#!/usr/bin/env python ''' EC2 external inventory script ================================= Generates inventory that Ansible can understand by making API request to AWS EC2 using the Boto library. NOTE: This script assumes Ansible is being executed where the environment variables needed for Boto have already been set: export AWS_ACCESS_KEY_ID='AK123' export AWS_SECRET_ACCESS_KEY='abc123' This script also assumes there is an ec2.ini file alongside it. To specify a different path to ec2.ini, define the EC2_INI_PATH environment variable: export EC2_INI_PATH=/path/to/my_ec2.ini If you're using eucalyptus you need to set the above variables and you need to define: export EC2_URL=http://hostname_of_your_cc:port/services/Eucalyptus For more details, see: http://docs.pythonboto.org/en/latest/boto_config_tut.html When run against a specific host, this script returns the following variables: - ec2_ami_launch_index - ec2_architecture - ec2_association - ec2_attachTime - ec2_attachment - ec2_attachmentId - ec2_client_token - ec2_deleteOnTermination - ec2_description - ec2_deviceIndex - ec2_dns_name - ec2_eventsSet - ec2_group_name - ec2_hypervisor - ec2_id - ec2_image_id - ec2_instanceState - ec2_instance_type - ec2_ipOwnerId - ec2_ip_address - ec2_item - ec2_kernel - ec2_key_name - ec2_launch_time - ec2_monitored - ec2_monitoring - ec2_networkInterfaceId - ec2_ownerId - ec2_persistent - ec2_placement - ec2_platform - ec2_previous_state - ec2_private_dns_name - ec2_private_ip_address - ec2_publicIp - ec2_public_dns_name - ec2_ramdisk - ec2_reason - ec2_region - ec2_requester_id - ec2_root_device_name - ec2_root_device_type - ec2_security_group_ids - ec2_security_group_names - ec2_shutdown_state - ec2_sourceDestCheck - ec2_spot_instance_request_id - ec2_state - ec2_state_code - ec2_state_reason - ec2_status - ec2_subnet_id - ec2_tenancy - ec2_virtualization_type - ec2_vpc_id These variables are pulled out of a boto.ec2.instance object. There is a lack of consistency with variable spellings (camelCase and underscores) since this just loops through all variables the object exposes. It is preferred to use the ones with underscores when multiple exist. In addition, if an instance has AWS Tags associated with it, each tag is a new variable named: - ec2_tag_[Key] = [Value] Security groups are comma-separated in 'ec2_security_group_ids' and 'ec2_security_group_names'. ''' # (c) 2012, Peter Sankauskas # # 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 . ###################################################################### import sys import os import argparse import re from time import time import boto from boto import ec2 from boto import rds from boto import elasticache from boto import route53 import six from six.moves import configparser from collections import defaultdict try: import json except ImportError: import simplejson as json class Ec2Inventory(object): def _empty_inventory(self): return {"_meta" : {"hostvars" : {}}} def __init__(self): ''' Main execution path ''' # Inventory grouped by instance IDs, tags, security groups, regions, # and availability zones self.inventory = self._empty_inventory() # Index of hostname (address) to instance ID self.index = {} # Read settings and parse CLI arguments self.read_settings() self.parse_cli_args() # Cache if self.args.refresh_cache: self.do_api_calls_update_cache() elif not self.is_cache_valid(): self.do_api_calls_update_cache() # Data to print if self.args.host: data_to_print = self.get_host_info() elif self.args.list: # Display list of instances for inventory if self.inventory == self._empty_inventory(): data_to_print = self.get_inventory_from_cache() else: data_to_print = self.json_format_dict(self.inventory, True) print(data_to_print) def is_cache_valid(self): ''' Determines if the cache files have expired, or if it is still valid ''' if os.path.isfile(self.cache_path_cache): mod_time = os.path.getmtime(self.cache_path_cache) current_time = time() if (mod_time + self.cache_max_age) > current_time: if os.path.isfile(self.cache_path_index): return True return False def read_settings(self): ''' Reads the settings from the ec2.ini file ''' if six.PY2: config = configparser.SafeConfigParser() else: config = configparser.ConfigParser() ec2_default_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'ec2.ini') ec2_ini_path = os.environ.get('EC2_INI_PATH', ec2_default_ini_path) config.read(ec2_ini_path) # is eucalyptus? self.eucalyptus_host = None self.eucalyptus = False if config.has_option('ec2', 'eucalyptus'): self.eucalyptus = config.getboolean('ec2', 'eucalyptus') if self.eucalyptus and config.has_option('ec2', 'eucalyptus_host'): self.eucalyptus_host = config.get('ec2', 'eucalyptus_host') # Regions self.regions = [] configRegions = config.get('ec2', 'regions') configRegions_exclude = config.get('ec2', 'regions_exclude') if (configRegions == 'all'): if self.eucalyptus_host: self.regions.append(boto.connect_euca(host=self.eucalyptus_host).region.name) else: for regionInfo in ec2.regions(): if