mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2024-12-25 12:57:18 +00:00
640 lines
20 KiB
Go
640 lines
20 KiB
Go
package doublylinkedtree
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import (
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"context"
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"fmt"
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"time"
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"github.com/pkg/errors"
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"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/blocks"
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"github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice"
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forkchoicetypes "github.com/prysmaticlabs/prysm/v4/beacon-chain/forkchoice/types"
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"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
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fieldparams "github.com/prysmaticlabs/prysm/v4/config/fieldparams"
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"github.com/prysmaticlabs/prysm/v4/config/params"
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"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
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"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
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v1 "github.com/prysmaticlabs/prysm/v4/proto/eth/v1"
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ethpb "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
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"github.com/prysmaticlabs/prysm/v4/runtime/version"
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"github.com/prysmaticlabs/prysm/v4/time/slots"
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"github.com/sirupsen/logrus"
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"go.opencensus.io/trace"
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)
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// New initializes a new fork choice store.
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func New() *ForkChoice {
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s := &Store{
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justifiedCheckpoint: &forkchoicetypes.Checkpoint{},
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unrealizedJustifiedCheckpoint: &forkchoicetypes.Checkpoint{},
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unrealizedFinalizedCheckpoint: &forkchoicetypes.Checkpoint{},
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prevJustifiedCheckpoint: &forkchoicetypes.Checkpoint{},
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finalizedCheckpoint: &forkchoicetypes.Checkpoint{},
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proposerBoostRoot: [32]byte{},
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nodeByRoot: make(map[[fieldparams.RootLength]byte]*Node),
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nodeByPayload: make(map[[fieldparams.RootLength]byte]*Node),
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slashedIndices: make(map[primitives.ValidatorIndex]bool),
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receivedBlocksLastEpoch: [fieldparams.SlotsPerEpoch]primitives.Slot{},
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}
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b := make([]uint64, 0)
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v := make([]Vote, 0)
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return &ForkChoice{store: s, balances: b, votes: v}
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}
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// NodeCount returns the current number of nodes in the Store.
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func (f *ForkChoice) NodeCount() int {
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return len(f.store.nodeByRoot)
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}
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// Head returns the head root from fork choice store.
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// It firsts computes validator's balance changes then recalculates block tree from leaves to root.
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func (f *ForkChoice) Head(
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ctx context.Context,
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) ([32]byte, error) {
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ctx, span := trace.StartSpan(ctx, "doublyLinkedForkchoice.Head")
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defer span.End()
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calledHeadCount.Inc()
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if err := f.updateBalances(); err != nil {
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return [32]byte{}, errors.Wrap(err, "could not update balances")
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}
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if err := f.applyProposerBoostScore(); err != nil {
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return [32]byte{}, errors.Wrap(err, "could not apply proposer boost score")
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}
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if err := f.store.treeRootNode.applyWeightChanges(ctx); err != nil {
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return [32]byte{}, errors.Wrap(err, "could not apply weight changes")
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}
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jc := f.JustifiedCheckpoint()
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fc := f.FinalizedCheckpoint()
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currentEpoch := slots.EpochsSinceGenesis(time.Unix(int64(f.store.genesisTime), 0))
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if err := f.store.treeRootNode.updateBestDescendant(ctx, jc.Epoch, fc.Epoch, currentEpoch); err != nil {
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return [32]byte{}, errors.Wrap(err, "could not update best descendant")
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}
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return f.store.head(ctx)
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}
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// ProcessAttestation processes attestation for vote accounting, it iterates around validator indices
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// and update their votes accordingly.
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func (f *ForkChoice) ProcessAttestation(ctx context.Context, validatorIndices []uint64, blockRoot [32]byte, targetEpoch primitives.Epoch) {
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_, span := trace.StartSpan(ctx, "doublyLinkedForkchoice.ProcessAttestation")
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defer span.End()
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for _, index := range validatorIndices {
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// Validator indices will grow the vote cache.
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for index >= uint64(len(f.votes)) {
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f.votes = append(f.votes, Vote{currentRoot: params.BeaconConfig().ZeroHash, nextRoot: params.BeaconConfig().ZeroHash})
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}
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// Newly allocated vote if the root fields are untouched.
