| // 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_tcp/tcp_socket_event_dispatcher.h" |
| |
| #include <utility> |
| |
| #include "base/lazy_instance.h" |
| #include "extensions/browser/api/socket/tcp_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 { |
| int kDefaultBufferSize = 4096; |
| } |
| |
| namespace extensions { |
| namespace api { |
| |
| using content::BrowserThread; |
| |
| static base::LazyInstance< |
| BrowserContextKeyedAPIFactory<TCPSocketEventDispatcher> > g_factory = |
| LAZY_INSTANCE_INITIALIZER; |
| |
| // static |
| BrowserContextKeyedAPIFactory<TCPSocketEventDispatcher>* |
| TCPSocketEventDispatcher::GetFactoryInstance() { |
| return g_factory.Pointer(); |
| } |
| |
| // static |
| TCPSocketEventDispatcher* TCPSocketEventDispatcher::Get( |
| content::BrowserContext* context) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| |
| return BrowserContextKeyedAPIFactory<TCPSocketEventDispatcher>::Get(context); |
| } |
| |
| TCPSocketEventDispatcher::TCPSocketEventDispatcher( |
| content::BrowserContext* context) |
| : thread_id_(Socket::kThreadId), browser_context_(context) { |
| ApiResourceManager<ResumableTCPSocket>* manager = |
| ApiResourceManager<ResumableTCPSocket>::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<ResumableTCPSocket>."; |
| sockets_ = manager->data_; |
| } |
| |
| TCPSocketEventDispatcher::~TCPSocketEventDispatcher() {} |
| |
| TCPSocketEventDispatcher::ReadParams::ReadParams() {} |
| |
| TCPSocketEventDispatcher::ReadParams::ReadParams(const ReadParams& other) = |
| default; |
| |
| TCPSocketEventDispatcher::ReadParams::~ReadParams() {} |
| |
| void TCPSocketEventDispatcher::OnSocketConnect(const std::string& extension_id, |
| int socket_id) { |
| DCHECK_CURRENTLY_ON(thread_id_); |
| |
| StartSocketRead(extension_id, socket_id); |
| } |
| |
| void TCPSocketEventDispatcher::OnSocketResume(const std::string& extension_id, |
| int socket_id) { |
| DCHECK_CURRENTLY_ON(thread_id_); |
| |
| StartSocketRead(extension_id, socket_id); |
| } |
| |
| void TCPSocketEventDispatcher::StartSocketRead(const std::string& extension_id, |
| int socket_id) { |
| DCHECK_CURRENTLY_ON(thread_id_); |
| |
| ReadParams 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; |
| |
| StartRead(params); |
| } |
| |
| // static |
| void TCPSocketEventDispatcher::StartRead(const ReadParams& params) { |
| DCHECK_CURRENTLY_ON(params.thread_id); |
| |
| ResumableTCPSocket* socket = |
| params.sockets->Get(params.extension_id, params.socket_id); |
| if (!socket) { |
| // 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(); |
| if (buffer_size <= 0) |
| buffer_size = kDefaultBufferSize; |
| socket->Read(buffer_size, |
| base::Bind(&TCPSocketEventDispatcher::ReadCallback, params)); |
| } |
| |
| // static |
| void TCPSocketEventDispatcher::ReadCallback( |
| const ReadParams& params, |
| int bytes_read, |
| scoped_refptr<net::IOBuffer> io_buffer) { |
| DCHECK_CURRENTLY_ON(params.thread_id); |
| |
| // If |bytes_read| == 0, the connection has been closed by the peer. |
| // If |bytes_read| < 0, there was a network error, and |bytes_read| is a value |
| // from "net::ERR_". |
| |
| if (bytes_read == 0) { |
| bytes_read = net::ERR_CONNECTION_CLOSED; |
| } |
| |
| if (bytes_read > 0) { |
| // Dispatch "onReceive" event. |
| sockets_tcp::ReceiveInfo receive_info; |
| receive_info.socket_id = params.socket_id; |
| receive_info.data.assign(io_buffer->data(), io_buffer->data() + bytes_read); |
| std::unique_ptr<base::ListValue> args = |
| sockets_tcp::OnReceive::Create(receive_info); |
| std::unique_ptr<Event> event(new Event(events::SOCKETS_TCP_ON_RECEIVE, |
| sockets_tcp::OnReceive::kEventName, |
| std::move(args))); |
| PostEvent(params, std::move(event)); |
| |
| // 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(&TCPSocketEventDispatcher::StartRead, params)); |
| } else if (bytes_read == net::ERR_IO_PENDING) { |
| // This happens when resuming a socket which already had an |
| // active "read" callback. |
| } else { |
| // Dispatch "onReceiveError" event but don't start another read to avoid |
| // potential infinite reads if we have a persistent network error. |
| sockets_tcp::ReceiveErrorInfo receive_error_info; |
| receive_error_info.socket_id = params.socket_id; |
| receive_error_info.result_code = bytes_read; |
| std::unique_ptr<base::ListValue> args = |
| sockets_tcp::OnReceiveError::Create(receive_error_info); |
| std::unique_ptr<Event> event( |
| new Event(events::SOCKETS_TCP_ON_RECEIVE_ERROR, |
| sockets_tcp::OnReceiveError::kEventName, std::move(args))); |
| PostEvent(params, std::move(event)); |
| |
| // Since we got an error, the socket is now "paused" until the application |
| // "resumes" it. |
| ResumableTCPSocket* socket = |
| params.sockets->Get(params.extension_id, params.socket_id); |
| if (socket) { |
| socket->set_paused(true); |
| } |
| } |
| } |
| |
| // static |
| void TCPSocketEventDispatcher::PostEvent(const ReadParams& params, |
| std::unique_ptr<Event> event) { |
| DCHECK_CURRENTLY_ON(params.thread_id); |
| |
| BrowserThread::PostTask( |
| BrowserThread::UI, FROM_HERE, |
| base::Bind(&DispatchEvent, params.browser_context_id, params.extension_id, |
| base::Passed(std::move(event)))); |
| } |
| |
| // static |
| void TCPSocketEventDispatcher::DispatchEvent(void* browser_context_id, |
| const std::string& extension_id, |
| std::unique_ptr<Event> event) { |
| DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| |
| content::BrowserContext* context = |
| reinterpret_cast<content::BrowserContext*>(browser_context_id); |
| if (!extensions::ExtensionsBrowserClient::Get()->IsValidContext(context)) |
| return; |
| |
| EventRouter* event_router = EventRouter::Get(context); |
| if (event_router) |
| event_router->DispatchEventToExtension(extension_id, std::move(event)); |
| } |
| |
| } // namespace api |
| } // namespace extensions |