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// Copyright 2022 The OpenZipkin 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 zipkin_test
import (
"context"
"log"
"time"
zipkin "github.com/openzipkin/zipkin-go"
"github.com/openzipkin/zipkin-go/model"
"github.com/openzipkin/zipkin-go/reporter"
httpreporter "github.com/openzipkin/zipkin-go/reporter/http"
)
func doSomeWork(context.Context) {}
func ExampleNewTracer() {
// create a reporter to be used by the tracer
reporter := httpreporter.NewReporter("http://localhost:9411/api/v2/spans")
defer reporter.Close()
// set-up the local endpoint for our service
endpoint, err := zipkin.NewEndpoint("demoService", "172.20.23.100:80")
if err != nil {
log.Fatalf("unable to create local endpoint: %+v\n", err)
}
// set-up our sampling strategy
sampler, err := zipkin.NewBoundarySampler(0.01, time.Now().UnixNano())
if err != nil {
log.Fatalf("unable to create sampler: %+v\n", err)
}
// initialize the tracer
tracer, err := zipkin.NewTracer(
reporter,
zipkin.WithLocalEndpoint(endpoint),
zipkin.WithSampler(sampler),
)
if err != nil {
log.Fatalf("unable to create tracer: %+v\n", err)
}
// tracer can now be used to create spans.
span := tracer.StartSpan("some_operation")
// ... do some work ...
span.Finish()
// Output:
}
func ExampleTracerOption() {
// initialize the tracer and use the WithNoopSpan TracerOption
tracer, _ := zipkin.NewTracer(
reporter.NewNoopReporter(),
zipkin.WithNoopSpan(true),
)
// tracer can now be used to create spans
span := tracer.StartSpan("some_operation")
// ... do some work ...
span.Finish()
// Output:
}
func ExampleNewContext() {
var (
tracer, _ = zipkin.NewTracer(reporter.NewNoopReporter())
ctx = context.Background()
)
// span for this function
span := tracer.StartSpan("ExampleNewContext")
defer span.Finish()
// add span to Context
ctx = zipkin.NewContext(ctx, span)
// pass along Context which holds the span to another function
doSomeWork(ctx)
// Output:
}
func ExampleSpanOption() {
tracer, _ := zipkin.NewTracer(reporter.NewNoopReporter())
// set-up the remote endpoint for the service we're about to call
endpoint, err := zipkin.NewEndpoint("otherService", "172.20.23.101:80")
if err != nil {
log.Fatalf("unable to create remote endpoint: %+v\n", err)
}
// start a client side RPC span and use RemoteEndpoint SpanOption
span := tracer.StartSpan(
"some-operation",
zipkin.RemoteEndpoint(endpoint),
zipkin.Kind(model.Client),
)
// ... call other service ...
span.Finish()
// Output:
}
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