src/chrome/browser/extensions/api/serial/serial_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/serial/serial_event_dispatcher.h"
   6
   7 #include "chrome/browser/browser_process.h"
   8 #include "chrome/browser/extensions/api/serial/serial_connection.h"
   9 #include "chrome/browser/profiles/profile.h"
  10 #include "chrome/browser/profiles/profile_manager.h"
  11 #include "extensions/browser/event_router.h"
  12
  13 namespace extensions {
  14
  15 namespace api {
  16
  17 namespace {
  18
  19 bool ShouldPauseOnReceiveError(serial::ReceiveError error) {
  20   return error == serial::RECEIVE_ERROR_DEVICE_LOST ||
  21       error == serial::RECEIVE_ERROR_SYSTEM_ERROR ||
  22       error == serial::RECEIVE_ERROR_DISCONNECTED;
  23 }
  24
  25 }  // namespace
  26
  27 static base::LazyInstance<BrowserContextKeyedAPIFactory<SerialEventDispatcher> >
  28     g_factory = LAZY_INSTANCE_INITIALIZER;
  29
  30 // static
  31 BrowserContextKeyedAPIFactory<SerialEventDispatcher>*
  32 SerialEventDispatcher::GetFactoryInstance() {
  33   return g_factory.Pointer();
  34 }
  35
  36 // static
  37 SerialEventDispatcher* SerialEventDispatcher::Get(
  38     content::BrowserContext* context) {
  39   return BrowserContextKeyedAPIFactory<SerialEventDispatcher>::Get(context);
  40 }
  41
  42 SerialEventDispatcher::SerialEventDispatcher(content::BrowserContext* context)
  43     : thread_id_(SerialConnection::kThreadId),
  44       profile_(Profile::FromBrowserContext(context)) {
  45   ApiResourceManager<SerialConnection>* manager =
  46       ApiResourceManager<SerialConnection>::Get(profile_);
  47   DCHECK(manager) << "No serial connection manager.";
  48   connections_ = manager->data_;
  49 }
  50
  51 SerialEventDispatcher::~SerialEventDispatcher() {}
  52
  53 SerialEventDispatcher::ReceiveParams::ReceiveParams() {}
  54
  55 SerialEventDispatcher::ReceiveParams::~ReceiveParams() {}
  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.profile_id = profile_;
  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(params.thread_id,
 124                           FROM_HERE,
 125                           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(
 134       BrowserThread::UI, FROM_HERE,
 135       base::Bind(&DispatchEvent,
 136                  params.profile_id,
 137                  params.extension_id,
 138                  base::Passed(event.Pass())));
 139 }
 140
 141 // static
 142 void SerialEventDispatcher::DispatchEvent(void* profile_id,
 143                                           const std::string& extension_id,
 144                                           scoped_ptr<extensions::Event> event) {
 145   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 146
 147   Profile* profile = reinterpret_cast<Profile*>(profile_id);
 148   if (!g_browser_process->profile_manager()->IsValidProfile(profile))
 149     return;
 150
 151   EventRouter* router = EventRouter::Get(profile);
 152   if (router)
 153     router->DispatchEventToExtension(extension_id, event.Pass());
 154 }
 155
 156 }  // namespace api
 157
 158 }  // namespace extensions