Introduce central nats client

cmd/cc-backend/main.go

@@ -30,6 +30,7 @@ import (
 	"github.com/ClusterCockpit/cc-backend/internal/tagger"
 	"github.com/ClusterCockpit/cc-backend/internal/taskmanager"
 	"github.com/ClusterCockpit/cc-backend/pkg/archive"
+	"github.com/ClusterCockpit/cc-backend/pkg/nats"
 	"github.com/ClusterCockpit/cc-backend/web"
 	ccconf "github.com/ClusterCockpit/cc-lib/ccConfig"
 	cclog "github.com/ClusterCockpit/cc-lib/ccLogger"
@@ -267,6 +268,13 @@ func generateJWT(authHandle *auth.Authentication, username string) error {
 }
 
 func initSubsystems() error {
+	// Initialize nats client
+	natsConfig := ccconf.GetPackageConfig("nats")
+	if err := nats.Init(natsConfig); err != nil {
+		return fmt.Errorf("initializing nats client: %w", err)
+	}
+	nats.Connect()
+
 	// Initialize job archive
 	archiveCfg := ccconf.GetPackageConfig("archive")
 	if archiveCfg == nil {

cmd/cc-backend/server.go

@@ -31,6 +31,7 @@ import (
 	"github.com/ClusterCockpit/cc-backend/internal/graph/generated"
 	"github.com/ClusterCockpit/cc-backend/internal/memorystore"
 	"github.com/ClusterCockpit/cc-backend/internal/routerConfig"
+	"github.com/ClusterCockpit/cc-backend/pkg/nats"
 	"github.com/ClusterCockpit/cc-backend/web"
 	cclog "github.com/ClusterCockpit/cc-lib/ccLogger"
 	"github.com/ClusterCockpit/cc-lib/runtimeEnv"
@@ -363,6 +364,11 @@ func (s *Server) Shutdown(ctx context.Context) {
 	shutdownCtx, cancel := context.WithTimeout(ctx, 30*time.Second)
 	defer cancel()
 
+	nc := nats.GetClient()
+	if nc != nil {
+		nc.Close()
+	}
+
 	// First shut down the server gracefully (waiting for all ongoing requests)
 	if err := s.server.Shutdown(shutdownCtx); err != nil {
 		cclog.Errorf("Server shutdown error: %v", err)