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deposit.go
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deposit.go
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package blocks
import (
"context"
"fmt"
"github.com/pkg/errors"
ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
"github.com/prysmaticlabs/go-ssz"
"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
"github.com/prysmaticlabs/prysm/shared/bls"
"github.com/prysmaticlabs/prysm/shared/bytesutil"
"github.com/prysmaticlabs/prysm/shared/depositutil"
"github.com/prysmaticlabs/prysm/shared/mathutil"
"github.com/prysmaticlabs/prysm/shared/params"
"github.com/prysmaticlabs/prysm/shared/trieutil"
)
// ProcessPreGenesisDeposits processes a deposit for the beacon state before chainstart.
func ProcessPreGenesisDeposits(
ctx context.Context,
beaconState *stateTrie.BeaconState,
deposits []*ethpb.Deposit,
) (*stateTrie.BeaconState, error) {
var err error
beaconState, err = ProcessDeposits(ctx, beaconState, deposits)
if err != nil {
return nil, errors.Wrap(err, "could not process deposit")
}
for _, deposit := range deposits {
pubkey := deposit.Data.PublicKey
index, ok := beaconState.ValidatorIndexByPubkey(bytesutil.ToBytes48(pubkey))
if !ok {
return beaconState, nil
}
balance, err := beaconState.BalanceAtIndex(index)
if err != nil {
return nil, err
}
validator, err := beaconState.ValidatorAtIndex(index)
if err != nil {
return nil, err
}
validator.EffectiveBalance = mathutil.Min(balance-balance%params.BeaconConfig().EffectiveBalanceIncrement, params.BeaconConfig().MaxEffectiveBalance)
if validator.EffectiveBalance ==
params.BeaconConfig().MaxEffectiveBalance {
validator.ActivationEligibilityEpoch = 0
validator.ActivationEpoch = 0
}
if err := beaconState.UpdateValidatorAtIndex(index, validator); err != nil {
return nil, err
}
}
return beaconState, nil
}
// ProcessDeposits is one of the operations performed on each processed
// beacon block to verify queued validators from the Ethereum 1.0 Deposit Contract
// into the beacon chain.
//
// Spec pseudocode definition:
// For each deposit in block.body.deposits:
// process_deposit(state, deposit)
func ProcessDeposits(
ctx context.Context,
beaconState *stateTrie.BeaconState,
deposits []*ethpb.Deposit,
) (*stateTrie.BeaconState, error) {
var err error
domain, err := helpers.ComputeDomain(params.BeaconConfig().DomainDeposit, nil, nil)
if err != nil {
return nil, err
}
// Attempt to verify all deposit signatures at once, if this fails then fall back to processing
// individual deposits with signature verification enabled.
var verifySignature bool
if err := verifyDepositDataWithDomain(ctx, deposits, domain); err != nil {
log.WithError(err).Debug("Failed to verify deposit data, verifying signatures individually")
verifySignature = true
}
for _, deposit := range deposits {
if deposit == nil || deposit.Data == nil {
return nil, errors.New("got a nil deposit in block")
}
beaconState, err = ProcessDeposit(beaconState, deposit, verifySignature)
if err != nil {
return nil, errors.Wrapf(err, "could not process deposit from %#x", bytesutil.Trunc(deposit.Data.PublicKey))
}
}
return beaconState, nil
}
// ProcessDeposit takes in a deposit object and inserts it
// into the registry as a new validator or balance change.
//
// Spec pseudocode definition:
// def process_deposit(state: BeaconState, deposit: Deposit) -> None:
// # Verify the Merkle branch
// assert is_valid_merkle_branch(
// leaf=hash_tree_root(deposit.data),
// branch=deposit.proof,
// depth=DEPOSIT_CONTRACT_TREE_DEPTH + 1, # Add 1 for the List length mix-in
// index=state.eth1_deposit_index,
// root=state.eth1_data.deposit_root,
// )
//
// # Deposits must be processed in order
// state.eth1_deposit_index += 1
//
// pubkey = deposit.data.pubkey
// amount = deposit.data.amount
// validator_pubkeys = [v.pubkey for v in state.validators]
// if pubkey not in validator_pubkeys:
// # Verify the deposit signature (proof of possession) which is not checked by the deposit contract
// deposit_message = DepositMessage(
// pubkey=deposit.data.pubkey,
// withdrawal_credentials=deposit.data.withdrawal_credentials,
// amount=deposit.data.amount,
// )
// domain = compute_domain(DOMAIN_DEPOSIT) # Fork-agnostic domain since deposits are valid across forks
// signing_root = compute_signing_root(deposit_message, domain)
// if not bls.Verify(pubkey, signing_root, deposit.data.signature):
// return
//
// # Add validator and balance entries
// state.validators.append(get_validator_from_deposit(state, deposit))
// state.balances.append(amount)
// else:
// # Increase balance by deposit amount
// index = ValidatorIndex(validator_pubkeys.index(pubkey))
// increase_balance(state, index, amount)
func ProcessDeposit(beaconState *stateTrie.BeaconState, deposit *ethpb.Deposit, verifySignature bool) (*stateTrie.BeaconState, error) {
if err := verifyDeposit(beaconState, deposit); err != nil {
if deposit == nil || deposit.Data == nil {
return nil, err
}
return nil, errors.Wrapf(err, "could not verify deposit from %#x", bytesutil.Trunc(deposit.Data.PublicKey))
}
if err := beaconState.SetEth1DepositIndex(beaconState.Eth1DepositIndex() + 1); err != nil {
return nil, err
}
pubKey := deposit.Data.PublicKey
amount := deposit.Data.Amount
index, ok := beaconState.ValidatorIndexByPubkey(bytesutil.ToBytes48(pubKey))
if !ok {
if verifySignature {
domain, err := helpers.ComputeDomain(params.BeaconConfig().DomainDeposit, nil, nil)
if err != nil {
return nil, err
}
depositSig := deposit.Data.Signature
if err := verifyDepositDataSigningRoot(deposit.Data, pubKey, depositSig, domain); err != nil {
// Ignore this error as in the spec pseudo code.
