Add --unhealthy and --unready flags

Depending on the flag set, the healthy or ready state is never
reached.

Makefile

@@ -8,11 +8,12 @@ DOCKER_REPOSITORY:=stefanprodan
 DOCKER_IMAGE_NAME:=$(DOCKER_REPOSITORY)/$(NAME)
 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 -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 --ui-color=#34577c
+	--ui-logo=https://raw.githubusercontent.com/stefanprodan/podinfo/gh-pages/cuddle_clap.gif --ui-color=#34577c $(EXTRA_RUN_ARGS)
 
 test:
 	GO111MODULE=on go test -v -race ./...

cmd/podinfo/main.go

@@ -42,6 +42,8 @@ func main() {
 	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.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")
 

pkg/api/server.go

@@ -65,6 +65,8 @@ type Config struct {
 	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"`
 }
 
@@ -181,8 +183,12 @@ 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