219 lines
8.6 KiB
Nim
219 lines
8.6 KiB
Nim
# beacon_chain
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# Copyright (c) 2018-2020 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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import
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# Standard library
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os, strutils, json, times,
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# Nimble packages
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stew/shims/[tables, macros],
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chronos, confutils, metrics, json_rpc/[rpcclient, jsonmarshal],
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chronicles,
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blscurve, json_serialization/std/[options, sets, net],
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# Local modules
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spec/[datatypes, digest, crypto, helpers, network],
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conf, time,
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eth2_network, eth2_discovery, validator_pool, beacon_node_types,
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nimbus_binary_common,
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version, ssz/merkleization,
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sync_manager, keystore_management,
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spec/eth2_apis/validator_callsigs_types,
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eth2_json_rpc_serialization
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logScope: topics = "vc"
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template sourceDir: string = currentSourcePath.rsplit(DirSep, 1)[0]
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## Generate client convenience marshalling wrappers from forward declarations
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createRpcSigs(RpcClient, sourceDir / "spec" / "eth2_apis" / "validator_callsigs.nim")
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type
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ValidatorClient = ref object
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config: ValidatorClientConf
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client: RpcHttpClient
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beaconClock: BeaconClock
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attachedValidators: ValidatorPool
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fork: Fork
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proposalsForEpoch: Table[Slot, ValidatorPubKey]
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attestationsForEpoch: Table[Slot, seq[AttesterDuties]]
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beaconGenesis: BeaconGenesisTuple
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proc getValidatorDutiesForEpoch(vc: ValidatorClient, epoch: Epoch) {.gcsafe, async.} =
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let proposals = await vc.client.get_v1_validator_duties_proposer(epoch)
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# update the block proposal duties this VC should do during this epoch
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vc.proposalsForEpoch.clear()
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for curr in proposals:
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if vc.attachedValidators.validators.contains curr.public_key:
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vc.proposalsForEpoch.add(curr.slot, curr.public_key)
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# couldn't use mapIt in ANY shape or form so reverting to raw loops - sorry Sean Parent :|
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var validatorPubkeys: seq[ValidatorPubKey]
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for key in vc.attachedValidators.validators.keys:
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validatorPubkeys.add key
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# update the attestation duties this VC should do during this epoch
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let attestations = await vc.client.post_v1_validator_duties_attester(
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epoch, validatorPubkeys)
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vc.attestationsForEpoch.clear()
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for a in attestations:
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if vc.attestationsForEpoch.hasKeyOrPut(a.slot, @[a]):
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vc.attestationsForEpoch[a.slot].add(a)
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# for now we will get the fork each time we update the validator duties for each epoch
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vc.fork = await vc.client.get_v1_beacon_states_fork("head")
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proc onSlotStart(vc: ValidatorClient, lastSlot, scheduledSlot: Slot) {.gcsafe, async.} =
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let
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# The slot we should be at, according to the clock
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beaconTime = vc.beaconClock.now()
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wallSlot = beaconTime.toSlot()
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let
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slot = wallSlot.slot # afterGenesis == true!
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nextSlot = slot + 1
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info "Slot start",
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lastSlot = shortLog(lastSlot),
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scheduledSlot = shortLog(scheduledSlot),
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beaconTime = shortLog(beaconTime),
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portBN = vc.config.rpcPort,
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cat = "scheduling"
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try:
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# at the start of each epoch - request all validator duties
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# TODO perhaps call this not on the first slot of each Epoch but perhaps
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# 1 slot earlier because there are a few back-and-forth requests which
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# could take up time for attesting... Perhaps this should be called more
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# than once per epoch because of forks & other events...
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if slot.isEpoch:
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await getValidatorDutiesForEpoch(vc, slot.compute_epoch_at_slot)
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# check if we have a validator which needs to propose on this slot
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if vc.proposalsForEpoch.contains slot:
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let public_key = vc.proposalsForEpoch[slot]
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let validator = vc.attachedValidators.validators[public_key]
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let randao_reveal = validator.genRandaoReveal(
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vc.fork, vc.beaconGenesis.genesis_validators_root, slot)
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var newBlock = SignedBeaconBlock(
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message: await vc.client.get_v1_validator_blocks(slot, Eth2Digest(), randao_reveal)
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)
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let blockRoot = hash_tree_root(newBlock.message)
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newBlock.signature = await validator.signBlockProposal(
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vc.fork, vc.beaconGenesis.genesis_validators_root, slot, blockRoot)
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discard await vc.client.post_v1_beacon_blocks(newBlock)
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# https://github.com/ethereum/eth2.0-specs/blob/v0.11.1/specs/phase0/validator.md#attesting
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# A validator should create and broadcast the attestation to the associated
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# attestation subnet when either (a) the validator has received a valid
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# block from the expected block proposer for the assigned slot or
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# (b) one-third of the slot has transpired (`SECONDS_PER_SLOT / 3` seconds
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# after the start of slot) -- whichever comes first.
