src/extensions/browser/api/sockets_tcp_server/tcp_server_socket_event_dispatcher.cc

   1 // Copyright 2014 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 "extensions/browser/api/sockets_tcp_server/tcp_server_socket_event_dispatcher.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "extensions/browser/api/socket/tcp_socket.h"
   9 #include "extensions/browser/event_router.h"
  10 #include "extensions/browser/extensions_browser_client.h"
  11 #include "net/base/net_errors.h"
  12
  13 namespace extensions {
  14 namespace core_api {
  15
  16 using content::BrowserThread;
  17
  18 static base::LazyInstance<
  19     BrowserContextKeyedAPIFactory<TCPServerSocketEventDispatcher> > g_factory =
  20     LAZY_INSTANCE_INITIALIZER;
  21
  22 // static
  23 BrowserContextKeyedAPIFactory<TCPServerSocketEventDispatcher>*
  24 TCPServerSocketEventDispatcher::GetFactoryInstance() {
  25   return g_factory.Pointer();
  26 }
  27
  28 // static
  29 TCPServerSocketEventDispatcher* TCPServerSocketEventDispatcher::Get(
  30     content::BrowserContext* context) {
  31   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  32
  33   return BrowserContextKeyedAPIFactory<TCPServerSocketEventDispatcher>::Get(
  34       context);
  35 }
  36
  37 TCPServerSocketEventDispatcher::TCPServerSocketEventDispatcher(
  38     content::BrowserContext* context)
  39     : thread_id_(Socket::kThreadId), browser_context_(context) {
  40   ApiResourceManager<ResumableTCPServerSocket>* server_manager =
  41       ApiResourceManager<ResumableTCPServerSocket>::Get(browser_context_);
  42   DCHECK(server_manager)
  43       << "There is no server socket manager. "
  44          "If this assertion is failing during a test, then it is likely that "
  45          "TestExtensionSystem is failing to provide an instance of "
  46          "ApiResourceManager<ResumableTCPServerSocket>.";
  47   server_sockets_ = server_manager->data_;
  48
  49   ApiResourceManager<ResumableTCPSocket>* client_manager =
  50       ApiResourceManager<ResumableTCPSocket>::Get(browser_context_);
  51   DCHECK(client_manager)
  52       << "There is no client socket manager. "
  53          "If this assertion is failing during a test, then it is likely that "
  54          "TestExtensionSystem is failing to provide an instance of "
  55          "ApiResourceManager<ResumableTCPSocket>.";
  56   client_sockets_ = client_manager->data_;
  57 }
  58
  59 TCPServerSocketEventDispatcher::~TCPServerSocketEventDispatcher() {}
  60
  61 TCPServerSocketEventDispatcher::AcceptParams::AcceptParams() {}
  62
  63 TCPServerSocketEventDispatcher::AcceptParams::~AcceptParams() {}
  64
  65 void TCPServerSocketEventDispatcher::OnServerSocketListen(
  66     const std::string& extension_id,
  67     int socket_id) {
  68   DCHECK_CURRENTLY_ON(thread_id_);
  69
  70   StartSocketAccept(extension_id, socket_id);
  71 }
  72
  73 void TCPServerSocketEventDispatcher::OnServerSocketResume(
  74     const std::string& extension_id,
  75     int socket_id) {
  76   DCHECK_CURRENTLY_ON(thread_id_);
  77
  78   StartSocketAccept(extension_id, socket_id);
  79 }
  80
  81 void TCPServerSocketEventDispatcher::StartSocketAccept(
  82     const std::string& extension_id,
  83     int socket_id) {
  84   DCHECK_CURRENTLY_ON(thread_id_);
  85
  86   AcceptParams params;
  87   params.thread_id = thread_id_;
  88   params.browser_context_id = browser_context_;
  89   params.extension_id = extension_id;
  90   params.server_sockets = server_sockets_;
  91   params.client_sockets = client_sockets_;
  92   params.socket_id = socket_id;
  93
  94   StartAccept(params);
  95 }
  96
  97 // static
  98 void TCPServerSocketEventDispatcher::StartAccept(const AcceptParams& params) {
  99   DCHECK_CURRENTLY_ON(params.thread_id);
 100
 101   ResumableTCPServerSocket* socket =
 102       params.server_sockets->Get(params.extension_id, params.socket_id);
 103   if (!socket) {
 104     // This can happen if the socket is closed while our callback is active.
