nimbus-eth2/beacon_chain/validators/validator_duties.nim

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# beacon_chain
# Copyright (c) 2018-2021 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
import
# Standard library
std/[os, osproc, sequtils, streams, tables],
# Nimble packages
stew/[assign2, byteutils, objects],
chronos, metrics,
chronicles, chronicles/timings,
json_serialization/std/[options, sets, net], serialization/errors,
eth/db/kvstore,
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eth/keys, eth/p2p/discoveryv5/[protocol, enr],
# Local modules
../spec/datatypes/[phase0, altair, merge],
disentangle eth2 types from the ssz library (#2785) * reorganize ssz dependencies This PR continues the work in https://github.com/status-im/nimbus-eth2/pull/2646, https://github.com/status-im/nimbus-eth2/pull/2779 as well as past issues with serialization and type, to disentangle SSZ from eth2 and at the same time simplify imports and exports with a structured approach. The principal idea here is that when a library wants to introduce SSZ support, they do so via 3 files: * `ssz_codecs` which imports and reexports `codecs` - this covers the basic byte conversions and ensures no overloads get lost * `xxx_merkleization` imports and exports `merkleization` to specialize and get access to `hash_tree_root` and friends * `xxx_ssz_serialization` imports and exports `ssz_serialization` to specialize ssz for a specific library Those that need to interact with SSZ always import the `xxx_` versions of the modules and never `ssz` itself so as to keep imports simple and safe. This is similar to how the REST / JSON-RPC serializers are structured in that someone wanting to serialize spec types to REST-JSON will import `eth2_rest_serialization` and nothing else. * split up ssz into a core library that is independendent of eth2 types * rename `bytes_reader` to `codec` to highlight that it contains coding and decoding of bytes and native ssz types * remove tricky List init overload that causes compile issues * get rid of top-level ssz import * reenable merkleization tests * move some "standard" json serializers to spec * remove `ValidatorIndex` serialization for now * remove test_ssz_merkleization * add tests for over/underlong byte sequences * fix broken seq[byte] test - seq[byte] is not an SSZ type There are a few things this PR doesn't solve: * like #2646 this PR is weak on how to handle root and other dontSerialize fields that "sometimes" should be computed - the same problem appears in REST / JSON-RPC etc * Fix a build problem on macOS * Another way to fix the macOS builds Co-authored-by: Zahary Karadjov <zahary@gmail.com>
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../spec/[
eth2_merkleization, forks, helpers, network, signatures, state_transition,
validator],
../consensus_object_pools/[
spec_cache, blockchain_dag, block_clearance, attestation_pool, exit_pool,
sync_committee_msg_pool],
../eth1/eth1_monitor,
../networking/eth2_network,
disentangle eth2 types from the ssz library (#2785) * reorganize ssz dependencies This PR continues the work in https://github.com/status-im/nimbus-eth2/pull/2646, https://github.com/status-im/nimbus-eth2/pull/2779 as well as past issues with serialization and type, to disentangle SSZ from eth2 and at the same time simplify imports and exports with a structured approach. The principal idea here is that when a library wants to introduce SSZ support, they do so via 3 files: * `ssz_codecs` which imports and reexports `codecs` - this covers the basic byte conversions and ensures no overloads get lost * `xxx_merkleization` imports and exports `merkleization` to specialize and get access to `hash_tree_root` and friends * `xxx_ssz_serialization` imports and exports `ssz_serialization` to specialize ssz for a specific library Those that need to interact with SSZ always import the `xxx_` versions of the modules and never `ssz` itself so as to keep imports simple and safe. This is similar to how the REST / JSON-RPC serializers are structured in that someone wanting to serialize spec types to REST-JSON will import `eth2_rest_serialization` and nothing else. * split up ssz into a core library that is independendent of eth2 types * rename `bytes_reader` to `codec` to highlight that it contains coding and decoding of bytes and native ssz types * remove tricky List init overload that causes compile issues * get rid of top-level ssz import * reenable merkleization tests * move some "standard" json serializers to spec * remove `ValidatorIndex` serialization for now * remove test_ssz_merkleization * add tests for over/underlong byte sequences * fix broken seq[byte] test - seq[byte] is not an SSZ type There are a few things this PR doesn't solve: * like #2646 this PR is weak on how to handle root and other dontSerialize fields that "sometimes" should be computed - the same problem appears in REST / JSON-RPC etc * Fix a build problem on macOS * Another way to fix the macOS builds Co-authored-by: Zahary Karadjov <zahary@gmail.com>
2021-08-18 18:57:58 +00:00
../sszdump, ../sync/sync_manager,
../gossip_processing/[block_processor, consensus_manager],
".."/[conf, beacon_clock, beacon_node, version],
"."/[slashing_protection, validator_pool, keystore_management]
# Metrics for tracking attestation and beacon block loss
const delayBuckets = [-Inf, -4.0, -2.0, -1.0, -0.5, -0.1, -0.05,
0.05, 0.1, 0.5, 1.0, 2.0, 4.0, 8.0, Inf]
declareCounter beacon_attestations_sent,
"Number of beacon chain attestations sent by this peer"
declareHistogram beacon_attestation_sent_delay,
"Time(s) between slot start and attestation sent moment",
buckets = delayBuckets
declareCounter beacon_sync_committee_messages_sent,
"Number of sync committee messages sent by this peer"
declareCounter beacon_sync_committee_contributions_sent,
"Number of sync committee contributions sent by this peer"
declareHistogram beacon_sync_committee_message_sent_delay,
"Time(s) between slot start and sync committee message sent moment",
buckets = delayBuckets
declareCounter beacon_blocks_proposed,
"Number of beacon chain blocks sent by this peer"
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declareGauge(attached_validator_balance,
"Validator balance at slot end of the first 64 validators, in Gwei",
labels = ["pubkey"])
declarePublicGauge(attached_validator_balance_total,
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"Validator balance of all attached validators, in Gwei")
logScope: topics = "beacval"
type
SendResult* = Result[void, cstring]
SendBlockResult* = Result[bool, cstring]
ForkedBlockResult* = Result[ForkedBeaconBlock, string]
proc findValidator(validators: auto, pubKey: ValidatorPubKey):
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Option[ValidatorIndex] =
let idx = validators.findIt(it.pubKey == pubKey)
if idx == -1:
# We allow adding a validator even if its key is not in the state registry:
# it might be that the deposit for this validator has not yet been processed
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notice "Validator deposit not yet processed, monitoring", pubKey
none(ValidatorIndex)
else:
some(idx.ValidatorIndex)
proc addLocalValidator(node: BeaconNode,
validators: auto,
item: ValidatorPrivateItem) =
let pubKey = item.privateKey.toPubKey()
node.attachedValidators[].addLocalValidator(
item,
findValidator(validators, pubKey.toPubKey()))
proc addLocalValidators*(node: BeaconNode) =
withState(node.dag.headState.data):
for validatorItem in node.config.validatorItems():
node.addLocalValidator(state.data.validators.asSeq(), validatorItem)
proc addRemoteValidators*(node: BeaconNode) {.raises: [Defect, OSError, IOError].} =
# load all the validators from the child process - loop until `end`
var line = newStringOfCap(120).TaintedString
while line != "end" and running(node.vcProcess):
if node.vcProcess.outputStream.readLine(line) and line != "end":
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let
