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Update weaveworks/common to latest version

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```
$ gvt delete github.com/weaveworks/common
$ gvt fetch --revision 4d96fd8dcf2c7b417912c6219b310112cb4a4626 github.com/weaveworks/common
2018/07/23 15:31:11 Fetching: github.com/weaveworks/common
2018/07/23 15:31:14 · Skipping (existing): github.com/golang/protobuf/ptypes/any
2018/07/23 15:31:14 · Fetching recursive dependency: github.com/pkg/errors
2018/07/23 15:31:16 · Skipping (existing): github.com/aws/aws-sdk-go/aws
2018/07/23 15:31:16 · Fetching recursive dependency: github.com/sirupsen/logrus
2018/07/23 15:31:18 ·· Skipping (existing): golang.org/x/sys/unix
2018/07/23 15:31:18 ·· Skipping (existing): golang.org/x/crypto/ssh/terminal
2018/07/23 15:31:18 · Skipping (existing): google.golang.org/grpc/status
2018/07/23 15:31:18 · Skipping (existing): github.com/gorilla/mux
2018/07/23 15:31:18 · Fetching recursive dependency: github.com/opentracing-contrib/go-stdlib/nethttp
2018/07/23 15:31:20 ·· Skipping (existing): github.com/opentracing/opentracing-go/ext
2018/07/23 15:31:20 ·· Skipping (existing): github.com/opentracing/opentracing-go/log
2018/07/23 15:31:20 ·· Skipping (existing): github.com/opentracing/opentracing-go
2018/07/23 15:31:20 · Skipping (existing): github.com/prometheus/client_golang/prometheus
2018/07/23 15:31:20 · Skipping (existing): google.golang.org/grpc
2018/07/23 15:31:20 · Skipping (existing): github.com/pmezard/go-difflib/difflib
2018/07/23 15:31:20 · Fetching recursive dependency: github.com/go-kit/kit/log
2018/07/23 15:31:23 ·· Fetching recursive dependency: github.com/go-logfmt/logfmt
2018/07/23 15:31:25 ··· Fetching recursive dependency: github.com/kr/logfmt
2018/07/23 15:31:27 ·· Fetching recursive dependency: github.com/go-stack/stack
2018/07/23 15:31:29 · Fetching recursive dependency: google.golang.org/genproto/googleapis/rpc/status
2018/07/23 15:31:37 ·· Skipping (existing): github.com/golang/protobuf/proto
2018/07/23 15:31:37 ·· Skipping (existing): github.com/golang/protobuf/ptypes/any
2018/07/23 15:31:37 · Skipping (existing): github.com/opentracing/opentracing-go/log
2018/07/23 15:31:37 · Fetching recursive dependency: github.com/sercand/kuberesolver
2018/07/23 15:31:39 ·· Skipping (existing): google.golang.org/grpc/grpclog
2018/07/23 15:31:39 ·· Skipping (existing): google.golang.org/grpc/resolver
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2018/07/23 15:31:39 · Skipping (existing): github.com/opentracing/opentracing-go/ext
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2018/07/23 15:31:39 · Skipping (existing): github.com/golang/protobuf/ptypes
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2018/07/23 15:31:39 · Fetching recursive dependency: github.com/grpc-ecosystem/grpc-opentracing/go/otgrpc
2018/07/23 15:31:41 ·· Skipping (existing): github.com/opentracing/opentracing-go/log
2018/07/23 15:31:41 ·· Skipping (existing): golang.org/x/net/context
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2018/07/23 15:31:41 ·· Skipping (existing): github.com/golang/protobuf/proto
2018/07/23 15:31:41 ·· Skipping (existing): github.com/opentracing/opentracing-go
2018/07/23 15:31:41 ·· Skipping (existing): github.com/opentracing/opentracing-go/ext
2018/07/23 15:31:41 ·· Skipping (existing): google.golang.org/grpc
2018/07/23 15:31:41 ·· Skipping (existing): google.golang.org/grpc/metadata
2018/07/23 15:31:41 ·· Skipping (existing): google.golang.org/grpc/status
2018/07/23 15:31:41 · Fetching recursive dependency: github.com/uber/jaeger-client-go/config
2018/07/23 15:31:44 ·· Fetching recursive dependency: github.com/uber/jaeger-client-go/internal/throttler/remote
