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server_stats_handler_test.go
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server_stats_handler_test.go
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// Copyright 2016 Michal Witkowski. All Rights Reserved.
// See LICENSE for licensing terms.
package grpc_prometheus
import (
"context"
"io"
"net"
"testing"
"time"
pb_testproto "github.com/netsec-ethz/go-grpc-prom/examples/testproto"
"github.com/stretchr/testify/require"
"github.com/stretchr/testify/suite"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
)
func TestServerStatsHandlerSuite(t *testing.T) {
suite.Run(t, &ServerStatsHandlerTestSuite{})
}
type ServerStatsHandlerTestSuite struct {
suite.Suite
serverListener net.Listener
server *grpc.Server
clientConn *grpc.ClientConn
testClient pb_testproto.TestServiceClient
ctx context.Context
cancel context.CancelFunc
}
func (s *ServerStatsHandlerTestSuite) SetupSuite() {
var err error
EnableHandlingTimeHistogram()
EnableServerMsgSizeReceivedBytesHistogram()
EnableServerMsgSizeSentBytesHistogram()
s.serverListener, err = net.Listen("tcp", "127.0.0.1:0")
require.NoError(s.T(), err, "must be able to allocate a port for serverListener")
// This is the point where we hook up the interceptor
s.server = grpc.NewServer(
grpc.StatsHandler(ServerStatsHandler),
)
pb_testproto.RegisterTestServiceServer(s.server, &testService{t: s.T()})
go func() {
s.server.Serve(s.serverListener)
}()
s.clientConn, err = grpc.Dial(s.serverListener.Addr().String(), grpc.WithInsecure(), grpc.WithBlock(), grpc.WithTimeout(2*time.Second))
require.NoError(s.T(), err, "must not error on client Dial")
s.testClient = pb_testproto.NewTestServiceClient(s.clientConn)
}
func (s *ServerStatsHandlerTestSuite) SetupTest() {
// Make all RPC calls last at most 2 sec, meaning all async issues or deadlock will not kill tests.
s.ctx, s.cancel = context.WithTimeout(context.TODO(), 2*time.Second)
// Make sure every test starts with same fresh, intialized metric state.
DefaultServerMetrics.serverStartedCounter.Reset()
DefaultServerMetrics.serverHandledCounter.Reset()
DefaultServerMetrics.serverHandledHistogram.Reset()
DefaultServerMetrics.serverStreamMsgReceived.Reset()
DefaultServerMetrics.serverStreamMsgSent.Reset()
DefaultServerMetrics.serverMsgSizeReceivedHistogram.Reset()
DefaultServerMetrics.serverMsgSizeSentHistogram.Reset()
Register(s.server)
}
func (s *ServerStatsHandlerTestSuite) TearDownSuite() {
if s.serverListener != nil {
s.server.Stop()
s.T().Logf("stopped grpc.Server at: %v", s.serverListener.Addr().String())
s.serverListener.Close()
}
if s.clientConn != nil {
s.clientConn.Close()
}
}
func (s *ServerStatsHandlerTestSuite) TearDownTest() {
s.cancel()
}
func (s *ServerStatsHandlerTestSuite) TestUnaryIncrementsMetrics() {
_, err := s.testClient.PingEmpty(s.ctx, &pb_testproto.Empty{}) // should return with code=OK
require.NoError(s.T(), err)
requireValue(s.T(), 1, DefaultServerMetrics.serverStartedCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingEmpty"))
requireValue(s.T(), 1, DefaultServerMetrics.serverHandledCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingEmpty", "OK"))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverHandledHistogram.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingEmpty"))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingEmpty", Header.String()))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingEmpty", Payload.String()))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeSentHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingEmpty", Payload.String()))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeSentHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingEmpty", Tailer.String()))
_, err = s.testClient.PingError(s.ctx, &pb_testproto.PingRequest{ErrorCodeReturned: uint32(codes.FailedPrecondition)}) // should return with code=FailedPrecondition
require.Error(s.T(), err)
requireValue(s.T(), 1, DefaultServerMetrics.serverStartedCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingError"))
requireValue(s.T(), 1, DefaultServerMetrics.serverHandledCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingError", "FailedPrecondition"))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverHandledHistogram.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingError"))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingEmpty", Header.String()))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingEmpty", Payload.String()))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeSentHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingEmpty", Tailer.String()))
}
func (s *ServerStatsHandlerTestSuite) TestStreamingIncrementsMetrics() {
ss, _ := s.testClient.PingList(s.ctx, &pb_testproto.PingRequest{}) // should return with code=OK
// Do a read, just for kicks.
count := 0
for {
_, err := ss.Recv()
if err == io.EOF {
break
}
require.NoError(s.T(), err, "reading pingList shouldn't fail")
count++
}
require.EqualValues(s.T(), countListResponses, count, "Number of received msg on the wire must match")
requireValueWithRetry(s.ctx, s.T(), 1,
DefaultServerMetrics.serverStartedCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList"))
requireValueWithRetry(s.ctx, s.T(), 1,
DefaultServerMetrics.serverHandledCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList", "OK"))
requireValueWithRetry(s.ctx, s.T(), countListResponses,
DefaultServerMetrics.serverStreamMsgSent.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList"))
requireValueWithRetry(s.ctx, s.T(), 1,
DefaultServerMetrics.serverStreamMsgReceived.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList"))
requireValueHistCount(s.T(), 1,
DefaultServerMetrics.serverHandledHistogram.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList"))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingList", Header.String()))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingList", Payload.String()))
requireValueHistCount(s.T(), countListResponses, DefaultServerMetrics.serverMsgSizeSentHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingList", Payload.String()))
requireValueHistCount(s.T(), 1, DefaultServerMetrics.serverMsgSizeSentHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingList", Tailer.String()))
_, err := s.testClient.PingList(s.ctx, &pb_testproto.PingRequest{ErrorCodeReturned: uint32(codes.FailedPrecondition)}) // should return with code=FailedPrecondition
require.NoError(s.T(), err, "PingList must not fail immediately")
requireValueWithRetry(s.ctx, s.T(), 2,
DefaultServerMetrics.serverStartedCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList"))
requireValueWithRetry(s.ctx, s.T(), 1,
DefaultServerMetrics.serverHandledCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList", "FailedPrecondition"))
requireValueHistCount(s.T(), 2,
DefaultServerMetrics.serverHandledHistogram.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingList"))
requireValueHistCount(s.T(), 2, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingList", Header.String()))
requireValueHistCount(s.T(), 2, DefaultServerMetrics.serverMsgSizeReceivedHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingList", Payload.String()))
requireValueHistCount(s.T(), 2, DefaultServerMetrics.serverMsgSizeSentHistogram.WithLabelValues("mwitkow.testproto.TestService", "PingList", Tailer.String()))
}