regionInfo.name not in configRegions_exclude: self.regions.append(regionInfo.name) else: self.regions = configRegions.split(",") # Destination addresses self.destination_variable = config.get('ec2', 'destination_variable') self.vpc_destination_variable = config.get('ec2', 'vpc_destination_variable') # Route53 self.route53_enabled = config.getboolean('ec2', 'route53') self.route53_excluded_zones = [] if config.has_option('ec2', 'route53_excluded_zones'): self.route53_excluded_zones.extend( config.get('ec2', 'route53_excluded_zones', '').split(',')) # Include RDS instances? self.rds_enabled = True if config.has_option('ec2', 'rds'): self.rds_enabled = config.getboolean('ec2', 'rds') # Include ElastiCache instances? self.elasticache_enabled = True if config.has_option('ec2', 'elasticache'): self.elasticache_enabled = config.getboolean('ec2', 'elasticache') # Return all EC2 instances? if config.has_option('ec2', 'all_instances'): self.all_instances = config.getboolean('ec2', 'all_instances') else: self.all_instances = False # Return all RDS instances? (if RDS is enabled) if config.has_option('ec2', 'all_rds_instances') and self.rds_enabled: self.all_rds_instances = config.getboolean('ec2', 'all_rds_instances') else: self.all_rds_instances = False # Return all ElastiCache replication groups? (if ElastiCache is enabled) if config.has_option('ec2', 'all_elasticache_replication_groups') and self.elasticache_enabled: self.all_elasticache_replication_groups = config.getboolean('ec2', 'all_elasticache_replication_groups') else: self.all_elasticache_replication_groups = False # Return all ElastiCache clusters? (if ElastiCache is enabled) if config.has_option('ec2', 'all_elasticache_clusters') and self.elasticache_enabled: self.all_elasticache_clusters = config.getboolean('ec2', 'all_elasticache_clusters') else: self.all_elasticache_clusters = False # Return all ElastiCache nodes? (if ElastiCache is enabled) if config.has_option('ec2', 'all_elasticache_nodes') and self.elasticache_enabled: self.all_elasticache_nodes = config.getboolean('ec2', 'all_elasticache_nodes') else: self.all_elasticache_nodes = False # Cache related cache_dir = os.path.expanduser(config.get('ec2', 'cache_path')) if not os.path.exists(cache_dir): os.makedirs(cache_dir) self.cache_path_cache = cache_dir + "/ansible-ec2.cache" self.cache_path_index = cache_dir + "/ansible-ec2.index" self.cache_max_age = config.getint('ec2', 'cache_max_age') # Configure nested groups instead of flat namespace. if config.has_option('ec2', 'nested_groups'): self.nested_groups = config.getboolean('ec2', 'nested_groups') else: self.nested_groups = False # Configure which groups should be created. group_by_options = [ 'group_by_instance_id', 'group_by_region', 'group_by_availability_zone', 'group_by_ami_id', 'group_by_instance_type', 'group_by_key_pair', 'group_by_vpc_id', 'group_by_security_group', 'group_by_tag_keys', 'group_by_tag_none', 'group_by_route53_names', 'group_by_rds_engine', 'group_by_rds_parameter_group', 'group_by_elasticache_engine', 'group_by_elasticache_cluster', 'group_by_elasticache_parameter_group', 'group_by_elasticache_replication_group', ] for option in group_by_options: if config.has_option('ec2', option): setattr(self, option, config.getboolean('ec2', option)) else: setattr(self, option, True) # Do we need to just include hosts that match a pattern? try: pattern_include = config.get('ec2', 'pattern_include') if pattern_include and len(pattern_include) > 0: self.pattern_include = re.compile(pattern_include) else: self.pattern_include = None except configparser.NoOptionError as e: self.pattern_include = None # Do we need to exclude hosts that match a pattern? try: pattern_exclude = config.get('ec2', 'pattern_exclude'); if pattern_exclude and len(pattern_exclude) > 0: self.pattern_exclude = re.compile(pattern_exclude) else: self.pattern_exclude = None except configparser.NoOptionError as e: self.pattern_exclude = None # Instance filters (see boto and EC2 API docs). Ignore invalid filters. self.ec2_instance_filters = defaultdict(list) if config.has_option('ec2', 'instance_filters'): for instance_filter in config.get('ec2', 'instance_filters', '').split(','): instance_filter = instance_filter.strip() if not instance_filter or '=' not in instance_filter: continue filter_key, filter_value = [x.strip() for x in instance_filter.split('=', 1)] if not filter_key: continue self.ec2_instance_filters[filter_key].append(filter_value) def parse_cli_args(self): ''' Command line argument processing ''' parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on EC2') parser.add_argument('--list', action='store_true', default=True, help='List instances (default: True)') parser.add_argument('--host', action='store', help='Get all the variables about a specific instance') parser.add_argument('--refresh-cache', action='store_true', default=False, help='Force refresh of cache by making API requests to EC2 (default: False - use cache files)') self.args = parser.parse_args() def do_api_calls_update_cache(self): ''' Do API calls to each region, and save data in cache files ''' if self.route53_enabled: self.get_route53_records() for region in self.regions: self.get_instances_by_region(region) if self.rds_enabled: self.get_rds_instances_by_region(region) if self.elasticache_enabled: self.get_elasticache_clusters_by_region(region) self.get_elasticache_replication_groups_by_region(region) self.write_to_cache(self.inventory, self.cache_path_cache) self.write_to_cache(self.index, self.cache_path_index) def connect(self, region): ''' create connection to api server''' if self.eucalyptus: conn = boto.connect_euca(host=self.eucalyptus_host) conn.APIVersion = '2010-08-31' else: conn = ec2.connect_to_region(region) # connect_to_region will fail "silently" by returning None if the region name is wrong or not supported if conn is None: self.fail_with_error("region name: %s likely not supported, or AWS is down. connection to region failed." % region) return conn def get_instances_by_region(self, region): ''' Makes an AWS EC2 API call to the list of instances in a particular region ''' try: conn = self.connect(region) reservations = [] if self.ec2_instance_filters: for filter_key, filter_values in self.ec2_instance_filters.items(): reservations.extend(conn.get_all_instances(filters = { filter_key : filter_values })) else: reservations = conn.get_all_instances() for reservation in reservations: for instance in reservation.instances: self.add_instance(instance, region) except boto.exception.BotoServerError as e: if e.error_code == 'AuthFailure': error = self.get_auth_error_message() else: backend = 'Eucalyptus' if self.eucalyptus else 'AWS' error = "Error connecting to %s backend.\n%s" % (backend, e.message) self.fail_with_error(error) def get_rds_instances_by_region(self, region): ''' Makes an AWS API call to the list of RDS instances in a particular region ''' try: conn = rds.connect_to_region(region) if conn: instances = conn.get_all_dbinstances() for instance in instances: self.add_rds_instance(instance, region) except boto.exception.BotoServerError as e: error = e.reason if e.error_code == 'AuthFailure': error = self.get_auth_error_message() if not e.reason == "Forbidden": error = "Looks like AWS RDS is down:\n%s" % e.message self.fail_with_error(error) def get_elasticache_clusters_by_region(self, region): ''' Makes an AWS API call to the list of ElastiCache clusters (with nodes' info) in a particular region.''' # ElastiCache boto module doesn't provide a get_all_intances method, # that's why we need to call describe directly (it would be called by # the shorthand method anyway...) try: conn = elasticache.connect_to_region(region) if conn: # show_cache_node_info = True # because we also want nodes' information response = conn.describe_cache_clusters(None, None, None, True) except boto.exception.BotoServerError as e: error = e.reason if e.error_code == 'AuthFailure': error = self.get_auth_error_message() if not e.reason == "Forbidden": error = "Looks like AWS ElastiCache is down:\n%s" % e.message self.fail_with_error(error) try: # Boto also doesn't provide wrapper classes to CacheClusters or # CacheNodes. Because of that wo can't make use of the get_list # method in the AWSQueryConnection. Let's do the work manually clusters = response['DescribeCacheClustersResponse']['DescribeCacheClustersResult']['CacheClusters'] except KeyError as e: error = "ElastiCache query to AWS failed (unexpected format)." self.fail_with_error(error) for cluster in clusters: self.add_elasticache_cluster(cluster, region) def get_elasticache_replication_groups_by_region(self, region): ''' Makes an AWS API call to the list of ElastiCache replication groups in a particular region.''' # ElastiCache boto module doesn't provide a get_all_intances method, # that's why we need to call describe directly (it would be called by # the shorthand method anyway...) try: conn = elasticache.connect_to_region(region) if conn: response = conn.describe_replication_groups() except boto.exception.BotoServerError as e: error = e.reason if e.error_code == 'AuthFailure': error = self.get_auth_error_message() if not e.reason == "Forbidden": error = "Looks like AWS ElastiCache [Replication Groups] is down:\n%s" % e.message self.fail_with_error(error) try: # Boto also doesn't provide wrapper classes to ReplicationGroups # Because of that wo can't make use of the get_list method in the # AWSQueryConnection. Let's do the work manually replication_groups = response['DescribeReplicationGroupsResponse']['DescribeReplicationGroupsResult']['ReplicationGroups'] except KeyError as e: error = "ElastiCache [Replication Groups] query to AWS failed (unexpected format)." self.fail_with_error(error) for replication_group in replication_groups: self.add_elasticache_replication_group(replication_group, region) def get_auth_error_message(self): ''' create an informative error message if there is an issue authenticating''' errors = ["Authentication error retrieving ec2 inventory."] if None in [os.environ.get('AWS_ACCESS_KEY_ID'), os.environ.get('AWS_SECRET_ACCESS_KEY')]: errors.append(' - No AWS_ACCESS_KEY_ID or AWS_SECRET_ACCESS_KEY environment vars found') else: errors.append(' - AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY environment vars found but may not be correct') boto_paths = ['/etc/boto.cfg', '~/.boto', '~/.aws/credentials'] boto_config_found = list(p for p in boto_paths if os.path.isfile(os.path.expanduser(p))) if len(boto_config_found) > 0: errors.append(" - Boto configs found at '%s', but the credentials contained may not be correct" % ', '.join(boto_config_found)) else: errors.append(" - No Boto config found at any expected location '%s'" % ', '.join(boto_paths)) return '\n'.join(errors) def fail_with_error(self, err_msg): '''log an error to std err for ansible-playbook to consume and exit''' sys.stderr.write(err_msg) sys.exit(1) def get_instance(self, region, instance_id): conn = self.connect(region) reservations = conn.get_all_instances([instance_id]) for reservation in reservations: for instance in reservation.instances: return instance def add_instance(self, instance, region): ''' Adds an instance to the inventory and index, as long as it is addressable ''' # Only want running instances unless all_instances is True if not self.all_instances and instance.state != 'running': return # Select the best destination address if instance.subnet_id: dest = getattr(instance, self.vpc_destination_variable, None) if dest is None: dest = getattr(instance, 'tags').get(self.vpc_destination_variable, None) else: dest = getattr(instance, self.destination_variable, None) if dest is None: dest = getattr(instance, 'tags').get(self.destination_variable, None) if not dest: # Skip instances we cannot address (e.g. private VPC subnet) return # if we only want to include hosts that match a pattern, skip those that don't if self.pattern_include and not self.pattern_include.match(dest): return # if we need to exclude hosts that match a pattern, skip those if self.pattern_exclude and self.pattern_exclude.match(dest): return # Add to index self.index[dest] = [region, instance.id] # Inventory: Group by instance ID (always a group of 1) if self.group_by_instance_id: self.inventory[instance.id] = [dest] if self.nested_groups: self.push_group(self.inventory, 'instances', instance.id) # Inventory: Group by region if self.group_by_region: self.push(self.inventory, region, dest) if self.nested_groups: self.push_group(self.inventory, 'regions', region) # Inventory: Group by availability zone if self.group_by_availability_zone: self.push(self.inventory, instance.placement, dest) if self.nested_groups: if self.group_by_region: self.push_group(self.inventory, region, instance.placement) self.push_group(self.inventory, 'zones', instance.placement) # Inventory: Group by Amazon Machine Image (AMI) ID if self.group_by_ami_id: ami_id = self.to_safe(instance.image_id) self.push(self.inventory, ami_id, dest) if self.nested_groups: self.push_group(self.inventory, 'images', ami_id) # Inventory: Group by instance type if self.group_by_instance_type: type_name = self.to_safe('type_' + instance.instance_type) self.push(self.inventory, type_name, dest) if self.nested_groups: self.push_group(self.inventory, 'types', type_name) # Inventory: Group by key pair if self.group_by_key_pair and instance.key_name: key_name = self.to_safe('key_' + instance.key_name) self.push(self.inventory, key_name, dest) if self.nested_groups: self.push_group(self.inventory, 'keys', key_name) # Inventory: Group by VPC if self.group_by_vpc_id and instance.vpc_id: vpc_id_name = self.to_safe('vpc_id_' + instance.vpc_id) self.push(self.inventory, vpc_id_name, dest) if self.nested_groups: self.push_group(self.inventory, 'vpcs', vpc_id_name) # Inventory: Group by security group if self.group_by_security_group: try: for group in instance.groups: key = self.to_safe("security_group_" + group.name) self.push(self.inventory, key, dest) if self.nested_groups: self.push_group(self.inventory, 'security_groups', key) except AttributeError: self.fail_with_error('\n'.join(['Package boto seems a bit older.', 'Please upgrade boto >= 2.3.0.'])) # Inventory: Group by tag keys if self.group_by_tag_keys: for k, v in instance.tags.items(): key = self.to_safe("tag_" + k + "=" + v) self.push(self.inventory, key, dest) if self.nested_groups: self.push_group(self.inventory, 'tags', self.to_safe("tag_" + k)) self.push_group(self.inventory, self.to_safe("tag_" + k), key) # Inventory: Group by Route53 domain names if enabled if self.route53_enabled and self.group_by_route53_names: route53_names = self.get_instance_route53_names(instance) for name in route53_names: self.push(self.inventory, name, dest) if self.nested_groups: self.push_group(self.inventory, 'route53', name) # Global Tag: instances without tags if self.group_by_tag_none and len(instance.tags) == 0: self.push(self.inventory, 'tag_none', dest) if self.nested_groups: self.push_group(self.inventory, 'tags', 'tag_none') # Global Tag: tag all EC2 instances self.push(self.inventory, 