2018/07/23 15:31:44 ··· Fetching recursive dependency: github.com/uber/jaeger-client-go/utils
2018/07/23 15:31:44 ···· Fetching recursive dependency: github.com/uber/jaeger-client-go/thrift
2018/07/23 15:31:44 ···· Fetching recursive dependency: github.com/uber/jaeger-client-go/thrift-gen/agent
2018/07/23 15:31:44 ····· Fetching recursive dependency: github.com/uber/jaeger-client-go/thrift-gen/jaeger
2018/07/23 15:31:44 ····· Fetching recursive dependency: github.com/uber/jaeger-client-go/thrift-gen/zipkincore
2018/07/23 15:31:44 ··· Fetching recursive dependency: github.com/uber/jaeger-client-go
2018/07/23 15:31:44 ···· Fetching recursive dependency: github.com/crossdock/crossdock-go
2018/07/23 15:31:46 ····· Skipping (existing): github.com/davecgh/go-spew/spew
2018/07/23 15:31:46 ····· Skipping (existing): golang.org/x/net/context/ctxhttp
2018/07/23 15:31:46 ····· Skipping (existing): golang.org/x/net/context
2018/07/23 15:31:46 ····· Skipping (existing): github.com/pmezard/go-difflib/difflib
2018/07/23 15:31:46 ···· Skipping (existing): github.com/opentracing/opentracing-go/log
2018/07/23 15:31:46 ···· Fetching recursive dependency: go.uber.org/zap/zapcore
2018/07/23 15:31:49 ····· Fetching recursive dependency: go.uber.org/atomic
2018/07/23 15:31:51 ····· Fetching recursive dependency: go.uber.org/zap/internal/bufferpool
2018/07/23 15:31:51 ······ Fetching recursive dependency: go.uber.org/zap/buffer
2018/07/23 15:31:51 ····· Fetching recursive dependency: go.uber.org/multierr
2018/07/23 15:31:54 ····· Fetching recursive dependency: go.uber.org/zap/internal/exit
2018/07/23 15:31:54 ····· Fetching recursive dependency: go.uber.org/zap/internal/color
2018/07/23 15:31:54 ···· Fetching recursive dependency: go.uber.org/zap
2018/07/23 15:31:54 ···· Skipping (existing): github.com/opentracing/opentracing-go
2018/07/23 15:31:54 ···· Skipping (existing): github.com/opentracing/opentracing-go/ext
2018/07/23 15:31:54 ···· Fetching recursive dependency: github.com/uber/jaeger-lib/metrics
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2018/07/23 15:31:58 ······ Fetching recursive dependency: github.com/m3db/prometheus_client_golang/prometheus/promhttp
2018/07/23 15:32:00 ······· Skipping (existing): github.com/prometheus/client_golang/prometheus
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2018/07/23 15:32:00 ······· Skipping (existing): github.com/prometheus/client_model/go
2018/07/23 15:32:00 ······ Fetching recursive dependency: gopkg.in/validator.v2
2018/07/23 15:32:06 ······ Fetching recursive dependency: github.com/cactus/go-statsd-client/statsd
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2018/07/23 15:32:08 ······ Fetching recursive dependency: github.com/m3db/prometheus_client_golang/prometheus
2018/07/23 15:32:08 ······· Skipping (existing): github.com/prometheus/procfs
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2018/07/23 15:32:08 ······· Skipping (existing): github.com/prometheus/common/expfmt
2018/07/23 15:32:08 ······· Skipping (existing): golang.org/x/net/context
2018/07/23 15:32:08 ······· Skipping (existing): github.com/beorn7/perks/quantile
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2018/07/23 15:32:08 ······· Skipping (existing): github.com/prometheus/common/model
2018/07/23 15:32:08 ······· Skipping (existing): github.com/prometheus/client_golang/prometheus
2018/07/23 15:32:08 ······ Fetching recursive dependency: github.com/apache/thrift/lib/go/thrift
2018/07/23 15:32:13 ····· Skipping (existing): github.com/stretchr/testify/assert
2018/07/23 15:32:13 ····· Fetching recursive dependency: github.com/go-kit/kit/metrics/influx
