175 lines
7.2 KiB
Nim
175 lines
7.2 KiB
Nim
# beacon_chain
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# Copyright (c) 2020 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 libraries
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std/[deques, options, sequtils, sets],
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# Status libraries
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chronicles, json_serialization/std/sets as jsonSets,
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# Internal
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./spec/[crypto, datatypes, helpers, state_transition_block],
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./block_pools/[chain_dag, clearance, quarantine],
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./beacon_node_types
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export beacon_node_types, sets
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logScope: topics = "slashpool"
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proc init*(
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T: type ExitPool, chainDag: ChainDAGRef, quarantine: QuarantineRef): T =
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## Initialize an ExitPool from the chainDag `headState`
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T(
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attester_slashings:
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initDeque[AttesterSlashing](initialSize = MAX_ATTESTER_SLASHINGS.int),
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proposer_slashings:
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initDeque[ProposerSlashing](initialSize = MAX_PROPOSER_SLASHINGS.int),
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voluntary_exits:
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initDeque[SignedVoluntaryExit](initialSize = MAX_VOLUNTARY_EXITS.int),
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chainDag: chainDag,
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quarantine: quarantine
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)
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func addExitMessage*(subpool: var auto, exitMessage, bound: auto) =
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# Prefer newer to older exit message
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while subpool.lenu64 >= bound:
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discard subpool.popFirst()
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subpool.addLast(exitMessage)
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doAssert subpool.lenu64 <= bound
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func getExitMessagesForBlock[T](subpool: var Deque[T], bound: uint64): seq[T] =
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for i in 0 ..< bound:
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if subpool.len == 0:
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break
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result.add subpool.popFirst()
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doAssert result.lenu64 <= bound
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func getAttesterSlashingsForBlock*(pool: var ExitPool):
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seq[AttesterSlashing] =
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## Retrieve attester slashings that may be added to a new block
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getExitMessagesForBlock[AttesterSlashing](
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pool.attester_slashings, MAX_ATTESTER_SLASHINGS)
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func getProposerSlashingsForBlock*(pool: var ExitPool):
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seq[ProposerSlashing] =
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## Retrieve proposer slashings that may be added to a new block
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getExitMessagesForBlock[ProposerSlashing](
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pool.proposer_slashings, MAX_PROPOSER_SLASHINGS)
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func getVoluntaryExitsForBlock*(pool: var ExitPool):
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seq[SignedVoluntaryExit] =
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## Retrieve voluntary exits that may be added to a new block
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getExitMessagesForBlock[SignedVoluntaryExit](
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pool.voluntary_exits, MAX_VOLUNTARY_EXITS)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.3/specs/phase0/p2p-interface.md#attester_slashing
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proc validateAttesterSlashing*(
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pool: var ExitPool, attester_slashing: AttesterSlashing):
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Result[bool, (ValidationResult, cstring)] =
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# [IGNORE] At least one index in the intersection of the attesting indices of
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# each attestation has not yet been seen in any prior attester_slashing (i.e.
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# attester_slashed_indices = set(attestation_1.attesting_indices).intersection(attestation_2.attesting_indices),
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# verify if any(attester_slashed_indices.difference(prior_seen_attester_slashed_indices))).
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# TODO sequtils2 should be able to make this more reasonable, from asSeq on
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# down
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let attester_slashed_indices =
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toHashSet(mapIt(
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attester_slashing.attestation_1.attesting_indices.asSeq,
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it.ValidatorIndex)) *
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toHashSet(mapIt(
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attester_slashing.attestation_2.attesting_indices.asSeq,
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it.ValidatorIndex))
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if not disjoint(
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attester_slashed_indices, pool.prior_seen_attester_slashed_indices):
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const err_str: cstring =
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"validateAttesterSlashing: attester-slashed index already attester-slashed"
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return err((EVRESULT_IGNORE, err_str))
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# [REJECT] All of the conditions within process_attester_slashing pass
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# validation.
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var cache =
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getStateCache(pool.chainDag.head,
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pool.chainDag.headState.data.data.slot.compute_epoch_at_slot)
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let attester_slashing_validity =
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check_attester_slashing(
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pool.chainDag.headState.data.data, attester_slashing, {}, cache)
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if attester_slashing_validity.isErr:
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return err((EVRESULT_REJECT, attester_slashing_validity.error))
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pool.prior_seen_attester_slashed_indices.incl attester_slashed_indices
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pool.attester_slashings.addExitMessage(
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attester_slashing, MAX_ATTESTER_SLASHINGS)
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ok(true)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.3/specs/phase0/p2p-interface.md#proposer_slashing
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proc validateProposerSlashing*(
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pool: var ExitPool, proposer_slashing: ProposerSlashing):
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Result[bool, (ValidationResult, cstring)] =
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# [IGNORE] The proposer slashing is the first valid proposer slashing
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# received for the proposer with index
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# proposer_slashing.signed_header_1.message.proposer_index.
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if proposer_slashing.signed_header_1.message.proposer_index.ValidatorIndex in
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pool.prior_seen_proposer_slashed_indices:
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const err_str: cstring =
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"validateProposerSlashing: proposer-slashed index already proposer-slashed"
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return err((EVRESULT_IGNORE, err_str))
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# [REJECT] All of the conditions within process_proposer_slashing pass validation.
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var cache =
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getStateCache(pool.chainDag.head,
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pool.chainDag.headState.data.data.slot.compute_epoch_at_slot)
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let proposer_slashing_validity =
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check_proposer_slashing(
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pool.chainDag.headState.data.data, proposer_slashing, {}, cache)
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if proposer_slashing_validity.isErr:
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return err((EVRESULT_REJECT, proposer_slashing_validity.error))
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pool.prior_seen_proposer_slashed_indices.incl(
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proposer_slashing.signed_header_1.message.proposer_index.ValidatorIndex)
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pool.proposer_slashings.addExitMessage(
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proposer_slashing, MAX_PROPOSER_SLASHINGS)
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ok(true)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.12.3/specs/phase0/p2p-interface.md#voluntary_exit
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proc validateVoluntaryExit*(
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pool: var ExitPool, signed_voluntary_exit: SignedVoluntaryExit):
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Result[bool, (ValidationResult, cstring)] =
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# [IGNORE] The voluntary exit is the first valid voluntary exit received for
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# the validator with index signed_voluntary_exit.message.validator_index.
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if signed_voluntary_exit.message.validator_index >=
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pool.chainDag.headState.data.data.validators.lenu64:
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const err_str: cstring = "validateVoluntaryExit: validator index too high"
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return err((EVRESULT_IGNORE, err_str))
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if signed_voluntary_exit.message.validator_index.ValidatorIndex in
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pool.prior_seen_voluntary_exit_indices:
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const err_str: cstring = "validateVoluntaryExit: validator index already voluntarily exited"
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return err((EVRESULT_IGNORE, err_str))
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# [REJECT] All of the conditions within process_voluntary_exit pass
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# validation.
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var cache =
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getStateCache(pool.chainDag.head,
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pool.chainDag.headState.data.data.slot.compute_epoch_at_slot)
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let voluntary_exit_validity =
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check_voluntary_exit(
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pool.chainDag.headState.data.data, signed_voluntary_exit, {}, cache)
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if voluntary_exit_validity.isErr:
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return err((EVRESULT_REJECT, voluntary_exit_validity.error))
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pool.prior_seen_voluntary_exit_indices.incl(
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signed_voluntary_exit.message.validator_index.ValidatorIndex)
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pool.voluntary_exits.addExitMessage(
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signed_voluntary_exit, MAX_VOLUNTARY_EXITS)
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ok(true)
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