* filtering/set_url: allow changing Name and URL parameters

home/filter.go

@@ -68,45 +68,80 @@ func userFilter() filter {
 	return f
 }
 
-// Enable or disable a filter
-func filterEnable(url string, enable bool) bool {
-	r := false
+const (
+	statusFound          = 1
+	statusEnabledChanged = 2
+	statusURLChanged     = 4
+	statusURLExists      = 8
+)
+
+// Update properties for a filter specified by its URL
+// Return status* flags.
+func filterSetProperties(url string, newf filter) int {
+	r := 0
 	config.Lock()
+	defer config.Unlock()
+
 	for i := range config.Filters {
-		filter := &config.Filters[i] // otherwise we will be operating on a copy
-		if filter.URL == url {
-			filter.Enabled = enable
-			if enable {
-				e := filter.load()
-				if e != nil {
-					// This isn't a fatal error,
-					//  because it may occur when someone removes the file from disk.
-					// In this case the periodic update task will try to download the file.
-					filter.LastUpdated = time.Time{}
-					log.Tracef("%s filter load: %v", url, e)
+		f := &config.Filters[i]
+		if f.URL != url {
+			continue
+		}
+
+		log.Debug("filter: set properties: %s: {%s %s %v}",
+			f.URL, newf.Name, newf.URL, newf.Enabled)
+		f.Name = newf.Name
+
+		if f.URL != newf.URL {
+			r |= statusURLChanged
+			if filterExistsNoLock(newf.URL) {
+				return statusURLExists
+			}
+			f.URL = newf.URL
+			f.unload()
+			f.LastUpdated = time.Time{}
+		}
+
+		if f.Enabled != newf.Enabled {
+			r |= statusEnabledChanged
+			f.Enabled = newf.Enabled
+			if f.Enabled {
+				if (r & statusURLChanged) == 0 {
+					e := f.load()
+					if e != nil {
+						// This isn't a fatal error,
+						//  because it may occur when someone removes the file from disk.
+						// In this case the periodic update task will try to download the file.
+						f.LastUpdated = time.Time{}
+					}
 				}
 			} else {
-				filter.unload()
+				f.unload()
 			}
-			r = true
-			break
 		}
+
+		return r | statusFound
 	}
-	config.Unlock()
-	return r
+	return 0
 }
 
 // Return TRUE if a filter with this URL exists
 func filterExists(url string) bool {
-	r := false
 	config.RLock()
+	r := filterExistsNoLock(url)
+	config.RUnlock()
+	return r
+}
+
+// Return TRUE if a filter with this URL exists
+func filterExistsNoLock(url string) bool {
+	r := false
 	for i := range config.Filters {
 		if config.Filters[i].URL == url {
 			r = true
 			break
 		}
 	}
-	config.RUnlock()
 	return r
 }