rclone/vendor/cloud.google.com/go/trace/grpc_test.go
2017-07-23 08:51:42 +01:00

179 lines
5.3 KiB
Go

// Copyright 2017 Google Inc. All Rights Reserved.
//
// 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 (
"io/ioutil"
"log"
"net"
"net/http"
"strings"
"testing"
pb "cloud.google.com/go/trace/testdata/helloworld"
"golang.org/x/net/context"
"google.golang.org/grpc"
)
func TestGRPCInterceptors(t *testing.T) {
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.Fatalf("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.Fatalf("Failed to serve: %v", err)
}
}()
addr := <-addrCh
conn, err := grpc.Dial(addr.String(), grpc.WithInsecure(), 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)
}