get": {
+                "description": "used by Kubernetes readiness probe",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Readiness check",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/readyz/disable": {
+            "post": {
+                "description": "signals the Kubernetes LB to stop sending requests to this instance",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Disable ready state",
+                "responses": {
+                    "202": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/readyz/enable": {
+            "post": {
+                "description": "signals the Kubernetes LB that this instance is ready to receive traffic",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "Kubernetes"
+                ],
+                "summary": "Enable ready state",
+                "responses": {
+                    "202": {
+                        "description": "OK",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/status/{code}": {
+            "get": {
+                "description": "sets the response status code to the specified code",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Status code",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/store": {
+            "post": {
+                "description": "writes the posted content to disk at /data/hash and returns the SHA1 hash of the content",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Upload file",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/store/{hash}": {
+            "get": {
+                "description": "returns the content of the file /data/hash if exists",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "text/plain"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Download file",
+                "responses": {
+                    "200": {
+                        "description": "file",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/token": {
+            "post": {
+                "description": "issues a JWT token valid for one minute",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Generate JWT token",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.TokenResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/token/validate": {
+            "post": {
+                "description": "validates the JWT token",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Validate JWT token",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.TokenValidationResponse"
+                        }
+                    },
+                    "401": {
+                        "description": "Unauthorized",
+                        "schema": {
+                            "type": "string"
+                        }
+                    }
+                }
+            }
+        },
+        "/version": {
+            "get": {
+                "description": "returns podinfo version and git commit hash",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Version",
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        },
+        "/ws/echo": {
+            "post": {
+                "description": "echos content via websockets",
+                "consumes": [
+                    "application/json"
+                ],
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "HTTP API"
+                ],
+                "summary": "Echo over websockets",
+                "responses": {
+                    "202": {
+                        "description": "Accepted",
+                        "schema": {
+                            "$ref": "#/definitions/api.MapResponse"
+                        }
+                    }
+                }
+            }
+        }
+    },
+    "definitions": {
+        "api.ArrayResponse": {
+            "type": "array",
+            "items": {
+                "type": "string"
+            }
+        },
+        "api.MapResponse": {
+            "type": "object",
+            "additionalProperties": {
+                "type": "string"
+            }
+        },
+        "api.RuntimeResponse": {
+            "type": "object",
+            "properties": {
+                "color": {
+                    "type": "string"
+                },
+                "goarch": {
+                    "type": "string"
+                },
+                "goos": {
+                    "type": "string"
+                },
+                "hostname": {
+                    "type": "string"
+                },
+                "logo": {
+                    "type": "string"
+                },
+                "message": {
+                    "type": "string"
+                },
+                "num_cpu": {
+                    "type": "string"
+                },
+                "num_goroutine": {
+                    "type": "string"
+                },
+                "revision": {
+                    "type": "string"
+                },
+                "runtime": {
+                    "type": "string"
+                },
+                "version": {
+                    "type": "string"
+                }
+            }
+        },
+        "api.TokenResponse": {
+            "type": "object",
+            "properties": {
+                "expires_at": {
+                    "type": "string"
+                },
+                "token": {
+                    "type": "string"
+                }
+            }
+        },
+        "api.TokenValidationResponse": {
+            "type": "object",
+            "properties": {
+                "expires_at": {
+                    "type": "string"
+                },
+                "token_name": {
+                    "type": "string"
+                }
+            }
+        }
+    }
+}

