Live: broadcast events when dashboard is saved (#27583)

Co-authored-by: kay delaney <45561153+kaydelaney@users.noreply.github.com>
Co-authored-by: Torkel Ödegaard <torkel@grafana.org>

pkg/models/live.go

@@ -0,0 +1,30 @@
+package models
+
+import "github.com/centrifugal/centrifuge"
+
+// ChannelPublisher writes data into a channel
+type ChannelPublisher func(channel string, data []byte) error
+
+// ChannelHandler defines the core channel behavior
+type ChannelHandler interface {
+	// This is called fast and often -- it must be synchrnozed
+	GetChannelOptions(id string) centrifuge.ChannelOptions
+
+	// Called when a client wants to subscribe to a channel
+	OnSubscribe(c *centrifuge.Client, e centrifuge.SubscribeEvent) error
+
+	// Called when something writes into the channel.  The returned value will be broadcast if len() > 0
+	OnPublish(c *centrifuge.Client, e centrifuge.PublishEvent) ([]byte, error)
+}
+
+// ChannelHandlerProvider -- this should be implemented by any core feature
+type ChannelHandlerProvider interface {
+	// This is called fast and often -- it must be synchrnozed
+	GetHandlerForPath(path string) (ChannelHandler, error)
+}
+
+// DashboardActivityChannel is a service to advertise dashboard activity
+type DashboardActivityChannel interface {
+	DashboardSaved(uid string, userID int64) error
+	DashboardDeleted(uid string, userID int64) error
+}