/
YYWebImageOperation.m
800 lines (727 loc) · 30.8 KB
/
YYWebImageOperation.m
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//
// YYWebImageOperation.m
// YYKit <https://github.com/ibireme/YYKit>
//
// Created by ibireme on 15/2/15.
// Copyright (c) 2015 ibireme.
//
// This source code is licensed under the MIT-style license found in the
// LICENSE file in the root directory of this source tree.
//
#import "YYWebImageOperation.h"
#import "UIApplication+YYAdd.h"
#import "YYImage.h"
#import "YYWeakProxy.h"
#import "UIImage+YYAdd.h"
#import <ImageIO/ImageIO.h>
#import "YYKitMacro.h"
#if __has_include("YYDispatchQueuePool.h")
#import "YYDispatchQueuePool.h"
#else
#import <libkern/OSAtomic.h>
#endif
#define MIN_PROGRESSIVE_TIME_INTERVAL 0.2
#define MIN_PROGRESSIVE_BLUR_TIME_INTERVAL 0.4
/// Returns YES if the right-bottom pixel is filled.
static BOOL YYCGImageLastPixelFilled(CGImageRef image) {
if (!image) return NO;
size_t width = CGImageGetWidth(image);
size_t height = CGImageGetHeight(image);
if (width == 0 || height == 0) return NO;
CGContextRef ctx = CGBitmapContextCreate(NULL, 1, 1, 8, 0, YYCGColorSpaceGetDeviceRGB(), kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrderDefault);
if (!ctx) return NO;
CGContextDrawImage(ctx, CGRectMake( -(int)width + 1, 0, width, height), image);
uint8_t *bytes = CGBitmapContextGetData(ctx);
BOOL isAlpha = bytes && bytes[0] == 0;
CFRelease(ctx);
return !isAlpha;
}
/// Returns JPEG SOS (Start Of Scan) Marker
static NSData *JPEGSOSMarker() {
// "Start Of Scan" Marker
static NSData *marker = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
uint8_t bytes[2] = {0xFF, 0xDA};
marker = [NSData dataWithBytes:bytes length:2];
});
return marker;
}
static NSMutableSet *URLBlacklist;
static dispatch_semaphore_t URLBlacklistLock;
static void URLBlacklistInit() {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
URLBlacklist = [NSMutableSet new];
URLBlacklistLock = dispatch_semaphore_create(1);
});
}
static BOOL URLBlackListContains(NSURL *url) {
if (!url || url == (id)[NSNull null]) return NO;
URLBlacklistInit();
dispatch_semaphore_wait(URLBlacklistLock, DISPATCH_TIME_FOREVER);
BOOL contains = [URLBlacklist containsObject:url];
dispatch_semaphore_signal(URLBlacklistLock);
return contains;
}
static void URLInBlackListAdd(NSURL *url) {
if (!url || url == (id)[NSNull null]) return;
URLBlacklistInit();
dispatch_semaphore_wait(URLBlacklistLock, DISPATCH_TIME_FOREVER);
[URLBlacklist addObject:url];
dispatch_semaphore_signal(URLBlacklistLock);
}
@interface YYWebImageOperation() <NSURLConnectionDelegate>
@property (readwrite, getter=isExecuting) BOOL executing;
@property (readwrite, getter=isFinished) BOOL finished;
@property (readwrite, getter=isCancelled) BOOL cancelled;
@property (readwrite, getter=isStarted) BOOL started;
@property (nonatomic, strong) NSRecursiveLock *lock;
@property (nonatomic, strong) NSURLConnection *connection;
@property (nonatomic, strong) NSMutableData *data;
@property (nonatomic, assign) NSInteger expectedSize;
@property (nonatomic, assign) UIBackgroundTaskIdentifier taskID;
@property (nonatomic, assign) NSTimeInterval lastProgressiveDecodeTimestamp;
@property (nonatomic, strong) YYImageDecoder *progressiveDecoder;
@property (nonatomic, assign) BOOL progressiveIgnored;
@property (nonatomic, assign) BOOL progressiveDetected;
@property (nonatomic, assign) NSUInteger progressiveScanedLength;
@property (nonatomic, assign) NSUInteger progressiveDisplayCount;
@property (nonatomic, copy) YYWebImageProgressBlock progress;
@property (nonatomic, copy) YYWebImageTransformBlock transform;
@property (nonatomic, copy) YYWebImageCompletionBlock completion;
@end
@implementation YYWebImageOperation
@synthesize executing = _executing;
@synthesize finished = _finished;
@synthesize cancelled = _cancelled;
/// Network thread entry point.
