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changed Lambda demo to support AWS Academy and create individual bucket for group with globally unique name in S3

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This commit is contained in:
Sebastian Rieger
2022-06-20 12:48:38 +02:00
parent 7059688b5d
commit 1f4a435d84
4 changed files with 98 additions and 24 deletions
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5
example-projects/counter-demo/aws-lambda/invoke-function.py
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@@ -1,5 +1,6 @@
import boto3 from datetime import date
import json import json
import boto3
################################################################################################ ################################################################################################
# #
@@ -31,7 +32,7 @@ try:
Payload='{ "input": "1" }' Payload='{ "input": "1" }'
) )
except lClient.exceptions.ResourceNotFoundException: except lClient.exceptions.ResourceNotFoundException:
print('Function not available. No need to delete it.') print('Function not available.')
streamingBody = response['Payload'] streamingBody = response['Payload']
result = streamingBody.read() result = streamingBody.read()

19
example-projects/counter-demo/aws-lambda/lambda_function.py
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@@ -1,11 +1,20 @@
# import json # import json
import base64 import base64
import os
import boto3 import boto3
def lambda_handler(event, context): def lambda_handler(event, context):
print('## ENVIRONMENT VARIABLES')
print(os.environ)
print('## EVENT')
print(event)
globally_unique_s3_group_bucket_name = os.environ.get("bucketName")
print('Trying to access bucket: ' + globally_unique_s3_group_bucket_name)
s3_client = boto3.client('s3') s3_client = boto3.client('s3')
response = s3_client.get_object(Bucket='cloudcomp-counter', Key='us-east-1') response = s3_client.get_object(Bucket=globally_unique_s3_group_bucket_name, Key='us-east-1')
counter = int(response['Body'].read().decode('utf-8')) counter = int(response['Body'].read().decode('utf-8'))
@@ -20,11 +29,11 @@ def lambda_handler(event, context):
if incr is not 0: if incr is not 0:
counter = counter + incr counter = counter + incr
response = s3_client.put_object(Bucket='cloudcomp-counter', Key='us-east-1', Body=str(counter)) response = s3_client.put_object(Bucket=globally_unique_s3_group_bucket_name, Key='us-east-1', Body=str(counter))
output = ('<html><head><title>TCPTimeCounter REST Service</title>\n' output = ('<html><head><title>Counter Demo</title>\n'
'<meta http-equiv="refresh" content="5"/></head><body>\n' # '<meta http-equiv="refresh" content="5"/></head><body>\n'
'<h2>HS Fulda - TCPTimeCounter REST Service</h2>\n' '<h2>HS Fulda Cloud Computing - Counter Demo</h2>\n'
'<p><b>HTML-Output:</b> ' + str(counter) + '</p></body>\n' '<p><b>HTML-Output:</b> ' + str(counter) + '</p></body>\n'
'<form method=POST action="">\n' '<form method=POST action="">\n'
'<input type="hidden" name="input" value="1">\n' '<input type="hidden" name="input" value="1">\n'

