Add the config option to forge batch when the coordinator we are not the auction winner and reach the slot deadline

coordinator/coordinator.go

@@ -84,6 +84,9 @@ type Config struct {
 	// to 0s, the coordinator will continuously forge even if the batches
 	// are empty.
 	ForgeNoTxsDelay time.Duration
+	// MustForgeAtSlotDeadline enables the coordinator to forge slots if
+	// the empty slots reach the slot deadline.
+	MustForgeAtSlotDeadline bool
 	// SyncRetryInterval is the waiting interval between calls to the main
 	// handler of a synced block after an error
 	SyncRetryInterval time.Duration
@@ -318,7 +321,8 @@ func (c *Coordinator) syncSCVars(vars synchronizer.SCVariablesPtr) {
 }
 
 func canForge(auctionConstants *common.AuctionConstants, auctionVars *common.AuctionVariables,
-	currentSlot *common.Slot, nextSlot *common.Slot, addr ethCommon.Address, blockNum int64) bool {
+	currentSlot *common.Slot, nextSlot *common.Slot, addr ethCommon.Address, blockNum int64,
+	mustForgeAtDeadline bool) bool {
 	if blockNum < auctionConstants.GenesisBlockNum {
 		log.Infow("canForge: requested blockNum is < genesis", "blockNum", blockNum,
 			"genesis", auctionConstants.GenesisBlockNum)
@@ -343,7 +347,7 @@ func canForge(auctionConstants *common.AuctionConstants, auctionVars *common.Auc
 			"block", blockNum)
 		anyoneForge = true
 	}
-	if slot.Forger == addr || anyoneForge {
+	if slot.Forger == addr || (anyoneForge && mustForgeAtDeadline) {
 		return true
 	}
 	log.Debugw("canForge: can't forge", "slot.Forger", slot.Forger)
@@ -353,14 +357,14 @@ func canForge(auctionConstants *common.AuctionConstants, auctionVars *common.Auc
 func (c *Coordinator) canForgeAt(blockNum int64) bool {
 	return canForge(&c.consts.Auction, &c.vars.Auction,
 		&c.stats.Sync.Auction.CurrentSlot, &c.stats.Sync.Auction.NextSlot,
-		c.cfg.ForgerAddress, blockNum)
+		c.cfg.ForgerAddress, blockNum, c.cfg.MustForgeAtSlotDeadline)
 }
 
 func (c *Coordinator) canForge() bool {
 	blockNum := c.stats.Eth.LastBlock.Num + 1
 	return canForge(&c.consts.Auction, &c.vars.Auction,
 		&c.stats.Sync.Auction.CurrentSlot, &c.stats.Sync.Auction.NextSlot,
-		c.cfg.ForgerAddress, blockNum)
+		c.cfg.ForgerAddress, blockNum, c.cfg.MustForgeAtSlotDeadline)
 }
 
 func (c *Coordinator) syncStats(ctx context.Context, stats *synchronizer.Stats) error {

coordinator/coordinator_test.go

@@ -159,14 +159,15 @@ func newTestCoordinator(t *testing.T, forgerAddr ethCommon.Address, ethClient *t
 	deleteme = append(deleteme, debugBatchPath)
 
 	conf := Config{
-		ForgerAddress:          forgerAddr,
-		ConfirmBlocks:          5,
-		L1BatchTimeoutPerc:     0.5,
-		EthClientAttempts:      5,
-		SyncRetryInterval:      400 * time.Microsecond,
-		EthClientAttemptsDelay: 100 * time.Millisecond,
-		TxManagerCheckInterval: 300 * time.Millisecond,
-		DebugBatchPath:         debugBatchPath,
+		ForgerAddress:           forgerAddr,
+		ConfirmBlocks:           5,
+		L1BatchTimeoutPerc:      0.5,
+		EthClientAttempts:       5,
+		SyncRetryInterval:       400 * time.Microsecond,
+		EthClientAttemptsDelay:  100 * time.Millisecond,
+		TxManagerCheckInterval:  300 * time.Millisecond,
+		DebugBatchPath:          debugBatchPath,
+		MustForgeAtSlotDeadline: true,
 		Purger: PurgerCfg{
 			PurgeBatchDelay:      10,
 			PurgeBlockDelay:      10,
@@ -391,6 +392,10 @@ func TestCoordCanForge(t *testing.T) {
 	assert.Equal(t, true, coord.canForge())
 	assert.Equal(t, true, bootCoord.canForge())
 
+	// Anyone can forge but the node MustForgeAtSlotDeadline as set as false
+	coord.cfg.MustForgeAtSlotDeadline = false
+	assert.Equal(t, false, coord.canForge())
+
 	// Slot 3. coordinator bid, so the winner is the coordinator
 	stats.Eth.LastBlock.Num = ethClientSetup.AuctionConstants.GenesisBlockNum +
 		3*int64(ethClientSetup.AuctionConstants.BlocksPerSlot)

coordinator/txmanager.go

@@ -608,7 +608,7 @@ func (t *TxManager) removeBadBatchInfos(ctx context.Context) error {
 func (t *TxManager) canForgeAt(blockNum int64) bool {
 	return canForge(&t.consts.Auction, &t.vars.Auction,
 		&t.stats.Sync.Auction.CurrentSlot, &t.stats.Sync.Auction.NextSlot,
-		t.cfg.ForgerAddress, blockNum)
+		t.cfg.ForgerAddress, blockNum, t.cfg.MustForgeAtSlotDeadline)
 }
 
 func (t *TxManager) mustL1L2Batch(blockNum int64) bool {