2011-03-17 00:05:44 +01:00
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// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package http
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import (
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"bufio"
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"crypto/tls"
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"encoding/base64"
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"fmt"
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2011-03-25 00:46:17 +01:00
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"io"
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"log"
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2011-03-17 00:05:44 +01:00
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"net"
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"os"
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"strings"
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"sync"
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)
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2011-03-25 00:46:17 +01:00
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// DefaultTransport is the default implementation of Transport and is
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// used by DefaultClient. It establishes a new network connection for
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// each call to Do and uses HTTP proxies as directed by the
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// $HTTP_PROXY and $NO_PROXY (or $http_proxy and $no_proxy)
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// environment variables.
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var DefaultTransport RoundTripper = &Transport{}
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// Transport is an implementation of RoundTripper that supports http,
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// https, and http proxies (for either http or https with CONNECT).
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// Transport can also cache connections for future re-use.
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type Transport struct {
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lk sync.Mutex
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idleConn map[string][]*persistConn
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// TODO: tunables on max cached connections (total, per-server), duration
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// TODO: optional pipelining
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IgnoreEnvironment bool // don't look at environment variables for proxy configuration
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DisableKeepAlives bool
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}
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// RoundTrip implements the RoundTripper interface.
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func (t *Transport) RoundTrip(req *Request) (resp *Response, err os.Error) {
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if req.URL == nil {
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if req.URL, err = ParseURL(req.RawURL); err != nil {
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return
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}
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}
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2011-03-17 00:05:44 +01:00
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if req.URL.Scheme != "http" && req.URL.Scheme != "https" {
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return nil, &badStringError{"unsupported protocol scheme", req.URL.Scheme}
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}
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2011-03-25 00:46:17 +01:00
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cm, err := t.connectMethodForRequest(req)
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if err != nil {
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return nil, err
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}
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// Get the cached or newly-created connection to either the
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// host (for http or https), the http proxy, or the http proxy
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// pre-CONNECTed to https server. In any case, we'll be ready
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// to send it requests.
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pconn, err := t.getConn(cm)
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if err != nil {
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return nil, err
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2011-03-17 00:05:44 +01:00
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}
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2011-03-25 00:46:17 +01:00
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return pconn.roundTrip(req)
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}
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// CloseIdleConnections closes any connections which were previously
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// connected from previous requests but are now sitting idle in
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// a "keep-alive" state. It does not interrupt any connections currently
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// in use.
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func (t *Transport) CloseIdleConnections() {
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t.lk.Lock()
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defer t.lk.Unlock()
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if t.idleConn == nil {
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return
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}
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for _, conns := range t.idleConn {
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for _, pconn := range conns {
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pconn.close()
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2011-03-17 00:05:44 +01:00
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}
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}
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2011-03-25 00:46:17 +01:00
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t.idleConn = nil
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}
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2011-03-17 00:05:44 +01:00
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2011-03-25 00:46:17 +01:00
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//
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// Private implementation past this point.
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//
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func (t *Transport) getenvEitherCase(k string) string {
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if t.IgnoreEnvironment {
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return ""
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}
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if v := t.getenv(strings.ToUpper(k)); v != "" {
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return v
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}
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return t.getenv(strings.ToLower(k))
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}
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func (t *Transport) getenv(k string) string {
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if t.IgnoreEnvironment {
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return ""
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}
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return os.Getenv(k)
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}
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func (t *Transport) connectMethodForRequest(req *Request) (*connectMethod, os.Error) {
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cm := &connectMethod{
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targetScheme: req.URL.Scheme,
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targetAddr: canonicalAddr(req.URL),
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}
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proxy := t.getenvEitherCase("HTTP_PROXY")
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if proxy != "" && t.useProxy(cm.targetAddr) {
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proxyURL, err := ParseRequestURL(proxy)
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2011-03-17 00:05:44 +01:00
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if err != nil {
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return nil, os.ErrorString("invalid proxy address")
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}
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if proxyURL.Host == "" {
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proxyURL, err = ParseRequestURL("http://" + proxy)
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if err != nil {
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return nil, os.ErrorString("invalid proxy address")
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}
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}
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2011-03-25 00:46:17 +01:00
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cm.proxyURL = proxyURL
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}
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return cm, nil
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}
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// proxyAuth returns the Proxy-Authorization header to set
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// on requests, if applicable.
