474 lines
16 KiB
Nim
474 lines
16 KiB
Nim
# beacon_chain
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# Copyright (c) 2022-2023 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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when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import chronos, chronicles, stew/base10
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import
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eth/p2p/discoveryv5/random2,
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../networking/eth2_network,
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../beacon_clock,
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"."/sync_protocol, "."/sync_manager
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export sync_manager
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logScope:
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topics = "lcman"
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type
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Nothing = object
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ResponseError = object of CatchableError
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Endpoint[K, V] =
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(K, V) # https://github.com/nim-lang/Nim/issues/19531
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Bootstrap =
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Endpoint[Eth2Digest, ForkedLightClientBootstrap]
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UpdatesByRange =
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Endpoint[Slice[SyncCommitteePeriod], ForkedLightClientUpdate]
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FinalityUpdate =
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Endpoint[Nothing, ForkedLightClientFinalityUpdate]
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OptimisticUpdate =
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Endpoint[Nothing, ForkedLightClientOptimisticUpdate]
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ValueVerifier[V] =
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proc(v: V): Future[Result[void, VerifierError]] {.gcsafe, raises: [Defect].}
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BootstrapVerifier* =
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ValueVerifier[ForkedLightClientBootstrap]
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UpdateVerifier* =
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ValueVerifier[ForkedLightClientUpdate]
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FinalityUpdateVerifier* =
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ValueVerifier[ForkedLightClientFinalityUpdate]
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OptimisticUpdateVerifier* =
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ValueVerifier[ForkedLightClientOptimisticUpdate]
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GetTrustedBlockRootCallback* =
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proc(): Option[Eth2Digest] {.gcsafe, raises: [Defect].}
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GetBoolCallback* =
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proc(): bool {.gcsafe, raises: [Defect].}
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GetSyncCommitteePeriodCallback* =
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proc(): SyncCommitteePeriod {.gcsafe, raises: [Defect].}
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LightClientManager* = object
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network: Eth2Node
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rng: ref HmacDrbgContext
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getTrustedBlockRoot: GetTrustedBlockRootCallback
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bootstrapVerifier: BootstrapVerifier
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updateVerifier: UpdateVerifier
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finalityUpdateVerifier: FinalityUpdateVerifier
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optimisticUpdateVerifier: OptimisticUpdateVerifier
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isLightClientStoreInitialized: GetBoolCallback
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isNextSyncCommitteeKnown: GetBoolCallback
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getFinalizedPeriod: GetSyncCommitteePeriodCallback
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getOptimisticPeriod: GetSyncCommitteePeriodCallback
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getBeaconTime: GetBeaconTimeFn
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loopFuture: Future[void]
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func init*(
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T: type LightClientManager,
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network: Eth2Node,
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rng: ref HmacDrbgContext,
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getTrustedBlockRoot: GetTrustedBlockRootCallback,
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bootstrapVerifier: BootstrapVerifier,
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updateVerifier: UpdateVerifier,
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finalityUpdateVerifier: FinalityUpdateVerifier,
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optimisticUpdateVerifier: OptimisticUpdateVerifier,
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isLightClientStoreInitialized: GetBoolCallback,
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isNextSyncCommitteeKnown: GetBoolCallback,
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getFinalizedPeriod: GetSyncCommitteePeriodCallback,
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getOptimisticPeriod: GetSyncCommitteePeriodCallback,
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getBeaconTime: GetBeaconTimeFn
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): LightClientManager =
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## Initialize light client manager.
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LightClientManager(
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network: network,
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rng: rng,
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getTrustedBlockRoot: getTrustedBlockRoot,
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bootstrapVerifier: bootstrapVerifier,
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updateVerifier: updateVerifier,
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finalityUpdateVerifier: finalityUpdateVerifier,
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optimisticUpdateVerifier: optimisticUpdateVerifier,
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isLightClientStoreInitialized: isLightClientStoreInitialized,
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isNextSyncCommitteeKnown: isNextSyncCommitteeKnown,
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getFinalizedPeriod: getFinalizedPeriod,
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getOptimisticPeriod: getOptimisticPeriod,
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getBeaconTime: getBeaconTime
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)
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proc isGossipSupported*(
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self: LightClientManager,
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period: SyncCommitteePeriod
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): bool =
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## Indicate whether the light client is sufficiently synced to accept gossip.