2018/07/23 15:32:13 ······ Fetching recursive dependency: github.com/influxdata/influxdb/client/v2
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2018/07/23 15:32:17 ······ Fetching recursive dependency: github.com/go-kit/kit/metrics
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2018/07/23 15:32:28 ········· Fetching recursive dependency: github.com/aws/aws-sdk-go-v2/internal/awsutil
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2018/07/23 15:32:29 ······· Skipping (existing): github.com/aws/aws-sdk-go/service/cloudwatch/cloudwatchiface
2018/07/23 15:32:29 ······· Fetching recursive dependency: golang.org/x/sync/errgroup
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2018/07/23 15:32:31 ······· Fetching recursive dependency: github.com/VividCortex/gohistogram
2018/07/23 15:32:33 ····· Skipping (existing): github.com/prometheus/client_golang/prometheus
2018/07/23 15:32:33 ····· Fetching recursive dependency: github.com/codahale/hdrhistogram
2018/07/23 15:32:35 ·· Skipping (existing): github.com/opentracing/opentracing-go
2018/07/23 15:32:35 · Fetching recursive dependency: github.com/mwitkow/go-grpc-middleware
2018/07/23 15:32:37 ·· Fetching recursive dependency: github.com/grpc-ecosystem/go-grpc-middleware/logging
2018/07/23 15:32:39 ··· Fetching recursive dependency: github.com/grpc-ecosystem/go-grpc-middleware
2018/07/23 15:32:39 ···· Fetching recursive dependency: github.com/golang/protobuf/jsonpb
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2018/07/23 15:32:42 ····· Skipping (existing): github.com/golang/protobuf/proto
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2018/07/23 15:32:42 ····· Skipping (existing): github.com/golang/protobuf/ptypes/any
2018/07/23 15:32:42 ····· Skipping (existing): github.com/golang/protobuf/ptypes/struct
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2018/07/23 15:32:42 ···· Skipping (existing): google.golang.org/grpc/metadata
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2018/07/23 15:32:48 ···· Skipping (existing): github.com/golang/protobuf/proto
2018/07/23 15:32:48 ···· Skipping (existing): google.golang.org/grpc/grpclog
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2018/07/23 15:32:48 ·· Skipping (existing): google.golang.org/grpc/peer
2018/07/23 15:32:48 ·· Skipping (existing): google.golang.org/grpc/credentials
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2018/07/23 15:32:48 ·· Skipping (existing): golang.org/x/net/trace
2018/07/23 15:32:48 ·· Skipping (existing): github.com/opentracing/opentracing-go/ext
2018/07/23 15:32:48 · Fetching recursive dependency: github.com/weaveworks/promrus
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2018/07/23 15:32:53 ·· Skipping (existing): golang.org/x/net/context/ctxhttp
2018/07/23 15:32:53 ·· Fetching recursive dependency: github.com/stretchr/objx
2018/07/23 15:32:55 ·· Fetching recursive dependency: gopkg.in/alecthomas/kingpin.v2
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2018/07/23 15:33:02 ·· Fetching recursive dependency: github.com/julienschmidt/httprouter
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2018/07/23 15:33:05 · Skipping (existing): golang.org/x/tools/cover
2018/07/23 15:33:05 · Skipping (existing): github.com/mgutz/ansi
```
This commit is contained in:
Marc Carré
2018-07-23 15:33:58 +02:00
parent 0153f016d3
commit 652cc90f98
1466 changed files with 394515 additions and 359 deletions
Download Patch File Download Diff File Expand all files Collapse all files

202
vendor/github.com/sercand/kuberesolver/LICENSE generated vendored Normal file
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@@ -0,0 +1,202 @@
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identification within third-party archives.