pkg/api/docs/swagger.yaml

@@ -0,0 +1,388 @@
+basePath: /
+definitions:
+  api.ArrayResponse:
+    items:
+      type: string
+    type: array
+  api.MapResponse:
+    additionalProperties:
+      type: string
+    type: object
+  api.RuntimeResponse:
+    properties:
+      color:
+        type: string
+      goarch:
+        type: string
+      goos:
+        type: string
+      hostname:
+        type: string
+      logo:
+        type: string
+      message:
+        type: string
+      num_cpu:
+        type: string
+      num_goroutine:
+        type: string
+      revision:
+        type: string
+      runtime:
+        type: string
+      version:
+        type: string
+    type: object
+  api.TokenResponse:
+    properties:
+      expires_at:
+        type: string
+      token:
+        type: string
+    type: object
+  api.TokenValidationResponse:
+    properties:
+      expires_at:
+        type: string
+      token_name:
+        type: string
+    type: object
+host: localhost:9898
+info:
+  contact:
+    name: Source Code
+    url: https://github.com/stefanprodan/podinfo
+  description: Go microservice template for Kubernetes.
+  license:
+    name: MIT License
+    url: https://github.com/stefanprodan/podinfo/blob/master/LICENSE
+  title: Podinfo API
+  version: "2.0"
+paths:
+  /:
+    get:
+      description: renders podinfo UI
+      produces:
+      - text/html
+      responses:
+        "200":
+          description: OK
+          schema:
+            type: string
+      summary: Index
+      tags:
+      - HTTP API
+  /api/echo:
+    post:
+      consumes:
+      - application/json
+      description: forwards the call to the backend service and echos the posted content
+      produces:
+      - application/json
+      responses:
+        "202":
+          description: Accepted
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Echo
+      tags:
+      - HTTP API
+  /api/info:
+    get:
+      consumes:
+      - application/json
+      description: returns the runtime information
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.RuntimeResponse'
+      summary: Runtime information
+      tags:
+      - HTTP API
+  /cache:
+    post:
+      consumes:
+      - application/json
+      description: writes the posted content in cache and returns the SHA1 hash of
+        the content
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Save payload in cache
+      tags:
+      - HTTP API
+  /cache/{hash}:
+    get:
+      consumes:
+      - application/json
+      description: returns the content from cache if key exists
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            type: string
+      summary: Get payload from cache
+      tags:
+      - HTTP API
+  /chunked/{seconds}:
+    get:
+      consumes:
+      - application/json
+      description: uses transfer-encoding type chunked to give a partial response
+        and then waits for the specified period
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Chunked transfer encoding
+      tags:
+      - HTTP API
+  /delay/{seconds}:
+    get:
+      consumes:
+      - application/json
+      description: waits for the specified period
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Delay
+      tags:
+      - HTTP API
+  /env:
+    get:
+      consumes:
+      - application/json
+      description: returns the environment variables as a JSON array
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.ArrayResponse'
+      summary: Environment
+      tags:
+      - HTTP API
+  /headers:
+    get:
+      consumes:
+      - application/json
+      description: returns a JSON array with the request HTTP headers
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.ArrayResponse'
+      summary: Headers
+      tags:
+      - HTTP API
+  /healthz:
+    get:
+      consumes:
+      - application/json
+      description: used by Kubernetes liveness probe
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            type: string
+      summary: Liveness check
+      tags:
+      - Kubernetes
+  /metrics:
+    get:
+      description: returns HTTP requests duration and Go runtime metrics
+      produces:
+      - text/plain
+      responses:
+        "200":
+          description: OK
+          schema:
+            type: string
+      summary: Prometheus metrics
+      tags:
+      - Kubernetes
+  /panic:
+    get:
+      description: crashes the process with exit code 255
+      summary: Panic
+      tags:
+      - HTTP API
+  /readyz:
+    get:
+      consumes:
+      - application/json
+      description: used by Kubernetes readiness probe
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            type: string
+      summary: Readiness check
+      tags:
+      - Kubernetes
+  /readyz/disable:
+    post:
+      consumes:
+      - application/json
+      description: signals the Kubernetes LB to stop sending requests to this instance
+      produces:
+      - application/json
+      responses:
+        "202":
+          description: OK
+          schema:
+            type: string
+      summary: Disable ready state
+      tags:
+      - Kubernetes
+  /readyz/enable:
+    post:
+      consumes:
+      - application/json
+      description: signals the Kubernetes LB that this instance is ready to receive
+        traffic
+      produces:
+      - application/json
+      responses:
+        "202":
+          description: OK
+          schema:
+            type: string
+      summary: Enable ready state
+      tags:
+      - Kubernetes
+  /status/{code}:
+    get:
+      consumes:
+      - application/json
+      description: sets the response status code to the specified code
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Status code
+      tags:
+      - HTTP API
+  /store:
+    post:
+      consumes:
+      - application/json
+      description: writes the posted content to disk at /data/hash and returns the
+        SHA1 hash of the content
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Upload file
+      tags:
+      - HTTP API
+  /store/{hash}:
+    get:
+      consumes:
+      - application/json
+      description: returns the content of the file /data/hash if exists
+      produces:
+      - text/plain
+      responses:
+        "200":
+          description: file
+          schema:
+            type: string
+      summary: Download file
+      tags:
+      - HTTP API
+  /token:
+    post:
+      consumes:
+      - application/json
+      description: issues a JWT token valid for one minute
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.TokenResponse'
+      summary: Generate JWT token
+      tags:
+      - HTTP API
+  /token/validate:
+    post:
+      consumes:
+      - application/json
+      description: validates the JWT token
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.TokenValidationResponse'
+        "401":
+          description: Unauthorized
+          schema:
+            type: string
+      summary: Validate JWT token
+      tags:
+      - HTTP API
+  /version:
+    get:
+      description: returns podinfo version and git commit hash
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Version
+      tags:
+      - HTTP API
+  /ws/echo:
+    post:
+      consumes:
+      - application/json
+      description: echos content via websockets
+      produces:
+      - application/json
+      responses:
+        "202":
+          description: Accepted
+          schema:
+            $ref: '#/definitions/api.MapResponse'
+      summary: Echo over websockets
+      tags:
+      - HTTP API
+schemes:
+- http
+- https
+swagger: "2.0"

pkg/api/echo.go

@@ -3,13 +3,23 @@ package api
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"io/ioutil"
 	"net/http"
+	"sync"
 
 	"github.com/stefanprodan/podinfo/pkg/version"
 	"go.uber.org/zap"
 )
 
