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opentracing.go
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opentracing.go
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// Copyright 2020 tsuru authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package net
import (
"io"
"net/http"
opentracingHTTP "github.com/opentracing-contrib/go-stdlib/nethttp"
"github.com/opentracing/opentracing-go"
)
func withOpenTracing(cli *http.Client) *http.Client {
return &http.Client{
Timeout: cli.Timeout,
CheckRedirect: cli.CheckRedirect,
Transport: &AutoOpentracingTransport{
RoundTripper: cli.Transport,
},
}
}
func OpentracingTransport(rt http.RoundTripper) http.RoundTripper {
return &AutoOpentracingTransport{RoundTripper: rt}
}
type AutoOpentracingTransport struct {
http.RoundTripper
}
func (t *AutoOpentracingTransport) RoundTrip(req *http.Request) (*http.Response, error) {
rt := t.RoundTripper
tracer := opentracing.GlobalTracer()
if rt == nil {
rt = http.DefaultTransport
}
req, ht := opentracingHTTP.TraceRequest(tracer, req)
transport := &opentracingHTTP.Transport{RoundTripper: rt}
response, err := transport.RoundTrip(req)
if err != nil {
ht.Finish()
return nil, err
}
readWriteCloser, ok := response.Body.(io.ReadWriteCloser)
if ok {
response.Body = &autoWriterCloseTracer{ht: ht, ReadWriteCloser: readWriteCloser}
} else {
response.Body = &autoCloseTracer{ht: ht, ReadCloser: response.Body}
}
return response, nil
}
type autoCloseTracer struct {
io.ReadCloser
ht *opentracingHTTP.Tracer
}
func (a *autoCloseTracer) Close() error {
err := a.ReadCloser.Close()
a.ht.Finish()
return err
}
type autoWriterCloseTracer struct {
io.ReadWriteCloser
ht *opentracingHTTP.Tracer
}
func (a *autoWriterCloseTracer) Close() error {
err := a.ReadWriteCloser.Close()
a.ht.Finish()
return err
}