params

Documentation

Overview

Package params defines important constants that are essential to the Ethereum 2.0 services.

Index

• func OverrideBeaconConfig(c *BeaconChainConfig)
• func UseMainnetConfig()
• func UseMinimalConfig()
• type BeaconChainConfig
  • func BeaconConfig() *BeaconChainConfig
  • func MainnetConfig() *BeaconChainConfig
  • func MinimalSpecConfig() *BeaconChainConfig

Functions

func OverrideBeaconConfig

func OverrideBeaconConfig(c *BeaconChainConfig)

OverrideBeaconConfig by replacing the config. The preferred pattern is to call BeaconConfig(), change the specific parameters, and then call OverrideBeaconConfig(c). Any subsequent calls to params.BeaconConfig() will return this new configuration.

func UseMainnetConfig

func UseMainnetConfig()

UseMainnetConfig for beacon chain services.

func UseMinimalConfig

func UseMinimalConfig()

UseMinimalConfig for beacon chain services.

Types

type BeaconChainConfig

type BeaconChainConfig struct {
	// Constants (non-configurable)
	FarFutureEpoch           uint64 `yaml:"FAR_FUTURE_EPOCH"`            // FarFutureEpoch represents a epoch extremely far away in the future used as the default penalization slot for validators.
	BaseRewardsPerEpoch      uint64 `yaml:"BASE_REWARDS_PER_EPOCH"`      // BaseRewardsPerEpoch is used to calculate the per epoch rewards.
	DepositContractTreeDepth uint64 `yaml:"DEPOSIT_CONTRACT_TREE_DEPTH"` // Depth of the Merkle trie of deposits in the validator deposit contract on the PoW chain.
	MinGenesisDelay          uint64 `yaml:"MIN_GENESIS_DELAY"`           // Minimum number of seconds to delay starting the ETH2 genesis. Must be at least 1 second.

	// Misc constants.
	TargetCommitteeSize            uint64 `yaml:"TARGET_COMMITTEE_SIZE"`        // TargetCommitteeSize is the number of validators in a committee when the chain is healthy.
	MaxValidatorsPerCommittee      uint64 `yaml:"MAX_VALIDATORS_PER_COMMITTEE"` // MaxValidatorsPerCommittee defines the upper bound of the size of a committee.
	MaxCommitteesPerSlot           uint64 // MaxCommitteesPerSlot defines the max amount of committee in a single slot.
	MinPerEpochChurnLimit          uint64 `yaml:"MIN_PER_EPOCH_CHURN_LIMIT"`          // MinPerEpochChurnLimit is the minimum amount of churn allotted for validator rotations.
	ChurnLimitQuotient             uint64 `yaml:"CHURN_LIMIT_QUOTIENT"`               // ChurnLimitQuotient is used to determine the limit of how many validators can rotate per epoch.
	ShuffleRoundCount              uint64 `yaml:"SHUFFLE_ROUND_COUNT"`                // ShuffleRoundCount is used for retrieving the permuted index.
	MinGenesisActiveValidatorCount uint64 `yaml:"MIN_GENESIS_ACTIVE_VALIDATOR_COUNT"` // MinGenesisActiveValidatorCount defines how many validator deposits needed to kick off beacon chain.
	MinGenesisTime                 uint64 `yaml:"MIN_GENESIS_TIME"`                   // MinGenesisTime is the time that needed to pass before kicking off beacon chain.
	TargetAggregatorsPerCommittee  uint64 // TargetAggregatorsPerCommittee defines the number of aggregators inside one committee.
	HysteresisQuotient             uint64 // HysteresisQuotient defines the hysteresis quotient for effective balance calculations.
	HysteresisDownwardMultiplier   uint64 // HysteresisDownwardMultiplier defines the hysteresis downward multiplier for effective balance calculations.
	HysteresisUpwardMultiplier     uint64 // HysteresisUpwardMultiplier defines the hysteresis upward multiplier for effective balance calculations.

	// Gwei value constants.
	MinDepositAmount          uint64 `yaml:"MIN_DEPOSIT_AMOUNT"`          // MinDepositAmount is the maximal amount of Gwei a validator can send to the deposit contract at once.
	MaxEffectiveBalance       uint64 `yaml:"MAX_EFFECTIVE_BALANCE"`       // MaxEffectiveBalance is the maximal amount of Gwei that is effective for staking.
	EjectionBalance           uint64 `yaml:"EJECTION_BALANCE"`            // EjectionBalance is the minimal GWei a validator needs to have before ejected.
	EffectiveBalanceIncrement uint64 `yaml:"EFFECTIVE_BALANCE_INCREMENT"` // EffectiveBalanceIncrement is used for converting the high balance into the low balance for validators.

	// Initial value constants.
	BLSWithdrawalPrefixByte byte     `yaml:"BLS_WITHDRAWAL_PREFIX_BYTE"` // BLSWithdrawalPrefixByte is used for BLS withdrawal and it's the first byte.
	ZeroHash                [32]byte // ZeroHash is used to represent a zeroed out 32 byte array.

