[#2165] services/tree: Allow to set custom synchronization interval

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

cmd/frostfs-node/config/tree/config.go

@@ -63,3 +63,11 @@ func (c TreeConfig) ReplicationChannelCapacity() int {
 func (c TreeConfig) ReplicationWorkerCount() int {
 	return int(config.IntSafe(c.cfg, "replication_worker_count"))
 }
+
+// SyncInterval returns the value of "sync_interval"
+// config parameter from the "tree" section.
+//
+// Returns 0 if config value is not specified.
+func (c TreeConfig) SyncInterval() time.Duration {
+	return config.DurationSafe(c.cfg, "sync_interval")
+}

cmd/frostfs-node/config/tree/config_test.go

@@ -33,6 +33,7 @@ func TestTreeSection(t *testing.T) {
 		require.Equal(t, 32, treeSec.ReplicationChannelCapacity())
 		require.Equal(t, 32, treeSec.ReplicationWorkerCount())
 		require.Equal(t, 5*time.Second, treeSec.ReplicationTimeout())
+		require.Equal(t, time.Hour, treeSec.SyncInterval())
 	}
 
 	configtest.ForEachFileType(path, fileConfigTest)

cmd/frostfs-node/tree.go

@@ -3,6 +3,7 @@ package main
 import (
 	"context"
 	"errors"
+	"time"
 
 	treeconfig "github.com/TrueCloudLab/frostfs-node/cmd/frostfs-node/config/tree"
 	"github.com/TrueCloudLab/frostfs-node/pkg/core/container"
@@ -63,12 +64,29 @@ func initTreeService(c *cfg) {
 		c.treeService.Start(ctx)
 	}))
 
-	addNewEpochNotificationHandler(c, func(_ event.Event) {
-		err := c.treeService.SynchronizeAll()
-		if err != nil {
-			c.log.Error("could not synchronize Tree Service", zap.Error(err))
-		}
-	})
+	if d := treeConfig.SyncInterval(); d == 0 {
+		addNewEpochNotificationHandler(c, func(_ event.Event) {
+			err := c.treeService.SynchronizeAll()
+			if err != nil {
+				c.log.Error("could not synchronize Tree Service", zap.Error(err))
+			}
+		})
+	} else {
+		go func() {
+			tick := time.NewTicker(d)
+			defer tick.Stop()
+
+			for range tick.C {
+				err := c.treeService.SynchronizeAll()
+				if err != nil {
+					c.log.Error("could not synchronize Tree Service", zap.Error(err))
+					if errors.Is(err, tree.ErrShuttingDown) {
+						return
+					}
+				}
+			}
+		}()
+	}
 
 	subscribeToContainerRemoval(c, func(e event.Event) {
 		ev := e.(containerEvent.DeleteSuccess)