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healthcheck.py
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healthcheck.py
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#!/usr/bin/env python3
# Copyright 2024 Google Inc.
import datetime
import fcntl
import greenstalk
import json
import logging
import os
import time
from google.cloud import compute_v1
PROJECT = 'httparchive'
class Healthcheck(object):
def __init__(self):
self.instances = {}
self.last_update = None
self.root_path = os.path.abspath(os.path.dirname(__file__))
self.instances_file = os.path.join(self.root_path, 'data', 'instances.json')
self.instance_client = compute_v1.InstancesClient()
if os.path.exists(self.instances_file):
with open(self.instances_file, 'rt', encoding='utf-8') as f:
self.instances = json.load(f)
def update_instances(self):
""" Update the authoritative list of running instances """
request = compute_v1.AggregatedListInstancesRequest()
request.project = PROJECT
request.max_results = 500
agg_list = self.instance_client.aggregated_list(request=request)
instances = {}
for zone, response in agg_list:
if response.instances:
for instance in response.instances:
name = instance.name
if name.startswith('agents-'):
try:
timestamp = instance.last_start_timestamp if instance.last_start_timestamp else instance.creation_timestamp
started = datetime.datetime.fromisoformat(timestamp).timestamp()
instances[name] = {'ip': instance.network_interfaces[0].network_i_p,
'zone': os.path.basename(zone),
'started': started}
logging.info('%s - %s (uptime: %d)', instance.name, instance.network_interfaces[0].network_i_p, int(time.time() - started))
except Exception:
pass
# Reconcile the list of instances
delete_names = []
for name in self.instances:
if name not in instances:
delete_names.append(name)
for name in delete_names:
del self.instances[name]
for name in instances:
if name not in self.instances:
self.instances[name] = {}
self.instances[name]['ip'] = instances[name]['ip']
self.instances[name]['zone'] = instances[name]['zone']
self.instances[name]['started'] = instances[name]['started']
def update_alive(self):
logging.info("Updating the last-alive times...")
beanstalk = greenstalk.Client(('127.0.0.1', 11300), encoding=None, watch='alive')
# update the last-alive time for all of the instances
now = time.time()
try:
count = 0
while True:
job = beanstalk.reserve(0)
message = json.loads(job.body.decode())
if 'n' in message and 't' in message:
name = message['n']
last_alive = now
count += 1
if name in self.instances:
self.instances[name]['alive'] = last_alive
if count % 10000 == 0:
logging.info('Processed %d alive updates...', count)
beanstalk.delete(job)
except greenstalk.TimedOutError:
pass
except Exception:
logging.exception("Error checking alive tube")
def terminate_instance(self, name):
try:
instance = self.instances[name]
zone = os.path.basename(instance['zone'])
logging.info('Terminating %s in zone %s ...', name, zone)
self.instance_client.delete(project=PROJECT, zone=zone, instance=name)
except Exception:
logging.exception('Error deleting instance')
def prune_instances(self):
""" Delete any instances that have been running for more than an hour with a last-alive > 30 minutes ago """
now = time.time()
count = 0
for name in self.instances:
instance = self.instances[name]
uptime = now - instance['started']
if uptime > 3600:
elapsed = None
if 'alive' in instance:
elapsed = now - instance['alive']
if elapsed is None or elapsed > 1800:
count += 1
self.terminate_instance(name)
logging.info('Terminated %d instances', count)
def tests_pending(self):
""" See if there are any tests in the crawl queue before checking VMs """
pending = False
try:
beanstalk = greenstalk.Client(('127.0.0.1', 11300))
stats = beanstalk.stats_tube('crawl')
count = stats['current-jobs-ready'] + stats['current-jobs-reserved']
if count > 0:
pending = True
except Exception:
logging.exception("Error checking queue")
return pending
def drain():
logging.info("Draining the last-alive message stragglers...")
beanstalk = greenstalk.Client(('127.0.0.1', 11300), encoding=None, watch='alive')
try:
while True:
job = beanstalk.reserve(0)
beanstalk.delete(job)
except greenstalk.TimedOutError:
pass
except Exception:
logging.exception("Error draining the alive tube")
def run(self):
if self.tests_pending():
self.update_instances()
self.update_alive()
with open(self.instances_file, 'wt', encoding='utf-8') as f:
json.dump(self.instances, f)
self.prune_instances()
else:
logging.info('No tests pending, skipping health check')
self.drain()
# Make sure only one instance is running at a time
lock_handle = None
def run_once():
"""Use a non-blocking lock on the current code file to make sure multiple instance aren't running"""
global lock_handle
try:
lock_handle = open(os.path.realpath(__file__) + '.lock','w')
fcntl.flock(lock_handle, fcntl.LOCK_EX | fcntl.LOCK_NB)
except:
logging.critical('Already running')
os._exit(0)
if __name__ == '__main__':
logging.basicConfig(
level=logging.INFO,
filename='healthcheck.log',
format="%(asctime)s.%(msecs)03d - %(message)s", datefmt="%H:%M:%S")
run_once()
healthcheck = Healthcheck()
try:
healthcheck.run()
except Exception:
logging.exception('Unhandled exception')