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Improvement download operation for priority and some protect (#2208) 

* Add a cache check for 304 response when using NSURLCache

* Remove the extra cost to nil the imageData because at this time operation is already been cancelled or done

* Fix download operation may not marked as finished when data task create failed

* A little code reorder

* Adopt the priority options to change URLSessionTask's priority
This commit is contained in:
DreamPiggy 2018-02-08 11:22:26 +08:00 committed by GitHub
parent bd22ad8725
commit 2646b3a1f2
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 27 additions and 23 deletions
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50
SDWebImage/SDWebImageDownloaderOperation.m
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@ -136,7 +136,7 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
}
#endif
NSURLSession *session = self.unownedSession;
if (!self.unownedSession) {
if (!session) {
NSURLSessionConfiguration *sessionConfig = [NSURLSessionConfiguration defaultSessionConfiguration];
sessionConfig.timeoutIntervalForRequest = 15;
@ -145,10 +145,10 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
* We send nil as delegate queue so that the session creates a serial operation queue for performing all delegate
* method calls and completion handler calls.
*/
self.ownedSession = [NSURLSession sessionWithConfiguration:sessionConfig
delegate:self
delegateQueue:nil];
session = self.ownedSession;
session = [NSURLSession sessionWithConfiguration:sessionConfig
delegate:self
delegateQueue:nil];
self.ownedSession = session;
}
if (self.options & SDWebImageDownloaderIgnoreCachedResponse) {
@ -170,10 +170,19 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
self.dataTask = [session dataTaskWithRequest:self.request];
self.executing = YES;
}
[self.dataTask resume];
if (self.dataTask) {
[self.dataTask resume];
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunguarded-availability"
if ([self.dataTask respondsToSelector:@selector(setPriority:)]) {
if (self.options & SDWebImageDownloaderHighPriority) {
self.dataTask.priority = NSURLSessionTaskPriorityHigh;
} else if (self.options & SDWebImageDownloaderLowPriority) {
self.dataTask.priority = NSURLSessionTaskPriorityLow;
}
}
#pragma clang diagnostic pop
for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
progressBlock(0, NSURLResponseUnknownLength, self.request.URL);
}
@ -182,7 +191,9 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
[[NSNotificationCenter defaultCenter] postNotificationName:SDWebImageDownloadStartNotification object:weakSelf];
});
} else {
[self callCompletionBlocksWithError:[NSError errorWithDomain:NSURLErrorDomain code:0 userInfo:@{NSLocalizedDescriptionKey : @"Task can't be initialized"}]];
[self callCompletionBlocksWithError:[NSError errorWithDomain:NSURLErrorDomain code:NSURLErrorUnknown userInfo:@{NSLocalizedDescriptionKey : @"Task can't be initialized"}]];
[self done];
return;
}
#if SD_UIKIT
@ -237,19 +248,6 @@ typedef NSMutableDictionary<NSString *, id> SDCallbacksDictionary;
});
self.dataTask = nil;
NSOperationQueue *delegateQueue;
if (self.unownedSession) {
delegateQueue = self.unownedSession.delegateQueue;
} else {
delegateQueue = self.ownedSession.delegateQueue;
}
if (delegateQueue) {
NSAssert(delegateQueue.maxConcurrentOperationCount == 1, @"NSURLSession delegate queue should be a serial queue");
[delegateQueue addOperationWithBlock:^{
weakSelf.imageData = nil;
}];
}
if (self.ownedSession) {
[self.ownedSession invalidateAndCancel];
self.ownedSession = nil;
@ -283,9 +281,15 @@ didReceiveResponse:(NSURLResponse *)response
expected = expected > 0 ? expected : 0;
self.expectedSize = expected;
self.response = response;
NSInteger statusCode = [response respondsToSelector:@selector(statusCode)] ? ((NSHTTPURLResponse *)response).statusCode : 200;
BOOL valid = statusCode < 400;
//'304 Not Modified' is an exceptional one. It should be treated as cancelled if no cache data
//URLSession current behavior will return 200 status code when the server respond 304 and URLCache hit. But this is not a standard behavior and we just add a check
if (statusCode == 304 && !self.cachedData) {
valid = NO;
}
//'304 Not Modified' is an exceptional one. It should be treated as cancelled.
if (![response respondsToSelector:@selector(statusCode)] || (((NSHTTPURLResponse *)response).statusCode < 400 && ((NSHTTPURLResponse *)response).statusCode != 304)) {
if (valid) {
for (SDWebImageDownloaderProgressBlock progressBlock in [self callbacksForKey:kProgressCallbackKey]) {
progressBlock(0, expected, self.request.URL);
}