Can I use fabric as a lib in a concurrent way?

Question

I am planning to write a remote agent module as bellow:

from fabric.api import run as fab_run
from fabric.api import env as fab_env


class RemoteAgent(object):
    def __init__(self, host, port, user, password):
        self.host = host
        self.port = port
        self.user = user
        self.password = password

    def set_env(self):
        fab_env.host_string = "%s:%s" % (self.host, self.port)
        fab_env.user = self.user
        fab_env.password = self.password

    def run(self, cmd):
        self.set_env()
        return fab_run(cmd)

So I can use RemoteAgent like this:

ra = RemoteAgent('192.168.1.102', 22, 'worker', 'password')
ra.run('killall java')

But RemoteAgent can not be used concurrently, or there will be a race condition.

My question is: how can use fabric as a lib in a concurrent way?

Answer 1

It depends on type of concurrency you would like to use.

It's not a good idea to use fabric with thread concurrency. Fabric is not thread safe (see last question in FAQ).

There is no problem though using process concurrency with multiprocessing module. Fabric uses it internally to provide their Parallel execution functionality.

Answer 2

There is a parallel decorator in fabric.api, parallel in fabric