server: Refactor compaction checker

Signed-off-by: Marek Siarkowicz <siarkowicz@google.com>

server/etcdserver/server.go

@@ -295,7 +295,8 @@ type EtcdServer struct {
 	*AccessController
 	// forceSnapshot can force snapshot be triggered after apply, independent of the snapshotCount.
 	// Should only be set within apply code path. Used to force snapshot after cluster version downgrade.
-	forceSnapshot bool
+	forceSnapshot     bool
+	corruptionChecker CorruptionChecker
 }
 
 // NewServer creates a new EtcdServer from the supplied configuration. The
@@ -371,6 +372,7 @@ func NewServer(cfg config.ServerConfig) (srv *EtcdServer, err error) {
 		CompactionSleepInterval: cfg.CompactionSleepInterval,
 	}
 	srv.kv = mvcc.New(srv.Logger(), srv.be, srv.lessor, mvccStoreConfig)
+	srv.corruptionChecker = NewCorruptionChecker(cfg.Logger, srv)
 
 	srv.authStore = auth.NewAuthStore(srv.Logger(), schema.NewAuthBackend(srv.Logger(), srv.be), tp, int(cfg.BcryptCost))
 
@@ -2199,7 +2201,6 @@ func (s *EtcdServer) monitorKVHash() {
 		zap.String("local-member-id", s.MemberId().String()),
 		zap.Duration("interval", t),
 	)
-	monitor := NewCorruptionMonitor(lg, s)
 	for {
 		select {
 		case <-s.stopping:
@@ -2209,7 +2210,7 @@ func (s *EtcdServer) monitorKVHash() {
 		if !s.isLeader() {
 			continue
 		}
-		if err := monitor.periodicCheck(); err != nil {
+		if err := s.corruptionChecker.PeriodicCheck(); err != nil {
 			lg.Warn("failed to check hash KV", zap.Error(err))
 		}
 	}
@@ -2416,3 +2417,7 @@ func (s *EtcdServer) getTxPostLockInsideApplyHook() func() {
 		}
 	}
 }
+
+func (s *EtcdServer) CorruptionChecker() CorruptionChecker {
+	return s.corruptionChecker
+}