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/*
* Copyright 2018 Expedia Group.
*
* 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 (
"fmt"
"net/http"
"time"
haystack "github.com/ExpediaDotCom/haystack-client-go"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
)
type consoleLogger struct{}
/*Error prints the error message*/
func (logger *consoleLogger) Error(format string, v ...interface{}) {
fmt.Printf(format, v...)
fmt.Print("\n")
}
/*Info prints the info message*/
func (logger *consoleLogger) Info(format string, v ...interface{}) {
fmt.Printf(format, v...)
fmt.Print("\n")
}
/*Debug prints the info message*/
func (logger *consoleLogger) Debug(format string, v ...interface{}) {
fmt.Printf(format, v...)
fmt.Print("\n")
}
func main() {
/*Use haystack.NewDefaultAgentDispatcher() for non-dev environment*/
tracer, closer := haystack.NewTracer("dummy-service", haystack.NewDefaultAgentDispatcher(), haystack.TracerOptionsFactory.Tag("appVer", "v1.1"), haystack.TracerOptionsFactory.Logger(&consoleLogger{}))
defer func() {
err := closer.Close()
if err != nil {
panic(err)
}
}()
carrier := opentracing.HTTPHeadersCarrier(http.Header(map[string][]string{
"Trace-Id": {"409dec0e-473e-11e9-81cc-186590cf29af"},
"Span-Id": {"509df8d3-473e-11e9-81cc-186590cf29af"},
"Parent-Id": {"609df88c-473e-11e9-81cc-186590cf29af"},
}))
clientContext, err := tracer.Extract(opentracing.HTTPHeaders, carrier)
if err != nil {
panic(err)
}
span1 := tracer.StartSpan("operation1", opentracing.ChildOf(clientContext), opentracing.Tag{Key: "my-tag", Value: "something"})
span1.SetTag(string(ext.SpanKind), ext.SpanKindRPCServerEnum)
span1.SetTag(string(ext.Error), false)
span1.SetTag(string(ext.HTTPStatusCode), 200)
span1.SetTag(string(ext.HTTPMethod), "POST")
span1.LogEventWithPayload("code", 1001)
span2 := tracer.StartSpan("operation2", opentracing.ChildOf(span1.Context()))
// a slightly different way to set the tags on a span
ext.Error.Set(span2, true)
ext.HTTPStatusCode.Set(span1, 404)
// inject the span context in http header using tracer.Inject(...)
req, _ := http.NewRequest(http.MethodGet, "https://expediadotcom.github.io/haystack/", nil)
tracer.Inject(span2.Context(), opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(req.Header))
//
//log.Println(req.Header)
span2.Finish()
span1.Finish()
time.Sleep(5 * time.Second)
}
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