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// Copyright 2016 The etcd Authors
//
// 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.
package clientv3_test
import (
"context"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"strings"
"go.etcd.io/etcd/client/v3"
grpcprom "github.com/grpc-ecosystem/go-grpc-prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"google.golang.org/grpc"
)
func mockClient_metrics() {
fmt.Println(`grpc_client_started_total{grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"} 1`)
}
func ExampleClient_metrics() {
forUnitTestsRunInMockedContext(mockClient_metrics, func() {
cli, err := clientv3.New(clientv3.Config{
Endpoints: exampleEndpoints(),
DialOptions: []grpc.DialOption{
grpc.WithUnaryInterceptor(grpcprom.UnaryClientInterceptor),
grpc.WithStreamInterceptor(grpcprom.StreamClientInterceptor),
},
})
if err != nil {
log.Fatal(err)
}
defer cli.Close()
// get a key so it shows up in the metrics as a range RPC
cli.Get(context.TODO(), "test_key")
// listen for all Prometheus metrics
ln, err := net.Listen("tcp", ":0")
if err != nil {
log.Fatal(err)
}
donec := make(chan struct{})
go func() {
defer close(donec)
http.Serve(ln, promhttp.Handler())
}()
defer func() {
ln.Close()
<-donec
}()
// make an http request to fetch all Prometheus metrics
url := "http://" + ln.Addr().String() + "/metrics"
resp, err := http.Get(url)
if err != nil {
log.Fatalf("fetch error: %v", err)
}
b, err := ioutil.ReadAll(resp.Body)
resp.Body.Close()
if err != nil {
log.Fatalf("fetch error: reading %s: %v", url, err)
}
// confirm range request in metrics
for _, l := range strings.Split(string(b), "\n") {
if strings.Contains(l, `grpc_client_started_total{grpc_method="Range"`) {
fmt.Println(l)
break
}
}
})
// Output:
// grpc_client_started_total{grpc_method="Range",grpc_service="etcdserverpb.KV",grpc_type="unary"} 1
}
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