nimbus-eth2/beacon_chain/validator_pool.nim

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import
tables, json, streams,
chronos, chronicles,
spec/[datatypes, crypto, digest, signatures, helpers],
beacon_node_types,
json_serialization/std/[sets, net],
validator_slashing_protection,
eth/db/[kvstore, kvstore_sqlite3]
func init*(T: type ValidatorPool,
slashingProtectionDB: SlashingProtectionDB): T =
## Initialize the validator pool and the slashing protection service
## `genesis_validator_root` is used as an unique ID for the
## blockchain
## `backend` is the KeyValue Store backend
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result.validators = initTable[ValidatorPubKey, AttachedValidator]()
result.slashingProtection = slashingProtectionDB
template count*(pool: ValidatorPool): int =
pool.validators.len
proc addLocalValidator*(pool: var ValidatorPool,
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pubKey: ValidatorPubKey,
privKey: ValidatorPrivKey) =
let v = AttachedValidator(pubKey: pubKey,
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kind: inProcess,
privKey: privKey)
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pool.validators[pubKey] = v
notice "Local validator attached", pubKey, validator = shortLog(v)
proc addRemoteValidator*(pool: var ValidatorPool,
pubKey: ValidatorPubKey,
v: AttachedValidator) =
pool.validators[pubKey] = v
notice "Remote validator attached", pubKey, validator = shortLog(v)
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proc getValidator*(pool: ValidatorPool,
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validatorKey: ValidatorPubKey): AttachedValidator =
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pool.validators.getOrDefault(validatorKey.initPubKey)
proc signWithRemoteValidator(v: AttachedValidator, data: Eth2Digest):
Future[ValidatorSig] {.async.} =
v.connection.inStream.writeLine(v.connection.pubKeyStr, " ", $data)
v.connection.inStream.flush()
var line = newStringOfCap(120).TaintedString
discard v.connection.outStream.readLine(line)
result = ValidatorSig.fromHex(line).get()
# TODO this is an ugly hack to fake a delay and subsequent async reordering
# for the purpose of testing the external validator delay - to be
# replaced by something more sensible
await sleepAsync(chronos.milliseconds(1))
# TODO: Honest validator - https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md
proc signBlockProposal*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest, slot: Slot,
blockRoot: Eth2Digest): Future[ValidatorSig] {.async.} =
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if v.kind == inProcess:
result = get_block_signature(
fork, genesis_validators_root, slot, blockRoot, v.privKey)
else:
let root = compute_block_root(fork, genesis_validators_root, slot, blockRoot)
result = await signWithRemoteValidator(v, root)
proc signAttestation*(v: AttachedValidator,
attestation: AttestationData,
fork: Fork, genesis_validators_root: Eth2Digest):
Future[ValidatorSig] {.async.} =
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if v.kind == inProcess:
result = get_attestation_signature(
fork, genesis_validators_root, attestation, v.privKey)
else:
let root = compute_attestation_root(fork, genesis_validators_root, attestation)
result = await signWithRemoteValidator(v, root)
proc produceAndSignAttestation*(validator: AttachedValidator,
attestationData: AttestationData,
committeeLen: int, indexInCommittee: int,
fork: Fork, genesis_validators_root: Eth2Digest):
Future[Attestation] {.async.} =
let validatorSignature = await validator.signAttestation(attestationData,
fork, genesis_validators_root)
var aggregationBits = CommitteeValidatorsBits.init(committeeLen)
aggregationBits.setBit indexInCommittee
return Attestation(data: attestationData, signature: validatorSignature, aggregation_bits: aggregationBits)
proc signAggregateAndProof*(v: AttachedValidator,
aggregate_and_proof: AggregateAndProof,
fork: Fork, genesis_validators_root: Eth2Digest):
Future[ValidatorSig] {.async.} =
if v.kind == inProcess:
result = get_aggregate_and_proof_signature(
fork, genesis_validators_root, aggregate_and_proof, v.privKey)
else:
let root = compute_aggregate_and_proof_root(
fork, genesis_validators_root, aggregate_and_proof)
result = await signWithRemoteValidator(v, root)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.0-rc.0/specs/phase0/validator.md#randao-reveal
func genRandaoReveal*(k: ValidatorPrivKey, fork: Fork,
genesis_validators_root: Eth2Digest, slot: Slot): ValidatorSig =
get_epoch_signature(
fork, genesis_validators_root, slot.compute_epoch_at_slot, k)
proc genRandaoReveal*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest, slot: Slot):
Future[ValidatorSig] {.async.} =
if v.kind == inProcess:
return genRandaoReveal(v.privKey, fork, genesis_validators_root, slot)
else:
let root = compute_epoch_root(
fork, genesis_validators_root, slot.compute_epoch_at_slot)
result = await signWithRemoteValidator(v, root)
proc getSlotSig*(v: AttachedValidator, fork: Fork,
genesis_validators_root: Eth2Digest, slot: Slot
): Future[ValidatorSig] {.async.} =
if v.kind == inProcess:
result = get_slot_signature(
fork, genesis_validators_root, slot, v.privKey)
else:
let root = compute_slot_root(fork, genesis_validators_root, slot)
result = await signWithRemoteValidator(v, root)