'ec2', dest) self.inventory["_meta"]["hostvars"][dest] = self.get_host_info_dict_from_instance(instance) def add_rds_instance(self, instance, region): ''' Adds an RDS instance to the inventory and index, as long as it is addressable ''' # Only want available instances unless all_rds_instances is True if not self.all_rds_instances and instance.status != 'available': return # Select the best destination address dest = instance.endpoint[0] if not dest: # Skip instances we cannot address (e.g. private VPC subnet) return # Add to index self.index[dest] = [region, instance.id] # Inventory: Group by instance ID (always a group of 1) if self.group_by_instance_id: self.inventory[instance.id] = [dest] if self.nested_groups: self.push_group(self.inventory, 'instances', instance.id) # Inventory: Group by region if self.group_by_region: self.push(self.inventory, region, dest) if self.nested_groups: self.push_group(self.inventory, 'regions', region) # Inventory: Group by availability zone if self.group_by_availability_zone: self.push(self.inventory, instance.availability_zone, dest) if self.nested_groups: if self.group_by_region: self.push_group(self.inventory, region, instance.availability_zone) self.push_group(self.inventory, 'zones', instance.availability_zone) # Inventory: Group by instance type if self.group_by_instance_type: type_name = self.to_safe('type_' + instance.instance_class) self.push(self.inventory, type_name, dest) if self.nested_groups: self.push_group(self.inventory, 'types', type_name) # Inventory: Group by VPC if self.group_by_vpc_id and instance.subnet_group and instance.subnet_group.vpc_id: vpc_id_name = self.to_safe('vpc_id_' + instance.subnet_group.vpc_id) self.push(self.inventory, vpc_id_name, dest) if self.nested_groups: self.push_group(self.inventory, 'vpcs', vpc_id_name) # Inventory: Group by security group if self.group_by_security_group: try: if instance.security_group: key = self.to_safe("security_group_" + instance.security_group.name) self.push(self.inventory, key, dest) if self.nested_groups: self.push_group(self.inventory, 'security_groups', key) except AttributeError: self.fail_with_error('\n'.join(['Package boto seems a bit older.', 'Please upgrade boto >= 2.3.0.'])) # Inventory: Group by engine if self.group_by_rds_engine: self.push(self.inventory, self.to_safe("rds_" + instance.engine), dest) if self.nested_groups: self.push_group(self.inventory, 'rds_engines', self.to_safe("rds_" + instance.engine)) # Inventory: Group by parameter group if self.group_by_rds_parameter_group: self.push(self.inventory, self.to_safe("rds_parameter_group_" + instance.parameter_group.name), dest) if self.nested_groups: self.push_group(self.inventory, 'rds_parameter_groups', self.to_safe("rds_parameter_group_" + instance.parameter_group.name)) # Global Tag: all RDS instances self.push(self.inventory, 'rds', dest) self.inventory["_meta"]["hostvars"][dest] = self.get_host_info_dict_from_instance(instance) def add_elasticache_cluster(self, cluster, region): ''' Adds an ElastiCache cluster to the inventory and index, as long as it's nodes are addressable ''' # Only want available clusters unless all_elasticache_clusters is True if not self.all_elasticache_clusters and cluster['CacheClusterStatus'] != 'available': return # Select the best destination address if 'ConfigurationEndpoint' in cluster and cluster['ConfigurationEndpoint']: # Memcached cluster dest = cluster['ConfigurationEndpoint']['Address'] is_redis = False else: # Redis sigle node cluster # Because all Redis clusters are single nodes, we'll merge the # info from the cluster with info about the node dest = cluster['CacheNodes'][0]['Endpoint']['Address'] is_redis = True if not dest: # Skip clusters we cannot address (e.g. private VPC subnet) return # Add to index self.index[dest] = [region, cluster['CacheClusterId']] # Inventory: Group by instance ID (always a group of 1) if self.group_by_instance_id: self.inventory[cluster['CacheClusterId']] = [dest] if self.nested_groups: self.push_group(self.inventory, 'instances', cluster['CacheClusterId']) # Inventory: Group by region if self.group_by_region and not is_redis: self.push(self.inventory, region, dest) if self.nested_groups: self.push_group(self.inventory, 'regions', region) # Inventory: Group by availability zone if self.group_by_availability_zone and not is_redis: self.push(self.inventory, cluster['PreferredAvailabilityZone'], dest) if self.nested_groups: if self.group_by_region: self.push_group(self.inventory, region, cluster['PreferredAvailabilityZone']) self.push_group(self.inventory, 'zones', cluster['PreferredAvailabilityZone']) # Inventory: Group by node type if self.group_by_instance_type and not is_redis: type_name = self.to_safe('type_' + cluster['CacheNodeType']) self.push(self.inventory, type_name, dest) if self.nested_groups: self.push_group(self.inventory, 'types', type_name) # Inventory: Group by VPC (information not available in the current # AWS API version for ElastiCache) # Inventory: Group by