performance fixes (#2259) * performance fixes * don't mark tree cache as dirty on read-only List accesses * store only blob in memory for keys and signatures, parse blob lazily * compare public keys by blob instead of parsing / converting to raw * compare Eth2Digest using non-constant-time comparison * avoid some unnecessary validator copying This branch will in particular speed up deposit processing which has been slowing down block replay. Pre (mainnet, 1600 blocks): ``` All time are ms Average, StdDev, Min, Max, Samples, Test Validation is turned off meaning that no BLS operations are performed 3450.269, 0.000, 3450.269, 3450.269, 1, Initialize DB 0.417, 0.822, 0.036, 21.098, 1400, Load block from database 16.521, 0.000, 16.521, 16.521, 1, Load state from database 27.906, 50.846, 8.104, 1507.633, 1350, Apply block 52.617, 37.029, 20.640, 135.938, 50, Apply epoch block ``` Post: ``` 3502.715, 0.000, 3502.715, 3502.715, 1, Initialize DB 0.080, 0.560, 0.035, 21.015, 1400, Load block from database 17.595, 0.000, 17.595, 17.595, 1, Load state from database 15.706, 11.028, 8.300, 107.537, 1350, Apply block 33.217, 12.622, 17.331, 60.580, 50, Apply epoch block ``` * more perf fixes * load EpochRef cache into StateCache more aggressively * point out security concern with public key cache * reuse proposer index from state when processing block * avoid genericAssign in a few more places * don't parse key when signature is unparseable * fix `==` overload for Eth2Digest * preallocate validator list when getting active validators * speed up proposer index calculation a little bit * reuse cache when replaying blocks in ncli_db * avoid a few more copying loops ``` Average, StdDev, Min, Max, Samples, Test Validation is turned off meaning that no BLS operations are performed 3279.158, 0.000, 3279.158, 3279.158, 1, Initialize DB 0.072, 0.357, 0.035, 13.400, 1400, Load block from database 17.295, 0.000, 17.295, 17.295, 1, Load state from database 5.918, 9.896, 0.198, 98.028, 1350, Apply block 15.888, 10.951, 7.902, 39.535, 50, Apply epoch block 0.000, 0.000, 0.000, 0.000, 0, Database block store ``` * clear full balance cache before processing rewards and penalties ``` All time are ms Average, StdDev, Min, Max, Samples, Test Validation is turned off meaning that no BLS operations are performed 3947.901, 0.000, 3947.901, 3947.901, 1, Initialize DB 0.124, 0.506, 0.026, 202.370, 363345, Load block from database 97.614, 0.000, 97.614, 97.614, 1, Load state from database 0.186, 0.188, 0.012, 99.561, 357262, Advance slot, non-epoch 14.161, 5.966, 1.099, 395.511, 11524, Advance slot, epoch 1.372, 4.170, 0.017, 276.401, 363345, Apply block, no slot processing 0.000, 0.000, 0.000, 0.000, 0, Database block store ```
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key = ValidatorPubKey.fromHex(line).get()
index = findValidator(
getStateField(node.dag.headState.data, validators).asSeq, key)
pk = key.load()
if pk.isSome():
New validator client using REST API. (#2651) * Initial commit. * Exporting getConfig(). * Add beacon node checking procedures. * Post rebase fixes. * Use runSlotLoop() from nimbus_beacon_node. Fallback implementation. Fixes for ETH2 REST serialization. * Add beacon_clock.durationToNextSlot(). Move type declarations from beacon_rest_api to json_rest_serialization. Fix seq[ValidatorIndex] serialization. Refactor ValidatorPool and add some utility procedures. Create separate version of validator_client. * Post-rebase fixes. Remove CookedPubKey from validator_pool.nim. * Now we should be able to produce attestations and aggregate and proofs. But its not working yet. * Debugging attestation sending. * Add durationToNextAttestation. Optimize some debug logs. Fix aggregation_bits encoding. Bump chronos/presto. * Its alive. * Fixes for launch_local_testnet script. Bump chronos. * Switch client API to not use `/api` prefix. * Post-rebase adjustments. * Fix endpoint for publishBlock(). * Add CONFIG_NAME. Add more checks to ensure that beacon_node is compatible. * Add beacon committee subscription support to validator_client. * Fix stacktrace should be an array of strings. Fix committee subscriptions should not be `data` keyed. * Log duration to next block proposal. * Fix beacon_node_status import. * Use jsonMsgResponse() instead of jsonError(). * Fix graffityBytes usage. Remove unnecessary `await`. Adjust creation of SignedBlock instance. Remove legacy files. * Rework durationToNextSlot() and durationToNextEpoch() to use `fromNow`. * Fix race condition for block proposal and attestations for same slot. Fix local_testnet script to properly kill tasks on Windows. Bump chronos and nim-http-tools, to allow connections to infura.io (basic auth). * Catch services errors. Improve performance of local_testnet.sh script on Windows. Fix race condition when attestation producing. * Post-rebase fixes. * Bump chronos and presto. * Calculate block publishing delay. Fix pkill in one more place. * Add error handling and timeouts to firstSuccess() template. Add onceToAll() template. Add checkNodes() procedure. Refactor firstSuccess() template. Add error checking to api.nim calls. * Deprecated usage onceToAll() for better stability. Address comment and send attestations asap. * Avoid unnecessary loop when calculating minimal duration.
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let v = AttachedValidator(pubKey: key,
index: index,
kind: ValidatorKind.Remote,
connection: ValidatorConnection(
inStream: node.vcProcess.inputStream,
outStream: node.vcProcess.outputStream,
pubKeyStr: $key))
New validator client using REST API. (#2651) * Initial commit. * Exporting getConfig(). * Add beacon node checking procedures. * Post rebase fixes. * Use runSlotLoop() from nimbus_beacon_node. Fallback implementation. Fixes for ETH2 REST serialization. * Add beacon_clock.durationToNextSlot(). Move type declarations from beacon_rest_api to json_rest_serialization. Fix seq[ValidatorIndex] serialization. Refactor ValidatorPool and add some utility procedures. Create separate version of validator_client. * Post-rebase fixes. Remove CookedPubKey from validator_pool.nim. * Now we should be able to produce attestations and aggregate and proofs. But its not working yet. * Debugging attestation sending. * Add durationToNextAttestation. Optimize some debug logs. Fix aggregation_bits encoding. Bump chronos/presto. * Its alive. * Fixes for launch_local_testnet script. Bump chronos. * Switch client API to not use `/api` prefix. * Post-rebase adjustments. * Fix endpoint for publishBlock(). * Add CONFIG_NAME. Add more checks to ensure that beacon_node is compatible. * Add beacon committee subscription support to validator_client. * Fix stacktrace should be an array of strings. Fix committee subscriptions should not be `data` keyed. * Log duration to next block proposal. * Fix beacon_node_status import. * Use jsonMsgResponse() instead of jsonError(). * Fix graffityBytes usage. Remove unnecessary `await`. Adjust creation of SignedBlock instance. Remove legacy files. * Rework durationToNextSlot() and durationToNextEpoch() to use `fromNow`. * Fix race condition for block proposal and attestations for same slot. Fix local_testnet script to properly kill tasks on Windows. Bump chronos and nim-http-tools, to allow connections to infura.io (basic auth). * Catch services errors. Improve performance of local_testnet.sh script on Windows. Fix race condition when attestation producing. * Post-rebase fixes. * Bump chronos and presto. * Calculate block publishing delay. Fix pkill in one more place. * Add error handling and timeouts to firstSuccess() template. Add onceToAll() template. Add checkNodes() procedure. Refactor firstSuccess() template. Add error checking to api.nim calls. * Deprecated usage onceToAll() for better stability. Address comment and send attestations asap. * Avoid unnecessary loop when calculating minimal duration.
