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cloudwatch.py
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cloudwatch.py
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from typing import List, Iterator, Optional
import boto3
import re
from dataclasses import dataclass
from enum import Enum
class AlarmState(Enum):
OK = "OK"
ALARM = "ALARM"
INSUFFICIENT_DATA = "INSUFFICIENT_DATA"
@dataclass
class CloudWatchAlarm:
name: str
arn: str
state: str
@property
def ok(self):
return AlarmState[self.state] == AlarmState.OK
@property
def alarm(self):
return AlarmState[self.state] == AlarmState.ALARM
@property
def insufficient_data(self):
return AlarmState[self.state] == AlarmState.INSUFFICIENT_DATA
@property
def account_id(self) -> str:
return re.search(r"arn:aws:cloudwatch:.*:([0-9]{12}):alarm:.*", self.arn).group(
1
)
@property
def region(self) -> str:
return re.search(r"arn:aws:cloudwatch:(.*):[0-9]{12}:alarm:.*", self.arn).group(
1
)
def __str__(self) -> str:
return f"{self.arn} is in a {self.state} state"
class CloudWatch:
__alarms: List[dict]
def __init__(self):
self.__alarms = []
@staticmethod
def __parse_response(response: Iterator, key: str) -> List[dict]:
def flatten(input_: List[List[dict]]) -> List[dict]:
return [item for sublist in input_ for item in sublist]
def read_iteration(response_: dict) -> Optional[str]:
return response_.get(key)
return flatten(map(read_iteration, response)) # type: ignore
def get_alarms(self, session: boto3.session.Session, region: str) -> None:
client = session.client("cloudwatch", region_name=region)
paginator = client.get_paginator("describe_alarms")
response_iterator = paginator.paginate(PaginationConfig={"PageSize": 100})
self.__alarms.extend(self.__parse_response(response_iterator, "MetricAlarms"))
@property
def alarms(self) -> List[CloudWatchAlarm]:
def resolve(alarm: dict) -> CloudWatchAlarm:
return CloudWatchAlarm(
name=alarm.get("AlarmName", ""),
arn=alarm.get("AlarmArn", ""),
state=alarm.get("StateValue", ""),
)
return list(map(resolve, self.__alarms))