start watcher after all creds have been loaded (#9301)

start watcher after all creds have been loaded
to avoid any conflicting locks that might get
deadlocked.

Deprecate unused peer calls for LoadUsers()

buildscripts/race.sh

@@ -3,5 +3,5 @@
 set -e
 
 for d in $(go list ./... | grep -v browser); do
-    CGO_ENABLED=1 go test -v -race --timeout 20m "$d"
+    CGO_ENABLED=1 go test -v -race --timeout 50m "$d"
 done

cmd/iam-etcd-store.go

@@ -559,42 +559,39 @@ func (ies *IAMEtcdStore) deleteGroupInfo(name string) error {
 }
 
 func (ies *IAMEtcdStore) watch(ctx context.Context, sys *IAMSys) {
-	watchEtcd := func() {
+	for {
+	outerLoop:
+		// Refresh IAMSys with etcd watch.
+		watchCh := ies.client.Watch(ctx,
+			iamConfigPrefix, etcd.WithPrefix(), etcd.WithKeysOnly())
+
 		for {
-		outerLoop:
-			// Refresh IAMSys with etcd watch.
-			watchCh := ies.client.Watch(ctx,
-				iamConfigPrefix, etcd.WithPrefix(), etcd.WithKeysOnly())
-
-			for {
-				select {
-				case <-ctx.Done():
-					return
-				case watchResp, ok := <-watchCh:
-					if !ok {
-						time.Sleep(1 * time.Second)
-						// Upon an error on watch channel
-						// re-init the watch channel.
-						goto outerLoop
-					}
-					if err := watchResp.Err(); err != nil {
-						logger.LogIf(ctx, err)
-						// log and retry.
-						time.Sleep(1 * time.Second)
-						// Upon an error on watch channel
-						// re-init the watch channel.
-						goto outerLoop
-					}
-					for _, event := range watchResp.Events {
-						ies.lock()
-						ies.reloadFromEvent(sys, event)
-						ies.unlock()
-					}
+			select {
+			case <-ctx.Done():
+				return
+			case watchResp, ok := <-watchCh:
+				if !ok {
+					time.Sleep(1 * time.Second)
+					// Upon an error on watch channel
+					// re-init the watch channel.
+					goto outerLoop
+				}
+				if err := watchResp.Err(); err != nil {
+					logger.LogIf(ctx, err)
+					// log and retry.
+					time.Sleep(1 * time.Second)
+					// Upon an error on watch channel
+					// re-init the watch channel.
+					goto outerLoop
+				}
+				for _, event := range watchResp.Events {
+					ies.lock()
+					ies.reloadFromEvent(sys, event)
+					ies.unlock()
 				}
 			}
 		}
 	}
-	go watchEtcd()
 }
 
 // sys.RLock is held by caller.

cmd/iam-object-store.go

@@ -590,17 +590,13 @@ func listIAMConfigItems(ctx context.Context, objAPI ObjectLayer, pathPrefix stri
 }
 
 func (iamOS *IAMObjectStore) watch(ctx context.Context, sys *IAMSys) {
-	watchDisk := func() {
-		for {
-			select {
-			case <-ctx.Done():
-				return
-			case <-time.NewTimer(globalRefreshIAMInterval).C:
-				logger.LogIf(ctx, iamOS.loadAll(ctx, sys))
-			}
+	// Refresh IAMSys.
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-time.NewTimer(globalRefreshIAMInterval).C:
+			logger.LogIf(ctx, iamOS.loadAll(ctx, sys))
 		}
 	}
-
-	// Refresh IAMSys in background.
-	go watchDisk()
 }

cmd/iam.go

@@ -353,13 +353,6 @@ func (sys *IAMSys) LoadUser(objAPI ObjectLayer, accessKey string, userType IAMUs
 	return nil
 }
 
-// Load - loads iam subsystem
-func (sys *IAMSys) Load(ctx context.Context) error {
-	// Pass nil objectlayer here - it will be loaded internally
-	// from the IAMStorageAPI.
-	return sys.store.loadAll(ctx, sys)
-}
-
 // Perform IAM configuration migration.
 func (sys *IAMSys) doIAMConfigMigration(ctx context.Context) error {
 	return sys.store.migrateBackendFormat(ctx)
@@ -386,12 +379,12 @@ func (sys *IAMSys) Init(ctx context.Context, objAPI ObjectLayer) error {
 		return err
 	}
 
