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https://github.com/status-im/react-native.git
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235749ba19
Summary: Under rare and as-yet-to-be determined circumstances, images can sometimes fail to load/download and get "stuck", without producing an error. Because the `RCTNetworkTask` for these images is stuck in the "in progress" state, they clog up the RCTImageLoader task queue, which has a limit of 4 concurrent in-progress tasks. This was previously masked by the fact that we automatically cancelled image requests when the RCTImageView moved offscreen, but we no longer do that. This diff adds logic to detect some types of stuck task and remove them, thereby unblocking the queue. I've also restored the functionality of cancelling downloads for offscreen images (but not unloading the image itself) so that stuck images will be cancelled when you move to another screen, instead of using up space in the queue forever. Reviewed By: fkgozali Differential Revision: D3398105 fbshipit-source-id: 75ee40d06a872ae8e1cb57f02f9cad57c459143c
93 lines
2.7 KiB
Objective-C
93 lines
2.7 KiB
Objective-C
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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#import "RCTFileRequestHandler.h"
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#import <MobileCoreServices/MobileCoreServices.h>
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#import "RCTUtils.h"
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@implementation RCTFileRequestHandler
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{
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NSOperationQueue *_fileQueue;
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}
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RCT_EXPORT_MODULE()
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- (void)invalidate
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{
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[_fileQueue cancelAllOperations];
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_fileQueue = nil;
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}
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- (BOOL)canHandleRequest:(NSURLRequest *)request
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{
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return
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[request.URL.scheme caseInsensitiveCompare:@"file"] == NSOrderedSame
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&& !RCTIsXCAssetURL(request.URL);
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}
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- (NSOperation *)sendRequest:(NSURLRequest *)request
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withDelegate:(id<RCTURLRequestDelegate>)delegate
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{
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// Lazy setup
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if (!_fileQueue) {
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_fileQueue = [NSOperationQueue new];
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_fileQueue.maxConcurrentOperationCount = 4;
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}
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__weak __block NSBlockOperation *weakOp;
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__block NSBlockOperation *op = [NSBlockOperation blockOperationWithBlock:^{
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// Get content length
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NSError *error = nil;
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NSFileManager *fileManager = [NSFileManager new];
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NSDictionary<NSString *, id> *fileAttributes = [fileManager attributesOfItemAtPath:request.URL.path error:&error];
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if (!fileAttributes) {
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[delegate URLRequest:weakOp didCompleteWithError:error];
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return;
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}
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// Get mime type
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NSString *fileExtension = [request.URL pathExtension];
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NSString *UTI = (__bridge_transfer NSString *)UTTypeCreatePreferredIdentifierForTag(
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kUTTagClassFilenameExtension, (__bridge CFStringRef)fileExtension, NULL);
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NSString *contentType = (__bridge_transfer NSString *)UTTypeCopyPreferredTagWithClass(
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(__bridge CFStringRef)UTI, kUTTagClassMIMEType);
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// Send response
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NSURLResponse *response = [[NSURLResponse alloc] initWithURL:request.URL
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MIMEType:contentType
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expectedContentLength:[fileAttributes[NSFileSize] ?: @-1 integerValue]
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textEncodingName:nil];
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[delegate URLRequest:weakOp didReceiveResponse:response];
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// Load data
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NSData *data = [NSData dataWithContentsOfURL:request.URL
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options:NSDataReadingMappedIfSafe
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error:&error];
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if (data) {
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[delegate URLRequest:weakOp didReceiveData:data];
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}
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[delegate URLRequest:weakOp didCompleteWithError:error];
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}];
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weakOp = op;
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[_fileQueue addOperation:op];
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return op;
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}
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- (void)cancelRequest:(NSOperation *)op
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{
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[op cancel];
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}
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@end
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