builder

Genesis Builder

This package provides genesis building functionality for Lux networks. It depends on node types and is responsible for converting genesis configuration into actual genesis bytes.

Architecture

The genesis builder bridges the gap between the decoupled github.com/luxfi/genesis package (which provides JSON-based configuration) and the node's internal types:

github.com/luxfi/genesis          →  github.com/luxfi/node/genesis/builder
(JSON config, no node deps)           (Type conversion, genesis building)

Types

StakingConfig

type StakingConfig struct {
    UptimeRequirement float64
    MinValidatorStake uint64
    MaxValidatorStake uint64
    MinDelegatorStake uint64
    MinDelegationFee  uint32
    MinStakeDuration  time.Duration  // Converted from uint64 seconds
    MaxStakeDuration  time.Duration  // Converted from uint64 seconds
    RewardConfig      reward.Config  // Uses platformvm/reward.Config

    // BLS key information for genesis replay
    NodeID               string
    BLSPublicKey         []byte
    BLSProofOfPossession []byte
}

TxFeeConfig

type TxFeeConfig struct {
    TxFee              uint64
    CreateAssetTxFee   uint64
    DynamicFeeConfig   gas.Config  // From vms/components/gas
    ValidatorFeeConfig fee.Config  // From vms/platformvm/validators/fee
}

Bootstrapper

type Bootstrapper struct {
    ID ids.NodeID      // Parsed from string
    IP netip.AddrPort  // Parsed from string
}

Functions

Configuration Retrieval

// Get staking config with time.Duration types
func GetStakingConfig(networkID uint32) StakingConfig

// Get tx fee config with gas.Config and fee.Config
func GetTxFeeConfig(networkID uint32) TxFeeConfig

// Get parsed bootstrappers
func GetBootstrappers(networkID uint32) ([]Bootstrapper, error)

// Sample random bootstrappers
func SampleBootstrappers(networkID uint32, count int) ([]Bootstrapper, error)

// Get genesis config (delegates to genesis package)
func GetConfig(networkID uint32) *genesiscfg.Config

Genesis Building

// Build genesis bytes from config
func FromConfig(config *genesiscfg.Config) ([]byte, ids.ID, error)

// Build genesis from file
func FromFile(networkID uint32, filepath string, stakingCfg *StakingConfig) ([]byte, ids.ID, error)

// Build genesis from base64 content
func FromFlag(networkID uint32, genesisContent string, stakingCfg *StakingConfig) ([]byte, ids.ID, error)

// Build genesis for database replay mode
func FromDatabase(networkID uint32, dbPath string, dbType string, stakingCfg *StakingConfig) ([]byte, ids.ID, error)

Helpers

// Get VM genesis transaction
func VMGenesis(genesisBytes []byte, vmID ids.ID) (*pchaintxs.Tx, error)

// Get chain and API aliases
func Aliases(genesisBytes []byte) (map[string][]string, map[ids.ID][]string, error)

// Get LUX asset ID from XVM genesis
func XAssetID(xvmGenesisBytes []byte) (ids.ID, error)

Default Fee Configurations

The package provides default fee configurations for each network:

// Dynamic fee configs
var MainnetDynamicFeeConfig gas.Config
var TestnetDynamicFeeConfig gas.Config
var LocalDynamicFeeConfig   gas.Config

// Validator fee configs
var MainnetValidatorFeeConfig fee.Config
var TestnetValidatorFeeConfig fee.Config
var LocalValidatorFeeConfig   fee.Config

VM Aliases

var VMAliases = map[ids.ID][]string{
    constants.PlatformVMID: {"protocol"}, // upstream constant still PlatformVMID; alias is "protocol"
    constants.XVMID:        {"xvm"},
    constants.EVMID:        {"evm"},
    secp256k1fx.ID:         {"secp256k1fx"},
    nftfx.ID:               {"nftfx"},
    propertyfx.ID:          {"propertyfx"},
}

Usage Example

package main

import (
    "github.com/luxfi/node/genesis/builder"
    "github.com/luxfi/constants"
)

func main() {
    // Get network configuration
    stakingCfg := builder.GetStakingConfig(constants.MainnetID)
    txFeeCfg := builder.GetTxFeeConfig(constants.MainnetID)

    // Get bootstrappers
    bootstrappers, err := builder.SampleBootstrappers(constants.MainnetID, 5)
    if err != nil {
        panic(err)
    }

    // Build genesis bytes
    config := builder.GetConfig(constants.MainnetID)
    genesisBytes, xAssetID, err := builder.FromConfig(config)
    if err != nil {
        panic(err)
    }

    // Get chain aliases
    apiAliases, chainAliases, err := builder.Aliases(genesisBytes)
    if err != nil {
        panic(err)
    }
}

Migration from genesis package

If you were using github.com/luxfi/genesis v1.2.x for building genesis bytes, migrate to this package:

For JSON-based configuration only (without building), continue using github.com/luxfi/genesis v1.3.x.

License

Copyright (C) 2019-2025, Lux Industries, Inc. All rights reserved. See the file LICENSE for licensing terms.