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if not self.isLightClientStoreInitialized():
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return false
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let
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finalizedPeriod = self.getFinalizedPeriod()
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isNextSyncCommitteeKnown = self.isNextSyncCommitteeKnown()
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if isNextSyncCommitteeKnown:
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period <= finalizedPeriod + 1
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else:
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period <= finalizedPeriod
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.0/specs/altair/light-client/p2p-interface.md#getlightclientbootstrap
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proc doRequest(
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e: typedesc[Bootstrap],
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peer: Peer,
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blockRoot: Eth2Digest
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): Future[NetRes[ForkedLightClientBootstrap]] {.
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raises: [Defect, IOError].} =
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peer.lightClientBootstrap(blockRoot)
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-alpha.0/specs/altair/light-client/p2p-interface.md#lightclientupdatesbyrange
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type LightClientUpdatesByRangeResponse =
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NetRes[List[ForkedLightClientUpdate, MAX_REQUEST_LIGHT_CLIENT_UPDATES]]
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proc doRequest(
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e: typedesc[UpdatesByRange],
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peer: Peer,
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periods: Slice[SyncCommitteePeriod]
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): Future[LightClientUpdatesByRangeResponse] {.
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async, raises: [Defect, IOError].} =
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let
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startPeriod = periods.a
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lastPeriod = periods.b
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reqCount = min(periods.len, MAX_REQUEST_LIGHT_CLIENT_UPDATES).uint64
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let response = await peer.lightClientUpdatesByRange(startPeriod, reqCount)
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if response.isOk:
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if response.get.lenu64 > reqCount:
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raise newException(ResponseError, "Too many values in response" &
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" (" & Base10.toString(response.get.lenu64) &
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" > " & Base10.toString(reqCount.uint) & ")")
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var expectedPeriod = startPeriod
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for update in response.get:
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withForkyUpdate(update):
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when lcDataFork > LightClientDataFork.None:
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let
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attPeriod =
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forkyUpdate.attested_header.beacon.slot.sync_committee_period
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sigPeriod = forkyUpdate.signature_slot.sync_committee_period
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if attPeriod != sigPeriod:
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raise newException(
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ResponseError, "Conflicting sync committee periods" &
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" (signature: " & Base10.toString(distinctBase(sigPeriod)) &
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" != " & Base10.toString(distinctBase(attPeriod)) & ")")
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if attPeriod < expectedPeriod:
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raise newException(
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ResponseError, "Unexpected sync committee period" &
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" (" & Base10.toString(distinctBase(attPeriod)) &
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" < " & Base10.toString(distinctBase(expectedPeriod)) & ")")
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if attPeriod > expectedPeriod:
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if attPeriod > lastPeriod:
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raise newException(
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ResponseError, "Sync committee period too high" &
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" (" & Base10.toString(distinctBase(attPeriod)) &
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" > " & Base10.toString(distinctBase(lastPeriod)) & ")")
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expectedPeriod = attPeriod
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inc expectedPeriod
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else:
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raise newException(ResponseError, "Invalid context bytes")
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return response
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.0/specs/altair/light-client/p2p-interface.md#getlightclientfinalityupdate
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proc doRequest(
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e: typedesc[FinalityUpdate],
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peer: Peer
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): Future[NetRes[ForkedLightClientFinalityUpdate]] {.
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raises: [Defect, IOError].} =
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peer.lightClientFinalityUpdate()
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.0/specs/altair/light-client/p2p-interface.md#getlightclientoptimisticupdate
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proc doRequest(
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e: typedesc[OptimisticUpdate],
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peer: Peer
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): Future[NetRes[ForkedLightClientOptimisticUpdate]] {.