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newVote := f.votes[index].nextRoot == params.BeaconConfig().ZeroHash &&
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f.votes[index].currentRoot == params.BeaconConfig().ZeroHash
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// Vote gets updated if it's newly allocated or high target epoch.
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if newVote || targetEpoch > f.votes[index].nextEpoch {
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f.votes[index].nextEpoch = targetEpoch
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f.votes[index].nextRoot = blockRoot
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}
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}
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processedAttestationCount.Inc()
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}
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// InsertNode processes a new block by inserting it to the fork choice store.
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func (f *ForkChoice) InsertNode(ctx context.Context, state state.BeaconState, root [32]byte) error {
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ctx, span := trace.StartSpan(ctx, "doublyLinkedForkchoice.InsertNode")
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defer span.End()
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slot := state.Slot()
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bh := state.LatestBlockHeader()
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if bh == nil {
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return errNilBlockHeader
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}
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parentRoot := bytesutil.ToBytes32(bh.ParentRoot)
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var payloadHash [32]byte
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if state.Version() >= version.Bellatrix {
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ph, err := state.LatestExecutionPayloadHeader()
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if err != nil {
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return err
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}
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if ph != nil {
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copy(payloadHash[:], ph.BlockHash())
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}
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}
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jc := state.CurrentJustifiedCheckpoint()
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if jc == nil {
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return errInvalidNilCheckpoint
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}
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justifiedEpoch := jc.Epoch
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fc := state.FinalizedCheckpoint()
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if fc == nil {
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return errInvalidNilCheckpoint
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}
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finalizedEpoch := fc.Epoch
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node, err := f.store.insert(ctx, slot, root, parentRoot, payloadHash, justifiedEpoch, finalizedEpoch)
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if err != nil {
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return err
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}
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jc, fc = f.store.pullTips(state, node, jc, fc)
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return f.updateCheckpoints(ctx, jc, fc)
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}
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// updateCheckpoints update the checkpoints when inserting a new node.
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func (f *ForkChoice) updateCheckpoints(ctx context.Context, jc, fc *ethpb.Checkpoint) error {
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if jc.Epoch > f.store.justifiedCheckpoint.Epoch {
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f.store.prevJustifiedCheckpoint = f.store.justifiedCheckpoint
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jcRoot := bytesutil.ToBytes32(jc.Root)
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f.store.justifiedCheckpoint = &forkchoicetypes.Checkpoint{Epoch: jc.Epoch, Root: jcRoot}
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if err := f.updateJustifiedBalances(ctx, jcRoot); err != nil {
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return errors.Wrap(err, "could not update justified balances")
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}
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}
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// Update finalization
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if fc.Epoch <= f.store.finalizedCheckpoint.Epoch {
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return nil
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}
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f.store.finalizedCheckpoint = &forkchoicetypes.Checkpoint{Epoch: fc.Epoch,
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Root: bytesutil.ToBytes32(fc.Root)}
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return f.store.prune(ctx)
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}
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// HasNode returns true if the node exists in fork choice store,
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// false else wise.
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func (f *ForkChoice) HasNode(root [32]byte) bool {
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_, ok := f.store.nodeByRoot[root]
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return ok
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}
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// IsCanonical returns true if the given root is part of the canonical chain.
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func (f *ForkChoice) IsCanonical(root [32]byte) bool {
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node, ok := f.store.nodeByRoot[root]
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if !ok || node == nil {
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return false
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}
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if node.bestDescendant == nil {
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if f.store.headNode.bestDescendant == nil {
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return node == f.store.headNode
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}
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return node == f.store.headNode.bestDescendant
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}
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if f.store.headNode.bestDescendant == nil {
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return node.bestDescendant == f.store.headNode
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}
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return node.bestDescendant == f.store.headNode.bestDescendant
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}
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// IsOptimistic returns true if the given root has been optimistically synced.
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func (f *ForkChoice) IsOptimistic(root [32]byte) (bool, error) {
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if f.store.allTipsAreInvalid {
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return true, nil
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}
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node, ok := f.store.nodeByRoot[root]
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if !ok || node == nil {
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return true, ErrNilNode
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}
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return node.optimistic, nil
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}
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// AncestorRoot returns the ancestor root of input block root at a given slot.