97
example-projects/counter-demo/aws-lambda/start.py
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@@ -1,5 +1,7 @@
import boto3 from datetime import date
import zipfile import zipfile
import boto3
from botocore.exceptions import ClientError
################################################################################################ ################################################################################################
# #
@@ -11,11 +13,21 @@ import zipfile
# bucket names need to be world wide unique ;) The demo looks for a file that is named # bucket names need to be world wide unique ;) The demo looks for a file that is named
# "us-east-1" (same as our default region) in the bucket and expects a number in it to increase # "us-east-1" (same as our default region) in the bucket and expects a number in it to increase
groupNr = 22
currentYear = date.today().year
globallyUniqueS3GroupBucketName = "cloudcomp-counter-" + str(currentYear) + "-group" + str(groupNr)
# region = 'eu-central-1' # region = 'eu-central-1'
region = 'us-east-1' region = 'us-east-1'
functionName = 'cloudcomp-counter-lambda-demo' functionName = 'cloudcomp-counter-lambda-demo'
# see ARN for AWS Academy LabRole function here:
# https://us-east-1.console.aws.amazon.com/iamv2/home?region=us-east-1#/roles/details/LabRole?section=permissions
# roleName = 'arn:aws:iam::309000625112:role/service-role/cloudcomp-counter-demo-role-6rs7pah3' # roleName = 'arn:aws:iam::309000625112:role/service-role/cloudcomp-counter-demo-role-6rs7pah3'
roleName = 'arn:aws:iam::919927306708:role/cloudcomp-s3-access' # roleName = 'arn:aws:iam::919927306708:role/cloudcomp-s3-access'
roleName = 'arn:aws:iam::488766701848:role/LabRole'
################################################################################################ ################################################################################################
# #
@@ -23,12 +35,21 @@ roleName = 'arn:aws:iam::919927306708:role/cloudcomp-s3-access'
# #
################################################################################################ ################################################################################################
def cleanup_s3_bucket(s3_bucket):
# Deleting objects
for s3_object in s3_bucket.objects.all():
s3_object.delete()
# Deleting objects versions if S3 versioning enabled
for s3_object_ver in s3_bucket.object_versions.all():
s3_object_ver.delete()
client = boto3.setup_default_session(region_name=region) client = boto3.setup_default_session(region_name=region)
s3Client = boto3.client('s3')
s3Resource = boto3.resource('s3')
lClient = boto3.client('lambda') lClient = boto3.client('lambda')
apiClient = boto3.client("apigatewayv2") apiClient = boto3.client("apigatewayv2")
print("Deleting old function...") print("Deleting old function...")
print("------------------------------------") print("------------------------------------")
try: try:
@@ -38,6 +59,24 @@ try:
except lClient.exceptions.ResourceNotFoundException: except lClient.exceptions.ResourceNotFoundException:
print('Function not available. No need to delete it.') print('Function not available. No need to delete it.')
print("Deleting old bucket...")
print("------------------------------------")
try:
currentBucket = s3Resource.Bucket(globallyUniqueS3GroupBucketName)
cleanup_s3_bucket(currentBucket)
currentBucket.delete()
except ClientError as e:
print(e)
print("creating S3 bucket (must be globally unique)...")
print("------------------------------------")
try:
response = s3Client.create_bucket(Bucket=globallyUniqueS3GroupBucketName)
response = s3Client.put_object(Bucket=globallyUniqueS3GroupBucketName, Key='us-east-1', Body=str(0))
except ClientError as e:
print(e)
print("creating new function...") print("creating new function...")
print("------------------------------------") print("------------------------------------")
@@ -52,27 +91,53 @@ with open('lambda-deployment-archive.zip', mode='rb') as file:
response = lClient.create_function( response = lClient.create_function(
FunctionName=functionName, FunctionName=functionName,
Runtime='python3.8', Runtime='python3.9',
Role=roleName, Role=roleName,
Code={ Code={
'ZipFile': zipfileContent 'ZipFile': zipfileContent
}, },
Handler='lambda_function.lambda_handler', Handler='lambda_function.lambda_handler',
Publish=True, Publish=True,
Environment={
'Variables': {
'bucketName': globallyUniqueS3GroupBucketName
}
}
) )
lambdaFunctionARN = response['FunctionArn'] lambdaFunctionARN = response['FunctionArn']
print("creating API gateway...") print("Lambda Function and S3 Bucket to store the counter are available. Sadly, AWS Academy labs do not allow\n"
print("------------------------------------") "creating an API gateway to be able to access the Lambda function directly via HTTP from the browser, as\n"
"shown in https://348yxdily0.execute-api.eu-central-1.amazonaws.com/default/cloudcomp-counter-demo.\n"
"\n"
"However you can now run invoke-function.py to view an increment the counter. You can also use \n"
"the test button in the Lambda AWS console. In this case you need to send the content\n"
"\n"
"{\n"
" \"input\": \"1\"\n"
"}\n"
"\n"
"to increment the counter by 1.\n"
"Try to understand how Lambda can be used to cut costs regarding cloud services and what its pros\n"
"and cons are.\n")
#apiArn = "" # sadly, AWS Academy Labs don't allow API gateways
response = apiClient.create_api( # API gateway would allow getting an HTTP endpoint that we could access directly in the browser,
Name=functionName + '-api', # that would call our function, as in the provided demo:
ProtocolType='HTTP', #
Target=lambdaFunctionARN # https://348yxdily0.execute-api.eu-central-1.amazonaws.com/default/cloudcomp-counter-demo
)
#apiArn=response['']
#response = lClient.create_event_source_mapping( # print("creating API gateway...")
# EventSourceArn=apiArn, # print("------------------------------------")
#) #
# #apiArn = ""
# response = apiClient.create_api(
# Name=functionName + '-api',
# ProtocolType='HTTP',
# Target=lambdaFunctionARN
# )
# #apiArn=response['']
#
# #response = lClient.create_event_source_mapping(
# # EventSourceArn=apiArn,
# #)

1
example-projects/counter-demo/aws-lambda/stop.py
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@@ -1,5 +1,4 @@
import boto3 import boto3
import zipfile
################################################################################################ ################################################################################################
# #