@notross/mongo-singleton/esm/clients.js

A lightweight, zero-fuss way to get a single shared MongoDB connection across your Node.js codebase.

import { MongoSingleton } from './mongo-singleton';
class State {
    constructor() {
        this._clients = {};
        this.add = this.addClient.bind(this);
        this.set = this.setClient.bind(this);
        this.get = this.getClient.bind(this);
        this.clients = this._clients;
    }
    addClient(clientId, client) {
        if (this._clients[clientId]) {
            console.warn(`A client with ID ${clientId} already exists.`);
        }
        else {
            this.setClient({ [clientId]: client });
        }
    }
    setClient(client) {
        this._clients = { ...this._clients, ...client };
        this.clients = this._clients;
    }
    getClient(clientId) {
        return this._clients[clientId];
    }
    getClients() {
        return this._clients;
    }
}
const state = new State();
class Stateful {
    constructor(clientId, props) {
        this.set = this.update.bind(this);
        this.get = this.getClient.bind(this);
        this.clientId = clientId;
        this.client = state.get(clientId) || this.createClient(props);
    }
    createClient(props) {
        const client = new MongoSingleton(props);
        state.add(this.clientId, client);
        this.update(client);
        return client;
    }
    getClient() {
        return state.get(this.clientId);
    }
    update(value) {
        if (typeof value === 'function') {
            value = value(this.getClient());
        }
        state.set({ [this.clientId]: value });
        this.client = value;
    }
}
export const useClient = (clientId, props) => {
    const { client } = new Stateful(clientId, props);
    return {
        client,
        collection: client.collection,
        db: client.db,
    };
};
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