+// Echo godoc
+// @Summary Echo
+// @Description forwards the call to the backend service and echos the posted content
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /api/echo [post]
+// @Success 202 {object} api.MapResponse
 func (s *Server) echoHandler(w http.ResponseWriter, r *http.Request) {
 	body, err := ioutil.ReadAll(r.Body)
 	if err != nil {
@@ -18,59 +28,68 @@ func (s *Server) echoHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	defer r.Body.Close()
-
 	if len(s.config.BackendURL) > 0 {
-		backendReq, err := http.NewRequest("POST", s.config.BackendURL, bytes.NewReader(body))
-		if err != nil {
-			s.logger.Error("backend call failed", zap.Error(err), zap.String("url", s.config.BackendURL))
-			s.ErrorResponse(w, r, "backend call failed", http.StatusInternalServerError)
-			return
+		result := make([]string, len(s.config.BackendURL))
+		var wg sync.WaitGroup
+		wg.Add(len(s.config.BackendURL))
+		for i, b := range s.config.BackendURL {
+			go func(index int, backend string) {
+				defer wg.Done()
+				backendReq, err := http.NewRequest("POST", backend, bytes.NewReader(body))
+				if err != nil {
+					s.logger.Error("backend call failed", zap.Error(err), zap.String("url", backend))
+					return
+				}
+
+				// forward headers
+				copyTracingHeaders(r, backendReq)
+
+				backendReq.Header.Set("X-API-Version", version.VERSION)
+				backendReq.Header.Set("X-API-Revision", version.REVISION)
+
+				ctx, cancel := context.WithTimeout(backendReq.Context(), s.config.HttpClientTimeout)
+				defer cancel()
+
+				// call backend
+				resp, err := http.DefaultClient.Do(backendReq.WithContext(ctx))
+				if err != nil {
+					s.logger.Error("backend call failed", zap.Error(err), zap.String("url", backend))
+					result[index] = fmt.Sprintf("backend %v call failed %v", backend, err)
+					return
+				}
+				defer resp.Body.Close()
+
+				// copy error status from backend and exit
+				if resp.StatusCode >= 400 {
+					s.logger.Error("backend call failed", zap.Int("status", resp.StatusCode), zap.String("url", backend))
+					result[index] = fmt.Sprintf("backend %v response status code %v", backend, resp.StatusCode)
+					return
+				}
+
+				// forward the received body
+				rbody, err := ioutil.ReadAll(resp.Body)
+				if err != nil {
+					s.logger.Error(
+						"reading the backend request body failed",
+						zap.Error(err),
+						zap.String("url", backend))
+					result[index] = fmt.Sprintf("backend %v call failed %v", backend, err)
+					return
+				}
+
+				s.logger.Debug(
+					"payload received from backend",
+					zap.String("response", string(rbody)),
+					zap.String("url", backend))
+
+				result[index] = string(rbody)
+			}(i, b)
 		}
-
-		// forward headers
-		copyTracingHeaders(r, backendReq)
-
-		backendReq.Header.Set("X-API-Version", version.VERSION)
-		backendReq.Header.Set("X-API-Revision", version.REVISION)
-
-		ctx, cancel := context.WithTimeout(backendReq.Context(), s.config.HttpClientTimeout)
-		defer cancel()
-
-		// call backend
-		resp, err := http.DefaultClient.Do(backendReq.WithContext(ctx))
-		if err != nil {
-			s.logger.Error("backend call failed", zap.Error(err), zap.String("url", s.config.BackendURL))
-			s.ErrorResponse(w, r, "backend call failed", http.StatusInternalServerError)
-			return
-		}
-
-		defer resp.Body.Close()
-
-		// copy error status from backend and exit
-		if resp.StatusCode >= 400 {
-			s.ErrorResponse(w, r, "backend error", resp.StatusCode)
-			return
-		}
-
-		// forward the received body
-		rbody, err := ioutil.ReadAll(resp.Body)
-		if err != nil {
-			s.logger.Error(
-				"reading the backend request body failed",
-				zap.Error(err),
-				zap.String("url", s.config.BackendURL))
-			s.ErrorResponse(w, r, "backend call failed", http.StatusInternalServerError)
-			return
-		}
-
-		s.logger.Debug(
-			"payload received from backend",
-			zap.String("response", string(rbody)),
-			zap.String("url", s.config.BackendURL))
+		wg.Wait()
 
 		w.Header().Set("X-Color", s.config.UIColor)
-		w.WriteHeader(http.StatusAccepted)
-		w.Write(rbody)
+		s.JSONResponse(w, r, result)
+
 	} else {
 		w.Header().Set("X-Color", s.config.UIColor)
 		w.WriteHeader(http.StatusAccepted)

pkg/api/echows.go

@@ -11,6 +11,14 @@ import (
 
 var wsCon = websocket.Upgrader{}
 
+// EchoWS godoc
+// @Summary Echo over websockets
+// @Description echos content via websockets
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /ws/echo [post]
+// @Success 202 {object} api.MapResponse
 // Test: go run ./cmd/podcli/* ws localhost:9898/ws/echo
 func (s *Server) echoWsHandler(w http.ResponseWriter, r *http.Request) {
 	c, err := wsCon.Upgrade(w, r, nil)

pkg/api/env.go

@@ -6,6 +6,14 @@ import (
 	"os"
 )
 
