pvc/node-daemon/pvcnoded/MetadataAPIInstance.py

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