pvc/node-daemon/pvcnoded/objects/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) 2018-2022 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, version 3.
#
# 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, zkhandler, config, logger):
self.zkhandler = zkhandler
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)
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if data_raw is not None:
data = data_raw.get("userdata", None)
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return data
else:
return None
# VM details function
def get_vm_details(self, source_address):
# Start connection to Zookeeper
_discard, networks = pvc_network.get_list(self.zkhandler, 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.zkhandler, network.get("vni")
)
for network_lease in network_leases:
information = pvc_network.getDHCPLeaseInformation(
self.zkhandler, 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.zkhandler, None, 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