Created
August 16, 2022 19:34
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Whiteboarding - on_message.py
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import boto3 | |
import os | |
import json | |
WHITEBOARDING_TABLE = os.environ['WHITEBOARDING_TABLE'] | |
db_client = boto3.resource('dynamodb') | |
table = db_client.Table(WHITEBOARDING_TABLE) | |
def handler(event, context): | |
print(f"Event: {event}, Context: {context}") | |
domain = event["requestContext"]["domainName"] | |
stage = event["requestContext"]["stage"] | |
endpoint_url = f"https://{domain}/{stage}" | |
client = boto3.client('apigatewaymanagementapi', endpoint_url=endpoint_url) | |
connection_id = event["requestContext"]["connectionId"] | |
body = json.loads(event["body"]) | |
response = table.get_item( | |
Key={'whiteboardId': "123"} | |
) | |
print(response) | |
connections = [] | |
if "Item" in response: | |
for user in response['Item']['users']: | |
if user == connection_id: | |
connections.append(user) | |
continue | |
try: | |
client.post_to_connection( | |
ConnectionId=user, | |
Data=body["message"] | |
) | |
connections.append(user) | |
except: | |
print(f"user update failed: {user}") | |
table.update_item( | |
Key={'whiteboardId': "123"}, | |
ExpressionAttributeNames={'#users': 'users'}, | |
ExpressionAttributeValues={ | |
':users': connections | |
}, | |
UpdateExpression="SET #users = :users" | |
) | |
return {"statusCode": 200} |
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