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node.attachedValidators[].addRemoteValidator(key, v)
else:
warn "Could not load public key", line
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proc getAttachedValidator*(node: BeaconNode,
pubkey: ValidatorPubKey): AttachedValidator =
node.attachedValidators[].getValidator(pubkey)
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proc getAttachedValidator*(node: BeaconNode,
state_validators: auto,
idx: ValidatorIndex): AttachedValidator =
if idx < state_validators.len.ValidatorIndex:
let validator = node.getAttachedValidator(state_validators[idx].pubkey)
if validator != nil and validator.index != some(idx):
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# Update index, in case the validator was activated!
notice "Validator activated", pubkey = validator.pubkey, index = idx
validator.index = some(idx)
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validator
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else:
warn "Validator index out of bounds",
idx, validators = state_validators.len
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nil
proc getAttachedValidator*(node: BeaconNode,
epochRef: EpochRef,
idx: ValidatorIndex): AttachedValidator =
let key = epochRef.validatorKey(idx)
if key.isSome():
let validator = node.getAttachedValidator(key.get().toPubKey())
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if validator != nil and validator.index != some(idx.ValidatorIndex):
# Update index, in case the validator was activated!
notice "Validator activated", pubkey = validator.pubkey, index = idx
validator.index = some(idx.ValidatorIndex)
validator
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else:
warn "Validator key not found",
idx, epoch = epochRef.epoch
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nil
proc isSynced*(node: BeaconNode, head: BlockRef): bool =
## TODO This function is here as a placeholder for some better heurestics to
## determine if we're in sync and should be producing blocks and
## attestations. Generally, the problem is that slot time keeps advancing
## even when there are no blocks being produced, so there's no way to
## distinguish validators geniunely going missing from the node not being
## well connected (during a network split or an internet outage for
## example). It would generally be correct to simply keep running as if
## we were the only legit node left alive, but then we run into issues:
## with enough many empty slots, the validator pool is emptied leading
## to empty committees and lots of empty slot processing that will be
## thrown away as soon as we're synced again.
let
# The slot we should be at, according to the clock
beaconTime = node.beaconClock.now()
wallSlot = beaconTime.toSlot()
# TODO: MaxEmptySlotCount should likely involve the weak subjectivity period.
# TODO if everyone follows this logic, the network will not recover from a
# halt: nobody will be producing blocks because everone expects someone
# else to do it
if wallSlot.afterGenesis and head.slot + MaxEmptySlotCount < wallSlot.slot:
false
else:
true
proc sendAttestation*(
node: BeaconNode, attestation: Attestation,
subnet_id: SubnetId, checkSignature: bool): Future[SendResult] {.async.} =
# Validate attestation before sending it via gossip - validation will also
# register the attestation with the attestation pool. Notably, although
# libp2p calls the data handler for any subscription on the subnet
# topic, it does not perform validation.
let res = await node.processor.attestationValidator(
attestation, subnet_id, checkSignature)
return
if res.isOk():
node.network.broadcastAttestation(subnet_id, attestation)
beacon_attestations_sent.inc()
if not(isNil(node.onAttestationSent)):
node.onAttestationSent(attestation)
ok()
else:
notice "Produced attestation failed validation",
attestation = shortLog(attestation),
error = res.error()
err(res.error()[1])
proc sendSyncCommitteeMessage*(
node: BeaconNode, msg: SyncCommitteeMessage,
subcommitteeIdx: SyncSubcommitteeIndex,
checkSignature: bool): Future[SendResult] {.async.} =
# Validate sync committee message before sending it via gossip
# validation will also register the message with the sync committee
# message pool. Notably, although libp2p calls the data handler for
# any subscription on the subnet topic, it does not perform validation.
let res = node.processor.syncCommitteeMsgValidator(msg, subcommitteeIdx,
checkSignature)
return
if res.isOk():
node.network.broadcastSyncCommitteeMessage(msg, subcommitteeIdx)
beacon_sync_committee_messages_sent.inc()
SendResult.ok()
else:
notice "Sync committee message failed validation",
msg, error = res.error()
SendResult.err(res.error()[1])
proc sendSyncCommitteeMessages*(node: BeaconNode,
msgs: seq[SyncCommitteeMessage]
): Future[seq[SendResult]] {.async.} =
return withState(node.dag.headState.data):
when stateFork >= BeaconStateFork.Altair:
var statuses = newSeq[Option[SendResult]](len(msgs))
let
curPeriod = sync_committee_period(state.data.slot)
nextPeriod = curPeriod + 1
let (keysCur, keysNxt) =
block:
var resCur: Table[ValidatorPubKey, int]
var resNxt: Table[ValidatorPubKey, int]
for index, msg in msgs.pairs():
if msg.validator_index < lenu64(state.data.validators):
let msgPeriod = sync_committee_period(msg.slot)
if msgPeriod == curPeriod:
resCur[state.data.validators.asSeq[msg.validator_index].pubkey] = index
elif msgPeriod == nextPeriod:
resNxt[state.data.validators.asSeq[msg.validator_index].pubkey] = index
else:
statuses[index] =
some(SendResult.err("Message's slot out of state's head range"))
else:
statuses[index] = some(SendResult.err("Incorrect validator's index"))
if (len(resCur) == 0) and (len(resNxt) == 0):
return statuses.mapIt(it.get())
(resCur, resNxt)
let (pending, indices) = block:
var resFutures: seq[Future[SendResult]]
var resIndices: seq[int]
for committeeIdx in allSyncSubcommittees():
for valKey in syncSubcommittee(
state.data.current_sync_committee.pubkeys.data, committeeIdx):
let index = keysCur.getOrDefault(valKey, -1)
if index >= 0:
resIndices.add(index)
resFutures.add(node.sendSyncCommitteeMessage(msgs[index],
committeeIdx, true))
for committeeIdx in allSyncSubcommittees():
for valKey in syncSubcommittee(
state.data.next_sync_committee.pubkeys.data, committeeIdx):
let index = keysNxt.getOrDefault(valKey, -1)
if index >= 0:
resIndices.add(index)
resFutures.add(node.sendSyncCommitteeMessage(msgs[index],
committeeIdx, true))
(resFutures, resIndices)
await allFutures(pending)
for index, future in pending.pairs():
if future.done():
let fres = future.read()
if fres.isErr():
statuses[indices[index]] = some(SendResult.err(fres.error()))
else:
statuses[indices[index]] = some(SendResult.ok())
elif future.failed() or future.cancelled():
let exc = future.readError()
debug "Unexpected failure while sending committee message",
message = msgs[indices[index]], error = $exc.msg
statuses[indices[index]] = some(SendResult.err(
"Unexpected failure while sending committee message"))
var res: seq[SendResult]
for item in statuses:
if item.isSome():
res.add(item.get())
else:
res.add(SendResult.err("Message validator not in sync committee"))
res
else:
var res: seq[SendResult]
for _ in msgs:
res.add(SendResult.err("Waiting for altair fork"))
res
proc sendSyncCommitteeContribution*(
node: BeaconNode,
msg: SignedContributionAndProof,
checkSignature: bool): Future[SendResult] {.async.} =
let res = node.processor.syncCommitteeContributionValidator(
