| // 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 |
| } |