(CLI): watch logs always end with the 'truncated' message

[skinny85]

What is the problem?

When using cdk watch, the logs always end with:

[/aws/lambda/HackathonExampleStack-NodeJsFunction6DD2A8DD-adO4KmEjQSuq] 5:10:46 PM >>> `watch` shows only the first 100 log messages - the rest have been truncated...

Before that, the logs show only 5 messages, so the limit of 100 was definitely not hit.

Reproduction Steps

My CDK app is super basic:

import * as cdk from '@aws-cdk/core';
import * as lambda from '@aws-cdk/aws-lambda';
import * as apig from '@aws-cdk/aws-apigateway';

export class HackathonExampleStack extends cdk.Stack {
    constructor(scope: cdk.Construct, id: string, props?: cdk.StackProps) {
        super(scope, id, props);

        const func = new lambda.Function(this, 'NodeJsFunction', {
            // functionName: 'hackathon-function',
            code: lambda.Code.fromAsset(`${__dirname}/lambda-code`),
            runtime: lambda.Runtime.NODEJS_14_X,
            handler: 'index.handler',
        });
        new apig.LambdaRestApi(this, 'RestAPi', {
            handler: func,
        });
        new lambda.Function(this, 'SecondLambdaFunction', {
            code: lambda.Code.fromInline(`
                function handler(_event, _context, callback) {
                    callback(null, 'Success!');
                }

                exports.h = handler;
            `),
            runtime: lambda.Runtime.NODEJS_12_X,
            handler: 'index.h',
        });
    }
}

What did you expect to happen?

Logs would be shown nicely.

What actually happened?

The logs always end with:

[/aws/lambda/HackathonExampleStack-NodeJsFunction6DD2A8DD-adO4KmEjQSuq] 5:10:46 PM >>> `watch` shows only the first 100 log messages - the rest have been truncated...

CDK CLI Version

v1.143.0

Framework Version

v1.143.0

Node.js Version

v16.13.1

OS

MacOS

Language

Typescript

Language Version

3.9.7

Other information

No response

[corymhall]

It looks like as long as there are any events in the log group it will always return a nextToken. I think the solution is to only return that message if we actually get 100 events.

[github-actions]

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