/
logtransport.go
77 lines (68 loc) · 1.65 KB
/
logtransport.go
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// Package logtransport implements a http.RoundTripper which logs request before the request is sent and response after the request.
package logtransport
import (
"bufio"
"bytes"
"log"
"net/http"
"net/http/httputil"
"os"
)
var defaultLogger = log.New(os.Stdout, "", log.LstdFlags)
// Logger is an interface of a logger, which is used for logging
// outgoing HTTP request and incoming HTTP response.
type Printer interface {
Print(args ...interface{})
}
// Transport is a wrapper of http.RoundTripper.
type Transport struct {
Transport http.RoundTripper
Logger Printer
}
// RoundTrip implements http.RoundTripper interface.
func (t *Transport) RoundTrip(r *http.Request) (*http.Response, error) {
if err := t.logRequest(r); err != nil {
return nil, err
}
transport := t.Transport
if transport == nil {
transport = http.DefaultTransport
}
resp, err := transport.RoundTrip(r)
if err != nil {
return nil, err
}
if err := t.logResponse(resp); err != nil {
return nil, err
}
return resp, nil
}
func (t *Transport) Print(args ...interface{}) {
logger := t.Logger
if logger == nil {
logger = defaultLogger
}
logger.Print(args...)
}
func (t *Transport) logRequest(r *http.Request) error {
b, err := httputil.DumpRequestOut(r, true)
if err != nil {
return err
}
scanner := bufio.NewScanner(bytes.NewReader(b))
for scanner.Scan() {
t.Print(scanner.Text())
}
return scanner.Err()
}
func (t *Transport) logResponse(resp *http.Response) error {
b, err := httputil.DumpResponse(resp, true)
if err != nil {
return err
}
scanner := bufio.NewScanner(bytes.NewReader(b))
for scanner.Scan() {
t.Print(scanner.Text())
}
return scanner.Err()
}