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// 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 "mojo/edk/embedder/embedder.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/message_loop/message_loop_proxy.h"
#include "mojo/edk/embedder/embedder_internal.h"
#include "mojo/edk/embedder/platform_support.h"
#include "mojo/edk/system/channel.h"
#include "mojo/edk/system/channel_endpoint.h"
#include "mojo/edk/system/channel_manager.h"
#include "mojo/edk/system/configuration.h"
#include "mojo/edk/system/core.h"
#include "mojo/edk/system/message_pipe_dispatcher.h"
#include "mojo/edk/system/platform_handle_dispatcher.h"
#include "mojo/edk/system/raw_channel.h"
namespace mojo {
namespace embedder {
namespace {
// Helper for |CreateChannel...()|. Returns 0 on failure. Called on the channel
// creation thread.
system::ChannelId MakeChannel(
ScopedPlatformHandle platform_handle,
scoped_refptr<system::ChannelEndpoint> channel_endpoint) {
DCHECK(platform_handle.is_valid());
// Create and initialize a |system::Channel|.
DCHECK(internal::g_core);
scoped_refptr<system::Channel> channel =
new system::Channel(internal::g_core->platform_support());
if (!channel->Init(system::RawChannel::Create(platform_handle.Pass()))) {
// This is very unusual (e.g., maybe |platform_handle| was invalid or we
// reached some system resource limit).
LOG(ERROR) << "Channel::Init() failed";
// Return null, since |Shutdown()| shouldn't be called in this case.
return 0;
}
channel->SetBootstrapEndpoint(channel_endpoint);
DCHECK(internal::g_channel_manager);
return internal::g_channel_manager->AddChannel(
channel, base::MessageLoopProxy::current());
}
// Helper for |CreateChannel()|. Called on the channel creation thread.
void CreateChannelHelper(
ScopedPlatformHandle platform_handle,
scoped_ptr<ChannelInfo> channel_info,
scoped_refptr<system::ChannelEndpoint> channel_endpoint,
DidCreateChannelCallback callback,
scoped_refptr<base::TaskRunner> callback_thread_task_runner) {
channel_info->channel_id =
MakeChannel(platform_handle.Pass(), channel_endpoint);
// Hand the channel back to the embedder.
if (callback_thread_task_runner) {
callback_thread_task_runner->PostTask(
FROM_HERE, base::Bind(callback, channel_info.release()));
} else {
callback.Run(channel_info.release());
}
}
} // namespace
namespace internal {
// Declared in embedder_internal.h.
system::Core* g_core = nullptr;
system::ChannelManager* g_channel_manager = nullptr;
} // namespace internal
void Init(scoped_ptr<PlatformSupport> platform_support) {
DCHECK(!internal::g_core);
internal::g_core = new system::Core(platform_support.Pass());
DCHECK(!internal::g_channel_manager);
internal::g_channel_manager = new system::ChannelManager();
}
Configuration* GetConfiguration() {
return system::GetMutableConfiguration();
}
// TODO(vtl): Write tests for this.
ScopedMessagePipeHandle CreateChannelOnIOThread(
ScopedPlatformHandle platform_handle,
ChannelInfo** channel_info) {
DCHECK(platform_handle.is_valid());
DCHECK(channel_info);
scoped_refptr<system::ChannelEndpoint> channel_endpoint;
scoped_refptr<system::MessagePipeDispatcher> dispatcher =
system::MessagePipeDispatcher::CreateRemoteMessagePipe(&channel_endpoint);
DCHECK(internal::g_core);
ScopedMessagePipeHandle rv(
MessagePipeHandle(internal::g_core->AddDispatcher(dispatcher)));
*channel_info =
new ChannelInfo(MakeChannel(platform_handle.Pass(), channel_endpoint));
return rv.Pass();
}
ScopedMessagePipeHandle CreateChannel(
ScopedPlatformHandle platform_handle,
scoped_refptr<base::TaskRunner> io_thread_task_runner,
DidCreateChannelCallback callback,
scoped_refptr<base::TaskRunner> callback_thread_task_runner) {
DCHECK(platform_handle.is_valid());
DCHECK(io_thread_task_runner);
DCHECK(!callback.is_null());
scoped_refptr<system::ChannelEndpoint> channel_endpoint;
scoped_refptr<system::MessagePipeDispatcher> dispatcher =
system::MessagePipeDispatcher::CreateRemoteMessagePipe(&channel_endpoint);
DCHECK(internal::g_core);
ScopedMessagePipeHandle rv(
MessagePipeHandle(internal::g_core->AddDispatcher(dispatcher)));
// We'll have to set |channel_info->channel_id| on the I/O thread.
scoped_ptr<ChannelInfo> channel_info(new ChannelInfo());
if (rv.is_valid()) {
io_thread_task_runner->PostTask(
FROM_HERE,
base::Bind(&CreateChannelHelper, base::Passed(&platform_handle),
base::Passed(&channel_info), channel_endpoint, callback,
callback_thread_task_runner));
} else {
(callback_thread_task_runner.get() ? callback_thread_task_runner
: io_thread_task_runner)
->PostTask(FROM_HERE, base::Bind(callback, channel_info.release()));
}
return rv.Pass();
}
// TODO(vtl): Write tests for this.
void DestroyChannel(ChannelInfo* channel_info) {
DCHECK(channel_info);
if (!channel_info->channel_id) {
// Presumably, |Init()| on the channel failed.
return;
}
DCHECK(internal::g_channel_manager);
// This will destroy the channel synchronously if called from the channel
// thread.
internal::g_channel_manager->ShutdownChannel(channel_info->channel_id);
delete channel_info;
}
void WillDestroyChannelSoon(ChannelInfo* channel_info) {
DCHECK(channel_info);
DCHECK(internal::g_channel_manager);
internal::g_channel_manager->WillShutdownChannel(channel_info->channel_id);
}
MojoResult CreatePlatformHandleWrapper(
ScopedPlatformHandle platform_handle,
MojoHandle* platform_handle_wrapper_handle) {
DCHECK(platform_handle_wrapper_handle);
scoped_refptr<system::Dispatcher> dispatcher(
new system::PlatformHandleDispatcher(platform_handle.Pass()));
DCHECK(internal::g_core);
MojoHandle h = internal::g_core->AddDispatcher(dispatcher);
if (h == MOJO_HANDLE_INVALID) {
LOG(ERROR) << "Handle table full";
dispatcher->Close();
return MOJO_RESULT_RESOURCE_EXHAUSTED;
}
*platform_handle_wrapper_handle = h;
return MOJO_RESULT_OK;
}
MojoResult PassWrappedPlatformHandle(MojoHandle platform_handle_wrapper_handle,
ScopedPlatformHandle* platform_handle) {
DCHECK(platform_handle);
DCHECK(internal::g_core);
scoped_refptr<system::Dispatcher> dispatcher(
internal::g_core->GetDispatcher(platform_handle_wrapper_handle));
if (!dispatcher)
return MOJO_RESULT_INVALID_ARGUMENT;
if (dispatcher->GetType() != system::Dispatcher::kTypePlatformHandle)
return MOJO_RESULT_INVALID_ARGUMENT;
*platform_handle =
static_cast<system::PlatformHandleDispatcher*>(dispatcher.get())
->PassPlatformHandle()
.Pass();
return MOJO_RESULT_OK;
}
MojoResult AsyncWait(MojoHandle handle,
MojoHandleSignals signals,
base::Callback<void(MojoResult)> callback) {
return internal::g_core->AsyncWait(handle, signals, callback);
}
} // namespace embedder
} // namespace mojo
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