Add a REST endpoint to list databases in all clusters

pkg/apiserver/apiserver.go

@@ -37,6 +37,7 @@ type controllerInformer interface {
 	ListQueue(workerID uint32) (*spec.QueueDump, error)
 	GetWorkersCnt() uint32
 	WorkerStatus(workerID uint32) (*spec.WorkerStatus, error)
+	GetClusterDatabasesMap() map[string][]string
 }
 
 // Server describes HTTP API server
@@ -78,6 +79,7 @@ func New(controller controllerInformer, port int, logger *logrus.Logger) *Server
 
 	mux.HandleFunc("/clusters/", s.clusters)
 	mux.HandleFunc("/workers/", s.workers)
+	mux.HandleFunc("/databases/", s.databases)
 
 	s.http = http.Server{
 		Addr:        fmt.Sprintf(":%d", port),
@@ -222,6 +224,14 @@ func (s *Server) workers(w http.ResponseWriter, req *http.Request) {
 	s.respond(resp, err, w)
 }
 
+func (s *Server) databases(w http.ResponseWriter, req *http.Request) {
+
+	databaseNamesPerCluster := s.controller.GetClusterDatabasesMap()
+	s.respond(databaseNamesPerCluster, nil, w)
+	return
+
+}
+
 func (s *Server) allQueues(w http.ResponseWriter, r *http.Request) {
 	workersCnt := s.controller.GetWorkersCnt()
 	resp := make(map[uint32]*spec.QueueDump, workersCnt)