security group if self.group_by_security_group and not is_redis: # Check for the existance of the 'SecurityGroups' key and also if # this key has some value. When the cluster is not placed in a SG # the query can return None here and cause an error. if 'SecurityGroups' in cluster and cluster['SecurityGroups'] is not None: for security_group in cluster['SecurityGroups']: key = self.to_safe("security_group_" + security_group['SecurityGroupId']) self.push(self.inventory, key, dest) if self.nested_groups: self.push_group(self.inventory, 'security_groups', key) # Inventory: Group by engine if self.group_by_elasticache_engine and not is_redis: self.push(self.inventory, self.to_safe("elasticache_" + cluster['Engine']), dest) if self.nested_groups: self.push_group(self.inventory, 'elasticache_engines', self.to_safe(cluster['Engine'])) # Inventory: Group by parameter group if self.group_by_elasticache_parameter_group: self.push(self.inventory, self.to_safe("elasticache_parameter_group_" + cluster['CacheParameterGroup']['CacheParameterGroupName']), dest) if self.nested_groups: self.push_group(self.inventory, 'elasticache_parameter_groups', self.to_safe(cluster['CacheParameterGroup']['CacheParameterGroupName'])) # Inventory: Group by replication group if self.group_by_elasticache_replication_group and 'ReplicationGroupId' in cluster and cluster['ReplicationGroupId']: self.push(self.inventory, self.to_safe("elasticache_replication_group_" + cluster['ReplicationGroupId']), dest) if self.nested_groups: self.push_group(self.inventory, 'elasticache_replication_groups', self.to_safe(cluster['ReplicationGroupId'])) # Global Tag: all ElastiCache clusters self.push(self.inventory, 'elasticache_clusters', cluster['CacheClusterId']) host_info = self.get_host_info_dict_from_describe_dict(cluster) self.inventory["_meta"]["hostvars"][dest] = host_info # Add the nodes for node in cluster['CacheNodes']: self.add_elasticache_node(node, cluster, region) def add_elasticache_node(self, node, cluster, region): ''' Adds an ElastiCache node to the inventory and index, as long as it is addressable ''' # Only want available nodes unless all_elasticache_nodes is True if not self.all_elasticache_nodes and node['CacheNodeStatus'] != 'available': return # Select the best destination address dest = node['Endpoint']['Address'] if not dest: # Skip nodes we cannot address (e.g. private VPC subnet) return node_id = self.to_safe(cluster['CacheClusterId'] + '_' + node['CacheNodeId']) # Add to index self.index[dest] = [region, node_id] # Inventory: Group by node ID (always a group of 1) if self.group_by_instance_id: self.inventory[node_id] = [dest] if self.nested_groups: self.push_group(self.inventory, 'instances', node_id) # Inventory: Group by region if self.group_by_region: self.push(self.inventory, region, dest) if self.nested_groups: self.push_group(self.inventory, 'regions', region) # Inventory: Group by availability zone if self.group_by_availability_zone: self.push(self.inventory, cluster['PreferredAvailabilityZone'], dest) if self.nested_groups: if self.group_by_region: self.push_group(self.inventory, region, cluster['PreferredAvailabilityZone']) self.push_group(self.inventory, 'zones', cluster['PreferredAvailabilityZone']) # Inventory: Group by node type if self.group_by_instance_type: type_name = self.to_safe('type_' + cluster['CacheNodeType']) self.push(self.inventory, type_name, dest) if self.nested_groups: self.push_group(self.inventory, 'types', type_name) # Inventory: Group by VPC (information not available in the current # AWS API version for ElastiCache) # Inventory: Group by security group if self.group_by_security_group: # Check for the existance of the 'SecurityGroups' key and also if # this key has some value. When the cluster is not placed in a SG # the query can return None here and cause an error. if 'SecurityGroups' in cluster and cluster['SecurityGroups'] is not None: for security_group in cluster['SecurityGroups']: key = self.to_safe("security_group_" + security_group['SecurityGroupId']) self.push(self.inventory, key, dest) if self.nested_groups: self.push_group(self.inventory, 'security_groups', key) # Inventory: Group by engine if self.group_by_elasticache_engine: self.push(self.inventory, self.to_safe("elasticache_" + cluster['Engine']), dest) if self.nested_groups: self.push_group(self.inventory, 'elasticache_engines', self.to_safe("elasticache_" + cluster['Engine'])) # Inventory: Group by parameter group (done at cluster level) # Inventory: Group by replication group (done at cluster level) # Inventory: Group by ElastiCache Cluster if self.group_by_elasticache_cluster: self.push(self.inventory, self.to_safe("elasticache_cluster_" + cluster['CacheClusterId']), dest) # Global Tag: all ElastiCache nodes self.push(self.inventory, 'elasticache_nodes', dest) host_info = self.get_host_info_dict_from_describe_dict(node) if dest in self.inventory["_meta"]["hostvars"]: self.inventory["_meta"]["hostvars"][dest].update(host_info) else: self.inventory["_meta"]["hostvars"][dest] = host_info