doublylinkedtree

package
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 Go to latest Published: Aug 22, 2022 License: GPL-3.0 Imports: 24 Imported by: 3

Documentation

Overview

Package doublylinkedtree implements eth2 LMD GHOST fork choice using the doubly linked proto array node structure.

Index

Constants

This section is empty.

Variables

View Source 
var ErrNilNode = errors.New("invalid nil or unknown node")

Functions

This section is empty.

Types

type ForkChoice 

type ForkChoice struct {
	// contains filtered or unexported fields
}

ForkChoice defines the overall fork choice store which includes all block nodes, validator's latest votes and balances.

func New 

func New() *ForkChoice

New initializes a new fork choice store.

func (*ForkChoice) AllTipsAreInvalid 

func (f *ForkChoice) AllTipsAreInvalid() bool

AllTipsAreInvalid returns true if no forkchoice tip is viable for head

func (*ForkChoice) AncestorRoot 

func (f *ForkChoice) AncestorRoot(ctx context.Context, root [32]byte, slot types.Slot) ([32]byte, error)

AncestorRoot returns the ancestor root of input block root at a given slot.

func (*ForkChoice) BestJustifiedCheckpoint 

func (f *ForkChoice) BestJustifiedCheckpoint() *forkchoicetypes.Checkpoint

BestJustifiedCheckpoint of fork choice store.

func (*ForkChoice) CachedHeadRoot 

func (f *ForkChoice) CachedHeadRoot() [32]byte

CachedHeadRoot returns the last cached head root

func (*ForkChoice) CommonAncestorRoot 

func (f *ForkChoice) CommonAncestorRoot(ctx context.Context, r1 [32]byte, r2 [32]byte) ([32]byte, error)

CommonAncestorRoot returns the common ancestor root between the two block roots r1 and r2.

func (*ForkChoice) FinalizedCheckpoint 

func (f *ForkChoice) FinalizedCheckpoint() *forkchoicetypes.Checkpoint

FinalizedCheckpoint of fork choice store.

func (*ForkChoice) FinalizedPayloadBlockHash 

func (f *ForkChoice) FinalizedPayloadBlockHash() [32]byte

FinalizedPayloadBlockHash returns the hash of the payload at the finalized checkpoint

func (*ForkChoice) HasNode 

func (f *ForkChoice) HasNode(root [32]byte) bool

HasNode returns true if the node exists in fork choice store, false else wise.

func (*ForkChoice) HasParent 

func (f *ForkChoice) HasParent(root [32]byte) bool

HasParent returns true if the node parent exists in fork choice store, false else wise.

func (*ForkChoice) Head 

func (f *ForkChoice) Head(
	ctx context.Context,
	justifiedStateBalances []uint64,
) ([32]byte, error)

Head returns the head root from fork choice store. It firsts computes validator's balance changes then recalculates block tree from leaves to root.

func (*ForkChoice) HighestReceivedBlockSlot 

func (f *ForkChoice) HighestReceivedBlockSlot() types.Slot

HighestReceivedBlockSlot returns the highest slot received by the forkchoice

func (*ForkChoice) InsertNode 

func (f *ForkChoice) InsertNode(ctx context.Context, state state.BeaconState, root [32]byte) error

InsertNode processes a new block by inserting it to the fork choice store.

func (*ForkChoice) InsertOptimisticChain 

func (f *ForkChoice) InsertOptimisticChain(ctx context.Context, chain []*forkchoicetypes.BlockAndCheckpoints) error

InsertOptimisticChain inserts all nodes corresponding to blocks in the slice `blocks`. This slice must be ordered from child to parent. It includes all 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 (*ForkChoice) InsertSlashedIndex 

func (f *ForkChoice) InsertSlashedIndex(_ context.Context, index types.ValidatorIndex)

InsertSlashedIndex adds the given slashed validator index to the store-tracked list. Votes from these validators are not accounted for in forkchoice.

func (*ForkChoice) IsCanonical 

func (f *ForkChoice) IsCanonical(root [32]byte) bool

IsCanonical returns true if the given root is part of the canonical chain.

func (*ForkChoice) IsOptimistic 

func (f *ForkChoice) IsOptimistic(root [32]byte) (bool, error)

IsOptimistic returns true if the given root has been optimistically synced.

func (*ForkChoice) JustifiedCheckpoint 

func (f *ForkChoice) JustifiedCheckpoint() *forkchoicetypes.Checkpoint

JustifiedCheckpoint of fork choice store.

func (*ForkChoice) JustifiedPayloadBlockHash 

func (f *ForkChoice) JustifiedPayloadBlockHash() [32]byte

JustifiedPayloadBlockHash returns the hash of the payload at the justified checkpoint

func (*ForkChoice) NewSlot 

func (f *ForkChoice) NewSlot(ctx context.Context, slot types.Slot) error

NewSlot mimics the implementation of `on_tick` in fork choice consensus spec. It resets the proposer boost root in fork choice, and it updates store's justified checkpoint if a better checkpoint on the store's finalized checkpoint chain. This should only be called at the start of every slot interval.

