62 lines
1.3 KiB
JavaScript
62 lines
1.3 KiB
JavaScript
import * as parser from "./parser.js";
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let ws;
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let commandQueue = [];
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let pendingResolve;
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function onMessage(e) {
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if (pendingResolve) {
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pendingResolve(JSON.parse(e.data)); // FIXME tady test na ACK
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pendingResolve = null;
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}
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processQueue();
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}
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function onError(e) {
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console.error(e);
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ws = null; // fixme
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}
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function onClose(e) {
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console.warn(e);
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ws = null; // fixme
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}
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function processQueue() {
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if (pendingResolve || commandQueue.length == 0) { return; }
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let {cmd, resolve} = commandQueue.shift();
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pendingResolve = resolve;
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if (cmd instanceof Array) { cmd = ["command_list_begin", ...cmd, "command_list_end"].join("\n"); }
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ws.send(cmd);
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}
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export function escape(str) {
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return str.replace(/(['"\\])/g, "\\$1");
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}
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export async function command(cmd) {
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return new Promise(resolve => {
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commandQueue.push({cmd, resolve});
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processQueue();
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});
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}
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export async function getStatus() {
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let lines = await command(["status", "currentsong"]);
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lines.pop(); // "OK"
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return parser.linesToStruct(lines);
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}
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export async function init() {
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return new Promise((resolve, reject) => {
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try {
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ws = new WebSocket("ws://localhost:8080?server=raspberrypi.local");
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} catch (e) { reject(e); }
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pendingResolve = resolve;
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ws.addEventListener("error", onError);
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ws.addEventListener("message", onMessage);
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ws.addEventListener("close", onClose);
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});
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}
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