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// Copyright 2019 Google
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#import "Crashlytics/Shared/FIRCLSNetworking/FIRCLSFABNetworkClient.h"
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#import "Crashlytics/Shared/FIRCLSNetworking/FIRCLSNetworkResponseHandler.h"
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static const float FIRCLSNetworkMinimumRetryJitter = 0.90f;
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static const float FIRCLSNetworkMaximumRetryJitter = 1.10f;
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const NSUInteger FIRCLSNetworkMaximumRetryCount = 10;
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@interface FIRCLSFABNetworkClient () <NSURLSessionDelegate, NSURLSessionTaskDelegate>
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@property(nonatomic, strong, readonly) NSURLSession *session;
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@end
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@implementation FIRCLSFABNetworkClient
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- (instancetype)init {
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return [self initWithQueue:nil];
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}
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- (instancetype)initWithQueue:(nullable NSOperationQueue *)operationQueue {
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NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
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return [self initWithSessionConfiguration:config queue:operationQueue];
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}
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- (instancetype)initWithSessionConfiguration:(NSURLSessionConfiguration *)config
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queue:(nullable NSOperationQueue *)operationQueue {
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self = [super init];
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if (!self) {
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return nil;
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}
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_session = [NSURLSession sessionWithConfiguration:config
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delegate:self
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delegateQueue:operationQueue];
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if (!_session) {
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return nil;
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}
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return self;
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}
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- (void)dealloc {
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[_session finishTasksAndInvalidate];
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}
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#pragma mark - Delay Handling
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- (double)randomDoubleWithMin:(double)min max:(double)max {
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return min + ((max - min) * drand48());
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}
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- (double)generateRandomJitter {
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return [self randomDoubleWithMin:FIRCLSNetworkMinimumRetryJitter
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max:FIRCLSNetworkMaximumRetryJitter];
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}
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- (NSTimeInterval)computeDelayForResponse:(NSURLResponse *)response
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withRetryCount:(NSUInteger)count {
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NSTimeInterval initialValue = [FIRCLSNetworkResponseHandler retryValueForResponse:response];
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// make sure count is > 0
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count = MAX(count, 1);
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// make sure initialValue is >2 for exponential backoff to work reasonably with low count numbers
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initialValue = MAX(initialValue, 2.0);
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const double jitter = [self generateRandomJitter];
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return pow(initialValue, count) * jitter; // exponential backoff
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}
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- (void)runAfterRetryValueFromResponse:(NSURLResponse *)response
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attempts:(NSUInteger)count
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onQueue:(dispatch_queue_t)queue
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block:(void (^)(void))block {
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const NSTimeInterval delay = [self computeDelayForResponse:response withRetryCount:count];
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dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (uint64_t)(delay * NSEC_PER_SEC)), queue, block);
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}
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- (void)runAfterRetryValueFromResponse:(NSURLResponse *)response
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attempts:(NSUInteger)count
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block:(void (^)(void))block {
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dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
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[self runAfterRetryValueFromResponse:response attempts:count onQueue:queue block:block];
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}
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#pragma mark - Tasks
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- (void)startDataTaskWithRequest:(NSURLRequest *)request
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retryLimit:(NSUInteger)retryLimit
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tries:(NSUInteger)tries
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completionHandler:(FIRCLSNetworkDataTaskCompletionHandlerBlock)completionHandler {
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NSURLSessionTask *task = [self.session
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dataTaskWithRequest:request
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completionHandler:^(NSData *data, NSURLResponse *response, NSError *taskError) {
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[FIRCLSNetworkResponseHandler
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handleCompletedResponse:response
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forOriginalRequest:request
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error:taskError
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block:^(BOOL retry, NSError *error) {
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if (!retry) {
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completionHandler(data, response, error);
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return;
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}
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if (tries >= retryLimit) {
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NSDictionary *userInfo = @{
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@"retryLimit" : @(retryLimit),
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NSURLErrorFailingURLStringErrorKey : request.URL
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};
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completionHandler(
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nil, nil,
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[NSError
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errorWithDomain:FIRCLSNetworkErrorDomain
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code:FIRCLSNetworkErrorMaximumAttemptsReached
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userInfo:userInfo]);
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return;
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}
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[self
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runAfterRetryValueFromResponse:response
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attempts:tries
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block:^{
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[self
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startDataTaskWithRequest:
