src/extensions/browser/api/serial/serial_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/serial/serial_event_dispatcher.h"
   6
   7 #include "base/lazy_instance.h"
   8 #include "extensions/browser/api/serial/serial_connection.h"
   9 #include "extensions/browser/event_router.h"
  10 #include "extensions/browser/extensions_browser_client.h"
  11
  12 namespace extensions {
  13
  14 namespace core_api {
  15
  16 namespace {
  17
  18 bool ShouldPauseOnReceiveError(serial::ReceiveError error) {
  19   return error == serial::RECEIVE_ERROR_DEVICE_LOST ||
  20          error == serial::RECEIVE_ERROR_SYSTEM_ERROR ||
  21          error == serial::RECEIVE_ERROR_DISCONNECTED;
  22 }
  23
  24 }  // namespace
  25
  26 static base::LazyInstance<BrowserContextKeyedAPIFactory<SerialEventDispatcher> >
  27     g_factory = LAZY_INSTANCE_INITIALIZER;
  28
  29 // static
  30 BrowserContextKeyedAPIFactory<SerialEventDispatcher>*
  31 SerialEventDispatcher::GetFactoryInstance() {
  32   return g_factory.Pointer();
  33 }
  34
  35 // static
  36 SerialEventDispatcher* SerialEventDispatcher::Get(
  37     content::BrowserContext* context) {
  38   return BrowserContextKeyedAPIFactory<SerialEventDispatcher>::Get(context);
  39 }
  40
  41 SerialEventDispatcher::SerialEventDispatcher(content::BrowserContext* context)
  42     : thread_id_(SerialConnection::kThreadId), context_(context) {
  43   ApiResourceManager<SerialConnection>* manager =
  44       ApiResourceManager<SerialConnection>::Get(context_);
  45   DCHECK(manager) << "No serial connection manager.";
  46   connections_ = manager->data_;
  47 }
  48
  49 SerialEventDispatcher::~SerialEventDispatcher() {
  50 }
  51
  52 SerialEventDispatcher::ReceiveParams::ReceiveParams() {
  53 }
  54
  55 SerialEventDispatcher::ReceiveParams::~ReceiveParams() {
  56 }
  57
  58 void SerialEventDispatcher::PollConnection(const std::string& extension_id,
  59                                            int connection_id) {
  60   DCHECK_CURRENTLY_ON(thread_id_);
  61
  62   ReceiveParams params;
  63   params.thread_id = thread_id_;
  64   params.browser_context_id = context_;
  65   params.extension_id = extension_id;
  66   params.connections = connections_;
  67   params.connection_id = connection_id;
  68
  69   StartReceive(params);
  70 }
  71
  72 // static
  73 void SerialEventDispatcher::StartReceive(const ReceiveParams& params) {
  74   DCHECK_CURRENTLY_ON(params.thread_id);
  75
  76   SerialConnection* connection =
  77       params.connections->Get(params.extension_id, params.connection_id);
  78   if (!connection)
  79     return;
  80   DCHECK(params.extension_id == connection->owner_extension_id());
  81
  82   if (connection->paused())
  83     return;
  84
  85   connection->Receive(base::Bind(&ReceiveCallback, params));
  86 }
  87
  88 // static
  89 void SerialEventDispatcher::ReceiveCallback(const ReceiveParams& params,
  90                                             const std::string& data,
  91                                             serial::ReceiveError error) {
  92   DCHECK_CURRENTLY_ON(params.thread_id);
  93
  94   // Note that an error (e.g. timeout) does not necessarily mean that no data
  95   // was read, so we may fire an onReceive regardless of any error code.
  96   if (data.length() > 0) {
  97     serial::ReceiveInfo receive_info;
  98     receive_info.connection_id = params.connection_id;
  99     receive_info.data = data;
 100     scoped_ptr<base::ListValue> args = serial::OnReceive::Create(receive_info);
 101     scoped_ptr<extensions::Event> event(
 102         new extensions::Event(serial::OnReceive::kEventName, args.Pass()));
 103     PostEvent(params, event.Pass());
 104   }
 105
 106   if (error != serial::RECEIVE_ERROR_NONE) {
 107     serial::ReceiveErrorInfo error_info;
 108     error_info.connection_id = params.connection_id;
 109     error_info.error = error;
 110     scoped_ptr<base::ListValue> args =
 111         serial::OnReceiveError::Create(error_info);
 112     scoped_ptr<extensions::Event> event(
 113         new extensions::Event(serial::OnReceiveError::kEventName, args.Pass()));
 114     PostEvent(params, event.Pass());
 115     if (ShouldPauseOnReceiveError(error)) {
 116       SerialConnection* connection =
 117           params.connections->Get(params.extension_id, params.connection_id);
 118       if (connection)
 119         connection->set_paused(true);
 120     }
 121   }
 122
 123   // Queue up the next read operation.
 124   BrowserThread::PostTask(
 125       params.thread_id, FROM_HERE, base::Bind(&StartReceive, params));
 126 }
 127
 128 // static
 129 void SerialEventDispatcher::PostEvent(const ReceiveParams& params,
 130                                       scoped_ptr<extensions::Event> event) {
 131   DCHECK_CURRENTLY_ON(params.thread_id);
 132
 133   BrowserThread::PostTask(BrowserThread::UI,
 134                           FROM_HERE,
 135                           base::Bind(&DispatchEvent,
 136                                      params.browser_context_id,
 137                                      params.extension_id,
 138                                      base::Passed(event.Pass())));
 139 }
 140
 141 // static
 142 void SerialEventDispatcher::DispatchEvent(void* browser_context_id,
 143                                           const std::string& extension_id,
 144                                           scoped_ptr<extensions::Event> event) {
 145   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 146
 147   content::BrowserContext* context =
 148       reinterpret_cast<content::BrowserContext*>(browser_context_id);
 149   if (!extensions::ExtensionsBrowserClient::Get()->IsValidContext(context))
 150     return;
 151
 152   EventRouter* router = EventRouter::Get(context);
 153   if (router)
 154     router->DispatchEventToExtension(extension_id, event.Pass());
 155 }
 156
 157 }  // namespace core_api
 158
 159 }  // namespace extensions