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raises: [Defect, IOError].} =
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peer.lightClientOptimisticUpdate()
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template valueVerifier[E](
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self: LightClientManager,
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e: typedesc[E]
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): ValueVerifier[E.V] =
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when E.V is ForkedLightClientBootstrap:
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self.bootstrapVerifier
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elif E.V is ForkedLightClientUpdate:
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self.updateVerifier
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elif E.V is ForkedLightClientFinalityUpdate:
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self.finalityUpdateVerifier
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elif E.V is ForkedLightClientOptimisticUpdate:
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self.optimisticUpdateVerifier
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else: static: doAssert false
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iterator values(v: auto): auto =
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## Local helper for `workerTask` to share the same implementation for both
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## scalar and aggregate values, by treating scalars as 1-length aggregates.
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when v is List:
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for i in v:
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yield i
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else:
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yield v
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proc workerTask[E](
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self: LightClientManager,
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e: typedesc[E],
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key: E.K
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): Future[bool] {.async.} =
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var
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peer: Peer
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didProgress = false
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try:
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peer = self.network.peerPool.acquireNoWait()
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let value =
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when E.K is Nothing:
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await E.doRequest(peer)
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else:
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await E.doRequest(peer, key)
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if value.isOk:
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var applyReward = false
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for val in value.get().values:
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let res = await self.valueVerifier(E)(val)
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if res.isErr:
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case res.error
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of VerifierError.MissingParent:
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# Stop, requires different request to progress
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return didProgress
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of VerifierError.Duplicate:
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# Ignore, a concurrent request may have already fulfilled this
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when E.V is ForkedLightClientBootstrap:
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didProgress = true
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else:
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discard
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of VerifierError.UnviableFork:
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# Descore, peer is on an incompatible fork version
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withForkyObject(val):
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when lcDataFork > LightClientDataFork.None:
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notice "Received value from an unviable fork",
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value = forkyObject,
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endpoint = E.name, peer, peer_score = peer.getScore()
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else:
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notice "Received value from an unviable fork",
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endpoint = E.name, peer, peer_score = peer.getScore()
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peer.updateScore(PeerScoreUnviableFork)
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return didProgress
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of VerifierError.Invalid:
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# Descore, received data is malformed
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withForkyObject(val):
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when lcDataFork > LightClientDataFork.None:
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warn "Received invalid value", value = forkyObject.shortLog,
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endpoint = E.name, peer, peer_score = peer.getScore()
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else:
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warn "Received invalid value",
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endpoint = E.name, peer, peer_score = peer.getScore()
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peer.updateScore(PeerScoreBadValues)
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return didProgress
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else:
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# Reward, peer returned something useful
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applyReward = true
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didProgress = true
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if applyReward:
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peer.updateScore(PeerScoreGoodValues)
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else:
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peer.updateScore(PeerScoreNoValues)
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debug "Failed to receive value on request", value,
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endpoint = E.name, peer, peer_score = peer.getScore()
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except ResponseError as exc:
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warn "Received invalid response", error = exc.msg,
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endpoint = E.name, peer, peer_score = peer.getScore()
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peer.updateScore(PeerScoreBadValues)
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except CancelledError as exc:
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raise exc
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except PeerPoolError as exc:
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debug "Failed to acquire peer", exc = exc.msg
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except CatchableError as exc:
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if peer != nil:
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peer.updateScore(PeerScoreNoValues)
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debug "Unexpected exception while receiving value", exc = exc.msg,
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endpoint = E.name, peer, peer_score = peer.getScore()
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raise exc
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finally:
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if peer != nil:
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self.network.peerPool.release(peer)
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return didProgress
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proc query[E](
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self: LightClientManager,
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e: typedesc[E],
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key: E.K
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): Future[bool] {.async.} =
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const PARALLEL_REQUESTS = 2
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var workers: array[PARALLEL_REQUESTS, Future[bool]]
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let
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progressFut = newFuture[void]("lcmanProgress")
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doneFut = newFuture[void]("lcmanDone")
