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restful.go
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restful.go
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// Package restful provides functions to trace the emicklei/go-restful package (https://github.com/emicklei/go-restful).
package restful
import (
"strconv"
"github.com/emicklei/go-restful"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/ext"
"gopkg.in/DataDog/dd-trace-go.v1/ddtrace/tracer"
)
// Filter is a filter that will trace incoming request
func Filter(req *restful.Request, resp *restful.Response, chain *restful.FilterChain) {
opts := []ddtrace.StartSpanOption{
tracer.ResourceName(req.SelectedRoutePath()),
tracer.SpanType(ext.SpanTypeWeb),
tracer.Tag(ext.HTTPMethod, req.Request.Method),
tracer.Tag(ext.HTTPURL, req.Request.URL.Path),
}
if spanctx, err := tracer.Extract(tracer.HTTPHeadersCarrier(req.Request.Header)); err == nil {
opts = append(opts, tracer.ChildOf(spanctx))
}
span, ctx := tracer.StartSpanFromContext(req.Request.Context(), "http.request", opts...)
defer span.Finish()
// pass the span through the request context
req.Request = req.Request.WithContext(ctx)
chain.ProcessFilter(req, resp)
span.SetTag(ext.HTTPCode, strconv.Itoa(resp.StatusCode()))
span.SetTag(ext.Error, resp.Error())
}