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skynet-webportal/setup-scripts/health-checker.py

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2020-09-04 14:12:20 +00:00
#!/usr/bin/env python3
import discord, requests, traceback, asyncio, os, sys, json, io
from datetime import datetime, timedelta
from bot_utils import setup, send_msg, siad, sc_precision
"""
health-checker reads the /health-check endpoint of the portal and dispatches
messages to a Discord channel.
"""
# The default check interval in hours.
DEFAULT_CHECK_INTERVAL = 1
bot_token = setup()
client = discord.Client()
# get_hostname reads the HOSTNAME from the .env file passed as first argument
# to the script
async def get_hostname():
if len(sys.argv) > 1:
env_file = sys.argv[1]
with open(env_file, 'r') as file:
for line in file.read().split('\n'):
pair = line.split("=")
if pair[0] == "HOSTNAME":
return pair[1]
await send_msg(client, "HOSTNAME not found, cannot check health status", force_notify=True)
os.exit(0)
# exit_after kills the script if it hasn't exited on its own after `delay` seconds
async def exit_after(delay):
await asyncio.sleep(delay)
os._exit(0)
@client.event
async def on_ready():
await run_checks()
asyncio.create_task(exit_after(3))
async def run_checks():
print("Running Skynet portal health checks")
try:
await check_health()
except: # catch all exceptions
trace = traceback.format_exc()
print("[DEBUG] run_checks() failed.")
if len(trace) < 1900:
await send_msg(client, "```\n{}\n```".format(trace), force_notify=False)
else:
await send_msg(client, "Failed to run the checks!", file=discord.File(io.BytesIO(trace), filename="failed_checks.log"), force_notify=True)
# check_health checks /health-check endpoint and reports recent issues
async def check_health():
print("\nChecking wallet/funds health...")
try:
hostname = await get_hostname()
res = requests.get("http://"+hostname+"/health-check")
except: # catch all exceptions
trace = traceback.format_exc()
print("[DEBUG] check_health() failed.")
if len(trace) < 1900:
await send_msg(client, "```\n{}\n```".format(trace), force_notify=False)
else:
await send_msg(client, "Failed to run the checks!", file=discord.File(io.BytesIO(trace), filename="failed_checks.log"), force_notify=True)
return
# Get the number of hours to look back in the logs or use 1 as default.
check_hours = DEFAULT_CHECK_INTERVAL
if len(sys.argv) > 3:
check_hours = int(sys.argv[3])
# Check the health records.
failed_checks = []
passed_checks_counter = 0
time_limit = datetime.now() - timedelta(hours=check_hours)
for rec in res.json():
time = datetime.strptime(rec['date'], '%Y-%m-%dT%H:%M:%S.%fZ')
if time < time_limit:
continue
for check in rec['checks']:
if check['up'] == False:
# We append the entire record, so we can get the full context.
failed_checks.append(rec)
break
passed_checks_counter += 1
if len(failed_checks) > 0:
await send_msg(client, "Found {} failed checks over the last {} hours!".format(len(failed_checks), check_hours), file=discord.File(io.BytesIO(json.dumps(failed_checks, indent=2).encode()), filename="failed_checks.log"), force_notify=True)
return
# Send an informational heartbeat if all checks passed.
await send_msg(client, "Health checks passed: {}\n".format(passed_checks_counter))
client.run(bot_token)