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CloudWatchClient,
ListTagsForResourceCommand
} from '@aws-sdk/client-cloudwatch';
import {
PutObjectCommand, S3Client
} from '@aws-sdk/client-s3';
import * as lambda from 'aws-lambda';
import { AlertCategory } from '@/types/backend/alerts';
import {
ALARM_S3_BUCKET, ALARM_S3_KEY, getCachedAlarmData
} from '@/utils/backend/alarmStatus';
import { sendAlertMessage } from '@/utils/backend/texts';
import { getLogger } from '@/utils/common/logger';
import { dateToTimeString } from '@/utils/common/strings';
const logger = getLogger('alarms');
const cloudWatch = new CloudWatchClient();
const s3 = new S3Client();
const minOkayTime = 15 * 60 * 1000; // 15 minutes
export async function main(
event: lambda.CloudWatchAlarmEvent | lambda.EventBridgeEvent<'event', null>
): Promise<void> {
logger.trace('main', ...arguments);
const cachedDataPromise = getCachedAlarmData();
let alarmChange: null | {
name: string;
newState: string;
reason: string;
type: AlertCategory;
} = null;
const nowTime = Date.now();
if ('alarmArn' in event) {
const tags: {
'cofrn-alarm-type': AlertCategory;
[key: string]: string;
} = {
'cofrn-alarm-type': 'Api',
};
try {
const alarmInfo = await cloudWatch.send(new ListTagsForResourceCommand({
ResourceARN: event.alarmArn,
}));
alarmInfo.Tags?.forEach(tag => {
if (
typeof tag.Key === 'undefined' ||
typeof tag.Value === 'undefined'
) {
return;
}
tags[tag.Key] = tag.Value;
});
} catch (e) {
logger.error('main', e);
}
const alarmData = event.alarmData;
const transitionTime = new Date(event.time);
let alertMessage = `Alarm for ${alarmData.alarmName} transitioned from ${alarmData.previousState.value} to ${alarmData.state.value} ${dateToTimeString(transitionTime)}.\n\n`;
if (alarmData.state.value !== 'OK') {
alertMessage += `Impact: ${alarmData.configuration.description}\n\n`;
}
alertMessage += `Reason For Change: ${alarmData.state.reason}`;
alarmChange = {
name: alarmData.alarmName,
newState: alarmData.state.value,
reason: alertMessage,
type: tags['cofrn-alarm-type'],
};
}
const cachedData = await cachedDataPromise;
let cacheChanged = false;
// Send a net new alarm
if (alarmChange) {
cachedData[alarmChange.name] = cachedData[alarmChange.name] || {
type: alarmChange.type,
};
const alarmCacheData = cachedData[alarmChange.name];
alarmCacheData.lastReason = alarmChange.reason;
switch (alarmChange.newState) {
case 'OK':
alarmCacheData.lastOk = nowTime;
break;
case 'ALARM':
if (
typeof alarmCacheData.lastAlarm === 'undefined' ||
(
alarmCacheData.lastOk &&
alarmCacheData.lastOkSent &&
alarmCacheData.lastOkSent > alarmCacheData.lastOk
)
) {
await sendAlertMessage(alarmChange.type, alarmChange.reason);
}
alarmCacheData.lastAlarm = nowTime;
break;
}
cacheChanged = true;
}
// Send the okay messages if enough time has elapsed
await Promise.all(Object.keys(cachedData)
.map(alarmName => {
const alarmData = cachedData[alarmName];
if (
!alarmData.lastOk ||
(
alarmData.lastAlarm &&
alarmData.lastOk < alarmData.lastAlarm
) ||
alarmData.lastOk > nowTime - minOkayTime ||
!alarmData.lastReason ||
(
alarmData.lastOkSent &&
alarmData.lastOkSent > alarmData.lastOk
)
) {
return;
}
alarmData.lastOkSent = nowTime;
cacheChanged = true;
return sendAlertMessage(alarmData.type, alarmData.lastReason);
}));
if (cacheChanged) {
await s3.send(new PutObjectCommand({
Bucket: ALARM_S3_BUCKET,
Key: ALARM_S3_KEY,
Body: JSON.stringify(cachedData),
}));
}
}
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