def add_elasticache_replication_group(self, replication_group, region): ''' Adds an ElastiCache replication group to the inventory and index ''' # Only want available clusters unless all_elasticache_replication_groups is True if not self.all_elasticache_replication_groups and replication_group['Status'] != 'available': return # Select the best destination address (PrimaryEndpoint) dest = replication_group['NodeGroups'][0]['PrimaryEndpoint']['Address'] if not dest: # Skip clusters we cannot address (e.g. private VPC subnet) return # Add to index self.index[dest] = [region, replication_group['ReplicationGroupId']] # Inventory: Group by ID (always a group of 1) if self.group_by_instance_id: self.inventory[replication_group['ReplicationGroupId']] = [dest] if self.nested_groups: self.push_group(self.inventory, 'instances', replication_group['ReplicationGroupId']) # Inventory: Group by region if self.group_by_region: self.push(self.inventory, region, dest) if self.nested_groups: self.push_group(self.inventory, 'regions', region) # Inventory: Group by availability zone (doesn't apply to replication groups) # Inventory: Group by node type (doesn't apply to replication groups) # Inventory: Group by VPC (information not available in the current # AWS API version for replication groups # Inventory: Group by security group (doesn't apply to replication groups) # Check this value in cluster level # Inventory: Group by engine (replication groups are always Redis) if self.group_by_elasticache_engine: self.push(self.inventory, 'elasticache_redis', dest) if self.nested_groups: self.push_group(self.inventory, 'elasticache_engines', 'redis') # Global Tag: all ElastiCache clusters self.push(self.inventory, 'elasticache_replication_groups', replication_group['ReplicationGroupId']) host_info = self.get_host_info_dict_from_describe_dict(replication_group) self.inventory["_meta"]["hostvars"][dest] = host_info def get_route53_records(self): ''' Get and store the map of resource records to domain names that point to them. ''' r53_conn = route53.Route53Connection() all_zones = r53_conn.get_zones() route53_zones = [ zone for zone in all_zones if zone.name[:-1] not in self.route53_excluded_zones ] self.route53_records = {} for zone in route53_zones: rrsets = r53_conn.get_all_rrsets(zone.id) for record_set in rrsets: record_name = record_set.name if record_name.endswith('.'): record_name = record_name[:-1] for resource in record_set.resource_records: self.route53_records.setdefault(resource, set()) self.route53_records[resource].add(record_name) def get_instance_route53_names(self, instance): ''' Check if an instance is referenced in the records we have from Route53. If it is, return the list of domain names pointing to said instance. If nothing points to it, return an empty list. ''' instance_attributes = [ 'public_dns_name', 'private_dns_name', 'ip_address', 'private_ip_address' ] name_list = set() for attrib in instance_attributes: try: value = getattr(instance, attrib) except AttributeError: continue if value in self.route53_records: name_list.update(self.route53_records[value]) return list(name_list) def get_host_info_dict_from_instance(self, instance): instance_vars = {} for key in vars(instance): value = getattr(instance, key) key = self.to_safe('ec2_' + key) # Handle complex types # state/previous_state changed to properties in boto in https://github.com/boto/boto/commit/a23c379837f698212252720d2af8dec0325c9518 if key == 'ec2__state': instance_vars['ec2_state'] = instance.state or '' instance_vars['ec2_state_code'] = instance.state_code elif key == 'ec2__previous_state': instance_vars['ec2_previous_state'] = instance.previous_state or '' instance_vars['ec2_previous_state_code'] = instance.previous_state_code elif type(value) in [int, bool]: instance_vars[key] = value elif isinstance(value, six.string_types): instance_vars[key] = value.strip() elif type(value) == type(None): instance_vars[key] = '' elif key == 'ec2_region': instance_vars[key] = value.name elif key == 'ec2__placement': instance_vars['ec2_placement'] = value.zone elif key == 'ec2_tags': for k, v in value.items(): key = self.to_safe('ec2_tag_' + k) instance_vars[key] = v elif key == 'ec2_groups': group_ids = [] group_names = [] for group in value: group_ids.append(group.id) group_names.append(group.name) instance_vars["ec2_security_group_ids"] = ','.join([str(i) for i in group_ids]) instance_vars["ec2_security_group_names"] = ','.join([str(i) for i in group_names]) else: pass # TODO Product codes if someone finds them useful #print key #print type(value) #print value return instance_vars def get_host_info_dict_from_describe_dict(self, describe_dict): ''' Parses the dictionary returned by the API call into a flat list of parameters. This method should be used only when 'describe' is used directly because Boto doesn't provide specific classes. ''' # I really don't agree with prefixing everything with 'ec2' # because EC2, RDS and ElastiCache are different services. # I'm