dashboard: cache per-subsystem stats

For each subsystem, collect the number of open, fixed and invalid bugs.

3 files changed, 36 insertions, 20 deletions

diff --git a/dashboard/app/cache.go b/dashboard/app/cache.go
index 2b4178abc..177d4750f 100644
--- a/dashboard/app/cache.go
+++ b/dashboard/app/cache.go
@@ -15,6 +15,11 @@ import (
 )
 
 type Cached struct {
+	Total      CachedBugStats
+	Subsystems map[string]CachedBugStats
+}
+
+type CachedBugStats struct {
 	Open    int
 	Fixed   int
 	Invalid int
@@ -58,22 +63,18 @@ func cacheUpdate(w http.ResponseWriter, r *http.Request) {
 }
 
 func buildAndStoreCached(c context.Context, bugs []*Bug, ns string, accessLevel AccessLevel) (*Cached, error) {
-	v := &Cached{}
+	v := &Cached{
+		Subsystems: make(map[string]CachedBugStats),
+	}
 	for _, bug := range bugs {
-		switch bug.Status {
-		case BugStatusOpen:
-			if accessLevel < bug.sanitizeAccess(accessLevel) {
-				continue
-			}
-			if len(bug.Commits) == 0 {
-				v.Open++
-			} else {
-				v.Fixed++
-			}
-		case BugStatusFixed:
-			v.Fixed++
-		case BugStatusInvalid:
-			v.Invalid++
+		if bug.Status == BugStatusOpen && accessLevel < bug.sanitizeAccess(accessLevel) {
+			continue
+		}
+		v.Total.Record(bug)
+		for _, subsystem := range bug.Tags.Subsystems {
+			stats := v.Subsystems[subsystem.Name]
+			stats.Record(bug)
+			v.Subsystems[subsystem.Name] = stats
 		}
 	}
 	item := &memcache.Item{
@@ -87,6 +88,21 @@ func buildAndStoreCached(c context.Context, bugs []*Bug, ns string, accessLevel
 	return v, nil
 }
 
+func (c *CachedBugStats) Record(bug *Bug) {
+	switch bug.Status {
+	case BugStatusOpen:
+		if len(bug.Commits) == 0 {
+			c.Open++
+		} else {
+			c.Fixed++
+		}
+	case BugStatusFixed:
+		c.Fixed++
+	case BugStatusInvalid:
+		c.Invalid++
+	}
+}
+
 func cacheKey(ns string, accessLevel AccessLevel) string {
 	return fmt.Sprintf("%v-%v", ns, accessLevel)
 }
diff --git a/dashboard/app/handler.go b/dashboard/app/handler.go
index 7c6e9a23e..cb998a516 100644
--- a/dashboard/app/handler.go
+++ b/dashboard/app/handler.go
@@ -127,7 +127,7 @@ type uiHeader struct {
 	AnalyticsTrackingID string
 	Subpage             string
 	Namespace           string
-	Cached              *Cached
+	BugCounts           *CachedBugStats
 	Namespaces          []uiNamespace
 }
 
@@ -209,7 +209,7 @@ func commonHeader(c context.Context, r *http.Request, w http.ResponseWriter, ns
 		if err != nil {
 			return nil, err
 		}
-		h.Cached = cached
+		h.BugCounts = &cached.Total
 	}
 	return h, nil
 }
diff --git a/dashboard/app/templates.html b/dashboard/app/templates.html
index 0420aef25..2b7ef61c1 100644
--- a/dashboard/app/templates.html
+++ b/dashboard/app/templates.html
@@ -58,11 +58,11 @@ Use of this source code is governed by Apache 2 LICENSE that can be found in the
 			<tr>
 				<td class="navigation">
 					<a class="navigation_tab{{if eq .URLPath (printf "/%v" $.Namespace)}}_selected{{end}}" href='/{{$.Namespace}}'>
-						<span style="color:DeepPink;">🐞</span> Open [{{$.Cached.Open}}]</a>
+						<span style="color:DeepPink;">🐞</span> Open [{{$.BugCounts.Open}}]</a>
 					<a class="navigation_tab{{if eq .URLPath (printf "/%v/fixed" $.Namespace)}}_selected{{end}}" href='/{{$.Namespace}}/fixed'>
-						<span style="color:ForestGreen;">🐞</span> Fixed [{{$.Cached.Fixed}}]</a>
+						<span style="color:ForestGreen;">🐞</span> Fixed [{{$.BugCounts.Fixed}}]</a>
 					<a class="navigation_tab{{if eq .URLPath (printf "/%v/invalid" $.Namespace)}}_selected{{end}}" href='/{{$.Namespace}}/invalid'>
-						<span style="color:RoyalBlue;">🐞</span> Invalid [{{$.Cached.Invalid}}]</a>
+						<span style="color:RoyalBlue;">🐞</span> Invalid [{{$.BugCounts.Invalid}}]</a>
 					<a class="navigation_tab{{if eq .URLPath (printf "/%v/graph/bugs" $.Namespace)}}_selected{{end}}" href='/{{$.Namespace}}/graph/bugs'>
 						<span style="color:DarkOrange;">📈</span> Kernel Health</a>
 					<a class="navigation_tab{{if eq .URLPath (printf "/%v/graph/lifetimes" $.Namespace)}}_selected{{end}}" href='/{{$.Namespace}}/graph/lifetimes'>