somod-chat-service/build/lib/threadCache.js

Serverless Chat Service from SOMOD

import { DynamoDBClient, GetItemCommand } from "@aws-sdk/client-dynamodb";
import { cache } from "./cache";
import { marshall, unmarshall } from "@aws-sdk/util-dynamodb";
const dynamodb = new DynamoDBClient();
const _threadCache = cache(100, 60 * 60000);
export const threadCache = {
    get: async (threadId, ttl) => {
        return await _threadCache.get(threadId, async () => {
            const threadResult = await dynamodb.send(new GetItemCommand({
                TableName: process.env.THREAD_TABLE_NAME,
                Key: marshall({ id: threadId })
            }));
            return threadResult.Item
                ? unmarshall(threadResult.Item)
                : undefined;
        }, ttl);
    }
};