adding a mechanism to quickly check the server log

lib/cloud_crowd/server.rb

@@ -14,7 +14,7 @@ module CloudCrowd
   # [delete /jobs/:job_id] Clean up a Job when you're done downloading the results. Removes all intermediate files.
   #
   # == Internal Workers API
-  # [puts /node/:host] Registers a new Node, making it available for processing.
+  # [put /node/:host] Registers a new Node, making it available for processing.
   # [delete /node/:host] Removes a Node from the registry, freeing up any WorkUnits that it had checked out.
   # [put /work/:unit_id] Mark a finished WorkUnit as completed or failed, with results.
   class Server < Sinatra::Base
@@ -48,6 +48,11 @@ class Server < Sinatra::Base
       )
     end
 
+    # Get the last 100 lines of log messages.
+    get '/log' do
+      `tail -n 100 #{CloudCrowd.log_path('server.log')}`
+    end
+
     # Get the JSON for what a worker is up to.
     get '/worker/:name' do
       json WorkUnit.find_by_worker_name(params[:name]) || {}

public/css/admin_console.css

@@ -91,11 +91,17 @@ body {
     }
   #sidebar_header {
     position: absolute;
-    width: 250px;
+    width: 283px;
     top: 5px; left: 8px;
     color: #404040;
     text-shadow: 0px 1px 1px #eee;
   }
+    #tail_log {
+      text-transform: none;
+      text-decoration: underline;
+      cursor: pointer;
+      float: right;
+    }
     #sidebar_header.no_nodes .no_nodes,
     #sidebar_header .has_nodes {
       display: block;

public/js/admin_console.js

@@ -47,6 +47,7 @@ window.Console = {
     this._disconnected = $('#disconnected');
     $(window).bind('resize', Console.renderGraphs);
     $('#nodes .worker').live('click', Console.getWorkerInfo);
+    $('#tail_log').bind('click', Console.tailLog);
     $('#workers_legend').css({background : this.WORKERS_COLOR});
     $('#nodes_legend').css({background : this.NODES_COLOR});
     this.getStatus();
@@ -73,6 +74,16 @@ window.Console = {
     }});
   },
 
+  // Fetch the last 100 lines of log from the server.
+  tailLog : function() {
+    $.ajax({url : 'log', success : function(resp) {
+      var win = window.open('');
+      win.document.open();
+      win.document.write('<pre>' + resp + '</pre>');
+      win.document.close();
+    }});
+  },
+
   // Count the total number of workers in the current list of nodes.
   countWorkers : function() {
     var sum = 0;

views/operations_center.erb

@@ -48,6 +48,7 @@
       <div id="sidebar_background"></div>
       <div id="sidebar_bottom" class="sidebar_back"></div>
       <div id="sidebar_header" class="small_caps">
+        <span id="tail_log">Check Server Log</span>
         <span class="has_nodes"></span>
         <span class="no_nodes">No Nodes Online&hellip;</span>
       </div>