'use strict';
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var Stream = require('stream').Stream,
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util = require('util'),
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driver = require('websocket-driver'),
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EventTarget = require('./api/event_target'),
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Event = require('./api/event');
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var API = function(options) {
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options = options || {};
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driver.validateOptions(options, ['headers', 'extensions', 'maxLength', 'ping', 'proxy', 'tls', 'ca']);
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this.readable = this.writable = true;
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var headers = options.headers;
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if (headers) {
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for (var name in headers) this._driver.setHeader(name, headers[name]);
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}
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var extensions = options.extensions;
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if (extensions) {
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[].concat(extensions).forEach(this._driver.addExtension, this._driver);
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}
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this._ping = options.ping;
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this._pingId = 0;
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this.readyState = API.CONNECTING;
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this.bufferedAmount = 0;
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this.protocol = '';
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this.url = this._driver.url;
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this.version = this._driver.version;
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var self = this;
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this._driver.on('open', function(e) { self._open() });
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this._driver.on('message', function(e) { self._receiveMessage(e.data) });
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this._driver.on('close', function(e) { self._beginClose(e.reason, e.code) });
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this._driver.on('error', function(error) {
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self._emitError(error.message);
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});
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this.on('error', function() {});
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this._driver.messages.on('drain', function() {
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self.emit('drain');
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});
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if (this._ping)
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this._pingTimer = setInterval(function() {
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self._pingId += 1;
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self.ping(self._pingId.toString());
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}, this._ping * 1000);
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this._configureStream();
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if (!this._proxy) {
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this._stream.pipe(this._driver.io);
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this._driver.io.pipe(this._stream);
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}
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};
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util.inherits(API, Stream);
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API.CONNECTING = 0;
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API.OPEN = 1;
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API.CLOSING = 2;
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API.CLOSED = 3;
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API.CLOSE_TIMEOUT = 30000;
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var instance = {
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write: function(data) {
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return this.send(data);
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},
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end: function(data) {
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if (data !== undefined) this.send(data);
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this.close();
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},
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pause: function() {
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return this._driver.messages.pause();
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},
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resume: function() {
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return this._driver.messages.resume();
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},
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send: function(data) {
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if (this.readyState > API.OPEN) return false;
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if (!(data instanceof Buffer)) data = String(data);
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return this._driver.messages.write(data);
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},
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ping: function(message, callback) {
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if (this.readyState > API.OPEN) return false;
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return this._driver.ping(message, callback);
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},
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close: function(code, reason) {
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if (code === undefined) code = 1000;
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if (reason === undefined) reason = '';
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if (code !== 1000 && (code < 3000 || code > 4999))
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throw new Error("Failed to execute 'close' on WebSocket: " +
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"The code must be either 1000, or between 3000 and 4999. " +
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code + " is neither.");
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if (this.readyState < API.CLOSING) {
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var self = this;
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this._closeTimer = setTimeout(function() {
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self._beginClose('', 1006);
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}, API.CLOSE_TIMEOUT);
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}
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if (this.readyState !== API.CLOSED) this.readyState = API.CLOSING;
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this._driver.close(reason, code);
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},
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_configureStream: function() {
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var self = this;
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this._stream.setTimeout(0);
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this._stream.setNoDelay(true);
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['close', 'end'].forEach(function(event) {
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this._stream.on(event, function() { self._finalizeClose() });
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}, this);
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this._stream.on('error', function(error) {
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self._emitError('Network error: ' + self.url + ': ' + error.message);
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self._finalizeClose();
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});
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},
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_open: function() {
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if (this.readyState !== API.CONNECTING) return;
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this.readyState = API.OPEN;
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this.protocol = this._driver.protocol || '';
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var event = new Event('open');
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event.initEvent('open', false, false);
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this.dispatchEvent(event);
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},
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_receiveMessage: function(data) {
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if (this.readyState > API.OPEN) return false;
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if (this.readable) this.emit('data', data);
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var event = new Event('message', { data: data });
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event.initEvent('message', false, false);
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this.dispatchEvent(event);
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},
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_emitError: function(message) {
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if (this.readyState >= API.CLOSING) return;
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var event = new Event('error', { message: message });
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event.initEvent('error', false, false);
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this.dispatchEvent(event);
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},
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_beginClose: function(reason, code) {
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if (this.readyState === API.CLOSED) return;
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this.readyState = API.CLOSING;
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this._closeParams = [reason, code];
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if (this._stream) {
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this._stream.destroy();
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if (!this._stream.readable) this._finalizeClose();
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}
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},
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_finalizeClose: function() {
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if (this.readyState === API.CLOSED) return;
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this.readyState = API.CLOSED;
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if (this._closeTimer) clearTimeout(this._closeTimer);
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if (this._pingTimer) clearInterval(this._pingTimer);
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if (this._stream) this._stream.end();
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if (this.readable) this.emit('end');
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this.readable = this.writable = false;
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var reason = this._closeParams ? this._closeParams[0] : '',
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code = this._closeParams ? this._closeParams[1] : 1006;
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var event = new Event('close', { code: code, reason: reason });
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event.initEvent('close', false, false);
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this.dispatchEvent(event);
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}
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};
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for (var method in instance) API.prototype[method] = instance[method];
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for (var key in EventTarget) API.prototype[key] = EventTarget[key];
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module.exports = API;
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