#!/usr/bin/python
# -*- coding: utf-8 -*-
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see .
DOCUMENTATION = '''
---
module: redis
short_description: Various redis commands, slave and flush
description:
- Unified utility to interact with redis instances.
'slave' Sets a redis instance in slave or master mode.
'flush' Flushes all the instance or a specified db.
version_added: "1.3"
options:
command:
description:
- The selected redis command
required: true
default: null
choices: [ "slave", "flush" ]
login_password:
description:
- The password used to authenticate with (usually not used)
required: false
default: null
login_host:
description:
- The host running the database
required: false
default: localhost
login_port:
description:
- The port to connect to
required: false
default: 6379
master_host:
description:
- The host of the master instance [slave command]
required: false
default: null
master_port:
description:
- The port of the master instance [slave command]
required: false
default: null
slave_mode:
description:
- the mode of the redis instance [slave command]
required: false
default: slave
choices: [ "master", "slave" ]
db:
description:
- The database to flush (used in db mode) [flush command]
required: false
default: null
flush_mode:
description:
- Type of flush (all the dbs in a redis instance or a specific one)
[flush command]
required: false
default: all
choices: [ "all", "db" ]
notes:
- Requires the redis-py Python package on the remote host. You can
install it with pip (pip install redis) or with a package manager.
https://github.com/andymccurdy/redis-py
- If the redis master instance we are making slave of is password protected
this needs to be in the redis.conf in the masterauth variable
requirements: [ redis ]
author: Xabier Larrakoetxea
'''
EXAMPLES = '''
# Set local redis instance to be slave of melee.island on port 6377
- redis: command=slave master_host=melee.island master_port=6377
# Deactivate slave mode
- redis: command=slave slave_mode=master
# Flush all the redis db
- redis: command=flush flush_mode=all
# Flush only one db in a redis instance
- redis: command=flush db=1 flush_mode=db
'''
try:
import redis
except ImportError:
redis_found = False
else:
redis_found = True
# ===========================================
# Redis module specific support methods.
#
def set_slave_mode(client, master_host, master_port):
try:
return client.slaveof(master_host, master_port)
except Exception:
return False
def set_master_mode(client):
try:
return client.slaveof()
except Exception:
return False
def flush(client, db=None):
try:
if type(db) != int:
return client.flushall()
else:
# The passed client has been connected to the database already
return client.flushdb()
except Exception:
return False
# ===========================================
# Module execution.
#
def main():
module = AnsibleModule(
argument_spec = dict(
command=dict(default=None, choices=['slave', 'flush']),
login_password=dict(default=None),
login_host=dict(default='localhost'),
login_port=dict(default='6379'),
master_host=dict(default=None),
master_port=dict(default=None),
slave_mode=dict(default='slave', choices=['master', 'slave']),
db=dict(default=None),
flush_mode=dict(default='all', choices=['all', 'db']),
),
supports_check_mode = True
)
if not redis_found:
module.fail_json(msg="python redis module is required")
login_password = module.params['login_password']
login_host = module.params['login_host']
login_port = int(module.params['login_port'])
command = module.params['command']
# Slave Command section -----------
if command == "slave":
master_host = module.params['master_host']
master_port = module.params['master_port']
try:
master_port = int(module.params['master_port'])
except Exception:
pass
mode = module.params['slave_mode']
#Check if we ahve all the data
if mode == "slave": # Only need data if we want to be slave
if not master_host:
module.fail_json(
msg='In slave mode master host must be provided')
if not master_port:
module.fail_json(
msg='In slave mode master port must be provided')
#Connect and check
r = redis.StrictRedis(host=login_host,
port=login_port,
password=login_password)
try:
r.ping()
except Exception, e:
module.fail_json(msg="unable to connect to database: %s" % e)
#Check if we are already in the mode that we want
info = r.info()
if mode == "master" and info["role"] == "master":
module.exit_json(changed=False, mode=mode)
elif mode == "slave" and\
info["role"] == "slave" and\
info["master_host"] == master_host and\
info["master_port"] == master_port:
status = {
'status': mode,
'master_host': master_host,
'master_port': master_port,
}
module.exit_json(changed=False, mode=status)
else:
# Do the stuff
# (Check Check_mode before commands so the commands aren't evaluated
# if not necesary)
if mode == "slave":
if module.check_mode or\
set_slave_mode(r, master_host, master_port):
info = r.info()
status = {
'status': mode,
'master_host': master_host,
'master_port': master_port,
}
module.exit_json(changed=True, mode=status)
else:
module.fail_json(msg='Unable to set slave mode')
else:
if module.check_mode or set_master_mode(r):
module.exit_json(changed=True, mode=mode)
else:
module.fail_json(msg='Unable to set master mode')
# flush Command section -----------
elif command == "flush":
try:
db = int(module.params['db'])
except Exception:
db = 0
mode = module.params['flush_mode']
#Check if we have all the data
if mode == "db":
if type(db) != int:
module.fail_json(
msg="In db mode the db number must be provided")
#Connect and check
r = redis.StrictRedis(host=login_host,
port=login_port,
password=login_password,
db=db)
try:
r.ping()
except Exception, e:
module.fail_json(msg="unable to connect to database: %s" % e)
# Do the stuff
# (Check Check_mode before commands so the commands aren't evaluated
# if not necesary)
if mode == "all":
if module.check_mode or flush(r):
module.exit_json(changed=True, flushed=True)
else: # Flush never fails :)
module.fail_json(msg="Unable to flush all databases")
else:
if module.check_mode or flush(r, db):
module.exit_json(changed=True, flushed=True, db=db)
else: # Flush never fails :)
module.fail_json(msg="Unable to flush '%d' database" % db)
else:
module.fail_json(msg='A valid command must be provided')
# this is magic, see lib/ansible/module_common.py
#<>
main()