mac*_*nra 5 nsurlconnection ios
在我们的iPhone应用程序中,NSURLConnection请求暂时出现了间歇性问题.它似乎发生得更晚了.一旦进入此状态,它就会保持该状态.唯一的决议似乎是杀死应用程序并重新启动它.
观察:
其他杂项:
如下所示,代码在主线程上运行.我假设有一些东西在该线程上阻塞,但是我在暂停应用程序时看到的堆栈跟踪表明主线程没问题.我认为NSURLConnection正在使用自己的线程,必须阻止它.
#define relnil(v) (v = nil)
- (id) initWebRequestController
{
self = [super init];
if (self)
{
//setup a queue to execute all web requests on synchronously
dispatch_queue_t aQueue = dispatch_queue_create("com.myapp.webqueue", NULL);
[self setWebQueue:aQueue];
}
return self;
}
- (void) getStuffFromServer
{
dispatch_queue_t aQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(aQueue, ^{
dispatch_sync([self webQueue], ^{
error_block_t errorBlock = ^(MyAppAPIStatusCode code, NSError * error){
dispatch_async(dispatch_get_main_queue(), ^{
[[self delegate] webRequestController:self didEncounterErrorGettingPointsWithCode:code andOptionalError:error];
});
};
parsing_block_t parsingBlock = ^(CXMLDocument * doc, error_block_t errorHandler){
NSError * error = nil;
CXMLNode * node = [doc nodeForXPath:@"apiResult/data/stuff" error:&error];
if (error || !node) {
errorHandler(MyAppAPIStatusCodeFailedToParse, error);
}
else {
stuffString = [node stringValue];
}
if (stuffString) {
dispatch_async(dispatch_get_main_queue(), ^{
[[self delegate] webRequestController:self didFinishGettingStuff:stuffString];
});
}
else {
errorHandler(MyAppAPIStatusCodeFailedToParse, error);
}
};
NSURL * url = [[NSURL alloc] initWithString:[NSString stringWithFormat:MyAppURLFormat_MyAppAPI, @"stuff/getStuff"]];
NSMutableURLRequest * urlRequest = [[NSMutableURLRequest alloc] initWithURL:url];
NSMutableDictionary * postDictionary = [NSMutableDictionary dictionaryWithObjectsAndKeys:
[[NSUserDefaults standardUserDefaults] objectForKey:MyAppKey_Token], @"token",
origin, @"from",
destination, @"to",
transitTypeString, @"mode",
time, @"time",
nil];
NSString * postString = [WebRequestController httpBodyFromDictionary:postDictionary];
[urlRequest setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
[urlRequest setHTTPMethod:@"POST"];
if (urlRequest)
{
[self performAPIRequest:urlRequest withRequestParameters:postDictionary parsing:parsingBlock errorHandling:errorBlock timeout:kTimeout_Standard];
}
else
{
errorBlock(MyAppAPIStatusCodeInvalidRequest, nil);
}
relnil(url);
relnil(urlRequest);
});
});
}
- (void) performAPIRequest: (NSMutableURLRequest *) request
withRequestParameters: (NSMutableDictionary *) requestParameters
parsing: (parsing_block_t) parsingBlock
errorHandling: (error_block_t) errorBlock
timeout: (NSTimeInterval) timeout
{
NSAssert([self apiConnection] == nil, @"Requesting before previous request has completed");
NSString * postString = [WebRequestController httpBodyFromDictionary:requestParameters];
[request setHTTPBody:[postString dataUsingEncoding:NSUTF8StringEncoding]];
NSString * erVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];
NSString * erBuildVersion = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"];
if ([erBuildVersion isEqualToString:erVersion] || [erBuildVersion isEqualToString:@""]) {
erBuildVersion = @"";
} else {
erBuildVersion = [NSString stringWithFormat:@"(%@)", erBuildVersion];
}
NSString * iosVersion = [[UIDevice currentDevice] systemVersion];
NSString * userAgent = [NSString stringWithFormat:@"MyApp/%@%@ iOS/%@", erVersion, erBuildVersion, iosVersion];
