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client.go
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client.go
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package main
import (
"context"
"log"
"net/http"
"github.com/evanlixin/jaeger-examples/pkg/tracing"
"github.com/opentracing-contrib/go-stdlib/nethttp"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
)
const DefaultComponentName = "go-restful"
const DefaultOperationName = "go-restful client"
func main() {
tracer, closer := tracing.Init("restful-client")
defer closer.Close()
opentracing.SetGlobalTracer(tracer)
span, _ := opentracing.StartSpanFromContext(context.Background(), "getHello")
defer span.Finish()
// 2) Demonstrate nethttp client-side OpenTracing instrumentation works
client := &http.Client{Transport: &nethttp.Transport{}}
req, err := http.NewRequest("GET", "http://127.0.0.1:8083/hello", nil)
if err != nil {
log.Fatal(err)
}
ext.SpanKindRPCClient.Set(span)
ext.HTTPUrl.Set(span, req.URL.Path)
ext.HTTPMethod.Set(span, "GET")
span.Tracer().Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(req.Header),
)
/*
req, ht := nethttp.TraceRequest(tracer, req,
nethttp.OperationName(DefaultOperationName), nethttp.ComponentName(DefaultComponentName))
*/
_, err = client.Do(req)
if err != nil {
ext.LogError(span, err)
log.Fatal(err)
}
//ht.Finish()
}