/
hello.go
97 lines (78 loc) · 2.2 KB
/
hello.go
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package main
import (
"context"
"net/http"
"net/url"
"os"
xhttp "github.com/evanlixin/jaeger-examples/pkg/http"
"github.com/evanlixin/jaeger-examples/pkg/tracing"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"github.com/opentracing/opentracing-go/log"
)
func main() {
if len(os.Args) != 3 {
panic("ERROR: Expecting two arguments")
}
tracer, closer := tracing.Init("hello-world-4")
defer closer.Close()
opentracing.SetGlobalTracer(tracer)
helloTo := os.Args[1]
greeting := os.Args[2]
span := opentracing.GlobalTracer().StartSpan("say-hello")
span.SetTag("hello-to", helloTo)
span.SetBaggageItem("greeting", greeting)
defer span.Finish()
ctx := opentracing.ContextWithSpan(context.Background(), span)
helloStr := formatString(ctx, helloTo)
printHello(ctx, helloStr)
}
func formatString(ctx context.Context, helloTo string) string {
span, _ := opentracing.StartSpanFromContext(ctx, "formatString")
defer span.Finish()
v := url.Values{}
v.Set("helloTo", helloTo)
url := "http://localhost:8081/format?" + v.Encode()
req, err := http.NewRequest("GET", url, nil)
if err != nil {
panic(err.Error())
}
ext.SpanKindRPCClient.Set(span)
ext.HTTPUrl.Set(span, url)
ext.HTTPMethod.Set(span, "GET")
span.Tracer().Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(req.Header),
)
resp, err := xhttp.Do(req)
if err != nil {
ext.LogError(span, err)
panic(err.Error())
}
helloStr := string(resp)
span.LogFields(
log.String("event", "string-format"),
log.String("value", helloStr),
)
return helloStr
}
func printHello(ctx context.Context, helloStr string) {
span, _ := opentracing.StartSpanFromContext(ctx, "printHello")
defer span.Finish()
v := url.Values{}
v.Set("helloStr", helloStr)
url := "http://localhost:8082/publish?" + v.Encode()
req, err := http.NewRequest("GET", url, nil)
if err != nil {
panic(err.Error())
}
ext.SpanKindRPCClient.Set(span)
ext.HTTPUrl.Set(span, url)
ext.HTTPMethod.Set(span, "GET")
span.Tracer().Inject(span.Context(), opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(req.Header))
if _, err := xhttp.Do(req); err != nil {
ext.LogError(span, err)
panic(err.Error())
}
}