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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 boto3
################################################################################################
#
@@ -31,7 +32,7 @@ try:
Payload='{ "input": "1" }'
)
except lClient.exceptions.ResourceNotFoundException:
print('Function not available. No need to delete it.')
print('Function not available.')
streamingBody = response['Payload']
result = streamingBody.read()

19
example-projects/counter-demo/aws-lambda/lambda_function.py
View File

@@ -1,11 +1,20 @@
# import json
import base64
import os
import boto3
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')
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'))
@@ -20,11 +29,11 @@ def lambda_handler(event, context):
if incr is not 0:
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'
'<meta http-equiv="refresh" content="5"/></head><body>\n'
'<h2>HS Fulda - TCPTimeCounter REST Service</h2>\n'
output = ('<html><head><title>Counter Demo</title>\n'
# '<meta http-equiv="refresh" content="5"/></head><body>\n'
'<h2>HS Fulda Cloud Computing - Counter Demo</h2>\n'
'<p><b>HTML-Output:</b> ' + str(counter) + '</p></body>\n'
'<form method=POST action="">\n'
'<input type="hidden" name="input" value="1">\n'

97
example-projects/counter-demo/aws-lambda/start.py
View File

@@ -1,5 +1,7 @@
import boto3
from datetime import date
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
# "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 = 'us-east-1'
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::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)
s3Client = boto3.client('s3')
s3Resource = boto3.resource('s3')
lClient = boto3.client('lambda')
apiClient = boto3.client("apigatewayv2")
print("Deleting old function...")
print("------------------------------------")
try:
@@ -38,6 +59,24 @@ try:
except lClient.exceptions.ResourceNotFoundException:
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("------------------------------------")
@@ -52,27 +91,53 @@ with open('lambda-deployment-archive.zip', mode='rb') as file:
response = lClient.create_function(
FunctionName=functionName,
Runtime='python3.8',
Runtime='python3.9',
Role=roleName,
Code={
'ZipFile': zipfileContent
},
Handler='lambda_function.lambda_handler',
Publish=True,
Environment={
'Variables': {
'bucketName': globallyUniqueS3GroupBucketName
}
}
)
lambdaFunctionARN = response['FunctionArn']
print("creating API gateway...")
print("------------------------------------")
print("Lambda Function and S3 Bucket to store the counter are available. Sadly, AWS Academy labs do not allow\n"
"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 = ""
response = apiClient.create_api(
Name=functionName + '-api',
ProtocolType='HTTP',
Target=lambdaFunctionARN
)
#apiArn=response['']
# sadly, AWS Academy Labs don't allow API gateways
# API gateway would allow getting an HTTP endpoint that we could access directly in the browser,
# that would call our function, as in the provided demo:
#
# https://348yxdily0.execute-api.eu-central-1.amazonaws.com/default/cloudcomp-counter-demo
#response = lClient.create_event_source_mapping(
# EventSourceArn=apiArn,
#)
# print("creating API gateway...")
# 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
View File

@@ -1,5 +1,4 @@
import boto3
import zipfile
################################################################################################
#