ansible/database/mysql/mysql_replication.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

"""

Ansible module to manage mysql replication
(c) 2013, Balazs Pocze <banyek@gawker.com>
Certain parts are taken from Mark Theunissen's mysqldb module

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 <http://www.gnu.org/licenses/>.
"""

DOCUMENTATION = '''
---
module: mysql_replication

short_description: Manage MySQL replication
description:
    - Manages MySQL server replication, slave, master status get and change master host.
version_added: "1.3"
author: "Balazs Pocze (@banyek)" 
options:
    mode:
        description:
            - module operating mode. Could be getslave (SHOW SLAVE STATUS), getmaster (SHOW MASTER STATUS), changemaster (CHANGE MASTER TO), startslave (START SLAVE), stopslave (STOP SLAVE), resetslave (RESET SLAVE), resetslaveall (RESET SLAVE ALL)
        required: False
        choices:
            - getslave
            - getmaster
            - changemaster
            - stopslave
            - startslave
            - resetslave
            - resetslaveall
        default: getslave
    login_user:
        description:
            - username to connect mysql host, if defined login_password also needed.
        required: False
    login_password:
        description:
            - password to connect mysql host, if defined login_user also needed.
        required: False
    login_host:
        description:
            - mysql host to connect
        required: False
    login_port:
        description:
            - Port of the MySQL server. Requires login_host be defined as other then localhost if login_port is used
        required: False
        default: 3306
        version_added: "1.9"
    login_unix_socket:
        description:
            - unix socket to connect mysql server
    master_host:
        description:
            - same as mysql variable
    master_user:
        description:
            - same as mysql variable
    master_password:
        description:
            - same as mysql variable
    master_port:
        description:
            - same as mysql variable
    master_connect_retry:
        description:
            - same as mysql variable
    master_log_file:
        description:
            - same as mysql variable
    master_log_pos:
        description:
            - same as mysql variable
    relay_log_file:
        description:
            - same as mysql variable
    relay_log_pos:
        description:
            - same as mysql variable
    master_ssl:
        description:
            - same as mysql variable
        choices: [ 0, 1 ]
    master_ssl_ca:
        description:
            - same as mysql variable
    master_ssl_capath:
        description:
            - same as mysql variable
    master_ssl_cert:
        description:
            - same as mysql variable
    master_ssl_key:
        description:
            - same as mysql variable
    master_ssl_cipher:
        description:
            - same as mysql variable
    master_auto_position:
        description:
            - does the host uses GTID based replication or not
        required: false
        default: null
        version_added: "2.0"
'''

EXAMPLES = '''
# Stop mysql slave thread
- mysql_replication: mode=stopslave

# Get master binlog file name and binlog position
- mysql_replication: mode=getmaster

# Change master to master server 192.168.1.1 and use binary log 'mysql-bin.000009' with position 4578
- mysql_replication: mode=changemaster master_host=192.168.1.1 master_log_file=mysql-bin.000009 master_log_pos=4578

# Check slave status using port 3308
- mysql_replication: mode=getslave login_host=ansible.example.com login_port=3308
'''

import ConfigParser
import os
import warnings

try:
    import MySQLdb
except ImportError:
    mysqldb_found = False
else:
    mysqldb_found = True


def get_master_status(cursor):
    cursor.execute("SHOW MASTER STATUS")
    masterstatus = cursor.fetchone()
    return masterstatus


def get_slave_status(cursor):
    cursor.execute("SHOW SLAVE STATUS")
    slavestatus = cursor.fetchone()
    return slavestatus


def stop_slave(cursor):
    try:
        cursor.execute("STOP SLAVE")
        stopped = True
    except:
        stopped = False
    return stopped


def reset_slave(cursor):
    try:
        cursor.execute("RESET SLAVE")
        reset = True
    except:
        reset = False
    return reset


def reset_slave_all(cursor):
    try:
        cursor.execute("RESET SLAVE ALL")
        reset = True
    except:
        reset = False
    return reset


def start_slave(cursor):
    try:
        cursor.execute("START SLAVE")
        started = True
    except:
        started = False
    return started


def changemaster(cursor, chm, chm_params):
    sql_param = ",".join(chm)
    query = 'CHANGE MASTER TO %s' % sql_param
    cursor.execute(query, chm_params)


def strip_quotes(s):
    """ Remove surrounding single or double quotes

    >>> print strip_quotes('hello')
    hello
    >>> print strip_quotes('"hello"')
    hello
    >>> print strip_quotes("'hello'")
    hello
    >>> print strip_quotes("'hello")
    'hello

