ansible/library/postgresql_db

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#!/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 <http://www.gnu.org/licenses/>.
DOCUMENTATION = '''
---
module: postgresql_db
short_description: Add or remove PostgreSQL databases from a remote host.
description:
- Add or remove PostgreSQL databases from a remote host.
version_added: "0.6"
options:
name:
description:
- name of the database to add or remove
required: true
default: null
login_user:
description:
- The username used to authenticate with
required: false
default: null
login_password:
description:
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- The password used to authenticate with
required: false
default: null
login_host:
description:
- Host running the database
required: false
default: localhost
owner:
description:
- Name of the role to set as owner of the database
required: false
default: null
template:
description:
- Template used to create the database
required: false
default: null
encoding:
description:
- Encoding of the database
required: false
default: null
encoding:
description:
- Encoding of the database
required: false
default: null
state:
description:
- The database state
required: false
default: present
choices: [ "present", "absent" ]
examples:
- code: "postgresql_db: db=acme"
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description: Create a new database with name C(acme)
notes:
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- The default authentication assumes that you are either logging in as or sudo'ing to the C(postgres) account on the host.
- This module uses I(psycopg2), a Python PostgreSQL database adapter. You must ensure that psycopg2 is installed on
the host before using this module. If the remote host is the PostgreSQL server (which is the default case), then PostgreSQL must also be installed on the remote host. For Ubuntu-based systems, install the C(postgresql), C(libpq-dev), and C(python-psycopg2) packages on the remote host before using this module.
requirements: [ psycopg2 ]
author: Lorin Hochstein
'''
try:
import psycopg2
except ImportError:
postgresqldb_found = False
else:
postgresqldb_found = True
# ===========================================
# PostgreSQL module specific support methods.
#
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def set_owner(cursor, db, owner):
query = "ALTER DATABASE \"%s\" OWNER TO \"%s\"" % (db, owner)
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cursor.execute(query)
return True
def db_owned_by(cursor, db, user):
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query = """SELECT * FROM pg_database JOIN pg_user ON datdba = usesysid
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WHERE usename = %(user)s and datname = %(db)s"""
cursor.execute(query, {'db':db, 'user':user})
return cursor.rowcount == 1
def db_exists(cursor, db):
query = "SELECT * FROM pg_database WHERE datname=%(db)s"
cursor.execute(query, {'db': db})
return cursor.rowcount == 1
def db_delete(cursor, db):
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if db_exists(cursor, db):
query = "DROP DATABASE \"%s\"" % db
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cursor.execute(query)
return True
else:
return False
def db_create(cursor, db, owner, template, encoding):
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if not db_exists(cursor, db):
if owner:
owner = " OWNER \"%s\"" % owner
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if template:
template = " TEMPLATE \"%s\"" % template
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if encoding:
encoding = " ENCODING '%s'" % encoding
query = "CREATE DATABASE \"%s\"%s%s%s" % (db, owner, template, encoding)
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cursor.execute(query)
return True
elif owner and not db_owned_by(cursor, db, owner):
return set_owner(cursor, db, owner)
else:
return False
# ===========================================
# Module execution.
#
def main():
module = AnsibleModule(
argument_spec=dict(
login_user=dict(default="postgres"),
login_password=dict(default=""),
login_host=dict(default=""),
port=dict(default="5432"),
db=dict(required=True, aliases=['name']),
owner=dict(default=""),
template=dict(default=""),
encoding=dict(default=""),
state=dict(default="present", choices=["absent", "present"]),
),
supports_check_mode = True
)
if not postgresqldb_found:
module.fail_json(msg="the python psycopg2 module is required")
db = module.params["db"]
port = module.params["port"]
owner = module.params["owner"]
template = module.params["template"]
encoding = module.params["encoding"]
state = module.params["state"]
changed = False
# To use defaults values, keyword arguments must be absent, so
# check which values are empty and don't include in the **kw
# dictionary
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params_map = {
"login_host":"host",
"login_user":"user",
"login_password":"password",
"port":"port"
}
kw = dict( (params_map[k], v) for (k, v) in module.params.iteritems()
if k in params_map and v != '' )
try:
db_connection = psycopg2.connect(database="template1", **kw)
# Enable autocommit so we can create databases
if psycopg2.__version__ >= '2.4.2':
db_connection.autocommit = True
else:
db_connection.set_isolation_level(psycopg2
.extensions
.ISOLATION_LEVEL_AUTOCOMMIT)
cursor = db_connection.cursor()
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except Exception, e:
module.fail_json(msg="unable to connect to database: %s" % e)
try:
if module.check_mode:
module.exit_json(changed=True,db=db)
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if state == "absent":
changed = db_delete(cursor, db)
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elif state == "present":
changed = db_create(cursor, db, owner, template, encoding)
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except Exception, e:
module.fail_json(msg="Database query failed: %s" % e)
module.exit_json(changed=changed, db=db)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()