mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 12:57:18 +00:00
102 lines
4.0 KiB
Go
102 lines
4.0 KiB
Go
package blocks
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import (
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"context"
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"fmt"
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"github.com/prysmaticlabs/prysm/shared/params"
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"github.com/gogo/protobuf/proto"
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"github.com/pkg/errors"
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ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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v "github.com/prysmaticlabs/prysm/beacon-chain/core/validators"
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stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
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)
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// ProcessProposerSlashings is one of the operations performed
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// on each processed beacon block to slash proposers based on
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// slashing conditions if any slashable events occurred.
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//
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// Spec pseudocode definition:
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// def process_proposer_slashing(state: BeaconState, proposer_slashing: ProposerSlashing) -> None:
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// """
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// Process ``ProposerSlashing`` operation.
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// """
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// proposer = state.validator_registry[proposer_slashing.proposer_index]
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// # Verify slots match
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// assert proposer_slashing.header_1.slot == proposer_slashing.header_2.slot
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// # But the headers are different
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// assert proposer_slashing.header_1 != proposer_slashing.header_2
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// # Check proposer is slashable
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// assert is_slashable_validator(proposer, get_current_epoch(state))
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// # Signatures are valid
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// for header in (proposer_slashing.header_1, proposer_slashing.header_2):
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// domain = get_domain(state, DOMAIN_BEACON_PROPOSER, slot_to_epoch(header.slot))
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// assert bls_verify(proposer.pubkey, signing_root(header), header.signature, domain)
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//
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// slash_validator(state, proposer_slashing.proposer_index)
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func ProcessProposerSlashings(
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_ context.Context,
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beaconState *stateTrie.BeaconState,
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b *ethpb.SignedBeaconBlock,
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) (*stateTrie.BeaconState, error) {
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if err := helpers.VerifyNilBeaconBlock(b); err != nil {
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return nil, err
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}
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body := b.Block.Body
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var err error
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for idx, slashing := range body.ProposerSlashings {
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if slashing == nil {
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return nil, errors.New("nil proposer slashings in block body")
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}
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if err = VerifyProposerSlashing(beaconState, slashing); err != nil {
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return nil, errors.Wrapf(err, "could not verify proposer slashing %d", idx)
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}
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beaconState, err = v.SlashValidator(
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beaconState, slashing.Header_1.Header.ProposerIndex,
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)
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if err != nil {
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return nil, errors.Wrapf(err, "could not slash proposer index %d", slashing.Header_1.Header.ProposerIndex)
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}
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}
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return beaconState, nil
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}
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// VerifyProposerSlashing verifies that the data provided from slashing is valid.
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func VerifyProposerSlashing(
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beaconState *stateTrie.BeaconState,
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slashing *ethpb.ProposerSlashing,
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) error {
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if slashing.Header_1 == nil || slashing.Header_1.Header == nil || slashing.Header_2 == nil || slashing.Header_2.Header == nil {
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return errors.New("nil header cannot be verified")
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}
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hSlot := slashing.Header_1.Header.Slot
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if hSlot != slashing.Header_2.Header.Slot {
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return fmt.Errorf("mismatched header slots, received %d == %d", slashing.Header_1.Header.Slot, slashing.Header_2.Header.Slot)
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}
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pIdx := slashing.Header_1.Header.ProposerIndex
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if pIdx != slashing.Header_2.Header.ProposerIndex {
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return fmt.Errorf("mismatched indices, received %d == %d", slashing.Header_1.Header.ProposerIndex, slashing.Header_2.Header.ProposerIndex)
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}
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if proto.Equal(slashing.Header_1.Header, slashing.Header_2.Header) {
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return errors.New("expected slashing headers to differ")
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}
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proposer, err := beaconState.ValidatorAtIndexReadOnly(slashing.Header_1.Header.ProposerIndex)
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if err != nil {
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return err
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}
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if !helpers.IsSlashableValidatorUsingTrie(proposer, helpers.CurrentEpoch(beaconState)) {
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return fmt.Errorf("validator with key %#x is not slashable", proposer.PublicKey())
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}
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headers := []*ethpb.SignedBeaconBlockHeader{slashing.Header_1, slashing.Header_2}
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for _, header := range headers {
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if err := helpers.ComputeDomainVerifySigningRoot(beaconState, pIdx, helpers.SlotToEpoch(hSlot),
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header.Header, params.BeaconConfig().DomainBeaconProposer, header.Signature); err != nil {
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return errors.Wrap(err, "could not verify beacon block header")
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}
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}
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return nil
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}
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