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dump.go
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dump.go
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package req
import (
"bufio"
"bytes"
"io"
"io/ioutil"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strings"
"time"
)
// Debug enable debug mode if set to true
var Debug bool
// dumpConn is a net.Conn which writes to Writer and reads from Reader
type dumpConn struct {
io.Writer
io.Reader
}
func (c *dumpConn) Close() error { return nil }
func (c *dumpConn) LocalAddr() net.Addr { return nil }
func (c *dumpConn) RemoteAddr() net.Addr { return nil }
func (c *dumpConn) SetDeadline(t time.Time) error { return nil }
func (c *dumpConn) SetReadDeadline(t time.Time) error { return nil }
func (c *dumpConn) SetWriteDeadline(t time.Time) error { return nil }
// delegateReader is a reader that delegates to another reader,
// once it arrives on a channel.
type delegateReader struct {
c chan io.Reader
r io.Reader // nil until received from c
}
func (r *delegateReader) Read(p []byte) (int, error) {
if r.r == nil {
r.r = <-r.c
}
return r.r.Read(p)
}
type dummyBody struct {
N int
off int
}
func (d *dummyBody) Read(p []byte) (n int, err error) {
if d.N <= 0 {
err = io.EOF
return
}
left := d.N - d.off
if left <= 0 {
err = io.EOF
return
}
if l := len(p); l > 0 {
if l >= left {
n = left
err = io.EOF
} else {
n = l
}
d.off += n
for i := 0; i < n; i++ {
p[i] = '*'
}
}
return
}
func (d *dummyBody) Close() error {
return nil
}
type dumpBuffer struct {
bytes.Buffer
}
func (b *dumpBuffer) Write(p []byte) {
b.Buffer.Write(p)
b.Buffer.WriteString("\r\n\r\n")
}
func (b *dumpBuffer) WriteString(s string) {
b.Write([]byte(s))
}
func (r *Resp) dumpRequest(dump *dumpBuffer) {
head := r.r.flag&LreqHead != 0
body := r.r.flag&LreqBody != 0
if head {
r.dumpReqHead(dump)
}
if body {
if r.multipartHelper != nil {
dump.Write(r.multipartHelper.Dump())
} else if len(r.reqBody) > 0 {
dump.Write(r.reqBody)
}
}
}
func (r *Resp) dumpReqHead(dump *dumpBuffer) {
reqSend := new(http.Request)
*reqSend = *r.req
if reqSend.URL.Scheme == "https" {
reqSend.URL = new(url.URL)
*reqSend.URL = *r.req.URL
reqSend.URL.Scheme = "http"
}
if reqSend.ContentLength > 0 {
reqSend.Body = &dummyBody{N: int(reqSend.ContentLength)}
} else {
reqSend.Body = &dummyBody{N: 1}
}
// Use the actual Transport code to record what we would send
// on the wire, but not using TCP. Use a Transport with a
// custom dialer that returns a fake net.Conn that waits
// for the full input (and recording it), and then responds
// with a dummy response.
var buf bytes.Buffer // records the output
pr, pw := io.Pipe()
defer pw.Close()
dr := &delegateReader{c: make(chan io.Reader)}
t := &http.Transport{
Dial: func(net, addr string) (net.Conn, error) {
return &dumpConn{io.MultiWriter(&buf, pw), dr}, nil
},
}
defer t.CloseIdleConnections()
client := new(http.Client)
*client = *r.client
client.Transport = t
// Wait for the request before replying with a dummy response:
go func() {
req, err := http.ReadRequest(bufio.NewReader(pr))
if err == nil {
// Ensure all the body is read; otherwise
// we'll get a partial dump.
io.Copy(ioutil.Discard, req.Body)
req.Body.Close()
}
dr.c <- strings.NewReader("HTTP/1.1 204 No Content\r\nConnection: close\r\n\r\n")
pr.Close()
}()
_, err := client.Do(reqSend)
if err != nil {
dump.WriteString(err.Error())
} else {
reqDump := buf.Bytes()
if i := bytes.Index(reqDump, []byte("\r\n\r\n")); i >= 0 {
reqDump = reqDump[:i]
}
dump.Write(reqDump)
}
}
func (r *Resp) dumpResponse(dump *dumpBuffer) {
head := r.r.flag&LrespHead != 0
body := r.r.flag&LrespBody != 0
if head {
respDump, err := httputil.DumpResponse(r.resp, false)
if err != nil {
dump.WriteString(err.Error())
} else {
if i := bytes.Index(respDump, []byte("\r\n\r\n")); i >= 0 {
respDump = respDump[:i]
}
dump.Write(respDump)
}
}
if body && len(r.Bytes()) > 0 {
dump.Write(r.Bytes())
}
}
func (r *Resp) Dump() string {
dump := new(dumpBuffer)
r.dumpRequest(dump)
l := dump.Len()
if l > 0 {
dump.WriteString("=================================")
l = dump.Len()
}
r.dumpResponse(dump)
return dump.String()
}