added localstack cloud counter lambda demo

2022-06-20 17:16:57 +02:00
parent f081a50a4a
commit 2cba78a344
6 changed files with 314 additions and 0 deletions
--- a/example-projects/counter-demo/aws-lambda-localstack/lambda_function.py
+++ b/example-projects/counter-demo/aws-lambda-localstack/lambda_function.py
@ -0,0 +1,52 @@
+# 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=globally_unique_s3_group_bucket_name, Key='us-east-1')
+
+    counter = int(response['Body'].read().decode('utf-8'))
+
+    debug = ""
+    incr = 0
+    if 'body' in event:
+        body = str(base64.b64decode(event['body']).decode("utf-8"))
+        if body.startswith('input'):
+            incr = int(body.rsplit('=')[1])
+    elif 'input' in event:
+        incr = int(event['input'])
+
+    if incr is not 0:
+        counter = counter + incr
+        response = s3_client.put_object(Bucket=globally_unique_s3_group_bucket_name, Key='us-east-1', Body=str(counter))
+
+    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'
+              '<input type="submit" value="Increment"></form>\n'
+              # '<hr><b>Lambda Event:</b><br>' + repr(event) + '\n'
+              # '<hr><b>Lambda Context:</b><br>' + repr(context) + '\n'
+              '</body></html>\n')
+
+    return {
+        'statusCode': 200,
+        'headers': {
+            'Content-Type': 'text/html',
+            'x-hsfd-counter': str(counter)
+        },
+        'body': output
+    }