Spy improvements

spy.js

@@ -1,6 +1,8 @@
 // Generic Spy
 
-function Spy() {
+function Spy(label, useJson) {
+    this.label = label || "SPY";
+    this.useJson = useJson;
 }
 
 Spy.prototype.boot = function () {
@@ -9,8 +11,20 @@ Spy.prototype.boot = function () {
 
 Spy.prototype.handleEvent = function (e) {
     switch (e.type) {
-    case "routes": console.log("SPY", "routes", e.routes); break;
-    case "message": console.log("SPY", "message", e.message, e.metaLevel, e.isFeedback); break;
-    default: console.log("SPY", "unknown", e); break;
+    case "routes":
+	console.log(this.label, "routes", this.useJson ? JSON.stringify(e.routes) : e.routes);
+	break;
+    case "message":
+	var messageRepr;
+	try {
+	    messageRepr = this.useJson ? JSON.stringify(e.message) : e.message;
+	} catch (exn) {
+	    messageRepr = e.message;
+	}
+	console.log(this.label, "message", messageRepr, e.metaLevel, e.isFeedback);
+	break;
+    default:
+	console.log(this.label, "unknown", e);
+	break;
     }
 };