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import express from "express"; |
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const CACHE_LIFETIME = 30 * 1000; // 30 seconds in milliseconds |
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/** |
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* Manages client and bike connections with caching. |
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*/ |
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const clientManager = { |
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/** @type {Array<express.Response>} */ |
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clients: [], |
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/** |
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* @type {Object<string, {res: express.Response | null}>} |
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*/ |
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cachedBikeData: {}, |
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/** |
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* Adds a new client to the clients array. |
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* @param {express.Response} client - The client to add. |
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* |
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* @returns {void} |
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*/ |
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addClient(client) { |
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this.clients.push(client); |
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}, |
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/** |
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* Removes a client from the clients array. |
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* @param {express.Response} client - The client to remove. |
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* |
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* @returns {void} |
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*/ |
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removeClient(client) { |
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this.clients = this.clients.filter(c => c !== client); |
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}, |
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/** |
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* Initializes a new bike entry in the cache. |
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* @param {Number} bikeId - The bike ID. |
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* @param {express.Response} res - The bike connection response to add. |
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* |
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* @returns {void} |
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*/ |
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addBike(bikeId, res) { |
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this.cachedBikeData[bikeId] = { |
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res: res |
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}; |
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}, |
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/** |
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* Removes a bike's res key (and value) from the cache object |
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* @param {Number} bikeId - Id of the bike for which to set res to null |
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* |
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* @returns {void} |
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*/ |
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removeBike(bikeId) { |
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this.cachedBikeData[bikeId].res = null |
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}, |
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/** |
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* Broadcasts a message to all clients. |
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* @param {Object} message - The message to broadcast. |
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* |
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* @returns {void} |
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*/ |
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broadcastToClients(message) { |
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message = JSON.stringify(message) |
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this.clients.forEach(client => client.write(`data: ${message}\n\n`)); |
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}, |
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/** |
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* Broadcasts a message to a specific bike. |
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* @param {Number} bikeId - The ID of the bike to which the message should be broadcast. |
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* @param {Object} message - The message to broadcast. |
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* |
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* @returns {void} |
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*/ |
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broadcastToBikes(bikeId, message) { |
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message = JSON.stringify(message) |
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if (bikeId === -1) { |
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Object.values(this.cachedBikeData).forEach(bike => { |
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bike.res?.write(`data: ${message}\n\n`); |
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}); |
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return; |
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} |
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this.cachedBikeData[bikeId]?.res?.write(`data: ${message}\n\n`); |
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} |
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}; |
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export default clientManager; |
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JuliaLind /
vteam-server
