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client_test.go
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client_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/grpc-ecosystem/go-grpc-prometheus/examples/testproto"
"github.com/prometheus/client_golang/prometheus"
"github.com/stretchr/testify/require"
"github.com/stretchr/testify/suite"
"google.golang.org/grpc"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
)
var (
// client metrics must satisfy the Collector interface
_ prometheus.Collector = NewClientMetrics()
)
func TestClientInterceptorSuite(t *testing.T) {
suite.Run(t, &ClientInterceptorTestSuite{})
}
type ClientInterceptorTestSuite struct {
suite.Suite
serverListener net.Listener
server *grpc.Server
clientConn *grpc.ClientConn
testClient pb_testproto.TestServiceClient
ctx context.Context
cancel context.CancelFunc
}
func (s *ClientInterceptorTestSuite) SetupSuite() {
var err error
EnableClientHandlingTimeHistogram()
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()
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.WithUnaryInterceptor(UnaryClientInterceptor),
grpc.WithStreamInterceptor(StreamClientInterceptor),
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 *ClientInterceptorTestSuite) 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.
DefaultClientMetrics.clientStartedCounter.Reset()
DefaultClientMetrics.clientHandledCounter.Reset()
DefaultClientMetrics.clientHandledHistogram.Reset()
DefaultClientMetrics.clientStreamMsgReceived.Reset()
DefaultClientMetrics.clientStreamMsgSent.Reset()
}
func (s *ClientInterceptorTestSuite) 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 *ClientInterceptorTestSuite) TearDownTest() {
s.cancel()
}
func (s *ClientInterceptorTestSuite) TestUnaryIncrementsMetrics() {
_, err := s.testClient.PingEmpty(s.ctx, &pb_testproto.Empty{}) // should return with code=OK
require.NoError(s.T(), err)
requireValue(s.T(), 1, DefaultClientMetrics.clientStartedCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingEmpty"))
requireValue(s.T(), 1, DefaultClientMetrics.clientHandledCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingEmpty", "OK"))
requireValueHistCount(s.T(), 1, DefaultClientMetrics.clientHandledHistogram.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingEmpty"))
_, 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, DefaultClientMetrics.clientStartedCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingError"))
requireValue(s.T(), 1, DefaultClientMetrics.clientHandledCounter.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingError", "FailedPrecondition"))
requireValueHistCount(s.T(), 1, DefaultClientMetrics.clientHandledHistogram.WithLabelValues("unary", "mwitkow.testproto.TestService", "PingError"))
}
func (s *ClientInterceptorTestSuite) TestStartedStreamingIncrementsStarted() {
_, err := s.testClient.PingList(s.ctx, &pb_testproto.PingRequest{})
require.NoError(s.T(), err)
requireValue(s.T(), 1, DefaultClientMetrics.clientStartedCounter.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
_, 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")
requireValue(s.T(), 2, DefaultClientMetrics.clientStartedCounter.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
}
func (s *ClientInterceptorTestSuite) 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")
requireValue(s.T(), 1, DefaultClientMetrics.clientStartedCounter.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
requireValue(s.T(), 1, DefaultClientMetrics.clientHandledCounter.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList", "OK"))
requireValue(s.T(), countListResponses, DefaultClientMetrics.clientStreamMsgReceived.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
requireValue(s.T(), 1, DefaultClientMetrics.clientStreamMsgSent.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
requireValueHistCount(s.T(), 1, DefaultClientMetrics.clientHandledHistogram.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
ss, 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")
// Do a read, just to progate errors.
_, err = ss.Recv()
st, _ := status.FromError(err)
require.Equal(s.T(), codes.FailedPrecondition, st.Code(), "Recv must return FailedPrecondition, otherwise the test is wrong")
requireValue(s.T(), 2, DefaultClientMetrics.clientStartedCounter.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
requireValue(s.T(), 1, DefaultClientMetrics.clientHandledCounter.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList", "FailedPrecondition"))
requireValueHistCount(s.T(), 2, DefaultClientMetrics.clientHandledHistogram.WithLabelValues("server_stream", "mwitkow.testproto.TestService", "PingList"))
}