155 lines
4.3 KiB
Nim
155 lines
4.3 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2022 Status Research & Development GmbH
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.push raises: [Defect].}
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import
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# Standard library
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std/[options, tables],
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# Status
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stew/results,
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chronicles,
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# Internal
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../spec/datatypes/base
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# https://github.com/ethereum/consensus-specs/blob/v0.11.1/specs/phase0/fork-choice.md
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# This is a port of https://github.com/sigp/lighthouse/pull/804
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# which is a port of "Proto-Array": https://github.com/protolambda/lmd-ghost
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# See also:
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# - Protolambda port of Lighthouse: https://github.com/protolambda/eth2-py-hacks/blob/ae286567/proto_array.py
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# - Prysmatic writeup: https://hackmd.io/bABJiht3Q9SyV3Ga4FT9lQ#High-level-concept
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# - Gasper Whitepaper: https://arxiv.org/abs/2003.03052
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# ProtoArray low-level types
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# ----------------------------------------------------------------------
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type
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fcKind* = enum
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## Fork Choice Error Kinds
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fcFinalizedNodeUnknown
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fcJustifiedNodeUnknown
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fcInvalidNodeIndex
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fcInvalidJustifiedIndex
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fcInvalidBestDescendant
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fcInvalidParentDelta
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fcInvalidNodeDelta
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fcDeltaUnderflow
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fcDeltaOverflow
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fcInvalidDeltaLen
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fcInvalidBestNode
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fcInconsistentTick
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fcUnknownParent
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fcPruningFromOutdatedFinalizedRoot
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fcInvalidEpochRef
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Index* = int
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Delta* = int64
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## Delta balances
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ForkChoiceError* = object
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case kind*: fcKind
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of fcFinalizedNodeUnknown,
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fcJustifiedNodeUnknown:
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blockRoot*: Eth2Digest
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of fcInconsistentTick, fcInvalidEpochRef:
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discard
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of fcInvalidNodeIndex,
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fcInvalidJustifiedIndex,
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fcInvalidBestDescendant,
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fcInvalidParentDelta,
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fcInvalidNodeDelta,
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fcDeltaUnderflow,
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fcDeltaOverflow:
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index*: Index
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of fcInvalidDeltaLen:
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deltasLen*: int
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indicesLen*: int
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of fcInvalidBestNode:
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startRoot*: Eth2Digest
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fkChoiceJustifiedCheckpoint*: Checkpoint
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fkChoiceFinalizedCheckpoint*: Checkpoint
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headRoot*: Eth2Digest
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headJustifiedCheckpoint*: Checkpoint
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headFinalizedCheckpoint*: Checkpoint
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of fcUnknownParent:
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childRoot*: Eth2Digest
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parentRoot*: Eth2Digest
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of fcPruningFromOutdatedFinalizedRoot:
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finalizedRoot*: Eth2Digest
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FcResult*[T] = Result[T, ForkChoiceError]
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ProtoNodes* = object
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buf*: seq[ProtoNode]
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offset*: int ##\
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## Substracted from logical Index
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## to get the physical index
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ProtoArray* = object
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justifiedCheckpoint*: Checkpoint
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finalizedCheckpoint*: Checkpoint
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nodes*: ProtoNodes
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indices*: Table[Eth2Digest, Index]
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previousProposerBoostRoot*: Eth2Digest
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previousProposerBoostScore*: int64
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ProtoNode* = object
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root*: Eth2Digest
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parent*: Option[Index]
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justifiedCheckpoint*: Checkpoint
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finalizedCheckpoint*: Checkpoint
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weight*: int64
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bestChild*: Option[Index]
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bestDescendant*: Option[Index]
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BalanceCheckpoint* = object
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checkpoint*: Checkpoint
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balances*: seq[Gwei]
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Checkpoints* = object
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time*: BeaconTime
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justified*: BalanceCheckpoint
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finalized*: Checkpoint
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best_justified*: Checkpoint
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proposer_boost_root*: Eth2Digest
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# Fork choice high-level types
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# ----------------------------------------------------------------------
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type
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VoteTracker* = object
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current_root*: Eth2Digest
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next_root*: Eth2Digest
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next_epoch*: Epoch
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ForkChoiceBackend* = object
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proto_array*: ProtoArray
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votes*: seq[VoteTracker]
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balances*: seq[Gwei]
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proposer_boosting*: bool
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QueuedAttestation* = object
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slot*: Slot
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attesting_indices*: seq[ValidatorIndex]
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block_root*: Eth2Digest
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target_epoch*: Epoch
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ForkChoice* = object
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backend*: ForkChoiceBackend
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checkpoints*: Checkpoints
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queuedAttestations*: seq[QueuedAttestation]
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func shortlog*(vote: VoteTracker): auto =
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(
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current_root: vote.current_root,
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next_root: vote.next_root,
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next_epoch: vote.next_epoch
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)
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chronicles.formatIt VoteTracker: it.shortLog
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chronicles.formatIt ForkChoiceError: $it
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