just following the pattern used until now to not break any # compatibility. host_info = {} for key in describe_dict: value = describe_dict[key] key = self.to_safe('ec2_' + self.uncammelize(key)) # Handle complex types # Target: Memcached Cache Clusters if key == 'ec2_configuration_endpoint' and value: host_info['ec2_configuration_endpoint_address'] = value['Address'] host_info['ec2_configuration_endpoint_port'] = value['Port'] # Target: Cache Nodes and Redis Cache Clusters (single node) if key == 'ec2_endpoint' and value: host_info['ec2_endpoint_address'] = value['Address'] host_info['ec2_endpoint_port'] = value['Port'] # Target: Redis Replication Groups if key == 'ec2_node_groups' and value: host_info['ec2_endpoint_address'] = value[0]['PrimaryEndpoint']['Address'] host_info['ec2_endpoint_port'] = value[0]['PrimaryEndpoint']['Port'] replica_count = 0 for node in value[0]['NodeGroupMembers']: if node['CurrentRole'] == 'primary': host_info['ec2_primary_cluster_address'] = node['ReadEndpoint']['Address'] host_info['ec2_primary_cluster_port'] = node['ReadEndpoint']['Port'] host_info['ec2_primary_cluster_id'] = node['CacheClusterId'] elif node['CurrentRole'] == 'replica': host_info['ec2_replica_cluster_address_'+ str(replica_count)] = node['ReadEndpoint']['Address'] host_info['ec2_replica_cluster_port_'+ str(replica_count)] = node['ReadEndpoint']['Port'] host_info['ec2_replica_cluster_id_'+ str(replica_count)] = node['CacheClusterId'] replica_count += 1 # Target: Redis Replication Groups if key == 'ec2_member_clusters' and value: host_info['ec2_member_clusters'] = ','.join([str(i) for i in value]) # Target: All Cache Clusters elif key == 'ec2_cache_parameter_group': host_info["ec2_cache_node_ids_to_reboot"] = ','.join([str(i) for i in value['CacheNodeIdsToReboot']]) host_info['ec2_cache_parameter_group_name'] = value['CacheParameterGroupName'] host_info['ec2_cache_parameter_apply_status'] = value['ParameterApplyStatus'] # Target: Almost everything elif key == 'ec2_security_groups': # Skip if SecurityGroups is None # (it is possible to have the key defined but no value in it). if value is not None: sg_ids = [] for sg in value: sg_ids.append(sg['SecurityGroupId']) host_info["ec2_security_group_ids"] = ','.join([str(i) for i in sg_ids]) # Target: Everything # Preserve booleans and integers elif type(value) in [int, bool]: host_info[key] = value # Target: Everything # Sanitize string values elif isinstance(value, six.string_types): host_info[key] = value.strip() # Target: Everything # Replace None by an empty string elif type(value) == type(None): host_info[key] = '' else: # Remove non-processed complex types pass return host_info def get_host_info(self): ''' Get variables about a specific host ''' if len(self.index) == 0: # Need to load index from cache self.load_index_from_cache() if not self.args.host in self.index: # try updating the cache self.do_api_calls_update_cache() if not self.args.host in self.index: # host might not exist anymore return self.json_format_dict({}, True) (region, instance_id) = self.index[self.args.host] instance = self.get_instance(region, instance_id) return self.json_format_dict(self.get_host_info_dict_from_instance(instance), True) def push(self, my_dict, key, element): ''' Push an element onto an array that may not have been defined in the dict ''' group_info = my_dict.setdefault(key, []) if isinstance(group_info, dict): host_list = group_info.setdefault('hosts', []) host_list.append(element) else: group_info.append(element) def push_group(self, my_dict, key, element): ''' Push a group as a child of another group. ''' parent_group = my_dict.setdefault(key, {}) if not isinstance(parent_group, dict): parent_group = my_dict[key] = {'hosts': parent_group} child_groups = parent_group.setdefault('children', []) if element not in child_groups: child_groups.append(element) def get_inventory_from_cache(self): ''' Reads the inventory from the cache file and returns it as a JSON object ''' cache = open(self.cache_path_cache, 'r') json_inventory = cache.read() return json_inventory def load_index_from_cache(self): ''' Reads the index from the cache file sets self.index ''' cache = open(self.cache_path_index, 'r') json_index = cache.read() self.index = json.loads(json_index) def write_to_cache(self, data, filename): ''' Writes data in JSON format to a file ''' json_data = self.json_format_dict(data, True) cache = open(filename, 'w') cache.write(json_data) cache.close() def uncammelize(self, key): temp = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', key) return re.sub('([a-z0-9])([A-Z])', r'\1_\2', temp).lower() def to_safe(self, word): ''' Converts 'bad' characters in a string to underscores so they can be used as Ansible groups ''' return re.sub("[^A-Za-z0-9\_]", "_", word) def json_format_dict(self, data, pretty=False): ''' Converts a dict to a JSON object and dumps it as a formatted string ''' if pretty: return json.dumps(data, sort_keys=True, indent=2) else: return json.dumps(data) # Run the script Ec2Inventory()