169 lines
6.2 KiB
Python
Executable File
169 lines
6.2 KiB
Python
Executable File
#!/usr/bin/env python3
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import asyncio
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import io
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import json
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import os
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import re
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import sys
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import traceback
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from datetime import datetime, timedelta
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import discord
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import pytz.reference
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import requests
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from bot_utils import setup, send_msg
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from tzlocal import get_localzone
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"""
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health-checker reads the /health-check endpoint of the portal and dispatches
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messages to a Discord channel.
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"""
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# Get the number of hours to look back in the logs or use 1 as default.
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CHECK_HOURS = 1
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if len(sys.argv) > 3:
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CHECK_HOURS = int(sys.argv[3])
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# Discord messages have a limit on their length set at 2000 bytes. We use
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# a lower limit in order to leave some space for additional message text.
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DISCORD_MAX_MESSAGE_LENGTH = 1900
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GB = 1 << 30 # 1 GiB in bytes
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# We are going to issue Discord warnings if the free space on a server falls
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# under this threshold.
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FREE_DISK_SPACE_THRESHOLD = 50 * GB
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bot_token = setup()
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client = discord.Client()
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# exit_after kills the script if it hasn't exited on its own after `delay` seconds
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async def exit_after(delay):
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await asyncio.sleep(delay)
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os._exit(0)
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@client.event
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async def on_ready():
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await run_checks()
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asyncio.create_task(exit_after(3))
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async def run_checks():
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print("Running Skynet portal health checks")
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try:
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await check_load_average()
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await check_disk()
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# await check_health() # FIXME: adjust it to work with https://github.com/NebulousLabs/skynet-webportal/pull/389
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except:
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trace = traceback.format_exc()
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print("[DEBUG] run_checks() failed.")
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if len(trace) < DISCORD_MAX_MESSAGE_LENGTH:
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await send_msg(client, "```\n{}\n```".format(trace), force_notify=False)
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else:
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await send_msg(client, "Failed to run the portal health checks!",
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file=discord.File(io.BytesIO(trace.encode()), filename="failed_checks.log"),
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force_notify=True)
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# check_load_average monitors the system's load average value and issues a
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# warning message if it exceeds 10.
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async def check_load_average():
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uptime_string = os.popen("uptime").read().strip()
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if sys.platform == "Darwin":
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pattern = "^.*load averages: \d*\.\d* \d*\.\d* (\d*\.\d*)$"
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else:
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pattern = "^.*load average: \d*\.\d*, \d*\.\d*, (\d*\.\d*)$"
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load_av = re.match(pattern, uptime_string).group(1)
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if float(load_av) > 10:
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await send_msg(client, "High system load detected: `uptime: {}`".format(uptime_string), force_notify=True)
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# check_disk checks the amount of free space on the /home partition and issues
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# a warning message if it's under FREE_DISK_SPACE_THRESHOLD GB.
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async def check_disk():
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# We check free disk space in 1024 byte units, so it's easy to convert.
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df = os.popen("df --block-size=1024").read().strip()
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volumes = {}
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for line in df.split("\n")[1:]:
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fields = list(filter(None, line.split(" ")))
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# -1 is "mounted on", 3 is "available space" in KiB which we want in bytes
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volumes[fields[-1]] = fields[3] * 1024
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# List of mount point, longest to shortest. We'll use that to find the best
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# fit for the volume we want to check.
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mount_points = sorted(volumes.keys(), key=len, reverse=True)
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wd = os.popen("pwd").read().strip()
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vol = ""
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for mp in mount_points:
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if wd.startswith(mp):
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vol = mp
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break
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if vol == "":
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msg = "Failed to check free disk space! Didn't find a suitable mount point to check.\ndf output:\n{}".format(df)
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await send_msg(client, msg)
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return
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if int(volumes[vol]) < FREE_DISK_SPACE_THRESHOLD:
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free_space_gb = "{:.2f}".format(int(volumes[vol]) / GB)
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await send_msg(client, "WARNING! Low disk space: {}GiB".format(free_space_gb), force_notify=True)
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return
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# check_health checks /health-check endpoint and reports recent issues
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async def check_health():
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print("\nChecking portal health status...")
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try:
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res = requests.get("http://localhost/health-check", verify=False)
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except:
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trace = traceback.format_exc()
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print("[DEBUG] check_health() failed.")
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if len(trace) < DISCORD_MAX_MESSAGE_LENGTH:
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await send_msg(client, "```\n{}\n```".format(trace), force_notify=False)
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else:
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await send_msg(client, "Failed to run the checks!",
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file=discord.File(io.BytesIO(trace.encode()), filename="failed_checks.log"),
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force_notify=True)
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return
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# Check the health records.
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passed_checks = 0
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failed_checks = 0
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failed_critical = 0
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failed_records = []
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time_limit_unaware = datetime.now() - timedelta(hours=CHECK_HOURS) # local time
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time_limit = time_limit_unaware.astimezone(get_localzone()) # time with time zone
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for rec in res.json():
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time_unaware = datetime.strptime(rec['date'], '%Y-%m-%dT%H:%M:%S.%fZ') # time in UTC
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time = pytz.utc.localize(time_unaware) # time with time zone
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if time < time_limit:
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continue
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bad = False
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for check in rec['checks']:
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if check['up'] == False:
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bad = True
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failed_checks += 1
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if check['critical']:
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failed_critical += 1
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if bad:
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# We append the entire record, so we can get the full context.
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failed_records.append(rec)
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passed_checks += 1
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checks = passed_checks + failed_checks
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if len(failed_records) > 0:
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message = "Found {}/{} failed checks ({} critical) over the last {} hours!".format(failed_checks, checks,
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failed_critical, CHECK_HOURS)
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file = discord.File(io.BytesIO(json.dumps(failed_records, indent=2).encode()), filename="failed_checks.log")
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notifyTeam = failed_critical > 0
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await send_msg(client, message, file=file, force_notify=notifyTeam)
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return
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# Send an informational heartbeat if all checks passed but only if it's in
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# the first CHECK_HOURS hours of the day, essentially the first call.
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if datetime.now().hour < CHECK_HOURS:
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await send_msg(client, "Health checks passed: {}/{}\n".format(passed_checks, checks))
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client.run(bot_token)
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