msg, checkSignature)
return
if res.isOk():
node.network.broadcastSignedContributionAndProof(msg)
beacon_sync_committee_contributions_sent.inc()
ok()
else:
notice "Sync committee contribution failed validation",
msg, error = res.error()
err(res.error()[1])
proc createAndSendAttestation(node: BeaconNode,
fork: Fork,
genesis_validators_root: Eth2Digest,
validator: AttachedValidator,
attestationData: AttestationData,
committeeLen: int,
indexInCommittee: int,
subnet_id: SubnetId) {.async.} =
try:
var
attestation = await validator.produceAndSignAttestation(
attestationData, committeeLen, indexInCommittee, fork,
genesis_validators_root)
let res = await node.sendAttestation(
attestation, subnet_id, checkSignature = false)
if not res.isOk(): # Logged in sendAttestation
return
if node.config.dumpEnabled:
New validator client using REST API. (#2651) * Initial commit. * Exporting getConfig(). * Add beacon node checking procedures. * Post rebase fixes. * Use runSlotLoop() from nimbus_beacon_node. Fallback implementation. Fixes for ETH2 REST serialization. * Add beacon_clock.durationToNextSlot(). Move type declarations from beacon_rest_api to json_rest_serialization. Fix seq[ValidatorIndex] serialization. Refactor ValidatorPool and add some utility procedures. Create separate version of validator_client. * Post-rebase fixes. Remove CookedPubKey from validator_pool.nim. * Now we should be able to produce attestations and aggregate and proofs. But its not working yet. * Debugging attestation sending. * Add durationToNextAttestation. Optimize some debug logs. Fix aggregation_bits encoding. Bump chronos/presto. * Its alive. * Fixes for launch_local_testnet script. Bump chronos. * Switch client API to not use `/api` prefix. * Post-rebase adjustments. * Fix endpoint for publishBlock(). * Add CONFIG_NAME. Add more checks to ensure that beacon_node is compatible. * Add beacon committee subscription support to validator_client. * Fix stacktrace should be an array of strings. Fix committee subscriptions should not be `data` keyed. * Log duration to next block proposal. * Fix beacon_node_status import. * Use jsonMsgResponse() instead of jsonError(). * Fix graffityBytes usage. Remove unnecessary `await`. Adjust creation of SignedBlock instance. Remove legacy files. * Rework durationToNextSlot() and durationToNextEpoch() to use `fromNow`. * Fix race condition for block proposal and attestations for same slot. Fix local_testnet script to properly kill tasks on Windows. Bump chronos and nim-http-tools, to allow connections to infura.io (basic auth). * Catch services errors. Improve performance of local_testnet.sh script on Windows. Fix race condition when attestation producing. * Post-rebase fixes. * Bump chronos and presto. * Calculate block publishing delay. Fix pkill in one more place. * Add error handling and timeouts to firstSuccess() template. Add onceToAll() template. Add checkNodes() procedure. Refactor firstSuccess() template. Add error checking to api.nim calls. * Deprecated usage onceToAll() for better stability. Address comment and send attestations asap. * Avoid unnecessary loop when calculating minimal duration.
2021-07-13 11:15:07 +00:00
dump(node.config.dumpDirOutgoing, attestation.data,
validator.pubKey)
let wallTime = node.beaconClock.now()
let deadline = attestationData.slot.toBeaconTime() +
seconds(int(SECONDS_PER_SLOT div 3))
let (delayStr, delaySecs) =
if wallTime < deadline:
("-" & $(deadline - wallTime), -toFloatSeconds(deadline - wallTime))
else:
($(wallTime - deadline), toFloatSeconds(wallTime - deadline))
notice "Attestation sent",
attestation = shortLog(attestation), validator = shortLog(validator),
delay = delayStr, subnet_id
beacon_attestation_sent_delay.observe(delaySecs)
except CatchableError as exc:
# An error could happen here when the signature task fails - we must
# not leak the exception because this is an asyncSpawn task
notice "Error sending attestation", err = exc.msg
proc getBlockProposalEth1Data*(node: BeaconNode,
state: ForkedHashedBeaconState):
BlockProposalEth1Data =
if node.eth1Monitor.isNil:
var pendingDepositsCount =
getStateField(state, eth1_data).deposit_count -
getStateField(state, eth1_deposit_index)
if pendingDepositsCount > 0:
result.hasMissingDeposits = true
else:
result.vote = getStateField(state, eth1_data)
else:
let finalizedEpochRef = node.dag.getFinalizedEpochRef()
result = node.eth1Monitor.getBlockProposalData(
state, finalizedEpochRef.eth1_data,
finalizedEpochRef.eth1_deposit_index)
proc makeBeaconBlockForHeadAndSlot*(node: BeaconNode,
randao_reveal: ValidatorSig,
validator_index: ValidatorIndex,
graffiti: GraffitiBytes,
head: BlockRef, slot: Slot
): Future[ForkedBlockResult] {.async.} =
# Advance state to the slot that we're proposing for
let
proposalState = assignClone(node.dag.headState)
node.dag.withState(proposalState[], head.atSlot(slot - 1)):
# Advance to the given slot without calculating state root - we'll only
# need a state root _with_ the block applied
var info: ForkedEpochInfo
if not process_slots(
node.dag.cfg, stateData.data, slot, cache, info,
{skipLastStateRootCalculation}):
return ForkedBlockResult.err("Unable to advance state to slot")
let
eth1Proposal = node.getBlockProposalEth1Data(stateData.data)
if eth1Proposal.hasMissingDeposits:
error "Eth1 deposits not available. Skipping block proposal", slot
return ForkedBlockResult.err("Eth1 deposits not available")
let exits = withState(stateData.data):
node.exitPool[].getBeaconBlockExits(state.data)
return makeBeaconBlock(
node.dag.cfg,
stateData.data,
validator_index,
randao_reveal,
eth1Proposal.vote,
graffiti,
node.attestationPool[].getAttestationsForBlock(stateData.data, cache),
eth1Proposal.deposits,
exits,
if slot.epoch < node.dag.cfg.ALTAIR_FORK_EPOCH:
SyncAggregate.init()
else:
node.sync_committee_msg_pool[].produceSyncAggregate(head.root),
default(merge.ExecutionPayload),
noRollback, # Temporary state - no need for rollback
cache)
proc proposeSignedBlock*(node: BeaconNode,
head: BlockRef,
validator: AttachedValidator,
newBlock: ForkedSignedBeaconBlock):
Future[BlockRef] {.async.} =
let wallTime = node.beaconClock.now()
return withBlck(newBlock):
let newBlockRef = node.blockProcessor[].storeBlock(
blck, wallTime.slotOrZero())
if newBlockRef.isErr:
warn "Unable to add proposed block to block pool",
newBlock = blck.message, root = blck.root
return head
notice "Block proposed",
blockRoot = shortLog(blck.root), blck = shortLog(blck.message),
signature = shortLog(blck.signature), validator = shortLog(validator)
node.network.broadcastBeaconBlock(blck)
beacon_blocks_proposed.inc()
newBlockRef.get()
proc proposeBlock(node: BeaconNode,
validator: AttachedValidator,
validator_index: ValidatorIndex,
head: BlockRef,
slot: Slot): Future[BlockRef] {.async.} =
if head.slot >= slot:
# We should normally not have a head newer than the slot we're proposing for
# but this can happen if block proposal is delayed
warn "Skipping proposal, have newer head already",
headSlot = shortLog(head.slot),
headBlockRoot = shortLog(head.root),
slot = shortLog(slot)
return head
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesis_validators_root =
getStateField(node.dag.headState.data, genesis_validators_root)
randao = await validator.genRandaoReveal(
fork, genesis_validators_root, slot)
var newBlock = await makeBeaconBlockForHeadAndSlot(
node, randao, validator_index, node.graffitiBytes, head, slot)
if newBlock.isErr():
return head # already logged elsewhere!
