525 lines
19 KiB
Python
525 lines
19 KiB
Python
#!/usr/bin/python
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# This file is part of Ansible
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#
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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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#
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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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#
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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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DOCUMENTATION = """
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---
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module: elasticache
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short_description: Manage cache clusters in Amazon Elasticache.
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description:
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- Manage cache clusters in Amazon Elasticache.
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- Returns information about the specified cache cluster.
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version_added: "1.4"
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requirements: [ "boto" ]
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author: Jim Dalton
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options:
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state:
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description:
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- C(absent) or C(present) are idempotent actions that will create or destroy a cache cluster as needed. C(rebooted) will reboot the cluster, resulting in a momentary outage.
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choices: ['present', 'absent', 'rebooted']
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required: true
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name:
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description:
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- The cache cluster identifier
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required: true
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engine:
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description:
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- Name of the cache engine to be used (memcached or redis)
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required: false
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default: memcached
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cache_engine_version:
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description:
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- The version number of the cache engine
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required: false
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default: 1.4.14
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node_type:
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description:
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- The compute and memory capacity of the nodes in the cache cluster
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required: false
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default: cache.m1.small
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num_nodes:
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description:
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- The initial number of cache nodes that the cache cluster will have
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required: false
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cache_port:
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description:
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- The port number on which each of the cache nodes will accept connections
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required: false
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default: 11211
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cache_security_groups:
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description:
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- A list of cache security group names to associate with this cache cluster
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required: false
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default: ['default']
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zone:
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description:
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- The EC2 Availability Zone in which the cache cluster will be created
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required: false
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default: None
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wait:
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description:
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- Wait for cache cluster result before returning
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required: false
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default: yes
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choices: [ "yes", "no" ]
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hard_modify:
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description:
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- Whether to destroy and recreate an existing cache cluster if necessary in order to modify its state
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required: false
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default: no
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choices: [ "yes", "no" ]
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aws_secret_key:
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description:
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- AWS secret key. If not set then the value of the AWS_SECRET_KEY environment variable is used.
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required: false
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default: None
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aliases: ['ec2_secret_key', 'secret_key']
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aws_access_key:
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description:
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- AWS access key. If not set then the value of the AWS_ACCESS_KEY environment variable is used.
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required: false
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default: None
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aliases: ['ec2_access_key', 'access_key']
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region:
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description:
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- The AWS region to use. If not specified then the value of the EC2_REGION environment variable, if any, is used.
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required: false
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aliases: ['aws_region', 'ec2_region']
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"""
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EXAMPLES = """
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# Note: None of these examples set aws_access_key, aws_secret_key, or region.
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# It is assumed that their matching environment variables are set.
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# Basic example
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- local_action:
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module: elasticache
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name: "test-please-delete"
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state: present
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engine: memcached
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cache_engine_version: 1.4.14
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node_type: cache.m1.small
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num_nodes: 1
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cache_port: 11211
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cache_security_groups:
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- default
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zone: us-east-1d
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# Ensure cache cluster is gone
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- local_action:
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module: elasticache
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name: "test-please-delete"
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state: absent
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# Reboot cache cluster
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- local_action:
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module: elasticache
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name: "test-please-delete"
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state: rebooted
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"""
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import sys
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import os
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import time
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try:
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import boto
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from boto.elasticache.layer1 import ElastiCacheConnection
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from boto.regioninfo import RegionInfo
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except ImportError:
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print "failed=True msg='boto required for this module'"
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sys.exit(1)
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class ElastiCacheManager(object):
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"""Handles elasticache creation and destruction"""
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EXIST_STATUSES = ['available', 'creating', 'rebooting', 'modifying']
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def __init__(self, module, name, engine, cache_engine_version, node_type,
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num_nodes, cache_port, cache_security_groups, zone, wait,
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hard_modify, aws_access_key, aws_secret_key, region):
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self.module = module
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self.name = name
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self.engine = engine
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self.cache_engine_version = cache_engine_version
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self.node_type = node_type
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self.num_nodes = num_nodes
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self.cache_port = cache_port
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self.cache_security_groups = cache_security_groups
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self.zone = zone
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self.wait = wait
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self.hard_modify = hard_modify
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self.aws_access_key = aws_access_key
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self.aws_secret_key = aws_secret_key
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self.region = region
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self.changed = False
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self.data = None
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self.status = 'gone'
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self.conn = self._get_elasticache_connection()
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self._refresh_data()
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def ensure_present(self):
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"""Ensure cache cluster exists or create it if not"""
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if self.exists():
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self.sync()
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else:
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self.create()
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def ensure_absent(self):
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"""Ensure cache cluster is gone or delete it if not"""
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self.delete()
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def ensure_rebooted(self):
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"""Ensure cache cluster is gone or delete it if not"""
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self.reboot()
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def exists(self):
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"""Check if cache cluster exists"""
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return self.status in self.EXIST_STATUSES
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def create(self):
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"""Create an ElastiCache cluster"""
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if self.status == 'available':
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return
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if self.status in ['creating', 'rebooting', 'modifying']:
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if self.wait:
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self._wait_for_status('available')
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return
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if self.status == 'deleting':
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if self.wait:
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self._wait_for_status('gone')
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else:
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msg = "'%s' is currently deleting. Cannot create."