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discard await vc.beaconClock.sleepToSlotOffset(
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seconds(int64(SECONDS_PER_SLOT)) div 3, slot, "Waiting to send attestations")
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# check if we have validators which need to attest on this slot
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if vc.attestationsForEpoch.contains slot:
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for a in vc.attestationsForEpoch[slot]:
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let validator = vc.attachedValidators.validators[a.public_key]
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let ad = await vc.client.get_v1_validator_attestation_data(slot, a.committee_index)
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# TODO I don't like these (u)int64-to-int conversions...
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let attestation = await validator.produceAndSignAttestation(
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ad, a.committee_length.int, a.validator_committee_index.int,
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vc.fork, vc.beaconGenesis.genesis_validators_root)
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discard await vc.client.post_v1_beacon_pool_attestations(attestation)
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except CatchableError as err:
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error "Caught an unexpected error", err = err.msg
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let
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nextSlotStart = saturate(vc.beaconClock.fromNow(nextSlot))
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info "Slot end",
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slot = shortLog(slot),
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nextSlot = shortLog(nextSlot),
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portBN = vc.config.rpcPort,
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cat = "scheduling"
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when declared(GC_fullCollect):
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# The slots in the validator client work as frames in a game: we want to make
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# sure that we're ready for the next one and don't get stuck in lengthy
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# garbage collection tasks when time is of essence in the middle of a slot -
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# while this does not guarantee that we'll never collect during a slot, it
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# makes sure that all the scratch space we used during slot tasks (logging,
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# temporary buffers etc) gets recycled for the next slot that is likely to
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# need similar amounts of memory.
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GC_fullCollect()
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addTimer(nextSlotStart) do (p: pointer):
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asyncCheck vc.onSlotStart(slot, nextSlot)
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programMain:
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let config = makeBannerAndConfig("Nimbus validator client v" & fullVersionStr, ValidatorClientConf)
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setupMainProc(config.logLevel)
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# TODO figure out how to re-enable this without the VCs continuing
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# to run when `make eth2_network_simulation` is killed with CTRL+C
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#ctrlCHandling: discard
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case config.cmd
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of VCNoCommand:
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debug "Launching validator client",
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version = fullVersionStr,
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cmdParams = commandLineParams(),
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config
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var vc = ValidatorClient(
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config: config,
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client: newRpcHttpClient(),
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attachedValidators: ValidatorPool.init()
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)
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vc.proposalsForEpoch.init()
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vc.attestationsForEpoch.init()
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# load all the validators from the data dir into memory
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for curr in vc.config.validatorKeys:
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vc.attachedValidators.addLocalValidator(curr.toPubKey, curr)
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# TODO perhaps we should handle the case if the BN is down and try to connect to it
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# untill success, and also later on disconnets we should continue trying to reconnect
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waitFor vc.client.connect("localhost", Port(config.rpcPort)) # TODO: use config.rpcAddress
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info "Connected to beacon node", port = config.rpcPort
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# init the beacon clock
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vc.beaconGenesis = waitFor vc.client.get_v1_beacon_genesis()
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vc.beaconClock = BeaconClock.init(vc.beaconGenesis.genesis_time)
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let
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curSlot = vc.beaconClock.now().slotOrZero()
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nextSlot = curSlot + 1 # No earlier than GENESIS_SLOT + 1
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fromNow = saturate(vc.beaconClock.fromNow(nextSlot))
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# onSlotStart() requests the validator duties only on the start of each epoch
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# so we should request the duties here when the VC binary boots up in order
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# to handle the case when in the middle of an epoch. Also for the genesis slot.
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waitFor vc.getValidatorDutiesForEpoch(curSlot.compute_epoch_at_slot)
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info "Scheduling first slot action",
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beaconTime = shortLog(vc.beaconClock.now()),
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nextSlot = shortLog(nextSlot),
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fromNow = shortLog(fromNow),
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cat = "scheduling"
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addTimer(fromNow) do (p: pointer) {.gcsafe.}:
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asyncCheck vc.onSlotStart(curSlot, nextSlot)
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runForever()
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