Question

我试图通过蓝牙从外部附件读取最多2MB，并且比预期花费的时间更长。我们正在对外部附件方面进行优化，但我还希望能够在将数据上传到s3之前将数据写入临时文件的更有效方法，甚至更好地将输入流直接输入到s3。

目前我们有一个非常简单的机制，它几乎基于EADemo代码和示例：

// 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];
}

我们的_sessionDataReceived：

- (void)_sessionDataReceived:(NSNotification *)notification
{
    SessionController *sessionController = (SessionController *)[notification object];
    uint32_t bytesAvailable = 0;
    NSData *streamData;

    while ((bytesAvailable = [sessionController readBytesAvailable]) > 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];
    }
}

我们的sendToS3：

- (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];
}

尽可能快速/有效地将这些数据推送到s3的最佳方式是什么？

Answer 1

您可能想尝试在后台线程中将数据发送到S3。

从外部附件输入流读取并推送到s3的最有效方法？

1 个答案: