#!/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

If you're using boto profiles (requires boto>=2.24.0) you can choose a profile
using the --boto-profile command line argument (e.g. ec2.py --boto-profile prod) or using
the AWS_PROFILE variable:

    AWS_PROFILE=prod ansible-playbook -i ec2.py myplaybook.yml

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_block_devices
 - 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 <http://www.gnu.org/licenses/>.

######################################################################

import sys
import os
import argparse
import re
from time import time
import boto
from boto import ec2
import six

HAS_BOTO3 = False
try:
    import boto3
    HAS_BOTO3 = True
except ImportError:
    pass

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 = {}

        # Boto profile to use (if any)
        self.boto_profile = None

        # AWS credentials.
        self.credentials = {}

        # Read settings and parse CLI arguments
        self.parse_cli_args()
        self.read_settings()

        # Make sure that profile_name is not passed at all if not set
        # as pre 2.24 boto will fall over otherwise
        if self.boto_profile:
            if not hasattr(boto.ec2.EC2Connection, 'profile_name'):
                self.fail_with_error("boto version must be >= 2.24 to use profile")

        # 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.PY3:
            config = configparser.ConfigParser()
        else:
            config = configparser.SafeConfigParser()
        ec2_default_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), '../../tmp/ec2.ini')
        ec2_ini_path = os.path.expanduser(os.path.expandvars(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, **self.credentials)
            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')

        if config.has_option('ec2', 'hostname_variable'):
            self.hostname_variable = config.get('ec2', 'hostname_variable')
        else:
            self.hostname_variable = None

        if config.has_option('ec2', 'destination_format') and \
           config.has_option('ec2', 'destination_format_tags'):
            self.destination_format = config.get('ec2', 'destination_format')
            self.destination_format_tags = config.get('ec2', 'destination_format_tags').split(',')
        else:
            self.destination_format = None
            self.destination_format_tags = None

        # Return all EC2 instances?
        if config.has_option('ec2', 'all_instances'):
            self.all_instances = config.getboolean('ec2', 'all_instances')
        else:
            self.all_instances = False

        # Instance states to be gathered in inventory. Default is 'running'.
        # Setting 'all_instances' to 'yes' overrides this option.
        ec2_valid_instance_states = [
            'pending',
            'running',
            'shutting-down',
            'terminated',
            'stopping',
            'stopped'
        ]
        self.ec2_instance_states = []
        if self.all_instances:
            self.ec2_instance_states = ec2_valid_instance_states
        elif config.has_option('ec2', 'instance_states'):
          for instance_state in config.get('ec2', 'instance_states').split(','):
            instance_state = instance_state.strip()
            if instance_state not in ec2_valid_instance_states:
              continue
            self.ec2_instance_states.append(instance_state)
        else:
          self.ec2_instance_states = ['running']

        # 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

        # boto configuration profile (prefer CLI argument)
        self.boto_profile = self.args.boto_profile
        if config.has_option('ec2', 'boto_profile') and not self.boto_profile:
            self.boto_profile = config.get('ec2', 'boto_profile')

        # AWS credentials (prefer environment variables)
        if not (self.boto_profile or os.environ.get('AWS_ACCESS_KEY_ID') or
                os.environ.get('AWS_PROFILE')):
            if config.has_option('credentials', 'aws_access_key_id'):
                aws_access_key_id = config.get('credentials', 'aws_access_key_id')
            else:
                aws_access_key_id = None
            if config.has_option('credentials', 'aws_secret_access_key'):
                aws_secret_access_key = config.get('credentials', 'aws_secret_access_key')
            else:
                aws_secret_access_key = None
            if config.has_option('credentials', 'aws_security_token'):
                aws_security_token = config.get('credentials', 'aws_security_token')
            else:
                aws_security_token = None
            if aws_access_key_id:
                self.credentials = {
                    'aws_access_key_id': aws_access_key_id,
                    'aws_secret_access_key': aws_secret_access_key
                }
                if aws_security_token:
                    self.credentials['security_token'] = aws_security_token

        # Cache related
        cache_dir = os.path.expanduser(config.get('ec2', 'cache_path'))
        if self.boto_profile:
            cache_dir = os.path.join(cache_dir, 'profile_' + self.boto_profile)
        if not os.path.exists(cache_dir):
            os.makedirs(cache_dir)

        cache_name = 'ansible-ec2'
        aws_profile = lambda: (self.boto_profile or
                               os.environ.get('AWS_PROFILE') or
                               os.environ.get('AWS_ACCESS_KEY_ID') or
                               self.credentials.get('aws_access_key_id', None))
        if aws_profile():
            cache_name = '%s-%s' % (cache_name, aws_profile())
        self.cache_path_cache = cache_dir + "/%s.cache" % cache_name
        self.cache_path_index = cache_dir + "/%s.index" % cache_name
        self.cache_max_age = config.getint('ec2', 'cache_max_age')

        if config.has_option('ec2', 'expand_csv_tags'):
            self.expand_csv_tags = config.getboolean('ec2', 'expand_csv_tags')
        else:
            self.expand_csv_tags = False

