| // 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" |
| |
| "github.com/coreos/etcd/clientv3" |
| |
| grpcprom "github.com/grpc-ecosystem/go-grpc-prometheus" |
| "github.com/prometheus/client_golang/prometheus/promhttp" |
| "google.golang.org/grpc" |
| ) |
| |
| func ExampleClient_metrics() { |
| cli, err := clientv3.New(clientv3.Config{ |
| Endpoints: endpoints, |
| 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 |
| } |