ObjFW  Diff

	[sock asyncSendData: context->_queryData
		   receiver: &context->_usedNameServer
		runLoopMode: runLoopMode];
	[sock asyncReceiveIntoBuffer: _buffer
			      length: bufferLength
			 runLoopMode: runLoopMode];
}

- (void)of_cleanUpCache
{
	void *pool = objc_autoreleasePoolPush();
	OFTimeInterval now = [OFDate date].timeIntervalSince1970;
	OFMutableArray *removeList;

	if (now - _lastCacheCleanup < 1)
		return;

	_lastCacheCleanup = now;
	removeList = [OFMutableArray arrayWithCapacity: _cache.count];

	for (OFDNSQuery *query in _cache) {
		OFPair OF_GENERIC(OFDate *, OFDNSResponse *) *entry =
		    [_cache objectForKey: query];
		uint32_t age =
		    (uint32_t)now - [entry.firstObject timeIntervalSince1970];
		OFDNSResponse *response = entry.secondObject;

		if (containsExpiredRecord(response.answerRecords, age) ||
		    containsExpiredRecord(response.authorityRecords, age) ||
		    containsExpiredRecord(response.additionalRecords, age))
			[removeList addObject: query];
	}

	for (OFDNSQuery *query in removeList)
		[_cache removeObjectForKey: query];

	objc_autoreleasePoolPop(pool);
}

- (void)asyncPerformQuery: (OFDNSQuery *)query
		 delegate: (id <OFDNSResolverQueryDelegate>)delegate
{
	[self asyncPerformQuery: query
		    runLoopMode: OFDefaultRunLoopMode
		       delegate: delegate];
}

- (void)asyncPerformQuery: (OFDNSQuery *)query
	      runLoopMode: (OFRunLoopMode)runLoopMode
		 delegate: (id <OFDNSResolverQueryDelegate>)delegate
{
	void *pool = objc_autoreleasePoolPush();
	OFNumber *ID;
	OFDNSResolverContext *context;
	OFPair OF_GENERIC(OFDate *, OFDNSResponse *) *cacheEntry;

	[self of_cleanUpCache];

	if ((cacheEntry = [_cache objectForKey: query]) != nil) {
		uint32_t age =
		    (uint32_t)-[cacheEntry.firstObject timeIntervalSinceNow];
		OFDNSResponse *response = cacheEntry.secondObject;

		if (!containsExpiredRecord(response.answerRecords, age) &&

	if (response != nil)
		[_cache setObject: [OFPair pairWithFirstObject: [OFDate date]
						  secondObject: response]
			   forKey: context->_query];
	else
		[_cache removeObjectForKey: context->_query];

	[self of_cleanUpCache];

	[context->_delegate resolver: self
		     didPerformQuery: context->_query
			    response: response
			   exception: exception];

	return false;