adding a clear button to elm

src/Microsoft.AspNet.Diagnostics.Elm/ElmPageMiddleware.cs

@@ -36,7 +36,13 @@ namespace Microsoft.AspNet.Diagnostics.Elm
                 return;
             }
 
-            var options = ParseParams(context);
+            var t = await ParseParams(context);
+            var options = t.Item1;
+            var redirect = t.Item2;
+            if (redirect)
+            {
+                return;
+            }
             if (context.Request.Path == _options.Path)
             {
                 RenderMainLogPage(options, context);
@@ -81,27 +87,38 @@ namespace Microsoft.AspNet.Diagnostics.Elm
             await requestPage.ExecuteAsync(context);
         }
 
-        private ViewOptions ParseParams(HttpContext context)
+        private async Task<Tuple<ViewOptions, bool>> ParseParams(HttpContext context)
         {
             var options = new ViewOptions()
             {
                 MinLevel = LogLevel.Verbose,
                 NamePrefix = string.Empty
             };
-            if (context.Request.Query.ContainsKey("level"))
+            var isRedirect = false;
+            var form = await context.Request.GetFormAsync();
+            if (form.ContainsKey("clear"))
             {
-                var minLevel = options.MinLevel;
+                _store.Clear();
-                if (Enum.TryParse<LogLevel>(context.Request.Query["level"], out minLevel))
+                context.Response.Redirect(context.Request.PathBase.Add(_options.Path).ToString());
+                isRedirect = true;
+            }
+            else
+            {
+                if (context.Request.Query.ContainsKey("level"))
                 {
-                    options.MinLevel = minLevel;
+                    var minLevel = options.MinLevel;
+                    if (Enum.TryParse<LogLevel>(context.Request.Query["level"], out minLevel))
+                    {
+                        options.MinLevel = minLevel;
+                    }
+                }
+                if (context.Request.Query.ContainsKey("name"))
+                {
+                    var namePrefix = context.Request.Query.GetValues("name")[0];
+                    options.NamePrefix = namePrefix;
                 }
             }
-            if (context.Request.Query.ContainsKey("name"))
+            return Tuple.Create(options, isRedirect);
-            {
-                var namePrefix = context.Request.Query.GetValues("name")[0];
-                options.NamePrefix = namePrefix;
-            }
-            return options;
         }
     }
 }

src/Microsoft.AspNet.Diagnostics.Elm/ElmStore.cs

@@ -48,6 +48,14 @@ namespace Microsoft.AspNet.Diagnostics.Elm
             }
         }
 
+        /// <summary>
+        /// Removes all activity contexts that have been stored.
+        /// </summary>
+        public void Clear()
+        {
+            Activities.Clear();
+        }
+
         /// <summary>
         /// Returns the total number of logs in all activities in the store
         /// </summary>

src/Microsoft.AspNet.Diagnostics.Elm/Views/LogPage.cs

@@ -318,6 +318,10 @@ col:nth-child(2) {
     background-color: #FAFAFA;
 }
 
+form { 
+    display: inline-block; 
+}
+
 h1 {
     margin-left: 25px;
 }
@@ -501,6 +505,9 @@ tr:nth-child(2n) {
             WriteLiteral(@" />
         <input type=""submit"" value=""filter"" />
     </form>
+    <form id=""clear"" method=""post"" action="""">
+        <button type=""submit"" name=""clear"" value=""1"">Clear Logs</button>
+    </form>
 
     <table id=""requestTable"">
         <thead id=""requestHeader"">
@@ -518,13 +525,13 @@ tr:nth-child(2n) {
             <col />
         </colgroup>
 ");
-#line 136 "LogPage.cshtml"
+#line 139 "LogPage.cshtml"
         
 
 #line default
 #line hidden
 
-#line 136 "LogPage.cshtml"
+#line 139 "LogPage.cshtml"
          foreach (var activity in Model.Activities.Reverse())
         {
 
@@ -532,13 +539,13 @@ tr:nth-child(2n) {
 #line hidden
 
             WriteLiteral("            <tbody>\r\n                <tr class=\"requestRow\">\r\n");
-#line 140 "LogPage.cshtml"
+#line 143 "LogPage.cshtml"
                     
 
 #line default
 #line hidden
 
-#line 140 "LogPage.cshtml"
+#line 143 "LogPage.cshtml"
                       
                         if (activity.HttpInfo != null)
                         {
@@ -548,30 +555,30 @@ tr:nth-child(2n) {
 #line hidden
 