Copyright 2017 Sercan Degirmenci
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

255
vendor/github.com/sercand/kuberesolver/builder.go generated vendored Normal file
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package kuberesolver
import (
"fmt"
"io"
"net"
"strconv"
"strings"
"sync"
"time"
"golang.org/x/net/context"
"google.golang.org/grpc/grpclog"
"google.golang.org/grpc/resolver"
)
const (
kubernetesSchema = "kubernetes"
defaultFreq = time.Minute * 30
)
type targetInfo struct {
serviceName string
serviceNamespace string
port string
resolveByPortName bool
useFirstPort bool
}
// RegisterInCluster registers the kuberesolver builder to grpc
func RegisterInCluster() {
RegisterInClusterWithSchema(kubernetesSchema)
}
func RegisterInClusterWithSchema(schema string) {
resolver.Register(NewBuilder(nil, schema))
}
// NewBuilder creates a kubeBuilder which is used to factory Kuberesolvers.
func NewBuilder(client K8sClient, schema string) resolver.Builder {
return &kubeBuilder{
k8sClient: client,
schema: schema,
}
}
type kubeBuilder struct {
k8sClient K8sClient
schema string
}
func parseResolverTarget(target resolver.Target) (targetInfo, error) {
// kubernetes://default/service:port
end := target.Endpoint
snamespace := target.Authority
// kubernetes://service.default:port/
if end == "" {
end = target.Authority
snamespace = "default"
}
// kubernetes:///service:port
// kubernetes://service:port/
if snamespace == "" {
snamespace = "default"
}
ti := targetInfo{}
if end == "" {
return targetInfo{}, fmt.Errorf("target(%q) is empty", target)
}
var name string
var port string
if strings.LastIndex(end, ":") < 0 {
name = end
port = ""
ti.useFirstPort = true
} else {
var err error
name, port, err = net.SplitHostPort(end)
if err != nil {
return targetInfo{}, fmt.Errorf("target endpoint='%s' is invalid. grpc target is %#v, err=%v", end, target, err)
}
}
namesplit := strings.SplitN(name, ".", 2)
sname := name
if len(namesplit) == 2 {
sname = namesplit[0]
snamespace = namesplit[1]
}
ti.serviceName = sname
ti.serviceNamespace = snamespace
ti.port = port
if !ti.useFirstPort {
if _, err := strconv.Atoi(ti.port); err != nil {
ti.resolveByPortName = true
} else {
ti.resolveByPortName = false
}
}
return ti, nil
}
// Build creates a new resolver for the given target.
//
// gRPC dial calls Build synchronously, and fails if the returned error is
// not nil.
func (b *kubeBuilder) Build(target resolver.Target, cc resolver.ClientConn, opts resolver.BuildOption) (resolver.Resolver, error) {
if b.k8sClient == nil {
if cl, err := NewInClusterK8sClient(); err == nil {
b.k8sClient = cl
} else {
return nil, err
}
}
ti, err := parseResolverTarget(target)
if err != nil {
return nil, err
}
ctx, cancel := context.WithCancel(context.Background())
r := &kResolver{
target: ti,
ctx: ctx,
cancel: cancel,
cc: cc,
rn: make(chan struct{}, 1),
k8sClient: b.k8sClient,
t: time.NewTimer(defaultFreq),
freq: defaultFreq,
}
go until(func() {
r.wg.Add(1)
err := r.watch()
if err != nil && err != io.EOF {
grpclog.Errorf("kuberesolver: watching ended with error='%v', will reconnect again", err)
}
}, time.Second, ctx.Done())
return r, nil
}
// Scheme returns the scheme supported by this resolver.
