blob: 9466c9809d4efb8e5c082e902280405f1cd3377b [file] [log] [blame] [edit]
// Copyright 2018, OpenCensus Authors
//
// 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 main
import (
"context"
"log"
"time"
openzipkin "github.com/openzipkin/zipkin-go"
"github.com/openzipkin/zipkin-go/reporter/http"
"go.opencensus.io/exporter/zipkin"
"go.opencensus.io/trace"
)
func main() {
// The localEndpoint stores the name and address of the local service
localEndpoint, err := openzipkin.NewEndpoint("example-server", "192.168.1.5:5454")
if err != nil {
log.Println(err)
}
// The Zipkin reporter takes collected spans from the app and reports them to the backend
// http://localhost:9411/api/v2/spans is the default for the Zipkin Span v2
reporter := http.NewReporter("http://localhost:9411/api/v2/spans")
defer reporter.Close()
// The OpenCensus exporter wraps the Zipkin reporter
exporter := zipkin.NewExporter(reporter, localEndpoint)
trace.RegisterExporter(exporter)
// For example purposes, sample every trace. In a production application, you should
// configure this to a trace.ProbabilitySampler set at the desired
// probability.
trace.ApplyConfig(trace.Config{DefaultSampler: trace.AlwaysSample()})
ctx := context.Background()
foo(ctx)
}
func foo(ctx context.Context) {
// Name the current span "/foo"
ctx, span := trace.StartSpan(ctx, "/foo")
defer span.End()
// Foo calls bar and baz
bar(ctx)
baz(ctx)
}
func bar(ctx context.Context) {
ctx, span := trace.StartSpan(ctx, "/bar")
defer span.End()
// Do bar
time.Sleep(2 * time.Millisecond)
}
func baz(ctx context.Context) {
ctx, span := trace.StartSpan(ctx, "/baz")
defer span.End()
// Do baz
time.Sleep(4 * time.Millisecond)
}