    """
    single_quote = "'"
    double_quote = '"'

    if s.startswith(single_quote) and s.endswith(single_quote):
        s = s.strip(single_quote)
    elif s.startswith(double_quote) and s.endswith(double_quote):
        s = s.strip(double_quote)
    return s


def config_get(config, section, option):
    """ Calls ConfigParser.get and strips quotes

    See: http://dev.mysql.com/doc/refman/5.0/en/option-files.html
    """
    return strip_quotes(config.get(section, option))


def load_mycnf():
    config = ConfigParser.RawConfigParser()
    mycnf = os.path.expanduser('~/.my.cnf')
    if not os.path.exists(mycnf):
        return False
    try:
        config.readfp(open(mycnf))
    except (IOError):
        return False
    # We support two forms of passwords in .my.cnf, both pass= and password=,
    # as these are both supported by MySQL.
    try:
        passwd = config_get(config, 'client', 'password')
    except (ConfigParser.NoOptionError):
        try:
            passwd = config_get(config, 'client', 'pass')
        except (ConfigParser.NoOptionError):
            return False

    # If .my.cnf doesn't specify a user, default to user login name
    try:
        user = config_get(config, 'client', 'user')
    except (ConfigParser.NoOptionError):
        user = getpass.getuser()
    creds = dict(user=user, passwd=passwd)
    return creds


def main():
    module = AnsibleModule(
            argument_spec = dict(
            login_user=dict(default=None),
            login_password=dict(default=None),
            login_host=dict(default="localhost"),
            login_port=dict(default=3306, type='int'),
            login_unix_socket=dict(default=None),
            mode=dict(default="getslave", choices=["getmaster", "getslave", "changemaster", "stopslave", "startslave"]),
            master_auto_position=dict(default=False, type='bool'),
            master_host=dict(default=None),
            master_user=dict(default=None),
            master_password=dict(default=None),
            master_port=dict(default=None, type='int'),
            master_connect_retry=dict(default=None, type='int'),
            master_log_file=dict(default=None),
            master_log_pos=dict(default=None, type='int'),
            relay_log_file=dict(default=None),
            relay_log_pos=dict(default=None, type='int'),
            master_ssl=dict(default=False, type='bool'),
            master_ssl_ca=dict(default=None),
            master_ssl_capath=dict(default=None),
            master_ssl_cert=dict(default=None),
            master_ssl_key=dict(default=None),
            master_ssl_cipher=dict(default=None),
        )
    )
    user = module.params["login_user"]
    password = module.params["login_password"]
    host = module.params["login_host"]
    port = module.params["login_port"]
    mode = module.params["mode"]
    master_host = module.params["master_host"]
    master_user = module.params["master_user"]
    master_password = module.params["master_password"]
    master_port = module.params["master_port"]
    master_connect_retry = module.params["master_connect_retry"]
    master_log_file = module.params["master_log_file"]
    master_log_pos = module.params["master_log_pos"]
    relay_log_file = module.params["relay_log_file"]
    relay_log_pos = module.params["relay_log_pos"]
    master_ssl = module.params["master_ssl"]
    master_ssl_ca = module.params["master_ssl_ca"]
    master_ssl_capath = module.params["master_ssl_capath"]
    master_ssl_cert = module.params["master_ssl_cert"]
    master_ssl_key = module.params["master_ssl_key"]
    master_ssl_cipher = module.params["master_ssl_cipher"]
    master_auto_position = module.params["master_auto_position"]

    if not mysqldb_found:
        module.fail_json(msg="the python mysqldb module is required")
    else:
        warnings.filterwarnings('error', category=MySQLdb.Warning)

    # Either the caller passes both a username and password with which to connect to
    # mysql, or they pass neither and allow this module to read the credentials from
    # ~/.my.cnf.
    login_password = module.params["login_password"]
    login_user = module.params["login_user"]
    if login_user is None and login_password is None:
        mycnf_creds = load_mycnf()
        if mycnf_creds is False:
            login_user = "root"
            login_password = ""
        else:
            login_user = mycnf_creds["user"]
            login_password = mycnf_creds["passwd"]
    elif login_password is None or login_user is None:
        module.fail_json(msg="when supplying login arguments, both login_user and login_password must be provided")

