Accessing DynamoDB from Lambda¶

We can open up a lambda function and use aws-sdk integrated DynamoDB class to connect to it.

const AWS = require('aws-sdk');
const dynamodb = new AWS.DynamoDB({
    region: 'eu-central-1',
    apiVersion: '2012-08-10'
});

Setting roles¶

We need to go to IAM -> Roles and search for our lambda function. Attach dynamoDB policy.

Setting up lambda function¶

We then can put logic to post logic.

const AWS = require('aws-sdk');
const dynamodb = new AWS.DynamoDB({
    region: 'eu-central-1',
    apiVersion: '2012-08-10'
});

exports.fn = (event, context, callback) => {
    const params = {
        Item: {
            "UserId": {
                S: "user_" + Math.random()
            },
            "Age": {
                N: "" + event.age
            },
            "Height": {
                N: "" + event.height
            },
            "Income": {
                N: "" + event.income
            }
        },
        TableName: "compare-yourself"
    }

    dynamodb.putItem(params, function(err, data) {
        if(err) {
            console.log(err)
            callback()
        } else {
            console.log(data)
            callback()
        }  
    });

}

Hit on save and trigger a test.

And we can check the dynamoDB, the item has been added