+// Env godoc
+// @Summary Environment
+// @Description returns the environment variables as a JSON array
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /env [get]
+// @Success 200 {object} api.ArrayResponse
 func (s *Server) envHandler(w http.ResponseWriter, r *http.Request) {
 	s.JSONResponse(w, r, os.Environ())
 }

pkg/api/headers.go

@@ -4,6 +4,14 @@ import (
 	"net/http"
 )
 
+// Headers godoc
+// @Summary Headers
+// @Description returns a JSON array with the request HTTP headers
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /headers [get]
+// @Success 200 {object} api.ArrayResponse
 func (s *Server) echoHeadersHandler(w http.ResponseWriter, r *http.Request) {
 	s.JSONResponse(w, r, r.Header)
 }

pkg/api/health.go

@@ -5,6 +5,14 @@ import (
 	"sync/atomic"
 )
 
+// Healthz godoc
+// @Summary Liveness check
+// @Description used by Kubernetes liveness probe
+// @Tags Kubernetes
+// @Accept json
+// @Produce json
+// @Router /healthz [get]
+// @Success 200 {string} string "OK"
 func (s *Server) healthzHandler(w http.ResponseWriter, r *http.Request) {
 	if atomic.LoadInt32(&healthy) == 1 {
 		s.JSONResponse(w, r, map[string]string{"status": "OK"})
@@ -13,6 +21,14 @@ func (s *Server) healthzHandler(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusServiceUnavailable)
 }
 
+// Readyz godoc
+// @Summary Readiness check
+// @Description used by Kubernetes readiness probe
+// @Tags Kubernetes
+// @Accept json
+// @Produce json
+// @Router /readyz [get]
+// @Success 200 {string} string "OK"
 func (s *Server) readyzHandler(w http.ResponseWriter, r *http.Request) {
 	if atomic.LoadInt32(&ready) == 1 {
 		s.JSONResponse(w, r, map[string]string{"status": "OK"})
@@ -21,11 +37,27 @@ func (s *Server) readyzHandler(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusServiceUnavailable)
 }
 
+// EnableReady godoc
+// @Summary Enable ready state
+// @Description signals the Kubernetes LB that this instance is ready to receive traffic
+// @Tags Kubernetes
+// @Accept json
+// @Produce json
+// @Router /readyz/enable [post]
+// @Success 202 {string} string "OK"
 func (s *Server) enableReadyHandler(w http.ResponseWriter, r *http.Request) {
 	atomic.StoreInt32(&ready, 1)
 	w.WriteHeader(http.StatusAccepted)
 }
 
+// DisableReady godoc
+// @Summary Disable ready state
+// @Description signals the Kubernetes LB to stop sending requests to this instance
+// @Tags Kubernetes
+// @Accept json
+// @Produce json
+// @Router /readyz/disable [post]
+// @Success 202 {string} string "OK"
 func (s *Server) disableReadyHandler(w http.ResponseWriter, r *http.Request) {
 	atomic.StoreInt32(&ready, 0)
 	w.WriteHeader(http.StatusAccepted)

pkg/api/index.go

@@ -6,6 +6,13 @@ import (
 	"path"
 )
 
+// Index godoc
+// @Summary Index
+// @Description renders podinfo UI
+// @Tags HTTP API
+// @Produce html
+// @Router / [get]
+// @Success 200 {string} string "OK"
 func (s *Server) indexHandler(w http.ResponseWriter, r *http.Request) {
 	tmpl, err := template.New("vue.html").ParseFiles(path.Join(s.config.UIPath, "vue.html"))
 	if err != nil {
@@ -16,8 +23,10 @@ func (s *Server) indexHandler(w http.ResponseWriter, r *http.Request) {
 
 	data := struct {
 		Title string
+		Logo  string
 	}{
 		Title: s.config.Hostname,
+		Logo:  s.config.UILogo,
 	}
 
 	if err := tmpl.Execute(w, data); err != nil {

pkg/api/info.go

@@ -9,22 +9,20 @@ import (
 	"github.com/stefanprodan/podinfo/pkg/version"
 )
 
+// Info godoc
+// @Summary Runtime information
+// @Description returns the runtime information
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Success 200 {object} api.RuntimeResponse
+// @Router /api/info [get]
 func (s *Server) infoHandler(w http.ResponseWriter, r *http.Request) {
-	data := struct {
-		Hostname     string `json:"hostname"`
-		Version      string `json:"version"`
-		Revision     string `json:"revision"`
-		Color        string `json:"color"`
-		Message      string `json:"message"`
-		GOOS         string `json:"goos"`
-		GOARCH       string `json:"goarch"`
-		Runtime      string `json:"runtime"`
-		NumGoroutine string `json:"num_goroutine"`
-		NumCPU       string `json:"num_cpu"`
-	}{
+	data := RuntimeResponse{
 		Hostname:     s.config.Hostname,
 		Version:      version.VERSION,
 		Revision:     version.REVISION,
+		Logo:         s.config.UILogo,
 		Color:        s.config.UIColor,
 		Message:      s.config.UIMessage,
 		GOOS:         runtime.GOOS,
@@ -36,3 +34,17 @@ func (s *Server) infoHandler(w http.ResponseWriter, r *http.Request) {
 
