http: make Request.Body an io.ReadCloser, matching Response.Body.

R=rsc, rsc1
CC=golang-dev
https://golang.org/cl/194046

src/pkg/http/client.go

@@ -137,7 +137,7 @@ func Get(url string) (r *Response, finalURL string, err os.Error) {
 func Post(url string, bodyType string, body io.Reader) (r *Response, err os.Error) {
 	var req Request
 	req.Method = "POST"
-	req.Body = body
+	req.Body = nopCloser{body}
 	req.Header = map[string]string{
 		"Content-Type": bodyType,
 		"Transfer-Encoding": "chunked",
@@ -150,3 +150,9 @@ func Post(url string, bodyType string, body io.Reader) (r *Response, err os.Erro
 
 	return send(&req)
 }
+
+type nopCloser struct {
+	io.Reader
+}
+
+func (nopCloser) Close() os.Error { return nil }

src/pkg/http/request.go

@@ -80,7 +80,7 @@ type Request struct {
 	Header map[string]string
 
 	// The message body.
-	Body io.Reader
+	Body io.ReadCloser
 
 	// Whether to close the connection after replying to this request.
 	Close bool
@@ -135,7 +135,8 @@ const defaultUserAgent = "Go http package"
 //	Header
 //	Body
 //
-// If Body is present, "Transfer-Encoding: chunked" is forced as a header.
+// If Body is present, Write forces "Transfer-Encoding: chunked" as a header
+// and then closes Body when finished sending it.
 func (req *Request) Write(w io.Writer) os.Error {
 	uri := urlEscape(req.URL.Path, false)
 	if req.URL.RawQuery != "" {
@@ -198,6 +199,7 @@ func (req *Request) Write(w io.Writer) os.Error {
 				return io.ErrShortWrite
 			}
 		}
+		req.Body.Close()
 		// last-chunk CRLF
 		fmt.Fprint(w, "0\r\n\r\n")
 	}
@@ -572,19 +574,14 @@ func ReadRequest(b *bufio.Reader) (req *Request, err os.Error) {
 	// A message body exists when either Content-Length or Transfer-Encoding
 	// headers are present. Transfer-Encoding trumps Content-Length.
 	if v, present := req.Header["Transfer-Encoding"]; present && v == "chunked" {
-		req.Body = newChunkedReader(b)
+		req.Body = &body{Reader: newChunkedReader(b), th: req, r: b, closing: req.Close}
 	} else if v, present := req.Header["Content-Length"]; present {
-		length, err := strconv.Btoui64(v, 10)
+		length, err := strconv.Btoi64(v, 10)
 		if err != nil {
 			return nil, &badStringError{"invalid Content-Length", v}
 		}
 		// TODO: limit the Content-Length. This is an easy DoS vector.
-		raw := make([]byte, length)
-		n, err := b.Read(raw)
-		if err != nil || uint64(n) < length {
-			return nil, ErrShortBody
-		}
-		req.Body = bytes.NewBuffer(raw)
+		req.Body = &body{Reader: io.LimitReader(b, length), closing: req.Close}
 	}
 
 	return req, nil

src/pkg/http/request_test.go

@@ -90,7 +90,7 @@ func TestPostContentTypeParsing(t *testing.T) {
 		req := &Request{
 			Method: "POST",
 			Header: test.contentType,
-			Body: bytes.NewBufferString("body"),
+			Body: nopCloser{bytes.NewBufferString("body")},
 		}
 		err := req.ParseForm()
 		if !test.error && err != nil {

src/pkg/http/response.go

@@ -134,7 +134,7 @@ func ReadResponse(r *bufio.Reader, requestMethod string) (resp *Response, err os
 	// or close connection when finished, since multipart is not supported yet
 	switch {
 	case chunked(resp.TransferEncoding):
-		resp.Body = &body{Reader: newChunkedReader(r), resp: resp, r: r, closing: resp.Close}
+		resp.Body = &body{Reader: newChunkedReader(r), th: resp, r: r, closing: resp.Close}
 	case resp.ContentLength >= 0:
 		resp.Body = &body{Reader: io.LimitReader(r, resp.ContentLength), closing: resp.Close}
 	default:
@@ -149,13 +149,13 @@ func ReadResponse(r *bufio.Reader, requestMethod string) (resp *Response, err os
 // and then reads the trailer if necessary.
 type body struct {
 	io.Reader
-	resp    *Response     // non-nil value means read trailer
+	th      interface{}   // non-nil (Response or Request) value means read trailer
 	r       *bufio.Reader // underlying wire-format reader for the trailer
 	closing bool          // is the connection to be closed after reading body?
 }
 
 func (b *body) Close() os.Error {
-	if b.resp == nil && b.closing {
+	if b.th == nil && b.closing {
 		// no trailer and closing the connection next.
 		// no point in reading to EOF.
 		return nil
@@ -172,7 +172,7 @@ func (b *body) Close() os.Error {
 		}
 		return err
 	}
-	if b.resp == nil { // not reading trailer
+	if b.th == nil { // not reading trailer
 		return nil
 	}