信号量等待导致 AFNetworking 阻塞?
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【中文标题】信号量等待导致 AFNetworking 阻塞?【英文标题】:Semaphore wait causing a block of AFNetworking? 【发布时间】:2014-05-09 14:47:10 【问题描述】:我正在尝试使用单元测试来测试网络。在我的测试之外调用时, loginWithUserName:password: 方法正确失败并调用外部失败块。从我的测试方法中调用时,永远不会调用失败块(成功块也不会)。
我认为也许我的信号量等待导致网络也等待,但我不这么认为,因为它位于不同的线程上。我希望它在不同的线程上,所以我可以进行异步调用。我可以修复它以使其正常工作吗?我应该使用不同的技术吗?
我的测试方法设置如下:
typedef void (^CompleteBlock)();
- (void)testLogin
dispatch_semaphore_t sema = dispatch_semaphore_create(0);
[self callLoginWithCompletion:^
XCTAssertTrue(true, @"login Complete"); // expand on this when I get basic premise working
NSLog(@"asserted true");
dispatch_semaphore_signal(sema);
];
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
- (void)callLoginWithCompletion:(CompleteBlock)completeBlock
NSLog(@"login method called");
[[NSNotificationCenter defaultCenter] addObserverForName:kLoginComplete
object:nil
queue:[NSOperationQueue mainQueue]
usingBlock:^(NSNotification *note)
completeBlock();
];
[Network loginWithUserName:@"dummyUser" password:@"dummyPassword"];
我的登录方法如下所示: 静态 AFNetworkReachabilityManager *_reachabilityManager;
+ (AFHTTPRequestOperationManager *)gatewayClient
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^
_gatewayClient = [[AFHTTPRequestOperationManager alloc] initWithBaseURL:[NSURL URLWithString:kGatewayBaseURL]];
_gatewayClient.responseSerializer.acceptableContentTypes = [NSSet setWithObject:@"text/plain"];
);
AFSecurityPolicy *securityPolicy = [AFSecurityPolicy policyWithPinningMode:AFSSLPinningModeNone];
securityPolicy.allowInvalidCertificates = YES;
[AFHTTPRequestOperationManager manager].securityPolicy = securityPolicy;
return _gatewayClient;
+ (NSString *)baseURLForType:(NSString *)type method:(NSString *)method
return [NSString stringWithFormat:@"api/%@/%@", type, method];
+ (void)loginWithUserName:(NSString *)userName password:(NSString *)password
[Network.gatewayClient
GET:[self baseURLForType:@"auth"
method:@"getpubtoken"]
parameters:nil
success:^(AFHTTPRequestOperation *operation, id responseObject)
_authToken = responseObject;
NSDictionary *parameters = @
@"UserId": userName
, @"Password": password
, kApiVersion: kApiVersion
, kApiKey: kApiKeyValue
, kAuthToken: _authToken
, kFundraisingPlatform: @(Blackbaud)
;
[Network.gatewayClient
POST:[self baseURLForType:@"auth"
method:@"loginfundraiser"]
parameters:parameters
success:^(AFHTTPRequestOperation *operation, id responseObject)
NSDictionary *responseDict = (NSDictionary *)responseObject;
NSDictionary *userInfo = nil;
_authToken = responseDict[kAuthToken];
if ([responseDict[@"Successful"] boolValue])
userInfo = @ kAuthToken: responseObject[kAuthToken] ;
else
userInfo = @ @"error": [[NSError alloc] initWithDomain:@"Authorization"
code:-1000
userInfo:@ @"message": responseDict[@"ExtendedMessages"] ] ;
[[NSNotificationCenter defaultCenter] postNotificationName:kLoginComplete
object:nil
userInfo:userInfo];
failure:^(AFHTTPRequestOperation *operation, NSError *error)
NSDictionary *userInfo = @ @"error": error ;
[[NSNotificationCenter defaultCenter] postNotificationName:kLoginComplete
object:nil
userInfo:userInfo];
];
failure:^(AFHTTPRequestOperation *operation, NSError *error)
NSDictionary *userInfo = @ @"error": error ;
[[NSNotificationCenter defaultCenter] postNotificationName:kLoginComplete
object:nil
userInfo:userInfo];
];
【问题讨论】:
AFNetworking 将其完成块调度到主队列,所以如果你用信号量阻塞主线程,完成块将死锁。 在这种情况下,在登录完成后发布通知会是一种更好的模式,并且所有需要执行进一步程序的类都订阅以接收该通知,您可以继续无需使用信号量。 在网络登录方法的成功/失败块中,我发送通知。问题是测试,在收到网络通知之前如何暂停测试?我可以告诉 AFNetworking 使用不同的队列来阻止呼叫吗? 【参考方案1】:好的...主要问题是 AFNetworking 的队列并且通知在主线程上。信号量阻塞了主线程,所以两个响应都被阻塞了。
为了测试,必须指定一个新的 NSOperationQueue 来代替 mainQueue。 对于网络类,必须指定一个新的完成队列。似乎没有办法在这些方法上设置默认的完成队列。已就此提出问题。
新的测试代码和网络子集如下所示。
@implementation NetworkTests
NSOperationQueue * testOperationQueue;
- (void)setUp
[super setUp];
testOperationQueue = [[NSOperationQueue alloc] init];
- (void)testLogin
dispatch_semaphore_t sema = dispatch_semaphore_create(0);
[[NSNotificationCenter defaultCenter] addObserverForName:kLoginComplete
object:nil
queue:testOperationQueue
usingBlock:^(NSNotification *note)
XCTAssertTrue(true, @"login Complete"); // expand on this when I get basic premise working
NSLog(@"asserted true");
dispatch_semaphore_signal(sema);
];
[Network loginWithUserName:@"testname" password:@"password"];
dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
@end
对于网络,它有这个:
static dispatch_queue_t completionQueue; // initialized when the _gatewayClient object is created
+ (void)loginWithUserName:(NSString *)userName password:(NSString *)password
AFHTTPRequestOperation *outerOperation =
[Network.gatewayClient
GET:[self baseURLForType:@"auth"
method:@"getpubtoken"]
parameters:nil
success:^(AFHTTPRequestOperation *operation, id responseObject)
// do stuff here
failure:^(AFHTTPRequestOperation *operation, NSError *error)
NSDictionary *userInfo = @ @"error": error ;
[[NSNotificationCenter defaultCenter] postNotificationName:kLoginComplete
object:nil
userInfo:userInfo];
];
outerOperation.completionQueue = completionQueue;
【讨论】:
【参考方案2】:我知道现在回答为时已晚。对于那些来到这个帖子的人来说
afnetwork manager 有一个完成队列,它的默认值是 main queue 。
您可以将其更改为另一个队列,如后台队列以避免锁定
[AFHTTPSessionManager manager].completionQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0);
【讨论】:
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