cloudstack: new module cs_facts
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Rene Moser
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cloud/cloudstack/cs_facts.py
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cloud/cloudstack/cs_facts.py
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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#
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# (c) 2015, René Moser <mail@renemoser.net>
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#
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# This file is part of Ansible
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#
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# Ansible is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# Ansible is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with Ansible. If not, see <http://www.gnu.org/licenses/>.
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DOCUMENTATION = '''
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---
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module: cs_facts
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short_description: Gather facts on instances of Apache CloudStack based clouds.
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description:
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- This module fetches data from the metadata API in CloudStack. The module must be called from within the instance itself.
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version_added: '2.0'
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author: "René Moser (@resmo)"
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options:
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filter:
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description:
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- Filter for a specific fact.
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required: false
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default: null
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choices:
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- cloudstack_service_offering
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- cloudstack_availability_zone
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- cloudstack_public_hostname
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- cloudstack_public_ipv4
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- cloudstack_local_hostname
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- cloudstack_local_ipv4
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- cloudstack_instance_id
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- cloudstack_user_data
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requirements: [ 'yaml' ]
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'''
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EXAMPLES = '''
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# Gather all facts on instances
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- name: Gather cloudstack facts
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cs_facts:
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# Gather specific fact on instances
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- name: Gather cloudstack facts
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cs_facts: filter=cloudstack_instance_id
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'''
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RETURN = '''
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---
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cloudstack_availability_zone:
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description: zone the instance is deployed in.
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returned: success
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type: string
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sample: ch-gva-2
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cloudstack_instance_id:
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description: UUID of the instance.
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returned: success
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type: string
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sample: ab4e80b0-3e7e-4936-bdc5-e334ba5b0139
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cloudstack_local_hostname:
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description: local hostname of the instance.
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returned: success
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type: string
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sample: VM-ab4e80b0-3e7e-4936-bdc5-e334ba5b0139
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cloudstack_local_ipv4:
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description: local IPv4 of the instance.
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returned: success
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type: string
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sample: 185.19.28.35
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cloudstack_public_hostname:
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description: public hostname of the instance.
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returned: success
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type: string
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sample: VM-ab4e80b0-3e7e-4936-bdc5-e334ba5b0139
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cloudstack_public_ipv4:
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description: public IPv4 of the instance.
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returned: success
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type: string
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sample: 185.19.28.35
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cloudstack_service_offering:
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description: service offering of the instance.
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returned: success
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type: string
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sample: Micro 512mb 1cpu
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cloudstack_user_data:
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description: data of the instance provided by users.
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returned: success
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type: dict
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sample: { "bla": "foo" }
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'''
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import os
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try:
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import yaml
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has_lib_yaml = True
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except ImportError:
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has_lib_yaml = False
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CS_METADATA_BASE_URL = "http://%s/latest/meta-data"
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CS_USERDATA_BASE_URL = "http://%s/latest/user-data"
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class CloudStackFacts(object):
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def __init__(self):
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self.facts = ansible_facts(module)
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self.api_ip = None
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self.fact_paths = {
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'cloudstack_service_offering': 'service-offering',
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'cloudstack_availability_zone': 'availability-zone',
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'cloudstack_public_hostname': 'public-hostname',
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'cloudstack_public_ipv4': 'public-ipv4',
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'cloudstack_local_hostname': 'local-hostname',
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'cloudstack_local_ipv4': 'local-ipv4',
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'cloudstack_instance_id': 'instance-id'
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}
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def run(self):
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result = {}
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filter = module.params.get('filter')
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if not filter:
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for key,path in self.fact_paths.iteritems():
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result[key] = self._fetch(CS_METADATA_BASE_URL + "/" + path)
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result['cloudstack_user_data'] = self._get_user_data_json()
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else:
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if filter == 'cloudstack_user_data':
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result['cloudstack_user_data'] = self._get_user_data_json()
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elif filter in self.fact_paths:
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result[filter] = self._fetch(CS_METADATA_BASE_URL + "/" + self.fact_paths[filter])
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return result
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def _get_user_data_json(self):
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try:
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# this data come form users, we try what we can to parse it...
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return yaml.load(self._fetch(CS_USERDATA_BASE_URL))
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except:
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return None
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def _fetch(self, path):
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api_ip = self._get_api_ip()
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if not api_ip:
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return None
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api_url = path % api_ip
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(response, info) = fetch_url(module, api_url, force=True)
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if response:
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data = response.read()
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else:
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data = None
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return data
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def _get_dhcp_lease_file(self):
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"""Return the path of the lease file."""
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default_iface = self.facts['default_ipv4']['interface']
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dhcp_lease_file_locations = [
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'/var/lib/dhcp/dhclient.%s.leases' % default_iface, # debian / ubuntu
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'/var/lib/dhclient/dhclient-%s.leases' % default_iface, # centos 6
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'/var/lib/dhclient/dhclient--%s.lease' % default_iface, # centos 7
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'/var/db/dhclient.leases.%s' % default_iface, # openbsd
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]
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for file_path in dhcp_lease_file_locations:
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if os.path.exists(file_path):
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return file_path
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module.fail_json(msg="Could not find dhclient leases file.")
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def _get_api_ip(self):
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"""Return the IP of the DHCP server."""
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if not self.api_ip:
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dhcp_lease_file = self._get_dhcp_lease_file()
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for line in open(dhcp_lease_file):
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if 'dhcp-server-identifier' in line:
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# get IP of string "option dhcp-server-identifier 185.19.28.176;"
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line = line.translate(None, ';')
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self.api_ip = line.split()[2]
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break
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if not self.api_ip:
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module.fail_json(msg="No dhcp-server-identifier found in leases file.")
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return self.api_ip
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def main():
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global module
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module = AnsibleModule(
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argument_spec = dict(
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filter = dict(default=None, choices=[
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'cloudstack_service_offering',
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'cloudstack_availability_zone',
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'cloudstack_public_hostname',
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'cloudstack_public_ipv4',
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'cloudstack_local_hostname',
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'cloudstack_local_ipv4',
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'cloudstack_instance_id',
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'cloudstack_user_data',
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]),
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),
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supports_check_mode=False
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)
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if not has_lib_yaml:
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module.fail_json(msg="missing python library: yaml")
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cs_facts = CloudStackFacts().run()
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cs_facts_result = dict(changed=False, ansible_facts=cs_facts)
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module.exit_json(**cs_facts_result)
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from ansible.module_utils.basic import *
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from ansible.module_utils.urls import *
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from ansible.module_utils.facts import *
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main()
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