为什么我在 CloudWatch 和 lambda function 的控制台中看不到我的日志？

Question

I have lambda function, but I don't see my log at the console.log in CloudWatch. what is missing here?

'use strict';
exports.handler = (event, context, callback) => {
    
    //Get contents of response
    const response = event.Records[0].cf.response;
    const headers = response.headers;

//Set new headers 
 headers['strict-transport-security'] = [{key: 'Strict-Transport-Security', value: 'max-age=63072000; includeSubdomains; preload'}]; 
 headers['content-security-policy'] = [{key: 'Content-Security-Policy', value: "default-src 'none'; img-src 'self'; script-src 'self'; style-src 'self'; object-src 'none'"}]; 
 headers['x-content-type-options'] = [{key: 'X-Content-Type-Options', value: 'nosniff'}]; 
 headers['x-frame-options'] = [{key: 'X-Frame-Options', value: 'DENY'}]; 
 headers['x-xss-protection'] = [{key: 'X-XSS-Protection', value: '1; mode=block'}]; 
 headers['referrer-policy'] = [{key: 'Referrer-Policy', value: 'same-origin'}]; 
 
 console.log('in handler');
 
 console.log({ xx: event.Records[0].cf.request.uri });
    
 console.log('end handler ');
 
    //Return modified response
    callback(null, response);
};

https://console.aws.amazon.com/cloudwatch/home?region=us-east-1

CloudWatch:

Lambda Test:

Answer 1

From the behaviour you're experiencing I suspect this is simply that a new version of the Lambda@Edge has not been deployed to the CloudFront distribution.

Whenever you need to release an update of the code you must create a new version of the Lambda function and then replace the Lambda event in your CloudFront distribution to use the new version record.

Once this happens it will take a short while to modify in every edge location so you might not immediately see these debug lines in your logs.

As this process takes time to deploy, make sure to make use of the test events (as input to your Lambda) to test the scenarios that need to be tested once the Lambda is deployed. Once you're happy with it perform the new version and deploy.

For more information take a look at the Editing a Lambda Function for Lambda@Edge page.