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func (f *ForkChoice) AncestorRoot(ctx context.Context, root [32]byte, slot primitives.Slot) ([32]byte, error) {
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ctx, span := trace.StartSpan(ctx, "doublyLinkedForkchoice.AncestorRoot")
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defer span.End()
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node, ok := f.store.nodeByRoot[root]
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if !ok || node == nil {
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return [32]byte{}, errors.Wrap(ErrNilNode, "could not determine ancestor root")
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}
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n := node
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for n != nil && n.slot > slot {
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if ctx.Err() != nil {
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return [32]byte{}, ctx.Err()
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}
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n = n.parent
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}
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if n == nil {
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return [32]byte{}, errors.Wrap(ErrNilNode, "could not determine ancestor root")
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}
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return n.root, nil
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}
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// IsViableForCheckpoint returns whether the root passed is a checkpoint root for any
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// known chain in forkchoice.
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func (f *ForkChoice) IsViableForCheckpoint(cp *forkchoicetypes.Checkpoint) (bool, error) {
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node, ok := f.store.nodeByRoot[cp.Root]
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if !ok || node == nil {
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return false, nil
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}
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epochStart, err := slots.EpochStart(cp.Epoch)
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if err != nil {
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return false, err
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}
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if node.slot > epochStart {
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return false, nil
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}
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if len(node.children) == 0 {
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return true, nil
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}
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if node.slot == epochStart {
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return true, nil
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}
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nodeEpoch := slots.ToEpoch(node.slot)
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if nodeEpoch >= cp.Epoch {
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return false, nil
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}
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for _, child := range node.children {
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if child.slot > epochStart {
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return true, nil
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}
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}
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return false, nil
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}
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// updateBalances updates the balances that directly voted for each block taking into account the
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// validators' latest votes.
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func (f *ForkChoice) updateBalances() error {
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newBalances := f.justifiedBalances
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zHash := params.BeaconConfig().ZeroHash
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for index, vote := range f.votes {
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// Skip if validator has been slashed
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if f.store.slashedIndices[primitives.ValidatorIndex(index)] {
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continue
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}
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// Skip if validator has never voted for current root and next root (i.e. if the
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// votes are zero hash aka genesis block), there's nothing to compute.
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if vote.currentRoot == zHash && vote.nextRoot == zHash {
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continue
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}
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oldBalance := uint64(0)
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newBalance := uint64(0)
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// If the validator index did not exist in `f.balances` or
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// `newBalances` list above, the balance is just 0.
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if index < len(f.balances) {
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oldBalance = f.balances[index]
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}
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if index < len(newBalances) {
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newBalance = newBalances[index]
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}
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// Update only if the validator's balance or vote has changed.
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if vote.currentRoot != vote.nextRoot || oldBalance != newBalance {
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// Ignore the vote if the root is not in fork choice
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// store, that means we have not seen the block before.
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nextNode, ok := f.store.nodeByRoot[vote.nextRoot]
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if ok && vote.nextRoot != zHash {
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// Protection against nil node
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if nextNode == nil {
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return errors.Wrap(ErrNilNode, "could not update balances")
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}
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nextNode.balance += newBalance
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}
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currentNode, ok := f.store.nodeByRoot[vote.currentRoot]
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if ok && vote.currentRoot != zHash {
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// Protection against nil node
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if currentNode == nil {
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return errors.Wrap(ErrNilNode, "could not update balances")
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}
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if currentNode.balance < oldBalance {
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log.WithFields(logrus.Fields{
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"nodeRoot": fmt.Sprintf("%#x", bytesutil.Trunc(vote.currentRoot[:])),
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"oldBalance": oldBalance,
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"nodeBalance": currentNode.balance,
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"nodeWeight": currentNode.weight,
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"proposerBoostRoot": fmt.Sprintf("%#x", bytesutil.Trunc(f.store.proposerBoostRoot[:])),
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"previousProposerBoostRoot": fmt.Sprintf("%#x", bytesutil.Trunc(f.store.previousProposerBoostRoot[:])),
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"previousProposerBoostScore": f.store.previousProposerBoostScore,
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}).Warning("node with invalid balance, setting it to zero")
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currentNode.balance = 0
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} else {
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currentNode.balance -= oldBalance
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}
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}
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}
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// Rotate the validator vote.
