AWS SAM CLI cannot access Dynamo DB when function is invoked locally - amazon-web-services

Question

I am building an AWS lambda with aws-sam-cli. In the function, I want to access a certain DynamoDB table.
My issue is that the function comes back with this error when I invoke it locally with the sam local invoke command: ResourceNotFoundException: Requested resource not found
const axios = require('axios')
const AWS = require('aws-sdk')
AWS.config.update({region: <MY REGION>})
const dynamo = new AWS.DynamoDB.DocumentClient()
exports.handler = async (event) => {
const scanParams = {
TableName: 'example-table'
}
const scanResult = await dynamo.scan(scanParams).promise().catch((error) => {
console.log(`Scan error: ${error}`)
// => Scan error: ResourceNotFoundException: Requested resource not found
})
console.log(scanResult)
}
However, if I actually sam deploy it to AWS and test it in the actual Lambda console, it logs the table info correctly.
{
Items: <TABLE ITEMS>,
Count: 1,
ScannedCount: 1
}
Is this expected behavior? Or is there some additional configuration I need to do for it to work locally? My template.yaml looks like this:
AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Description: 'Example SAM stack'
Resources:
ExampleFunction:
Type: AWS::Serverless::Function
Properties:
Handler: index.handler
Runtime: nodejs12.x
Policies:
- DynamoDBCrudPolicy:
TableName: 'example-table'

Answer 1

I believe when you invoke your Lambda locally, SAM is not recognising which profile to use for the remote resources, ex: DynamoDB
Try to pass the credentials profile for your remote dynamoDB
ex:
sam local invoke --profile default
You can check the command documentation here: https://docs.aws.amazon.com/serverless-application-model/latest/developerguide/sam-cli-command-reference-sam-local-invoke.html