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func (cm *connectMethod) proxyAuth() string {
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if cm.proxyURL == nil {
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return ""
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}
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proxyInfo := cm.proxyURL.RawUserinfo
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if proxyInfo != "" {
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enc := base64.URLEncoding
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encoded := make([]byte, enc.EncodedLen(len(proxyInfo)))
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enc.Encode(encoded, []byte(proxyInfo))
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return "Basic " + string(encoded)
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}
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return ""
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}
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func (t *Transport) putIdleConn(pconn *persistConn) {
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t.lk.Lock()
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defer t.lk.Unlock()
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if t.DisableKeepAlives {
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pconn.close()
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return
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}
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if pconn.isBroken() {
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return
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}
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key := pconn.cacheKey
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t.idleConn[key] = append(t.idleConn[key], pconn)
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}
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func (t *Transport) getIdleConn(cm *connectMethod) (pconn *persistConn) {
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t.lk.Lock()
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defer t.lk.Unlock()
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if t.idleConn == nil {
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t.idleConn = make(map[string][]*persistConn)
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}
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key := cm.String()
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for {
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pconns, ok := t.idleConn[key]
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if !ok {
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return nil
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}
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if len(pconns) == 1 {
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pconn = pconns[0]
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t.idleConn[key] = nil, false
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} else {
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// 2 or more cached connections; pop last
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// TODO: queue?
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pconn = pconns[len(pconns)-1]
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t.idleConn[key] = pconns[0 : len(pconns)-1]
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}
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if !pconn.isBroken() {
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return
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2011-03-17 00:05:44 +01:00
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}
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}
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2011-03-25 00:46:17 +01:00
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return
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}
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// getConn dials and creates a new persistConn to the target as
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// specified in the connectMethod. This includes doing a proxy CONNECT
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// and/or setting up TLS. If this doesn't return an error, the persistConn
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// is ready to write requests to.
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func (t *Transport) getConn(cm *connectMethod) (*persistConn, os.Error) {
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if pc := t.getIdleConn(cm); pc != nil {
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return pc, nil
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}
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2011-03-17 00:05:44 +01:00
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2011-03-30 17:33:16 +02:00
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conn, err := net.Dial("tcp", cm.addr())
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2011-03-17 00:05:44 +01:00
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if err != nil {
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return nil, err
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}
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2011-03-25 00:46:17 +01:00
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pa := cm.proxyAuth()
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2011-03-17 00:05:44 +01:00
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2011-03-25 00:46:17 +01:00
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pconn := &persistConn{
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t: t,
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cacheKey: cm.String(),
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conn: conn,
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reqch: make(chan requestAndChan, 50),
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}
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newClientConnFunc := NewClientConn
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switch {
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case cm.proxyURL == nil:
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// Do nothing.
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case cm.targetScheme == "http":
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newClientConnFunc = NewProxyClientConn
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if pa != "" {
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pconn.mutateRequestFunc = func(req *Request) {
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if req.Header == nil {
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req.Header = make(Header)
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}
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req.Header.Set("Proxy-Authorization", pa)
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2011-03-17 00:05:44 +01:00
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}
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}
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2011-03-25 00:46:17 +01:00
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case cm.targetScheme == "https":
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fmt.Fprintf(conn, "CONNECT %s HTTP/1.1\r\n", cm.targetAddr)
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fmt.Fprintf(conn, "Host: %s\r\n", cm.targetAddr)
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if pa != "" {
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fmt.Fprintf(conn, "Proxy-Authorization: %s\r\n", pa)
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}
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fmt.Fprintf(conn, "\r\n")
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2011-03-17 00:05:44 +01:00
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2011-03-25 00:46:17 +01:00
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// Read response.
