feat(proposer): add a --minimalBlockGasLimit flag to mitigate the p…

…otential gas estimation issue (taikoxyz#225)

Co-authored-by: jeff <[email protected]>

cmd/flags/proposer.go

@@ -45,6 +45,11 @@ var (
 		Usage:    "Time interval to propose empty blocks",
 		Category: proposerCategory,
 	}
+	MinBlockGasLimit = &cli.Uint64Flag{
+		Name:     "minimalBlockGasLimit",
+		Usage:    "Minimal block gasLimit when proposing a block",
+		Category: proposerCategory,
+	}
 )
 
 // All proposer flags.
@@ -56,4 +61,5 @@ var ProposerFlags = MergeFlags(CommonFlags, []cli.Flag{
 	CommitSlot,
 	TxPoolLocals,
 	ProposeEmptyBlocksInterval,
+	MinBlockGasLimit,
 })

proposer/config.go

@@ -24,6 +24,7 @@ type Config struct {
 	CommitSlot                 uint64
 	LocalAddresses             []common.Address
 	ProposeEmptyBlocksInterval *time.Duration
+	MinBlockGasLimit           uint64
 }
 
 // NewConfigFromCliContext initializes a Config instance from
@@ -81,5 +82,6 @@ func NewConfigFromCliContext(c *cli.Context) (*Config, error) {
 		CommitSlot:                 c.Uint64(flags.CommitSlot.Name),
 		LocalAddresses:             localAddresses,
 		ProposeEmptyBlocksInterval: proposeEmptyBlocksInterval,
+		MinBlockGasLimit:           c.Uint64(flags.MinBlockGasLimit.Name),
 	}, nil
 }

proposer/proposer.go

@@ -45,6 +45,7 @@ type Proposer struct {
 	proposingTimer             *time.Timer
 	commitSlot                 uint64
 	locals                     []common.Address
+	minBlockGasLimit           *uint64
 
 	// Protocol configurations
 	protocolConfigs *bindings.TaikoDataConfig
@@ -96,6 +97,17 @@ func InitFromConfig(ctx context.Context, p *Proposer, cfg *Config) (err error) {
 	}
 	p.protocolConfigs = &protocolConfigs
 
+	if cfg.MinBlockGasLimit != 0 {
+		if cfg.MinBlockGasLimit > p.protocolConfigs.BlockMaxGasLimit.Uint64() {
+			return fmt.Errorf(
+				"minimal block gas limit too large, set: %d, limit: %d",
+				cfg.MinBlockGasLimit,
+				p.protocolConfigs.BlockMaxGasLimit,
+			)
+		}
+		p.minBlockGasLimit = &cfg.MinBlockGasLimit
+	}
+
 	log.Info("Protocol configs", "configs", p.protocolConfigs)
 
 	return nil
@@ -229,6 +241,10 @@ func (p *Proposer) ProposeTxList(
 	txListBytes []byte,
 	txNum uint,
 ) error {
+	if p.minBlockGasLimit != nil && meta.GasLimit < uint32(*p.minBlockGasLimit) {
+		meta.GasLimit = uint32(*p.minBlockGasLimit)
+	}
+
 	// Propose the transactions list
 	inputs, err := encoding.EncodeProposeBlockInput(meta)
 	if err != nil {