prysm-pulse/beacon-chain/core/blocks/eth1_data.go
Victor Farazdagi a8e501b3cf
ETH2 Types: Epoch (#8373)
* update deps

* update deps

* update protos/*

* update deps

* reset protos

* update protos

* update shared/params/config

* update protos

* update /shared

* update shared/slotutil and shared/testutil

* update beacon-chain/core/helpers

* updates beacon-chain/state

* update beacon-chain/forkchoice

* update beacon-chain/blockchain

* update beacon-chain/cache

* update beacon-chain/core

* update beacon-chain/db

* update beacon-chain/node

* update beacon-chain/p2p

* update beacon-chain/rpc

* update beacon-chain/sync

* go mod tidy

* make sure that beacon-chain build suceeds

* go fmt

* update e2e tests

* update slasher

* remove redundant alias

* update validator

* gazelle

* fix build errors in unit tests

* go fmt

* update deps

* update fuzz/BUILD.bazel

* fix unit tests

* more unit test fixes

* fix blockchain UTs

* more unit test fixes
2021-02-09 10:05:22 +00:00

77 lines
2.5 KiB
Go

package blocks
import (
"bytes"
"context"
"errors"
ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
stateTrie "github.com/prysmaticlabs/prysm/beacon-chain/state"
"github.com/prysmaticlabs/prysm/shared/params"
)
// ProcessEth1DataInBlock is an operation performed on each
// beacon block to ensure the ETH1 data votes are processed
// into the beacon state.
//
// Official spec definition:
// def process_eth1_data(state: BeaconState, body: BeaconBlockBody) -> None:
// state.eth1_data_votes.append(body.eth1_data)
// if state.eth1_data_votes.count(body.eth1_data) * 2 > EPOCHS_PER_ETH1_VOTING_PERIOD * SLOTS_PER_EPOCH:
// state.latest_eth1_data = body.eth1_data
func ProcessEth1DataInBlock(_ context.Context, beaconState *stateTrie.BeaconState, b *ethpb.SignedBeaconBlock) (*stateTrie.BeaconState, error) {
block := b.Block
if beaconState == nil {
return nil, errors.New("nil state")
}
if block == nil || block.Body == nil {
return nil, errors.New("nil block or block withought body")
}
if err := beaconState.AppendEth1DataVotes(block.Body.Eth1Data); err != nil {
return nil, err
}
hasSupport, err := Eth1DataHasEnoughSupport(beaconState, block.Body.Eth1Data)
if err != nil {
return nil, err
}
if hasSupport {
if err := beaconState.SetEth1Data(block.Body.Eth1Data); err != nil {
return nil, err
}
}
return beaconState, nil
}
// AreEth1DataEqual checks equality between two eth1 data objects.
func AreEth1DataEqual(a, b *ethpb.Eth1Data) bool {
if a == nil && b == nil {
return true
}
if a == nil || b == nil {
return false
}
return a.DepositCount == b.DepositCount &&
bytes.Equal(a.BlockHash, b.BlockHash) &&
bytes.Equal(a.DepositRoot, b.DepositRoot)
}
// Eth1DataHasEnoughSupport returns true when the given eth1data has more than 50% votes in the
// eth1 voting period. A vote is cast by including eth1data in a block and part of state processing
// appends eth1data to the state in the Eth1DataVotes list. Iterating through this list checks the
// votes to see if they match the eth1data.
func Eth1DataHasEnoughSupport(beaconState *stateTrie.BeaconState, data *ethpb.Eth1Data) (bool, error) {
voteCount := uint64(0)
data = stateTrie.CopyETH1Data(data)
for _, vote := range beaconState.Eth1DataVotes() {
if AreEth1DataEqual(vote, data) {
voteCount++
}
}
// If 50+% majority converged on the same eth1data, then it has enough support to update the
// state.
support := params.BeaconConfig().EpochsPerEth1VotingPeriod.Mul(params.BeaconConfig().SlotsPerEpoch)
return voteCount*2 > uint64(support), nil
}