mirror of
https://github.com/etcd-io/etcd.git
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2a151c8982
The io/ioutil package has been deprecated as of Go 1.16, see https://golang.org/doc/go1.16#ioutil. This commit replaces the existing io/ioutil functions with their new definitions in io and os packages. Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>
92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
// Copyright 2016 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package clientv3_test
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import (
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"context"
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"fmt"
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"io"
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"log"
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"net"
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"net/http"
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"strings"
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"go.etcd.io/etcd/client/v3"
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grpcprom "github.com/grpc-ecosystem/go-grpc-prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"google.golang.org/grpc"
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)
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func mockClient_metrics() {
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fmt.Println(`grpc_client_started_total{grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"} 1`)
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}
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func ExampleClient_metrics() {
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forUnitTestsRunInMockedContext(mockClient_metrics, func() {
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cli, err := clientv3.New(clientv3.Config{
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Endpoints: exampleEndpoints(),
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DialOptions: []grpc.DialOption{
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grpc.WithUnaryInterceptor(grpcprom.UnaryClientInterceptor),
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grpc.WithStreamInterceptor(grpcprom.StreamClientInterceptor),
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},
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})
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if err != nil {
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log.Fatal(err)
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}
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defer cli.Close()
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// get a key so it shows up in the metrics as a range RPC
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cli.Get(context.TODO(), "test_key")
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// listen for all Prometheus metrics
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ln, err := net.Listen("tcp", ":0")
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if err != nil {
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log.Fatal(err)
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}
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donec := make(chan struct{})
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go func() {
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defer close(donec)
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http.Serve(ln, promhttp.Handler())
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}()
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defer func() {
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ln.Close()
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<-donec
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}()
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// make an http request to fetch all Prometheus metrics
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url := "http://" + ln.Addr().String() + "/metrics"
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resp, err := http.Get(url)
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if err != nil {
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log.Fatalf("fetch error: %v", err)
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}
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b, err := io.ReadAll(resp.Body)
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resp.Body.Close()
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if err != nil {
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log.Fatalf("fetch error: reading %s: %v", url, err)
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}
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// confirm range request in metrics
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for _, l := range strings.Split(string(b), "\n") {
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if strings.Contains(l, `grpc_client_started_total{grpc_method="Range"`) {
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fmt.Println(l)
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break
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}
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}
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})
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// Output:
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// grpc_client_started_total{grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"} 1
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}
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