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