-	sys.store.watch(ctx, sys)
 	err := sys.store.loadAll(ctx, sys)
 
 	// Invalidate the old cred after finishing IAM initialization
 	globalOldCred = auth.Credentials{}
 
+	go sys.store.watch(ctx, sys)
 	return err
 }
 

cmd/notification.go

@@ -225,19 +225,6 @@ func (sys *NotificationSys) LoadUser(accessKey string, temp bool) []Notification
 	return ng.Wait()
 }
 
-// LoadUsers - calls LoadUsers RPC call on all peers.
-func (sys *NotificationSys) LoadUsers() []NotificationPeerErr {
-	ng := WithNPeers(len(sys.peerClients))
-	for idx, client := range sys.peerClients {
-		if client == nil {
-			continue
-		}
-		client := client
-		ng.Go(context.Background(), client.LoadUsers, idx, *client.host)
-	}
-	return ng.Wait()
-}
-
 // LoadGroup - loads a specific group on all peers.
 func (sys *NotificationSys) LoadGroup(group string) []NotificationPeerErr {
 	ng := WithNPeers(len(sys.peerClients))

cmd/peer-rest-client.go

@@ -874,16 +874,6 @@ func (client *peerRESTClient) LoadUser(accessKey string, temp bool) (err error)
 	return nil
 }
 
-// LoadUsers - send load users command to peer nodes.
-func (client *peerRESTClient) LoadUsers() (err error) {
-	respBody, err := client.call(peerRESTMethodLoadUsers, nil, nil, -1)
-	if err != nil {
-		return
-	}
-	defer http.DrainBody(respBody)
-	return nil
-}
-
 // LoadGroup - send load group command to peers.
 func (client *peerRESTClient) LoadGroup(group string) error {
 	values := make(url.Values)

cmd/peer-rest-server.go

@@ -339,33 +339,6 @@ func (s *peerRESTServer) LoadUserHandler(w http.ResponseWriter, r *http.Request)
 	w.(http.Flusher).Flush()
 }
 
-// LoadUsersHandler - reloads all users and canned policies.
-func (s *peerRESTServer) LoadUsersHandler(w http.ResponseWriter, r *http.Request) {
-	if !s.IsValid(w, r) {
-		s.writeErrorResponse(w, errors.New("Invalid request"))
-		return
-	}
-
-	objAPI := newObjectLayerWithoutSafeModeFn()
-	if objAPI == nil {
-		s.writeErrorResponse(w, errServerNotInitialized)
-		return
-	}
-
-	if globalIAMSys == nil {
-		s.writeErrorResponse(w, errServerNotInitialized)
-		return
-	}
-
-	err := globalIAMSys.Load(GlobalContext)
-	if err != nil {
-		s.writeErrorResponse(w, err)
-		return
-	}
-
-	w.(http.Flusher).Flush()
-}
-
 // LoadGroupHandler - reloads group along with members list.
 func (s *peerRESTServer) LoadGroupHandler(w http.ResponseWriter, r *http.Request) {
 	if !s.IsValid(w, r) {
@@ -1359,7 +1332,6 @@ func registerPeerRESTHandlers(router *mux.Router) {
 	subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodLoadPolicyMapping).HandlerFunc(httpTraceAll(server.LoadPolicyMappingHandler)).Queries(restQueries(peerRESTUserOrGroup)...)
 	subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodDeleteUser).HandlerFunc(httpTraceAll(server.LoadUserHandler)).Queries(restQueries(peerRESTUser)...)
 	subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodLoadUser).HandlerFunc(httpTraceAll(server.LoadUserHandler)).Queries(restQueries(peerRESTUser, peerRESTUserTemp)...)
-	subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodLoadUsers).HandlerFunc(httpTraceAll(server.LoadUsersHandler))
 	subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodLoadGroup).HandlerFunc(httpTraceAll(server.LoadGroupHandler)).Queries(restQueries(peerRESTGroup)...)
 
 	subrouter.Methods(http.MethodPost).Path(peerRESTVersionPrefix + peerRESTMethodStartProfiling).HandlerFunc(httpTraceAll(server.StartProfilingHandler)).Queries(restQueries(peerRESTProfiler)...)