    try:
        if module.params["login_unix_socket"]:
            db_connection = MySQLdb.connect(host=module.params["login_host"], unix_socket=module.params["login_unix_socket"], user=login_user, passwd=login_password)
        elif module.params["login_port"] != 3306 and module.params["login_host"] == "localhost":
            module.fail_json(msg="login_host is required when login_port is defined, login_host cannot be localhost when login_port is defined")
        else:
            db_connection = MySQLdb.connect(host=module.params["login_host"], port=module.params["login_port"], user=login_user, passwd=login_password)
    except Exception, e:
        module.fail_json(msg="unable to connect to database, check login_user and login_password are correct or ~/.my.cnf has the credentials")
    try:
        cursor = db_connection.cursor(cursorclass=MySQLdb.cursors.DictCursor)
    except Exception, e:
        module.fail_json(msg="Trouble getting DictCursor from db_connection: %s" % e)

    if mode in "getmaster":
        masterstatus = get_master_status(cursor)
        try:
            module.exit_json( **masterstatus )
        except TypeError:
            module.fail_json(msg="Server is not configured as mysql master")

    elif mode in "getslave":
        slavestatus = get_slave_status(cursor)
        try:
            module.exit_json( **slavestatus )
        except TypeError:
            module.fail_json(msg="Server is not configured as mysql slave")

    elif mode in "changemaster":
        chm=[]
        chm_params = {}
        if master_host:
            chm.append("MASTER_HOST=%(master_host)s")
            chm_params['master_host'] = master_host
        if master_user:
            chm.append("MASTER_USER=%(master_user)s")
            chm_params['master_user'] = master_user
        if master_password:
            chm.append("MASTER_PASSWORD=%(master_password)s")
            chm_params['master_password'] = master_password
        if master_port is not None:
            chm.append("MASTER_PORT=%(master_port)s")
            chm_params['master_port'] = master_port
        if master_connect_retry is not None:
            chm.append("MASTER_CONNECT_RETRY=%(master_connect_retry)s")
            chm_params['master_connect_retry'] = master_connect_retry
        if master_log_file:
            chm.append("MASTER_LOG_FILE=%(master_log_file)s")
            chm_params['master_log_file'] = master_log_file
        if master_log_pos is not None:
            chm.append("MASTER_LOG_POS=%(master_log_pos)s")
            chm_params['master_log_pos'] = master_log_pos
        if relay_log_file:
            chm.append("RELAY_LOG_FILE=%(relay_log_file)s")
            chm_params['relay_log_file'] = relay_log_file
        if relay_log_pos is not None:
            chm.append("RELAY_LOG_POS=%(relay_log_pos)s")
            chm_params['relay_log_pos'] = relay_log_pos
        if master_ssl:
            chm.append("MASTER_SSL=1")
        if master_ssl_ca:
            chm.append("MASTER_SSL_CA=%(master_ssl_ca)s")
            chm_params['master_ssl_ca'] = master_ssl_ca
        if master_ssl_capath:
            chm.append("MASTER_SSL_CAPATH=%(master_ssl_capath)s")
            chm_params['master_ssl_capath'] = master_ssl_capath
        if master_ssl_cert:
            chm.append("MASTER_SSL_CERT=%(master_ssl_cert)s")
            chm_params['master_ssl_cert'] = master_ssl_cert
        if master_ssl_key:
            chm.append("MASTER_SSL_KEY=%(master_ssl_key)s")
            chm_params['master_ssl_key'] = master_ssl_key
        if master_ssl_cipher:
            chm.append("MASTER_SSL_CIPHER=%(master_ssl_cipher)s")
            chm_params['master_ssl_cipher'] = master_ssl_cipher
        if master_auto_position:
            chm.append("MASTER_AUTO_POSITION = 1")
        changemaster(cursor, chm, chm_params)
        module.exit_json(changed=True)
    elif mode in "startslave":
        started = start_slave(cursor)
        if started is True:
            module.exit_json(msg="Slave started ", changed=True)
        else:
            module.exit_json(msg="Slave already started (Or cannot be started)", changed=False)
    elif mode in "stopslave":
        stopped = stop_slave(cursor)
        if stopped is True:
            module.exit_json(msg="Slave stopped", changed=True)
        else:
            module.exit_json(msg="Slave already stopped", changed=False)
    elif mode in "resetslave":
        reset = reset_slave(cursor)
        if reset is True:
            module.exit_json(msg="Slave reset", changed=True)
        else:
            module.exit_json(msg="Slave already reset", changed=False)
    elif mode in "resetslaveall":
        reset = reset_slave_all(cursor)
        if reset is True:
            module.exit_json(msg="Slave reset", changed=True)
        else:
            module.exit_json(msg="Slave already reset", changed=False)

# import module snippets
from ansible.module_utils.basic import *
main()
warnings.simplefilter("ignore")