From 13acad85b3c151e66790d0e6b8572d9b1f63c8fc Mon Sep 17 00:00:00 2001
From: sinsharat <sinsharat@gmail.com>
Date: Thu, 3 Nov 2016 00:11:50 +0530
Subject: [PATCH] clientv3: added test for client metrics

---
 clientv3/integration/metrics_test.go | 169 +++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 clientv3/integration/metrics_test.go

diff --git a/clientv3/integration/metrics_test.go b/clientv3/integration/metrics_test.go
new file mode 100644
index 00000000000..317d81e6724
--- /dev/null
+++ b/clientv3/integration/metrics_test.go
@@ -0,0 +1,169 @@
+// 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 integration
+
+import (
+	"bufio"
+	"io"
+	"net"
+	"net/http"
+	"strconv"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/coreos/etcd/clientv3"
+	"github.com/coreos/etcd/integration"
+	"github.com/coreos/etcd/pkg/testutil"
+	"github.com/coreos/etcd/pkg/transport"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"golang.org/x/net/context"
+)
+
+func TestV3ClientMetrics(t *testing.T) {
+	defer testutil.AfterTest(t)
+
+	var (
+		addr string = "localhost:27989"
+		ln   net.Listener
+		err  error
+	)
+
+	// listen for all prometheus metrics
+	donec := make(chan struct{})
+	go func() {
+		defer close(donec)
+
+		srv := &http.Server{Handler: prometheus.Handler()}
+		srv.SetKeepAlivesEnabled(false)
+
+		ln, err = transport.NewUnixListener(addr)
+		if err != nil {
+			t.Fatalf("Error : %v occured while listening on addr : %v", err, addr)
+		}
+
+		err = srv.Serve(ln)
+		if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
+			t.Fatalf("Err serving http requests: %v", err)
+		}
+	}()
+
+	url := "unix://" + addr + "/metrics"
+
+	clus := integration.NewClusterV3(t, &integration.ClusterConfig{Size: 1})
+	defer clus.Terminate(t)
+
+	client := clus.Client(0)
+
+	w := clientv3.NewWatcher(client)
+	defer w.Close()
+
+	kv := clientv3.NewKV(client)
+
+	wc := w.Watch(context.Background(), "foo")
+
+	wBefore := sumCountersForMetricAndLabels(t, url, "grpc_client_msg_received_total", "Watch", "bidi_stream")
+
+	pBefore := sumCountersForMetricAndLabels(t, url, "grpc_client_started_total", "Put", "unary")
+
+	_, err = kv.Put(context.Background(), "foo", "bar")
+	if err != nil {
+		t.Errorf("Error putting value in key store")
+	}
+
+	pAfter := sumCountersForMetricAndLabels(t, url, "grpc_client_started_total", "Put", "unary")
+	if pBefore+1 != pAfter {
+		t.Errorf("grpc_client_started_total expected : %d, got : %d", 1, pAfter-pBefore)
+	}
+
+	// consume watch response
+	select {
+	case <-wc:
+	case <-time.After(10 * time.Second):
+		t.Error("Timeout occured for getting watch response")
+	}
+
+	wAfter := sumCountersForMetricAndLabels(t, url, "grpc_client_msg_received_total", "Watch", "bidi_stream")
+	if wBefore+1 != wAfter {
+		t.Errorf("grpc_client_msg_received_total expected : %d, got %d", 1, wAfter-wBefore)
+	}
+
+	ln.Close()
+	<-donec
+}
+
+func sumCountersForMetricAndLabels(t *testing.T, url string, metricName string, matchingLabelValues ...string) int {
+	count := 0
+	for _, line := range getHTTPBodyAsLines(t, url) {
+		ok := true
+		if !strings.HasPrefix(line, metricName) {
+			continue
+		}
+
+		for _, labelValue := range matchingLabelValues {
+			if !strings.Contains(line, `"`+labelValue+`"`) {
+				ok = false
+				break
+			}
+		}
+
+		if !ok {
+			continue
+		}
+
+		valueString := line[strings.LastIndex(line, " ")+1 : len(line)-1]
+		valueFloat, err := strconv.ParseFloat(valueString, 32)
+		if err != nil {
+			t.Fatalf("failed parsing value for line: %v and matchingLabelValues : %v \n", line, matchingLabelValues)
+		}
+		count += int(valueFloat)
+	}
+	return count
+}
+
+func getHTTPBodyAsLines(t *testing.T, url string) []string {
+	cfgtls := transport.TLSInfo{}
+	tr, err := transport.NewTransport(cfgtls, time.Second)
+	if err != nil {
+		t.Fatalf("Error getting transport : %v", err)
+	}
+
+	tr.MaxIdleConns = -1
+	tr.DisableKeepAlives = true
+
+	cli := &http.Client{Transport: tr}
+
+	resp, err := cli.Get(url)
+	if err != nil {
+		t.Fatalf("Error fetching: %v", err)
+	}
+
+	reader := bufio.NewReader(resp.Body)
+	lines := []string{}
+	for {
+		line, err := reader.ReadString('\n')
+		if err != nil {
+			if err == io.EOF {
+				break
+			} else {
+				t.Fatalf("error reading: %v", err)
+			}
+		}
+		lines = append(lines, line)
+	}
+	resp.Body.Close()
+	return lines
+}