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- // Copyright 2017 Google Inc. All Rights Reserved.
- //
- // Licensed under the Apache License, Version 2.0 (the "License");
- // you may not use this file except in compliance with the License.
- // You may obtain a copy of the License at
- //
- // http://www.apache.org/licenses/LICENSE-2.0
- //
- // Unless required by applicable law or agreed to in writing, software
- // distributed under the License is distributed on an "AS IS" BASIS,
- // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- // See the License for the specific language governing permissions and
- // limitations under the License.
-
- package main
-
- import (
- "bytes"
- "fmt"
- "io"
- "io/ioutil"
- "net/http"
- "os"
- )
-
- type logTransport struct {
- rt http.RoundTripper
- }
-
- func (t *logTransport) RoundTrip(req *http.Request) (*http.Response, error) {
- var buf bytes.Buffer
-
- os.Stdout.Write([]byte("\n[request]\n"))
- if req.Body != nil {
- req.Body = ioutil.NopCloser(&readButCopy{req.Body, &buf})
- }
- req.Write(os.Stdout)
- if req.Body != nil {
- req.Body = ioutil.NopCloser(&buf)
- }
- os.Stdout.Write([]byte("\n[/request]\n"))
-
- res, err := t.rt.RoundTrip(req)
-
- fmt.Printf("[response]\n")
- if err != nil {
- fmt.Printf("ERROR: %v", err)
- } else {
- body := res.Body
- res.Body = nil
- res.Write(os.Stdout)
- if body != nil {
- res.Body = ioutil.NopCloser(&echoAsRead{body})
- }
- }
-
- return res, err
- }
-
- type echoAsRead struct {
- src io.Reader
- }
-
- func (r *echoAsRead) Read(p []byte) (int, error) {
- n, err := r.src.Read(p)
- if n > 0 {
- os.Stdout.Write(p[:n])
- }
- if err == io.EOF {
- fmt.Printf("\n[/response]\n")
- }
- return n, err
- }
-
- type readButCopy struct {
- src io.Reader
- dst io.Writer
- }
-
- func (r *readButCopy) Read(p []byte) (int, error) {
- n, err := r.src.Read(p)
- if n > 0 {
- r.dst.Write(p[:n])
- }
- return n, err
- }
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