// Scheme is defined at https://github.com/grpc/grpc/blob/master/doc/naming.md.
func (b *kubeBuilder) Scheme() string {
return b.schema
}
type kResolver struct {
target targetInfo
ctx context.Context
cancel context.CancelFunc
cc resolver.ClientConn
// rn channel is used by ResolveNow() to force an immediate resolution of the target.
rn chan struct{}
k8sClient K8sClient
// wg is used to enforce Close() to return after the watcher() goroutine has finished.
wg sync.WaitGroup
t *time.Timer
freq time.Duration
}
// ResolveNow will be called by gRPC to try to resolve the target name again.
// It's just a hint, resolver can ignore this if it's not necessary.
func (k *kResolver) ResolveNow(resolver.ResolveNowOption) {
select {
case k.rn <- struct{}{}:
default:
}
}
// Close closes the resolver.
func (k *kResolver) Close() {
k.cancel()
k.wg.Wait()
}
func (k *kResolver) makeAddresses(e Endpoints) ([]resolver.Address, string) {
var newAddrs []resolver.Address
for _, subset := range e.Subsets {
port := ""
if k.target.useFirstPort {
port = strconv.Itoa(subset.Ports[0].Port)
} else if k.target.resolveByPortName {
for _, p := range subset.Ports {
if p.Name == k.target.port {
port = strconv.Itoa(p.Port)
break
}
}
} else {
port = k.target.port
}
if len(port) == 0 {
port = strconv.Itoa(subset.Ports[0].Port)
}
for _, address := range subset.Addresses {
sname := k.target.serviceName
if address.TargetRef != nil {
sname = address.TargetRef.Name
}
newAddrs = append(newAddrs, resolver.Address{
Type: resolver.Backend,
Addr: net.JoinHostPort(address.IP, port),
ServerName: sname,
Metadata: nil,
})
}
}
return newAddrs, ""
}
func (k *kResolver) handle(e Endpoints) {
result, _ := k.makeAddresses(e)
// k.cc.NewServiceConfig(sc)
if len(result) > 0 {
k.cc.NewAddress(result)
}
}
func (k *kResolver) resolve() {
e, err := getEndpoints(k.k8sClient, k.target.serviceNamespace, k.target.serviceName)
if err == nil {
k.handle(e)
} else {
grpclog.Errorf("kuberesolver: lookup endpoints failed: %v", err)
}
// Next lookup should happen after an interval defined by k.freq.
k.t.Reset(k.freq)
}
func (k *kResolver) watch() error {
defer k.wg.Done()
// watch endpoints lists existing endpoints at start
sw, err := watchEndpoints(k.k8sClient, k.target.serviceNamespace, k.target.serviceName)
if err != nil {
return err
}
for {
select {
case <-k.ctx.Done():
return nil
case <-k.t.C:
k.resolve()
case <-k.rn:
k.resolve()
case up, hasMore := <-sw.ResultChan():
if hasMore {
k.handle(up.Object)
} else {
return nil
}
}
}
}

137
vendor/github.com/sercand/kuberesolver/kubernetes.go generated vendored Normal file
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package kuberesolver
import (
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/url"
"os"
"strings"
"time"
)
const (
serviceAccountToken = "/var/run/secrets/kubernetes.io/serviceaccount/token"
serviceAccountCACert = "/var/run/secrets/kubernetes.io/serviceaccount/ca.crt"
)
// K8sClient is minimal kubernetes client interface
type K8sClient interface {
Do(req *http.Request) (*http.Response, error)
GetRequest(url string) (*http.Request, error)
Host() string
}
type k8sClient struct {
host string
token string