 	s.JSONResponse(w, r, data)
 }
+
+type RuntimeResponse struct {
+	Hostname     string `json:"hostname"`
+	Version      string `json:"version"`
+	Revision     string `json:"revision"`
+	Color        string `json:"color"`
+	Logo         string `json:"logo"`
+	Message      string `json:"message"`
+	GOOS         string `json:"goos"`
+	GOARCH       string `json:"goarch"`
+	Runtime      string `json:"runtime"`
+	NumGoroutine string `json:"num_goroutine"`
+	NumCPU       string `json:"num_cpu"`
+}

pkg/api/metrics.go

@@ -47,6 +47,13 @@ func NewPrometheusMiddleware() *PrometheusMiddleware {
 	}
 }
 
+// Metrics godoc
+// @Summary Prometheus metrics
+// @Description returns HTTP requests duration and Go runtime metrics
+// @Tags Kubernetes
+// @Produce plain
+// @Router /metrics [get]
+// @Success 200 {string} string "OK"
 func (p *PrometheusMiddleware) Handler(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		begin := time.Now()

pkg/api/mock.go

@@ -12,7 +12,7 @@ func NewMockServer() *Server {
 		Port:                      "9898",
 		HttpServerShutdownTimeout: 5 * time.Second,
 		HttpServerTimeout:         30 * time.Second,
-		BackendURL:                "",
+		BackendURL:                []string{},
 		ConfigPath:                "/config",
 		DataPath:                  "/data",
 		HttpClientTimeout:         30 * time.Second,

pkg/api/panic.go

@@ -4,6 +4,11 @@ import (
 	"net/http"
 )
 
+// Panic godoc
+// @Summary Panic
+// @Description crashes the process with exit code 255
+// @Tags HTTP API
+// @Router /panic [get]
 func (s *Server) panicHandler(w http.ResponseWriter, r *http.Request) {
 	s.logger.Panic("Panic command received")
 }

pkg/api/server.go

@@ -10,24 +10,50 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/gomodule/redigo/redis"
 	"github.com/gorilla/mux"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"github.com/spf13/viper"
+	_ "github.com/stefanprodan/podinfo/pkg/api/docs"
 	"github.com/stefanprodan/podinfo/pkg/fscache"
+	httpSwagger "github.com/swaggo/http-swagger"
+	"github.com/swaggo/swag"
 	"go.uber.org/zap"
+	"golang.org/x/net/http2"
+	"golang.org/x/net/http2/h2c"
 )
 
+// @title Podinfo API
+// @version 2.0
+// @description Go microservice template for Kubernetes.
+
+// @contact.name Source Code
+// @contact.url https://github.com/stefanprodan/podinfo
+
+// @license.name MIT License
+// @license.url https://github.com/stefanprodan/podinfo/blob/master/LICENSE
+
+// @host localhost:9898
+// @BasePath /
+// @schemes http https
+
 var (
 	healthy int32
 	ready   int32
 	watcher *fscache.Watcher
 )
 
+type FluxConfig struct {
+	GitUrl    string `mapstructure:"git-url"`
+	GitBranch string `mapstructure:"git-branch"`
+}
+
 type Config struct {
 	HttpClientTimeout         time.Duration `mapstructure:"http-client-timeout"`
 	HttpServerTimeout         time.Duration `mapstructure:"http-server-timeout"`
 	HttpServerShutdownTimeout time.Duration `mapstructure:"http-server-shutdown-timeout"`
-	BackendURL                string        `mapstructure:"backend-url"`
+	BackendURL                []string      `mapstructure:"backend-url"`
+	UILogo                    string        `mapstructure:"ui-logo"`
 	UIMessage                 string        `mapstructure:"ui-message"`
 	UIColor                   string        `mapstructure:"ui-color"`
 	UIPath                    string        `mapstructure:"ui-path"`
@@ -36,15 +62,20 @@ type Config struct {
 	Port                      string        `mapstructure:"port"`
 	PortMetrics               int           `mapstructure:"port-metrics"`
 	Hostname                  string        `mapstructure:"hostname"`
+	H2C                       bool          `mapstructure:"h2c"`
 	RandomDelay               bool          `mapstructure:"random-delay"`
 	RandomError               bool          `mapstructure:"random-error"`
+	Unhealthy                 bool          `mapstructure:"unhealthy"`
+	Unready                   bool          `mapstructure:"unready"`
 	JWTSecret                 string        `mapstructure:"jwt-secret"`
+	CacheServer               string        `mapstructure:"cache-server"`
 }
 
 type Server struct {
 	router *mux.Router
 	logger *zap.Logger
 	config *Config
+	pool   *redis.Pool
 }
 