	// Time parameters constants.
	MinAttestationInclusionDelay     uint64 `yaml:"MIN_ATTESTATION_INCLUSION_DELAY"`     // MinAttestationInclusionDelay defines how many slots validator has to wait to include attestation for beacon block.
	SecondsPerSlot                   uint64 `yaml:"SECONDS_PER_SLOT"`                    // SecondsPerSlot is how many seconds are in a single slot.
	SlotsPerEpoch                    uint64 `yaml:"SLOTS_PER_EPOCH"`                     // SlotsPerEpoch is the number of slots in an epoch.
	MinSeedLookahead                 uint64 `yaml:"MIN_SEED_LOOKAHEAD"`                  // SeedLookahead is the duration of randao look ahead seed.
	MaxSeedLookahead                 uint64 `yaml:"MAX_SEED_LOOKAHEAD"`                  // MaxSeedLookahead is the duration a validator has to wait for entry and exit in epoch.
	EpochsPerEth1VotingPeriod        uint64 `yaml:"EPOCHS_PER_ETH1_VOTING_PERIOD"`       // EpochsPerEth1VotingPeriod defines how often the merkle root of deposit receipts get updated in beacon node on per epoch basis.
	SlotsPerHistoricalRoot           uint64 `yaml:"SLOTS_PER_HISTORICAL_ROOT"`           // SlotsPerHistoricalRoot defines how often the historical root is saved.
	MinValidatorWithdrawabilityDelay uint64 `yaml:"MIN_VALIDATOR_WITHDRAWABILITY_DELAY"` // MinValidatorWithdrawabilityDelay is the shortest amount of time a validator has to wait to withdraw.
	PersistentCommitteePeriod        uint64 `yaml:"PERSISTENT_COMMITTEE_PERIOD"`         // PersistentCommitteePeriod is the minimum amount of epochs a validator must participate before exiting.
	MinEpochsToInactivityPenalty     uint64 `yaml:"MIN_EPOCHS_TO_INACTIVITY_PENALTY"`    // MinEpochsToInactivityPenalty defines the minimum amount of epochs since finality to begin penalizing inactivity.
	Eth1FollowDistance               uint64 // Eth1FollowDistance is the number of eth1.0 blocks to wait before considering a new deposit for voting. This only applies after the chain as been started.
	SafeSlotsToUpdateJustified       uint64 // SafeSlotsToUpdateJustified is the minimal slots needed to update justified check point.
	AttestationPropagationSlotRange  uint64 // AttestationPropagationSlotRange is the maximum number of slots during which an attestation can be propagated.
	SecondsPerETH1Block              uint64 `yaml:"SECONDS_PER_ETH1_BLOCK"` // SecondsPerETH1Block is the approximate time for a single eth1 block to be produced.
	// State list lengths
	EpochsPerHistoricalVector uint64 `yaml:"EPOCHS_PER_HISTORICAL_VECTOR"` // EpochsPerHistoricalVector defines max length in epoch to store old historical stats in beacon state.
	EpochsPerSlashingsVector  uint64 `yaml:"EPOCHS_PER_SLASHINGS_VECTOR"`  // EpochsPerSlashingsVector defines max length in epoch to store old stats to recompute slashing witness.
	HistoricalRootsLimit      uint64 `yaml:"HISTORICAL_ROOTS_LIMIT"`       // HistoricalRootsLimit the define max historical roots can be saved in state before roll over.
	ValidatorRegistryLimit    uint64 `yaml:"VALIDATOR_REGISTRY_LIMIT"`     // ValidatorRegistryLimit defines the upper bound of validators can participate in eth2.

	// Reward and penalty quotients constants.
	BaseRewardFactor            uint64 `yaml:"BASE_REWARD_FACTOR"`            // BaseRewardFactor is used to calculate validator per-slot interest rate.
	WhistleBlowerRewardQuotient uint64 `yaml:"WHISTLEBLOWER_REWARD_QUOTIENT"` // WhistleBlowerRewardQuotient is used to calculate whistler blower reward.
	ProposerRewardQuotient      uint64 `yaml:"PROPOSER_REWARD_QUOTIENT"`      // ProposerRewardQuotient is used to calculate the reward for proposers.
	InactivityPenaltyQuotient   uint64 `yaml:"INACTIVITY_PENALTY_QUOTIENT"`   // InactivityPenaltyQuotient is used to calculate the penalty for a validator that is offline.
	MinSlashingPenaltyQuotient  uint64 `yaml:"MIN_SLASHING_PENALTY_QUOTIENT"` // MinSlashingPenaltyQuotient is used to calculate the minimum penalty to prevent DoS attacks.