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self.module.fail_json(msg=msg % self.name)
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try:
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response = self.conn.create_cache_cluster(cache_cluster_id=self.name,
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num_cache_nodes=self.num_nodes,
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cache_node_type=self.node_type,
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engine=self.engine,
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engine_version=self.cache_engine_version,
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cache_security_group_names=self.cache_security_groups,
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preferred_availability_zone=self.zone,
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port=self.cache_port)
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except boto.exception.BotoServerError, e:
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self.module.fail_json(msg=e.message)
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cache_cluster_data = response['CreateCacheClusterResponse']['CreateCacheClusterResult']['CacheCluster']
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self._refresh_data(cache_cluster_data)
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self.changed = True
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if self.wait:
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self._wait_for_status('available')
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return True
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def delete(self):
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"""Destroy an ElastiCache cluster"""
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if self.status == 'gone':
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return
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if self.status == 'deleting':
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if self.wait:
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self._wait_for_status('gone')
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return
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if self.status in ['creating', 'rebooting', 'modifying']:
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if self.wait:
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self._wait_for_status('available')
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else:
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msg = "'%s' is currently %s. Cannot delete."
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self.module.fail_json(msg=msg % (self.name, self.status))
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try:
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response = self.conn.delete_cache_cluster(cache_cluster_id=self.name)
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except boto.exception.BotoServerError, e:
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self.module.fail_json(msg=e.message)
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cache_cluster_data = response['DeleteCacheClusterResponse']['DeleteCacheClusterResult']['CacheCluster']
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self._refresh_data(cache_cluster_data)
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self.changed = True
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if self.wait:
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self._wait_for_status('gone')
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def sync(self):
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"""Sync settings to cluster if required"""
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if not self.exists():
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msg = "'%s' is %s. Cannot sync."
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self.module.fail_json(msg=msg % (self.name, self.status))
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if self.status in ['creating', 'rebooting', 'modifying']:
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if self.wait:
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self._wait_for_status('available')
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else:
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# Cluster can only be synced if available. If we can't wait
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# for this, then just be done.
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return
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if self._requires_destroy_and_create():
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if not self.hard_modify:
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msg = "'%s' requires destructive modification. 'hard_modify' must be set to true to proceed."
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self.module.fail_json(msg=msg % self.name)
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if not self.wait:
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msg = "'%s' requires destructive modification. 'wait' must be set to true."
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self.module.fail_json(msg=msg % self.name)
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self.delete()
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self.create()
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return
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if self._requires_modification():
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self.modify()
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def modify(self):
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"""Modify the cache cluster. Note it's only possible to modify a few select options."""