+ (void)_networkThreadMain:(id)object {
@autoreleasepool {
[[NSThread currentThread] setName:@"com.ibireme.yykit.webimage.request"];
NSRunLoop *runLoop = [NSRunLoop currentRunLoop];
[runLoop addPort:[NSMachPort port] forMode:NSDefaultRunLoopMode];
[runLoop run];
}
}
/// Global image request network thread, used by NSURLConnection delegate.
+ (NSThread *)_networkThread {
static NSThread *thread = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
thread = [[NSThread alloc] initWithTarget:self selector:@selector(_networkThreadMain:) object:nil];
if ([thread respondsToSelector:@selector(setQualityOfService:)]) {
thread.qualityOfService = NSQualityOfServiceBackground;
}
[thread start];
});
return thread;
}
/// Global image queue, used for image reading and decoding.
+ (dispatch_queue_t)_imageQueue {
#ifdef YYDispatchQueuePool_h
return YYDispatchQueueGetForQOS(NSQualityOfServiceUtility);
#else
#define MAX_QUEUE_COUNT 16
static int queueCount;
static dispatch_queue_t queues[MAX_QUEUE_COUNT];
static dispatch_once_t onceToken;
static int32_t counter = 0;
dispatch_once(&onceToken, ^{
queueCount = (int)[NSProcessInfo processInfo].activeProcessorCount;
queueCount = queueCount < 1 ? 1 : queueCount > MAX_QUEUE_COUNT ? MAX_QUEUE_COUNT : queueCount;
if ([UIDevice currentDevice].systemVersion.floatValue >= 8.0) {
for (NSUInteger i = 0; i < queueCount; i++) {
dispatch_queue_attr_t attr = dispatch_queue_attr_make_with_qos_class(DISPATCH_QUEUE_SERIAL, QOS_CLASS_UTILITY, 0);
queues[i] = dispatch_queue_create("com.ibireme.yykit.decode", attr);
}
} else {
for (NSUInteger i = 0; i < queueCount; i++) {
queues[i] = dispatch_queue_create("com.ibireme.yykit.decode", DISPATCH_QUEUE_SERIAL);
dispatch_set_target_queue(queues[i], dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_LOW, 0));
}
}
});
int32_t cur = OSAtomicIncrement32(&counter);
if (cur < 0) cur = -cur;
return queues[(cur) % queueCount];
#undef MAX_QUEUE_COUNT
#endif
}
- (instancetype)init {
@throw [NSException exceptionWithName:@"YYWebImageOperation init error" reason:@"YYWebImageOperation must be initialized with a request. Use the designated initializer to init." userInfo:nil];
return [self initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@""]] options:0 cache:nil cacheKey:nil progress:nil transform:nil completion:nil];
}
- (instancetype)initWithRequest:(NSURLRequest *)request
options:(YYWebImageOptions)options
cache:(YYImageCache *)cache
cacheKey:(NSString *)cacheKey
progress:(YYWebImageProgressBlock)progress
transform:(YYWebImageTransformBlock)transform
completion:(YYWebImageCompletionBlock)completion {
self = [super init];
if (!self) return nil;
if (!request) return nil;
_request = request;
_options = options;
_cache = cache;
_cacheKey = cacheKey ? cacheKey : request.URL.absoluteString;
_shouldUseCredentialStorage = YES;
_progress = progress;
_transform = transform;
_completion = completion;
_executing = NO;
_finished = NO;
_cancelled = NO;
_taskID = UIBackgroundTaskInvalid;
_lock = [NSRecursiveLock new];
return self;
}
- (void)dealloc {
[_lock lock];
if (_taskID != UIBackgroundTaskInvalid) {
[[UIApplication sharedExtensionApplication] endBackgroundTask:_taskID];
_taskID = UIBackgroundTaskInvalid;
}
if ([self isExecuting]) {
self.cancelled = YES;
self.finished = YES;
if (_connection) {
[_connection cancel];
if (![_request.URL isFileURL] && (_options & YYWebImageOptionShowNetworkActivity)) {
