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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef ChildProcessProxy_h
#define ChildProcessProxy_h
#include "Connection.h"
#include "MessageReceiverMap.h"
#include "ProcessLauncher.h"
#include <wtf/ThreadSafeRefCounted.h>
namespace WebKit {
class ChildProcessProxy : ProcessLauncher::Client, public IPC::Connection::Client, public ThreadSafeRefCounted<ChildProcessProxy> {
WTF_MAKE_NONCOPYABLE(ChildProcessProxy);
public:
ChildProcessProxy();
virtual ~ChildProcessProxy();
// FIXME: This function does an unchecked upcast, and it is only used in a deprecated code path. Would like to get rid of it.
static ChildProcessProxy* fromConnection(IPC::Connection*);
void connect();
void terminate();
template<typename T> bool send(T&& message, uint64_t destinationID, unsigned messageSendFlags = 0);
template<typename T> bool sendSync(T&& message, typename T::Reply&&, uint64_t destinationID, std::chrono::milliseconds timeout = std::chrono::seconds(1), unsigned sendSyncFlags = 0);
IPC::Connection* connection() const
{
ASSERT(m_connection);
return m_connection.get();
}
void addMessageReceiver(IPC::StringReference messageReceiverName, IPC::MessageReceiver&);
void addMessageReceiver(IPC::StringReference messageReceiverName, uint64_t destinationID, IPC::MessageReceiver&);
void removeMessageReceiver(IPC::StringReference messageReceiverName, uint64_t destinationID);
void removeMessageReceiver(IPC::StringReference messageReceiverName);
enum class State {
Launching,
Running,
Terminated,
};
State state() const;
PlatformProcessIdentifier processIdentifier() const { return m_processLauncher->processIdentifier(); }
bool canSendMessage() const { return state() != State::Terminated;}
bool sendMessage(std::unique_ptr<IPC::MessageEncoder>, unsigned messageSendFlags);
void shutDownProcess();
protected:
// ProcessLauncher::Client
virtual void didFinishLaunching(ProcessLauncher*, IPC::Connection::Identifier) override;
bool dispatchMessage(IPC::Connection&, IPC::MessageDecoder&);
bool dispatchSyncMessage(IPC::Connection&, IPC::MessageDecoder&, std::unique_ptr<IPC::MessageEncoder>&);
virtual void getLaunchOptions(ProcessLauncher::LaunchOptions&);
private:
virtual void connectionWillOpen(IPC::Connection&);
virtual void processWillShutDown(IPC::Connection&) = 0;
Vector<std::pair<std::unique_ptr<IPC::MessageEncoder>, unsigned>> m_pendingMessages;
RefPtr<ProcessLauncher> m_processLauncher;
RefPtr<IPC::Connection> m_connection;
IPC::MessageReceiverMap m_messageReceiverMap;
};
template<typename T>
bool ChildProcessProxy::send(T&& message, uint64_t destinationID, unsigned messageSendFlags)
{
COMPILE_ASSERT(!T::isSync, AsyncMessageExpected);
auto encoder = std::make_unique<IPC::MessageEncoder>(T::receiverName(), T::name(), destinationID);
encoder->encode(message.arguments());
return sendMessage(WTFMove(encoder), messageSendFlags);
}
template<typename U>
bool ChildProcessProxy::sendSync(U&& message, typename U::Reply&& reply, uint64_t destinationID, std::chrono::milliseconds timeout, unsigned sendSyncFlags)
{
COMPILE_ASSERT(U::isSync, SyncMessageExpected);
if (!m_connection)
return false;
return connection()->sendSync(std::forward<U>(message), WTFMove(reply), destinationID, timeout, sendSyncFlags);
}
} // namespace WebKit
#endif // ChildProcessProxy_h
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