@arturwojnar/hermes-mongodb/lib/getConsumer.js

Production-Ready TypeScript Outbox Pattern for MongoDB

import { assert } from '@arturwojnar/hermes';
import { ObjectId } from 'mongodb';
import { OutboxConsumersCollectionName } from './consts.js';
const getConsumer = async (db, partitionKey) => {
    const consumers = db.collection(OutboxConsumersCollectionName);
    let consumer = await consumers.findOne({ partitionKey });
    if (!consumer) {
        consumer = {
            _id: new ObjectId(),
            lastProcessedId: null,
            resumeToken: undefined,
            partitionKey,
            lastUpdatedAt: null,
            createdAt: new Date(),
        };
        await consumers.insertOne(consumer);
    }
    const that = {
        async update(lastProcessedId, resumeToken) {
            assert(consumer);
            const { modifiedCount } = await consumers.updateOne({ _id: that._id }, { $set: { lastProcessedId, resumeToken, lastUpdatedAt: new Date() } });
            if (!modifiedCount) {
                throw new Error(`Cant update the consumer ${that._id.toString()}.`);
            }
            consumer.lastProcessedId = lastProcessedId;
            consumer.resumeToken = resumeToken;
        },
        async delete() {
            await consumers.deleteOne({ _id: that._id });
        },
        ...consumer,
    };
    return that;
};
export { getConsumer };
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