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// Copyright 2014 The Chromium Authors
// 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 <utility>
#include "base/containers/to_vector.h"
#include "base/functional/bind.h"
#include "base/lazy_instance.h"
#include "base/task/single_thread_task_runner.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/api/socket/udp_socket.h"
#include "extensions/browser/event_router.h"
#include "extensions/browser/extensions_browser_client.h"
#include "extensions/common/extension_id.h"
#include "net/base/net_errors.h"
namespace extensions {
namespace api {
using content::BrowserThread;
static base::LazyInstance<
BrowserContextKeyedAPIFactory<UDPSocketEventDispatcher>>::DestructorAtExit
g_factory = LAZY_INSTANCE_INITIALIZER;
// static
BrowserContextKeyedAPIFactory<UDPSocketEventDispatcher>*
UDPSocketEventDispatcher::GetFactoryInstance() {
return g_factory.Pointer();
}
// static
UDPSocketEventDispatcher* UDPSocketEventDispatcher::Get(
content::BrowserContext* context) {
DCHECK_CURRENTLY_ON(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() = default;
UDPSocketEventDispatcher::ReceiveParams::ReceiveParams() = default;
UDPSocketEventDispatcher::ReceiveParams::ReceiveParams(
const ReceiveParams& other) = default;
UDPSocketEventDispatcher::ReceiveParams::~ReceiveParams() = default;
void UDPSocketEventDispatcher::OnSocketBind(const ExtensionId& extension_id,
int socket_id) {
OnSocketResume(extension_id, socket_id);
}
void UDPSocketEventDispatcher::OnSocketResume(const ExtensionId& extension_id,
int socket_id) {
DCHECK_CURRENTLY_ON(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_CURRENTLY_ON(params.thread_id);
ResumableUDPSocket* socket =
params.sockets->Get(params.extension_id, params.socket_id);
if (socket == nullptr) {
// 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::BindOnce(&UDPSocketEventDispatcher::ReceiveCallback, params));
}
/* static */
void UDPSocketEventDispatcher::ReceiveCallback(
const ReceiveParams& params,
int bytes_read,
scoped_refptr<net::IOBuffer> io_buffer,
bool socket_destroying,
const std::string& address,
uint16_t port) {
DCHECK_CURRENTLY_ON(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 =
base::ToVector(io_buffer->first(static_cast<size_t>(bytes_read)));
receive_info.remote_address = address;
receive_info.remote_port = port;
auto args = sockets_udp::OnReceive::Create(receive_info);
std::unique_ptr<Event> event(new Event(events::SOCKETS_UDP_ON_RECEIVE,
sockets_udp::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.
base::SingleThreadTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&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 if (bytes_read == net::ERR_CONNECTION_CLOSED) {
// This happens when the socket closes, which is expected since we
// continually add a receive listener in the success block above.
} 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;
auto args = sockets_udp::OnReceiveError::Create(receive_error_info);
std::unique_ptr<Event> event(
new Event(events::SOCKETS_UDP_ON_RECEIVE_ERROR,
sockets_udp::OnReceiveError::kEventName, std::move(args)));
PostEvent(params, std::move(event));
// Do not try to access |socket| when we are destroying it.
if (!socket_destroying) {
// 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,
std::unique_ptr<Event> event) {
DCHECK_CURRENTLY_ON(params.thread_id);
content::GetUIThreadTaskRunner({})->PostTask(
FROM_HERE, base::BindOnce(&DispatchEvent, params.browser_context_id,
params.extension_id, std::move(event)));
}
/*static*/
void UDPSocketEventDispatcher::DispatchEvent(void* browser_context_id,
const ExtensionId& extension_id,
std::unique_ptr<Event> event) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!ExtensionsBrowserClient::Get()->IsValidContext(browser_context_id)) {
return;
}
content::BrowserContext* context =
reinterpret_cast<content::BrowserContext*>(browser_context_id);
EventRouter* router = EventRouter::Get(context);
if (router) {
#if BUILDFLAG(IS_CHROMEOS)
// Terminal app is the only non-extension to use sockets
// (crbug.com/1350479).
if (extension_id == kCrOSTerminal) {
router->DispatchEventToURL(GURL(extension_id), std::move(event));
return;
}
#endif
router->DispatchEventToExtension(extension_id, std::move(event));
}
}
} // namespace api
} // namespace extensions
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