import argparse
import alibabacloud_oss_v2 as oss

parser = argparse.ArgumentParser(description="open file sample")
parser.add_argument('--region', help='The region in which the bucket is located.', required=True)
parser.add_argument('--bucket', help='The name of the bucket.', required=True)
parser.add_argument('--endpoint', help='The domain names that other services can use to access OSS')
parser.add_argument('--key', help='The name of the object.', required=True)


def main():

    args = parser.parse_args()

    # Loading credentials values from the environment variables
    credentials_provider = oss.credentials.EnvironmentVariableCredentialsProvider()

    # Using the SDK's default configuration
    cfg = oss.config.load_default()
    cfg.credentials_provider = credentials_provider
    cfg.region = args.region
    if args.endpoint is not None:
        cfg.endpoint = args.endpoint

    client = oss.Client(cfg)

    result = client.open_file()

    # result = client.open_file(
    #     bucket=args.bucket,
    #     key=args.key,
    #     enable_prefetch=True,
    #     prefetch_num=2,
    #     chunk_size=1,
    #     prefetch_threshold=10,
    #     block_size=10,
    # )

    print(f'content: {result.read().decode()}')
    result.close()


if __name__ == "__main__":
    main()

