added localstack cloud counter lambda demo
This commit is contained in:
Sebastian Rieger
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[default]
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region = us-east-1
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[default]
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aws_access_key_id=test
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aws_secret_access_key=test
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from datetime import date
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import json
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import boto3
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################################################################################################
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#
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# Configuration Parameters
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#
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################################################################################################
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endpoint_url = "http://localhost.localstack.cloud:4566"
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# region = 'eu-central-1'
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region = 'us-east-1'
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functionName = 'cloudcomp-counter-lambda-demo'
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################################################################################################
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#
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# boto3 code
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#
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################################################################################################
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client = boto3.setup_default_session(region_name=region)
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lClient = boto3.client('lambda', endpoint_url=endpoint_url)
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print("Invoking function...")
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print("------------------------------------")
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try:
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response = lClient.invoke(
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FunctionName=functionName,
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Payload='{ "input": "1" }'
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)
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except lClient.exceptions.ResourceNotFoundException:
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print('Function not available.')
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streamingBody = response['Payload']
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result = streamingBody.read()
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jsonResult = json.loads(result)
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print(json.dumps(response, indent=4, sort_keys=True, default=str))
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print('Payload:\n' + str(result) + "\n")
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print("Counter is now at: " + jsonResult['headers']['x-hsfd-counter'])
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# import json
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import base64
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import os
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import boto3
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def lambda_handler(event, context):
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print('## ENVIRONMENT VARIABLES')
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print(os.environ)
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print('## EVENT')
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print(event)
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globally_unique_s3_group_bucket_name = os.environ.get("bucketName")
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print('Trying to access bucket: ' + globally_unique_s3_group_bucket_name)
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s3_client = boto3.client('s3')
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response = s3_client.get_object(Bucket=globally_unique_s3_group_bucket_name, Key='us-east-1')
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counter = int(response['Body'].read().decode('utf-8'))
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debug = ""
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incr = 0
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if 'body' in event:
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body = str(base64.b64decode(event['body']).decode("utf-8"))
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if body.startswith('input'):
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incr = int(body.rsplit('=')[1])
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elif 'input' in event:
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incr = int(event['input'])
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if incr is not 0:
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counter = counter + incr
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response = s3_client.put_object(Bucket=globally_unique_s3_group_bucket_name, Key='us-east-1', Body=str(counter))
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output = ('<html><head><title>Counter Demo</title>\n'
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# '<meta http-equiv="refresh" content="5"/></head><body>\n'
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'<h2>HS Fulda Cloud Computing - Counter Demo</h2>\n'
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'<p><b>HTML-Output:</b> ' + str(counter) + '</p></body>\n'
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'<form method=POST action="">\n'
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'<input type="hidden" name="input" value="1">\n'
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'<input type="submit" value="Increment"></form>\n'
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# '<hr><b>Lambda Event:</b><br>' + repr(event) + '\n'
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# '<hr><b>Lambda Context:</b><br>' + repr(context) + '\n'
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'</body></html>\n')
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return {
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'statusCode': 200,
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'headers': {
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'Content-Type': 'text/html',
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'x-hsfd-counter': str(counter)
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},
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'body': output
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}
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146
example-projects/counter-demo/aws-lambda-localstack/start.py
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146
example-projects/counter-demo/aws-lambda-localstack/start.py
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from datetime import date
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import zipfile
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import boto3
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from botocore.exceptions import ClientError
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################################################################################################
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#
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# Configuration Parameters
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#
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################################################################################################
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endpoint_url = "http://localhost.localstack.cloud:4566"
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# you need to create a bucket in S3, here in this demo it is called "cloudcomp-counter", but
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# bucket names need to be world wide unique ;) The demo looks for a file that is named
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# "us-east-1" (same as our default region) in the bucket and expects a number in it to increase
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groupNr = 22
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currentYear = date.today().year
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globallyUniqueS3GroupBucketName = "cloudcomp-counter-" + str(currentYear) + "-group" + str(groupNr)
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# region = 'eu-central-1'
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region = 'us-east-1'
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functionName = 'cloudcomp-counter-lambda-demo'
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# see ARN for AWS Academy LabRole function here:
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# https://us-east-1.console.aws.amazon.com/iamv2/home?region=us-east-1#/roles/details/LabRole?section=permissions
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# roleName = 'arn:aws:iam::309000625112:role/service-role/cloudcomp-counter-demo-role-6rs7pah3'
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# roleName = 'arn:aws:iam::919927306708:role/cloudcomp-s3-access'
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roleName = 'arn:aws:iam::488766701848:role/LabRole'
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################################################################################################
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#
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# boto3 code
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#
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################################################################################################
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def cleanup_s3_bucket(s3_bucket):
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# Deleting objects
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for s3_object in s3_bucket.objects.all():
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s3_object.delete()
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# Deleting objects versions if S3 versioning enabled
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for s3_object_ver in s3_bucket.object_versions.all():
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s3_object_ver.delete()
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client = boto3.setup_default_session(region_name=region)
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s3Client = boto3.client('s3', endpoint_url=endpoint_url)
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s3Resource = boto3.resource('s3', endpoint_url=endpoint_url)
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lClient = boto3.client('lambda', endpoint_url=endpoint_url)
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apiClient = boto3.client("apigatewayv2", endpoint_url=endpoint_url)
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print("Deleting old function...")
