Using an EventBridge event pattern string in a lambda function - amazon-web-services

Question

I have a lambda function using Python.
It's connected to an EventBridge rule that triggers every time there's a change in a Glue table.
The event pattern it's outputting looks something like this:
{
"version":"0",
"detail":{
"databaseName":"flights-db",
"typeOfChange":"UpdateTable",
"tableName":"flightscsv"
}
}
I want to get the tableName and databaseName values from this output into the function as a variable.
My Lambda function:
import json
import boto3
def lambda_handler(event, context):
boto3_version = boto3.__version__
return_statement = 'Boto3 version: ', boto3_version,\
'Event output: ', event
return {
'statusCode': 200,
'body': json.dumps(return_statement)
}
I was expecting to get the event pattern output from the event in my return statement but that's not the case.
When testing this function the return output for event is:
{\"key1\": \"value1\", \"key2\": \"value2\", \"key3\": \"value3\"}
This key and values are defined like this in the Test Pattern for the function.
The eventbridge rule is defined like this:
How can I get the values from the event pattern to a variable?
Do I need to configure the test pattern to get the results into event?
EDIT:
Picture of log events for the table change event:

Answer 1

The event object generated by CloudWatch (CW) Events / Event Bridge (EB) are listed here. These events will be passed to your function when it is going to get triggered by EB.
Your EB Event Pattern should be:
{
"source": ["aws.glue"],
"detail-type": ["Glue Data Catalog Table State Change"]
}
The above should match changes to any tables in your glue catalog. The event should be similar to the one below:
{
"version": "0",
"id": "2617428d-715f-edef-70b8-d210da0317a0",
"detail-type": "Glue Data Catalog Table State Change",
"source": "aws.glue",
"account": "123456789012",
"time": "2019-01-16T18:16:01Z",
"region": "eu-west-1",
"resources": [
"arn:aws:glue:eu-west-1:123456789012:table/d1/t1"
],
"detail": {
"databaseName": "d1",
"changedPartitions": [
"[C.pdf, dir3]",
"[D.doc, dir4]"
],
"typeOfChange": "BatchCreatePartition",
"tableName": "t1"
}
}
Thus, to get tableName and databaseName your lambda function could be:
import json
import boto3
def lambda_handler(event, context):
boto3_version = boto3.__version__
print(event)
table_name = event['detail']['tableName']
database_name = event['detail']['databaseName']
print(table_name, database_name)
return_statement = {
'boto3_version': boto3_version,
'table_name': table_name,
'database_name': database_name
}
return {
'statusCode': 200,
'body': json.dumps(return_statement)
}
For testing, you can setup sample EB event in your lambda test window: