254 lines
7.5 KiB
Python
254 lines
7.5 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""
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Ansible module to manage mysql variables
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(c) 2013, Balazs Pocze <banyek@gawker.com>
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Certain parts are taken from Mark Theunissen's mysqldb module
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This file is part of Ansible
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Ansible is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Ansible is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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"""
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DOCUMENTATION = '''
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---
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module: mysql_variables
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short_description: Manage MySQL global variables
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description:
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- Query / Set MySQL variables
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version_added: 1.3
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options:
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variable:
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description:
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- Variable name to operate
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required: True
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value:
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description:
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- If set, then sets variable value to this
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required: False
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login_user:
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description:
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- username to connect mysql host, if defined login_password also needed.
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required: False
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login_password:
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description:
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- password to connect mysql host, if defined login_user also needed.
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required: False
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login_host:
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description:
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- mysql host to connect
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required: False
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login_unix_socket:
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description:
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- unix socket to connect mysql server
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'''
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EXAMPLES = '''
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# Check for sync_binlog setting
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- mysql_variables: variable=sync_binlog
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# Set read_only variable to 1
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- mysql_variables: variable=read_only value=1
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'''
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import ConfigParser
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import os
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import warnings
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try:
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import MySQLdb
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except ImportError:
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mysqldb_found = False
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else:
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mysqldb_found = True
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def typedvalue(value):
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"""
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Convert value to number whenever possible, return same value
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otherwise.
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>>> typedvalue('3')
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3
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>>> typedvalue('3.0')
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3.0
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>>> typedvalue('foobar')
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'foobar'
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"""
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try:
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return int(value)
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except ValueError:
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pass
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try:
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return float(value)
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except ValueError:
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pass
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return value
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def getvariable(cursor, mysqlvar):
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cursor.execute("SHOW VARIABLES LIKE '" + mysqlvar + "'")
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mysqlvar_val = cursor.fetchall()
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return mysqlvar_val
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def setvariable(cursor, mysqlvar, value):
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""" Set a global mysql variable to a given value
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The DB driver will handle quoting of the given value based on its
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type, thus numeric strings like '3.0' or '8' are illegal, they
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should be passed as numeric literals.
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"""
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try:
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cursor.execute("SET GLOBAL " + mysqlvar + " = %s", (value,))
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cursor.fetchall()
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result = True
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except Exception, e:
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result = str(e)
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return result
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def strip_quotes(s):
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""" Remove surrounding single or double quotes
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>>> print strip_quotes('hello')
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hello
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>>> print strip_quotes('"hello"')
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hello
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>>> print strip_quotes("'hello'")
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hello
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>>> print strip_quotes("'hello")
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'hello
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"""
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single_quote = "'"
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double_quote = '"'
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if s.startswith(single_quote) and s.endswith(single_quote):
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s = s.strip(single_quote)
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elif s.startswith(double_quote) and s.endswith(double_quote):
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s = s.strip(double_quote)
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return s
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def config_get(config, section, option):
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""" Calls ConfigParser.get and strips quotes
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See: http://dev.mysql.com/doc/refman/5.0/en/option-files.html
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"""
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return strip_quotes(config.get(section, option))
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def load_mycnf():
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config = ConfigParser.RawConfigParser()
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mycnf = os.path.expanduser('~/.my.cnf')
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if not os.path.exists(mycnf):
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return False
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try:
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config.readfp(open(mycnf))
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except (IOError):
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return False
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# We support two forms of passwords in .my.cnf, both pass= and password=,
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# as these are both supported by MySQL.
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try:
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passwd = config_get(config, 'client', 'password')
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except (ConfigParser.NoOptionError):
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try:
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passwd = config_get(config, 'client', 'pass')
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except (ConfigParser.NoOptionError):
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return False
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# If .my.cnf doesn't specify a user, default to user login name
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try:
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user = config_get(config, 'client', 'user')
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except (ConfigParser.NoOptionError):
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user = getpass.getuser()
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creds = dict(user=user, passwd=passwd)
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return creds
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def main():
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module = AnsibleModule(
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argument_spec = dict(
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login_user=dict(default=None),
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login_password=dict(default=None),
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login_host=dict(default="localhost"),
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login_unix_socket=dict(default=None),
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variable=dict(default=None),
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value=dict(default=None)
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)
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)
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user = module.params["login_user"]
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password = module.params["login_password"]
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host = module.params["login_host"]
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mysqlvar = module.params["variable"]
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value = module.params["value"]
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if not mysqldb_found:
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module.fail_json(msg="the python mysqldb module is required")
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else:
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warnings.filterwarnings('error', category=MySQLdb.Warning)
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# Either the caller passes both a username and password with which to connect to
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# mysql, or they pass neither and allow this module to read the credentials from
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# ~/.my.cnf.
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login_password = module.params["login_password"]
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login_user = module.params["login_user"]
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if login_user is None and login_password is None:
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mycnf_creds = load_mycnf()
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if mycnf_creds is False:
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login_user = "root"
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login_password = ""
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else:
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login_user = mycnf_creds["user"]
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login_password = mycnf_creds["passwd"]
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elif login_password is None or login_user is None:
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module.fail_json(msg="when supplying login arguments, both login_user and login_password must be provided")
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try:
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if module.params["login_unix_socket"]:
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db_connection = MySQLdb.connect(host=module.params["login_host"], unix_socket=module.params["login_unix_socket"], user=login_user, passwd=login_password, db="mysql")
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else:
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db_connection = MySQLdb.connect(host=module.params["login_host"], user=login_user, passwd=login_password, db="mysql")
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cursor = db_connection.cursor()
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except Exception, e:
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module.fail_json(msg="unable to connect to database, check login_user and login_password are correct or ~/.my.cnf has the credentials")
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if mysqlvar is None:
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module.fail_json(msg="Cannot run without variable to operate with")
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mysqlvar_val = getvariable(cursor, mysqlvar)
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if value is None:
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module.exit_json(msg=mysqlvar_val)
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else:
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if len(mysqlvar_val) < 1:
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module.fail_json(msg="Variable not available", changed=False)
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# Type values before using them
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value_wanted = typedvalue(value)
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value_actual = typedvalue(mysqlvar_val[0][1])
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if value_wanted == value_actual:
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module.exit_json(msg="Variable already set to requested value", changed=False)
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result = setvariable(cursor, mysqlvar, value_wanted)
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if result is True:
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module.exit_json(msg="Variable change succeeded prev_value=%s" % value_actual, changed=True)
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else:
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module.fail_json(msg=result, changed=False)
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# import module snippets
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from ansible.module_utils.basic import *
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main()
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