 func NewServer(config *Config, logger *zap.Logger) (*Server, error) {
@@ -73,8 +104,10 @@ func (s *Server) registerHandlers() {
 	s.router.HandleFunc("/readyz/disable", s.disableReadyHandler).Methods("POST")
 	s.router.HandleFunc("/panic", s.panicHandler).Methods("GET")
 	s.router.HandleFunc("/status/{code:[0-9]+}", s.statusHandler).Methods("GET", "POST", "PUT").Name("status")
-	s.router.HandleFunc("/store", s.storeWriteHandler).Methods("POST")
+	s.router.HandleFunc("/store", s.storeWriteHandler).Methods("POST", "PUT")
 	s.router.HandleFunc("/store/{hash}", s.storeReadHandler).Methods("GET").Name("store")
+	s.router.HandleFunc("/cache", s.cacheWriteHandler).Methods("POST", "PUT")
+	s.router.HandleFunc("/cache/{hash}", s.cacheReadHandler).Methods("GET").Name("cache")
 	s.router.HandleFunc("/configs", s.configReadHandler).Methods("GET")
 	s.router.HandleFunc("/token", s.tokenGenerateHandler).Methods("POST")
 	s.router.HandleFunc("/token/validate", s.tokenValidateHandler).Methods("GET")
@@ -83,6 +116,19 @@ func (s *Server) registerHandlers() {
 	s.router.HandleFunc("/ws/echo", s.echoWsHandler)
 	s.router.HandleFunc("/chunked", s.chunkedHandler)
 	s.router.HandleFunc("/chunked/{wait:[0-9]+}", s.chunkedHandler)
+	s.router.PathPrefix("/swagger/").Handler(httpSwagger.Handler(
+		httpSwagger.URL("/swagger/doc.json"),
+	))
+	s.router.PathPrefix("/swagger/").Handler(httpSwagger.Handler(
+		httpSwagger.URL("/swagger/doc.json"),
+	))
+	s.router.HandleFunc("/swagger.json", func(w http.ResponseWriter, r *http.Request) {
+		doc, err := swag.ReadDoc()
+		if err != nil {
+			s.logger.Error("swagger error", zap.Error(err), zap.String("path", "/swagger.json"))
+		}
+		w.Write([]byte(doc))
+	})
 }
 
 func (s *Server) registerMiddlewares() {
@@ -105,12 +151,19 @@ func (s *Server) ListenAndServe(stopCh <-chan struct{}) {
 	s.registerHandlers()
 	s.registerMiddlewares()
 
+	var handler http.Handler
+	if s.config.H2C {
+		handler = h2c.NewHandler(s.router, &http2.Server{})
+	} else {
+		handler = s.router
+	}
+
 	srv := &http.Server{
 		Addr:         ":" + s.config.Port,
 		WriteTimeout: s.config.HttpServerTimeout,
 		ReadTimeout:  s.config.HttpServerTimeout,
 		IdleTimeout:  2 * s.config.HttpServerTimeout,
-		Handler:      s.router,
+		Handler:      handler,
 	}
 
 	//s.printRoutes()
@@ -126,6 +179,27 @@ func (s *Server) ListenAndServe(stopCh <-chan struct{}) {
 		}
 	}
 
+	// start redis connection pool
+	s.startCachePool()
+	if s.pool != nil {
+		ticker := time.NewTicker(30 * time.Second)
+		go func() {
+			for {
+				select {
+				case <-stopCh:
+					return
+				case <-ticker.C:
+					conn := s.pool.Get()
+					_, err := redis.String(conn.Do("PING"))
+					if err != nil {
+						s.logger.Warn("cache server is offline", zap.Error(err), zap.String("server", s.config.CacheServer))
+					}
+					_ = conn.Close()
+				}
+			}
+		}()
+	}
+
 	// run server in background
 	go func() {
 		if err := srv.ListenAndServe(); err != http.ErrServerClosed {
@@ -134,8 +208,12 @@ func (s *Server) ListenAndServe(stopCh <-chan struct{}) {
 	}()
 
 	// signal Kubernetes the server is ready to receive traffic
-	atomic.StoreInt32(&healthy, 1)
-	atomic.StoreInt32(&ready, 1)
+	if !s.config.Unhealthy {
+		atomic.StoreInt32(&healthy, 1)
+	}
+	if !s.config.Unready {
+		atomic.StoreInt32(&ready, 1)
+	}
 
 	// wait for SIGTERM or SIGINT
 	<-stopCh
@@ -146,6 +224,11 @@ func (s *Server) ListenAndServe(stopCh <-chan struct{}) {
 	atomic.StoreInt32(&healthy, 0)
 	atomic.StoreInt32(&ready, 0)
 
+	// close cache pool
+	if s.pool != nil {
+		_ = s.pool.Close()
+	}
+
 	s.logger.Info("Shutting down HTTP server", zap.Duration("timeout", s.config.HttpServerShutdownTimeout))
 
 	// wait for Kubernetes readiness probe to remove this instance from the load balancer
@@ -206,3 +289,6 @@ func (s *Server) printRoutes() {
 		return nil
 	})
 }
+
+type ArrayResponse []string
+type MapResponse map[string]string

pkg/api/status.go

@@ -3,10 +3,19 @@ package api
 import (
 	"net/http"
 
