Commit - adding basic python function and app setup

Author: John Peurifoy

.gitignore

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+build/
+cdk.out/
+# Mac Files
+*.DS_Store

README.md

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+# CDK-Lambda-Python-With-Requirements
+
+Project template to show how to use CDK to create a basic lambda function with some pip/python requirements.
+
+## Deployment Instructions
+
+1. `docker run --rm --volume=$(pwd):/lambda-build -w=/lambda-build lambci/lambda:build-python3.8 pip install -r requirements-layer.txt --target build/python`
+2. `cdk synth`
+3. `cdk deploy`
+
+## Testing
+
+Go to the AWS console and hit `test`!

app.py

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+"""Main entrance for AWS CDK deployment.
+Deploys a sample script with python dependencies to lambda.
+
+BEFORE RUNNING THIS, make sure to create the `build` dependency folder. To do this:
+docker run --rm --volume=$(pwd):/lambda-build -w=/lambda-build lambci/lambda:build-python3.8 pip install -r requirements-layer.txt --target build/python
+"""
+
+from aws_cdk import (
+    aws_ec2 as ec2,
+    aws_events as events,
+    aws_lambda as lambda_,
+    aws_events_targets as targets,
+    App, Duration, Environment, Stack
+)
+
+
+# External resources that this app depends on.
+AWS_ACCOUNT_ID = '<>'
+AWS_REGION = 'eu-west-2'
+
+
+class LambdaCronStack(Stack):
+    def __init__(self, app: App, id: str, **kwargs) -> None:
+        super().__init__(app, id, **kwargs)
+
+        with open("lambda-handler.py", encoding="utf8") as fp:
+            handler_code = fp.read()
+
+        lambdaLayer = lambda_.LayerVersion(
+            self,
+            'lambda-layer-dependencies-template',
+            code = lambda_.Code.from_asset("build/"),
+            compatible_runtimes = [lambda_.Runtime.PYTHON_3_8],
+        )
+
+        lambdaFn = lambda_.Function(
+            self, "template-lambda",
+            code=lambda_.InlineCode(handler_code),
+            handler="index.lambda_handler",
+            timeout=Duration.seconds(900),
+            layers = [lambdaLayer],
+            runtime=lambda_.Runtime.PYTHON_3_8,
+        )
+
+        rule = events.Rule(
+            self, "Rule",
+            schedule=events.Schedule.rate(Duration.minutes(5)),
+        )
+        rule.add_target(targets.LambdaFunction(lambdaFn))
+
+
+app = App()
+LambdaCronStack(app, "Template-Lambda", env=Environment(account=AWS_ACCOUNT_ID, region=AWS_REGION))
+app.synth()

cdk.json

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+{
+    "app": "python3 app.py"
+}

lambda-handler.py

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+"""Basic function to simulate an import of an external library
+and a call to it.
+"""
+import requests
+import json
+
+
+def lambda_handler(event, context):
+    """Handler to clear all records from redis.
+    """
+    print(f"Lambda handler called, calling reuqests now.")
+
+    r = requests.get('https://www.google.com')
+
+    print(r)
+    print(r.content)
+
+    return {
+        'statusCode': 200,
+        'body': json.dumps(str(r.content))
+    }

requirements-layer.txt

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+requests