bor producer change delay

cmd/puppeth/wizard_genesis.go

@@ -109,6 +109,7 @@ func (w *wizard) makeGenesis() {
 		genesis.Config.Bor = &params.BorConfig{
 			Period:           1,
 			ProducerInterval: 60,
+			ProducerDelay:    5,
 			Epoch:            30000,
 		}
 	default:

consensus/bor/bor.go

@@ -190,6 +190,16 @@ func CalcDifficulty(snap *Snapshot, signer common.Address, producerPeriod uint64
 	return new(big.Int).Set(diffNoTurn)
 }
 
+// CalcProducerDelay is the producer delay algorithm based on block time.
+func CalcProducerDelay(snap *Snapshot, producerInterval uint64, producerDelay uint64) uint64 {
+	isFirstBlock := (snap.Number + 1) % producerInterval
+	if isFirstBlock == 0 {
+		return producerDelay
+	}
+
+	return 0
+}
+
 // BorRLP returns the rlp bytes which needs to be signed for the bor
 // sealing. The RLP to sign consists of the entire header apart from the 65 byte signature
 // contained at the end of the extra data.
@@ -576,7 +586,7 @@ func (c *Bor) Prepare(chain consensus.ChainReader, header *types.Header) error {
 	if parent == nil {
 		return consensus.ErrUnknownAncestor
 	}
-	header.Time = parent.Time + c.config.Period
+	header.Time = parent.Time + c.config.Period + CalcProducerDelay(snap, c.config.ProducerInterval, c.config.ProducerDelay)
 	if header.Time < uint64(time.Now().Unix()) {
 		header.Time = uint64(time.Now().Unix())
 	}

params/config.go

@@ -230,6 +230,7 @@ func (c *CliqueConfig) String() string {
 type BorConfig struct {
 	Period           uint64 `json:"period"`           // Number of seconds between blocks to enforce
 	ProducerInterval uint64 `json:"producerInterval"` // Number of seconds between change in block producer interval to enforce
+	ProducerDelay    uint64 `json:"producerDelay"`    // Number of seconds delay between two producer interval
 	Epoch            uint64 `json:"epoch"`            // Epoch length to reset votes and checkpoint
 }