let blck = newBlock.get()
# TODO abstract this, or move it into makeBeaconBlockForHeadAndSlot, and in
# general this is far too much copy/paste
let forked = case blck.kind:
of BeaconBlockFork.Phase0:
let root = hash_tree_root(blck.phase0Data)
# TODO: recomputed in block proposal
let signing_root = compute_block_root(
fork, genesis_validators_root, slot, root)
let notSlashable = node.attachedValidators
.slashingProtection
.registerBlock(validator_index, validator.pubkey, slot, signing_root)
if notSlashable.isErr:
warn "Slashing protection activated",
validator = validator.pubkey,
slot = slot,
existingProposal = notSlashable.error
return head
let signature = await validator.signBlockProposal(
fork, genesis_validators_root, slot, root)
ForkedSignedBeaconBlock.init(
phase0.SignedBeaconBlock(
message: blck.phase0Data, root: root, signature: signature)
)
of BeaconBlockFork.Altair:
let root = hash_tree_root(blck.altairData)
# TODO: recomputed in block proposal
let signing_root = compute_block_root(
fork, genesis_validators_root, slot, root)
let notSlashable = node.attachedValidators
.slashingProtection
.registerBlock(validator_index, validator.pubkey, slot, signing_root)
if notSlashable.isErr:
warn "Slashing protection activated",
validator = validator.pubkey,
slot = slot,
existingProposal = notSlashable.error
return head
let signature = await validator.signBlockProposal(
fork, genesis_validators_root, slot, root)
ForkedSignedBeaconBlock.init(
altair.SignedBeaconBlock(
message: blck.altairData, root: root, signature: signature)
)
of BeaconBlockFork.Merge:
let root = hash_tree_root(blck.mergeData)
# TODO: recomputed in block proposal
let signing_root = compute_block_root(
fork, genesis_validators_root, slot, root)
let notSlashable = node.attachedValidators
.slashingProtection
.registerBlock(validator_index, validator.pubkey, slot, signing_root)
if notSlashable.isErr:
warn "Slashing protection activated",
validator = validator.pubkey,
slot = slot,
existingProposal = notSlashable.error
return head
let signature = await validator.signBlockProposal(
fork, genesis_validators_root, slot, root)
ForkedSignedBeaconBlock.init(
merge.SignedBeaconBlock(
message: blck.mergeData, root: root, signature: signature)
)
return await node.proposeSignedBlock(head, validator, forked)
proc handleAttestations(node: BeaconNode, head: BlockRef, slot: Slot) =
## Perform all attestations that the validators attached to this node should
## perform during the given slot
if slot + SLOTS_PER_EPOCH < head.slot:
# The latest block we know about is a lot newer than the slot we're being
# asked to attest to - this makes it unlikely that it will be included
# at all.
# TODO the oldest attestations allowed are those that are older than the
# finalized epoch.. also, it seems that posting very old attestations
# is risky from a slashing perspective. More work is needed here.
warn "Skipping attestation, head is too recent",
headSlot = shortLog(head.slot),
slot = shortLog(slot)
return
let attestationHead = head.atSlot(slot)
if head != attestationHead.blck:
# In rare cases, such as when we're busy syncing or just slow, we'll be
# attesting to a past state - we must then recreate the world as it looked
# like back then
notice "Attesting to a state in the past, falling behind?",
headSlot = shortLog(head.slot),
attestationHeadSlot = shortLog(attestationHead.slot),
attestationSlot = shortLog(slot)
trace "Checking attestations",
attestationHeadRoot = shortLog(attestationHead.blck.root),
attestationSlot = shortLog(slot)
# We need to run attestations exactly for the slot that we're attesting to.
# In case blocks went missing, this means advancing past the latest block
# using empty slots as fillers.
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#validator-assignments
2020-08-10 13:21:31 +00:00
let
epochRef = node.dag.getEpochRef(
2020-08-10 13:21:31 +00:00
attestationHead.blck, slot.compute_epoch_at_slot())
committees_per_slot = get_committee_count_per_slot(epochRef)
fork = node.dag.forkAtEpoch(slot.epoch)
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genesis_validators_root =
getStateField(node.dag.headState.data, genesis_validators_root)
2020-08-10 13:21:31 +00:00
for committee_index in get_committee_indices(epochRef):
let committee = get_beacon_committee(epochRef, slot, committee_index)
2020-08-10 13:21:31 +00:00
for index_in_committee, validator_index in committee:
let validator = node.getAttachedValidator(epochRef, validator_index)
if validator == nil:
continue
let
data = makeAttestationData(epochRef, attestationHead, committee_index)
# TODO signing_root is recomputed in produceAndSignAttestation/signAttestation just after
signing_root = compute_attestation_root(
fork, genesis_validators_root, data)
registered = node.attachedValidators
.slashingProtection
.registerAttestation(
validator_index,
New validator client using REST API. (#2651) * Initial commit. * Exporting getConfig(). * Add beacon node checking procedures. * Post rebase fixes. * Use runSlotLoop() from nimbus_beacon_node. Fallback implementation. Fixes for ETH2 REST serialization. * Add beacon_clock.durationToNextSlot(). Move type declarations from beacon_rest_api to json_rest_serialization. Fix seq[ValidatorIndex] serialization. Refactor ValidatorPool and add some utility procedures. Create separate version of validator_client. * Post-rebase fixes. Remove CookedPubKey from validator_pool.nim. * Now we should be able to produce attestations and aggregate and proofs. But its not working yet. * Debugging attestation sending. * Add durationToNextAttestation. Optimize some debug logs. Fix aggregation_bits encoding. Bump chronos/presto. * Its alive. * Fixes for launch_local_testnet script. Bump chronos. * Switch client API to not use `/api` prefix. * Post-rebase adjustments. * Fix endpoint for publishBlock(). * Add CONFIG_NAME. Add more checks to ensure that beacon_node is compatible. * Add beacon committee subscription support to validator_client. * Fix stacktrace should be an array of strings. Fix committee subscriptions should not be `data` keyed. * Log duration to next block proposal. * Fix beacon_node_status import. * Use jsonMsgResponse() instead of jsonError(). * Fix graffityBytes usage. Remove unnecessary `await`. Adjust creation of SignedBlock instance. Remove legacy files. * Rework durationToNextSlot() and durationToNextEpoch() to use `fromNow`. * Fix race condition for block proposal and attestations for same slot. Fix local_testnet script to properly kill tasks on Windows. Bump chronos and nim-http-tools, to allow connections to infura.io (basic auth). * Catch services errors. Improve performance of local_testnet.sh script on Windows. Fix race condition when attestation producing. * Post-rebase fixes. * Bump chronos and presto. * Calculate block publishing delay. Fix pkill in one more place. * Add error handling and timeouts to firstSuccess() template. Add onceToAll() template. Add checkNodes() procedure. Refactor firstSuccess() template. Add error checking to api.nim calls. * Deprecated usage onceToAll() for better stability. Address comment and send attestations asap. * Avoid unnecessary loop when calculating minimal duration.
2021-07-13 11:15:07 +00:00
validator.pubkey,
data.source.epoch,
data.target.epoch,
signing_root)
if registered.isOk():
let subnet_id = compute_subnet_for_attestation(
committees_per_slot, data.slot, data.index.CommitteeIndex)
asyncSpawn createAndSendAttestation(
node, fork, genesis_validators_root, validator, data,
committee.len(), index_in_committee, subnet_id)
else:
warn "Slashing protection activated for attestation",
validator = validator.pubkey,
badVoteDetails = $registered.error()
proc createAndSendSyncCommitteeMessage(node: BeaconNode,
slot: Slot,
validator: AttachedValidator,
subcommitteeIdx: SyncSubcommitteeIndex,
head: BlockRef) {.async.} =
try:
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesisValidatorsRoot = node.dag.genesisValidatorsRoot
msg = await signSyncCommitteeMessage(validator, slot, fork,
genesisValidatorsRoot, head.root)
let res = await node.sendSyncCommitteeMessage(
msg, subcommitteeIdx, checkSignature = false)
if res.isErr():
# Logged in sendSyncCommitteeMessage
return
if node.config.dumpEnabled:
dump(node.config.dumpDirOutgoing, msg, validator.pubKey)
let
wallTime = node.beaconClock.now()
deadline = msg.slot.toBeaconTime() +
seconds(int(SECONDS_PER_SLOT div 3))
let (delayStr, delaySecs) =
if wallTime < deadline:
("-" & $(deadline - wallTime), -toFloatSeconds(deadline - wallTime))
else:
($(wallTime - deadline), toFloatSeconds(wallTime - deadline))
notice "Sync committee message sent",
message = shortLog(msg),
validator = shortLog(validator),
delay = delayStr
beacon_sync_committee_message_sent_delay.observe(delaySecs)
except CatchableError as exc:
# An error could happen here when the signature task fails - we must
# not leak the exception because this is an asyncSpawn task
notice "Error sending sync committee message", err = exc.msg
proc handleSyncCommitteeMessages(node: BeaconNode, head: BlockRef, slot: Slot) =
# TODO Use a view type to avoid the copy
var syncCommittee = @(node.dag.syncCommitteeParticipants(slot + 1))
for committeeIdx in allSyncSubcommittees():
for valKey in syncSubcommittee(syncCommittee, committeeIdx):
let validator = node.getAttachedValidator(valKey)
if isNil(validator) or validator.index.isNone():
continue
asyncSpawn createAndSendSyncCommitteeMessage(node, slot, validator,
committeeIdx, head)
proc signAndSendContribution(node: BeaconNode,
validator: AttachedValidator,
contribution: SyncCommitteeContribution,
selectionProof: ValidatorSig) {.async.} =
try:
let msg = (ref SignedContributionAndProof)(
message: ContributionAndProof(
aggregator_index: uint64 validator.index.get,
contribution: contribution,
selection_proof: selectionProof))
await validator.sign(msg,
node.dag.forkAtEpoch(contribution.slot.epoch),
node.dag.genesisValidatorsRoot)
# Failures logged in sendSyncCommitteeContribution
discard await node.sendSyncCommitteeContribution(msg[], false)
notice "Contribution sent", contribution = shortLog(msg[])
except CatchableError as exc:
# An error could happen here when the signature task fails - we must
# not leak the exception because this is an asyncSpawn task
notice "Error sending sync committee contribution", err = exc.msg
proc handleSyncCommitteeContributions(node: BeaconNode,
head: BlockRef, slot: Slot) {.async.} =
# TODO Use a view type to avoid the copy
let
fork = node.dag.forkAtEpoch(slot.epoch)
genesisValidatorsRoot = node.dag.genesisValidatorsRoot
syncCommittee = @(node.dag.syncCommitteeParticipants(slot + 1))
type
AggregatorCandidate = object
validator: AttachedValidator
subcommitteeIdx: SyncSubcommitteeIndex
var candidateAggregators: seq[AggregatorCandidate]
var selectionProofs: seq[Future[ValidatorSig]]
var time = timeIt:
for subcommitteeIdx in allSyncSubcommittees():
# TODO Hoist outside of the loop with a view type
# to avoid the repeated offset calculations
for valKey in syncSubcommittee(syncCommittee, subcommitteeIdx):
let validator = node.getAttachedValidator(valKey)
if validator == nil:
continue
candidateAggregators.add AggregatorCandidate(
validator: validator,
subcommitteeIdx: subcommitteeIdx)
selectionProofs.add validator.getSyncCommitteeSelectionProof(
fork, genesisValidatorsRoot, slot, subcommitteeIdx.asUInt64)
await allFutures(selectionProofs)
debug "Prepared contributions selection proofs",
count = selectionProofs.len, time
var contributionsSent = 0
time = timeIt:
for i in 0 ..< selectionProofs.len:
if not selectionProofs[i].completed:
continue
let selectionProof = selectionProofs[i].read
if not is_sync_committee_aggregator(selectionProof):
continue
var contribution: SyncCommitteeContribution
let contributionWasProduced = node.syncCommitteeMsgPool[].produceContribution(
slot,
head.root,
candidateAggregators[i].subcommitteeIdx,
contribution)
if contributionWasProduced:
asyncSpawn signAndSendContribution(
node,
candidateAggregators[i].validator,
contribution,
selectionProof)
inc contributionsSent
else:
debug "Failure to produce contribution",
slot, head, subnet_id = candidateAggregators[i].subcommitteeIdx
proc handleProposal(node: BeaconNode, head: BlockRef, slot: Slot):
Future[BlockRef] {.async.} =
## Perform the proposal for the given slot, iff we have a validator attached
## that is supposed to do so, given the shuffling at that slot for the given
## head - to compute the proposer, we need to advance a state to the given
## slot
let proposer = node.dag.getProposer(head, slot)
if proposer.isNone():
return head
let
proposerKey = node.dag.validatorKey(proposer.get).get().toPubKey
validator = node.attachedValidators[].getValidator(proposerKey)
if validator != nil:
return await proposeBlock(node, validator, proposer.get(), head, slot)
debug "Expecting block proposal",
headRoot = shortLog(head.root),
slot = shortLog(slot),
proposer_index = proposer.get(),
proposer = shortLog(proposerKey)
return head
proc makeAggregateAndProof*(
pool: var AttestationPool, epochRef: EpochRef, slot: Slot, index: CommitteeIndex,
validatorIndex: ValidatorIndex, slot_signature: ValidatorSig): Option[AggregateAndProof] =
doAssert validatorIndex in get_beacon_committee(epochRef, slot, index)
doAssert index.uint64 < get_committee_count_per_slot(epochRef)
# TODO for testing purposes, refactor this into the condition check
# and just calculation
# https://github.com/ethereum/consensus-specs/blob/v1.1.5/specs/phase0/validator.md#aggregation-selection
if not is_aggregator(epochRef, slot, index, slot_signature):
return none(AggregateAndProof)
let maybe_slot_attestation = getAggregatedAttestation(pool, slot, index)
if maybe_slot_attestation.isNone:
return none(AggregateAndProof)
# https://github.com/ethereum/consensus-specs/blob/v1.1.5/specs/phase0/validator.md#construct-aggregate
# https://github.com/ethereum/consensus-specs/blob/v1.1.5/specs/phase0/validator.md#aggregateandproof
some(AggregateAndProof(
aggregator_index: validatorIndex.uint64,
aggregate: maybe_slot_attestation.get,
selection_proof: slot_signature))
