python - 引发ValueError('Fileobj必须实现读取')

Question

我正在获取文件大小并将其上传到S3：

def transfer_file_from_ftp_to_s3(bucket_name, ftp_file_path, s3_file_path, ftp_username, ftp_password, chunk_size):
ftp_connection = open_ftp_connection(FTP_HOST, int(FTP_PORT), ftp_username, ftp_password) 
ftp_file = ftp_connection.file(ftp_file_path, 'r')
s3_connection = boto3.client('s3')
ftp_file_size = ftp_file._get_size()

if ftp_file_size <= int(chunk_size):
    #upload file in one go
    print('Transferring complete File from FTP to S3...')
    ftp_file_data = ftp_file.read()
    s3_connection.upload_fileobj(ftp_file_data, bucket_name, s3_file_path)
    print('Successfully Transferred file from FTP to S3!')
    ftp_file.close()

我在下面收到此错误消息：

Transferring complete File from FTP to S3...
Traceback (most recent call last):

  File "/Users/admin/anaconda2/lib/python2.7/site-packages/boto3/s3/inject.py", line 520, in upload_fileobj
    raise ValueError('Fileobj must implement read')

ValueError: Fileobj must implement read

你能给我一些指导吗？谢谢。

Answer 1

您正在上传从文件对象读取的数据，但是方法名称建议您应该传递文件对象本身：

s3_connection.upload_fileobj(ftp_file, bucket_name, s3_file_path)