544 lines
20 KiB
Python
544 lines
20 KiB
Python
#!/usr/bin/python
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#
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# Copyright (c) 2017 Ansible Project
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# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
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from __future__ import (absolute_import, division, print_function)
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__metaclass__ = type
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DOCUMENTATION = r'''
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---
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module: elasticache
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version_added: 1.0.0
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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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author: "Jim Dalton (@jsdalton)"
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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.
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- 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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type: str
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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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type: str
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engine:
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description:
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- Name of the cache engine to be used.
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- Supported values are C(redis) and C(memcached).
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default: memcached
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type: str
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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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type: str
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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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default: cache.t2.small
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type: str
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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 when I(state=present).
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type: int
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default: 1
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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
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connections.
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type: int
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cache_parameter_group:
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description:
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- The name of the cache parameter group to associate with this cache cluster. If this argument is omitted, the default cache parameter group
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for the specified engine will be used.
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aliases: [ 'parameter_group' ]
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type: str
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cache_subnet_group:
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description:
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- The subnet group name to associate with. Only use if inside a VPC.
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- Required if inside a VPC.
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type: str
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security_group_ids:
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description:
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- A list of VPC security group IDs to associate with this cache cluster. Only use if inside a VPC.
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type: list
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elements: str
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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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- Don't use if your Cache is inside a VPC. In that case use I(security_group_ids) instead!
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type: list
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elements: str
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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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type: str
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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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type: bool
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default: true
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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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- Defaults to C(false).
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type: bool
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extends_documentation_fragment:
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- amazon.aws.aws
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- amazon.aws.ec2
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'''
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EXAMPLES = r"""
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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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- name: Basic example
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community.aws.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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- name: Ensure cache cluster is gone
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community.aws.elasticache:
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name: "test-please-delete"
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state: absent
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- name: Reboot cache cluster
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community.aws.elasticache:
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name: "test-please-delete"
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state: rebooted
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"""
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from time import sleep
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try:
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import botocore
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except ImportError:
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pass # Handled by AnsibleAWSModule
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from ansible_collections.amazon.aws.plugins.module_utils.core import AnsibleAWSModule
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from ansible_collections.amazon.aws.plugins.module_utils.core import is_boto3_error_code
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from ansible_collections.amazon.aws.plugins.module_utils.ec2 import get_aws_connection_info
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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_parameter_group, cache_subnet_group,
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cache_security_groups, security_group_ids, zone, wait,
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hard_modify, region, **aws_connect_kwargs):
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self.module = module
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self.name = name
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self.engine = engine.lower()
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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_parameter_group = cache_parameter_group
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self.cache_subnet_group = cache_subnet_group
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self.cache_security_groups = cache_security_groups
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self.security_group_ids = security_group_ids
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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.region = region
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self.aws_connect_kwargs = aws_connect_kwargs
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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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kwargs = dict(CacheClusterId=self.name,
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NumCacheNodes=self.num_nodes,
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CacheNodeType=self.node_type,
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Engine=self.engine,
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EngineVersion=self.cache_engine_version,
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CacheSecurityGroupNames=self.cache_security_groups,
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SecurityGroupIds=self.security_group_ids,
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CacheParameterGroupName=self.cache_parameter_group,
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CacheSubnetGroupName=self.cache_subnet_group)
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if self.cache_port is not None:
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kwargs['Port'] = self.cache_port
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if self.zone is not None:
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kwargs['PreferredAvailabilityZone'] = self.zone
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try:
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self.conn.create_cache_cluster(**kwargs)
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except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
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self.module.fail_json_aws(e, msg="Failed to create cache cluster")
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self._refresh_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(CacheClusterId=self.name)
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except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
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self.module.fail_json_aws(e, msg="Failed to delete cache cluster")
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cache_cluster_data = response['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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self.conn.modify_cache_cluster(CacheClusterId=self.name,
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NumCacheNodes=self.num_nodes,
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CacheNodeIdsToRemove=nodes_to_remove,
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CacheSecurityGroupNames=self.cache_security_groups,
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CacheParameterGroupName=self.cache_parameter_group,
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SecurityGroupIds=self.security_group_ids,
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ApplyImmediately=True,
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EngineVersion=self.cache_engine_version)
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except botocore.exceptions.ClientError as e:
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self.module.fail_json_aws(e, msg="Failed to modify cache cluster")
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self._refresh_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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self.conn.reboot_cache_cluster(CacheClusterId=self.name,
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CacheNodeIdsToReboot=cache_node_ids)
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except botocore.exceptions.ClientError as e:
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self.module.fail_json_aws(e, msg="Failed to reboot cache cluster")
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self._refresh_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 self.status == awaited_status:
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# No need to wait, we're already done
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return
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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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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.items():
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if value is not None and value and self.data[key] != value:
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return True
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# Check cache 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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# check vpc security groups
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if self.security_group_ids:
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vpc_security_groups = []
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security_groups = self.data.get('SecurityGroups', [])
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for sg in security_groups:
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vpc_security_groups.append(sg['SecurityGroupId'])
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if set(vpc_security_groups) != set(self.security_group_ids):
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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.items():
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if getattr(self, key) is not None and 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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return self.module.client('elasticache')
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except (botocore.exceptions.ClientError, botocore.exceptions.BotoCoreError) as e:
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self.module.fail_json_aws(e, msg='Failed to connect to AWS')
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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(CacheClusterId=self.name, ShowCacheNodeInfo=True)
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except is_boto3_error_code('CacheClusterNotFound'):
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self.data = None
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self.status = 'gone'
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return
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except botocore.exceptions.ClientError as e: # pylint: disable=duplicate-except
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self.module.fail_json_aws(e, msg="Failed to describe cache clusters")
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cache_cluster_data = response['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 []
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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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""" elasticache ansible module """
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argument_spec = dict(
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state=dict(required=True, choices=['present', 'absent', 'rebooted']),
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name=dict(required=True),
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engine=dict(default='memcached'),
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cache_engine_version=dict(default=""),
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node_type=dict(default='cache.t2.small'),
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num_nodes=dict(default=1, type='int'),
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# alias for compat with the original PR 1950
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cache_parameter_group=dict(default="", aliases=['parameter_group']),
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cache_port=dict(type='int'),
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cache_subnet_group=dict(default=""),
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cache_security_groups=dict(default=[], type='list', elements='str'),
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security_group_ids=dict(default=[], type='list', elements='str'),
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zone=dict(),
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wait=dict(default=True, type='bool'),
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hard_modify=dict(type='bool'),
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)
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module = AnsibleAWSModule(
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argument_spec=argument_spec,
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)
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region, ec2_url, aws_connect_kwargs = get_aws_connection_info(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_subnet_group = module.params['cache_subnet_group']
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cache_security_groups = module.params['cache_security_groups']
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security_group_ids = module.params['security_group_ids']
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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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|
cache_parameter_group = module.params['cache_parameter_group']
|
|
|
|
if cache_subnet_group and cache_security_groups:
|
|
module.fail_json(msg="Can't specify both cache_subnet_group and cache_security_groups")
|
|
|
|
if state == 'present' and not num_nodes:
|
|
module.fail_json(msg="'num_nodes' is a required parameter. Please specify num_nodes > 0")
|
|
|
|
elasticache_manager = ElastiCacheManager(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)
|
|
|
|
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)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|