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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/embedder/embedder.h"
#include "base/bind.h"
#include "base/location.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "mojo/embedder/platform_support.h"
#include "mojo/system/channel.h"
#include "mojo/system/channel_endpoint.h"
#include "mojo/system/core.h"
#include "mojo/system/entrypoints.h"
#include "mojo/system/message_in_transit.h"
#include "mojo/system/message_pipe_dispatcher.h"
#include "mojo/system/platform_handle_dispatcher.h"
#include "mojo/system/raw_channel.h"
namespace mojo {
namespace embedder {
// This is defined here (instead of a header file), since it's opaque to the
// outside world. But we need to define it before our (internal-only) functions
// that use it.
struct ChannelInfo {
ChannelInfo() {}
~ChannelInfo() {}
scoped_refptr<system::Channel> channel;
// May be null, in which case |DestroyChannelOnIOThread()| must be used (from
// the IO thread), instead of |DestroyChannel()|.
scoped_refptr<base::TaskRunner> io_thread_task_runner;
};
namespace {
// Helper for |CreateChannel...()|. (Note: May return null for some failures.)
scoped_refptr<system::Channel> MakeChannel(
system::Core* core,
ScopedPlatformHandle platform_handle,
scoped_refptr<system::ChannelEndpoint> channel_endpoint) {
DCHECK(platform_handle.is_valid());
// Create and initialize a |system::Channel|.
scoped_refptr<system::Channel> channel =
new system::Channel(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 scoped_refptr<system::Channel>();
}
// Once |Init()| has succeeded, we have to return |channel| (since
// |Shutdown()| will have to be called on it).
// Attach the endpoint.
system::MessageInTransit::EndpointId endpoint_id =
channel->AttachEndpoint(channel_endpoint);
if (endpoint_id == system::MessageInTransit::kInvalidEndpointId) {
// This means that, e.g., the other endpoint of the message pipe was closed
// first. But it's not necessarily an error per se.
DVLOG(2) << "Channel::AttachEndpoint() failed";
return channel;
}
CHECK_EQ(endpoint_id, system::Channel::kBootstrapEndpointId);
if (!channel->RunMessagePipeEndpoint(system::Channel::kBootstrapEndpointId,
system::Channel::kBootstrapEndpointId)) {
// Currently, there's no reason for this to fail.
NOTREACHED() << "Channel::RunMessagePipeEndpoint() failed";
return channel;
}
return channel;
}
void CreateChannelHelper(
system::Core* core,
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 =
MakeChannel(core, platform_handle.Pass(), channel_endpoint);
// Hand the channel back to the embedder.
if (callback_thread_task_runner.get()) {
callback_thread_task_runner->PostTask(
FROM_HERE, base::Bind(callback, channel_info.release()));
} else {
callback.Run(channel_info.release());
}
}
} // namespace
void Init(scoped_ptr<PlatformSupport> platform_support) {
system::entrypoints::SetCore(new system::Core(platform_support.Pass()));
}
// 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);
system::Core* core = system::entrypoints::GetCore();
DCHECK(core);
ScopedMessagePipeHandle rv(
MessagePipeHandle(core->AddDispatcher(dispatcher)));
*channel_info = new ChannelInfo();
(*channel_info)->channel =
MakeChannel(core, 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());
scoped_refptr<system::ChannelEndpoint> channel_endpoint;
scoped_refptr<system::MessagePipeDispatcher> dispatcher =
system::MessagePipeDispatcher::CreateRemoteMessagePipe(&channel_endpoint);
system::Core* core = system::entrypoints::GetCore();
DCHECK(core);
ScopedMessagePipeHandle rv(
MessagePipeHandle(core->AddDispatcher(dispatcher)));
scoped_ptr<ChannelInfo> channel_info(new ChannelInfo());
channel_info->io_thread_task_runner = io_thread_task_runner;
if (rv.is_valid()) {
io_thread_task_runner->PostTask(FROM_HERE,
base::Bind(&CreateChannelHelper,
base::Unretained(core),
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();
}
void DestroyChannelOnIOThread(ChannelInfo* channel_info) {
DCHECK(channel_info);
if (!channel_info->channel.get()) {
// Presumably, |Init()| on the channel failed.
return;
}
channel_info->channel->Shutdown();
delete channel_info;
}
// TODO(vtl): Write tests for this.
void DestroyChannel(ChannelInfo* channel_info) {
DCHECK(channel_info);
DCHECK(channel_info->io_thread_task_runner.get());
if (!channel_info->channel.get()) {
// Presumably, |Init()| on the channel failed.
return;
}
channel_info->channel->WillShutdownSoon();
channel_info->io_thread_task_runner->PostTask(
FROM_HERE, base::Bind(&DestroyChannelOnIOThread, channel_info));
}
void WillDestroyChannelSoon(ChannelInfo* channel_info) {
DCHECK(channel_info);
channel_info->channel->WillShutdownSoon();
}
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()));
system::Core* core = system::entrypoints::GetCore();
DCHECK(core);
MojoHandle h = 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);
system::Core* core = system::entrypoints::GetCore();
DCHECK(core);
scoped_refptr<system::Dispatcher> dispatcher(
core->GetDispatcher(platform_handle_wrapper_handle));
if (!dispatcher.get())
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;
}
} // namespace embedder
} // namespace mojo
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