From ace717d6e47f600578ef4850bc92a1e5243bcf81 Mon Sep 17 00:00:00 2001
From: xdrm-brackets <doowap31@gmail.com>
Date: Wed, 29 Nov 2017 20:36:30 +0100
Subject: [PATCH] add:view.lib.ws-client.js (WebSocket Client in
 javascript.es6)

---
 view/lib/ws-client-es6.js | 201 ++++++++++++++++++++++++++++++++++++++
 view/main.js              |   2 +
 2 files changed, 203 insertions(+)
 create mode 100644 view/lib/ws-client-es6.js

diff --git a/view/lib/ws-client-es6.js b/view/lib/ws-client-es6.js
new file mode 100644
index 0000000..5d95fe0
--- /dev/null
+++ b/view/lib/ws-client-es6.js
@@ -0,0 +1,201 @@
+/* classe client WebSocket */
+class WSClient{
+
+	/* (1) Constructor
+	*
+	* @server_url<String>				The url of the desired server
+	* @channel_uri<String>				The url of the desired channel
+	*
+	---------------------------------------------------------*/
+	constructor(server_url, channel_uri){
+
+		/* (1) Store & create data
+		---------------------------------------------------------*/
+		/* (1) Store the arguments */
+		this.server_url  = server_url;
+		this.channel_uri = channel_uri;
+
+		/* (2) Initialise event data */
+		this.is_opened = false; // Set to TRUE when connection opened
+		this.pending   = null;  // Next message to send through connection
+		this.handler   = [];    // On reveice handlers
+
+		/* (3) Create the websocket connection */
+		this.ws = new WebSocket(this.server_url+'/'+channel_uri);
+
+
+		/* (2) Bind events
+		---------------------------------------------------------*/
+		/* (1) OPEN: when connection is established */
+		this.ws.onopen = this._onopen.bind(this);
+
+		/* (2) MESSAGE: when message received */
+		this.ws.onmessage = this._onmessage.bind(this);
+
+		/* (3) ERROR: when websocket error */
+		this.ws.onerror = this._onerror.bind(this);
+
+		/* (4) CLOSE: when websocket closes */
+		this.ws.onclose = this._onclose.bind(this);
+
+	}
+
+
+	/* (2) Binds a handle to the onReceive event (global only)
+	*
+	* @callback<Function>				Callback function(message, error)
+	*
+	---------------------------------------------------------*/
+	listen(callback){
+
+		/* (1) Check @callback type (default value) */
+		if( !(callback instanceof Function) )
+			throw new Error('WSClient.bind(callback) expected argument *callback* to be a function');
+
+		/* (2) Store callback */
+		this.on_receive = callback;
+
+		return this;
+
+	}
+
+
+	/* (3) Sends a message through the socket
+	*
+	* @message<String>					The data to send
+	* 		  <Object>					The data to send (will be serialized)
+	*
+	---------------------------------------------------------*/
+	send(message){
+
+		/* (1) Manage arguments
+		---------------------------------------------------------*/
+		/* (2) Check @message type */
+		if( typeof message != 'string' && typeof message != 'object' ){
+			this.on_receive(null, 'wrong message type');
+			return this;
+		}
+
+		/* (2) Stringify JSON if object */
+		if( typeof message == 'object' )
+			message = JSON.stringify(message);
+
+
+		/* (2) Send process
+		---------------------------------------------------------*/
+		/* (1) If not opened -> store message (will send when onopen()) */
+		if( !this.is_opened )
+			this.pending = message;
+
+		/* (2) If already opened -> send now */
+		else
+			this.ws.send(message);
+
+		return this;
+
+	}
+
+
+	/* (4) PRIVATE: Open handler
+	*
+	---------------------------------------------------------*/
+	_onopen(){
+
+		/* (1) Set @is_opened status variable */
+		this.is_opened = true;
+
+		/* (2) If message pending */
+		if( this.pending != null ){
+
+			this.ws.send(this.pending); // send message
+			this.pending = null;        // reset message (optional)
+
+		}
+
+	}
+
+
+	/* (5) PRIVATE: Receive handler
+	*
+	---------------------------------------------------------*/
+	_onmessage(msg_event){
+
+		/* (1) If not trusted -> error */
+		if( !msg_event.isTrusted ){
+			this.on_receive(null, 'not trusted');
+			return;
+		}
+
+		/* (2) If wrong origin -> error */
+		if( msg_event.origin != this.server_url ){
+			this.on_receive(null, 'unknown origin');
+			return;
+		}
+
+		/* (3) If all right -> success */
+		this.on_receive(msg_event.data, null);
+
+	}
+
+
+	/* (6) PRIVATE: Error handler
+	*
+	---------------------------------------------------------*/
+	_onerror(){
+
+		/* (1) Remove other handlers (only 1 error) */
+		this.ws.onmessage = null;
+		this.ws.onclose   = null;
+
+		/* (2) Send error */
+		this.on_receive(null, 'websocket error');
+
+	}
+
+
+	/* (7) PRIVATE: Close handler
+	*
+	---------------------------------------------------------*/
+	_onclose(){
+
+		/* (1) Remove onmessage (not to catch messages) */
+		this.ws.onmessage = null;
+
+		/* (2) Send end */
+		this.on_receive(null, 'websocket closed');
+
+	}
+
+}
+
+
+
+
+class WSClientBuilder{
+
+	/* (1) Constructor
+	*
+	* @server_url<String>				The url of the desired server
+	*
+	---------------------------------------------------------*/
+	constructor(server_url){
+		/* (1) Store the server url */
+		this.server_url = server_url;
+	}
+
+
+	/* (2) Builds a WSClient with desired channel
+	*
+	* @channel_uri<String>				The uri of the desired channel
+	*
+	---------------------------------------------------------*/
+	channel(channel_uri=''){
+		return new WSClient(this.server_url, channel_uri);
+	}
+
+}
+
+
+
+
+export{ WSClient, WSClientBuilder }
\ No newline at end of file
diff --git a/view/main.js b/view/main.js
index ee0ec81..dc0d917 100755
--- a/view/main.js
+++ b/view/main.js
@@ -5,6 +5,7 @@ import Vue from 'vue'
 
 /* (2) Internal libs */
 import {API} from './lib/api-es6'
+import {WSClient,WSClientBuilder} from './lib/ws-client-es6'
 
 /* (3) Vues */
 import main_vue from './vue/main.vue'
@@ -17,6 +18,7 @@ window.api = new API("http://ndli1718/api/v/1.0/");
 
 /* (2) wsclient */
 //todo: init websocket client
+window.wsc = new WSClientBuilder("wss://websocket.xdrm.io");
 
 /* (3) Render view */