70 lines
1.4 KiB
JavaScript
70 lines
1.4 KiB
JavaScript
const EventEmitter = require("events");
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function log(...args) {
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console.log(Date.now(), ...args);
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}
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class Command extends EventEmitter {
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constructor(mpd) {
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super();
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this._mpd = mpd;
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this._buffer = Buffer.alloc(0);
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this._dataListener = data => this._onData(data);
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mpd.on("data", this._dataListener);
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}
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_onData(data) {
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log("<-- mpd", data);
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this._buffer = Buffer.concat([this._buffer, data]);
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this._processBuffer();
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}
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_processBuffer() {} // abstract
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_done(data) {
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this._mpd.off("data", this._dataListener);
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this.emit("done", data);
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}
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_getLine() {
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let index = this._buffer.indexOf(0x0a);
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if (index == -1) { return null; }
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let str = this._buffer.slice(0, index).toString("utf8");
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this._buffer = this._buffer.slice(index+1);
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return str;
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}
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}
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class Normal extends Command {
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constructor(mpd, command) {
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super(mpd);
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this._lines = [];
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log("--> mpd", command);
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mpd.write(command + "\n");
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}
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_processBuffer() {
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while (1) {
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let line = this._getLine();
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if (!line) { break; }
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this._lines.push(line);
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if (line.startsWith("OK") || line.startsWith("ACK")) { return this._done(this._lines); }
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}
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}
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}
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class Welcome extends Command {
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_processBuffer() {
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let line = this._getLine();
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if (line) { this._done(line); }
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}
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}
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exports.create = function(mpd, command) {
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return new Normal(mpd, command);
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}
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exports.welcome = function(mpd) {
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return new Welcome(mpd);
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}
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