trace_common_test.go

Documentation: go.opencensus.io/plugin/ocgrpc

     1  // Copyright 2017, OpenCensus Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package ocgrpc
    16  
    17  import (
    18  	"context"
    19  	"testing"
    20  
    21  	"google.golang.org/grpc/metadata"
    22  	"google.golang.org/grpc/stats"
    23  
    24  	"go.opencensus.io/trace"
    25  )
    26  
    27  func TestClientHandler_traceTagRPC(t *testing.T) {
    28  	ch := &ClientHandler{}
    29  	ch.StartOptions.Sampler = trace.AlwaysSample()
    30  	rti := &stats.RPCTagInfo{
    31  		FullMethodName: "xxx",
    32  	}
    33  	ctx := context.Background()
    34  	ctx = ch.traceTagRPC(ctx, rti)
    35  
    36  	span := trace.FromContext(ctx)
    37  	if span == nil {
    38  		t.Fatal("expected span, got nil")
    39  	}
    40  	if !span.IsRecordingEvents() {
    41  		t.Errorf("span should be sampled")
    42  	}
    43  	md, ok := metadata.FromOutgoingContext(ctx)
    44  	if !ok || len(md) == 0 || len(md[traceContextKey]) == 0 {
    45  		t.Fatal("no metadata")
    46  	}
    47  }
    48
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