1/*
2 *
3 * Copyright 2016 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *     http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19// Binary metrics_client is a client to retrieve metrics from the server.
20package main
21
22import (
23	"context"
24	"flag"
25	"fmt"
26	"io"
27
28	"google.golang.org/grpc"
29	"google.golang.org/grpc/grpclog"
30	metricspb "google.golang.org/grpc/stress/grpc_testing"
31)
32
33var (
34	metricsServerAddress = flag.String("metrics_server_address", "", "The metrics server addresses in the format <hostname>:<port>")
35	totalOnly            = flag.Bool("total_only", false, "If true, this prints only the total value of all gauges")
36
37	logger = grpclog.Component("stress")
38)
39
40func printMetrics(client metricspb.MetricsServiceClient, totalOnly bool) {
41	stream, err := client.GetAllGauges(context.Background(), &metricspb.EmptyMessage{})
42	if err != nil {
43		logger.Fatalf("failed to call GetAllGauges: %v", err)
44	}
45
46	var (
47		overallQPS int64
48		rpcStatus  error
49	)
50	for {
51		gaugeResponse, err := stream.Recv()
52		if err != nil {
53			rpcStatus = err
54			break
55		}
56		if _, ok := gaugeResponse.GetValue().(*metricspb.GaugeResponse_LongValue); !ok {
57			panic(fmt.Sprintf("gauge %s is not a long value", gaugeResponse.Name))
58		}
59		v := gaugeResponse.GetLongValue()
60		if !totalOnly {
61			logger.Infof("%s: %d", gaugeResponse.Name, v)
62		}
63		overallQPS += v
64	}
65	if rpcStatus != io.EOF {
66		logger.Fatalf("failed to finish server streaming: %v", rpcStatus)
67	}
68	logger.Infof("overall qps: %d", overallQPS)
69}
70
71func main() {
72	flag.Parse()
73	if *metricsServerAddress == "" {
74		logger.Fatalf("Metrics server address is empty.")
75	}
76
77	conn, err := grpc.Dial(*metricsServerAddress, grpc.WithInsecure())
78	if err != nil {
79		logger.Fatalf("cannot connect to metrics server: %v", err)
80	}
81	defer conn.Close()
82
83	c := metricspb.NewMetricsServiceClient(conn)
84	printMetrics(c, *totalOnly)
85}
86