github.com/cockroachdb/cockroach@v20.2.0-alpha.1+incompatible/pkg/server/graphite_test.go (about)

     1  // Copyright 2018 The Cockroach Authors.
     2  //
     3  // Use of this software is governed by the Business Source License
     4  // included in the file licenses/BSL.txt.
     5  //
     6  // As of the Change Date specified in that file, in accordance with
     7  // the Business Source License, use of this software will be governed
     8  // by the Apache License, Version 2.0, included in the file
     9  // licenses/APL.txt.
    10  
    11  package server
    12  
    13  import (
    14  	"context"
    15  	"fmt"
    16  	"net"
    17  	"testing"
    18  	"time"
    19  
    20  	"github.com/cockroachdb/cockroach/pkg/base"
    21  	"github.com/cockroachdb/cockroach/pkg/testutils/serverutils"
    22  	"github.com/cockroachdb/cockroach/pkg/testutils/sqlutils"
    23  	"github.com/cockroachdb/cockroach/pkg/util/leaktest"
    24  	"github.com/cockroachdb/cockroach/pkg/util/log"
    25  )
    26  
    27  // TestGraphite tests that a server pushes metrics data to Graphite endpoint,
    28  // if configured. In addition, it verifies that things don't fall apart when
    29  // the endpoint goes away.
    30  func TestGraphite(t *testing.T) {
    31  	defer leaktest.AfterTest(t)()
    32  	s, rawDB, _ := serverutils.StartServer(t, base.TestServerArgs{})
    33  	defer s.Stopper().Stop(context.Background())
    34  	ctx := context.Background()
    35  
    36  	const setQ = `SET CLUSTER SETTING "%s" = "%s"`
    37  	const interval = 3 * time.Millisecond
    38  	db := sqlutils.MakeSQLRunner(rawDB)
    39  	db.Exec(t, fmt.Sprintf(setQ, graphiteIntervalKey, interval))
    40  
    41  	listen := func() {
    42  		lis, err := net.Listen("tcp", "127.0.0.1:0")
    43  		if err != nil {
    44  			t.Fatal("failed to open port", err)
    45  		}
    46  		p := lis.Addr().String()
    47  		log.Infof(ctx, "Open port %s and listening", p)
    48  
    49  		defer func() {
    50  			log.Infof(ctx, "Close port %s", p)
    51  			if err := lis.Close(); err != nil {
    52  				t.Fatal("failed to close port", err)
    53  			}
    54  		}()
    55  
    56  		db.Exec(t, fmt.Sprintf(setQ, "external.graphite.endpoint", p))
    57  		if _, e := lis.Accept(); e != nil {
    58  			t.Fatal("failed to receive connection", e)
    59  		} else {
    60  			log.Info(ctx, "received connection")
    61  		}
    62  	}
    63  
    64  	listen()
    65  	log.Info(ctx, "Make sure things don't fall apart when endpoint goes away.")
    66  	time.Sleep(5 * interval)
    67  	listen()
    68  }