230 lines
8 KiB
Python
230 lines
8 KiB
Python
import logging
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from typing import List
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import pytimeparse2
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from diskcache import Cache
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from nio import AsyncClient, MatrixRoom
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from matrix_alertbot.alertmanager import AlertmanagerClient
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from matrix_alertbot.chat_functions import send_text_to_room
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from matrix_alertbot.config import Config
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from matrix_alertbot.errors import (
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AlertmanagerError,
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AlertNotFoundError,
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SilenceNotFoundError,
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)
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from matrix_alertbot.matcher import AlertMatcher, AlertRegexMatcher
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logger = logging.getLogger(__name__)
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class Command:
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def __init__(
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self,
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client: AsyncClient,
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cache: Cache,
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alertmanager: AlertmanagerClient,
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config: Config,
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command: str,
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room: MatrixRoom,
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sender: str,
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event_id: str,
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):
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"""A command made by a user.
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Args:
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client: The client to communicate to matrix with.
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cache: Bot cache.
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config: Bot configuration parameters.
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command: The command and arguments.
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room: The room the command was sent in.
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event: The event describing the command.
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"""
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self.client = client
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self.cache = cache
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self.alertmanager = alertmanager
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self.config = config
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self.command = command
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self.room = room
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self.sender = sender
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self.event_id = event_id
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self.args = self.command.split()[1:]
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async def process(self) -> None:
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"""Process the command"""
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if self.command.startswith("ack"):
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await self._ack()
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elif self.command.startswith("unack") or self.command.startswith("nack"):
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await self._unack()
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elif self.command.startswith("help"):
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await self._show_help()
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else:
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await self._unknown_command()
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async def _ack(self) -> None:
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"""Acknowledge an alert and silence it for a certain duration in Alertmanager"""
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matchers: List[AlertMatcher] = []
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durations = []
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for arg in self.args:
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if "=~" in arg:
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label, regex = arg.split("=~")
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regex_matcher = AlertRegexMatcher(label, regex)
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matchers.append(regex_matcher)
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elif "=" in arg:
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label, value = arg.split("=")
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matcher = AlertMatcher(label, value)
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matchers.append(matcher)
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else:
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durations.append(arg)
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if len(durations) > 0:
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duration = " ".join(durations)
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else:
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duration = "1d"
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logger.debug(
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f"Receiving a command to create a silence for a duration of {duration}"
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)
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duration_seconds = pytimeparse2.parse(duration)
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if duration_seconds is None:
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logger.error(f"Unable to create silence: Invalid duration '{duration}'")
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await send_text_to_room(
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self.client,
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self.room.room_id,
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f"I tried really hard, but I can't convert this duration to a number of seconds: {duration}.",
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)
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return
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logger.debug(f"Read alert fingerprints for event {self.event_id} from cache")
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if self.event_id not in self.cache:
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logger.error(f"Cannot find fingerprints for event {self.event_id} in cache")
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return
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alert_fingerprints = self.cache[self.event_id]
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logger.debug(f"Found {len(alert_fingerprints)} in cache")
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count_alert_not_found = 0
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count_created_silences = 0
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for alert_fingerprint in alert_fingerprints:
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logger.debug(
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f"Create silence for alert with fingerprint {alert_fingerprint} for a duration of {duration}"
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)
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try:
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await self.alertmanager.create_silence(
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alert_fingerprint,
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duration_seconds,
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self.room.user_name(self.sender),
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matchers,
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)
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count_created_silences += 1
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except AlertNotFoundError as e:
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logger.warning(f"Unable to create silence: {e}")
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count_alert_not_found += 1
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except AlertmanagerError as e:
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logger.exception(f"Unable to create silence: {e}", exc_info=e)
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if count_alert_not_found > 0:
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await send_text_to_room(
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self.client,
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self.room.room_id,
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f"Sorry, I couldn't find {count_alert_not_found} alerts, therefore I couldn't create their silence.",
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)
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if count_created_silences > 0:
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await send_text_to_room(
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self.client,
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self.room.room_id,
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f"Created {count_created_silences} silences with a duration of {duration}.",
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)
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async def _unack(self) -> None:
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"""Delete an alert's acknowledgement of an alert and remove corresponding silence in Alertmanager"""
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matchers: List[AlertMatcher] = []
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for arg in self.args:
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if "=~" in arg:
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label, regex = arg.split("=~")
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regex_matcher = AlertRegexMatcher(label, regex)
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matchers.append(regex_matcher)
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elif "=" in arg:
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label, value = arg.split("=")
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matcher = AlertMatcher(label, value)
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matchers.append(matcher)
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logger.debug("Receiving a command to delete a silence")
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logger.debug(f"Read alert fingerprints for event {self.event_id} from cache")
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if self.event_id not in self.cache:
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logger.error(f"Cannot find fingerprints for event {self.event_id} in cache")
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return
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alert_fingerprints = self.cache[self.event_id]
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logger.debug(f"Found {len(alert_fingerprints)} in cache")
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count_alert_not_found = 0
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count_removed_silences = 0
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for alert_fingerprint in alert_fingerprints:
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logger.debug(
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f"Delete silence for alert with fingerprint {alert_fingerprint}"
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)
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try:
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removed_silences = await self.alertmanager.delete_silences(
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alert_fingerprint, matchers
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)
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count_removed_silences += len(removed_silences)
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except (AlertNotFoundError, SilenceNotFoundError) as e:
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logger.error(f"Unable to delete silence: {e}")
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count_alert_not_found += 1
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except AlertmanagerError as e:
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logger.exception(f"Unable to delete silence: {e}", exc_info=e)
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if count_alert_not_found > 0:
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await send_text_to_room(
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self.client,
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self.room.room_id,
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f"Sorry, I couldn't find {count_alert_not_found} alerts, therefore I couldn't remove their silences.",
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)
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if count_removed_silences > 0:
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await send_text_to_room(
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self.client,
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self.room.room_id,
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f"Removed {count_removed_silences} silences.",
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)
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async def _show_help(self) -> None:
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"""Show the help text"""
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logger.debug(f"Displaying help to room {self.room.display_name}")
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if not self.args:
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text = (
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"Hello, I am a bot made with matrix-nio! Use `help commands` to view "
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"available commands."
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)
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await send_text_to_room(self.client, self.room.room_id, text)
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return
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topic = self.args[0]
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if topic == "rules":
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text = "These are the rules!"
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elif topic == "commands":
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text = "Available commands: ..."
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else:
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text = "Unknown help topic!"
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await send_text_to_room(self.client, self.room.room_id, text)
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async def _unknown_command(self) -> None:
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logger.debug(
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f"Sending unknown command response to room {self.room.display_name}"
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)
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await send_text_to_room(
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self.client,
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self.room.room_id,
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f"Unknown command '{self.command}'. Try the 'help' command for more information.",
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)
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