 105     return;
 106   }
 107   DCHECK(params.extension_id == socket->owner_extension_id())
 108       << "Socket has wrong owner.";
 109
 110   // Don't start another accept if the socket has been paused.
 111   if (socket->paused())
 112     return;
 113
 114   socket->Accept(
 115       base::Bind(&TCPServerSocketEventDispatcher::AcceptCallback, params));
 116 }
 117
 118 // static
 119 void TCPServerSocketEventDispatcher::AcceptCallback(
 120     const AcceptParams& params,
 121     int result_code,
 122     net::TCPClientSocket* socket) {
 123   DCHECK_CURRENTLY_ON(params.thread_id);
 124
 125   if (result_code >= 0) {
 126     ResumableTCPSocket* client_socket =
 127         new ResumableTCPSocket(socket, params.extension_id, true);
 128     client_socket->set_paused(true);
 129     int client_socket_id = params.client_sockets->Add(client_socket);
 130
 131     // Dispatch "onAccept" event.
 132     sockets_tcp_server::AcceptInfo accept_info;
 133     accept_info.socket_id = params.socket_id;
 134     accept_info.client_socket_id = client_socket_id;
 135     scoped_ptr<base::ListValue> args =
 136         sockets_tcp_server::OnAccept::Create(accept_info);
 137     scoped_ptr<Event> event(
 138         new Event(sockets_tcp_server::OnAccept::kEventName, args.Pass()));
 139     PostEvent(params, event.Pass());
 140
 141     // Post a task to delay the "accept" until the socket is available, as
 142     // calling StartAccept at this point would error with ERR_IO_PENDING.
 143     BrowserThread::PostTask(
 144         params.thread_id,
 145         FROM_HERE,
 146         base::Bind(&TCPServerSocketEventDispatcher::StartAccept, params));
 147   } else {
 148     // Dispatch "onAcceptError" event but don't start another accept to avoid
 149     // potential infinite "accepts" if we have a persistent network error.
 150     sockets_tcp_server::AcceptErrorInfo accept_error_info;
 151     accept_error_info.socket_id = params.socket_id;
 152     accept_error_info.result_code = result_code;
 153     scoped_ptr<base::ListValue> args =
 154         sockets_tcp_server::OnAcceptError::Create(accept_error_info);
 155     scoped_ptr<Event> event(
 156         new Event(sockets_tcp_server::OnAcceptError::kEventName, args.Pass()));
 157     PostEvent(params, event.Pass());
 158
 159     // Since we got an error, the socket is now "paused" until the application
 160     // "resumes" it.
 161     ResumableTCPServerSocket* socket =
 162         params.server_sockets->Get(params.extension_id, params.socket_id);
 163     if (socket) {
 164       socket->set_paused(true);
 165     }
 166   }
 167 }
 168
 169 // static
 170 void TCPServerSocketEventDispatcher::PostEvent(const AcceptParams& params,
 171                                                scoped_ptr<Event> event) {
 172   DCHECK_CURRENTLY_ON(params.thread_id);
 173
 174   BrowserThread::PostTask(BrowserThread::UI,
 175                           FROM_HERE,
 176                           base::Bind(&DispatchEvent,
 177                                      params.browser_context_id,
 178                                      params.extension_id,
 179                                      base::Passed(event.Pass())));
 180 }
 181
 182 // static
 183 void TCPServerSocketEventDispatcher::DispatchEvent(
 184     void* browser_context_id,
 185     const std::string& extension_id,
 186     scoped_ptr<Event> event) {
 187   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 188
 189   content::BrowserContext* context =
 190       reinterpret_cast<content::BrowserContext*>(browser_context_id);
 191   if (!extensions::ExtensionsBrowserClient::Get()->IsValidContext(context))
 192     return;
 193   EventRouter* router = EventRouter::Get(context);
 194   if (router)
 195     router->DispatchEventToExtension(extension_id, event.Pass());
 196 }
 197
 198 }  // namespace core_api
 199 }  // namespace extensions