I'm in the process of creating an upload/download media feature for my app. I had the queue working fine for uploads but when I added downloads and the requisite download delegates the upload delegate was called event though the task was to download. My initial class structure was a singleton QueueController that had the NSURLSession and delegates (but not download) along with a TransferModel that could hold either the upload or download. When I tried to add downloads the callbacks were not working right so I moved to put the transfer related delegates in two sub classes TransferUploadModel and TransferDownloadModel but now my delegates are not firing.
Here is what my method signatures look like: QueueController:
@interface QueueController : NSObject<NSURLSessionDelegate>
@property(nonatomic, weak) NSObject<QueueControllerDelegate>* delegate;
@property(atomic, strong) NSURLSession* session;
@property(nonatomic) NSURLSessionConfiguration* configuration;
+ (QueueController*)sharedInstance;
@end
@implementation QueueController {
- (void)application:(UIApplication *)application
handleEventsForBackgroundURLSession:(NSString *)identifier
completionHandler:(void (^)(void))completionHandler {
//...
}
TransferUploadModel:
@interface TransferUploadModel : TransferModel <NSURLSessionTaskDelegate,
NSURLSessionDataDelegate>
//...
@end
//Note TransferModel is a subclass of NSOperation
@implementation TransferUploadModel
- (id)initWithMedia:(MediaItem*)mediaItem_
withTransferType:(TransferType)transferType_
andWiths3Path:s3Path_
andWiths3file_name:s3file_name_
andWithNSURLSession:session {
}
- (void)main {
//NSOperation override
}
//
// Transfer upload started
//
- (void)uploadMedia {
/*
* Fetch signed URL
*/
AWSS3GetPreSignedURLRequest *getPreSignedURLRequest = [AWSS3GetPreSignedURLRequest new];
getPreSignedURLRequest.bucket = BUCKET_NAME;
getPreSignedURLRequest.key = @"mypic.jpeg";
getPreSignedURLRequest.HTTPMethod = AWSHTTPMethodPUT;
getPreSignedURLRequest.expires = [NSDate dateWithTimeIntervalSinceNow:3600];
// Important: must set contentType for PUT request
getPreSignedURLRequest.contentType = self.content_type;
NSLog(@"headers: %@", getPreSignedURLRequest);
/*
* Upload the file
*/
[[[AWSS3PreSignedURLBuilder defaultS3PreSignedURLBuilder] getPreSignedURL:getPreSignedURLRequest] continueWithBlock:^id(AWSTask *task) {
if (task.error) {
NSLog(@"Error: %@", task.error);
} else {
NSURL* presignedURL = task.result;
NSLog(@"upload presignedURL is: \n%@", presignedURL);
NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:presignedURL];
request.cachePolicy = NSURLRequestReloadIgnoringLocalCacheData;
[request setHTTPMethod:@"PUT"];
[request setValue:self.content_type forHTTPHeaderField:@"Content-Type"];
@try {
self.nsurlSessionUploadTask = [self.nsurlSession uploadTaskWithRequest:request
fromFile:self.mediaCopyURL];
[self.nsurlSessionUploadTask resume];
//
// Delegates don't fire after this...
//
} @catch (NSException* exception) {
NSLog(@"exception creating upload task: %@", exception);
}
}
return nil;
}];
}
//
// NSURLSessionDataDelegate : didReceiveData
//
- (void)URLSession:(NSURLSession *)session
dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data {
NSLog(@"...");
}
//
// Initial response from server with headers
//
- (void)URLSession:(NSURLSession *)session
dataTask:(NSURLSessionDataTask *)dataTask
didReceiveResponse:(NSURLResponse *)response
completionHandler:
(void (^)(NSURLSessionResponseDisposition disposition))completionHandler {
NSLog(@"response.description:%@", response.description);
completionHandler(NSURLSessionResponseAllow);
}
//
// Upload transfer in progress
//
- (void)URLSession:(NSURLSession *)session
task:(NSURLSessionUploadTask *)task
didSendBodyData:(int64_t)bytesSent
totalBytesSent:(int64_t)totalBytesSent
totalBytesExpectedToSend:(int64_t)totalBytesExpectedToSend {
@try {
NSLog(@"...");
} @catch (NSException *exception) {
NSLog(@"%s exception: %@", __PRETTY_FUNCTION__, exception);
}
}
//
// Upload transfer completed
//
- (void)URLSession:(NSURLSession *)session
task:(NSURLSessionTask *)task
didCompleteWithError:(NSError *)error {
NSLog(@"...");
} // end URLSession:session:task:error
@end
Any help is much appreciated.
Thanks,
J