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metric.ts
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metric.ts
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import { Metrics, MetricUnits } from '@aws-lambda-powertools/metrics';
import { randomUUID } from 'crypto';
// Mocked AWS API Gateway event, see: https://docs.aws.amazon.com/lambda/latest/dg/services-apigateway.html
const event = {
resource: '/',
path: '/',
httpMethod: 'GET',
headers: {
accept:
'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
'accept-encoding': 'gzip, deflate, br',
'accept-language': 'en-US,en;q=0.9',
'CloudFront-Viewer-Country': 'SE',
'User-Agent':
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36',
'X-Amzn-Trace-Id': 'Root=1-5e66d96f-7491f09xmpl79d18acf3d050',
'X-Forwarded-For': '192.168.0.1',
'X-Forwarded-Port': '443',
'X-Forwarded-Proto': 'https'
},
multiValueHeaders: {},
queryStringParameters: null,
multiValueQueryStringParameters: null,
pathParameters: null,
stageVariables: null,
requestContext: {
resourceId: '2gxmpl',
resourcePath: '/',
httpMethod: 'GET',
extendedRequestId: 'JJbxmplHYosFVYQ=',
requestTime: '10/Mar/2020:00:03:59 +0000',
path: '/prod/',
accountId: '123456789012',
protocol: 'HTTP/1.1',
stage: 'prod',
domainPrefix: '70ixmpl4fl',
requestTimeEpoch: 1583798639428,
requestId: '77375676-xmpl-4b79-853a-f982474efe18',
identity: {
cognitoIdentityPoolId: null,
accountId: null,
cognitoIdentityId: null,
caller: null,
sourceIp: '192.168.0.1',
principalOrgId: null,
accessKey: null,
cognitoAuthenticationType: null,
cognitoAuthenticationProvider: null,
userArn: null,
userAgent:
'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.132 Safari/537.36',
user: null
},
domainName: '70ixmpl4fl.execute-api.us-east-2.amazonaws.com',
apiId: '70ixmpl4fl'
},
body: null,
isBase64Encoded: false
};
// Mocked AWS API Gateway context
const context = {
callbackWaitsForEmptyEventLoop: {},
succeed: {},
fail: {},
done: {},
functionVersion: '$LATEST',
functionName: 'somestack-FunctionName',
memoryLimitInMB: '1024',
logGroupName: '/aws/lambda/somestack-FunctionName',
logStreamName: '2022/07/09/[$LATEST]159282acddb84ca0bc0d5f325ea01343',
clientContext: '',
identity: '',
invokedFunctionArn: 'arn:aws:lambda:eu-north-1:123412341234:function:somestack-FunctionName',
awsRequestId: '6c933bd2-9535-45a8-b09c-84d00b4f50cc',
getRemainingTimeInMillis: {}
};
export const handler = async (context: any): Promise<void> => {
// Static metadata
const staticMetadata = {
dataSensitivity: 'public',
domain: 'CustomerAcquisition',
hostPlatform: 'aws',
jurisdiction: 'EU',
owner: 'MyCompany',
service: 'UserSignUp',
system: 'ShowroomActivities',
tags: ['typescript', 'backend'],
team: 'MyDemoTeam'
};
// Dynamic metadata from environment
const dynamicMetadata = {
accountId: event.requestContext.accountId,
correlationId: context.awsRequestId, // This is rudimentary and should also check for ID coming through headers etc!
functionMemorySize: process.env.AWS_LAMBDA_FUNCTION_MEMORY_SIZE || context.memoryLimitInMB,
functionName: process.env.AWS_LAMBDA_FUNCTION_NAME || context.functionName,
functionVersion: process.env.AWS_LAMBDA_FUNCTION_VERSION || context.functionVersion,
region: process.env.AWS_REGION || 'UNKNOWN',
resource: event.path, // This case is only valid for HTTP not for EventBridge etc!
runtime: process.env.AWS_EXECUTION_ENV || 'UNKNOWN',
stage: event.requestContext.stage,
timestampRequest: event.requestContext.requestTimeEpoch.toString(),
user: event.requestContext.identity.user,
viewerCountry: event.headers['CloudFront-Viewer-Country'] // This may or may not be present
};
const metrics = new Metrics({
namespace: 'MyNamespace',
serviceName: staticMetadata.service
});
// Add metrics and dimensions as per use case
metrics.addMetric('duration', MetricUnits.Milliseconds, 83);
metrics.addDimension('user', 'Name');
// Add metadata as per use case
metrics.addMetadata('user', 'Sam Person');
metrics.addMetadata('duration', '83');
metrics.addMetadata('correlationId', '8d5a0ba6-05e0-4c9b-bc7c-9164ea1bdedd');
const addMetadata = (metadata: any) => {
const [key, value] = metadata;
metrics.addMetadata(key, value);
};
const time = Date.now();
const requiredMetadata = {
correlationId: event.requestContext.requestId,
id: randomUUID(),
timestamp: new Date(time).toISOString(),
timestampEpoch: `${time}`
};
Object.entries(dynamicMetadata).forEach((metadata: any) => addMetadata(metadata));
Object.entries(staticMetadata).forEach((metadata: any) => addMetadata(metadata));
Object.entries(requiredMetadata).forEach((metadata: any) => addMetadata(metadata));
// Publish metric
metrics.publishStoredMetrics();
};
// Run - skip event in this example
handler(context);