-	"github.com/gorilla/mux"
 	"strconv"
+
+	"github.com/gorilla/mux"
 )
 
+// Status godoc
+// @Summary Status code
+// @Description sets the response status code to the specified code
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /status/{code} [get]
+// @Success 200 {object} api.MapResponse
 func (s *Server) statusHandler(w http.ResponseWriter, r *http.Request) {
 	vars := mux.Vars(r)
 

pkg/api/store.go

@@ -11,6 +11,14 @@ import (
 	"go.uber.org/zap"
 )
 
+// Store godoc
+// @Summary Upload file
+// @Description writes the posted content to disk at /data/hash and returns the SHA1 hash of the content
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /store [post]
+// @Success 200 {object} api.MapResponse
 func (s *Server) storeWriteHandler(w http.ResponseWriter, r *http.Request) {
 
 	body, err := ioutil.ReadAll(r.Body)
@@ -29,6 +37,14 @@ func (s *Server) storeWriteHandler(w http.ResponseWriter, r *http.Request) {
 	s.JSONResponseCode(w, r, map[string]string{"hash": hash}, http.StatusAccepted)
 }
 
+// Store godoc
+// @Summary Download file
+// @Description returns the content of the file /data/hash if exists
+// @Tags HTTP API
+// @Accept json
+// @Produce plain
+// @Router /store/{hash} [get]
+// @Success 200 {string} string "file"
 func (s *Server) storeReadHandler(w http.ResponseWriter, r *http.Request) {
 	hash := mux.Vars(r)["hash"]
 	content, err := ioutil.ReadFile(path.Join(s.config.DataPath, hash))

pkg/api/token.go

@@ -17,6 +17,14 @@ type jwtCustomClaims struct {
 	jwt.StandardClaims
 }
 
+// Token godoc
+// @Summary Generate JWT token
+// @Description issues a JWT token valid for one minute
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /token [post]
+// @Success 200 {object} api.TokenResponse
 func (s *Server) tokenGenerateHandler(w http.ResponseWriter, r *http.Request) {
 	body, err := ioutil.ReadAll(r.Body)
 	if err != nil {
@@ -46,10 +54,7 @@ func (s *Server) tokenGenerateHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	var result = struct {
-		Token     string    `json:"token"`
-		ExpiresAt time.Time `json:"expires_at"`
-	}{
+	var result = TokenResponse{
 		Token:     t,
 		ExpiresAt: time.Unix(claims.StandardClaims.ExpiresAt, 0),
 	}
@@ -57,6 +62,15 @@ func (s *Server) tokenGenerateHandler(w http.ResponseWriter, r *http.Request) {
 	s.JSONResponse(w, r, result)
 }
 
+// TokenValidate godoc
+// @Summary Validate JWT token
+// @Description validates the JWT token
+// @Tags HTTP API
+// @Accept json
+// @Produce json
+// @Router /token/validate [post]
+// @Success 200 {object} api.TokenValidationResponse
+// @Failure 401 {string} string "Unauthorized"
 // Get: JWT=$(curl -s -d 'test' localhost:9898/token | jq -r .token)
 // Post: curl -H "Authorization: Bearer ${JWT}" localhost:9898/token/validate
 func (s *Server) tokenValidateHandler(w http.ResponseWriter, r *http.Request) {
@@ -87,10 +101,7 @@ func (s *Server) tokenValidateHandler(w http.ResponseWriter, r *http.Request) {
 		if claims.StandardClaims.Issuer != "podinfo" {
 			s.ErrorResponse(w, r, "invalid issuer", http.StatusUnauthorized)
 		} else {
-			var result = struct {
-				TokenName string    `json:"token_name"`
-				ExpiresAt time.Time `json:"expires_at"`
-			}{
+			var result = TokenValidationResponse{
 				TokenName: claims.Name,
 				ExpiresAt: time.Unix(claims.StandardClaims.ExpiresAt, 0),
 			}
@@ -100,3 +111,13 @@ func (s *Server) tokenValidateHandler(w http.ResponseWriter, r *http.Request) {
 		s.ErrorResponse(w, r, "Invalid authorization token", http.StatusUnauthorized)
 	}
 }
+
+type TokenResponse struct {
+	Token     string    `json:"token"`
+	ExpiresAt time.Time `json:"expires_at"`
+}
+
+type TokenValidationResponse struct {
+	TokenName string    `json:"token_name"`
+	ExpiresAt time.Time `json:"expires_at"`
+}

pkg/api/version.go

@@ -6,6 +6,13 @@ import (
 	"github.com/stefanprodan/podinfo/pkg/version"
 )
 
