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|
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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