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request
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retryLimit:
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retryLimit
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tries:
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(tries +
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1)
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completionHandler:
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completionHandler];
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}];
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}];
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}];
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[task resume];
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if (!task) {
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completionHandler(nil, nil,
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[NSError errorWithDomain:FIRCLSNetworkErrorDomain
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code:FIRCLSNetworkErrorFailedToStartOperation
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userInfo:nil]);
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}
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}
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- (void)startDataTaskWithRequest:(NSURLRequest *)request
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retryLimit:(NSUInteger)retryLimit
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completionHandler:(FIRCLSNetworkDataTaskCompletionHandlerBlock)completionHandler {
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[self startDataTaskWithRequest:request
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retryLimit:retryLimit
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tries:0
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completionHandler:completionHandler];
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}
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- (void)startDataTaskWithRequest:(NSURLRequest *)request
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completionHandler:(FIRCLSNetworkDataTaskCompletionHandlerBlock)completionHandler {
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[self startDataTaskWithRequest:request
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retryLimit:FIRCLSNetworkMaximumRetryCount
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completionHandler:completionHandler];
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}
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- (void)startDownloadTaskWithRequest:(NSURLRequest *)request
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retryLimit:(NSUInteger)retryLimit
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tries:(NSUInteger)tries
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completionHandler:
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(FIRCLSNetworkDownloadTaskCompletionHandlerBlock)completionHandler {
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NSURLSessionTask *task = [self.session
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downloadTaskWithRequest:request
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completionHandler:^(NSURL *location, NSURLResponse *response, NSError *taskError) {
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[FIRCLSNetworkResponseHandler
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handleCompletedResponse:response
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forOriginalRequest:request
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error:taskError
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block:^(BOOL retry, NSError *error) {
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if (!retry) {
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completionHandler(location, response, error);
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return;
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}
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if (tries >= retryLimit) {
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NSDictionary *userInfo = @{
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@"retryLimit" : @(retryLimit),
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NSURLErrorFailingURLStringErrorKey : request.URL
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};
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completionHandler(
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nil, nil,
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[NSError
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errorWithDomain:FIRCLSNetworkErrorDomain
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code:
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FIRCLSNetworkErrorMaximumAttemptsReached
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userInfo:userInfo]);
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return;
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}
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[self
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runAfterRetryValueFromResponse:response
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attempts:tries
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block:^{
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[self
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startDownloadTaskWithRequest:
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request
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retryLimit:
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retryLimit
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tries:
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(tries +
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1)
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completionHandler:
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completionHandler];
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}];
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}];
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}];
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[task resume];
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if (!task) {
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completionHandler(nil, nil,
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[NSError errorWithDomain:FIRCLSNetworkErrorDomain
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code:FIRCLSNetworkErrorFailedToStartOperation
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userInfo:nil]);
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}
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}
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- (void)startDownloadTaskWithRequest:(NSURLRequest *)request
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retryLimit:(NSUInteger)retryLimit
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completionHandler:
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(FIRCLSNetworkDownloadTaskCompletionHandlerBlock)completionHandler {
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[self startDownloadTaskWithRequest:request
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retryLimit:retryLimit
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tries:0
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completionHandler:completionHandler];
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}
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- (void)startDownloadTaskWithRequest:(NSURLRequest *)request
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completionHandler:
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(FIRCLSNetworkDownloadTaskCompletionHandlerBlock)completionHandler {
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[self startDownloadTaskWithRequest:request
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retryLimit:FIRCLSNetworkMaximumRetryCount
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completionHandler:completionHandler];
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}
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- (void)invalidateAndCancel {
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[self.session invalidateAndCancel];
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}
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#pragma mark - NSURLSession Delegate
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- (void)URLSession:(NSURLSession *)session didBecomeInvalidWithError:(NSError *)error {
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}
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@end
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