CODEWITHSUNDEEP
amazon-web-servicesaws-lambdawebsocketparallel-processingamazon-dynamodb
Kob3Bryant
Kob3Bryant

Reputation: 65

Catch DynamoDB changes

I am developing a game where 2 players are matched against each other using AWS API Gateway Websockets.

Both players submit their moves and update a table in my database. How can I know that I received the two moves, so I can notify both sockets that the round finished?

Now I tried this:

But this approach fails if they submit their moves at the same time, as both reads would give no results.

My DB design is:

(I have 2 records for each game because I need to be able to query games based on users too, which helps with the statistics and other functionalities of the game)

As a temporary solution, I am using DynamoDB Streams to invoke a lambda every time users submit their moves, and if I have 2 moves, I send through their sockets what I need to send. However, I think that using Streams is only for logging purposes, and not business logic.

Upvotes: 1

Views: 62

Answers (1)

Leeroy Hannigan
Leeroy Hannigan

Reputation: 19693

Streams is not intended for just logging purpose and is very much used for business logic especially when coupled with Lambda as it provides a cost efficient mechanism for event driven architectures.

I would continue to use Streams as it suits your needs and is exactly what they are intended for.

Upvotes: 2

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