proc sendAggregatedAttestations(
node: BeaconNode, aggregationHead: BlockRef, aggregationSlot: Slot) {.async.} =
# The index is via a
# locally attested validator. Unlike in handleAttestations(...) there's a
# single one at most per slot (because that's how aggregation attestation
# works), so the machinery that has to handle looping across, basically a
# set of locally attached validators is in principle not necessary, but a
# way to organize this. Then the private key for that validator should be
# the corresponding one -- whatver they are, they match.
let
epochRef = node.dag.getEpochRef(aggregationHead, aggregationSlot.epoch)
fork = node.dag.forkAtEpoch(aggregationSlot.epoch)
genesis_validators_root =
getStateField(node.dag.headState.data, genesis_validators_root)
committees_per_slot = get_committee_count_per_slot(epochRef)
var
slotSigs: seq[Future[ValidatorSig]] = @[]
slotSigsData: seq[tuple[committee_index: uint64,
validator_idx: ValidatorIndex,
v: AttachedValidator]] = @[]
for committee_index in 0'u64..<committees_per_slot:
let committee = get_beacon_committee(
epochRef, aggregationSlot, committee_index.CommitteeIndex)
for index_in_committee, validatorIdx in committee:
let validator = node.getAttachedValidator(epochRef, validatorIdx)
if validator != nil:
# the validator index and private key pair.
slotSigs.add getSlotSig(validator, fork,
genesis_validators_root, aggregationSlot)
slotSigsData.add (committee_index, validatorIdx, validator)
await allFutures(slotSigs)
for curr in zip(slotSigsData, slotSigs):
let aggregateAndProof =
makeAggregateAndProof(node.attestationPool[], epochRef, aggregationSlot,
curr[0].committee_index.CommitteeIndex,
curr[0].validator_idx,
curr[1].read)
# Don't broadcast when, e.g., this node isn't aggregator
if aggregateAndProof.isSome:
let sig = await signAggregateAndProof(curr[0].v,
aggregateAndProof.get, fork, genesis_validators_root)
var signedAP = SignedAggregateAndProof(
message: aggregateAndProof.get,
signature: sig)
node.network.broadcastAggregateAndProof(signedAP)
# The subnet on which the attestations (should have) arrived
let subnet_id = compute_subnet_for_attestation(
committees_per_slot, signedAP.message.aggregate.data.slot,
signedAP.message.aggregate.data.index.CommitteeIndex)
notice "Aggregated attestation sent",
attestation = shortLog(signedAP.message.aggregate),
aggregator_index = signedAP.message.aggregator_index,
signature = shortLog(signedAP.signature),
validator = shortLog(curr[0].v),
subnet_id
2020-12-16 13:03:04 +00:00
proc updateValidatorMetrics*(node: BeaconNode) =
# Technically, this only needs to be done on epoch transitions and if there's
# a reorg that spans an epoch transition, but it's easier to implement this
# way for now.
# We'll limit labelled metrics to the first 64, so that we don't overload
# Prometheus.
var total: Gwei
var i = 0
for _, v in node.attachedValidators[].validators:
let balance =
if v.index.isNone():
0.Gwei
elif v.index.get().uint64 >=
getStateField(node.dag.headState.data, balances).lenu64:
debug "Cannot get validator balance, index out of bounds",
pubkey = shortLog(v.pubkey), index = v.index.get(),
balances = getStateField(node.dag.headState.data, balances).len,
stateRoot = getStateRoot(node.dag.headState.data)
0.Gwei
else:
getStateField(node.dag.headState.data, balances).asSeq()[v.index.get()]
if i < 64:
attached_validator_balance.set(
balance.toGaugeValue, labelValues = [shortLog(v.pubkey)])
inc i
total += balance
node.attachedValidatorBalanceTotal = total
attached_validator_balance_total.set(total.toGaugeValue)
2020-11-27 23:34:25 +00:00
proc handleValidatorDuties*(node: BeaconNode, lastSlot, slot: Slot) {.async.} =
## Perform validator duties - create blocks, vote and aggregate existing votes
if node.attachedValidators[].count == 0:
# Nothing to do because we have no validator attached
return
# The dag head might be updated by sync while we're working due to the
# await calls, thus we use a local variable to keep the logic straight here
var head = node.dag.head
if not node.isSynced(head):
notice "Syncing in progress; skipping validator duties for now",
slot, headSlot = head.slot
2020-12-16 13:03:04 +00:00
# Rewards will be growing though, as we sync..
updateValidatorMetrics(node)
return
var curSlot = lastSlot + 1
# If broadcastStartEpoch is 0, it hasn't had time to initialize yet, which
# means that it'd be okay not to continue, but it won't gossip regardless.
if curSlot.epoch <
node.processor[].doppelgangerDetection.broadcastStartEpoch and
node.config.doppelgangerDetection:
debug "Waiting to gossip out to detect potential duplicate validators",
broadcastStartEpoch =
node.processor[].doppelgangerDetection.broadcastStartEpoch
return
# Start by checking if there's work we should have done in the past that we
# can still meaningfully do
while curSlot < slot:
notice "Catching up on validator duties",
curSlot = shortLog(curSlot),
lastSlot = shortLog(lastSlot),
slot = shortLog(slot)
# For every slot we're catching up, we'll propose then send
# attestations - head should normally be advancing along the same branch
# in this case
head = await handleProposal(node, head, curSlot)
# For each slot we missed, we need to send out attestations - if we were
# proposing during this time, we'll use the newly proposed head, else just
# keep reusing the same - the attestation that goes out will actually
# rewind the state to what it looked like at the time of that slot
handleAttestations(node, head, curSlot)
curSlot += 1
head = await handleProposal(node, head, slot)
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#attesting
# Milliseconds to wait from the start of the slot before sending out
# attestations
const attestationOffset = SECONDS_PER_SLOT.int64 * 1000 div 3
let
# The latest point in time when we'll be sending out attestations
attestationCutoffTime = slot.toBeaconTime(millis(attestationOffset))
attestationCutoff = node.beaconClock.fromNow(attestationCutoffTime)
if attestationCutoff.inFuture:
debug "Waiting to send attestations",
head = shortLog(head),
attestationCutoff = shortLog(attestationCutoff.offset)
# Wait either for the block or the attestation cutoff time to arrive
if await node.consensusManager[].expectBlock(slot).withTimeout(attestationCutoff.offset):