+// Version godoc
+// @Summary Version
+// @Description returns podinfo version and git commit hash
+// @Tags HTTP API
+// @Produce json
+// @Router /version [get]
+// @Success 200 {object} api.MapResponse
 func (s *Server) versionHandler(w http.ResponseWriter, r *http.Request) {
 	result := map[string]string{
 		"version": version.VERSION,

pkg/grpc/server.go

@@ -0,0 +1,46 @@
+package grpc
+
+import (
+	"fmt"
+	"net"
+
+	"go.uber.org/zap"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/health"
+	"google.golang.org/grpc/health/grpc_health_v1"
+)
+
+type Server struct {
+	logger *zap.Logger
+	config *Config
+}
+
+type Config struct {
+	Port        int    `mapstructure:"grpc-port"`
+	ServiceName string `mapstructure:"grpc-service-name"`
+}
+
+func NewServer(config *Config, logger *zap.Logger) (*Server, error) {
+	srv := &Server{
+		logger: logger,
+		config: config,
+	}
+
+	return srv, nil
+}
+
+func (s *Server) ListenAndServe() {
+	listener, err := net.Listen("tcp", fmt.Sprintf(":%v", s.config.Port))
+	if err != nil {
+		s.logger.Fatal("failed to listen", zap.Int("port", s.config.Port))
+	}
+
+	srv := grpc.NewServer()
+	server := health.NewServer()
+	grpc_health_v1.RegisterHealthServer(srv, server)
+	server.SetServingStatus(s.config.ServiceName, grpc_health_v1.HealthCheckResponse_SERVING)
+
+	if err := srv.Serve(listener); err != nil {
+		s.logger.Fatal("failed to serve", zap.Error(err))
+	}
+}

pkg/version/version.go

@@ -1,4 +1,4 @@
 package version
 
-var VERSION = "2.0.0"
+var VERSION = "3.3.0"
 var REVISION = "unknown"

ui/vue.html

@@ -10,8 +10,11 @@
   <link href="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.min.css" rel="stylesheet">
   <style>
 	[v-cloak] {
-  		display: none;
-	}
+    display: none;
+  }
+  .v-application .v-parallax {
+    height: 100vh !important;
+  }
   </style>
 </head>
 <body>
@@ -19,14 +22,14 @@
    <v-app dark>
     <v-content>
       <section>
-        <v-parallax id="parallax-hero" src="#" :class="info.color">
+        <v-parallax id="parallax-hero" :style="cuddleStyle" src="https://upload.wikimedia.org/wikipedia/commons/c/ca/1x1.png">
           <v-layout
             column
             align-center
             justify-center
             class="white--text"
           >
-            <img src="https://d33wubrfki0l68.cloudfront.net/33a12d8be0bc50be4738443101616e968c7afb8f/cba76/images/scalable.png" alt="kubernetes" height="200">
+            <img :src="info.logo" height="350">
             <h1 class="white--text mb-2 display-1 text-xs-center">${ info.message }</h1>
             <div class="subheading mb-3 text-xs-center">Served by <b>${ info.hostname }</b></div>
             <v-btn
@@ -59,6 +62,7 @@
               Powered
               by <a class="white--text" href="https://github.com/stefanprodan/podinfo" target="_blank">podinfo</a>
               version ${ info.version } revision ${ info.revision }
+              Swagger <a class="white--text" href="swagger/">docs</a>
             </div>
           </v-flex>
         </v-layout>
@@ -85,20 +89,20 @@
         tlColor1: 'grey',
         tlName2: '',
         tlColor2: 'grey',
+        cuddleStyle: {
+            backgroundColor: '#34577c'
+        },
     }
     },
-    mounted: function() {
-       document.getElementById('parallax-hero').style.height = '100vh'
-    },
     created: function() {
         this.getInfo();
         this.timer = setInterval(this.getInfo, 3000)
     },
     methods: {
         getInfo: function() {
-            var xhr = new XMLHttpRequest()
-            var self = this
-            xhr.open('GET', "api/info")
+          const xhr = new XMLHttpRequest();
+          let self = this;
+          xhr.open('GET', "api/info")
             xhr.onload = function () {
                 data = JSON.parse(xhr.responseText)
                 if (self.info.version) {
@@ -107,22 +111,22 @@
                     }
                 }
                 self.info = data
-                self.info.color = parseInt(data.version.split('.').reverse()[0], 10) === 0
-                  ? 'blue'
-                  : 'green'
+                self.info.color = data.color
+                self.cuddleStyle = {
+                    backgroundColor: data.color
+                }
+                self.info.logo = data.logo
                 document.title = data.hostname
-
-                if ((self.calls % 2) === 0) {
-                  self.tlColor1 = parseInt(data.version.split('.').reverse()[0], 10) === 0
-                          ? 'blue'
-                          : 'green'
-                  self.tlColor2 = 'grey'
-                  self.tlName1 = data.version
-                } else {
-                self.tlColor1 = 'grey'
-                self.tlColor2 = parseInt(data.version.split('.').reverse()[0], 10) === 0
+                let verColor = (parseInt(data.version.split('.').reverse()[0], 10)  % 2 === 0)
                         ? 'blue'
                         : 'green'
+                if ((self.calls % 2) === 0) {
+                  self.tlColor2 += ' lighten-2'
+                  self.tlColor1 = verColor
+                  self.tlName1 = data.version
+                } else {
+                  self.tlColor1 += ' lighten-2'
+                self.tlColor2 = verColor
                 self.tlName2 = data.version
               }
               self.calls++