gecko-dev/ipc/unixsocket/SocketBase.h

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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*/
#ifndef mozilla_ipc_SocketBase_h
#define mozilla_ipc_SocketBase_h
#include "base/message_loop.h"
#include "nsAutoPtr.h"
namespace mozilla {
namespace ipc {
//
// UnixSocketBuffer
//
/**
* |UnixSocketBuffer| implements a FIFO buffer that stores raw socket
* data, either for sending on a socket or received from a socket.
*/
class UnixSocketBuffer
{
public:
virtual ~UnixSocketBuffer();
const uint8_t* GetData() const
{
return mData + mOffset;
}
size_t GetSize() const
{
return mSize - mOffset;
}
const uint8_t* Consume(size_t aLen);
nsresult Read(void* aValue, size_t aLen);
nsresult Read(int8_t& aValue)
{
return Read(&aValue, sizeof(aValue));
}
nsresult Read(uint8_t& aValue)
{
return Read(&aValue, sizeof(aValue));
}
nsresult Read(int16_t& aValue)
{
return Read(&aValue, sizeof(aValue));
}
nsresult Read(uint16_t& aValue)
{
return Read(&aValue, sizeof(aValue));
}
nsresult Read(int32_t& aValue)
{
return Read(&aValue, sizeof(aValue));
}
nsresult Read(uint32_t& aValue)
{
return Read(&aValue, sizeof(aValue));
}
uint8_t* Append(size_t aLen);
nsresult Write(const void* aValue, size_t aLen);
nsresult Write(int8_t aValue)
{
return Write(&aValue, sizeof(aValue));
}
nsresult Write(uint8_t aValue)
{
return Write(&aValue, sizeof(aValue));
}
nsresult Write(int16_t aValue)
{
return Write(&aValue, sizeof(aValue));
}
nsresult Write(uint16_t aValue)
{
return Write(&aValue, sizeof(aValue));
}
nsresult Write(int32_t aValue)
{
return Write(&aValue, sizeof(aValue));
}
nsresult Write(uint32_t aValue)
{
return Write(&aValue, sizeof(aValue));
}
protected:
UnixSocketBuffer();
/**
* Sets the raw memory. The caller is responsible for freeing
* this memory.
*
* @param aData A pointer to the buffer's raw memory.
* @param aOffset The start of valid bytes in |aData|.
* @param aSize The number of valid bytes in |aData|.
* @param aAvailableSpace The number of bytes in |aData|.
*/
void ResetBuffer(uint8_t* aData,
size_t aOffset, size_t aSize, size_t aAvailableSpace)
{
MOZ_ASSERT(aData || !aAvailableSpace);
MOZ_ASSERT((aOffset + aSize) <= aAvailableSpace);
mOffset = aOffset;
mSize = aSize;
mAvailableSpace = aAvailableSpace;
mData = aData;
}
/**
* Retrieves the memory buffer.
*
* @return A pointer to the buffer's raw memory.
*/
uint8_t* GetBuffer()
{
return mData;
}
size_t GetLeadingSpace() const
{
return mOffset;
}
size_t GetTrailingSpace() const
{
return mAvailableSpace - mSize;
}
size_t GetAvailableSpace() const
{
return mAvailableSpace;
}
void* GetTrailingBytes()
{
return mData + mSize;
}
uint8_t* GetData(size_t aOffset)
{
MOZ_ASSERT(aOffset <= mSize);
return mData + aOffset;
}
void SetRange(size_t aOffset, size_t aSize)
{
MOZ_ASSERT((aOffset + aSize) <= mAvailableSpace);
mOffset = aOffset;
mSize = mOffset + aSize;
}
void CleanupLeadingSpace();
private:
size_t mSize;
size_t mOffset;
size_t mAvailableSpace;
uint8_t* mData;
};
//
// UnixSocketIOBuffer
//
/**
* |UnixSocketIOBuffer| is a |UnixSocketBuffer| that supports being
* received on a socket or being send on a socket. Network protocols
* might differ in their exact usage of Unix socket functions and
* |UnixSocketIOBuffer| provides a protocol-neutral interface.
*/
class UnixSocketIOBuffer : public UnixSocketBuffer
{
public:
UnixSocketIOBuffer();
virtual ~UnixSocketIOBuffer();
/**
* Receives data from aFd at the end of the buffer. The returned value
* is the number of newly received bytes, or 0 if the peer shut down
* its connection, or a negative value on errors.
*/
virtual ssize_t Receive(int aFd) = 0;
/**
* Sends data to aFd from the beginning of the buffer. The returned value
* is the number of bytes written, or a negative value on error.
*/
virtual ssize_t Send(int aFd) = 0;
};
//
// UnixSocketRawData
//
class UnixSocketRawData final : public UnixSocketIOBuffer
{
public:
/**
* This constructor copies aData of aSize bytes length into the
* new instance of |UnixSocketRawData|.
*
* @param aData The buffer to copy.
* @param aSize The number of bytes in |aData|.
*/
UnixSocketRawData(const void* aData, size_t aSize);
/**
* This constructor reserves aSize bytes of space. Currently
* it's only possible to fill this buffer by calling |Receive|.
*
* @param aSize The number of bytes to allocate.
*/
UnixSocketRawData(size_t aSize);
/**
* The destructor releases the buffer's raw memory.
*/
~UnixSocketRawData();
/**
* Receives data from aFd at the end of the buffer. The returned value
* is the number of newly received bytes, or 0 if the peer shut down
* its connection, or a negative value on errors.
*/
ssize_t Receive(int aFd) override;
/**
* Sends data to aFd from the beginning of the buffer. The returned value
* is the number of bytes written, or a negative value on error.