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nodes_to_remove = self._get_nodes_to_remove()
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try:
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response = self.conn.modify_cache_cluster(cache_cluster_id=self.name,
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num_cache_nodes=self.num_nodes,
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cache_node_ids_to_remove=nodes_to_remove,
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cache_security_group_names=self.cache_security_groups,
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apply_immediately=True,
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engine_version=self.cache_engine_version)
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except boto.exception.BotoServerError, e:
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self.module.fail_json(msg=e.message)
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cache_cluster_data = response['ModifyCacheClusterResponse']['ModifyCacheClusterResult']['CacheCluster']
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self._refresh_data(cache_cluster_data)
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self.changed = True
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if self.wait:
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self._wait_for_status('available')
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def reboot(self):
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"""Reboot the cache cluster"""
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if not self.exists():
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msg = "'%s' is %s. Cannot reboot."
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self.module.fail_json(msg=msg % (self.name, self.status))
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if self.status == 'rebooting':
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return
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if self.status in ['creating', 'modifying']:
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if self.wait:
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self._wait_for_status('available')
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else:
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msg = "'%s' is currently %s. Cannot reboot."
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self.module.fail_json(msg=msg % (self.name, self.status))
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# Collect ALL nodes for reboot
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cache_node_ids = [cn['CacheNodeId'] for cn in self.data['CacheNodes']]
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try:
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response = self.conn.reboot_cache_cluster(cache_cluster_id=self.name,
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cache_node_ids_to_reboot=cache_node_ids)
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except boto.exception.BotoServerError, e:
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self.module.fail_json(msg=e.message)
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cache_cluster_data = response['RebootCacheClusterResponse']['RebootCacheClusterResult']['CacheCluster']
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self._refresh_data(cache_cluster_data)
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self.changed = True
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if self.wait:
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self._wait_for_status('available')
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def get_info(self):
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"""Return basic info about the cache cluster"""
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info = {
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'name': self.name,
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'status': self.status
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}
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if self.data:
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info['data'] = self.data
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return info
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def _wait_for_status(self, awaited_status):
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"""Wait for status to change from present status to awaited_status"""
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status_map = {
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'creating': 'available',
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'rebooting': 'available',
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'modifying': 'available',
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'deleting': 'gone'
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}
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if status_map[self.status] != awaited_status:
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msg = "Invalid awaited status. '%s' cannot transition to '%s'"
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self.module.fail_json(msg=msg % (self.status, awaited_status))
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if awaited_status not in set(status_map.values()):
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msg = "'%s' is not a valid awaited status."
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self.module.fail_json(msg=msg % awaited_status)
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while True:
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time.sleep(1)
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self._refresh_data()
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if self.status == awaited_status:
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break
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def _requires_modification(self):
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"""Check if cluster requires (nondestructive) modification"""
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# Check modifiable data attributes
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modifiable_data = {
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'NumCacheNodes': self.num_nodes,
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'EngineVersion': self.cache_engine_version
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}
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for key, value in modifiable_data.iteritems():
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if self.data[key] != value:
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return True
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# Check security groups
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cache_security_groups = []
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for sg in self.data['CacheSecurityGroups']:
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cache_security_groups.append(sg['CacheSecurityGroupName'])
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if set(cache_security_groups) - set(self.cache_security_groups):
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return True
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return False
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def _requires_destroy_and_create(self):
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"""
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Check whether a destroy and create is required to synchronize cluster.
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"""
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unmodifiable_data = {
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'node_type': self.data['CacheNodeType'],
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'engine': self.data['Engine'],
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'cache_port': self._get_port()
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}
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# Only check for modifications if zone is specified
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if self.zone is not None:
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unmodifiable_data['zone'] = self.data['PreferredAvailabilityZone']
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for key, value in unmodifiable_data.iteritems():
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if getattr(self, key) != value:
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return True
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return False
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def _get_elasticache_connection(self):
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"""Get an elasticache connection"""
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try:
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endpoint = "elasticache.%s.amazonaws.com" % self.region
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connect_region = RegionInfo(name=self.region, endpoint=endpoint)
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return ElastiCacheConnection(aws_access_key_id=self.aws_access_key,
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aws_secret_access_key=self.aws_secret_key,
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region=connect_region)
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except boto.exception.NoAuthHandlerFound, e:
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self.module.fail_json(msg=e.message)
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def _get_port(self):
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"""Get the port. Where this information is retrieved from is engine dependent."""
