129 lines
2.7 KiB
JavaScript
129 lines
2.7 KiB
JavaScript
const EventEmitter = require("events");
|
|
|
|
function log(...args) {
|
|
console.log(Date.now(), ...args);
|
|
}
|
|
|
|
class Command extends EventEmitter {
|
|
constructor(mpd) {
|
|
super();
|
|
this._mpd = mpd;
|
|
this._buffer = Buffer.alloc(0);
|
|
this._dataListener = data => this._onData(data);
|
|
mpd.on("data", this._dataListener);
|
|
}
|
|
|
|
_onData(data) {
|
|
log("<-- mpd", data);
|
|
this._buffer = Buffer.concat([this._buffer, data]);
|
|
this._processBuffer();
|
|
}
|
|
|
|
_processBuffer() {} // abstract
|
|
|
|
_done(data) {
|
|
this._mpd.off("data", this._dataListener);
|
|
this._buffer = null;
|
|
this.emit("done", data);
|
|
}
|
|
|
|
_getLine() {
|
|
let index = this._buffer.indexOf(0x0a);
|
|
if (index == -1) { return null; }
|
|
let str = this._buffer.slice(0, index).toString("utf8");
|
|
this._buffer = this._buffer.slice(index+1);
|
|
return str;
|
|
}
|
|
}
|
|
|
|
class Normal extends Command {
|
|
constructor(mpd, command) {
|
|
super(mpd);
|
|
this._lines = [];
|
|
log("--> mpd", command);
|
|
mpd.write(command + "\n");
|
|
}
|
|
|
|
_processBuffer() {
|
|
while (1) {
|
|
let line = this._getLine();
|
|
if (!line) { break; }
|
|
this._lines.push(line);
|
|
if (line.startsWith("OK") || line.startsWith("ACK")) { return this._done(this._lines); }
|
|
}
|
|
}
|
|
}
|
|
|
|
class Welcome extends Command {
|
|
_processBuffer() {
|
|
let line = this._getLine();
|
|
if (line) { this._done([line]); }
|
|
}
|
|
}
|
|
|
|
class AlbumArt extends Command {
|
|
constructor(mpd, command) {
|
|
super(mpd);
|
|
this._size = 0;
|
|
this._binary = 0;
|
|
this._data = null;
|
|
this._lines = [];
|
|
|
|
log("--> mpd", command);
|
|
mpd.write(command + "\n");
|
|
}
|
|
|
|
_processBuffer() {
|
|
if (!this._size) {
|
|
let line = this._getLine();
|
|
if (!line) { return; }
|
|
this._lines.push(line);
|
|
|
|
if (line.startsWith("ACK")) { // no art!
|
|
this._done(this._lines);
|
|
return;
|
|
}
|
|
|
|
this._size = Number(line.split(": ").pop());
|
|
log("size", this._size);
|
|
}
|
|
|
|
if (!this._binary) {
|
|
let line = this._getLine();
|
|
if (!line) { return; }
|
|
this._lines.push(line);
|
|
this._binary = Number(line.split(": ").pop());
|
|
log("binary", this._binary);
|
|
}
|
|
|
|
if (!this._data) {
|
|
// binary data has this._binary bytes + 1 newline
|
|
if (this._buffer.length >= this._binary+1) {
|
|
this._data = this._buffer.slice(0, this._binary);
|
|
this._buffer = this._buffer.slice(this._binary+1);
|
|
this._lines.push([...this._data]);
|
|
log("data", this._data.length);
|
|
} else { return; }
|
|
}
|
|
|
|
let line = this._getLine();
|
|
if (!line) { return; }
|
|
this._lines.push(line);
|
|
this._done(this._lines);
|
|
}
|
|
|
|
}
|
|
|
|
exports.create = function(mpd, command) {
|
|
if (command.startsWith("albumart")) {
|
|
return new AlbumArt(mpd, command);
|
|
} else {
|
|
return new Normal(mpd, command);
|
|
}
|
|
return new Normal(mpd, command);
|
|
}
|
|
|
|
exports.welcome = function(mpd) {
|
|
return new Welcome(mpd);
|
|
}
|