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// Okay to use and discard buffered reader here, because
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// TLS server will not speak until spoken to.
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br := bufio.NewReader(conn)
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resp, err := ReadResponse(br, "CONNECT")
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if err != nil {
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conn.Close()
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return nil, err
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}
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if resp.StatusCode != 200 {
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f := strings.Split(resp.Status, " ", 2)
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conn.Close()
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return nil, os.ErrorString(f[1])
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}
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}
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if cm.targetScheme == "https" {
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2011-03-17 00:05:44 +01:00
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// Initiate TLS and check remote host name against certificate.
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conn = tls.Client(conn, nil)
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if err = conn.(*tls.Conn).Handshake(); err != nil {
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return nil, err
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}
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2011-03-25 00:46:17 +01:00
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if err = conn.(*tls.Conn).VerifyHostname(cm.tlsHost()); err != nil {
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return nil, err
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}
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2011-03-25 00:46:17 +01:00
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pconn.conn = conn
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2011-03-17 00:05:44 +01:00
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}
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2011-03-25 00:46:17 +01:00
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pconn.br = bufio.NewReader(pconn.conn)
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pconn.cc = newClientConnFunc(conn, pconn.br)
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pconn.cc.readRes = readResponseWithEOFSignal
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go pconn.readLoop()
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return pconn, nil
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}
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// useProxy returns true if requests to addr should use a proxy,
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// according to the NO_PROXY or no_proxy environment variable.
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func (t *Transport) useProxy(addr string) bool {
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if len(addr) == 0 {
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return true
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}
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no_proxy := t.getenvEitherCase("NO_PROXY")
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if no_proxy == "*" {
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return false
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}
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addr = strings.ToLower(strings.TrimSpace(addr))
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if hasPort(addr) {
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addr = addr[:strings.LastIndex(addr, ":")]
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}
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for _, p := range strings.Split(no_proxy, ",", -1) {
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p = strings.ToLower(strings.TrimSpace(p))
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if len(p) == 0 {
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continue
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}
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if hasPort(p) {
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p = p[:strings.LastIndex(p, ":")]
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}
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if addr == p || (p[0] == '.' && (strings.HasSuffix(addr, p) || addr == p[1:])) {
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return false
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}
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}
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return true
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}
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// connectMethod is the map key (in its String form) for keeping persistent
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// TCP connections alive for subsequent HTTP requests.
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//
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// A connect method may be of the following types:
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//
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// Cache key form Description
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// ----------------- -------------------------
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// ||http|foo.com http directly to server, no proxy
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// ||https|foo.com https directly to server, no proxy
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// http://proxy.com|https|foo.com http to proxy, then CONNECT to foo.com
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// http://proxy.com|http http to proxy, http to anywhere after that
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//
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// Note: no support to https to the proxy yet.
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//
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type connectMethod struct {
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proxyURL *URL // "" for no proxy, else full proxy URL
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targetScheme string // "http" or "https"
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targetAddr string // Not used if proxy + http targetScheme (4th example in table)
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}
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func (ck *connectMethod) String() string {
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proxyStr := ""
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if ck.proxyURL != nil {
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proxyStr = ck.proxyURL.String()
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}
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return strings.Join([]string{proxyStr, ck.targetScheme, ck.targetAddr}, "|")
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}
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// addr returns the first hop "host:port" to which we need to TCP connect.
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func (cm *connectMethod) addr() string {
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if cm.proxyURL != nil {
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return canonicalAddr(cm.proxyURL)
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}
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return cm.targetAddr
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}
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// tlsHost returns the host name to match against the peer's
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// TLS certificate.
