191 lines
7.3 KiB
Python
191 lines
7.3 KiB
Python
#!/usr/bin/env python3
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# MetadataAPIInstance.py - Class implementing an EC2-compatible cloud-init Metadata server
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2020 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program 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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# This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import gevent.pywsgi
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import flask
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import sys
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import time
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import psycopg2
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from threading import Thread
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from psycopg2.extras import RealDictCursor
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import daemon_lib.vm as pvc_vm
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import daemon_lib.network as pvc_network
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class MetadataAPIInstance(object):
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mdapi = flask.Flask(__name__)
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# Initialization function
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def __init__(self, zk_conn, config, logger):
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self.zk_conn = zk_conn
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self.config = config
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self.logger = logger
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self.thread = None
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self.md_http_server = None
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self.add_routes()
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# Add flask routes inside our instance
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def add_routes(self):
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@self.mdapi.route('/', methods=['GET'])
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def api_root():
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return flask.jsonify({"message": "PVC Provisioner Metadata API version 1"}), 209
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@self.mdapi.route('/<version>/meta-data/', methods=['GET'])
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def api_metadata_root(version):
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metadata = """instance-id\nname\nprofile"""
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return metadata, 200
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@self.mdapi.route('/<version>/meta-data/instance-id', methods=['GET'])
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def api_metadata_instanceid(version):
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source_address = flask.request.__dict__['environ']['REMOTE_ADDR']
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vm_details = self.get_vm_details(source_address)
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instance_id = vm_details.get('uuid', None)
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return instance_id, 200
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@self.mdapi.route('/<version>/meta-data/name', methods=['GET'])
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def api_metadata_hostname(version):
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source_address = flask.request.__dict__['environ']['REMOTE_ADDR']
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vm_details = self.get_vm_details(source_address)
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vm_name = vm_details.get('name', None)
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return vm_name, 200
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@self.mdapi.route('/<version>/meta-data/profile', methods=['GET'])
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def api_metadata_profile(version):
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source_address = flask.request.__dict__['environ']['REMOTE_ADDR']
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vm_details = self.get_vm_details(source_address)
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vm_profile = vm_details.get('profile', None)
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return vm_profile, 200
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@self.mdapi.route('/<version>/user-data', methods=['GET'])
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def api_userdata(version):
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source_address = flask.request.__dict__['environ']['REMOTE_ADDR']
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vm_details = self.get_vm_details(source_address)
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vm_profile = vm_details.get('profile', None)
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# Get the userdata
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if vm_profile:
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userdata = self.get_profile_userdata(vm_profile)
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self.logger.out("Returning userdata for profile {}".format(vm_profile), state='i', prefix='Metadata API')
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else:
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userdata = None
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return flask.Response(userdata)
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def launch_wsgi(self):
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try:
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self.md_http_server = gevent.pywsgi.WSGIServer(
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('169.254.169.254', 80),
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self.mdapi,
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log=sys.stdout,
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error_log=sys.stdout
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)
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self.md_http_server.serve_forever()
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except Exception as e:
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self.logger.out('Error starting Metadata API: {}'.format(e), state='e')
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# WSGI start/stop
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def start(self):
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# Launch Metadata API
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self.logger.out('Starting Metadata API at 169.254.169.254:80', state='i')
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self.thread = Thread(target=self.launch_wsgi)
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self.thread.start()
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self.logger.out('Successfully started Metadata API thread', state='o')
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def stop(self):
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if not self.md_http_server:
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return
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self.logger.out('Stopping Metadata API at 169.254.169.254:80', state='i')
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try:
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self.md_http_server.stop()
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time.sleep(0.1)
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self.md_http_server.close()
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time.sleep(0.1)
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self.md_http_server = None
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self.logger.out('Successfully stopped Metadata API', state='o')
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except Exception as e:
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self.logger.out('Error stopping Metadata API: {}'.format(e), state='e')
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# Helper functions
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def open_database(self):
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conn = psycopg2.connect(
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host=self.config['metadata_postgresql_host'],
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port=self.config['metadata_postgresql_port'],
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dbname=self.config['metadata_postgresql_dbname'],
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user=self.config['metadata_postgresql_user'],
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password=self.config['metadata_postgresql_password']
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)
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cur = conn.cursor(cursor_factory=RealDictCursor)
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return conn, cur
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def close_database(self, conn, cur):
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cur.close()
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conn.close()
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# Obtain a list of templates
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def get_profile_userdata(self, vm_profile):
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query = """SELECT userdata.userdata FROM profile
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JOIN userdata ON profile.userdata = userdata.id
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WHERE profile.name = %s;
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"""
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args = (vm_profile,)
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conn, cur = self.open_database()
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cur.execute(query, args)
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data_raw = cur.fetchone()
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self.close_database(conn, cur)
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data = data_raw.get('userdata', None)
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return data
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# VM details function
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def get_vm_details(self, source_address):
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# Start connection to Zookeeper
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_discard, networks = pvc_network.get_list(self.zk_conn, None)
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# Figure out which server this is via the DHCP address
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host_information = dict()
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networks_managed = (x for x in networks if x.get('type') == 'managed')
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for network in networks_managed:
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network_leases = pvc_network.getNetworkDHCPLeases(self.zk_conn, network.get('vni'))
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for network_lease in network_leases:
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information = pvc_network.getDHCPLeaseInformation(self.zk_conn, network.get('vni'), network_lease)
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try:
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if information.get('ip4_address', None) == source_address:
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host_information = information
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except Exception:
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pass
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# Get our real information on the host; now we can start querying about it
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client_macaddr = host_information.get('mac_address', None)
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# Find the VM with that MAC address - we can't assume that the hostname is actually right
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_discard, vm_list = pvc_vm.get_list(self.zk_conn, None, None, None)
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vm_details = dict()
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for vm in vm_list:
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try:
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for network in vm.get('networks'):
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if network.get('mac', None) == client_macaddr:
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vm_details = vm
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except Exception:
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pass
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return vm_details
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