*/
ssize_t Send(int aFd) override;
};
enum SocketConnectionStatus {
SOCKET_DISCONNECTED = 0,
SOCKET_LISTENING = 1,
SOCKET_CONNECTING = 2,
SOCKET_CONNECTED = 3
};
//
// SocketBase
//
class SocketBase
{
public:
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(SocketBase)
SocketConnectionStatus GetConnectionStatus() const;
int GetSuggestedConnectDelayMs() const;
/**
* Queues the internal representation of socket for deletion. Can be called
* from consumer thread.
*/
virtual void Close() = 0;
/**
* Callback for socket connect/accept success. Called after connect/accept has
* finished. Will be run on consumer thread before any reads take place.
*/
virtual void OnConnectSuccess() = 0;
/**
* Callback for socket connect/accept error. Will be run on consumer thread.
*/
virtual void OnConnectError() = 0;
/**
* Callback for socket disconnect. Will be run on consumer thread.
*/
virtual void OnDisconnect() = 0;
/**
* Called by implementation to notify consumer of success.
*/
void NotifySuccess();
/**
* Called by implementation to notify consumer of error.
*/
void NotifyError();
/**
* Called by implementation to notify consumer of disconnect.
*/
void NotifyDisconnect();
protected:
SocketBase();
virtual ~SocketBase();
void SetConnectionStatus(SocketConnectionStatus aConnectionStatus);
private:
uint32_t CalculateConnectDelayMs() const;
SocketConnectionStatus mConnectionStatus;
PRIntervalTime mConnectTimestamp;
uint32_t mConnectDelayMs;
};
//
// SocketIOBase
//
/**
* |SocketIOBase| is a base class for Socket I/O classes that
* perform operations on the I/O thread.
*/
class SocketIOBase
{
public:
virtual ~SocketIOBase();
/**
* Implemented by socket I/O classes to return the current instance of
* |SocketBase|.
*
* @return The current instance of |SocketBase|
*/
virtual SocketBase* GetSocketBase() = 0;
/**
* Implemented by socket I/O classes to signal that the socket I/O class has
* been shut down.
*
* @return True if the socket I/O class has been shut down, false otherwise.
*/
virtual bool IsShutdownOnIOThread() const = 0;
/**
* Implemented by socket I/O classes to signal that socket class has
* been shut down.
*
* @return True if the socket class has been shut down, false otherwise.
*/
virtual bool IsShutdownOnConsumerThread() const = 0;
/**
* Signals to the socket I/O classes that it has been shut down.
*/
virtual void ShutdownOnIOThread() = 0;
/**
* Signals to the socket I/O classes that the socket class has been
* shut down.
*/
virtual void ShutdownOnConsumerThread() = 0;
/**
* Returns the consumer thread.
*
* @return A pointer to the consumer thread.
*/
MessageLoop* GetConsumerThread() const;
/**
* @return True if the current thread is the consumer thread, or false
* otherwise.
*/
bool IsConsumerThread() const;
protected:
SocketIOBase(MessageLoop* aConsumerLoop);
private:
MessageLoop* mConsumerLoop;
};
//
// Socket tasks
//
/* |SocketTask| is a task for sending a message from
* the I/O thread to the consumer thread.
*/
template <typename T>
class SocketTask : public Task
{
public:
virtual ~SocketTask()
{ }
T* GetIO() const
{
return mIO;
}
protected:
SocketTask(T* aIO)
: mIO(aIO)
{
MOZ_ASSERT(aIO);
}
private:
T* mIO;
};
/**
* |SocketEventTask| reports the connection state on the
* I/O thread back to the consumer thread.
*/
class SocketEventTask final : public SocketTask<SocketIOBase>
{
public:
enum SocketEvent {
CONNECT_SUCCESS,
CONNECT_ERROR,
DISCONNECT
};
SocketEventTask(SocketIOBase* aIO, SocketEvent aEvent);
~SocketEventTask();
void Run() override;
private:
SocketEvent mEvent;
};
/**
* |SocketRequestClosingTask| closes an instance of |SocketBase|
* on the consumer thread.
*/
class SocketRequestClosingTask final : public SocketTask<SocketIOBase>
{
public:
SocketRequestClosingTask(SocketIOBase* aIO);
~SocketRequestClosingTask();
void Run() override;
};
/**
* |SocketDeleteInstanceTask| deletes an object on the consumer thread.
*/
class SocketDeleteInstanceTask final : public Task
{
public:
SocketDeleteInstanceTask(SocketIOBase* aIO);
~SocketDeleteInstanceTask();
void Run() override;
private:
nsAutoPtr<SocketIOBase> mIO;
};
//
// Socket I/O tasks
//
/* |SocketIOTask| holds a reference to a Socket I/O object. It's
* supposed to run on the I/O thread.
*/
template<typename Tio>
class SocketIOTask : public CancelableTask
{
public:
virtual ~SocketIOTask()
{ }
Tio* GetIO() const
{
return mIO;
}
void Cancel() override
{
mIO = nullptr;
}
bool IsCanceled() const
{
return !mIO;
}
protected:
SocketIOTask(Tio* aIO)
: mIO(aIO)
{
MOZ_ASSERT(mIO);
}
private:
Tio* mIO;
};
/**
* |SocketIOShutdownTask| signals shutdown to the socket I/O class on
* the I/O thread and sends it to the consumer thread for destruction.
*/
class SocketIOShutdownTask final : public SocketIOTask<SocketIOBase>
{
public:
SocketIOShutdownTask(SocketIOBase* aIO);
~SocketIOShutdownTask();
void Run() override;
};
}
}
#endif