dashboard: filter by no subsystems

Count the number of bugs without any subsystem and let users filter bugs
by this criteria.

5 files changed, 37 insertions, 4 deletions

diff --git a/dashboard/app/cache.go b/dashboard/app/cache.go
index 177d4750f..2c8ca6376 100644
--- a/dashboard/app/cache.go
+++ b/dashboard/app/cache.go
@@ -15,8 +15,9 @@ import (
 )
 
 type Cached struct {
-	Total      CachedBugStats
-	Subsystems map[string]CachedBugStats
+	Total       CachedBugStats
+	Subsystems  map[string]CachedBugStats
+	NoSubsystem CachedBugStats
 }
 
 type CachedBugStats struct {
@@ -76,6 +77,9 @@ func buildAndStoreCached(c context.Context, bugs []*Bug, ns string, accessLevel
 			stats.Record(bug)
 			v.Subsystems[subsystem.Name] = stats
 		}
+		if len(bug.Tags.Subsystems) == 0 {
+			v.NoSubsystem.Record(bug)
+		}
 	}
 	item := &memcache.Item{
 		Key:        cacheKey(ns, accessLevel),
diff --git a/dashboard/app/main.go b/dashboard/app/main.go
index 55574c4c0..ad503c0ef 100644
--- a/dashboard/app/main.go
+++ b/dashboard/app/main.go
@@ -351,11 +351,13 @@ type userBugFilter struct {
 	Manager     string // show bugs that happened on the manager
 	OnlyManager string // show bugs that happened ONLY on the manager
 	Subsystem   string // only show bugs belonging to the subsystem
+	NoSubsystem bool
 }
 
 func MakeBugFilter(r *http.Request) *userBugFilter {
 	return &userBugFilter{
 		Subsystem:   r.FormValue("subsystem"),
+		NoSubsystem: r.FormValue("no_subsystem") != "",
 		Manager:     r.FormValue("manager"),
 		OnlyManager: r.FormValue("only_manager"),
 	}
@@ -386,6 +388,9 @@ func (filter *userBugFilter) MatchBug(bug *Bug) bool {
 	if filter.Manager != "" && !stringInList(bug.HappenedOn, filter.Manager) {
 		return false
 	}
+	if filter.NoSubsystem && len(bug.Tags.Subsystems) > 0 {
+		return false
+	}
 	if filter.Subsystem != "" && !bug.hasSubsystem(filter.Subsystem) {
 		return false
 	}
@@ -396,7 +401,7 @@ func (filter *userBugFilter) Any() bool {
 	if filter == nil {
 		return false
 	}
-	return filter.Subsystem != "" || filter.OnlyManager != "" || filter.Manager != ""
+	return filter.Subsystem != "" || filter.OnlyManager != "" || filter.Manager != "" || filter.NoSubsystem
 }
 
 // handleMain serves main page.
@@ -862,6 +867,17 @@ func handleSubsystemsList(c context.Context, w http.ResponseWriter, r *http.Requ
 		}
 		list = append(list, record)
 	}
+	list = append(list, &uiSubsystem{
+		Name: "",
+		Open: uiSubsystemStats{
+			Count: cached.NoSubsystem.Open,
+			Link:  html.AmendURL("/"+hdr.Namespace, "no_subsystem", "true"),
+		},
+		Fixed: uiSubsystemStats{
+			Count: cached.NoSubsystem.Open,
+			Link:  html.AmendURL("/"+hdr.Namespace+"/fixed", "no_subsystem", "true"),
+		},
+	})
 	sort.Slice(list, func(i, j int) bool { return list[i].Name < list[j].Name })
 	return serveTemplate(w, "subsystems.html", &uiSubsystemsPage{
 		Header:   hdr,
diff --git a/dashboard/app/main_test.go b/dashboard/app/main_test.go
index fe9410da3..3a07f5040 100644
--- a/dashboard/app/main_test.go
+++ b/dashboard/app/main_test.go
@@ -169,6 +169,7 @@ func TestMainBugFilters(t *testing.T) {
 	client.UploadBuild(build1)
 
 	crash1 := testCrash(build1, 1)
+	crash1.Title = "my-crash-title"
 	client.ReportCrash(crash1)
 	client.pollBugs(1)
 
@@ -182,6 +183,11 @@ func TestMainBugFilters(t *testing.T) {
 	c.expectOK(err)
 	assert.NotContains(t, string(reply), build1.Manager) // managers are hidden
 	assert.Contains(t, string(reply), "Applied filters") // we're seeing a prompt to disable the filter
+	assert.NotContains(t, string(reply), crash1.Title)   // the bug does not belong to the subsystem
+
+	reply, err = c.AuthGET(AccessAdmin, "/test1?no_subsystem=true")
+	c.expectOK(err)
+	assert.Contains(t, string(reply), crash1.Title) // the bug has no subsystems
 }
 
 func TestSubsystemsList(t *testing.T) {
diff --git a/dashboard/app/subsystems.html b/dashboard/app/subsystems.html
index b6f9bbd71..2b1fe0f57 100644
--- a/dashboard/app/subsystems.html
+++ b/dashboard/app/subsystems.html
@@ -28,7 +28,11 @@ The list of polled trees.
 		</tr>
 		{{range $item := .List}}
 		<tr>
-			<td>{{link $item.Open.Link $item.Name}}</td>
+			{{if $item.Name}}
+				<td>{{link $item.Open.Link $item.Name}}</td>
+			{{else}}
+				<td><b>{{link $item.Open.Link "no subsystem"}}</b></td>
+			{{end}}
 			<td>{{$item.Lists}}</td>
 			<td>{{link $item.Open.Link (printf "%d" $item.Open.Count)}}</td>
 			<td>{{link $item.Fixed.Link (printf "%d" $item.Fixed.Count)}}</td>
diff --git a/dashboard/app/templates.html b/dashboard/app/templates.html
index 0a2c9301a..52b8e4ea6 100644
--- a/dashboard/app/templates.html
+++ b/dashboard/app/templates.html
@@ -102,6 +102,9 @@ Use of this source code is governed by Apache 2 LICENSE that can be found in the
 	{{if .Filter.Subsystem}}
 		Subsystem={{.Filter.Subsystem}} ({{link (call .DropURL "subsystem") "drop"}})
 	{{end}}
+	{{if .Filter.NoSubsystem}}
+		NoSubsystem={{.Filter.NoSubsystem}} ({{link (call .DropURL "no_subsystem") "drop"}})
+	{{end}}
 	<br>
 {{end}}
 {{end}}