params: add blob schedule config

params/config.go

@@ -327,8 +327,9 @@ type ChainConfig struct {
 	DepositContractAddress common.Address `json:"depositContractAddress,omitempty"`
 
 	// Various consensus engines
-	Ethash *EthashConfig `json:"ethash,omitempty"`
-	Clique *CliqueConfig `json:"clique,omitempty"`
+	Ethash             *EthashConfig       `json:"ethash,omitempty"`
+	Clique             *CliqueConfig       `json:"clique,omitempty"`
+	BlobScheduleConfig *BlobScheduleConfig `json:"blobSchedule,omitempty"`
 }
 
 // EthashConfig is the consensus engine configs for proof-of-work based sealing.
@@ -425,6 +426,59 @@ func (c *ChainConfig) Description() string {
 	return banner
 }
 
+// BlobConfig specifies the target and max blobs per block for the associated
+// fork.
+type BlobConfig struct {
+	Target uint64 `json:"target"`
+	Max    uint64 `json:"max"`
+}
+
+// BlobScheduleConfig determines target and max number of blobs allow per fork.
+type BlobScheduleConfig struct {
+	Cancun *BlobConfig `json:"cancun,omitempty"`
+	Prague *BlobConfig `json:"prague,omitempty"`
+}
+
+// LatestTargetBlobsPerBlock returns the target blobs per block associated with
+// requested time.
+func (c *ChainConfig) LatestTargetBlobsPerBlock(time uint64) uint64 {
+	if c.BlobScheduleConfig == nil {
+		panic("blob schedule not defined")
+	}
+	var (
+		london = c.LondonBlock
+		s      = c.BlobScheduleConfig
+	)
+	switch {
+	case c.IsPrague(london, time) && s.Prague != nil:
+		return s.Prague.Target
+	case c.IsCancun(london, time) && s.Cancun != nil:
+		return s.Cancun.Target
+	default:
+		return 0
+	}
+}
+
+// LatestMaxBlobsPerBlock returns the max blobs per block associated with
+// requested time.
+func (c *ChainConfig) LatestMaxBlobsPerBlock(time uint64) uint64 {
+	if c.BlobScheduleConfig == nil {
+		panic("blob schedule not defined")
+	}
+	var (
+		london = c.LondonBlock
+		s      = c.BlobScheduleConfig
+	)
+	switch {
+	case c.IsPrague(london, time) && s.Prague != nil:
+		return s.Prague.Max
+	case c.IsCancun(london, time) && s.Cancun != nil:
+		return s.Cancun.Max
+	default:
+		return 0
+	}
+}
+
 // IsHomestead returns whether num is either equal to the homestead block or greater.
 func (c *ChainConfig) IsHomestead(num *big.Int) bool {
 	return isBlockForked(c.HomesteadBlock, num)