log.Debugf("Skipping deposit: could not verify deposit data signature: %v", err)
return beaconState, nil
}
}
effectiveBalance := amount - (amount % params.BeaconConfig().EffectiveBalanceIncrement)
if params.BeaconConfig().MaxEffectiveBalance < effectiveBalance {
effectiveBalance = params.BeaconConfig().MaxEffectiveBalance
}
if err := beaconState.AppendValidator(ðpb.Validator{
PublicKey: pubKey,
WithdrawalCredentials: deposit.Data.WithdrawalCredentials,
ActivationEligibilityEpoch: params.BeaconConfig().FarFutureEpoch,
ActivationEpoch: params.BeaconConfig().FarFutureEpoch,
ExitEpoch: params.BeaconConfig().FarFutureEpoch,
WithdrawableEpoch: params.BeaconConfig().FarFutureEpoch,
EffectiveBalance: effectiveBalance,
}); err != nil {
return nil, err
}
if err := beaconState.AppendBalance(amount); err != nil {
return nil, err
}
} else if err := helpers.IncreaseBalance(beaconState, index, amount); err != nil {
return nil, err
}
return beaconState, nil
}
func verifyDeposit(beaconState *stateTrie.BeaconState, deposit *ethpb.Deposit) error {
// Verify Merkle proof of deposit and deposit trie root.
if deposit == nil || deposit.Data == nil {
return errors.New("received nil deposit or nil deposit data")
}
eth1Data := beaconState.Eth1Data()
if eth1Data == nil {
return errors.New("received nil eth1data in the beacon state")
}
receiptRoot := eth1Data.DepositRoot
leaf, err := ssz.HashTreeRoot(deposit.Data)
if err != nil {
return errors.Wrap(err, "could not tree hash deposit data")
}
if ok := trieutil.VerifyMerkleBranch(
receiptRoot,
leaf[:],
int(beaconState.Eth1DepositIndex()),
deposit.Proof,
); !ok {
return fmt.Errorf(
"deposit merkle branch of deposit root did not verify for root: %#x",
receiptRoot,
)
}
return nil
}
// Deprecated: This method uses deprecated ssz.SigningRoot.
func verifyDepositDataSigningRoot(obj *ethpb.Deposit_Data, pub []byte, signature []byte, domain []byte) error {
return depositutil.VerifyDepositSignature(obj, domain)
}
func verifyDepositDataWithDomain(ctx context.Context, deps []*ethpb.Deposit, domain []byte) error {
if len(deps) == 0 {
return nil
}
pks := make([]bls.PublicKey, len(deps))
sigs := make([]bls.Signature, len(deps))
msgs := make([][32]byte, len(deps))
for i, dep := range deps {
if ctx.Err() != nil {
return ctx.Err()
}
if dep == nil || dep.Data == nil {
return errors.New("nil deposit")
}
dpk, err := bls.PublicKeyFromBytes(dep.Data.PublicKey)
if err != nil {
return err
}
pks[i] = dpk
dsig, err := bls.SignatureFromBytes(dep.Data.Signature)
if err != nil {
return err
}
sigs[i] = dsig
root, err := ssz.SigningRoot(dep.Data)
if err != nil {
return errors.Wrap(err, "could not get signing root")
}
signingData := &pb.SigningData{
ObjectRoot: root[:],
Domain: domain,
}
ctrRoot, err := ssz.HashTreeRoot(signingData)
if err != nil {
return errors.Wrap(err, "could not get container root")
}
msgs[i] = ctrRoot
}
verify, err := bls.VerifyMultipleSignatures(sigs, msgs, pks)
if err != nil {
return errors.Errorf("could not verify multiple signatures: %v", err)
}
if !verify {
return errors.New("one or more deposit signatures did not verify")
}
return nil
}