/usher

Distributed Lock Server Implemented in Python

Primary LanguagePythonOtherNOASSERTION

Usher

A simple TCP-based distributed locking solution

Author: Luke Campbell < lcampbell at-thingy asascience dot-ish commercial domain >

Installation

  1. Get libevent

    On Mac: brew install libevent

    On Ubuntu: sudo apt-get install libevent-dev

  2. Install

    python setup.py install

Running the server

Run the server with the usher-server command.

usher-server -l DEBUG -p 9090

usage: usher-server [-h] [-l LOG_LEVEL] [-i INTERFACE] [-p PORT]

optional arguments:
  -h, --help            show this help message and exit
  -l LOG_LEVEL, --log-level LOG_LEVEL
                        set the log level
  -i INTERFACE, --interface INTERFACE
                        the ip-address or host of the interface to listen on
  -p PORT, --port PORT  port to listen on

Using the locks!

Install usher on any python environment where you wish to use the locks.

In a python application:

from usher.tcp_client import UsherTCPClient, UsherLock
host = 'localhost'
port = 9090

client = UsherTCPClient(host, port)
lock = UsherLock(client, '/lock-example', timeout=10)

with lock:
    # Do whatever you need to, safely
    do_something()

# The lock is automatically freed at the end