/*
* Copyright (c) 2008-2021 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#import "OFObject.h"
#import "OFKernelEventObserver.h"
#import "OFRunLoop.h"
#import "socket.h"
OF_ASSUME_NONNULL_BEGIN
/** @file */
@class OFData;
@class OFSequencedPacketSocket;
#ifdef OF_HAVE_BLOCKS
/**
* @brief A block which is called when a packet has been received.
*
* @param length The length of the packet
* @param exception An exception which occurred while receiving or `nil` on
* success
* @return A bool whether the same block should be used for the next receive
*/
typedef bool (^OFSequencedPacketSocketAsyncReceiveBlock)(size_t length,
id _Nullable exception);
/**
* @brief A block which is called when a packet has been sent.
*
* @param data The data which was sent
* @param exception An exception which occurred while reading or `nil` on
* success
* @return The data to repeat the send with or nil if it should not repeat
*/
typedef OFData *_Nullable (^OFSequencedPacketSocketAsyncSendDataBlock)(
OFData *_Nonnull data, id _Nullable exception);
/**
* @brief A block which is called when the socket accepted a connection.
*
* @param acceptedSocket The socket which has been accepted
* @param exception An exception which occurred while accepting the socket or
* `nil` on success
* @return A bool whether the same block should be used for the next incoming
* connection
*/
typedef bool (^OFSequencedPacketSocketAsyncAcceptBlock)(
OFSequencedPacketSocket *acceptedSocket, id _Nullable exception);
#endif
/**
* @protocol OFSequencedPacketSocketDelegate OFSequencedPacketSocket.h \
* ObjFW/OFSequencedPacketSocket.h
*
* @brief A delegate for OFSequencedPacketSocket.
*/
@protocol OFSequencedPacketSocketDelegate <OFObject>
@optional
/**
* @brief This method is called when a packet has been received.
*
* @param socket The sequenced packet socket which received a packet
* @param buffer The buffer the packet has been written to
* @param length The length of the packet
* @param exception An exception that occurred while receiving, or nil on
* success
* @return A bool whether the same block should be used for the next receive
*/
- (bool)socket: (OFSequencedPacketSocket *)socket
didReceiveIntoBuffer: (void *)buffer
length: (size_t)length
exception: (nullable id)exception;
/**
* @brief This method is called when a packet has been sent.
*
* @param socket The sequenced packet socket which sent a packet
* @param data The data which was sent
* @param exception An exception that occurred while sending, or nil on success
* @return The data to repeat the send with or nil if it should not repeat
*/
- (nullable OFData *)socket: (OFSequencedPacketSocket *)socket
didSendData: (OFData *)data
exception: (nullable id)exception;
/**
* @brief A method which is called when a socket accepted a connection.
*
* @param socket The socket which accepted the connection
* @param acceptedSocket The socket which has been accepted
* @param exception An exception that occurred while accepting, or nil on
* success
* @return A bool whether to accept the next incoming connection
*/
- (bool)socket: (OFSequencedPacketSocket *)socket
didAcceptSocket: (OFSequencedPacketSocket *)acceptedSocket
exception: (nullable id)exception;
@end
/**
* @class OFSequencedPacketSocket OFSequencedPacketSocket.h \
* ObjFW/OFSequencedPacketSocket.h
*
* @brief A base class for sequenced packet sockets.
*
* @warning Even though the OFCopying protocol is implemented, it does *not*
* return an independent copy of the socket, but instead retains it.
* This is so that the socket can be used as a key for a dictionary,
* so context can be associated with a socket. Using a socket in more
* than one thread at the same time is not thread-safe, even if copy
* was called to create one "instance" for every thread!
*/
@interface OFSequencedPacketSocket: OFObject <OFCopying,
OFReadyForReadingObserving, OFReadyForWritingObserving>
{
OFSocketHandle _socket;
bool _canBlock, _listening;
OFSocketAddress _remoteAddress;
id _Nullable _delegate;
OF_RESERVE_IVARS(OFSequencedPacketSocket, 4)
}
/**
* @brief Whether the socket can block.
*
* By default, a socket can block.
*/
@property (nonatomic) bool canBlock;
/**
* @brief Whether the socket is a listening socket.
*/
@property (readonly, nonatomic, getter=isListening) bool listening;
/**
* @brief The remote address.
*
* @note This only works for accepted sockets!
*/
@property (readonly, nonatomic) const OFSocketAddress *remoteAddress;
/**
* @brief The delegate for asynchronous operations on the socket.
*
* @note The delegate is retained for as long as asynchronous operations are
* still ongoing.
*/
@property OF_NULLABLE_PROPERTY (assign, nonatomic)
id <OFSequencedPacketSocketDelegate> delegate;
/**
* @brief Returns a new, autoreleased OFSequencedPacketSocket.
*
* @return A new, autoreleased OFSequencedPacketSocket
*/
+ (instancetype)socket;
/**
* @brief Receives a packet and stores it into the specified buffer.
*
* If the buffer is too small, the receive operation fails.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
* @return The length of the received packet
*/
- (size_t)receiveIntoBuffer: (void *)buffer length: (size_t)length;
/**
* @brief Asynchronously receives a packet and stores it into the specified
* buffer.
*
* If the buffer is too small, the receive operation fails.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
*/
- (void)asyncReceiveIntoBuffer: (void *)buffer length: (size_t)length;
/**
* @brief Asynchronously receives a packet and stores it into the specified
* buffer.
*
* If the buffer is too small, the receive operation fails.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
* @param runLoopMode The run loop mode in which to perform the async receive
*/
- (void)asyncReceiveIntoBuffer: (void *)buffer
length: (size_t)length
runLoopMode: (OFRunLoopMode)runLoopMode;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Asynchronously receives a packet and stores it into the specified
* buffer.
*
* If the buffer is too small, the receive operation fails.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
* @param block The block to call when the packet has been received. If the
* block returns true, it will be called again with the same
* buffer and maximum length when more packets have been received.
* If you want the next method in the queue to handle the packet
* received next, you need to return false from the method.
*/
- (void)asyncReceiveIntoBuffer: (void *)buffer
length: (size_t)length
block: (OFSequencedPacketSocketAsyncReceiveBlock)block;
/**
* @brief Asynchronously receives a packet and stores it into the specified
* buffer.
*
* If the buffer is too small, the receive operation fails.
*
* @param buffer The buffer to write the packet to
* @param length The length of the buffer
* @param runLoopMode The run loop mode in which to perform the async receive
* @param block The block to call when the packet has been received. If the
* block returns true, it will be called again with the same
* buffer and maximum length when more packets have been received.
* If you want the next method in the queue to handle the packet
* received next, you need to return false from the method.
*/
- (void)asyncReceiveIntoBuffer: (void *)buffer
length: (size_t)length
runLoopMode: (OFRunLoopMode)runLoopMode
block: (OFSequencedPacketSocketAsyncReceiveBlock)block;
#endif
/**
* @brief Sends the specified packet.
*
* @param buffer The buffer to send as a packet
* @param length The length of the buffer
*/
- (void)sendBuffer: (const void *)buffer length: (size_t)length;
/**
* @brief Asynchronously sends the specified packet.
*
* @param data The data to send as a packet
*/
- (void)asyncSendData: (OFData *)data;
/**
* @brief Asynchronously sends the specified packet.
*
* @param data The data to send as a packet
* @param runLoopMode The run loop mode in which to perform the async send
*/
- (void)asyncSendData: (OFData *)data runLoopMode: (OFRunLoopMode)runLoopMode;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Asynchronously sends the specified packet.
*
* @param data The data to send as a packet
* @param block The block to call when the packet has been sent. It should
* return the data for the next send with the same callback or nil
* if it should not repeat.
*/
- (void)asyncSendData: (OFData *)data
block: (OFSequencedPacketSocketAsyncSendDataBlock)block;
/**
* @brief Asynchronously sends the specified packet.
*
* @param data The data to send as a packet
* @param runLoopMode The run loop mode in which to perform the async send
* @param block The block to call when the packet has been sent. It should
* return the data for the next send with the same callback or nil
* if it should not repeat.
*/
- (void)asyncSendData: (OFData *)data
runLoopMode: (OFRunLoopMode)runLoopMode
block: (OFSequencedPacketSocketAsyncSendDataBlock)block;
#endif
/**
* @brief Listen on the socket.
*
* @param backlog Maximum length for the queue of pending connections.
*/
- (void)listenWithBacklog: (int)backlog;
/**
* @brief Listen on the socket.
*/
- (void)listen;
/**
* @brief Accept an incoming connection.
*
* @return An autoreleased sequenced packet socket for the accepted connection.
*/
- (instancetype)accept;
/**
* @brief Asynchronously accept an incoming connection.
*/
- (void)asyncAccept;
/**
* @brief Asynchronously accept an incoming connection.
*
* @param runLoopMode The run loop mode in which to perform the async accept
*/
- (void)asyncAcceptWithRunLoopMode: (OFRunLoopMode)runLoopMode;
#ifdef OF_HAVE_BLOCKS
/**
* @brief Asynchronously accept an incoming connection.
*
* @param block The block to execute when a new connection has been accepted.
* Returns whether the next incoming connection should be accepted
* by the specified block as well.
*/
- (void)asyncAcceptWithBlock: (OFSequencedPacketSocketAsyncAcceptBlock)block;
/**
* @brief Asynchronously accept an incoming connection.
*
* @param runLoopMode The run loop mode in which to perform the async accept
* @param block The block to execute when a new connection has been accepted.
* Returns whether the next incoming connection should be accepted
* by the specified block as well.
*/
- (void)
asyncAcceptWithRunLoopMode: (OFRunLoopMode)runLoopMode
block: (OFSequencedPacketSocketAsyncAcceptBlock)block;
#endif
/**
* @brief Cancels all pending asynchronous requests on the socket.
*/
- (void)cancelAsyncRequests;
/**
* @brief Closes the socket so that it can neither receive nor send any more
* datagrams.
*/
- (void)close;
@end
OF_ASSUME_NONNULL_END