1 files changed, 183 insertions, 0 deletions
diff --git a/extensions/browser/api/sockets_udp/udp_socket_event_dispatcher.cc b/extensions/browser/api/sockets_udp/udp_socket_event_dispatcher.cc
new file mode 100644
index 0000000..e985dfb
--- /dev/null
+++ b/extensions/browser/api/sockets_udp/udp_socket_event_dispatcher.cc
@@ -0,0 +1,183 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "extensions/browser/api/sockets_udp/udp_socket_event_dispatcher.h"
+
+#include "extensions/browser/api/socket/udp_socket.h"
+#include "extensions/browser/event_router.h"
+#include "extensions/browser/extension_system.h"
+#include "extensions/browser/extensions_browser_client.h"
+#include "net/base/net_errors.h"
+
+namespace extensions {
+namespace core_api {
+
+using content::BrowserThread;
+
+static base::LazyInstance<
+    BrowserContextKeyedAPIFactory<UDPSocketEventDispatcher> > g_factory =
+    LAZY_INSTANCE_INITIALIZER;
+
+// static
+BrowserContextKeyedAPIFactory<UDPSocketEventDispatcher>*
+UDPSocketEventDispatcher::GetFactoryInstance() {
+  return g_factory.Pointer();
+}
+
+// static
+UDPSocketEventDispatcher* UDPSocketEventDispatcher::Get(
+    content::BrowserContext* context) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  return BrowserContextKeyedAPIFactory<UDPSocketEventDispatcher>::Get(context);
+}
+
+UDPSocketEventDispatcher::UDPSocketEventDispatcher(
+    content::BrowserContext* context)
+    : thread_id_(Socket::kThreadId), browser_context_(context) {
+  ApiResourceManager<ResumableUDPSocket>* manager =
+      ApiResourceManager<ResumableUDPSocket>::Get(browser_context_);
+  DCHECK(manager)
+      << "There is no socket manager. "
+         "If this assertion is failing during a test, then it is likely that "
+         "TestExtensionSystem is failing to provide an instance of "
+         "ApiResourceManager<ResumableUDPSocket>.";
+  sockets_ = manager->data_;
+}
+
+UDPSocketEventDispatcher::~UDPSocketEventDispatcher() {}
+
+UDPSocketEventDispatcher::ReceiveParams::ReceiveParams() {}
+
+UDPSocketEventDispatcher::ReceiveParams::~ReceiveParams() {}
+
+void UDPSocketEventDispatcher::OnSocketBind(const std::string& extension_id,
+                                            int socket_id) {
+  OnSocketResume(extension_id, socket_id);
+}
+
+void UDPSocketEventDispatcher::OnSocketResume(const std::string& extension_id,
+                                              int socket_id) {
+  DCHECK(BrowserThread::CurrentlyOn(thread_id_));
+
+  ReceiveParams params;
+  params.thread_id = thread_id_;
+  params.browser_context_id = browser_context_;
+  params.extension_id = extension_id;
+  params.sockets = sockets_;
+  params.socket_id = socket_id;
+
+  StartReceive(params);
+}
+
+/* static */
+void UDPSocketEventDispatcher::StartReceive(const ReceiveParams& params) {
+  DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
+
+  ResumableUDPSocket* socket =
+      params.sockets->Get(params.extension_id, params.socket_id);
+  if (socket == NULL) {
+    // This can happen if the socket is closed while our callback is active.
+    return;
+  }
+  DCHECK(params.extension_id == socket->owner_extension_id())
+      << "Socket has wrong owner.";
+
+  // Don't start another read if the socket has been paused.
+  if (socket->paused())
+    return;
+
+  int buffer_size = (socket->buffer_size() <= 0 ? 4096 : socket->buffer_size());
+  socket->RecvFrom(
+      buffer_size,
+      base::Bind(&UDPSocketEventDispatcher::ReceiveCallback, params));
+}
+
+/* static */
+void UDPSocketEventDispatcher::ReceiveCallback(
+    const ReceiveParams& params,
+    int bytes_read,
+    scoped_refptr<net::IOBuffer> io_buffer,
+    const std::string& address,
+    int port) {
+  DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
+
+  // If |bytes_read| == 0, the message contained no data.
+  // If |bytes_read| < 0, there was a network error, and |bytes_read| is a value
+  // from "net::ERR_".
+
+  if (bytes_read >= 0) {
+    // Dispatch "onReceive" event.
+    sockets_udp::ReceiveInfo receive_info;
+    receive_info.socket_id = params.socket_id;
+    receive_info.data = std::string(io_buffer->data(), bytes_read);
+    receive_info.remote_address = address;
+    receive_info.remote_port = port;
+    scoped_ptr<base::ListValue> args =
+        sockets_udp::OnReceive::Create(receive_info);
+    scoped_ptr<Event> event(
+        new Event(sockets_udp::OnReceive::kEventName, args.Pass()));
+    PostEvent(params, event.Pass());
+
+    // Post a task to delay the read until the socket is available, as
+    // calling StartReceive at this point would error with ERR_IO_PENDING.
+    BrowserThread::PostTask(
+        params.thread_id,
+        FROM_HERE,
+        base::Bind(&UDPSocketEventDispatcher::StartReceive, params));
+  } else if (bytes_read == net::ERR_IO_PENDING) {
+    // This happens when resuming a socket which already had an
+    // active "recv" callback.
+  } else {
+    // Dispatch "onReceiveError" event but don't start another read to avoid
+    // potential infinite reads if we have a persistent network error.
+    sockets_udp::ReceiveErrorInfo receive_error_info;
+    receive_error_info.socket_id = params.socket_id;
+    receive_error_info.result_code = bytes_read;
+    scoped_ptr<base::ListValue> args =
+        sockets_udp::OnReceiveError::Create(receive_error_info);
+    scoped_ptr<Event> event(
+        new Event(sockets_udp::OnReceiveError::kEventName, args.Pass()));
+    PostEvent(params, event.Pass());
+
+    // Since we got an error, the socket is now "paused" until the application
+    // "resumes" it.
+    ResumableUDPSocket* socket =
+        params.sockets->Get(params.extension_id, params.socket_id);
+    if (socket) {
+      socket->set_paused(true);
+    }
+  }
+}
+
+/* static */
+void UDPSocketEventDispatcher::PostEvent(const ReceiveParams& params,
+                                         scoped_ptr<Event> event) {
+  DCHECK(BrowserThread::CurrentlyOn(params.thread_id));
+
+  BrowserThread::PostTask(BrowserThread::UI,
+                          FROM_HERE,
+                          base::Bind(&DispatchEvent,
+                                     params.browser_context_id,
+                                     params.extension_id,
+                                     base::Passed(event.Pass())));
+}
+
+/*static*/
+void UDPSocketEventDispatcher::DispatchEvent(void* browser_context_id,
+                                             const std::string& extension_id,
+                                             scoped_ptr<Event> event) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+
+  content::BrowserContext* context =
+      reinterpret_cast<content::BrowserContext*>(browser_context_id);
+  if (!extensions::ExtensionsBrowserClient::Get()->IsValidContext(context))
+    return;
+  EventRouter* router = ExtensionSystem::Get(context)->event_router();
+  if (router)
+    router->DispatchEventToExtension(extension_id, event.Pass());
+}
+
+}  // namespace core_api
+}  // namespace extensions