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f.votes[index].currentRoot = vote.nextRoot
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}
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f.balances = newBalances
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return nil
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}
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// Tips returns a list of possible heads from fork choice store, it returns the
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// roots and the slots of the leaf nodes.
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func (f *ForkChoice) Tips() ([][32]byte, []primitives.Slot) {
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return f.store.tips()
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}
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// ProposerBoost returns the proposerBoost of the store
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func (f *ForkChoice) ProposerBoost() [fieldparams.RootLength]byte {
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return f.store.proposerBoost()
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}
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// SetOptimisticToValid sets the node with the given root as a fully validated node
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func (f *ForkChoice) SetOptimisticToValid(ctx context.Context, root [fieldparams.RootLength]byte) error {
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node, ok := f.store.nodeByRoot[root]
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if !ok || node == nil {
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return errors.Wrap(ErrNilNode, "could not set node to valid")
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}
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return node.setNodeAndParentValidated(ctx)
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}
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// PreviousJustifiedCheckpoint of fork choice store.
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func (f *ForkChoice) PreviousJustifiedCheckpoint() *forkchoicetypes.Checkpoint {
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return f.store.prevJustifiedCheckpoint
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}
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// JustifiedCheckpoint of fork choice store.
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func (f *ForkChoice) JustifiedCheckpoint() *forkchoicetypes.Checkpoint {
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return f.store.justifiedCheckpoint
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}
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// FinalizedCheckpoint of fork choice store.
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func (f *ForkChoice) FinalizedCheckpoint() *forkchoicetypes.Checkpoint {
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return f.store.finalizedCheckpoint
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}
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// SetOptimisticToInvalid removes a block with an invalid execution payload from fork choice store
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func (f *ForkChoice) SetOptimisticToInvalid(ctx context.Context, root, parentRoot, payloadHash [fieldparams.RootLength]byte) ([][32]byte, error) {
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return f.store.setOptimisticToInvalid(ctx, root, parentRoot, payloadHash)
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}
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// InsertSlashedIndex adds the given slashed validator index to the
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// store-tracked list. Votes from these validators are not accounted for
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// in forkchoice.
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func (f *ForkChoice) InsertSlashedIndex(_ context.Context, index primitives.ValidatorIndex) {
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// return early if the index was already included:
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if f.store.slashedIndices[index] {
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return
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}
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f.store.slashedIndices[index] = true
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// Subtract last vote from this equivocating validator
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if index >= primitives.ValidatorIndex(len(f.balances)) {
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return
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}
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if index >= primitives.ValidatorIndex(len(f.votes)) {
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return
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}
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node, ok := f.store.nodeByRoot[f.votes[index].currentRoot]
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if !ok || node == nil {
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return
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}
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if node.balance < f.balances[index] {
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node.balance = 0
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} else {
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node.balance -= f.balances[index]
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}
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}
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// UpdateJustifiedCheckpoint sets the justified checkpoint to the given one
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func (f *ForkChoice) UpdateJustifiedCheckpoint(ctx context.Context, jc *forkchoicetypes.Checkpoint) error {
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if jc == nil {
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return errInvalidNilCheckpoint
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}
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f.store.prevJustifiedCheckpoint = f.store.justifiedCheckpoint
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f.store.justifiedCheckpoint = jc
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if err := f.updateJustifiedBalances(ctx, jc.Root); err != nil {
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return errors.Wrap(err, "could not update justified balances")
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}
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return nil
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}
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// UpdateFinalizedCheckpoint sets the finalized checkpoint to the given one
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func (f *ForkChoice) UpdateFinalizedCheckpoint(fc *forkchoicetypes.Checkpoint) error {
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if fc == nil {
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return errInvalidNilCheckpoint
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}
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f.store.finalizedCheckpoint = fc
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return nil
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}
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// CommonAncestor returns the common ancestor root and slot between the two block roots r1 and r2.
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func (f *ForkChoice) CommonAncestor(ctx context.Context, r1 [32]byte, r2 [32]byte) ([32]byte, primitives.Slot, error) {
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ctx, span := trace.StartSpan(ctx, "doublyLinkedForkchoice.CommonAncestorRoot")
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defer span.End()
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n1, ok := f.store.nodeByRoot[r1]
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if !ok || n1 == nil {
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return [32]byte{}, 0, forkchoice.ErrUnknownCommonAncestor
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}
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// Do nothing if the input roots are the same.
