worksmith_etcd

Etcd activities for worksmith

This package contains the following activities/tasks:

name	description
createClient	Creates an etcd client
lock	Creates a distributed lock using etcd
unlock	Releases a distributed lock created with the lock activity

createClient activity

Creates an etcd client

params

name	type	description
hosts	array	Array of hosts

example

var worksmith = require('worksmith')
worksmith.use('etcd', require('worksmith_etcd'))
var workflow = worksmith({task:"sequence", items : [{
    task:'etcd/createClient',
    hosts: ['localhost:4001']
    resultTo: 'etcd'
}])

lock activity

Creates a distributed lock using etcd

params

name	type	description
etcd	etcd client	The etcd client (if not specified expected to be in the context 'etcd' property)
key	string	The etcd key to be used in the lock
value	string	Optional value for the lock, defaults to a uuid
ttl	integer	Optional time in secords before the lock automatically expires

example

var worksmith = require('worksmith')
worksmith.use('etcd', require('worksmith_etcd'))
var workflow = worksmith({task:"sequence", items : [{
    task:'etcd/createClient',
    hosts: ['localhost:4001']
    resultTo: 'etcd'
}, {
    task:"etcd/lock",
    key:"record_12345"
    resultTo: "lock.value"
}])

unlock activity

Releases a distributed lock created with the lock activity

params

name	type	description
etcd	etcd client	The etcd client (if not specified expected to be in the context 'etcd' property)
key	string	The etcd key to be used in the lock
value	string	Optional value for the lock. If specified both the key and lock must match

example

var worksmith = require('worksmith')
worksmith.use('etcd', require('worksmith_etcd'))
var workflow = worksmith({task:"sequence", items : [{
    task:'etcd/createClient',
    hosts: ['localhost:4001']
    resultTo: 'etcd'
}, {
    task:"etcd/unlock",
    key:"record_12345"
}])

Running tests

You need an etcd server running on localhost:4001 for the tests to pass. If you have docker and docker-compose installed simply run docker-compose up in the route of this project, however watch out for this bug.