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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.
#ifndef IPC_IPC_CHANNEL_MOJO_H_
#define IPC_IPC_CHANNEL_MOJO_H_
#include <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/component_export.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/task_runner.h"
#include "build/build_config.h"
#include "ipc/ipc.mojom.h"
#include "ipc/ipc_channel.h"
#include "ipc/ipc_channel_factory.h"
#include "ipc/ipc_message_pipe_reader.h"
#include "ipc/ipc_mojo_bootstrap.h"
namespace IPC {
class UrgentMessageObserver;
// Mojo-based IPC::Channel implementation over a Mojo message pipe.
//
// ChannelMojo builds a Mojo MessagePipe using the provided message pipe
// |handle| and builds an associated interface for each direction on the
// channel.
class COMPONENT_EXPORT(IPC) ChannelMojo
: public Channel,
public Channel::AssociatedInterfaceSupport,
public internal::MessagePipeReader::Delegate {
public:
// Creates a ChannelMojo.
static std::unique_ptr<ChannelMojo> Create(
mojo::ScopedMessagePipeHandle handle,
Mode mode,
Listener* listener,
const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner,
const scoped_refptr<base::SingleThreadTaskRunner>& proxy_task_runner);
// Create a factory object for ChannelMojo.
// The factory is used to create Mojo-based ChannelProxy family.
// |host| must not be null.
static std::unique_ptr<ChannelFactory> CreateServerFactory(
mojo::ScopedMessagePipeHandle handle,
const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner,
const scoped_refptr<base::SingleThreadTaskRunner>& proxy_task_runner);
static std::unique_ptr<ChannelFactory> CreateClientFactory(
mojo::ScopedMessagePipeHandle handle,
const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner,
const scoped_refptr<base::SingleThreadTaskRunner>& proxy_task_runner);
ChannelMojo(const ChannelMojo&) = delete;
ChannelMojo& operator=(const ChannelMojo&) = delete;
~ChannelMojo() override;
// Channel implementation
bool Connect() override;
void Pause() override;
void Unpause(bool flush) override;
void Flush() override;
void Close() override;
bool Send(Message* message) override;
Channel::AssociatedInterfaceSupport* GetAssociatedInterfaceSupport() override;
void SetUrgentMessageObserver(UrgentMessageObserver* observer) override;
// These access protected API of IPC::Message, which has ChannelMojo
// as a friend class.
static MojoResult WriteToMessageAttachmentSet(
std::optional<std::vector<mojo::native::SerializedHandlePtr>> handles,
Message* message);
static MojoResult ReadFromMessageAttachmentSet(
Message* message,
std::optional<std::vector<mojo::native::SerializedHandlePtr>>* handles);
// MessagePipeReader::Delegate
void OnPeerPidReceived(int32_t peer_pid) override;
void OnMessageReceived(const Message& message) override;
void OnBrokenDataReceived() override;
void OnPipeError() override;
void OnAssociatedInterfaceRequest(
mojo::GenericPendingAssociatedReceiver receiver) override;
private:
ChannelMojo(
mojo::ScopedMessagePipeHandle handle,
Mode mode,
Listener* listener,
const scoped_refptr<base::SingleThreadTaskRunner>& ipc_task_runner,
const scoped_refptr<base::SingleThreadTaskRunner>& proxy_task_runner);
void ForwardMessage(mojo::Message message);
// Channel::AssociatedInterfaceSupport:
std::unique_ptr<mojo::ThreadSafeForwarder<mojom::Channel>>
CreateThreadSafeChannel() override;
void AddGenericAssociatedInterface(
const std::string& name,
const GenericAssociatedInterfaceFactory& factory) override;
void GetRemoteAssociatedInterface(
mojo::GenericPendingAssociatedReceiver receiver) override;
void FinishConnectOnIOThread();
base::WeakPtr<ChannelMojo> weak_ptr_;
// A TaskRunner which runs tasks on the ChannelMojo's owning thread.
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
const mojo::MessagePipeHandle pipe_;
std::unique_ptr<MojoBootstrap> bootstrap_;
raw_ptr<Listener, DanglingUntriaged> listener_;
std::unique_ptr<internal::MessagePipeReader> message_reader_;
base::Lock associated_interface_lock_;
std::map<std::string, GenericAssociatedInterfaceFactory>
associated_interfaces_;
base::WeakPtrFactory<ChannelMojo> weak_factory_{this};
};
} // namespace IPC
#endif // IPC_IPC_CHANNEL_MOJO_H_
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