	// Max operations per block constants.
	MaxProposerSlashings uint64 `yaml:"MAX_PROPOSER_SLASHINGS"` // MaxProposerSlashings defines the maximum number of slashings of proposers possible in a block.
	MaxAttesterSlashings uint64 `yaml:"MAX_ATTESTER_SLASHINGS"` // MaxAttesterSlashings defines the maximum number of casper FFG slashings possible in a block.
	MaxAttestations      uint64 `yaml:"MAX_ATTESTATIONS"`       // MaxAttestations defines the maximum allowed attestations in a beacon block.
	MaxDeposits          uint64 `yaml:"MAX_DEPOSITS"`           // MaxVoluntaryExits defines the maximum number of validator deposits in a block.
	MaxVoluntaryExits    uint64 `yaml:"MAX_VOLUNTARY_EXITS"`    // MaxVoluntaryExits defines the maximum number of validator exits in a block.

	// BLS domain values.
	DomainBeaconProposer    [4]byte `yaml:"DOMAIN_BEACON_PROPOSER"`     // DomainBeaconProposer defines the BLS signature domain for beacon proposal verification.
	DomainRandao            [4]byte `yaml:"DOMAIN_RANDAO"`              // DomainRandao defines the BLS signature domain for randao verification.
	DomainBeaconAttester    [4]byte `yaml:"DOMAIN_ATTESTATION"`         // DomainBeaconAttester defines the BLS signature domain for attestation verification.
	DomainDeposit           [4]byte `yaml:"DOMAIN_DEPOSIT"`             // DomainDeposit defines the BLS signature domain for deposit verification.
	DomainVoluntaryExit     [4]byte `yaml:"DOMAIN_VOLUNTARY_EXIT"`      // DomainVoluntaryExit defines the BLS signature domain for exit verification.
	DomainSelectionProof    [4]byte `yaml:"DOMAIN_SELECTION_PROOF"`     // DomainSelectionProof defines the BLS signature domain for selection proof.
	DomainAggregateAndProof [4]byte `yaml:"DOMAIN_AGGREGATE_AND_PROOF"` // DomainAggregateAndProof defines the BLS signature domain for aggregate and proof.

	// Prysm constants.
	GweiPerEth                uint64        // GweiPerEth is the amount of gwei corresponding to 1 eth.
	LogBlockDelay             int64         // Number of blocks to wait from the current head before processing logs from the deposit contract.
	BLSSecretKeyLength        int           // BLSSecretKeyLength defines the expected length of BLS secret keys in bytes.
	BLSPubkeyLength           int           // BLSPubkeyLength defines the expected length of BLS public keys in bytes.
	BLSSignatureLength        int           // BLSSignatureLength defines the expected length of BLS signatures in bytes.
	DefaultBufferSize         int           // DefaultBufferSize for channels across the Prysm repository.
	ValidatorPrivkeyFileName  string        // ValidatorPrivKeyFileName specifies the string name of a validator private key file.
	WithdrawalPrivkeyFileName string        // WithdrawalPrivKeyFileName specifies the string name of a withdrawal private key file.
	RPCSyncCheck              time.Duration // Number of seconds to query the sync service, to find out if the node is synced or not.
	GoerliBlockTime           uint64        // GoerliBlockTime is the number of seconds on avg a Goerli block is created.
	EmptySignature            [96]byte      // EmptySignature is used to represent a zeroed out BLS Signature.
	DefaultPageSize           int           // DefaultPageSize defines the default page size for RPC server request.
	MaxPeersToSync            int           // MaxPeersToSync describes the limit for number of peers in round robin sync.
	SlotsPerArchivedPoint     uint64        // SlotsPerArchivedPoint defines the number of slots per one archived point.

	// Slasher constants.
	WeakSubjectivityPeriod    uint64 // WeakSubjectivityPeriod defines the time period expressed in number of epochs were proof of stake network should validate block headers and attestations for slashable events.
	PruneSlasherStoragePeriod uint64 // PruneSlasherStoragePeriod defines the time period expressed in number of epochs were proof of stake network should prune attestation and block header store.

	// Fork-related values.
	GenesisForkVersion  []byte            `yaml:"GENESIS_FORK_VERSION"` // GenesisForkVersion is used to track fork version between state transitions.
	NextForkVersion     []byte            `yaml:"NEXT_FORK_VERSION"`    // NextForkVersion is used to track the upcoming fork version, if any.
	NextForkEpoch       uint64            `yaml:"NEXT_FORK_EPOCH"`      // NextForkEpoch is used to track the epoch of the next fork, if any.
	ForkVersionSchedule map[uint64][]byte // Schedule of fork versions by epoch number.
}

BeaconChainConfig contains constant configs for node to participate in beacon chain.

func BeaconConfig

func BeaconConfig() *BeaconChainConfig

BeaconConfig retrieves beacon chain config.

func MainnetConfig

func MainnetConfig() *BeaconChainConfig

MainnetConfig returns the default config to be used in the mainnet.

func MinimalSpecConfig

func MinimalSpecConfig() *BeaconChainConfig

MinimalSpecConfig retrieves the minimal config used in spec tests.