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func (cm *connectMethod) tlsHost() string {
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h := cm.targetAddr
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if hasPort(h) {
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h = h[:strings.LastIndex(h, ":")]
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}
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return h
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}
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type readResult struct {
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res *Response // either res or err will be set
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err os.Error
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}
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type writeRequest struct {
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// Set by client (in pc.roundTrip)
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req *Request
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resch chan *readResult
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// Set by writeLoop if an error writing headers.
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writeErr os.Error
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}
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// persistConn wraps a connection, usually a persistent one
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// (but may be used for non-keep-alive requests as well)
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type persistConn struct {
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t *Transport
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cacheKey string // its connectMethod.String()
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conn net.Conn
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cc *ClientConn
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br *bufio.Reader
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reqch chan requestAndChan // written by roundTrip(); read by readLoop()
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mutateRequestFunc func(*Request) // nil or func to modify each outbound request
|
|
|
|
|
|
|
|
lk sync.Mutex // guards numExpectedResponses and broken
|
|
|
|
numExpectedResponses int
|
|
|
|
broken bool // an error has happened on this connection; marked broken so it's not reused.
|
|
|
|
}
|
|
|
|
|
|
|
|
func (pc *persistConn) isBroken() bool {
|
|
|
|
pc.lk.Lock()
|
|
|
|
defer pc.lk.Unlock()
|
|
|
|
return pc.broken
|
|
|
|
}
|
|
|
|
|
|
|
|
func (pc *persistConn) expectingResponse() bool {
|
|
|
|
pc.lk.Lock()
|
|
|
|
defer pc.lk.Unlock()
|
|
|
|
return pc.numExpectedResponses > 0
|
|
|
|
}
|
|
|
|
|
|
|
|
func (pc *persistConn) readLoop() {
|
|
|
|
alive := true
|
|
|
|
for alive {
|
|
|
|
pb, err := pc.br.Peek(1)
|
|
|
|
if err != nil {
|
|
|
|
if (err == os.EOF || err == os.EINVAL) && !pc.expectingResponse() {
|
|
|
|
// Remote side closed on us. (We probably hit their
|
|
|
|
// max idle timeout)
|
|
|
|
pc.close()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if !pc.expectingResponse() {
|
|
|
|
log.Printf("Unsolicited response received on idle HTTP channel starting with %q; err=%v",
|
|
|
|
string(pb), err)
|
|
|
|
pc.close()
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
rc := <-pc.reqch
|
|
|
|
resp, err := pc.cc.Read(rc.req)
|
|
|
|
if err == nil && !rc.req.Close {
|
|
|
|
pc.t.putIdleConn(pc)
|
|
|
|
}
|
|
|
|
if err == ErrPersistEOF {
|
|
|
|
// Succeeded, but we can't send any more
|
|
|
|
// persistent connections on this again. We
|
|
|
|
// hide this error to upstream callers.
|
|
|
|
alive = false
|
|
|
|
err = nil
|
|
|
|
} else if err != nil {
|
|
|
|
alive = false
|
|
|
|
}
|
|
|
|
rc.ch <- responseAndError{resp, err}
|
|
|
|
|
|
|
|
// Wait for the just-returned response body to be fully consumed
|
|
|
|
// before we race and peek on the underlying bufio reader.
