import * as parser from "./parser.js"; let ws; let commandQueue = []; let current; function onMessage(e) { if (current) { let lines = JSON.parse(e.data); let last = lines.pop(); if (last.startsWith("OK")) { current.resolve(lines); } else { console.warn(last); current.reject(last); } current = null; } processQueue(); } function onError(e) { console.error(e); current && current.reject(e); ws = null; // fixme } function onClose(e) { console.warn(e); current && current.reject(e); ws = null; // fixme } function processQueue() { if (current || commandQueue.length == 0) { return; } current = commandQueue.shift(); ws.send(current.cmd); } export function serializeFilter(filter) { let tokens = ["("]; Object.entries(filter).forEach(([key, value], index) => { index && tokens.push(" AND "); tokens.push(`(${key} == "${escape(value)}")`); }); tokens.push(")"); let filterStr = tokens.join(""); return `"${escape(filterStr)}"`; } export function escape(str) { return str.replace(/(['"\\])/g, "\\$1"); } export async function command(cmd) { if (cmd instanceof Array) { cmd = ["command_list_begin", ...cmd, "command_list_end"].join("\n"); } return new Promise((resolve, reject) => { commandQueue.push({cmd, resolve, reject}); processQueue(); }); } export async function commandAndStatus(cmd) { let lines = await command([cmd, "status", "currentsong"]); let status = parser.linesToStruct(lines); if (status["duration"] instanceof Array) { status["duration"] = status["duration"][0]; } return status; } export async function status() { let lines = await command(["status", "currentsong"]); let status = parser.linesToStruct(lines); if (status["duration"] instanceof Array) { status["duration"] = status["duration"][0]; } return status; } export async function listQueue() { let lines = await command("playlistinfo"); return parser.songList(lines); } export async function listPlaylists() { let lines = await command("listplaylists"); let parsed = parser.linesToStruct(lines); let list = parsed["playlist"]; if (!list) { return []; } return (list instanceof Array ? list : [list]); } export async function listPath(path) { let lines = await command(`lsinfo "${escape(path)}"`); return parser.pathContents(lines); } export async function listTags(tag, filter = null) { let tokens = ["list", tag]; if (filter) { tokens.push(serializeFilter(filter)); let fakeGroup = Object.keys(filter)[0]; // FIXME hack for MPD < 0.21.6 tokens.push("group", fakeGroup); } let lines = await command(tokens.join(" ")); let parsed = parser.linesToStruct(lines); return [].concat(tag in parsed ? parsed[tag] : []); } export async function listSongs(filter, window = null) { let tokens = ["find"]; tokens.push(serializeFilter(filter)); if (window) { tokens.push("window", window.join(":")); } let lines = await command(tokens.join(" ")); return parser.songList(lines); } export async function albumArt(songUrl) { let data = []; let offset = 0; while (1) { let params = ["albumart", `"${escape(songUrl)}"`, offset]; let lines = await command(params.join(" ")); data = data.concat(lines[2]); let metadata = parser.linesToStruct(lines.slice(0, 2)); if (data.length >= Number(metadata["size"])) { return data; } offset += Number(metadata["binary"]); } return null; } export async function init() { let response = await fetch("/ticket", {method:"POST"}); let ticket = (await response.json()).ticket; return new Promise((resolve, reject) => { try { let url = new URL(location.href); url.protocol = "ws"; url.hash = ""; url.searchParams.set("ticket", ticket); ws = new WebSocket(url.href); } catch (e) { reject(e); } current = {resolve, reject}; ws.addEventListener("error", onError); ws.addEventListener("message", onMessage); ws.addEventListener("close", onClose); }); }