httpClient *http.Client
}
func (kc *k8sClient) GetRequest(url string) (*http.Request, error) {
if !strings.HasPrefix(url, kc.host) {
url = fmt.Sprintf("%s/%s", kc.host, url)
}
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
if len(kc.token) > 0 {
req.Header.Set("Authorization", "Bearer "+kc.token)
}
return req, nil
}
func (kc *k8sClient) Do(req *http.Request) (*http.Response, error) {
return kc.httpClient.Do(req)
}
func (kc *k8sClient) Host() string {
return kc.host
}
// NewInClusterK8sClient creates K8sClient if it is inside Kubernetes
func NewInClusterK8sClient() (K8sClient, error) {
host, port := os.Getenv("KUBERNETES_SERVICE_HOST"), os.Getenv("KUBERNETES_SERVICE_PORT")
if len(host) == 0 || len(port) == 0 {
return nil, fmt.Errorf("unable to load in-cluster configuration, KUBERNETES_SERVICE_HOST and KUBERNETES_SERVICE_PORT must be defined")
}
token, err := ioutil.ReadFile(serviceAccountToken)
if err != nil {
return nil, err
}
ca, err := ioutil.ReadFile(serviceAccountCACert)
if err != nil {
return nil, err
}
certPool := x509.NewCertPool()
certPool.AppendCertsFromPEM(ca)
transport := &http.Transport{TLSClientConfig: &tls.Config{
MinVersion: tls.VersionTLS10,
RootCAs: certPool,
}}
httpClient := &http.Client{Transport: transport, Timeout: time.Nanosecond * 0}
return &k8sClient{
host: "https://" + net.JoinHostPort(host, port),
token: string(token),
httpClient: httpClient,
}, nil
}
// NewInsecureK8sClient creates an insecure k8s client which is suitable
// to connect kubernetes api behind proxy
func NewInsecureK8sClient(apiURL string) K8sClient {
return &k8sClient{
host: apiURL,
httpClient: http.DefaultClient,
}
}
func getEndpoints(client K8sClient, namespace, targetName string) (Endpoints, error) {
u, err := url.Parse(fmt.Sprintf("%s/api/v1/namespaces/%s/endpoints/%s",
client.Host(), namespace, targetName))
if err != nil {
return Endpoints{}, err
}
req, err := client.GetRequest(u.String())
if err != nil {
return Endpoints{}, err
}
resp, err := client.Do(req)
if err != nil {
return Endpoints{}, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
return Endpoints{}, fmt.Errorf("invalid response code %d", resp.StatusCode)
}
result := Endpoints{}
err = json.NewDecoder(resp.Body).Decode(&result)
return result, err
}
func watchEndpoints(client K8sClient, namespace, targetName string) (watchInterface, error) {
u, err := url.Parse(fmt.Sprintf("%s/api/v1/watch/namespaces/%s/endpoints/%s",
client.Host(), namespace, targetName))
if err != nil {
return nil, err
}
req, err := client.GetRequest(u.String())
if err != nil {
return nil, err
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode != http.StatusOK {
defer resp.Body.Close()
return nil, fmt.Errorf("invalid response code %d", resp.StatusCode)
}
return newStreamWatcher(resp.Body), nil
}

50
vendor/github.com/sercand/kuberesolver/models.go generated vendored Normal file
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package kuberesolver
type EventType string
const (
Added EventType = "ADDED"
Modified EventType = "MODIFIED"
Deleted EventType = "DELETED"
Error EventType = "ERROR"
)
// Event represents a single event to a watched resource.
