ansible/cloud/amazon/elasticache.py

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#!/usr/bin/python
# 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: elasticache
short_description: Manage cache clusters in Amazon Elasticache.
description:
- Manage cache clusters in Amazon Elasticache.
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- Returns information about the specified cache cluster.
version_added: "1.4"
author: "Jim Dalton (@jsdalton)"
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options:
state:
description:
- 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.
choices: ['present', 'absent', 'rebooted']
required: true
name:
description:
- The cache cluster identifier
required: true
engine:
description:
- Name of the cache engine to be used (memcached or redis)
required: false
default: memcached
cache_engine_version:
description:
- The version number of the cache engine
required: false
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default: none
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node_type:
description:
- The compute and memory capacity of the nodes in the cache cluster
required: false
default: cache.m1.small
num_nodes:
description:
- The initial number of cache nodes that the cache cluster will have. Required when state=present.
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required: false
cache_port:
description:
- The port number on which each of the cache nodes will accept connections
required: false
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default: none
cache_parameter_group:
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description:
- The name of the cache parameter group to associate with this cache cluster. If this argument is omitted, the default cache parameter group for the specified engine will be used.
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required: false
default: None
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version_added: "2.0"
aliases: [ 'parameter_group' ]
cache_subnet_group:
description:
- The subnet group name to associate with. Only use if inside a vpc. Required if inside a vpc
required: conditional
default: None
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version_added: "2.0"
security_group_ids:
description:
- A list of vpc security group names to associate with this cache cluster. Only use if inside a vpc
required: false
default: ['default']
version_added: "1.6"
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cache_security_groups:
description:
- A list of cache security group names to associate with this cache cluster. Must be an empty list if inside a vpc
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required: false
default: ['default']
zone:
description:
- The EC2 Availability Zone in which the cache cluster will be created
required: false
default: None
wait:
description:
- Wait for cache cluster result before returning
required: false
default: yes
choices: [ "yes", "no" ]
hard_modify:
description:
- Whether to destroy and recreate an existing cache cluster if necessary in order to modify its state
required: false
default: no
choices: [ "yes", "no" ]
extends_documentation_fragment:
- aws
- ec2
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"""
EXAMPLES = """
# Note: None of these examples set aws_access_key, aws_secret_key, or region.
# It is assumed that their matching environment variables are set.
# Basic example
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- elasticache:
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name: "test-please-delete"
state: present
engine: memcached
cache_engine_version: 1.4.14
node_type: cache.m1.small
num_nodes: 1
cache_port: 11211
cache_security_groups:
- default
zone: us-east-1d
# Ensure cache cluster is gone
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- elasticache:
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name: "test-please-delete"
state: absent
# Reboot cache cluster
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- elasticache:
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name: "test-please-delete"
state: rebooted
"""
import sys
import time
try:
import boto
from boto.elasticache.layer1 import ElastiCacheConnection
from boto.regioninfo import RegionInfo
HAS_BOTO = True
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except ImportError:
HAS_BOTO = False
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class ElastiCacheManager(object):
"""Handles elasticache creation and destruction"""
EXIST_STATUSES = ['available', 'creating', 'rebooting', 'modifying']
def __init__(self, module, name, engine, cache_engine_version, node_type,
num_nodes, cache_port, cache_parameter_group, cache_subnet_group,
cache_security_groups, security_group_ids, zone, wait,
hard_modify, region, **aws_connect_kwargs):
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self.module = module
self.name = name
self.engine = engine
self.cache_engine_version = cache_engine_version
self.node_type = node_type
self.num_nodes = num_nodes
self.cache_port = cache_port
self.cache_parameter_group = cache_parameter_group
self.cache_subnet_group = cache_subnet_group
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self.cache_security_groups = cache_security_groups
self.security_group_ids = security_group_ids
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self.zone = zone
self.wait = wait
self.hard_modify = hard_modify
self.region = region
self.aws_connect_kwargs = aws_connect_kwargs
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self.changed = False
self.data = None
self.status = 'gone'
self.conn = self._get_elasticache_connection()
self._refresh_data()
def ensure_present(self):
"""Ensure cache cluster exists or create it if not"""
if self.exists():
self.sync()
else:
self.create()
def ensure_absent(self):
"""Ensure cache cluster is gone or delete it if not"""
self.delete()
def ensure_rebooted(self):
"""Ensure cache cluster is gone or delete it if not"""
self.reboot()
def exists(self):
"""Check if cache cluster exists"""
return self.status in self.EXIST_STATUSES
def create(self):
"""Create an ElastiCache cluster"""
if self.status == 'available':
return
if self.status in ['creating', 'rebooting', 'modifying']:
if self.wait:
self._wait_for_status('available')
return
if self.status == 'deleting':
if self.wait:
self._wait_for_status('gone')
else:
msg = "'%s' is currently deleting. Cannot create."
self.module.fail_json(msg=msg % self.name)
try:
response = self.conn.create_cache_cluster(cache_cluster_id=self.name,
num_cache_nodes=self.num_nodes,
cache_node_type=self.node_type,
engine=self.engine,
engine_version=self.cache_engine_version,
cache_security_group_names=self.cache_security_groups,
security_group_ids=self.security_group_ids,
cache_parameter_group_name=self.cache_parameter_group,
cache_subnet_group_name=self.cache_subnet_group,
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preferred_availability_zone=self.zone,
port=self.cache_port)
except boto.exception.BotoServerError, e:
self.module.fail_json(msg=e.message)
cache_cluster_data = response['CreateCacheClusterResponse']['CreateCacheClusterResult']['CacheCluster']
self._refresh_data(cache_cluster_data)
self.changed = True
if self.wait:
self._wait_for_status('available')
return True
def delete(self):
"""Destroy an ElastiCache cluster"""
if self.status == 'gone':
return
if self.status == 'deleting':
if self.wait:
self._wait_for_status('gone')
return
if self.status in ['creating', 'rebooting', 'modifying']:
if self.wait:
self._wait_for_status('available')
else:
msg = "'%s' is currently %s. Cannot delete."
self.module.fail_json(msg=msg % (self.name, self.status))
try:
response = self.conn.delete_cache_cluster(cache_cluster_id=self.name)
except boto.exception.BotoServerError, e:
self.module.fail_json(msg=e.message)
cache_cluster_data = response['DeleteCacheClusterResponse']['DeleteCacheClusterResult']['CacheCluster']
self._refresh_data(cache_cluster_data)
self.changed = True
if self.wait:
self._wait_for_status('gone')
def sync(self):
"""Sync settings to cluster if required"""
if not self.exists():
msg = "'%s' is %s. Cannot sync."
self.module.fail_json(msg=msg % (self.name, self.status))
if self.status in ['creating', 'rebooting', 'modifying']:
if self.wait:
self._wait_for_status('available')
else:
# Cluster can only be synced if available. If we can't wait
# for this, then just be done.
return
if self._requires_destroy_and_create():
if not self.hard_modify:
msg = "'%s' requires destructive modification. 'hard_modify' must be set to true to proceed."
self.module.fail_json(msg=msg % self.name)
if not self.wait:
msg = "'%s' requires destructive modification. 'wait' must be set to true."
self.module.fail_json(msg=msg % self.name)
self.delete()
self.create()
return
if self._requires_modification():
self.modify()
def modify(self):
"""Modify the cache cluster. Note it's only possible to modify a few select options."""
nodes_to_remove = self._get_nodes_to_remove()
try:
response = self.conn.modify_cache_cluster(cache_cluster_id=self.name,
num_cache_nodes=self.num_nodes,
cache_node_ids_to_remove=nodes_to_remove,
cache_security_group_names=self.cache_security_groups,
cache_parameter_group_name=self.cache_parameter_group,
security_group_ids=self.security_group_ids,
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apply_immediately=True,
engine_version=self.cache_engine_version)
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except boto.exception.BotoServerError, e:
self.module.fail_json(msg=e.message)
cache_cluster_data = response['ModifyCacheClusterResponse']['ModifyCacheClusterResult']['CacheCluster']
self._refresh_data(cache_cluster_data)
self.changed = True
if self.wait:
self._wait_for_status('available')
def reboot(self):
"""Reboot the cache cluster"""
if not self.exists():
msg = "'%s' is %s. Cannot reboot."