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if self.data['Engine'] == 'memcached':
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return self.data['ConfigurationEndpoint']['Port']
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elif self.data['Engine'] == 'redis':
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# Redis only supports a single node (presently) so just use
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# the first and only
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return self.data['CacheNodes'][0]['Endpoint']['Port']
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def _refresh_data(self, cache_cluster_data=None):
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"""Refresh data about this cache cluster"""
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if cache_cluster_data is None:
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try:
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response = self.conn.describe_cache_clusters(cache_cluster_id=self.name,
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show_cache_node_info=True)
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except boto.exception.BotoServerError:
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self.data = None
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self.status = 'gone'
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return
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cache_cluster_data = response['DescribeCacheClustersResponse']['DescribeCacheClustersResult']['CacheClusters'][0]
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self.data = cache_cluster_data
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self.status = self.data['CacheClusterStatus']
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# The documentation for elasticache lies -- status on rebooting is set
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# to 'rebooting cache cluster nodes' instead of 'rebooting'. Fix it
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# here to make status checks etc. more sane.
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if self.status == 'rebooting cache cluster nodes':
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self.status = 'rebooting'
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def _get_nodes_to_remove(self):
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"""If there are nodes to remove, it figures out which need to be removed"""
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num_nodes_to_remove = self.data['NumCacheNodes'] - self.num_nodes
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if num_nodes_to_remove <= 0:
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return None
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if not self.hard_modify:
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msg = "'%s' requires removal of cache nodes. 'hard_modify' must be set to true to proceed."
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self.module.fail_json(msg=msg % self.name)
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cache_node_ids = [cn['CacheNodeId'] for cn in self.data['CacheNodes']]
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return cache_node_ids[-num_nodes_to_remove:]
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def main():
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argument_spec = ec2_argument_spec()
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argument_spec.update(dict(
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state={'required': True, 'choices': ['present', 'absent', 'rebooted']},
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name={'required': True},
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engine={'required': False, 'default': 'memcached'},
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cache_engine_version={'required': False, 'default': '1.4.14'},
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node_type={'required': False, 'default': 'cache.m1.small'},
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num_nodes={'required': False, 'default': None, 'type': 'int'},
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cache_port={'required': False, 'default': 11211, 'type': 'int'},
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cache_security_groups={'required': False, 'default': ['default'],
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'type': 'list'},
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zone={'required': False, 'default': None},
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wait={'required': False, 'choices': BOOLEANS, 'default': True},
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hard_modify={'required': False, 'choices': BOOLEANS, 'default': False}
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)
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)
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module = AnsibleModule(
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argument_spec=argument_spec,
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)
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ec2_url, aws_access_key, aws_secret_key, region = get_ec2_creds(module)
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name = module.params['name']
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state = module.params['state']
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engine = module.params['engine']
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cache_engine_version = module.params['cache_engine_version']
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node_type = module.params['node_type']
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num_nodes = module.params['num_nodes']
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cache_port = module.params['cache_port']
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cache_security_groups = module.params['cache_security_groups']
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zone = module.params['zone']
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wait = module.params['wait']
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hard_modify = module.params['hard_modify']
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if state == 'present' and not num_nodes:
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module.fail_json(msg="'num_nodes' is a required parameter. Please specify num_nodes > 0")
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if not region:
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module.fail_json(msg=str("Either region or EC2_REGION environment variable must be set."))
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elasticache_manager = ElastiCacheManager(module, name, engine,
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cache_engine_version, node_type,
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num_nodes, cache_port,
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cache_security_groups, zone, wait,
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hard_modify, aws_access_key,
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aws_secret_key, region)
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if state == 'present':
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elasticache_manager.ensure_present()
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elif state == 'absent':
|
|
elasticache_manager.ensure_absent()
|
|
elif state == 'rebooted':
|
|
elasticache_manager.ensure_rebooted()
|
|
|
|
facts_result = dict(changed=elasticache_manager.changed,
|
|
elasticache=elasticache_manager.get_info())
|
|
|
|
module.exit_json(**facts_result)
|
|
|
|
# import module snippets
|
|
from ansible.module_utils.basic import *
|
|
from ansible.module_utils.ec2 import *
|
|
|
|
main()
|