cyp/app/js/mpd.js
2020-03-14 16:15:14 +01:00

161 lines
4.1 KiB
JavaScript

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, operator = "==") {
let tokens = ["("];
Object.entries(filter).forEach(([key, value], index) => {
index && tokens.push(" AND ");
tokens.push(`(${key} ${operator} "${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 "${escape(path)}"`);
return parser.pathContents(lines);
}
export async function listTags(tag, filter = {}) {
let tokens = ["list", tag];
if (Object.keys(filter).length) {
tokens.push(serializeFilter(filter));
let fakeGroup = Object.keys(filter)[0]; // FIXME hack for MPD < 0.21.6
tokens.push("group", fakeGroup);
}
let lines = await command(tokens.join(" "));
let parsed = parser.linesToStruct(lines);
return [].concat(tag in parsed ? parsed[tag] : []);
}
export async function listSongs(filter, window = null) {
let tokens = ["find", serializeFilter(filter)];
window && tokens.push("window", window.join(":"));
let lines = await command(tokens.join(" "));
return parser.songList(lines);
}
export async function searchSongs(filter) {
let tokens = ["search", serializeFilter(filter, "contains")];
let lines = await command(tokens.join(" "));
return parser.songList(lines);
}
export async function albumArt(songUrl) {
let data = [];
let offset = 0;
let params = ["albumart", `"${escape(songUrl)}"`, offset];
while (1) {
params[2] = offset;
try {
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"]);
} catch (e) { return null; }
}
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);
});
}