Scow-Sync

A file transfer system tool on SCOW

Install

from source code

Clone the repository in a directory that sudoer have access to, then executesudo bash install.sh.

Config

You can edit the scow_sync/config.py to configure the default path.

Edit the SHEBANG_PATH to use the interpreter that you want. If you update the SHEBANG_PATH, you must execute the sudo bash install.sh update to update the shebang of scow-sync, scow-sync-query, scow-sync-start, scow-sync-terminate.

You'd better edit the SCOWSYNC_PATH with ~/ that each user will have his own directory.

split large files

Scow-sync will split large files automatically, and then open several TCP connections concurrently to improve transmission performance.

You can edit the SPLIT_THRESHOLD and the SPLIT_CHUNK_SIZE in the config.py

Start

background

You can use the following command for transfer, but the command will return immediately. That is, it starts a transfer in the background. If you first execute the command, it will create the directory SCOWSYNC_PATH, file LOG_PATH and file ERROR_PATH to store the transfer information including the transferring log and error log. You can configure these paths in the config.py.

scow-sync-start [-h] [-a ADDRESS] [-u USER] [-s SOURCE] [-d DESTINATION] [-p PORT] [-k SSHKEY_PATH]

Optional arguments:

-h, --help show help message and exit

-a ADDRESS, --address ADDRESS address of the server

-u USER, --user USER username for logging in to the server

-s SOURCE, --source SOURCE path to the source file or directory

-d DESTINATION, --destination DESTINATION path to the destination directory

-p PORT, --port PORT port of the server

-k SSHKEY_PATH, --sshkey_path PATH path of private key

-c, --check check whether the private key is right and return true or false

Attention:

1. If you want to use the -c, --check parameter, please make sure that the key verification on the remote machine has a higher priority than password authentication.

2. In fact, the scow-sync-start command will create a directory which is named by the Transfer Id of this time to store the infomation include progress, speed and so on. You can use the scow-sync-query command to view the transfer information.

frontground

Just replace the scow-sync-start command with scow-sync. It will print the message of log and error on shell.

Query

You can use the following command to view the real-time transfer process.

scow-sync-query

It will return an array of json object like:

[{
  "recvAddress": recv_address, 
  "filePath": file_path, 
  "transferSize": transfer_size,
  "progress": progress, 
  "speed": speed, 
  "leftTime": time,
}...]

Terminate

You can use the following command to terminate the transfer process. But you should note that the shutdown of the process is at the granularity of the rsync service. It will then restart the rsync service but with --exclude to exclude the files that have been terminated.

scow-sync-terminate [-h] [-a ADDRESS] [-u USER] [-s SOURCE] [-p PORT] [-k SSHKEY_PATH]

Optional arguments:

-h, --help show this help message and exit

-a ADDRESS, --address ADDRESS address of the server

-u USER, --user USER username for logging in to the server

-s SOURCE, --source SOURCE path to the source file or directory

Performance

parallel

The bandwidth of the network environment is 100Mbps, and the delay is 50ms.

The size of each file is 20MB in multiple files.

dynamic compress

The test data has a total of 20 files of 100MB in size, of which "files hard compressed"(high degree of disorder, compression can reduce the volume by 25%) and "files easily compressed" (with less disorder, compression can reduce volume by 90%) are both half of the files.