# The expected block arrived (or expectBlock was called again which
# shouldn't happen as this is the only place we use it) - in our async
# loop however, we might have been doing other processing that caused delays
# here so we'll cap the waiting to the time when we would have sent out
# attestations had the block not arrived.
# An opposite case is that we received (or produced) a block that has
# not yet reached our neighbours. To protect against our attestations
# being dropped (because the others have not yet seen the block), we'll
# impose a minimum delay of 1000ms. The delay is enforced only when we're
# not hitting the "normal" cutoff time for sending out attestations.
# An earlier delay of 250ms has proven to be not enough, increasing the
# risk of losing attestations.
# Regardless, because we "just" received the block, we'll impose the
# delay.
const afterBlockDelay = 1000
let
afterBlockTime = node.beaconClock.now() + millis(afterBlockDelay)
afterBlockCutoff = node.beaconClock.fromNow(
min(afterBlockTime, attestationCutoffTime + millis(afterBlockDelay)))
if afterBlockCutoff.inFuture:
debug "Got block, waiting to send attestations",
head = shortLog(head),
afterBlockCutoff = shortLog(afterBlockCutoff.offset)
await sleepAsync(afterBlockCutoff.offset)
# Time passed - we might need to select a new head in that case
node.consensusManager[].updateHead(slot)
head = node.dag.head
handleAttestations(node, head, slot)
handleSyncCommitteeMessages(node, head, slot)
2020-12-16 13:03:04 +00:00
updateValidatorMetrics(node) # the important stuff is done, update the vanity numbers
2020-11-27 23:34:25 +00:00
# https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/validator.md#broadcast-aggregate
# If the validator is selected to aggregate (is_aggregator), then they
# broadcast their best aggregate as a SignedAggregateAndProof to the global
# aggregate channel (beacon_aggregate_and_proof) two-thirds of the way
# through the slot-that is, SECONDS_PER_SLOT * 2 / 3 seconds after the start
# of slot.
if slot > 2:
let
aggregateWaitTime = node.beaconClock.fromNow(
slot.toBeaconTime(seconds(int64(SECONDS_PER_SLOT * 2) div 3)))
if aggregateWaitTime.inFuture:
debug "Waiting to send aggregate attestations",
aggregateWaitTime = shortLog(aggregateWaitTime.offset)
await sleepAsync(aggregateWaitTime.offset)
let sendAggregatedAttestationsFut =
sendAggregatedAttestations(node, head, slot)
let handleSyncCommitteeContributionsFut =
handleSyncCommitteeContributions(node, head, slot)
await handleSyncCommitteeContributionsFut
await sendAggregatedAttestationsFut
if node.eth1Monitor != nil and (slot mod SLOTS_PER_EPOCH) == 0:
let finalizedEpochRef = node.dag.getFinalizedEpochRef()
discard node.eth1Monitor.trackFinalizedState(
finalizedEpochRef.eth1_data, finalizedEpochRef.eth1_deposit_index)
proc sendAttestation*(node: BeaconNode,
attestation: Attestation): Future[SendResult] {.async.} =
# REST/JSON-RPC API helper procedure.
let attestationBlock =
block:
let res = node.dag.getRef(attestation.data.beacon_block_root)
if isNil(res):
debug "Attempt to send attestation without corresponding block",
attestation = shortLog(attestation)
return SendResult.err(
"Attempt to send attestation without corresponding block")
res
let
epochRef = node.dag.getEpochRef(
attestationBlock, attestation.data.target.epoch)
subnet_id = compute_subnet_for_attestation(
get_committee_count_per_slot(epochRef), attestation.data.slot,
attestation.data.index.CommitteeIndex)
res = await node.sendAttestation(attestation, subnet_id,
checkSignature = true)
if not res.isOk():
return res
let
wallTime = node.processor.getCurrentBeaconTime()
deadline = attestation.data.slot.toBeaconTime() +
seconds(int(SECONDS_PER_SLOT div 3))
(delayStr, delaySecs) =
if wallTime < deadline:
("-" & $(deadline - wallTime), -toFloatSeconds(deadline - wallTime))
else:
($(wallTime - deadline), toFloatSeconds(wallTime - deadline))
notice "Attestation sent",
attestation = shortLog(attestation), delay = delayStr, subnet_id
beacon_attestation_sent_delay.observe(delaySecs)
return SendResult.ok()
proc sendAggregateAndProof*(node: BeaconNode,
proof: SignedAggregateAndProof): Future[SendResult] {.
async.} =
# REST/JSON-RPC API helper procedure.
let res = await node.processor.aggregateValidator(proof)
return
if res.isOk():
node.network.broadcastAggregateAndProof(proof)
notice "Aggregated attestation sent",
attestation = shortLog(proof.message.aggregate),
aggregator_index = proof.message.aggregator_index,
signature = shortLog(proof.signature)
ok()
else:
notice "Aggregate and proof failed validation",
proof = shortLog(proof.message.aggregate), error = res.error()
err(res.error()[1])
proc sendVoluntaryExit*(node: BeaconNode,
exit: SignedVoluntaryExit): SendResult =
# REST/JSON-RPC API helper procedure.
let res = node.processor[].voluntaryExitValidator(exit)
if res.isOk():
node.network.broadcastVoluntaryExit(exit)
ok()
else:
notice "Voluntary exit request failed validation",
exit = shortLog(exit.message), error = res.error()
err(res.error()[1])
proc sendAttesterSlashing*(node: BeaconNode,
slashing: AttesterSlashing): SendResult =
# REST/JSON-RPC API helper procedure.
let res = node.processor[].attesterSlashingValidator(slashing)
if res.isOk():
node.network.broadcastAttesterSlashing(slashing)
ok()
else:
notice "Attester slashing request failed validation",
slashing = shortLog(slashing), error = res.error()
err(res.error()[1])
proc sendProposerSlashing*(node: BeaconNode,
slashing: ProposerSlashing): SendResult =
# REST/JSON-RPC API helper procedure.
let res = node.processor[].proposerSlashingValidator(slashing)
if res.isOk():
node.network.broadcastProposerSlashing(slashing)
ok()
else:
notice "Proposer slashing request failed validation",
slashing = shortLog(slashing), error = res.error()
err(res.error()[1])
proc sendBeaconBlock*(node: BeaconNode, forked: ForkedSignedBeaconBlock
): Future[SendBlockResult] {.async.} =
# REST/JSON-RPC API helper procedure.
let head = node.dag.head
if not(node.isSynced(head)):
return SendBlockResult.err("Beacon node is currently syncing")
if head.slot >= forked.slot():
node.network.broadcastBeaconBlock(forked)
return SendBlockResult.ok(false)
let res = await node.proposeSignedBlock(head, AttachedValidator(), forked)
if res == head:
# `res == head` means failure, in such case we need to broadcast block
# manually because of the specification.
node.network.broadcastBeaconBlock(forked)
return SendBlockResult.ok(false)
return SendBlockResult.ok(true)
proc registerDuty*(
node: BeaconNode, slot: Slot, subnet_id: SubnetId, vidx: ValidatorIndex,
isAggregator: bool) =
# Only register relevant duties
node.actionTracker.registerDuty(slot, subnet_id, vidx, isAggregator)
proc registerDuties*(node: BeaconNode, wallSlot: Slot) {.async.} =
## Register upcoming duties of attached validators with the duty tracker
if node.attachedValidators[].count() == 0 or not node.isSynced(node.dag.head):
# Nothing to do because we have no validator attached
return
let
genesis_validators_root =
getStateField(node.dag.headState.data, genesis_validators_root)
head = node.dag.head
# Getting the slot signature is expensive but cached - in "normal" cases we'll
# be getting the duties one slot at a time
for slot in wallSlot ..< wallSlot + SUBNET_SUBSCRIPTION_LEAD_TIME_SLOTS:
let
epochRef = node.dag.getEpochRef(head, slot.epoch)
fork = node.dag.forkAtEpoch(slot.epoch)
committees_per_slot = get_committee_count_per_slot(epochRef)
for committee_index in 0'u64..<committees_per_slot:
let committee = get_beacon_committee(
epochRef, slot, committee_index.CommitteeIndex)
for index_in_committee, validatorIdx in committee:
let validator = node.getAttachedValidator(epochRef, validatorIdx)
if validator != nil:
let
subnet_id = compute_subnet_for_attestation(
committees_per_slot, slot, committee_index.CommitteeIndex)
slotSig = await getSlotSig(
validator, fork, genesis_validators_root, slot)
isAggregator = is_aggregator(committee.lenu64, slotSig)
node.registerDuty(slot, subnet_id, validatorIdx, isAggregator)