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// Copyright 2017 Google LLC
//
// 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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