| // 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) |
| } |