Spec pseudocode definition: 

# Reset store.proposer_boost_root if this is a new slot
if current_slot > previous_slot:
    store.proposer_boost_root = Root()

# Not a new epoch, return
if not (current_slot > previous_slot and compute_slots_since_epoch_start(current_slot) == 0):
    return

# Update store.justified_checkpoint if a better checkpoint on the store.finalized_checkpoint chain
if store.best_justified_checkpoint.epoch > store.justified_checkpoint.epoch:
    finalized_slot = compute_start_slot_at_epoch(store.finalized_checkpoint.epoch)
    ancestor_at_finalized_slot = get_ancestor(store, store.best_justified_checkpoint.root, finalized_slot)
    if ancestor_at_finalized_slot == store.finalized_checkpoint.root:
        store.justified_checkpoint = store.best_justified_checkpoint

func (*ForkChoice) NodeCount 

func (f *ForkChoice) NodeCount() int

NodeCount returns the current number of nodes in the Store.

func (*ForkChoice) PreviousJustifiedCheckpoint 

func (f *ForkChoice) PreviousJustifiedCheckpoint() *forkchoicetypes.Checkpoint

PreviousJustifiedCheckpoint of fork choice store.

func (*ForkChoice) ProcessAttestation 

func (f *ForkChoice) ProcessAttestation(ctx context.Context, validatorIndices []uint64, blockRoot [32]byte, targetEpoch types.Epoch)

ProcessAttestation processes attestation for vote accounting, it iterates around validator indices and update their votes accordingly.

func (*ForkChoice) ProposerBoost 

func (f *ForkChoice) ProposerBoost() [fieldparams.RootLength]byte

ProposerBoost returns the proposerBoost of the store

func (*ForkChoice) ReceivedBlocksLastEpoch 

func (f *ForkChoice) ReceivedBlocksLastEpoch() (uint64, error)

ReceivedBlocksLastEpoch returns the number of blocks received in the last epoch

func (*ForkChoice) ResetBoostedProposerRoot 

func (f *ForkChoice) ResetBoostedProposerRoot(_ context.Context) error

ResetBoostedProposerRoot sets the value of the proposer boosted root to zeros.

func (*ForkChoice) SetGenesisTime 

func (f *ForkChoice) SetGenesisTime(genesisTime uint64)

SetGenesisTime sets the genesisTime tracked by forkchoice

func (*ForkChoice) SetOptimisticToInvalid 

func (f *ForkChoice) SetOptimisticToInvalid(ctx context.Context, root, parentRoot, payloadHash [fieldparams.RootLength]byte) ([][32]byte, error)

SetOptimisticToInvalid removes a block with an invalid execution payload from fork choice store

func (*ForkChoice) SetOptimisticToValid 

func (f *ForkChoice) SetOptimisticToValid(ctx context.Context, root [fieldparams.RootLength]byte) error

SetOptimisticToValid sets the node with the given root as a fully validated node

func (*ForkChoice) SetOriginRoot 

func (f *ForkChoice) SetOriginRoot(root [32]byte)

SetOriginRoot sets the genesis block root

func (*ForkChoice) Tips 

func (f *ForkChoice) Tips() ([][32]byte, []types.Slot)

Tips returns a list of possible heads from fork choice store, it returns the roots and the slots of the leaf nodes.

func (*ForkChoice) UpdateFinalizedCheckpoint 

func (f *ForkChoice) UpdateFinalizedCheckpoint(fc *forkchoicetypes.Checkpoint) error

UpdateFinalizedCheckpoint sets the finalized checkpoint to the given one

func (*ForkChoice) UpdateJustifiedCheckpoint 

func (f *ForkChoice) UpdateJustifiedCheckpoint(jc *forkchoicetypes.Checkpoint) error

UpdateJustifiedCheckpoint sets the justified checkpoint to the given one

type Node 

type Node struct {
	// contains filtered or unexported fields
}

Node defines the individual block which includes its block parent, ancestor and how much weight accounted for it. This is used as an array based stateful DAG for efficient fork choice look up.

type Store 

type Store struct {
	// contains filtered or unexported fields
}

Store defines the fork choice store which includes block nodes and the last view of checkpoint information.

func (*Store) PruneThreshold 

func (s *Store) PruneThreshold() uint64

PruneThreshold of fork choice store.

type Vote 

type Vote struct {
	// contains filtered or unexported fields
}

Vote defines an individual validator's vote.

Source Files

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