[#478] innerring: Use dynamic epoch duration in epoch timer

Signed-off-by: Alex Vanin <alexey@nspcc.ru>

pkg/innerring/blocktimer.go

@@ -29,7 +29,7 @@ type (
 		cnrWrapper *container.Wrapper // to invoke stop container estimation
 		epoch      epochState         // to specify which epoch to stop
 
-		epochDuration      uint32 // in blocks
+		epochDuration      timers.BlockMeter // in blocks
 		stopEstimationDMul uint32            // X: X/Y of epoch in blocks
 		stopEstimationDDiv uint32            // Y: X/Y of epoch in blocks
 
@@ -74,7 +74,7 @@ func (s *Server) tickTimers() {
 
 func newEpochTimer(args *epochTimerArgs) *timers.BlockTimer {
 	epochTimer := timers.NewBlockTimer(
-		timers.StaticBlockMeter(args.epochDuration),
+		args.epochDuration,
 		func() {
 			args.nm.HandleNewEpochTick(timers.NewEpochTick{})
 		},

pkg/innerring/config/config.go

@@ -46,3 +46,17 @@ func (c *GlobalConfig) AuditFee() (uint64, error) {
 
 	return c.nm.AuditFee()
 }
+
+func (c *GlobalConfig) EpochDuration() (uint32, error) {
+	value := c.cfg.GetUint32("timers.epoch")
+	if value != 0 {
+		return value, nil
+	}
+
+	epochDuration, err := c.nm.EpochDuration()
+	if err != nil {
+		return 0, err
+	}
+
+	return uint32(epochDuration), nil
+}

pkg/innerring/innerring.go

@@ -585,7 +585,7 @@ func New(ctx context.Context, log *zap.Logger, cfg *viper.Viper) (*Server, error
 		nm:                 netmapProcessor,
 		cnrWrapper:         cnrClient,
 		epoch:              server,
-		epochDuration:      cfg.GetUint32("timers.epoch"),
+		epochDuration:      globalConfig.EpochDuration,
 		stopEstimationDMul: cfg.GetUint32("timers.stop_estimation.mul"),
 		stopEstimationDDiv: cfg.GetUint32("timers.stop_estimation.div"),
 		collectBasicIncome: subEpochEventHandler{