[[UIApplication sharedExtensionApplication] decrementNetworkActivityCount];
}
}
if (_completion) {
@autoreleasepool {
_completion(nil, _request.URL, YYWebImageFromNone, YYWebImageStageCancelled, nil);
}
}
}
[_lock unlock];
}
- (void)_endBackgroundTask {
[_lock lock];
if (_taskID != UIBackgroundTaskInvalid) {
[[UIApplication sharedExtensionApplication] endBackgroundTask:_taskID];
_taskID = UIBackgroundTaskInvalid;
}
[_lock unlock];
}
#pragma mark - Runs in operation thread
- (void)_finish {
self.executing = NO;
self.finished = YES;
[self _endBackgroundTask];
}
// runs on network thread
- (void)_startOperation {
if ([self isCancelled]) return;
@autoreleasepool {
// get image from cache
if (_cache &&
!(_options & YYWebImageOptionUseNSURLCache) &&
!(_options & YYWebImageOptionRefreshImageCache)) {
UIImage *image = [_cache getImageForKey:_cacheKey withType:YYImageCacheTypeMemory];
if (image) {
[_lock lock];
if (![self isCancelled]) {
if (_completion) _completion(image, _request.URL, YYWebImageFromMemoryCache, YYWebImageStageFinished, nil);
}
[self _finish];
[_lock unlock];
return;
}
if (!(_options & YYWebImageOptionIgnoreDiskCache)) {
__weak typeof(self) _self = self;
dispatch_async([self.class _imageQueue], ^{
__strong typeof(_self) self = _self;
if (!self || [self isCancelled]) return;
UIImage *image = [self.cache getImageForKey:self.cacheKey withType:YYImageCacheTypeDisk];
if (image) {
[self.cache setImage:image imageData:nil forKey:self.cacheKey withType:YYImageCacheTypeMemory];
[self performSelector:@selector(_didReceiveImageFromDiskCache:) onThread:[self.class _networkThread] withObject:image waitUntilDone:NO];
} else {
[self performSelector:@selector(_startRequest:) onThread:[self.class _networkThread] withObject:nil waitUntilDone:NO];
}
});
return;
}
}
}
[self performSelector:@selector(_startRequest:) onThread:[self.class _networkThread] withObject:nil waitUntilDone:NO];
}
// runs on network thread
- (void)_startRequest:(id)object {
if ([self isCancelled]) return;
@autoreleasepool {
if ((_options & YYWebImageOptionIgnoreFailedURL) && URLBlackListContains(_request.URL)) {
NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorFileDoesNotExist userInfo:@{ NSLocalizedDescriptionKey : @"Failed to load URL, blacklisted." }];
[_lock lock];
if (![self isCancelled]) {
if (_completion) _completion(nil, _request.URL, YYWebImageFromNone, YYWebImageStageFinished, error);
}
[self _finish];
[_lock unlock];
return;
}
if (_request.URL.isFileURL) {
NSArray *keys = @[NSURLFileSizeKey];
NSDictionary *attr = [_request.URL resourceValuesForKeys:keys error:nil];
NSNumber *fileSize = attr[NSURLFileSizeKey];
_expectedSize = (fileSize != nil) ? fileSize.unsignedIntegerValue : -1;
}
// request image from web
[_lock lock];
if (![self isCancelled]) {
_connection = [[NSURLConnection alloc] initWithRequest:_request delegate:[YYWeakProxy proxyWithTarget:self]];
if (![_request.URL isFileURL] && (_options & YYWebImageOptionShowNetworkActivity)) {
[[UIApplication sharedExtensionApplication] incrementNetworkActivityCount];
}
}
[_lock unlock];
}
}
// runs on network thread, called from outer "cancel"
- (void)_cancelOperation {
@autoreleasepool {
if (_connection) {
if (![_request.URL isFileURL] && (_options & YYWebImageOptionShowNetworkActivity)) {
[[UIApplication sharedExtensionApplication] decrementNetworkActivityCount];
}
}
[_connection cancel];
_connection = nil;