type Event struct {
Type EventType `json:"type"`
Object Endpoints `json:"object"`
}
type Endpoints struct {
Kind string `json:"kind"`
ApiVersion string `json:"apiVersion"`
Metadata Metadata `json:"metadata"`
Subsets []Subset `json:"subsets"`
}
type Metadata struct {
Name string `json:"name"`
Namespace string `json:"namespace"`
ResourceVersion string `json:"resourceVersion"`
Labels map[string]string `json:"labels"`
}
type Subset struct {
Addresses []Address `json:"addresses"`
Ports []Port `json:"ports"`
}
type Address struct {
IP string `json:"ip"`
TargetRef *ObjectReference `json:"targetRef,omitempty"`
}
type ObjectReference struct {
Kind string `json:"kind"`
Name string `json:"name"`
Namespace string `json:"namespace"`
}
type Port struct {
Name string `json:"name"`
Port int `json:"port"`
}

105
vendor/github.com/sercand/kuberesolver/stream.go generated vendored Normal file
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package kuberesolver
import (
"encoding/json"
"fmt"
"io"
"sync"
"google.golang.org/grpc/grpclog"
)
// Interface can be implemented by anything that knows how to watch and report changes.
type watchInterface interface {
// Stops watching. Will close the channel returned by ResultChan(). Releases
// any resources used by the watch.
Stop()
// Returns a chan which will receive all the events. If an error occurs
// or Stop() is called, this channel will be closed, in which case the
// watch should be completely cleaned up.
ResultChan() <-chan Event
}
// StreamWatcher turns any stream for which you can write a Decoder interface
// into a watch.Interface.
type streamWatcher struct {
result chan Event
r io.ReadCloser
decoder *json.Decoder
sync.Mutex
stopped bool
}
// NewStreamWatcher creates a StreamWatcher from the given io.ReadClosers.
func newStreamWatcher(r io.ReadCloser) watchInterface {
sw := &streamWatcher{
r: r,
decoder: json.NewDecoder(r),
result: make(chan Event),
}
go sw.receive()
return sw
}
// ResultChan implements Interface.
func (sw *streamWatcher) ResultChan() <-chan Event {
return sw.result
}
// Stop implements Interface.
func (sw *streamWatcher) Stop() {
sw.Lock()
defer sw.Unlock()
if !sw.stopped {
sw.stopped = true
sw.r.Close()
}
}
// stopping returns true if Stop() was called previously.
func (sw *streamWatcher) stopping() bool {
sw.Lock()
defer sw.Unlock()
return sw.stopped
}
// receive reads result from the decoder in a loop and sends down the result channel.
func (sw *streamWatcher) receive() {
defer close(sw.result)
defer sw.Stop()
for {
obj, err := sw.Decode()
if err != nil {
// Ignore expected error.
if sw.stopping() {
return
}
switch err {
case io.EOF:
// watch closed normally
case io.ErrUnexpectedEOF:
grpclog.Infof("kuberesolver: Unexpected EOF during watch stream event decoding: %v", err)
default:
grpclog.Infof("kuberesolver: Unable to decode an event from the watch stream: %v", err)
}
return
}
sw.result <- obj
}
}
// Decode blocks until it can return the next object in the writer. Returns an error
// if the writer is closed or an object can't be decoded.
func (sw *streamWatcher) Decode() (Event, error) {
var got Event
if err := sw.decoder.Decode(&got); err != nil {
return Event{}, err
}
switch got.Type {
case Added, Modified, Deleted, Error:
return got, nil
default:
return Event{}, fmt.Errorf("got invalid watch event type: %v", got.Type)
}
}

35
vendor/github.com/sercand/kuberesolver/util.go generated vendored Normal file
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package kuberesolver
import (
"runtime/debug"
"time"
"google.golang.org/grpc/grpclog"
)
func until(f func(), period time.Duration, stopCh <-chan struct{}) {
select {
case <-stopCh:
return
default:
}
for {
func() {
defer handleCrash()
f()
}()
select {
case <-stopCh:
return
case <-time.After(period):
}
}
}
// HandleCrash simply catches a crash and logs an error. Meant to be called via defer.
func handleCrash() {
if r := recover(); r != nil {
callers := string(debug.Stack())
grpclog.Errorf("kuberesolver: recovered from panic: %#v (%v)\n%v", r, r, callers)
}
}