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if r1 == r2 {
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return r1, n1.slot, nil
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}
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n2, ok := f.store.nodeByRoot[r2]
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if !ok || n2 == nil {
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return [32]byte{}, 0, forkchoice.ErrUnknownCommonAncestor
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}
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for {
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if ctx.Err() != nil {
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return [32]byte{}, 0, ctx.Err()
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}
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if n1.slot > n2.slot {
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n1 = n1.parent
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// Reaches the end of the tree and unable to find common ancestor.
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// This should not happen at runtime as the finalized
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// node has to be a common ancestor
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if n1 == nil {
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return [32]byte{}, 0, forkchoice.ErrUnknownCommonAncestor
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}
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} else {
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n2 = n2.parent
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// Reaches the end of the tree and unable to find common ancestor.
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if n2 == nil {
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return [32]byte{}, 0, forkchoice.ErrUnknownCommonAncestor
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}
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}
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if n1 == n2 {
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return n1.root, n1.slot, nil
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}
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}
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}
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// InsertChain inserts all nodes corresponding to blocks in the slice
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// `blocks`. This slice must be ordered from child to parent. It includes all
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// blocks **except** the first one (that is the one with the highest slot
|
|
// number). All blocks are assumed to be a strict chain
|
|
// where blocks[i].Parent = blocks[i+1]. Also we assume that the parent of the
|
|
// last block in this list is already included in forkchoice store.
|
|
func (f *ForkChoice) InsertChain(ctx context.Context, chain []*forkchoicetypes.BlockAndCheckpoints) error {
|
|
if len(chain) == 0 {
|
|
return nil
|
|
}
|
|
for i := len(chain) - 1; i > 0; i-- {
|
|
b := chain[i].Block
|
|
r := chain[i-1].Block.ParentRoot()
|
|
parentRoot := b.ParentRoot()
|
|
payloadHash, err := blocks.GetBlockPayloadHash(b)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if _, err := f.store.insert(ctx,
|
|
b.Slot(), r, parentRoot, payloadHash,
|
|
chain[i].JustifiedCheckpoint.Epoch, chain[i].FinalizedCheckpoint.Epoch); err != nil {
|
|
return err
|
|
}
|
|
if err := f.updateCheckpoints(ctx, chain[i].JustifiedCheckpoint, chain[i].FinalizedCheckpoint); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// SetGenesisTime sets the genesisTime tracked by forkchoice
|
|
func (f *ForkChoice) SetGenesisTime(genesisTime uint64) {
|
|
f.store.genesisTime = genesisTime
|
|
}
|
|
|
|
// SetOriginRoot sets the genesis block root
|
|
func (f *ForkChoice) SetOriginRoot(root [32]byte) {
|
|
f.store.originRoot = root
|
|
}
|
|
|
|
// CachedHeadRoot returns the last cached head root
|
|
func (f *ForkChoice) CachedHeadRoot() [32]byte {
|
|
node := f.store.headNode
|
|
if node == nil {
|
|
return [32]byte{}
|
|
}
|
|
return f.store.headNode.root
|
|
}
|
|
|
|
// FinalizedPayloadBlockHash returns the hash of the payload at the finalized checkpoint
|
|
func (f *ForkChoice) FinalizedPayloadBlockHash() [32]byte {
|
|
root := f.FinalizedCheckpoint().Root
|
|
node, ok := f.store.nodeByRoot[root]
|
|
if !ok || node == nil {
|
|
// This should not happen
|
|
return [32]byte{}
|
|
}
|
|
return node.payloadHash
|
|
}
|
|
|
|
// JustifiedPayloadBlockHash returns the hash of the payload at the justified checkpoint
|
|
func (f *ForkChoice) JustifiedPayloadBlockHash() [32]byte {
|
|
root := f.JustifiedCheckpoint().Root
|
|
node, ok := f.store.nodeByRoot[root]
|
|
if !ok || node == nil {
|
|
// This should not happen
|
|
return [32]byte{}
|
|
}
|
|
return node.payloadHash
|
|
}
|
|
|
|
// UnrealizedJustifiedPayloadBlockHash returns the hash of the payload at the unrealized justified checkpoint
|
|
func (f *ForkChoice) UnrealizedJustifiedPayloadBlockHash() [32]byte {
|
|
root := f.store.unrealizedJustifiedCheckpoint.Root
|
|
node, ok := f.store.nodeByRoot[root]
|
|
if !ok || node == nil {
|
|
// This should not happen
|
|
return [32]byte{}
|
|
}
|
|
return node.payloadHash
|
|
}
|
|
|
|
// ForkChoiceDump returns a full dump of forkchoice.
