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178 lines (141 loc) · 4.09 KB
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+(function (scope) {
'use strict';
var push = Array.prototype.push;
var Transport = scope.Transport,
TransportEvent = scope.TransportEvent,
util = scope.util,
proto;
var STATUS = {
OK: 'OK'
};
var TOPIC = {
PING: '/PING',
PONG: '/PONG',
STATUS: '/STATUS'
};
function MessageTransport(options) {
Transport.call(this, options);
this._options = options;
this._client = null;
this._timer = null;
this._sendTimer = null;
this._buf = [];
this._status = '';
this._connHandler = onConnect.bind(this);
this._messageHandler = onMessage.bind(this);
this._sendOutHandler = sendOut.bind(this);
init(this);
}
function init(self) {
// 這個是拋送訊息用。
// 而用自身的 window 來做資料的接收
self._window = self._options.window || window;
// messageTransport 拋送的通道，固定有 transport: true 來做識別
self._window.postMessage({
transport: true,
transportReady: true
}, location.origin);
window.addEventListener('message', function checkConnect(evt) {
var data = evt.data;
if (evt.origin !== location.origin) return;
if (!data.transport) return;
if (evt.source !== self._window) {
// 這裡一定是相同的，不同就有問題了
console.error('message transport 接收訊息有問題');
return;
}
if (data.transportReady) {
evt.source.postMessage({
transport: true,
transportGo: true
}, location.origin);
window.removeEventListener('message', checkConnect);
self._connHandler();
}
});
}
function onConnect() {
window.addEventListener("message", this._messageHandler, false);
this.isOpen = true;
}
function onMessage(event) {
var message = event.data;
if (event.origin !== location.origin) return;
if (!message.transport) return;
var dest = message.destinationName
var oldStatus = this._status;
var subscribe = [this._options.device + TOPIC.PONG, this._options.device + TOPIC.STATUS]
if (subscribe.indexOf(dest) === -1) {
return;
}
switch (dest.substr(dest.lastIndexOf('/') + 1)) {
case 'STATUS':
this._status = message.payloadString;
detectStatusChange(this, this._status, oldStatus);
break;
default:
(this._status === STATUS.OK) && this.emit(TransportEvent.MESSAGE, message.payloadBytes);
break;
}
}
function detectStatusChange(self, newStatus, oldStatus) {
if (newStatus === oldStatus) {
return;
}
if (newStatus === STATUS.OK) {
self.emit(TransportEvent.OPEN);
} else {
self.emit(TransportEvent.ERROR, new Error('board connection failed.'));
}
}
function sendOut() {
if (this.isOpen) {
this._window.postMessage({
transport: true,
destinationName: this._options.device + TOPIC.PING,
payloadBytes: new Uint8Array(this._buf)
}, location.origin);
}
clearBuf(this);
}
function clearBuf(self) {
self._buf = [];
clearImmediate(self._sendTimer);
self._sendTimer = null;
}
MessageTransport.prototype = proto = Object.create(Transport.prototype, {
constructor: {
value: MessageTransport
},
isOpen: {
get: function () {
return this._isOpen;
},
set: function (val) {
this._isOpen = val;
}
}
});
proto.send = function (payload) {
if (this._buf.length + payload.length + this._options.device.length + TOPIC.PING.length + 4 >
MessageTransport.MAX_PACKET_SIZE) {
this._sendOutHandler();
}
push.apply(this._buf, payload);
if (!this._sendTimer) {
this._sendTimer = setImmediate(this._sendOutHandler);
}
};
proto.close = function () {
window.removeEventListener("message", this._messageHandler);
delete this._window;
delete this._options;
this.isOpen = false;
};
proto.flush = function () {
if (this._buf && this._buf.length) {
this._sendOutHandler();
}
};
scope.transport.message = MessageTransport;
}(webduino));