/
handler.go
28 lines (25 loc) · 870 Bytes
/
handler.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
package tracing
import (
"github.com/golang/glog"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/ext"
"net/http"
)
type OpentracingHandler http.HandlerFunc
func NewWithParentSpan(spanName string, next http.HandlerFunc) OpentracingHandler {
return func(writer http.ResponseWriter, request *http.Request) {
spanContext, err := opentracing.GlobalTracer().Extract(
opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(request.Header))
if err != nil {
glog.Warning("opentracing parent span headers extract", err)
next(writer, request)
}
span := opentracing.StartSpan(spanName,
opentracing.ChildOf(spanContext))
defer span.Finish()
ext.SpanKind.Set(span, "server")
ext.Component.Set(span, spanName)
ctx := opentracing.ContextWithSpan(request.Context(), span)
next(writer, request.WithContext(ctx))
}
}