src/chrome/browser/extensions/api/sockets_udp/udp_socket_event_dispatcher.cc

   1 // Copyright 2013 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/extensions/api/sockets_udp/udp_socket_event_dispatcher.h"
   6
   7 #include "chrome/browser/browser_process.h"
   8 #include "chrome/browser/extensions/api/socket/udp_socket.h"
   9 #include "chrome/browser/extensions/event_router.h"
  10 #include "chrome/browser/extensions/extension_system.h"
  11 #include "chrome/browser/profiles/profile.h"
  12 #include "chrome/browser/profiles/profile_manager.h"
  13 #include "net/base/net_errors.h"
  14
  15 namespace extensions {
  16 namespace api {
  17
  18 using content::BrowserThread;
  19
  20 static base::LazyInstance<ProfileKeyedAPIFactory<UDPSocketEventDispatcher> >
  21 g_factory = LAZY_INSTANCE_INITIALIZER;
  22
  23 // static
  24 ProfileKeyedAPIFactory<UDPSocketEventDispatcher>*
  25     UDPSocketEventDispatcher::GetFactoryInstance() {
  26   return &g_factory.Get();
  27 }
  28
  29 // static
  30 UDPSocketEventDispatcher* UDPSocketEventDispatcher::Get(Profile* profile) {
  31   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
  32
  33   return ProfileKeyedAPIFactory<UDPSocketEventDispatcher>::GetForProfile(
  34       profile);
  35 }
  36
  37 UDPSocketEventDispatcher::UDPSocketEventDispatcher(Profile* profile)
  38     : thread_id_(Socket::kThreadId),
  39       profile_(profile) {
  40   ApiResourceManager<ResumableUDPSocket>* manager =
  41       ApiResourceManager<ResumableUDPSocket>::Get(profile);
  42   DCHECK(manager) << "There is no socket manager. "
  43     "If this assertion is failing during a test, then it is likely that "
  44     "TestExtensionSystem is failing to provide an instance of "
  45     "ApiResourceManager<ResumableUDPSocket>.";
  46   sockets_ = manager->data_;
  47 }
  48
  49 UDPSocketEventDispatcher::~UDPSocketEventDispatcher() {}
  50
  51 UDPSocketEventDispatcher::ReceiveParams::ReceiveParams() {}
  52
  53 UDPSocketEventDispatcher::ReceiveParams::~ReceiveParams() {}
  54
  55 void UDPSocketEventDispatcher::OnSocketBind(const std::string& extension_id,
  56                                             int socket_id) {
  57   DCHECK(BrowserThread::CurrentlyOn(thread_id_));
  58
  59   ReceiveParams params;
  60   params.thread_id = thread_id_;
  61   params.profile_id = profile_;
  62   params.extension_id = extension_id;
  63   params.sockets = sockets_;
  64   params.socket_id = socket_id;
  65
  66   StartReceive(params);
  67 }
  68
  69 /* static */
  70 void UDPSocketEventDispatcher::StartReceive(const ReceiveParams& params) {
  71   DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
  72
  73   ResumableUDPSocket* socket =
  74       params.sockets->Get(params.extension_id, params.socket_id);
  75   if (socket == NULL) {
  76     // This can happen if the socket is closed while our callback is active.
  77     return;
  78   }
  79   DCHECK(params.extension_id == socket->owner_extension_id())
  80     << "Socket has wrong owner.";
  81
  82   int buffer_size = (socket->buffer_size() <= 0 ? 4096 : socket->buffer_size());
  83   socket->RecvFrom(buffer_size,
  84                    base::Bind(&UDPSocketEventDispatcher::ReceiveCallback,
  85                    params));
  86 }
  87
  88 /* static */
  89 void UDPSocketEventDispatcher::ReceiveCallback(
  90     const ReceiveParams& params,
  91     int bytes_read,
  92     scoped_refptr<net::IOBuffer> io_buffer,
  93     const std::string& address,
  94     int port) {
  95   DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
  96
  97   // Note: if "bytes_read" < 0, there was a network error, and "bytes_read" is
  98   // a value from "net::ERR_".
  99
 100   if (bytes_read >= 0) {
 101     // Dispatch "onReceive" event.
 102     sockets_udp::ReceiveInfo receive_info;
 103     receive_info.socket_id = params.socket_id;
 104     receive_info.data = std::string(io_buffer->data(), bytes_read);
 105     receive_info.remote_address = address;
 106     receive_info.remote_port = port;
 107     scoped_ptr<base::ListValue> args =
 108         sockets_udp::OnReceive::Create(receive_info);
 109     scoped_ptr<Event> event(
 110       new Event(sockets_udp::OnReceive::kEventName, args.Pass()));
 111     PostEvent(params, event.Pass());
 112
 113     // Post a task to delay the read until the socket is available, as
 114     // calling StartReceive at this point would error with ERR_IO_PENDING.
 115     BrowserThread::PostTask(
 116         params.thread_id, FROM_HERE,
 117         base::Bind(&UDPSocketEventDispatcher::StartReceive, params));
 118   } else {
 119     // Dispatch "onReceiveError" event but don't start another read to avoid
 120     // potential infinite reads if we have a persistent network error.
 121     sockets_udp::ReceiveErrorInfo receive_error_info;
 122     receive_error_info.socket_id = params.socket_id;
 123     receive_error_info.result_code = bytes_read;
 124     scoped_ptr<base::ListValue> args =
 125         sockets_udp::OnReceiveError::Create(receive_error_info);
 126     scoped_ptr<Event> event(
 127       new Event(sockets_udp::OnReceiveError::kEventName, args.Pass()));
 128     PostEvent(params, event.Pass());
 129   }
 130 }
 131
 132 /* static */
 133 void UDPSocketEventDispatcher::PostEvent(const ReceiveParams& params,
 134                                          scoped_ptr<Event> event) {
 135   DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
 136
 137   BrowserThread::PostTask(
 138       BrowserThread::UI, FROM_HERE,
 139       base::Bind(&DispatchEvent,
 140                   params.profile_id,
 141                   params.extension_id,
 142                   base::Passed(event.Pass())));
 143 }
 144
 145 /*static*/
 146 void UDPSocketEventDispatcher::DispatchEvent(void* profile_id,
 147                                              const std::string& extension_id,
 148                                              scoped_ptr<Event> event) {
 149   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 150
 151   Profile* profile = reinterpret_cast<Profile*>(profile_id);
 152   if (!g_browser_process->profile_manager()->IsValidProfile(profile))
 153     return;
 154
 155   EventRouter* router = ExtensionSystem::Get(profile)->event_router();
 156   if (router)
 157     router->DispatchEventToExtension(extension_id, event.Pass());
 158 }
 159
 160 }  // namespace api
 161 }  // namespace extensions