この記事は公開されてから1年以上経過しています。情報が古い可能性がありますので十分ご注意ください。
前提
・イベント通知したいS3バケットが作成済みであること
・CloudFormationのテンプレートをyaml形式で作成する
手順
CloudFormationテンプレートを使って、AWS CloudFormationコンソール上でスタックの作成手順を説明します。
CloudFormationテンプレート
S3EventNotification.yaml
AWSTemplateFormatVersion: 2010-09-09
Description: >-
Sample template to illustrate use of existing S3 bucket as an event source for a Lambda function
Parameters:
NotificationBucket:
Type: String
Description: S3 bucket that's used for the Lambda event notification
Default: ''
Prefix:
Type: String
Description: Prefix of the object key name for filtering rules
Default: 'test_prefix'
Suffix:
Type: String
Description: Suffix of the object key name for filtering rules
Default: 'txt'
Resources:
S3NotificationLambdaFunction:
Type: 'AWS::Lambda::Function'
Properties:
Code:
ZipFile: |
import json
def lambda_handler(event,context):
bucket = event['Records'][0]['s3']['bucket']['name']
key = event['Records'][0]['s3']['object']['key']
print(key+' has been created '+'in Bucket '+bucket)
Handler: index.lambda_handler
Role: !GetAtt LambdaIAMRole.Arn
Runtime: python3.9
Timeout: 5
LambdaIAMRole:
Type: 'AWS::IAM::Role'
Properties:
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service:
- lambda.amazonaws.com
Action:
- 'sts:AssumeRole'
Path: /
Policies:
- PolicyName: root
PolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Action:
- 's3:GetBucketNotification'
- 's3:PutBucketNotification'
Resource: !Sub 'arn:aws:s3:::${NotificationBucket}'
- Effect: Allow
Action:
- 'logs:CreateLogGroup'
- 'logs:CreateLogStream'
- 'logs:PutLogEvents'
Resource: 'arn:aws:logs:*:*:*'
LambdaInvokePermission:
Type: 'AWS::Lambda::Permission'
Properties:
FunctionName: !GetAtt S3NotificationLambdaFunction.Arn
Action: 'lambda:InvokeFunction'
Principal: s3.amazonaws.com
SourceAccount: !Ref 'AWS::AccountId'
SourceArn: !Sub 'arn:aws:s3:::${NotificationBucket}'
LambdaTrigger:
Type: 'Custom::LambdaTrigger'
DependsOn: LambdaInvokePermission
Properties:
ServiceToken: !GetAtt CustomResourceLambdaFunction.Arn
Id: !Sub
- S3LambdaNotif-${UniqueId}
- UniqueId: !Select [0, !Split ['-', !Select [2, !Split [/, !Ref 'AWS::StackId']]]]
Bucket: !Ref NotificationBucket
Prefix: !Ref Prefix
Suffix: !Ref Suffix
LambdaArn: !GetAtt S3NotificationLambdaFunction.Arn
CustomResourceLambdaFunction:
Type: 'AWS::Lambda::Function'
Properties:
Handler: index.lambda_handler
Role: !GetAtt LambdaIAMRole.Arn
Code:
ZipFile: |
import json
import boto3
import cfnresponse
SUCCESS = "SUCCESS"
FAILED = "FAILED"
print('Loading function')
s3 = boto3.resource('s3')
def lambda_handler(event, context):
print("Received event: " + json.dumps(event, indent=2))
responseData={}
try:
if event['RequestType'] == 'Delete':
print("Request Type:",event['RequestType'])
Id=event['ResourceProperties']['Id']
Bucket=event['ResourceProperties']['Bucket']
delete_notification(Id, Bucket)
print("Sending response to custom resource after Delete")
elif event['RequestType'] == 'Create' or event['RequestType'] == 'Update':
print("Request Type:",event['RequestType'])
Id=event['ResourceProperties']['Id']
Prefix=event['ResourceProperties']['Prefix']
Suffix=event['ResourceProperties']['Suffix']
LambdaArn=event['ResourceProperties']['LambdaArn']
Bucket=event['ResourceProperties']['Bucket']
add_notification(Id, Prefix, Suffix, LambdaArn, Bucket)
responseData={'Bucket':Bucket}
print("Sending response to custom resource")
responseStatus = 'SUCCESS'
except Exception as e:
print('Failed to process:', e)
responseStatus = 'FAILED'
responseData = {'Failure': 'Something bad happened.'}
cfnresponse.send(event, context, responseStatus, responseData)
def add_notification(Id, Prefix, Suffix, LambdaArn, Bucket):
bucket_notification = s3.BucketNotification(Bucket)
print(bucket_notification.lambda_function_configurations)
lambda_function_configurations = bucket_notification.lambda_function_configurations
if lambda_function_configurations is None:
lambda_function_configurations = []
else:
lambda_function_configurations = [e for e in lambda_function_configurations if e['Id'] != Id]
lambda_config = {}
lambda_config['Id'] = Id
lambda_config['LambdaFunctionArn'] = LambdaArn
lambda_config['Events'] = ['s3:ObjectCreated:*']
lambda_config['Filter'] = {'Key': {'FilterRules': [
{'Name': 'Prefix', 'Value': Prefix},
{'Name': 'Suffix', 'Value': Suffix}
]}
}
lambda_function_configurations.append(lambda_config)
print(lambda_function_configurations)
put_bucket_notification(bucket_notification, lambda_function_configurations)
print("Put request completed....")
def delete_notification(Id, Bucket):
bucket_notification = s3.BucketNotification(Bucket)
print(bucket_notification.lambda_function_configurations)
lambda_function_configurations = bucket_notification.lambda_function_configurations
if lambda_function_configurations is not None:
lambda_function_configurations = [e for e in lambda_function_configurations if e['Id'] != Id]
print(lambda_function_configurations)
put_bucket_notification(bucket_notification, lambda_function_configurations)
print("Delete request completed....")
def put_bucket_notification(BucketNotification, LambdaFunctionConfigurations):
notification_configuration = {}
if LambdaFunctionConfigurations is not None:
notification_configuration['LambdaFunctionConfigurations'] = LambdaFunctionConfigurations
if BucketNotification.queue_configurations is not None:
notification_configuration['QueueConfigurations'] = BucketNotification.queue_configurations
if BucketNotification.topic_configurations is not None:
notification_configuration['TopicConfigurations'] = BucketNotification.topic_configurations
print(notification_configuration)
response = BucketNotification.put(
NotificationConfiguration= notification_configuration
)
Runtime: python3.9
Timeout: 50AWS CloudFormationコンソール上でスタックの作成
AWS コンソールをログインし、CloudFormationを開きます。
その後、「スタックの作成」⇒「新しいリソースを使用（標準）」をクリックし、テンプレートを指定して「次へ」をクリックします。
パラメータを入力して「次へ」をクリックします。
「次へ」をクリックします。
「AWS CloudFormation によって IAM リソースが作成される場合があることを承認します。」をチェックし、「スタックの作成」をクリックします。
作成後の動作確認
スタックのリソースタブを開き、下記のようにLambdaをクリックします。
S3バケットがトリガーに追加されていることを確認します。
S3バケットのトリガー詳細を確認します。
S3バケットにテストファイルをアップロードします。
「モニタリング」をクリックします。
「CloudWatchのログを表示」をクリックします。
「ログストリーム」をクリックし、Lambdaに実装しているログが出力されいることを確認します。
参考
https://aws.amazon.com/jp/premiumsupport/knowledge-center/cloudformation-s3-notification-lambda/