- This post create a lambda function container image to send a message to Slack using IaC - AWS CDK 2.0, use this as a quick guide for your practice of those keywords. What’s In This Document You need a slack webhook url of the registered channel to send messages to #!/usr/bin/env python from datetime import datetime import json import requests def handler(event, context): webhook_url = 'https://hooks.slack.com/services/WORKSPACE_ID/WEBHOOK_ID' footer_icon = 'https://static.io/img/cdk.png' color = '#36C5F0' level = ':white_check_mark: INFO :white_check_mark:' curr_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S') message = event['msg'] slack_payload = {"username": "From-Lambda-Image", "attachments": [{"fallback": "Required plain-text summary of the attachment.", "pretext": level, "color": color, "text": message, "footer": curr_time, "footer_icon": footer_icon}]} requests.post(webhook_url, data=json.dumps(slack_payload), headers={'Content-Type': 'application/json'}) Enter fullscreen mode Exit fullscreen mode Dockerfile should use aws-lambda-* as a base image in order to have lambda API FROM amazon/aws-lambda-python:3.8 RUN yum -y update && \ yum install -y python3-pip && \ pip3 install requests COPY app.py ./ CMD ["app.handler"] Enter fullscreen mode Exit fullscreen mode Stack will create IAM role for writing cloudwatch log Build image and then push to ECR Lambda function container image ⚡ $ tree . ├── app.py ├── docker_cdk │ ├── docker_cdk_stack.py │ ├── __init__.py │ └── __pycache__ │ ├── docker_cdk_stack.cpython-38.pyc │ └── __init__.cpython-38.pyc ├── requirements.txt ├── resource │ ├── app.py │ └── Dockerfile ├── setup.py └── source.bat Enter fullscreen mode Exit fullscreen mode from constructs import Construct from aws_cdk import ( Stack, aws_lambda as _lambda, aws_iam as iam ) import os class DockerCdkStack(Stack): def __init__(self, scope: Construct, construct_id: str, env, **kwargs) -> None: super().__init__(scope, construct_id, env=env, **kwargs) policy_statement = iam.PolicyStatement( effect=iam.Effect.ALLOW, actions=[ "logs:CreateLogStream", "logs:CreateLogGroup", "logs:PutLogEvents" ], resources=['arn:aws:logs:*:*:*'], conditions={'StringEquals': {"aws:RequestedRegion": "ap-northeast-2"}} ) lambda_role = iam.Role(self, 'LambdaRole', assumed_by=iam.ServicePrincipal("lambda.amazonaws.com"), role_name='docker-cdk-role') lambda_role.add_to_policy(statement=policy_statement) lambda_image = _lambda.DockerImageFunction( self, 'DockerImageFunc', function_name='docker-aws-cdk', code=_lambda.DockerImageCode.from_image_asset( directory=f'{os.getcwd()}/resource', file='Dockerfile', exclude=['cdk.out'], ), role=lambda_role ) Enter fullscreen mode Exit fullscreen mode ⚡ $ aws lambda invoke --function-name docker-aws-cdk --region ap-northeast-2 --payload '{"msg":"Hello"}' --cli-binary-format raw-in-base64-out outfile { "StatusCode": 200, "ExecutedVersion": "$LATEST" } ⚡ $ aws lambda invoke --function-name docker-aws-cdk --region ap-northeast-2 --payload '{"msg":"How are you?"}' --cli-binary-format raw-in-base64-out outfile { "StatusCode": 200, "ExecutedVersion": "$LATEST" } Enter fullscreen mode Exit fullscreen mode 
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