if (_completion) _completion(nil, _request.URL, YYWebImageFromNone, YYWebImageStageCancelled, nil);
[self _endBackgroundTask];
}
}
// runs on network thread
- (void)_didReceiveImageFromDiskCache:(UIImage *)image {
@autoreleasepool {
[_lock lock];
if (![self isCancelled]) {
if (image) {
if (_completion) _completion(image, _request.URL, YYWebImageFromDiskCache, YYWebImageStageFinished, nil);
[self _finish];
} else {
[self _startRequest:nil];
}
}
[_lock unlock];
}
}
- (void)_didReceiveImageFromWeb:(UIImage *)image {
@autoreleasepool {
[_lock lock];
if (![self isCancelled]) {
if (_cache) {
if (image || (_options & YYWebImageOptionRefreshImageCache)) {
NSData *data = _data;
dispatch_async([YYWebImageOperation _imageQueue], ^{
YYImageCacheType cacheType = (_options & YYWebImageOptionIgnoreDiskCache) ? YYImageCacheTypeMemory : YYImageCacheTypeAll;
[_cache setImage:image imageData:data forKey:_cacheKey withType:cacheType];
});
}
}
_data = nil;
NSError *error = nil;
if (!image) {
error = [NSError errorWithDomain:@"com.ibireme.yykit.image" code:-1 userInfo:@{ NSLocalizedDescriptionKey : @"Web image decode fail." }];
if (_options & YYWebImageOptionIgnoreFailedURL) {
if (URLBlackListContains(_request.URL)) {
error = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorFileDoesNotExist userInfo:@{ NSLocalizedDescriptionKey : @"Failed to load URL, blacklisted." }];
} else {
URLInBlackListAdd(_request.URL);
}
}
}
if (_completion) _completion(image, _request.URL, YYWebImageFromRemote, YYWebImageStageFinished, error);
[self _finish];
}
[_lock unlock];
}
}
#pragma mark - NSURLConnectionDelegate runs in operation thread
- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection {
return _shouldUseCredentialStorage;
}
- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge {
@autoreleasepool {
if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]) {
if (!(_options & YYWebImageOptionAllowInvalidSSLCertificates) &&
[challenge.sender respondsToSelector:@selector(performDefaultHandlingForAuthenticationChallenge:)]) {
[challenge.sender performDefaultHandlingForAuthenticationChallenge:challenge];
} else {
NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
[[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];
}
} else {
if ([challenge previousFailureCount] == 0) {
if (_credential) {
[[challenge sender] useCredential:_credential forAuthenticationChallenge:challenge];
} else {
[[challenge sender] continueWithoutCredentialForAuthenticationChallenge:challenge];
}
} else {
[[challenge sender] continueWithoutCredentialForAuthenticationChallenge:challenge];
}
}
}
}
- (NSCachedURLResponse *)connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {
if (!cachedResponse) return cachedResponse;
if (_options & YYWebImageOptionUseNSURLCache) {
return cachedResponse;
} else {
// ignore NSURLCache
return nil;
}
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
@autoreleasepool {
NSError *error = nil;
if ([response isKindOfClass:[NSHTTPURLResponse class]]) {
NSHTTPURLResponse *httpResponse = (id) response;
NSInteger statusCode = httpResponse.statusCode;
if (statusCode >= 400 || statusCode == 304) {
error = [NSError errorWithDomain:NSURLErrorDomain code:statusCode userInfo:nil];
}
}
if (error) {
[_connection cancel];
[self connection:_connection didFailWithError:error];
} else {
if (response.expectedContentLength) {
_expectedSize = (NSInteger)response.expectedContentLength;