|
|
|
|
if alive {
|
|
|
|
<-resp.Body.(*bodyEOFSignal).ch
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
type responseAndError struct {
|
|
|
|
res *Response
|
|
|
|
err os.Error
|
|
|
|
}
|
|
|
|
|
|
|
|
type requestAndChan struct {
|
|
|
|
req *Request
|
|
|
|
ch chan responseAndError
|
|
|
|
}
|
|
|
|
|
|
|
|
func (pc *persistConn) roundTrip(req *Request) (resp *Response, err os.Error) {
|
|
|
|
if pc.mutateRequestFunc != nil {
|
|
|
|
pc.mutateRequestFunc(req)
|
2011-03-17 00:05:44 +01:00
|
|
|
}
|
|
|
|
|
2011-03-25 00:46:17 +01:00
|
|
|
pc.lk.Lock()
|
|
|
|
pc.numExpectedResponses++
|
|
|
|
pc.lk.Unlock()
|
|
|
|
|
|
|
|
err = pc.cc.Write(req)
|
2011-03-17 00:05:44 +01:00
|
|
|
if err != nil {
|
2011-03-25 00:46:17 +01:00
|
|
|
pc.close()
|
|
|
|
return
|
2011-03-17 00:05:44 +01:00
|
|
|
}
|
|
|
|
|
2011-03-25 00:46:17 +01:00
|
|
|
ch := make(chan responseAndError, 1)
|
|
|
|
pc.reqch <- requestAndChan{req, ch}
|
|
|
|
re := <-ch
|
|
|
|
pc.lk.Lock()
|
|
|
|
pc.numExpectedResponses--
|
|
|
|
pc.lk.Unlock()
|
|
|
|
return re.res, re.err
|
|
|
|
}
|
|
|
|
|
|
|
|
func (pc *persistConn) close() {
|
|
|
|
pc.lk.Lock()
|
|
|
|
defer pc.lk.Unlock()
|
|
|
|
pc.broken = true
|
|
|
|
pc.cc.Close()
|
|
|
|
pc.conn.Close()
|
|
|
|
pc.mutateRequestFunc = nil
|
|
|
|
}
|
|
|
|
|
|
|
|
var portMap = map[string]string{
|
|
|
|
"http": "80",
|
|
|
|
"https": "443",
|
|
|
|
}
|
|
|
|
|
|
|
|
// canonicalAddr returns url.Host but always with a ":port" suffix
|
|
|
|
func canonicalAddr(url *URL) string {
|
|
|
|
addr := url.Host
|
|
|
|
if !hasPort(addr) {
|
|
|
|
return addr + ":" + portMap[url.Scheme]
|
|
|
|
}
|
|
|
|
return addr
|
|
|
|
}
|
|
|
|
|
|
|
|
func responseIsKeepAlive(res *Response) bool {
|
|
|
|
// TODO: implement. for now just always shutting down the connection.
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
// readResponseWithEOFSignal is a wrapper around ReadResponse that replaces
|
|
|
|
// the response body with a bodyEOFSignal-wrapped version.
|
|
|
|
func readResponseWithEOFSignal(r *bufio.Reader, requestMethod string) (resp *Response, err os.Error) {
|
|
|
|
resp, err = ReadResponse(r, requestMethod)
|
|
|
|
if err == nil {
|
|
|
|
resp.Body = &bodyEOFSignal{resp.Body, make(chan bool, 1), false}
|
|
|
|
}
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
// bodyEOFSignal wraps a ReadCloser but sends on ch once once
|
|
|
|
// the wrapped ReadCloser is fully consumed (including on Close)
|
|
|
|
type bodyEOFSignal struct {
|
|
|
|
body io.ReadCloser
|
|
|
|
ch chan bool
|
|
|
|
done bool
|
|
|
|
}
|
|
|
|
|
|
|
|
func (es *bodyEOFSignal) Read(p []byte) (n int, err os.Error) {
|
|
|
|
n, err = es.body.Read(p)
|
|
|
|
if err == os.EOF && !es.done {
|
|
|
|
es.ch <- true
|
|
|
|
es.done = true
|
|
|
|
}
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
func (es *bodyEOFSignal) Close() (err os.Error) {
|
|
|
|
err = es.body.Close()
|
|
|
|
if err == nil && !es.done {
|
|
|
|
es.ch <- true
|
|
|
|
es.done = true
|
|
|
|
}
|
2011-03-17 00:05:44 +01:00
|
|
|
return
|
|
|
|
}
|