        # 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

        # Replace dash or not in group names
        if config.has_option('ec2', 'replace_dash_in_groups'):
            self.replace_dash_in_groups = config.getboolean('ec2', 'replace_dash_in_groups')
        else:
            self.replace_dash_in_groups = True

        # Configure which groups should be created.
        group_by_options = [
            'group_by_role'
        ]
        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:
            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:
            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'):

            filters = [f for f in config.get('ec2', 'instance_filters').split(',') if f]

            for instance_filter in filters:
                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)')
        parser.add_argument('--profile', '--boto-profile', action='store', dest='boto_profile',
                           help='Use boto profile for connections to EC2')
        self.args = parser.parse_args()


    def do_api_calls_update_cache(self):
        ''' Do API calls to each region, and save data in cache files '''

        for region in self.regions:
            self.get_instances_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, **self.credentials)
            conn.APIVersion = '2010-08-31'
        else:
            conn = self.connect_to_aws(ec2, region)
        return conn

    def boto_fix_security_token_in_profile(self, connect_args):
        ''' monkey patch for boto issue boto/boto#2100 '''
        profile = 'profile ' + self.boto_profile
        if boto.config.has_option(profile, 'aws_security_token'):
            connect_args['security_token'] = boto.config.get(profile, 'aws_security_token')
        return connect_args

    def connect_to_aws(self, module, region):
        connect_args = self.credentials

        # only pass the profile name if it's set (as it is not supported by older boto versions)
        if self.boto_profile:
            connect_args['profile_name'] = self.boto_profile
            self.boto_fix_security_token_in_profile(connect_args)

        conn = module.connect_to_region(region, **connect_args)
        # 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()

            # Pull the tags back in a second step
            # AWS are on record as saying that the tags fetched in the first `get_all_instances` request are not
            # reliable and may be missing, and the only way to guarantee they are there is by calling `get_all_tags`
            instance_ids = []
            for reservation in reservations:
                instance_ids.extend([instance.id for instance in reservation.instances])

            max_filter_value = 199
            tags = []
            for i in range(0, len(instance_ids), max_filter_value):
                tags.extend(conn.get_all_tags(filters={'resource-type': 'instance', 'resource-id': instance_ids[i:i+max_filter_value]}))

            tags_by_instance_id = defaultdict(dict)
            for tag in tags:
                tags_by_instance_id[tag.res_id][tag.name] = tag.value

            for reservation in reservations:
                for instance in reservation.instances:
                    instance.tags = tags_by_instance_id[instance.id]
                    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, 'getting EC2 instances')

    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, err_operation=None):
        '''log an error to std err for ansible-playbook to consume and exit'''
        if err_operation:
            err_msg = 'ERROR: "{err_msg}", while: {err_operation}'.format(
                err_msg=err_msg, err_operation=err_operation)
        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 return instances with desired instance states
        if instance.state not in self.ec2_instance_states:
            return

        # Select the best destination address
        if self.destination_format and self.destination_format_tags:
            dest = self.destination_format.format(*[ getattr(instance, 'tags').get(tag, '') for tag in self.destination_format_tags ])
        elif 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

        # Set the inventory name
        hostname = None
        if self.hostname_variable:
            if self.hostname_variable.startswith('tag_'):
                hostname = instance.tags.get(self.hostname_variable[4:], None)
            else:
                hostname = getattr(instance, self.hostname_variable)

        # If we can't get a nice hostname, use the destination address
        if not hostname:
            hostname = dest
        else:
            hostname = self.to_safe(hostname).lower()

        # 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(hostname):
            return

        # if we need to exclude hosts that match a pattern, skip those
        if self.pattern_exclude and self.pattern_exclude.match(hostname):
            return

        # Add to index
        self.index[hostname] = [region, instance.id]

        # Inventory: Group by tag keys
        if self.group_by_role:
            for k, v in instance.tags.items():
                values = map(lambda x: x.strip(), v.split(','))

                for v in values:
                    if k == "Role" and v:
                        key = self.to_safe(v)
                        self.push(self.inventory, key, hostname)
                        if self.nested_groups:
                            self.push_group(self.inventory, 'tags', self.to_safe(v))

        self.inventory["_meta"]["hostvars"][hostname] = self.get_host_info_dict_from_instance(instance)
        self.inventory["_meta"]["hostvars"][hostname]['ansible_ssh_host'] = dest

    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():
                    if self.expand_csv_tags and ',' in v:
                        v = list(map(lambda x: x.strip(), v.split(',')))
                    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])
            elif key == 'ec2_block_device_mapping':
                instance_vars["ec2_block_devices"] = {}
                for k, v in value.items():
                    instance_vars["ec2_block_devices"][ os.path.basename(k) ] = v.volume_id
            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 '''
        regex = "[^A-Za-z0-9\_"
        if not self.replace_dash_in_groups:
            regex += "\-"
        return re.sub(regex + "]", "_", 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()