if (_expectedSize < 0) _expectedSize = -1;
}
_data = [NSMutableData dataWithCapacity:_expectedSize > 0 ? _expectedSize : 0];
if (_progress) {
[_lock lock];
if (![self isCancelled]) _progress(0, _expectedSize);
[_lock unlock];
}
}
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
@autoreleasepool {
[_lock lock];
BOOL canceled = [self isCancelled];
[_lock unlock];
if (canceled) return;
if (data) [_data appendData:data];
if (_progress) {
[_lock lock];
if (![self isCancelled]) {
_progress(_data.length, _expectedSize);
}
[_lock unlock];
}
/*--------------------------- progressive ----------------------------*/
BOOL progressive = (_options & YYWebImageOptionProgressive) > 0;
BOOL progressiveBlur = (_options & YYWebImageOptionProgressiveBlur) > 0;
if (!_completion || !(progressive || progressiveBlur)) return;
if (data.length <= 16) return;
if (_expectedSize > 0 && data.length >= _expectedSize * 0.99) return;
if (_progressiveIgnored) return;
NSTimeInterval min = progressiveBlur ? MIN_PROGRESSIVE_BLUR_TIME_INTERVAL : MIN_PROGRESSIVE_TIME_INTERVAL;
NSTimeInterval now = CACurrentMediaTime();
if (now - _lastProgressiveDecodeTimestamp < min) return;
if (!_progressiveDecoder) {
_progressiveDecoder = [[YYImageDecoder alloc] initWithScale:[UIScreen mainScreen].scale];
}
[_progressiveDecoder updateData:_data final:NO];
if ([self isCancelled]) return;
if (_progressiveDecoder.type == YYImageTypeUnknown ||
_progressiveDecoder.type == YYImageTypeWebP ||
_progressiveDecoder.type == YYImageTypeOther) {
_progressiveDecoder = nil;
_progressiveIgnored = YES;
return;
}
if (progressiveBlur) { // only support progressive JPEG and interlaced PNG
if (_progressiveDecoder.type != YYImageTypeJPEG &&
_progressiveDecoder.type != YYImageTypePNG) {
_progressiveDecoder = nil;
_progressiveIgnored = YES;
return;
}
}
if (_progressiveDecoder.frameCount == 0) return;
if (!progressiveBlur) {
YYImageFrame *frame = [_progressiveDecoder frameAtIndex:0 decodeForDisplay:YES];
if (frame.image) {
[_lock lock];
if (![self isCancelled]) {
_completion(frame.image, _request.URL, YYWebImageFromRemote, YYWebImageStageProgress, nil);
_lastProgressiveDecodeTimestamp = now;
}
[_lock unlock];
}
return;
} else {
if (_progressiveDecoder.type == YYImageTypeJPEG) {
if (!_progressiveDetected) {
NSDictionary *dic = [_progressiveDecoder framePropertiesAtIndex:0];
NSDictionary *jpeg = dic[(id)kCGImagePropertyJFIFDictionary];
NSNumber *isProg = jpeg[(id)kCGImagePropertyJFIFIsProgressive];
if (!isProg.boolValue) {
_progressiveIgnored = YES;
_progressiveDecoder = nil;
return;
}
_progressiveDetected = YES;
}
NSInteger scanLength = (NSInteger)_data.length - (NSInteger)_progressiveScanedLength - 4;
if (scanLength <= 2) return;
NSRange scanRange = NSMakeRange(_progressiveScanedLength, scanLength);
NSRange markerRange = [_data rangeOfData:JPEGSOSMarker() options:kNilOptions range:scanRange];
_progressiveScanedLength = _data.length;
if (markerRange.location == NSNotFound) return;
if ([self isCancelled]) return;
} else if (_progressiveDecoder.type == YYImageTypePNG) {
if (!_progressiveDetected) {
NSDictionary *dic = [_progressiveDecoder framePropertiesAtIndex:0];
NSDictionary *png = dic[(id)kCGImagePropertyPNGDictionary];
NSNumber *isProg = png[(id)kCGImagePropertyPNGInterlaceType];
if (!isProg.boolValue) {
_progressiveIgnored = YES;
_progressiveDecoder = nil;
return;
}
_progressiveDetected = YES;
}
}