self.module.fail_json(msg=msg % (self.name, self.status))
if self.status == 'rebooting':
return
if self.status in ['creating', 'modifying']:
if self.wait:
self._wait_for_status('available')
else:
msg = "'%s' is currently %s. Cannot reboot."
self.module.fail_json(msg=msg % (self.name, self.status))
# Collect ALL nodes for reboot
cache_node_ids = [cn['CacheNodeId'] for cn in self.data['CacheNodes']]
try:
response = self.conn.reboot_cache_cluster(cache_cluster_id=self.name,
cache_node_ids_to_reboot=cache_node_ids)
except boto.exception.BotoServerError, e:
self.module.fail_json(msg=e.message)
cache_cluster_data = response['RebootCacheClusterResponse']['RebootCacheClusterResult']['CacheCluster']
self._refresh_data(cache_cluster_data)
self.changed = True
if self.wait:
self._wait_for_status('available')
def get_info(self):
"""Return basic info about the cache cluster"""
info = {
'name': self.name,
'status': self.status
}
if self.data:
info['data'] = self.data
return info
def _wait_for_status(self, awaited_status):
"""Wait for status to change from present status to awaited_status"""
status_map = {
'creating': 'available',
'rebooting': 'available',
'modifying': 'available',
'deleting': 'gone'
}
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if self.status == awaited_status:
# No need to wait, we're already done
return
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if status_map[self.status] != awaited_status:
msg = "Invalid awaited status. '%s' cannot transition to '%s'"
self.module.fail_json(msg=msg % (self.status, awaited_status))
if awaited_status not in set(status_map.values()):
msg = "'%s' is not a valid awaited status."
self.module.fail_json(msg=msg % awaited_status)
while True:
time.sleep(1)
self._refresh_data()
if self.status == awaited_status:
break
def _requires_modification(self):
"""Check if cluster requires (nondestructive) modification"""
# Check modifiable data attributes
modifiable_data = {
'NumCacheNodes': self.num_nodes,
'EngineVersion': self.cache_engine_version
}
for key, value in modifiable_data.iteritems():
if self.data[key] != value:
return True
# Check cache security groups
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cache_security_groups = []
for sg in self.data['CacheSecurityGroups']:
cache_security_groups.append(sg['CacheSecurityGroupName'])
if set(cache_security_groups) - set(self.cache_security_groups):
return True
# check vpc security groups
vpc_security_groups = []
security_groups = self.data['SecurityGroups'] or []
for sg in security_groups:
vpc_security_groups.append(sg['SecurityGroupId'])
if set(vpc_security_groups) - set(self.security_group_ids):
return True
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return False
def _requires_destroy_and_create(self):
"""
Check whether a destroy and create is required to synchronize cluster.
"""
unmodifiable_data = {
'node_type': self.data['CacheNodeType'],
'engine': self.data['Engine'],
'cache_port': self._get_port()
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}
# Only check for modifications if zone is specified
if self.zone is not None:
unmodifiable_data['zone'] = self.data['PreferredAvailabilityZone']
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for key, value in unmodifiable_data.iteritems():
if getattr(self, key) != value:
return True
return False
def _get_elasticache_connection(self):
"""Get an elasticache connection"""
try:
endpoint = "elasticache.%s.amazonaws.com" % self.region
connect_region = RegionInfo(name=self.region, endpoint=endpoint)
return ElastiCacheConnection(
region=connect_region,
**self.aws_connect_kwargs
)
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except boto.exception.NoAuthHandlerFound, e:
self.module.fail_json(msg=e.message)
def _get_port(self):
"""Get the port. Where this information is retrieved from is engine dependent."""
