Setting Up an S3 Trigger for an AWS Lambda Function in the AWS Clouformation
To set up an AWS Lambda function, an Amazon S3 bucket, and an S3 trigger for the function using AWS CloudFormation, you can use the AWS::Lambda::Function, AWS::S3::Bucket, and AWS::Lambda::EventSourceMapping resources. Here is an example of how you might use these resources in a CloudFormation template:
AWSTemplateFormatVersion: "2010-09-09"
Description: "Create Lambda S3 triggger"
Parameters:
MyBucketName:
Description: S3 Bucket Name
Type: String
Default: abhaysingh091290
Resources:
MyIAMRole:
Type: AWS::IAM::Role
Properties:
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action:
- sts:AssumeRole
Policies:
- PolicyName: MyPolicy
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action:
- s3:ListBucket
Resource: arn:aws:s3:::${MyBucketName}
LambdaPermission:
Type: AWS::Lambda::Permission
Properties:
Action: 'lambda:InvokeFunction'
FunctionName: !Ref MyFunction
Principal: s3.amazonaws.com
SourceArn: !Sub 'arn:aws:s3:::${MyBucketName}'
SourceAccount: !Ref AWS::AccountId
MyFunction:
Type: AWS::Lambda::Function
Properties:
Code:
ZipFile: |
def handler(event, context):
return "Hello, World!"
Handler: index.handler
Role: !GetAtt MyIAMRole.Arn
Runtime: python3.8
Timeout: 30
MyBucket:
Type: AWS::S3::Bucket
Properties:
BucketName: !Ref MyBucketName
NotificationConfiguration:
LambdaConfigurations:
- Event: s3:ObjectCreated:*
Function: !GetAtt MyFunction.Arn
Filter:
S3Key:
Rules:
- Name: Suffix
Value: ".txt"
- Name: Prefix
Value: "test-"
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