/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013
* Jonathan Schleifer <js@webkeks.org>
*
* 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.
*/
#include "config.h"
#define __NO_EXT_QNX
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#import "OFStreamObserver.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFStream.h"
#import "OFDataArray.h"
#ifdef _WIN32
# import "OFTCPSocket.h"
#endif
#ifdef OF_HAVE_THREADS
# import "OFMutex.h"
#endif
#ifdef HAVE_KQUEUE
# import "OFStreamObserver_kqueue.h"
#endif
#ifdef HAVE_POLL_H
# import "OFStreamObserver_poll.h"
#endif
#if defined(HAVE_SYS_SELECT_H) || defined(_WIN32)
# import "OFStreamObserver_select.h"
#endif
#import "OFInitializationFailedException.h"
#import "OFOutOfRangeException.h"
#import "autorelease.h"
#import "macros.h"
enum {
QUEUE_ADD = 0,
QUEUE_REMOVE = 1,
QUEUE_READ = 0,
QUEUE_WRITE = 2
};
#define QUEUE_ACTION (QUEUE_ADD | QUEUE_REMOVE)
@implementation OFStreamObserver
+ (instancetype)observer
{
return [[[self alloc] init] autorelease];
}
#if defined(HAVE_KQUEUE)
+ alloc
{
if (self == [OFStreamObserver class])
return [OFStreamObserver_kqueue alloc];
return [super alloc];
}
#elif defined(HAVE_POLL_H)
+ alloc
{
if (self == [OFStreamObserver class])
return [OFStreamObserver_poll alloc];
return [super alloc];
}
#elif defined(HAVE_SYS_SELECT_H) || defined(_WIN32)
+ alloc
{
if (self == [OFStreamObserver class])
return [OFStreamObserver_select alloc];
return [super alloc];
}
#endif
- init
{
self = [super init];
@try {
#ifdef _WIN32
struct sockaddr_in cancelAddr2;
socklen_t cancelAddrLen;
#endif
_readStreams = [[OFMutableArray alloc] init];
_writeStreams = [[OFMutableArray alloc] init];
_queue = [[OFMutableArray alloc] init];
_queueInfo = [[OFDataArray alloc]
initWithItemSize: sizeof(int)];
_queueFDs = [[OFDataArray alloc] initWithItemSize: sizeof(int)];
#ifndef _WIN32
if (pipe(_cancelFD))
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
#else
/* Make sure WSAStartup has been called */
[OFTCPSocket class];
_cancelFD[0] = socket(AF_INET, SOCK_DGRAM, 0);
_cancelFD[1] = socket(AF_INET, SOCK_DGRAM, 0);
if (_cancelFD[0] == INVALID_SOCKET ||
_cancelFD[1] == INVALID_SOCKET)
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
_cancelAddr.sin_family = AF_INET;
_cancelAddr.sin_port = 0;
_cancelAddr.sin_addr.s_addr = inet_addr("127.0.0.1");
cancelAddr2 = _cancelAddr;
if (bind(_cancelFD[0], (struct sockaddr*)&_cancelAddr,
sizeof(_cancelAddr)) || bind(_cancelFD[1],
(struct sockaddr*)&cancelAddr2, sizeof(cancelAddr2)))
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
cancelAddrLen = sizeof(_cancelAddr);
if (getsockname(_cancelFD[0], (struct sockaddr*)&_cancelAddr,
&cancelAddrLen))
@throw [OFInitializationFailedException
exceptionWithClass: [self class]];
#endif
_maxFD = _cancelFD[0];
_FDToStream = [self allocMemoryWithSize: sizeof(OFStream*)
count: _maxFD + 1];
_FDToStream[_cancelFD[0]] = nil;
#ifdef OF_HAVE_THREADS
_mutex = [[OFMutex alloc] init];
#endif
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
close(_cancelFD[0]);
close(_cancelFD[1]);
[_readStreams release];
[_writeStreams release];
[_queue release];
[_queueInfo release];
[_queueFDs release];
#ifdef OF_HAVE_THREADS
[_mutex release];
#endif
[super dealloc];
}
- (id <OFStreamObserverDelegate>)delegate
{
return _delegate;
}
- (void)setDelegate: (id <OFStreamObserverDelegate>)delegate
{
_delegate = delegate;
}
- (void)addStreamForReading: (OFStream*)stream
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_ADD | QUEUE_READ;
int fd = [stream fileDescriptorForReading];