[request setValue:userAgent forHTTPHeaderField:@"User-Agent"];
[request setTimeoutInterval:(timeout-3.0f)];
dispatch_sync(dispatch_get_main_queue(), ^{
NSURLConnection * urlConnection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:NO];
if (urlConnection)
{
[self setApiConnection:urlConnection];
requestParseBlock = [parsingBlock copy];
requestErrorBlock = [errorBlock copy];
NSMutableData * aMutableData = [[NSMutableData alloc] init];
[self setReceivedData:aMutableData];
relnil(aMutableData);
[urlConnection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
[urlConnection start];
relnil(urlConnection);
NSTimer * aTimer = [NSTimer scheduledTimerWithTimeInterval:timeout target:self selector:@selector(timeoutTimerFired:) userInfo:nil repeats:NO];
[self setTimeoutTimer:aTimer];
}
else
{
errorBlock(MyAppAPIStatusCodeInvalidRequest, nil);
}
});
//we want the web requests to appear synchronous from outside of this interface
while ([self apiConnection] != nil)
{
[NSThread sleepForTimeInterval:.25];
}
}
- (void) timeoutTimerFired: (NSTimer *) timer
{
[[self apiConnection] cancel];
relnil(apiConnection);
relnil(receivedData);
[self requestErrorBlock](MyAppAPIStatusCodeTimeout, nil);
requestErrorBlock = nil;
requestParseBlock = nil;
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
[self requestErrorBlock](MyAppAPIStatusCodeFailedToConnect, error);
relnil(apiConnection);
relnil(receivedData);
[[self timeoutTimer] invalidate];
relnil(timeoutTimer);
requestErrorBlock = nil;
requestParseBlock = nil;
}
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
[receivedData setLength:0];
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
[receivedData appendData:data];
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
MyAppAPIStatusCode status = MyAppAPIStatusCodeFailedToParse;
CXMLDocument *doc = [[self receivedData] length] ? [[CXMLDocument alloc] initWithData:[self receivedData] options:0 error:nil] : nil;
DLog(@"response:\n%@", doc);
if (doc)
{
NSError * error = nil;
CXMLNode * node = [doc nodeForXPath:@"apiResult/result" error:&error];
if (!error && node)
{
status = [[node stringValue] intValue];
if (status == MyAppAPIStatusCodeOK)
{
[self requestParseBlock](doc, [self requestErrorBlock]);
}
else if (status == MyAppAPIStatusCodeTokenMissingInvalidOrExpired)
{
[Definitions setToken:nil];
[self requestMyAppTokenIfNotPresent];
[Definitions logout];
dispatch_async(dispatch_get_main_queue(), ^{
[[self delegate] webRequestControllerDidRecivedExpiredTokenError:self];
});
}
else
{
[self requestErrorBlock](status, nil);
}
}
else
{
[self requestErrorBlock](status, nil);
}
}
else
{
status = MyAppAPIStatusCodeUnexpectedResponse;
[self requestErrorBlock](status, nil);
}
relnil(doc);
relnil(apiConnection);
relnil(receivedData);
[[self timeoutTimer] invalidate];
relnil(timeoutTimer);
requestErrorBlock = nil;
requestParseBlock = nil;
}
下面的URL是应用程序处于有问题状态时队列/线程的一些屏幕截图.注意,我认为线程10与先前超时执行的取消有关,尽管互斥锁等待很奇怪.此外,当在其他场合遇到问题时,关于Flurry的线程22中的位不会始终出现.
堆栈跟踪截图:
http://img27.imageshack.us/img27/5614/screenshot20120529at236.png http://img198.imageshack.us/img198/5614/screenshot20120529at236.png
也许我忽视了这些痕迹中明显错误的东西,因为我对iOS/Apple开发相对较新.
如果我有NSURLConnection和相关代码的源代码,所有这些都会更容易解决,但就像它一样,我现在正在黑暗中采取刺.
删除 TestFlight 1.0 SDK 似乎可以解决该问题。TestFlight 还确认他们正在修复问题。鉴于该错误最初被其他人确认已经过去了一个多月，我想知道我们距离修复还有多远。
