Generic libcloud script for ansible inventory

plugins/inventory/apache-libcloud.py

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+#!/usr/bin/env python
+
+# (c) 2013, Sebastien Goasguen <runseb@gmail.com>
+#
+# 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/>.
+
+######################################################################
+
+'''
+Apache Libcloud generic external inventory script
+=================================
+
+Generates inventory that Ansible can understand by making API request to
+Cloud providers using the Apache libcloud library.
+
+This script also assumes there is a libcloud.ini file alongside it
+
+'''
+
+import sys
+import os
+import argparse
+import re
+from time import time
+import ConfigParser
+
+from libcloud.compute.types import Provider
+from libcloud.compute.providers import get_driver
+import libcloud.security as sec
+
+try:
+    import json
+except ImportError:
+    import simplejson as json
+
+
+class LibcloudInventory(object):
+    def __init__(self):
+        ''' Main execution path '''
+
+        # Inventory grouped by instance IDs, tags, security groups, regions,
+        # and availability zones
+        self.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 len(self.inventory) == 0:
+                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 libcloud.ini file '''
+
+        config = ConfigParser.SafeConfigParser()
+        libcloud_default_ini_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), 'libcloud.ini')
+        libcloud_ini_path = os.environ.get('LIBCLOUD_INI_PATH', libcloud_default_ini_path)
+        config.read(libcloud_ini_path)
+
+        if not config.has_section('driver'):
+            raise ValueError('libcloud.ini file must contain a [driver] section')
+
+        if config.has_option('driver', 'provider'):
+            self.provider = config.get('driver','provider')
+        else:
+            raise ValueError('libcloud.ini does not have a provider defined')
+
+        if config.has_option('driver', 'key'):
+            self.key = config.get('driver','key')
+        else:
+            raise ValueError('libcloud.ini does not have a key defined')
+
+        if config.has_option('driver', 'secret'):
+            self.secret = config.get('driver','secret')
+        else:
+            raise ValueError('libcloud.ini does not have a secret defined')
+
+        if config.has_option('driver', 'host'):
+            self.host = config.get('driver', 'host')
+        if config.has_option('driver', 'secure'):
+            self.secure = config.get('driver', 'secure')
+        if config.has_option('driver', 'verify_ssl_cert'):
+            self.verify_ssl_cert = config.get('driver', 'verify_ssl_cert')
+        if config.has_option('driver', 'port'):
+            self.port = config.get('driver', 'port')
+        if config.has_option('driver', 'path'):
+            self.path = config.get('driver', 'path')
+        if config.has_option('driver', 'api_version'):
+            self.api_version = config.get('driver', 'api_version')    
+
+        Driver = get_driver(getattr(Provider, self.provider))
+
+        self.conn = Driver(key=self.key, secret=self.secret, secure=self.secure,
+                           host=self.host, path=self.path)
+
+        # Cache related
+        cache_path = config.get('cache', 'cache_path')
+        self.cache_path_cache = cache_path + "/ansible-libcloud.cache"
+        self.cache_path_index = cache_path + "/ansible-libcloud.index"
+        self.cache_max_age = config.getint('cache', 'cache_max_age')
+        
+
+    def parse_cli_args(self):
+        '''
+        Command line argument processing
+        '''
+
+        parser = argparse.ArgumentParser(description='Produce an Ansible Inventory file based on libcloud supported providers')
+        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 libcloud supported providers (default: False - use cache files)')
+        self.args = parser.parse_args()
+
+
+    def do_api_calls_update_cache(self):
+        ''' 
+        Do API calls to a location, and save data in cache files 
+        '''
+
+        self.get_nodes()
+
+        self.write_to_cache(self.inventory, self.cache_path_cache)
+        self.write_to_cache(self.index, self.cache_path_index)
+
+
+    def get_nodes(self):
+        '''
+        Gets the list of all nodes
+        '''
+
+        for node in self.conn.list_nodes():
+            self.add_node(node)
+
+
+    def get_node(self, node_id):
+        '''
+        Gets details about a specific node
+        '''
+
+        return [node for node in self.conn.list_nodes() if node.id == node_id][0]
+
+
+    def add_node(self, node):
+        '''
+        Adds a node to the inventory and index, as long as it is
+        addressable 
+        '''
+
+        # Only want running instances
+        if node.state != 0:
+            return
+
+        # Select the best destination address
+        if not node.public_ips == []:
+            dest = node.public_ips[0]
+        if not dest:
+            # Skip instances we cannot address (e.g. private VPC subnet)
+            return
+
+        # Add to index
+        self.index[dest] = node.name
+
+        # Inventory: Group by instance ID (always a group of 1)
+        self.inventory[node.name] = [dest]
+        '''
+        # Inventory: Group by region
+        self.push(self.inventory, region, dest)
+
+        # Inventory: Group by availability zone
+        self.push(self.inventory, node.placement, dest)
+
+        # Inventory: Group by instance type
+        self.push(self.inventory, self.to_safe('type_' + node.instance_type), dest)
+        '''
+        # Inventory: Group by key pair
+        if node.extra['keyname']:
+            self.push(self.inventory, self.to_safe('key_' + node.extra['keyname']), dest)
+            
+        # Inventory: Group by security group, quick thing to handle single sg
+        if node.extra['securitygroup']:
+            self.push(self.inventory, self.to_safe('sg_' + node.extra['securitygroup'][0]), dest)
+
+    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 migh not exist anymore
+                return self.json_format_dict({}, True)
+
+        node_id = self.index[self.args.host]
+
+        node = self.get_node(node_id)
+        instance_vars = {}
+        for key in vars(instance):
+            value = getattr(instance, key)
+            key = self.to_safe('ec2_' + key)
+
+            # Handle complex types
+            if type(value) in [int, bool]:
+                instance_vars[key] = value
+            elif type(value) in [str, unicode]:
+                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_tags':
+                for k, v in value.iteritems():
+                    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(group_ids)
+                instance_vars["ec2_security_group_names"] = ','.join(group_names)
+            else:
+                pass
+                # TODO Product codes if someone finds them useful
+                #print key
+                #print type(value)
+                #print value
+
+        return self.json_format_dict(instance_vars, True)
+
+
+    def push(self, my_dict, key, element):
+        '''
+        Pushed an element onto an array that may not have been defined in
+        the dict
+        '''
+
+        if key in my_dict:
+            my_dict[key].append(element);
+        else:
+            my_dict[key] = [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 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)
+
+def main():
+    LibcloudInventory()
+
+if __name__ == '__main__':
+	main()

plugins/inventory/libcloud.ini

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+# Ansible Apache Libcloud Generic inventory script
+
+[driver]
+provider = CLOUDSTACK
+host = 
+path = 
+secure = True
+verify_ssl_cert = True
+
+key = 
+secret = 
+
+[cache]
+cache_path=/path/to/your/cache
+cache_max_age=60