[_queue addObject: stream];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)addStreamForWriting: (OFStream*)stream
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_ADD | QUEUE_WRITE;
int fd = [stream fileDescriptorForWriting];
[_queue addObject: stream];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)removeStreamForReading: (OFStream*)stream
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_REMOVE | QUEUE_READ;
int fd = [stream fileDescriptorForReading];
[_queue addObject: stream];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)removeStreamForWriting: (OFStream*)stream
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
int qi = QUEUE_REMOVE | QUEUE_WRITE;
int fd = [stream fileDescriptorForWriting];
[_queue addObject: stream];
[_queueInfo addItem: &qi];
[_queueFDs addItem: &fd];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
[self cancel];
}
- (void)OF_addFileDescriptorForReading: (int)fd
{
[self doesNotRecognizeSelector: _cmd];
abort();
}
- (void)OF_addFileDescriptorForWriting: (int)fd
{
[self doesNotRecognizeSelector: _cmd];
abort();
}
- (void)OF_removeFileDescriptorForReading: (int)fd
{
[self doesNotRecognizeSelector: _cmd];
abort();
}
- (void)OF_removeFileDescriptorForWriting: (int)fd
{
[self doesNotRecognizeSelector: _cmd];
abort();
}
- (void)OF_processQueue
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
#endif
@try {
OFStream **queueObjects = [_queue objects];
int *queueInfoItems = [_queueInfo items];
int *queueFDsItems = [_queueFDs items];
size_t i, count = [_queue count];
for (i = 0; i < count; i++) {
OFStream *stream = queueObjects[i];
int action = queueInfoItems[i];
int fd = queueFDsItems[i];
if ((action & QUEUE_ACTION) == QUEUE_ADD) {
if (fd > _maxFD) {
_maxFD = fd;
_FDToStream = [self
resizeMemory: _FDToStream
size: sizeof(OFStream*)
count: _maxFD + 1];
}
_FDToStream[fd] = stream;
}
if ((action & QUEUE_ACTION) == QUEUE_REMOVE) {
/* FIXME: Maybe downsize? */
_FDToStream[fd] = nil;
}
switch (action) {
case QUEUE_ADD | QUEUE_READ:
[_readStreams addObject: stream];
[self OF_addFileDescriptorForReading: fd];
break;
case QUEUE_ADD | QUEUE_WRITE:
[_writeStreams addObject: stream];
[self OF_addFileDescriptorForWriting: fd];
break;
case QUEUE_REMOVE | QUEUE_READ:
[_readStreams removeObjectIdenticalTo: stream];
[self OF_removeFileDescriptorForReading: fd];
break;
case QUEUE_REMOVE | QUEUE_WRITE:
[_writeStreams removeObjectIdenticalTo: stream];
[self OF_removeFileDescriptorForWriting: fd];
break;
default:
assert(0);
}
}
[_queue removeAllObjects];
[_queueInfo removeAllItems];
[_queueFDs removeAllItems];
} @finally {
#ifdef OF_HAVE_THREADS
[_mutex unlock];
#endif
}
}
- (void)observe
{
[self observeWithTimeout: -1];
}
- (bool)observeWithTimeout: (double)timeout
{
[self doesNotRecognizeSelector: _cmd];
abort();
}
- (void)cancel
{
#ifndef _WIN32
OF_ENSURE(write(_cancelFD[1], "", 1) > 0);
#else
OF_ENSURE(sendto(_cancelFD[1], "", 1, 0, (struct sockaddr*)&_cancelAddr,
sizeof(_cancelAddr)) > 0);
#endif
}
- (bool)OF_processCache
{
OFStream **objects = [_readStreams objects];
size_t i, count = [_readStreams count];
bool foundInCache = false;
for (i = 0; i < count; i++) {
if ([objects[i] numberOfBytesInReadBuffer] > 0 &&
![objects[i] OF_isWaitingForDelimiter]) {
void *pool = objc_autoreleasePoolPush();
if ([_delegate respondsToSelector:
@selector(streamIsReadyForReading:)])
[_delegate streamIsReadyForReading: objects[i]];
foundInCache = true;
objc_autoreleasePoolPop(pool);
}
}
/*
* As long as we have data in the cache for any stream, we don't want
* to block.
*/
if (foundInCache)
return true;
return false;
}
@end