if self.data['Engine'] == 'memcached':
return self.data['ConfigurationEndpoint']['Port']
elif self.data['Engine'] == 'redis':
# Redis only supports a single node (presently) so just use
# the first and only
return self.data['CacheNodes'][0]['Endpoint']['Port']
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def _refresh_data(self, cache_cluster_data=None):
"""Refresh data about this cache cluster"""
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if cache_cluster_data is None:
try:
response = self.conn.describe_cache_clusters(cache_cluster_id=self.name,
show_cache_node_info=True)
except boto.exception.BotoServerError:
self.data = None
self.status = 'gone'
return
cache_cluster_data = response['DescribeCacheClustersResponse']['DescribeCacheClustersResult']['CacheClusters'][0]
self.data = cache_cluster_data
self.status = self.data['CacheClusterStatus']
# The documentation for elasticache lies -- status on rebooting is set
# to 'rebooting cache cluster nodes' instead of 'rebooting'. Fix it
# here to make status checks etc. more sane.
if self.status == 'rebooting cache cluster nodes':
self.status = 'rebooting'
def _get_nodes_to_remove(self):
"""If there are nodes to remove, it figures out which need to be removed"""
num_nodes_to_remove = self.data['NumCacheNodes'] - self.num_nodes
if num_nodes_to_remove <= 0:
return None
if not self.hard_modify:
msg = "'%s' requires removal of cache nodes. 'hard_modify' must be set to true to proceed."
self.module.fail_json(msg=msg % self.name)
cache_node_ids = [cn['CacheNodeId'] for cn in self.data['CacheNodes']]
return cache_node_ids[-num_nodes_to_remove:]
def main():
argument_spec = ec2_argument_spec()
default = object()
argument_spec.update(dict(
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state={'required': True, 'choices': ['present', 'absent', 'rebooted']},
name={'required': True},
engine={'required': False, 'default': 'memcached'},
cache_engine_version={'required': False},
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node_type={'required': False, 'default': 'cache.m1.small'},
num_nodes={'required': False, 'default': None, 'type': 'int'},
# alias for compat with the original PR 1950
cache_parameter_group={'required': False, 'default': None, 'aliases': ['parameter_group']},
cache_port={'required': False, 'type': 'int'},
cache_subnet_group={'required': False, 'default': None},
cache_security_groups={'required': False, 'default': [default],
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'type': 'list'},
security_group_ids={'required': False, 'default': [],
'type': 'list'},
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zone={'required': False, 'default': None},
wait={'required': False, 'type' : 'bool', 'default': True},
hard_modify={'required': False, 'type': 'bool', 'default': False}
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)
)
module = AnsibleModule(
argument_spec=argument_spec,
)
if not HAS_BOTO:
module.fail_json(msg='boto required for this module')
region, ec2_url, aws_connect_kwargs = get_aws_connection_info(module)
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name = module.params['name']
state = module.params['state']
engine = module.params['engine']
cache_engine_version = module.params['cache_engine_version']
node_type = module.params['node_type']
num_nodes = module.params['num_nodes']
cache_port = module.params['cache_port']
cache_subnet_group = module.params['cache_subnet_group']
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cache_security_groups = module.params['cache_security_groups']
security_group_ids = module.params['security_group_ids']
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zone = module.params['zone']
wait = module.params['wait']
hard_modify = module.params['hard_modify']
cache_parameter_group = module.params['cache_parameter_group']
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if cache_subnet_group and cache_security_groups == [default]:
cache_security_groups = []
if cache_subnet_group and cache_security_groups:
module.fail_json(msg="Can't specify both cache_subnet_group and cache_security_groups")
if cache_security_groups == [default]:
cache_security_groups = ['default']
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if state == 'present' and not num_nodes:
module.fail_json(msg="'num_nodes' is a required parameter. Please specify num_nodes > 0")
if not region:
module.fail_json(msg=str("Either region or AWS_REGION or EC2_REGION environment variable or boto config aws_region or ec2_region must be set."))
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elasticache_manager = ElastiCacheManager(module, name, engine,
cache_engine_version, node_type,
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num_nodes, cache_port,
cache_parameter_group,
cache_subnet_group,
cache_security_groups,
security_group_ids, zone, wait,
hard_modify, region, **aws_connect_kwargs)
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if state == 'present':
elasticache_manager.ensure_present()
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 *
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main()