Add wrapEmitter to req and res, Improving debug mensages

Author: silva-fabio

packages/opencensus-core/src/trace/model/root-span.ts

@@ -71,7 +71,7 @@ export class RootSpan extends SpanBaseModel implements OnEndSpanEventListener {
     }
 
     public onEndSpan(span: Span) {
-        debug('%s notified ending by %o',{id: span.id, name: span.name})
+        debug('ended span notified  %o', {id: span.id, name: span.name})
     }
 
     public startSpan(name: string, type: string) {

packages/opencensus-core/src/trace/model/tracer.ts

@@ -78,13 +78,13 @@ export class Tracer implements OnEndSpanEventListener {
 
 
     public onEndSpan(root:RootSpan): void {
-        if (!this.currentRootSpan) {
+        if (!root) {
             return debug('cannot end trace - no active trace found')
         }
         if(this.currentRootSpan != root) {
-            return debug('currentRootSpan != root on notifyEnd. Possbile implementation bug.') 
+             debug('currentRootSpan != root on notifyEnd. Need more investigation.') 
         }
-        this.notifyEndSpan(this.currentRootSpan);
+        this.notifyEndSpan(root);
         //this.clearCurrentTrace();
     }
 
@@ -95,6 +95,7 @@ export class Tracer implements OnEndSpanEventListener {
 
     private notifyEndSpan(root: RootSpan) {
         if (this.active) {
+            debug ('starting to notify listeners the end of rootspans')
             if(this.eventListeners&&this.eventListeners.length >0) {
                 this.eventListeners.forEach((listener) => listener.onEndSpan(root))
             }