optimize web socket interface, add some test case for ws

lib/wsServer.js

@@ -23,23 +23,18 @@ function resToMsg(msg,cb){
     }
 
     if(jsonData.type == "reqBody" && jsonData.id){
+        result.type ="body";
         GLOBAL.recorder.getBodyUTF8(jsonData.id, function(err, data){
             if(err){
-                result = {
-                    type : "body",
-                    content : {
-                        id    : null,
-                        body  : null,
-                        error : err.toString()
-                    }
+                result.content = {
+                    id    : null,
+                    body  : null,
+                    error : err.toString()
                 };    
             }else{
-                result = {
-                    type : "body",
-                    content : {
-                        id   : jsonData.id,
-                        body : data
-                    }
+                result.content = {
+                    id   : jsonData.id,
+                    body : data
                 };
             }
             cb && cb(result);
@@ -75,13 +70,22 @@ function wsServer(config){
 	    });
 	});
 
+    wss.on("close",function(){});
+
 	GLOBAL.recorder.on("update",function(data){
-	    wss && wss.broadcast({
-	        type   : "update",
-	        content: data
-	    });
+        try{
+    	    wss && wss.broadcast({
+    	        type   : "update",
+    	        content: data
+    	    });
+        }catch(e){
+            console.log("ws error");
+            console.log(e);
+        }
 	});
 
+    //Iconv-lite warning: decode()-ing strings is deprecated. Refer to https://github.com/ashtuchkin/iconv-lite/wiki/Use-Buffers-when-decoding
+    
 	return wss;
 }