Connection ID Not getting deleted in dynamo Db table when using websocket API.

Question

I have a created a websocket api and the routes to connect and disconnect is set to lambda functions which put connection id to a dynamo db table and delete it respectively. But when the client connection to the websocket is terminated unexpectedly ( device shutdown, wifi/data turn off etc) the client id is not deleted automatically. What can i do to avoid this and make sure if a client is disconnected in any way i have the connection id deleted? Please provide code layout if applicable.

Answer

Hello Phoenix2819,

I think you are missing step 8 and 9 described in the  AWS blog here - [Managing sessions of anonymous users in WebSocket API-based applications](https://aws.amazon.com/blogs/compute/managing-sessions-of-anonymous-users-in-websocket-api-based-applications/)

The sample code is provided in the blog link above which uses EventBridge to schedule OnDelete function execution every 5 minutes.

Step 8 - If the connection breaks, the WebSocket API calls the OnDisconnect Lambda function automatically. The function marks the connection ID for the given user ID as inactive.

Step 9 - If the user does not return within 5 minutes, Amazon EventBridge scheduler invokes the OnDelete Lambda function, which deletes items with more than 5 minutes of inactivity from Connections and Sessions tables.

Connection ID Not getting deleted in dynamo Db table when using websocket API.

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