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// Copyright 2017 Google
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#import "FIRStorageDownloadTask.h"
#import "FIRStorageConstants_Private.h"
#import "FIRStorageDownloadTask_Private.h"
#import "FIRStorageObservableTask_Private.h"
#import "FIRStorageTask_Private.h"
@implementation FIRStorageDownloadTask
@synthesize progress = _progress;
@synthesize fetcher = _fetcher;
- (instancetype)initWithReference:(FIRStorageReference *)reference
fetcherService:(GTMSessionFetcherService *)service
file:(nullable NSURL *)fileURL {
self = [super initWithReference:reference fetcherService:service];
if (self) {
_fileURL = [fileURL copy];
_progress = [NSProgress progressWithTotalUnitCount:0];
}
return self;
}
- (void)enqueue {
[self enqueueWithData:nil];
}
- (void)enqueueWithData:(nullable NSData *)resumeData {
NSAssert([NSThread isMainThread], @"Download attempting to execute on non main queue! Please "
@"only execute this method on the main queue.");
self.state = FIRStorageTaskStateQueueing;
NSMutableURLRequest *request = [self.baseRequest mutableCopy];
request.HTTPMethod = @"GET";
request.timeoutInterval = self.reference.storage.maxDownloadRetryTime;
NSURLComponents *components =
[NSURLComponents componentsWithURL:request.URL resolvingAgainstBaseURL:NO];
[components setQuery:@"alt=media"];
request.URL = components.URL;
GTMSessionFetcher *fetcher;
if (resumeData) {
fetcher = [GTMSessionFetcher fetcherWithDownloadResumeData:resumeData];
fetcher.comment = @"Resuming DownloadTask";
} else {
fetcher = [self.fetcherService fetcherWithRequest:request];
fetcher.comment = @"Starting DownloadTask";
}
[fetcher setResumeDataBlock:^(NSData *data) {
if (data) {
_downloadData = data;
}
}];
fetcher.maxRetryInterval = self.reference.storage.maxDownloadRetryTime;
if (_fileURL) {
// Handle file downloads
[fetcher setDestinationFileURL:_fileURL];
[fetcher setDownloadProgressBlock:^(int64_t bytesWritten, int64_t totalBytesWritten,
int64_t totalBytesExpectedToWrite) {
self.state = FIRStorageTaskStateProgress;
self.progress.completedUnitCount = totalBytesWritten;
self.progress.totalUnitCount = totalBytesExpectedToWrite;
FIRStorageTaskSnapshot *snapshot = self.snapshot;
[self fireHandlersForStatus:FIRStorageTaskStatusProgress snapshot:snapshot];
self.state = FIRStorageTaskStateRunning;
}];
} else {
// Handle data downloads
[fetcher setReceivedProgressBlock:^(int64_t bytesWritten, int64_t totalBytesWritten) {
self.state = FIRStorageTaskStateProgress;
self.progress.completedUnitCount = totalBytesWritten;
int64_t totalLength = [[self.fetcher response] expectedContentLength];
self.progress.totalUnitCount = totalLength;
FIRStorageTaskSnapshot *snapshot = self.snapshot;
[self fireHandlersForStatus:FIRStorageTaskStatusProgress snapshot:snapshot];
self.state = FIRStorageTaskStateRunning;
}];
}
_fetcher = fetcher;
self.state = FIRStorageTaskStateRunning;
[self.fetcher beginFetchWithCompletionHandler:^(NSData *data, NSError *error) {
// Fire last progress updates
[self fireHandlersForStatus:FIRStorageTaskStatusProgress snapshot:self.snapshot];
// Handle potential issues with download
if (error) {
self.state = FIRStorageTaskStateFailed;
self.error = [FIRStorageErrors errorWithServerError:error reference:self.reference];
[self fireHandlersForStatus:FIRStorageTaskStatusFailure snapshot:self.snapshot];
[self removeAllObservers];
return;
}
// Download completed successfully, fire completion callbacks
self.state = FIRStorageTaskStateSuccess;
if (data) {
_downloadData = data;
}
[self fireHandlersForStatus:FIRStorageTaskStatusSuccess snapshot:self.snapshot];
[self removeAllObservers];
}];
}
#pragma mark - Download Management
- (void)cancel {
NSError *error = [FIRStorageErrors errorWithCode:FIRStorageErrorCodeCancelled];
[self cancelWithError:error];
}
- (void)cancelWithError:(NSError *)error {
NSAssert([NSThread isMainThread], @"Cancel attempting to execute on non main queue! Please only "
@"execute this method on the main queue.");
self.state = FIRStorageTaskStateCancelled;
[self.fetcher stopFetching];
self.error = error;
[self fireHandlersForStatus:FIRStorageTaskStatusFailure snapshot:self.snapshot];
}
- (void)pause {
NSAssert([NSThread isMainThread], @"Pause attempting to execute on non main queue! Please only "
@"execute this method on the main queue.");
self.state = FIRStorageTaskStatePausing;
[self.fetcher stopFetching];
// Give the resume callback a chance to run (if scheduled)
[self.fetcher waitForCompletionWithTimeout:0.001];
self.state = FIRStorageTaskStatePaused;
FIRStorageTaskSnapshot *snapshot = self.snapshot;
[self fireHandlersForStatus:FIRStorageTaskStatusPause snapshot:snapshot];
}
- (void)resume {
NSAssert([NSThread isMainThread], @"Resume attempting to execute on non main queue! Please only "
@"execute this method on the main queue.");
self.state = FIRStorageTaskStateResuming;
FIRStorageTaskSnapshot *snapshot = self.snapshot;
[self fireHandlersForStatus:FIRStorageTaskStatusResume snapshot:snapshot];
self.state = FIRStorageTaskStateRunning;
[self enqueueWithData:_downloadData];
}
@end
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