resolve_proxy_msg_helper.cc revision ddb351dbec246cf1fab5ec20d2d5520909041de1 
1// Copyright (c) 2011 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "chrome/browser/net/resolve_proxy_msg_helper.h"
6
7#include "base/compiler_specific.h"
8#include "chrome/browser/profiles/profile.h"
9#include "content/common/child_process_messages.h"
10#include "net/base/net_errors.h"
11#include "net/url_request/url_request_context.h"
12#include "net/url_request/url_request_context_getter.h"
13
14ResolveProxyMsgHelper::ResolveProxyMsgHelper(net::ProxyService* proxy_service)
15    : proxy_service_(NULL),
16      ALLOW_THIS_IN_INITIALIZER_LIST(callback_(
17          this, &ResolveProxyMsgHelper::OnResolveProxyCompleted)),
18      proxy_service_override_(proxy_service) {
19}
20
21bool ResolveProxyMsgHelper::OnMessageReceived(const IPC::Message& message,
22                                              bool* message_was_ok) {
23  bool handled = true;
24  IPC_BEGIN_MESSAGE_MAP_EX(ResolveProxyMsgHelper, message, *message_was_ok)
25    IPC_MESSAGE_HANDLER_DELAY_REPLY(ChildProcessHostMsg_ResolveProxy,
26                                    OnResolveProxy)
27    IPC_MESSAGE_UNHANDLED(handled = false)
28  IPC_END_MESSAGE_MAP()
29  return handled;
30}
31
32void ResolveProxyMsgHelper::OnResolveProxy(const GURL& url,
33                                           IPC::Message* reply_msg) {
34  // Enqueue the pending request.
35  pending_requests_.push_back(PendingRequest(url, reply_msg));
36
37  // If nothing is in progress, start.
38  if (pending_requests_.size() == 1)
39    StartPendingRequest();
40}
41
42void ResolveProxyMsgHelper::OnResolveProxyCompleted(int result) {
43  CHECK(!pending_requests_.empty());
44
45  const PendingRequest& completed_req = pending_requests_.front();
46  ChildProcessHostMsg_ResolveProxy::WriteReplyParams(
47      completed_req.reply_msg, result, proxy_info_.ToPacString());
48  Send(completed_req.reply_msg);
49
50  // Clear the current (completed) request.
51  pending_requests_.pop_front();
52  proxy_service_ = NULL;
53
54  // Start the next request.
55  if (!pending_requests_.empty())
56    StartPendingRequest();
57}
58
59void ResolveProxyMsgHelper::StartPendingRequest() {
60  PendingRequest& req = pending_requests_.front();
61
62  // Verify the request wasn't started yet.
63  DCHECK(NULL == req.pac_req);
64  DCHECK(NULL == proxy_service_);
65
66  // Start the request.
67  bool ok = GetProxyService(&proxy_service_);
68
69  if (!ok) {
70    // During shutdown, there may be no ProxyService to use, because the
71    // default ChromeURLRequestContext has already been NULL-ed out.
72    LOG(WARNING) << "Failed getting default URLRequestContext";
73    OnResolveProxyCompleted(net::ERR_FAILED);
74    return;
75  }
76
77  int result = proxy_service_->ResolveProxy(
78      req.url, &proxy_info_, &callback_, &req.pac_req, net::BoundNetLog());
79
80  // Completed synchronously.
81  if (result != net::ERR_IO_PENDING)
82    OnResolveProxyCompleted(result);
83}
84
85bool ResolveProxyMsgHelper::GetProxyService(
86    scoped_refptr<net::ProxyService>* out) const {
87  // Unit-tests specify their own proxy service to use.
88  if (proxy_service_override_) {
89    *out = proxy_service_override_;
90    return true;
91  }
92
93  // If there is no default request context (say during shut down).
94  net::URLRequestContextGetter* context_getter =
95      Profile::GetDefaultRequestContext();
96  if (!context_getter)
97    return false;
98
99  // Otherwise use the browser's global proxy service.
100  *out = context_getter->GetURLRequestContext()->proxy_service();
101  return true;
102}
103
104ResolveProxyMsgHelper::~ResolveProxyMsgHelper() {
105  // Clear all pending requests.
106  if (!pending_requests_.empty()) {
107    PendingRequest req = pending_requests_.front();
108    proxy_service_->CancelPacRequest(req.pac_req);
109  }
110
111  for (PendingRequestList::iterator it = pending_requests_.begin();
112       it != pending_requests_.end();
113       ++it) {
114    delete it->reply_msg;
115  }
116
117  proxy_service_ = NULL;
118  pending_requests_.clear();
119}
120