Adds checking of template error

go/src/infra/tricium/service/workflow-launcher/handlers.go

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Package handlers implements HTTP handlers for the workflow-launcher module.
 package handlers
 
 import (
         "html/template"
         "net/http"
 
         "google.golang.org/appengine"
         "google.golang.org/appengine/taskqueue"
 )
 
 func init() {
         http.HandleFunc("/workflow-launcher/status", statusPageHandler)
         http.HandleFunc("/workflow-launcher/queue-handler", queueHandler)
 }
 
 var basePage = template.Must(template.ParseFiles("templates/base.html"))
 
 func statusPageHandler(w http.ResponseWriter, r *http.Request) {
         // TODO(emso): Add workflow launcher stats
         data := map[string]interface{}{
                 "Msg": "Status of the Workflow Launcher ...",
         }
-        basePage.Execute(w, data)
+        if e := basePage.Execute(w, data); e != nil {
+                http.Error(w, e.Error(), http.StatusInternalServerError)
+                return
+        }
 }
 
 func queueHandler(w http.ResponseWriter, r *http.Request) {
         ctx := appengine.NewContext(r)
 
         // TODO(emso): Process request (merge configs, compute workflow) and launch workflow
 
         // Enqueue workflow listener task
         t := taskqueue.NewPOSTTask("/workflow-listener/queue-handler", map[string][]string{"name": {"Workflow Launched"}})
-        if _, err := taskqueue.Add(ctx, t, "workflow-listener-queue"); err != nil {
-                http.Error(w, err.Error(), http.StatusInternalServerError)
+        if _, e := taskqueue.Add(ctx, t, "workflow-listener-queue"); e != nil {
+                http.Error(w, e.Error(), http.StatusInternalServerError)
                 return
         }
 }