Add mongodb parameter module (#1596)

* Add mongodb parameter module

This module permit to configure mongodb live parameters to tune the running engine

database/misc/mongodb_parameter.py

@@ -0,0 +1,228 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+"""
+(c) 2016, Loic Blot <loic.blot@unix-experience.fr>
+Sponsored by Infopro Digital. http://www.infopro-digital.com/
+Sponsored by E.T.A.I. http://www.etai.fr/
+
+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: mongodb_parameter
+short_description: Change an administrative parameter on a MongoDB server.
+description:
+    - Change an administrative parameter on a MongoDB server.
+version_added: "2.1"
+options:
+    login_user:
+        description:
+            - The username used to authenticate with
+        required: false
+        default: null
+    login_password:
+        description:
+            - The password used to authenticate with
+        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: 27017
+    login_database:
+        description:
+            - The database where login credentials are stored
+        required: false
+        default: null
+    replica_set:
+        description:
+            - Replica set to connect to (automatically connects to primary for writes)
+        required: false
+        default: null
+    database:
+        description:
+            - The name of the database to add/remove the user from
+        required: true
+    ssl:
+        description:
+            - Whether to use an SSL connection when connecting to the database
+        required: false
+        default: false
+    param:
+        description:
+            - MongoDB administrative parameter to modify
+        required: true
+    value:
+        description:
+            - MongoDB administrative parameter value to set
+        required: true
+    param_type:
+        description:
+            - Define the parameter value (str, int)
+        required: false
+        default: str
+
+notes:
+    - Requires the pymongo Python package on the remote host, version 2.4.2+. This
+      can be installed using pip or the OS package manager. @see http://api.mongodb.org/python/current/installation.html
+requirements: [ "pymongo" ]
+author: "Loic Blot (@nerzhul)"
+'''
+
+EXAMPLES = '''
+# Set MongoDB syncdelay to 60 (this is an int)
+- mongodb_parameter: param="syncdelay" value=60 param_type="int"
+'''
+
+RETURN = '''
+before:
+    description: value before modification
+    returned: success
+    type: string
+after:
+    description: value after modification
+    returned: success
+    type: string
+'''
+
+import ConfigParser
+
+try:
+    from pymongo.errors import ConnectionFailure
+    from pymongo.errors import OperationFailure
+    from pymongo import version as PyMongoVersion
+    from pymongo import MongoClient
+except ImportError:
+    try:  # for older PyMongo 2.2
+        from pymongo import Connection as MongoClient
+    except ImportError:
+        pymongo_found = False
+    else:
+        pymongo_found = True
+else:
+    pymongo_found = True
+
+
+# =========================================
+# MongoDB module specific support methods.
+#
+
+def load_mongocnf():
+    config = ConfigParser.RawConfigParser()
+    mongocnf = os.path.expanduser('~/.mongodb.cnf')
+
+    try:
+        config.readfp(open(mongocnf))
+        creds = dict(
+            user=config.get('client', 'user'),
+            password=config.get('client', 'pass')
+        )
+    except (ConfigParser.NoOptionError, IOError):
+        return False
+
+    return creds
+
+
+# =========================================
+# Module execution.
+#
+
+def main():
+    module = AnsibleModule(
+        argument_spec=dict(
+            login_user=dict(default=None),
+            login_password=dict(default=None, no_log=True),
+            login_host=dict(default='localhost'),
+            login_port=dict(default=27017, type='int'),
+            login_database=dict(default=None),
+            replica_set=dict(default=None),
+            param=dict(default=None, required=True),
+            value=dict(default=None, required=True),
+            param_type=dict(default="str", choices=['str', 'int']),
+            ssl=dict(default=False, type='bool'),
+        )
+    )
+
+    if not pymongo_found:
+        module.fail_json(msg='the python pymongo module is required')
+
+    login_user = module.params['login_user']
+    login_password = module.params['login_password']
+    login_host = module.params['login_host']
+    login_port = module.params['login_port']
+    login_database = module.params['login_database']
+
+    replica_set = module.params['replica_set']
+    ssl = module.params['ssl']
+
+    param = module.params['param']
+    param_type = module.params['param_type']
+    value = module.params['value']
+
+    # Verify parameter is coherent with specified type
+    try:
+        if param_type == 'int':
+            value = int(value)
+    except ValueError, e:
+        module.fail_json(msg="value '%s' is not %s" % (value, param_type))
+
+    try:
+        if replica_set:
+            client = MongoClient(login_host, int(login_port), replicaset=replica_set, ssl=ssl)
+        else:
+            client = MongoClient(login_host, int(login_port), ssl=ssl)
+
+        if login_user is None and login_password is None:
+            mongocnf_creds = load_mongocnf()
+            if mongocnf_creds is not False:
+                login_user = mongocnf_creds['user']
+                login_password = mongocnf_creds['password']
+        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')
+
+        if login_user is not None and login_password is not None:
+            client.admin.authenticate(login_user, login_password, source=login_database)
+
+    except ConnectionFailure, e:
+        module.fail_json(msg='unable to connect to database: %s' % str(e))
+
+    db = client.admin
+
+    try:
+        after_value = db.command("setParameter", **{param: int(value)})
+    except OperationFailure, e:
+        module.fail_json(msg="unable to change parameter: %s" % str(e))
+
+    if "was" not in after_value:
+        module.exit_json(changed=True, msg="Unable to determine old value, assume it changed.")
+    else:
+        module.exit_json(changed=(value != after_value["was"]), before=after_value["was"],
+                         after=value)
+
+
+# import module snippets
+from ansible.module_utils.basic import *
+
+if __name__ ==  '__main__':
+     main()