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print("------------------------------------")
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try:
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response = lClient.delete_function(
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FunctionName=functionName,
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)
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except lClient.exceptions.ResourceNotFoundException:
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print('Function not available. No need to delete it.')
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print("Deleting old bucket...")
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print("------------------------------------")
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try:
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currentBucket = s3Resource.Bucket(globallyUniqueS3GroupBucketName)
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cleanup_s3_bucket(currentBucket)
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currentBucket.delete()
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except ClientError as e:
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print(e)
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print("creating S3 bucket (must be globally unique)...")
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print("------------------------------------")
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try:
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response = s3Client.create_bucket(Bucket=globallyUniqueS3GroupBucketName)
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response = s3Client.put_object(Bucket=globallyUniqueS3GroupBucketName, Key='us-east-1', Body=str(0))
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except ClientError as e:
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print(e)
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print("creating new function...")
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print("------------------------------------")
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zf = zipfile.ZipFile('lambda-deployment-archive.zip', 'w', zipfile.ZIP_DEFLATED)
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zf.write('lambda_function.py')
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zf.close()
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lambdaFunctionARN = ""
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with open('lambda-deployment-archive.zip', mode='rb') as file:
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zipfileContent = file.read()
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response = lClient.create_function(
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FunctionName=functionName,
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Runtime='python3.9',
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Role=roleName,
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Code={
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'ZipFile': zipfileContent
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},
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Handler='lambda_function.lambda_handler',
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Publish=True,
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Environment={
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'Variables': {
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'bucketName': globallyUniqueS3GroupBucketName
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}
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}
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)
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lambdaFunctionARN = response['FunctionArn']
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print("Lambda Function and S3 Bucket to store the counter are available. Sadly, AWS Academy labs do not allow\n"
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"creating an API gateway to be able to access the Lambda function directly via HTTP from the browser, as\n"
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"shown in https://348yxdily0.execute-api.eu-central-1.amazonaws.com/default/cloudcomp-counter-demo.\n"
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"\n"
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"However you can now run invoke-function.py to view an increment the counter. You can also use \n"
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"the test button in the Lambda AWS console. In this case you need to send the content\n"
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"\n"
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"{\n"
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" \"input\": \"1\"\n"
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"}\n"
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"\n"
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"to increment the counter by 1.\n"
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"Try to understand how Lambda can be used to cut costs regarding cloud services and what its pros\n"
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"and cons are.\n")
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# sadly, AWS Academy Labs don't allow API gateways
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# API gateway would allow getting an HTTP endpoint that we could access directly in the browser,
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# that would call our function, as in the provided demo:
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#
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# https://348yxdily0.execute-api.eu-central-1.amazonaws.com/default/cloudcomp-counter-demo
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# print("creating API gateway...")
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# print("------------------------------------")
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#
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# #apiArn = ""
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# response = apiClient.create_api(
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# Name=functionName + '-api',
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# ProtocolType='HTTP',
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# Target=lambdaFunctionARN
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# )
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# #apiArn=response['']
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#
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# #response = lClient.create_event_source_mapping(
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# # EventSourceArn=apiArn,
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# #)
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64
example-projects/counter-demo/aws-lambda-localstack/stop.py
Normal file
64
example-projects/counter-demo/aws-lambda-localstack/stop.py
Normal file
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from datetime import date
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import boto3
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################################################################################################
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#
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# Configuration Parameters
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#
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################################################################################################
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# you need to create a bucket in S3, here in this demo it is called "cloudcomp-counter", but
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# bucket names need to be world wide unique ;) The demo looks for a file that is named
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# "us-east-1" (same as our default region) in the bucket and expects a number in it to increase
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groupNr = 22
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currentYear = date.today().year
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globallyUniqueS3GroupBucketName = "cloudcomp-counter-" + str(currentYear) + "-group" + str(groupNr)
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# region = 'eu-central-1'
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region = 'us-east-1'
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functionName = 'cloudcomp-counter-lambda-demo'
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# roleName = 'arn:aws:iam::309000625112:role/service-role/cloudcomp-counter-demo-role-6rs7pah3'
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roleName = 'arn:aws:iam::919927306708:role/cloudcomp-s3-access'
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################################################################################################
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#
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# boto3 code
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#
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################################################################################################
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def cleanup_s3_bucket(s3_bucket):
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# Deleting objects
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for s3_object in s3_bucket.objects.all():
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s3_object.delete()
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# Deleting objects versions if S3 versioning enabled
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for s3_object_ver in s3_bucket.object_versions.all():
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s3_object_ver.delete()
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client = boto3.setup_default_session(region_name=region)
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s3Client = boto3.client('s3')
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s3Resource = boto3.resource('s3')
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lClient = boto3.client('lambda')
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print("Deleting old function...")
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print("------------------------------------")
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try:
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response = lClient.delete_function(
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FunctionName=functionName,
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)
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except lClient.exceptions.ResourceNotFoundException:
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print('Function not available. No need to delete it.')
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print("Deleting old bucket...")
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print("------------------------------------")
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try:
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currentBucket = s3Resource.Bucket(globallyUniqueS3GroupBucketName)
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cleanup_s3_bucket(currentBucket)
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currentBucket.delete()
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except ClientError as e:
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print(e)
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