Boto3 AWS lambda not triggering

Question

I am using code similar to below to trigger an AWS Lambda function on my AWS educate account, when running this nothing triggers on the lambda (the lambda works with the same payload through the test configuration). My session and permissions are also correct as I am able to use boto3 to access S3 resources with the same credentials. What can I try to attempt to fix/troubleshoot this issue?

Apologies if this is vague (I know it is) but I am very confused on why this is happening

import boto3
import json

AWS_ACCESS_KEY_ID ="XXXXXXXXXXXXXXXXXX"
AWS_SECRET_ACCESS_KEY ="XXXXXXXXXXXXXXXXXXXXXXXXXX"
REGION = 'us-east-1'
session = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"

payload = json.dumps({"function":"tweets","amount":10,"time":10})

client = boto3.client('lambda',
                        region_name=REGION,
                        aws_access_key_id=AWS_ACCESS_KEY_ID,
                        aws_secret_access_key=AWS_SECRET_ACCESS_KEY,
                        aws_session_token = session)

response = client.invoke(
    FunctionName="MyFunctionARN",
    InvocationType="RequestResponse",
    Payload=payload
)

Answer 1

Every lambda function has an handler function which is the entry for the code. By default it is lambda_handler. You can also change the default handler function under Runtime settings. The following code will solve your problem.

import boto3
import json

AWS_ACCESS_KEY_ID ="XXXXXXXXXXXXXXXXXX"
AWS_SECRET_ACCESS_KEY ="XXXXXXXXXXXXXXXXXXXXXXXXXX"
REGION = 'us-east-1'
session = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX"
def lambda_handler(event,context):
    payload = json.dumps({"function":"tweets","amount":10,"time":10})

    client = boto3.client('lambda',
                        region_name=REGION,
                        aws_access_key_id=AWS_ACCESS_KEY_ID,
                        aws_secret_access_key=AWS_SECRET_ACCESS_KEY,
                        aws_session_token = session)

    response = client.invoke(
        FunctionName="MyFunctionARN",
        InvocationType="RequestResponse",
        Payload=payload
    )