YYImageFrame *frame = [_progressiveDecoder frameAtIndex:0 decodeForDisplay:YES];
UIImage *image = frame.image;
if (!image) return;
if ([self isCancelled]) return;
if (!YYCGImageLastPixelFilled(image.CGImage)) return;
_progressiveDisplayCount++;
CGFloat radius = 32;
if (_expectedSize > 0) {
radius *= 1.0 / (3 * _data.length / (CGFloat)_expectedSize + 0.6) - 0.25;
} else {
radius /= (_progressiveDisplayCount);
}
image = [image imageByBlurRadius:radius tintColor:nil tintMode:0 saturation:1 maskImage:nil];
if (image) {
[_lock lock];
if (![self isCancelled]) {
_completion(image, _request.URL, YYWebImageFromRemote, YYWebImageStageProgress, nil);
_lastProgressiveDecodeTimestamp = now;
}
[_lock unlock];
}
}
}
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
@autoreleasepool {
[_lock lock];
_connection = nil;
if (![self isCancelled]) {
__weak typeof(self) _self = self;
dispatch_async([self.class _imageQueue], ^{
__strong typeof(_self) self = _self;
if (!self) return;
BOOL shouldDecode = (self.options & YYWebImageOptionIgnoreImageDecoding) == 0;
BOOL allowAnimation = (self.options & YYWebImageOptionIgnoreAnimatedImage) == 0;
UIImage *image;
BOOL hasAnimation = NO;
if (allowAnimation) {
image = [[YYImage alloc] initWithData:self.data scale:[UIScreen mainScreen].scale];
if (shouldDecode) image = [image imageByDecoded];
if ([((YYImage *)image) animatedImageFrameCount] > 1) {
hasAnimation = YES;
}
} else {
YYImageDecoder *decoder = [YYImageDecoder decoderWithData:self.data scale:[UIScreen mainScreen].scale];
image = [decoder frameAtIndex:0 decodeForDisplay:shouldDecode].image;
}
/*
If the image has animation, save the original image data to disk cache.
If the image is not PNG or JPEG, re-encode the image to PNG or JPEG for
better decoding performance.
*/
YYImageType imageType = YYImageDetectType((__bridge CFDataRef)self.data);
switch (imageType) {
case YYImageTypeJPEG:
case YYImageTypeGIF:
case YYImageTypePNG:
case YYImageTypeWebP: { // save to disk cache
if (!hasAnimation) {
if (imageType == YYImageTypeGIF ||
imageType == YYImageTypeWebP) {
self.data = nil; // clear the data, re-encode for disk cache
}
}
} break;
default: {
self.data = nil; // clear the data, re-encode for disk cache
} break;
}
if ([self isCancelled]) return;
if (self.transform && image) {
UIImage *newImage = self.transform(image, self.request.URL);
if (newImage != image) {
self.data = nil;
}
image = newImage;
if ([self isCancelled]) return;
}
[self performSelector:@selector(_didReceiveImageFromWeb:) onThread:[self.class _networkThread] withObject:image waitUntilDone:NO];
});
if (![self.request.URL isFileURL] && (self.options & YYWebImageOptionShowNetworkActivity)) {
[[UIApplication sharedExtensionApplication] decrementNetworkActivityCount];
}
}
[_lock unlock];
}
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
@autoreleasepool {
[_lock lock];
if (![self isCancelled]) {
if (_completion) {
_completion(nil, _request.URL, YYWebImageFromNone, YYWebImageStageFinished, error);
}
_connection = nil;
_data = nil;
if (![_request.URL isFileURL] && (_options & YYWebImageOptionShowNetworkActivity)) {
[[UIApplication sharedExtensionApplication] decrementNetworkActivityCount];
}
[self _finish];
if (_options & YYWebImageOptionIgnoreFailedURL) {
if (error.code != NSURLErrorNotConnectedToInternet &&
error.code != NSURLErrorCancelled &&
error.code != NSURLErrorTimedOut &&
error.code != NSURLErrorUserCancelledAuthentication &&
