forked from lightstep/lightstep-tracer-go
/
trivial.go
61 lines (50 loc) · 1.65 KB
/
trivial.go
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// A trivial LightStep Go tracer example.
//
// $ go build -o lightstep_trivial github.com/lightstep/lightstep-tracer-go/examples/trivial
// $ ./lightstep_trivial --access_token=YOUR_ACCESS_TOKEN
package main
import (
"flag"
"fmt"
"os"
"time"
"golang.org/x/net/context"
"github.com/lightstep/lightstep-tracer-go"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/log"
)
var accessToken = flag.String("access_token", "", "your LightStep access token")
func subRoutine(ctx context.Context) {
trivialSpan, ctx := opentracing.StartSpanFromContext(ctx, "test span")
defer trivialSpan.Finish()
trivialSpan.LogEvent("logged something")
trivialSpan.LogFields(log.String("string_key", "some string value"), log.Object("trivialSpan", trivialSpan))
subSpan := opentracing.StartSpan(
"child span", opentracing.ChildOf(trivialSpan.Context()))
trivialSpan.LogFields(log.Int("int_key", 42), log.Object("subSpan", subSpan),
log.String("time.eager", fmt.Sprint(time.Now())),
log.Lazy(func(fv log.Encoder) {
fv.EmitString("time.lazy", fmt.Sprint(time.Now()))
}))
defer subSpan.Finish()
}
func main() {
flag.Parse()
if len(*accessToken) == 0 {
fmt.Println("You must specify --access_token")
os.Exit(1)
}
// Use LightStep as the global OpenTracing Tracer.
opentracing.InitGlobalTracer(lightstep.NewTracer(lightstep.Options{
AccessToken: *accessToken,
Collector: lightstep.Endpoint{"localhost", 9997, true},
UseGRPC: true,
}))
// Do something that's traced.
subRoutine(context.Background())
// Force a flush before exit.
err := lightstep.FlushLightStepTracer(opentracing.GlobalTracer())
if err != nil {
panic(err)
}
}