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POMost efficient way to read from external accessory input stream and push to s3?
 

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    <p>I am trying to read up to max 2MB from an external accessory via bluetooth and its taking a lot longer than expected. We are optimising on the external accessory side of things but I am looking also for a more efficient way to write the data to a temporary file before uploading it to s3 or even better just piping the inputstream straight to s3.</p> <p>At the moment we have a very simple mechanism which is pretty much based on the EADemo code and aws examples:</p> <pre><code>// low level read method - read data while there is data and space available in the input buffer - (void)_readData { #define INPUT_BUFFER_SIZE 1024 uint8_t buf[INPUT_BUFFER_SIZE]; while ([[_session inputStream] hasBytesAvailable]) { NSInteger bytesRead = [[_session inputStream] read:buf maxLength:INPUT_BUFFER_SIZE]; if (_readData == nil) { _readData = [[NSMutableData alloc] init]; } [_readData appendBytes:(void *)buf length:bytesRead]; } [[NSNotificationCenter defaultCenter] postNotificationName:SessionDataReceivedNotification object:self userInfo:nil]; } </code></pre> <p>And our _sessionDataReceived:</p> <pre><code>- (void)_sessionDataReceived:(NSNotification *)notification { SessionController *sessionController = (SessionController *)[notification object]; uint32_t bytesAvailable = 0; NSData *streamData; while ((bytesAvailable = [sessionController readBytesAvailable]) &gt; 0) { streamData = [sessionController readData:bytesAvailable]; } if (![_fileMgr fileExistsAtPath:_deviceFile]) { [_fileMgr createFileAtPath:_deviceFile contents:nil attributes:nil]; } NSFileHandle *fileHandle = [NSFileHandle fileHandleForUpdatingAtPath:_deviceFile]; [fileHandle seekToEndOfFile]; [fileHandle writeData:streamData]; [fileHandle closeFile]; NSDictionary *attributes = [_fileMgr attributesOfItemAtPath:_deviceFile error:NULL]; unsigned long long fileSize = [attributes fileSize]; if (fileSize == (ourExpectedBytesSize)) { [self sendToS3]; } } </code></pre> <p>And our sendToS3:</p> <pre><code>- (void)sendToS3 { _s3filekey = [NSString stringWithFormat:@"%@/files/%@", user, _deviceFilename]; AmazonS3Client *s3 = [self s3Client]; S3TransferManager *tm = [S3TransferManager new]; tm.delegate = self; tm.s3 = s3; S3PutObjectRequest *por = [[S3PutObjectRequest alloc] initWithKey:_s3filekey inBucket:_uploadBucket]; por.requestTag = @"sendToS3"; por.filename = _deviceFile; [tm upload:por]; } </code></pre> <p>What would be the best way to get and push this data to s3 as fast/efficiently as possible?</p>
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