error.code != NSURLErrorNetworkConnectionLost) {
URLInBlackListAdd(_request.URL);
}
}
}
[_lock unlock];
}
}
#pragma mark - Override NSOperation
- (void)start {
@autoreleasepool {
[_lock lock];
self.started = YES;
if ([self isCancelled]) {
[self performSelector:@selector(_cancelOperation) onThread:[[self class] _networkThread] withObject:nil waitUntilDone:NO modes:@[NSDefaultRunLoopMode]];
self.finished = YES;
} else if ([self isReady] && ![self isFinished] && ![self isExecuting]) {
if (!_request) {
self.finished = YES;
if (_completion) {
NSError *error = [NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorFileDoesNotExist userInfo:@{NSLocalizedDescriptionKey:@"request in nil"}];
_completion(nil, _request.URL, YYWebImageFromNone, YYWebImageStageFinished, error);
}
} else {
self.executing = YES;
[self performSelector:@selector(_startOperation) onThread:[[self class] _networkThread] withObject:nil waitUntilDone:NO modes:@[NSDefaultRunLoopMode]];
if ((_options & YYWebImageOptionAllowBackgroundTask) && ![UIApplication isAppExtension]) {
__weak __typeof__ (self) _self = self;
if (_taskID == UIBackgroundTaskInvalid) {
_taskID = [[UIApplication sharedExtensionApplication] beginBackgroundTaskWithExpirationHandler:^{
__strong __typeof (_self) self = _self;
if (self) {
[self cancel];
self.finished = YES;
}
}];
}
}
}
}
[_lock unlock];
}
}
- (void)cancel {
[_lock lock];
if (![self isCancelled]) {
[super cancel];
self.cancelled = YES;
if ([self isExecuting]) {
self.executing = NO;
[self performSelector:@selector(_cancelOperation) onThread:[[self class] _networkThread] withObject:nil waitUntilDone:NO modes:@[NSDefaultRunLoopMode]];
}
if (self.started) {
self.finished = YES;
}
}
[_lock unlock];
}
- (void)setExecuting:(BOOL)executing {
[_lock lock];
if (_executing != executing) {
[self willChangeValueForKey:@"isExecuting"];
_executing = executing;
[self didChangeValueForKey:@"isExecuting"];
}
[_lock unlock];
}
- (BOOL)isExecuting {
[_lock lock];
BOOL executing = _executing;
[_lock unlock];
return executing;
}
- (void)setFinished:(BOOL)finished {
[_lock lock];
if (_finished != finished) {
[self willChangeValueForKey:@"isFinished"];
_finished = finished;
[self didChangeValueForKey:@"isFinished"];
}
[_lock unlock];
}
- (BOOL)isFinished {
[_lock lock];
BOOL finished = _finished;
[_lock unlock];
return finished;
}
- (void)setCancelled:(BOOL)cancelled {
[_lock lock];
if (_cancelled != cancelled) {
[self willChangeValueForKey:@"isCancelled"];
_cancelled = cancelled;
[self didChangeValueForKey:@"isCancelled"];
}
[_lock unlock];
}
- (BOOL)isCancelled {
[_lock lock];
BOOL cancelled = _cancelled;
[_lock unlock];
return cancelled;
}
- (BOOL)isConcurrent {
return YES;
}
- (BOOL)isAsynchronous {
return YES;
}
+ (BOOL)automaticallyNotifiesObserversForKey:(NSString *)key {
if ([key isEqualToString:@"isExecuting"] ||
[key isEqualToString:@"isFinished"] ||
[key isEqualToString:@"isCancelled"]) {
return NO;
}
return [super automaticallyNotifiesObserversForKey:key];
}
- (NSString *)description {
NSMutableString *string = [NSMutableString stringWithFormat:@"<%@: %p ",self.class, self];
[string appendFormat:@" executing:%@", [self isExecuting] ? @"YES" : @"NO"];
[string appendFormat:@" finished:%@", [self isFinished] ? @"YES" : @"NO"];
[string appendFormat:@" cancelled:%@", [self isCancelled] ? @"YES" : @"NO"];
[string appendString:@">"];
return string;
}
@end