             WriteLiteral("                            <td><a");
-            WriteAttribute("href", Tuple.Create(" href=\"", 4400), Tuple.Create("\"", 4419), 
+            WriteAttribute("href", Tuple.Create(" href=\"", 4534), Tuple.Create("\"", 4553), 
-            Tuple.Create(Tuple.Create("", 4407), Tuple.Create<System.Object, System.Int32>(requestPath, 4407), false));
+            Tuple.Create(Tuple.Create("", 4541), Tuple.Create<System.Object, System.Int32>(requestPath, 4541), false));
-            WriteAttribute("title", Tuple.Create(" title=\"", 4420), Tuple.Create("\"", 4451), 
+            WriteAttribute("title", Tuple.Create(" title=\"", 4554), Tuple.Create("\"", 4585), 
-            Tuple.Create(Tuple.Create("", 4428), Tuple.Create<System.Object, System.Int32>(activity.HttpInfo.Path, 4428), false));
+            Tuple.Create(Tuple.Create("", 4562), Tuple.Create<System.Object, System.Int32>(activity.HttpInfo.Path, 4562), false));
             WriteLiteral(">");
-#line 144 "LogPage.cshtml"
+#line 147 "LogPage.cshtml"
                                                                                   Write(activity.HttpInfo.Path);
 
 #line default
 #line hidden
             WriteLiteral("</a></td>\r\n                            <td>");
-#line 145 "LogPage.cshtml"
+#line 148 "LogPage.cshtml"
                            Write(activity.HttpInfo.Host);
 
 #line default
 #line hidden
             WriteLiteral("</td>\r\n                            <td>");
-#line 146 "LogPage.cshtml"
+#line 149 "LogPage.cshtml"
                            Write(activity.HttpInfo.StatusCode);
 
 #line default
 #line hidden
             WriteLiteral("</td>\r\n");
-#line 147 "LogPage.cshtml"
+#line 150 "LogPage.cshtml"
                         }
                         else
                         {
@@ -580,13 +587,13 @@ tr:nth-child(2n) {
 #line hidden
 
             WriteLiteral("                            <td colspan=\"3\">");
-#line 150 "LogPage.cshtml"
+#line 153 "LogPage.cshtml"
                                        Write(activity.Root.State);
 
 #line default
 #line hidden
             WriteLiteral("</td>\r\n");
-#line 151 "LogPage.cshtml"
+#line 154 "LogPage.cshtml"
                         }
                     
 
@@ -608,13 +615,13 @@ tr:nth-child(2n) {
                             </thead>
                             <tbody>
 ");
-#line 166 "LogPage.cshtml"
+#line 169 "LogPage.cshtml"
                                 
 
 #line default
 #line hidden
 
-#line 166 "LogPage.cshtml"
+#line 169 "LogPage.cshtml"
                                  if (activity.Id.Equals(Guid.Empty))
                                 {
                                     // message not within a scope
@@ -623,12 +630,12 @@ tr:nth-child(2n) {
 #line default
 #line hidden
 
-#line 169 "LogPage.cshtml"
+#line 172 "LogPage.cshtml"
                                Write(LogRow(activity.Root.Messages.FirstOrDefault(), 0));
 
 #line default
 #line hidden
-#line 169 "LogPage.cshtml"
+#line 172 "LogPage.cshtml"
                                                                                        
                                 }
                                 else
@@ -638,12 +645,12 @@ tr:nth-child(2n) {
 #line default
 #line hidden
 
-#line 173 "LogPage.cshtml"
+#line 176 "LogPage.cshtml"
                                Write(Traverse(activity.Root, 0));
 
 #line default
 #line hidden
-#line 173 "LogPage.cshtml"
+#line 176 "LogPage.cshtml"
                                                                
                                 }
 
@@ -652,7 +659,7 @@ tr:nth-child(2n) {
 
             WriteLiteral("                            </tbody>\r\n                        </table>\r\n         " +
 "           </td>\r\n                </tr>\r\n            </tbody>\r\n");
-#line 180 "LogPage.cshtml"
+#line 183 "LogPage.cshtml"
         }
 
 #line default

src/Microsoft.AspNet.Diagnostics.Elm/Views/LogPage.cshtml

@@ -117,6 +117,9 @@
         <input type="text" name="name" value="@Model.Options.NamePrefix" />
         <input type="submit" value="filter" />
     </form>
+    <form id="clear" method="post" action="">
+        <button type="submit" name="clear" value="1">Clear Logs</button>
+    </form>
 
     <table id="requestTable">
         <thead id="requestHeader">

src/Microsoft.AspNet.Diagnostics.Elm/Views/LogPage.css

@@ -8,6 +8,10 @@ col:nth-child(2) {
     background-color: #FAFAFA;
 }
 
+form { 
+    display: inline-block; 
+}
+
 h1 {
     margin-left: 25px;
 }