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105 lines
3.4 KiB
JavaScript
105 lines
3.4 KiB
JavaScript
8 months ago
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"use strict";
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var __importDefault = (this && this.__importDefault) || function (mod) {
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return (mod && mod.__esModule) ? mod : { "default": mod };
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};
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.Poller = exports.EVENTS = void 0;
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const debug_1 = __importDefault(require("debug"));
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const events_1 = require("events");
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const path_1 = require("path");
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const node_gyp_build_1 = __importDefault(require("node-gyp-build"));
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const errors_1 = require("./errors");
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const { Poller: PollerBindings } = (0, node_gyp_build_1.default)((0, path_1.join)(__dirname, '../'));
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const logger = (0, debug_1.default)('serialport/bindings-cpp/poller');
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exports.EVENTS = {
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UV_READABLE: 0b0001,
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UV_WRITABLE: 0b0010,
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UV_DISCONNECT: 0b0100,
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};
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function handleEvent(error, eventFlag) {
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if (error) {
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logger('error', error);
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this.emit('readable', error);
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this.emit('writable', error);
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this.emit('disconnect', error);
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return;
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}
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if (eventFlag & exports.EVENTS.UV_READABLE) {
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logger('received "readable"');
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this.emit('readable', null);
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}
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if (eventFlag & exports.EVENTS.UV_WRITABLE) {
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logger('received "writable"');
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this.emit('writable', null);
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}
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if (eventFlag & exports.EVENTS.UV_DISCONNECT) {
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logger('received "disconnect"');
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this.emit('disconnect', null);
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}
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}
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/**
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* Polls unix systems for readable or writable states of a file or serialport
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*/
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class Poller extends events_1.EventEmitter {
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constructor(fd, FDPoller = PollerBindings) {
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logger('Creating poller');
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super();
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this.poller = new FDPoller(fd, handleEvent.bind(this));
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}
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/**
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* Wait for the next event to occur
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* @param {string} event ('readable'|'writable'|'disconnect')
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* @returns {Poller} returns itself
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*/
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once(event, callback) {
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switch (event) {
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case 'readable':
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this.poll(exports.EVENTS.UV_READABLE);
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break;
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case 'writable':
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this.poll(exports.EVENTS.UV_WRITABLE);
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break;
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case 'disconnect':
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this.poll(exports.EVENTS.UV_DISCONNECT);
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break;
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}
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return super.once(event, callback);
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}
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/**
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* Ask the bindings to listen for an event, it is recommend to use `.once()` for easy use
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* @param {EVENTS} eventFlag polls for an event or group of events based upon a flag.
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*/
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poll(eventFlag = 0) {
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if (eventFlag & exports.EVENTS.UV_READABLE) {
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logger('Polling for "readable"');
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}
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if (eventFlag & exports.EVENTS.UV_WRITABLE) {
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logger('Polling for "writable"');
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}
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if (eventFlag & exports.EVENTS.UV_DISCONNECT) {
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logger('Polling for "disconnect"');
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}
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this.poller.poll(eventFlag);
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}
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/**
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* Stop listening for events and cancel all outstanding listening with an error
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*/
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stop() {
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logger('Stopping poller');
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this.poller.stop();
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this.emitCanceled();
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}
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destroy() {
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logger('Destroying poller');
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this.poller.destroy();
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this.emitCanceled();
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}
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emitCanceled() {
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const err = new errors_1.BindingsError('Canceled', { canceled: true });
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this.emit('readable', err);
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this.emit('writable', err);
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this.emit('disconnect', err);
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}
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}
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exports.Poller = Poller;
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