|
|
func (f *ForkChoice) ForkChoiceDump(ctx context.Context) (*v1.ForkChoiceDump, error) {
|
|
jc := &v1.Checkpoint{
|
|
Epoch: f.store.justifiedCheckpoint.Epoch,
|
|
Root: f.store.justifiedCheckpoint.Root[:],
|
|
}
|
|
ujc := &v1.Checkpoint{
|
|
Epoch: f.store.unrealizedJustifiedCheckpoint.Epoch,
|
|
Root: f.store.unrealizedJustifiedCheckpoint.Root[:],
|
|
}
|
|
fc := &v1.Checkpoint{
|
|
Epoch: f.store.finalizedCheckpoint.Epoch,
|
|
Root: f.store.finalizedCheckpoint.Root[:],
|
|
}
|
|
ufc := &v1.Checkpoint{
|
|
Epoch: f.store.unrealizedFinalizedCheckpoint.Epoch,
|
|
Root: f.store.unrealizedFinalizedCheckpoint.Root[:],
|
|
}
|
|
nodes := make([]*v1.ForkChoiceNode, 0, f.NodeCount())
|
|
var err error
|
|
if f.store.treeRootNode != nil {
|
|
nodes, err = f.store.treeRootNode.nodeTreeDump(ctx, nodes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
var headRoot [32]byte
|
|
if f.store.headNode != nil {
|
|
headRoot = f.store.headNode.root
|
|
}
|
|
resp := &v1.ForkChoiceDump{
|
|
JustifiedCheckpoint: jc,
|
|
UnrealizedJustifiedCheckpoint: ujc,
|
|
FinalizedCheckpoint: fc,
|
|
UnrealizedFinalizedCheckpoint: ufc,
|
|
ProposerBoostRoot: f.store.proposerBoostRoot[:],
|
|
PreviousProposerBoostRoot: f.store.previousProposerBoostRoot[:],
|
|
HeadRoot: headRoot[:],
|
|
ForkChoiceNodes: nodes,
|
|
}
|
|
return resp, nil
|
|
}
|
|
|
|
// SetBalancesByRooter sets the balanceByRoot handler in forkchoice
|
|
func (f *ForkChoice) SetBalancesByRooter(handler forkchoice.BalancesByRooter) {
|
|
f.balancesByRoot = handler
|
|
}
|
|
|
|
// Weight returns the weight of the given root if found on the store
|
|
func (f *ForkChoice) Weight(root [32]byte) (uint64, error) {
|
|
n, ok := f.store.nodeByRoot[root]
|
|
if !ok || n == nil {
|
|
return 0, ErrNilNode
|
|
}
|
|
return n.weight, nil
|
|
}
|
|
|
|
// updateJustifiedBalances updates the validators balances on the justified checkpoint pointed by root.
|
|
func (f *ForkChoice) updateJustifiedBalances(ctx context.Context, root [32]byte) error {
|
|
balances, err := f.balancesByRoot(ctx, root)
|
|
if err != nil {
|
|
return errors.Wrap(err, "could not get justified balances")
|
|
}
|
|
f.justifiedBalances = balances
|
|
f.store.committeeWeight = 0
|
|
f.numActiveValidators = 0
|
|
for _, val := range balances {
|
|
if val > 0 {
|
|
f.store.committeeWeight += val
|
|
f.numActiveValidators++
|
|
}
|
|
}
|
|
f.store.committeeWeight /= uint64(params.BeaconConfig().SlotsPerEpoch)
|
|
return nil
|
|
}
|
|
|
|
// Slot returns the slot of the given root if it's known to forkchoice
|
|
func (f *ForkChoice) Slot(root [32]byte) (primitives.Slot, error) {
|
|
n, ok := f.store.nodeByRoot[root]
|
|
if !ok || n == nil {
|
|
return 0, ErrNilNode
|
|
}
|
|
return n.slot, nil
|
|
}
|