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- // Copyright 2017 Google LLC
- //
- // 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 trace
-
- import (
- "context"
- "io/ioutil"
- "log"
- "net"
- "net/http"
- "strings"
- "testing"
-
- pb "cloud.google.com/go/trace/testdata/helloworld"
- "google.golang.org/grpc"
- )
-
- func TestGRPCInterceptors(t *testing.T) {
- t.Skip("hangs forever for go < 1.9")
-
- tc := newTestClient(&noopTransport{})
-
- // default sampling with global=1.
- parent := tc.SpanFromHeader("parent", "7f27601f17b7a2873739efd18ff83872/123;o=1")
- testGRPCInterceptor(t, tc, parent, func(t *testing.T, out, in *Span) {
- if in == nil {
- t.Fatalf("missing span in the incoming context")
- }
- if got, want := in.TraceID(), out.TraceID(); got != want {
- t.Errorf("incoming call is not tracing the outgoing trace; TraceID = %q; want %q", got, want)
- }
- if !in.Traced() {
- t.Errorf("incoming span is not traced; want traced")
- }
- })
-
- // default sampling with global=0.
- parent = tc.SpanFromHeader("parent", "7f27601f17b7a2873739efd18ff83872/123;o=0")
- testGRPCInterceptor(t, tc, parent, func(t *testing.T, out, in *Span) {
- if in == nil {
- t.Fatalf("missing span in the incoming context")
- }
- if got, want := in.TraceID(), out.TraceID(); got != want {
- t.Errorf("incoming call is not tracing the outgoing trace; TraceID = %q; want %q", got, want)
- }
- if in.Traced() {
- t.Errorf("incoming span is traced; want not traced")
- }
- })
-
- // sampling all with global=1.
- all, _ := NewLimitedSampler(1.0, 1<<32)
- tc.SetSamplingPolicy(all)
- parent = tc.SpanFromHeader("parent", "7f27601f17b7a2873739efd18ff83872/123;o=1")
- testGRPCInterceptor(t, tc, parent, func(t *testing.T, out, in *Span) {
- if in == nil {
- t.Fatalf("missing span in the incoming context")
- }
- if got, want := in.TraceID(), out.TraceID(); got != want {
- t.Errorf("incoming call is not tracing the outgoing trace; TraceID = %q; want %q", got, want)
- }
- if !in.Traced() {
- t.Errorf("incoming span is not traced; want traced")
- }
- })
-
- // sampling none with global=1.
- none, _ := NewLimitedSampler(0, 0)
- tc.SetSamplingPolicy(none)
- parent = tc.SpanFromHeader("parent", "7f27601f17b7a2873739efd18ff83872/123;o=1")
- testGRPCInterceptor(t, tc, parent, func(t *testing.T, out, in *Span) {
- if in == nil {
- t.Fatalf("missing span in the incoming context")
- }
- if got, want := in.TraceID(), out.TraceID(); got != want {
- t.Errorf("incoming call is not tracing the outgoing trace; TraceID = %q; want %q", got, want)
- }
- if in.Traced() {
- t.Errorf("incoming span is traced; want not traced")
- }
- })
-
- // sampling all with no parent span.
- tc.SetSamplingPolicy(all)
- testGRPCInterceptor(t, tc, nil, func(t *testing.T, out, in *Span) {
- if in == nil {
- t.Fatalf("missing span in the incoming context")
- }
- if in.TraceID() == "" {
- t.Errorf("incoming call TraceID is empty")
- }
- if !in.Traced() {
- t.Errorf("incoming span is not traced; want traced")
- }
- })
-
- // sampling none with no parent span.
- tc.SetSamplingPolicy(none)
- testGRPCInterceptor(t, tc, nil, func(t *testing.T, out, in *Span) {
- if in == nil {
- t.Fatalf("missing span in the incoming context")
- }
- if in.TraceID() == "" {
- t.Errorf("incoming call TraceID is empty")
- }
- if in.Traced() {
- t.Errorf("incoming span is traced; want not traced")
- }
- })
- }
-
- func testGRPCInterceptor(t *testing.T, tc *Client, parent *Span, assert func(t *testing.T, out, in *Span)) {
- incomingCh := make(chan *Span, 1)
- addrCh := make(chan net.Addr, 1)
- go func() {
- lis, err := net.Listen("tcp", "")
- if err != nil {
- t.Errorf("Failed to listen: %v", err)
- }
- addrCh <- lis.Addr()
-
- s := grpc.NewServer(grpc.UnaryInterceptor(tc.GRPCServerInterceptor()))
- pb.RegisterGreeterServer(s, &grpcServer{
- fn: func(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
- incomingCh <- FromContext(ctx)
- return &pb.HelloReply{}, nil
- },
- })
- if err := s.Serve(lis); err != nil {
- t.Errorf("Failed to serve: %v", err)
- }
- }()
-
- addr := <-addrCh
- conn, err := grpc.Dial(addr.String(), grpc.WithInsecure(), grpc.WithBlock(), grpc.WithUnaryInterceptor(tc.GRPCClientInterceptor()))
- if err != nil {
- t.Fatalf("Did not connect: %v", err)
- }
- defer conn.Close()
- c := pb.NewGreeterClient(conn)
-
- outgoingCtx := NewContext(context.Background(), parent)
- _, err = c.SayHello(outgoingCtx, &pb.HelloRequest{})
- if err != nil {
- log.Fatalf("Could not SayHello: %v", err)
- }
-
- assert(t, parent, <-incomingCh)
- }
-
- type noopTransport struct{}
-
- func (rt *noopTransport) RoundTrip(req *http.Request) (*http.Response, error) {
- resp := &http.Response{
- Status: "200 OK",
- StatusCode: 200,
- Body: ioutil.NopCloser(strings.NewReader("{}")),
- }
- return resp, nil
- }
-
- type grpcServer struct {
- fn func(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error)
- }
-
- func (s *grpcServer) SayHello(ctx context.Context, in *pb.HelloRequest) (*pb.HelloReply, error) {
- return s.fn(ctx, in)
- }
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