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// Copyright 2015 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 "mojo/edk/system/routed_raw_channel.h"
#include <utility>
#include "base/bind.h"
#include "base/logging.h"
#include "mojo/edk/embedder/embedder_internal.h"
namespace mojo {
namespace edk {
namespace {
const uint64_t kInternalRouteId = 0;
}
RoutedRawChannel::PendingMessage::PendingMessage() {
}
RoutedRawChannel::PendingMessage::~PendingMessage() {
}
RoutedRawChannel::RoutedRawChannel(
ScopedPlatformHandle handle,
const base::Callback<void(RoutedRawChannel*)>& destruct_callback)
: channel_(RawChannel::Create(std::move(handle))),
destruct_callback_(destruct_callback) {
internal::g_io_thread_task_runner->PostTask(
FROM_HERE,
base::Bind(&RawChannel::Init, base::Unretained(channel_), this));
internal::g_io_thread_task_runner->PostTask(
FROM_HERE,
base::Bind(&RawChannel::EnsureLazyInitialized,
base::Unretained(channel_)));
}
void RoutedRawChannel::AddRoute(uint64_t route_id,
RawChannel::Delegate* delegate) {
DCHECK(internal::g_io_thread_task_runner->RunsTasksOnCurrentThread());
CHECK_NE(route_id, kInternalRouteId) << kInternalRouteId << " is reserved";
CHECK(routes_.find(route_id) == routes_.end());
routes_[route_id] = delegate;
for (size_t i = 0; i < pending_messages_.size();) {
MessageInTransit::View view(pending_messages_[i]->message.size(),
&pending_messages_[i]->message[0]);
if (view.route_id() == route_id) {
delegate->OnReadMessage(view, std::move(pending_messages_[i]->handles));
pending_messages_.erase(pending_messages_.begin() + i);
} else {
++i;
}
}
if (close_routes_.find(route_id) != close_routes_.end())
delegate->OnError(ERROR_READ_SHUTDOWN);
}
void RoutedRawChannel::RemoveRoute(uint64_t route_id) {
DCHECK(internal::g_io_thread_task_runner->RunsTasksOnCurrentThread());
// We don't check that routes_ contains route_id because it's possible for it
// to not have been added yet (i.e. it's waiting to be added later down the
// call stack).
routes_.erase(route_id);
// Only send a message to the other side to close the route if we hadn't
// received a close route message. Otherwise they would keep going back and
// forth.
if (close_routes_.find(route_id) != close_routes_.end()) {
close_routes_.erase(route_id);
} else if (channel_) {
// Default route id of 0 to reach the other side's RoutedRawChannel.
char message_data[sizeof(uint64_t)];
memcpy(&message_data[0], &route_id, sizeof(uint64_t));
scoped_ptr<MessageInTransit> message(new MessageInTransit(
MessageInTransit::Type::MESSAGE, arraysize(message_data),
message_data));
message->set_route_id(kInternalRouteId);
channel_->WriteMessage(std::move(message));
}
if (!channel_ && routes_.empty()) {
// PostTask to avoid reentrancy since the broker might be calling us.
base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
}
}
RoutedRawChannel::~RoutedRawChannel() {
DCHECK(!channel_);
destruct_callback_.Run(this);
}
void RoutedRawChannel::OnReadMessage(
const MessageInTransit::View& message_view,
ScopedPlatformHandleVectorPtr platform_handles) {
DCHECK(internal::g_io_thread_task_runner->RunsTasksOnCurrentThread());
// Note: normally, when a message arrives here we should find a corresponding
// entry for the RawChannel::Delegate with the given route_id. However it is
// possible that they just connected, and due to race conditions one side has
// connected and sent a message (and even closed) before the other side had a
// chance to register with this RoutedRawChannel. In that case, we must buffer
// all messages.
uint64_t route_id = message_view.route_id();
if (route_id == kInternalRouteId) {
if (message_view.num_bytes() != sizeof(uint64_t)) {
NOTREACHED() << "Invalid internal message in RoutedRawChannel." ;
return;
}
uint64_t closed_route = *static_cast<const uint64_t*>(message_view.bytes());
if (close_routes_.find(closed_route) != close_routes_.end()) {
NOTREACHED() << "Should only receive one ROUTE_CLOSED per route.";
return;
}
close_routes_.insert(closed_route);
if (routes_.find(closed_route) == routes_.end())
return; // This side hasn't connected yet.
routes_[closed_route]->OnError(ERROR_READ_SHUTDOWN);
return;
}
if (routes_.find(route_id) != routes_.end()) {
routes_[route_id]->OnReadMessage(message_view, std::move(platform_handles));
} else {
scoped_ptr<PendingMessage> msg(new PendingMessage);
msg->message.resize(message_view.total_size());
memcpy(&msg->message[0], message_view.main_buffer(),
message_view.total_size());
msg->handles = std::move(platform_handles);
pending_messages_.push_back(std::move(msg));
}
}
void RoutedRawChannel::OnError(Error error) {
DCHECK(internal::g_io_thread_task_runner->RunsTasksOnCurrentThread());
// Note: we must ensure we don't call RawChannel::Shutdown until after we've
// called OnError on each route's delegate.
for (auto it = routes_.begin(); it != routes_.end();) {
// The delegate might call RemoveRoute in their OnError implementation which
// would invalidate |it|. So increment it first.
auto cur_it = it++;
cur_it->second->OnError(error);
}
if (routes_.empty()) {
channel_->Shutdown();
channel_ = nullptr;
delete this;
return;
}
}
} // namespace edk
} // namespace mojo
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