Challenges encountered when executing a node function in an AWS Lambda function

I have observed some unusual behavior with my AWS Lambda function.

Here is the code snippet for the Lambda:

import { TwitterApi } from 'twitter-api-v2';


const client = new TwitterApi({
    appKey: 'APP_KEY',
    appSecret: 'APP_SECRET',
    accessToken: 'ACCESS_TOKEN',
    accessSecret: 'ACCESS_SECRET',
});

const rwClient = client.readWrite


exports.handler = async function (event: any) {
    event.Records.forEach((record: any) => {
        console.log('Event Name: %s', record.eventName);
        console.log('DynamoDB Record: %j', record.dynamodb);

        switch (record.eventName) {
            case "INSERT":
                rwClient.v1.tweet('Hello, this is a test.');
                break;

            default:
                break;
        }
    });
};

When I insert an element into DynamoDb, the EventHandler triggers and should call

rwClient.v1.tweet('Hello, this is a test.');

Theoretically, this should work. However, even though both console.logs before and after the statement are executed, no tweet is sent to the connected twitter account.

If I execute the following code snippet on , the tweet appears in the account:

const twitter_api_v2_1 = require("twitter-api-v2");
const client = new twitter_api_v2_1.TwitterApi({
    appKey: 'APP_KEY',
    appSecret: 'APP_SECRET',
    accessToken: 'ACCESS_TOKEN',
    accessSecret: 'ACCESS_SECRET',
});
const rwc = client.readWrite;
rwc.v1.tweet('Hello, this is a test.');

Does anyone have a solution to make the Lambda function work as expected?

Answer №1

The method rwClient.v1.tweet() is likely an async function and it seems that your request is ending before the async operation completes.

Consider using await to handle tasks concurrently:

exports.handler = async function (event: any) {
    const tasks = event.Records.map(async (record: any) => {
        console.log('Event Name: %s', record.eventName);
        console.log('DynamoDB Record: %j', record.dynamodb);

        switch (record.eventName) {
            case "INSERT":
                await rwClient.v1.tweet('Hello, this is a test.');
                break;

            default:
                break;
        }
    });
    await Promise.all(tasks);
};

Alternatively, you can use await in a for-of loop for sequential execution:

exports.handler = async function (event: any) {
    for (const record of event.Records) {
        console.log('Event Name: %s', record.eventName);
        console.log('DynamoDB Record: %j', record.dynamodb);

        switch (record.eventName) {
            case "INSERT":
                await rwClient.v1.tweet('Hello, this is a test.');
                break;

            default:
                break;
        }
    }
};

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