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var
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numCompleted = 0
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maxCompleted = workers.len
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proc handleFinishedWorker(future: pointer) =
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try:
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let didProgress = cast[Future[bool]](future).read()
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if didProgress and not progressFut.finished:
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progressFut.complete()
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except CancelledError as exc:
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if not progressFut.finished:
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progressFut.cancel()
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except CatchableError as exc:
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discard
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finally:
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inc numCompleted
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if numCompleted == maxCompleted:
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doneFut.complete()
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try:
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# Start concurrent workers
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for i in 0 ..< workers.len:
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try:
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workers[i] = self.workerTask(e, key)
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workers[i].addCallback(handleFinishedWorker)
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except CancelledError as exc:
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raise exc
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except CatchableError as exc:
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workers[i] = newFuture[bool]()
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workers[i].complete(false)
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# Wait for any worker to report progress, or for all workers to finish
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discard await race(progressFut, doneFut)
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finally:
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for i in 0 ..< maxCompleted:
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if workers[i] == nil:
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maxCompleted = i
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if numCompleted == maxCompleted:
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doneFut.complete()
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break
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if not workers[i].finished:
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workers[i].cancel()
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while true:
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try:
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await allFutures(workers[0 ..< maxCompleted])
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break
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except CancelledError as exc:
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continue
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while true:
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try:
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await doneFut
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break
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except CancelledError as exc:
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continue
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if not progressFut.finished:
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progressFut.cancel()
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return progressFut.completed
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template query(
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self: LightClientManager,
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e: typedesc[UpdatesByRange],
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key: SyncCommitteePeriod
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): Future[bool] =
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self.query(e, key .. key)
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template query[E](
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self: LightClientManager,
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e: typedesc[E]
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): Future[bool] =
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self.query(e, Nothing())
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type SchedulingMode = enum
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Soon,
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CurrentPeriod,
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NextPeriod
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func fetchTime(
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self: LightClientManager,
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wallTime: BeaconTime,
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schedulingMode: SchedulingMode
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): BeaconTime =
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let
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remainingTime =
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case schedulingMode:
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of Soon:
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chronos.seconds(0)
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of CurrentPeriod:
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let
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wallPeriod = wallTime.slotOrZero().sync_committee_period
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deadlineSlot = (wallPeriod + 1).start_slot - 1
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deadline = deadlineSlot.start_beacon_time()
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chronos.nanoseconds((deadline - wallTime).nanoseconds)
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of NextPeriod:
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chronos.seconds(
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(SLOTS_PER_SYNC_COMMITTEE_PERIOD * SECONDS_PER_SLOT).int64)
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minDelay = max(remainingTime div 8, chronos.seconds(10))
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jitterSeconds = (minDelay * 2).seconds
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jitterDelay = chronos.seconds(self.rng[].rand(jitterSeconds).int64)
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return wallTime + minDelay + jitterDelay
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# https://github.com/ethereum/consensus-specs/blob/v1.3.0-rc.0/specs/altair/light-client/light-client.md#light-client-sync-process
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proc loop(self: LightClientManager) {.async.} =
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var nextFetchTime = self.getBeaconTime()
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while true:
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# Periodically wake and check for changes
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let wallTime = self.getBeaconTime()
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if wallTime < nextFetchTime or
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self.network.peerPool.lenAvailable < 1:
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await sleepAsync(chronos.seconds(2))
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continue
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# Obtain bootstrap data once a trusted block root is supplied
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if not self.isLightClientStoreInitialized():
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let trustedBlockRoot = self.getTrustedBlockRoot()
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if trustedBlockRoot.isNone:
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await sleepAsync(chronos.seconds(2))
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continue
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let didProgress = await self.query(Bootstrap, trustedBlockRoot.get)
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if not didProgress:
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nextFetchTime = self.fetchTime(wallTime, Soon)
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continue
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# Fetch updates
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var allowWaitNextPeriod = false
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let
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finalized = self.getFinalizedPeriod()
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optimistic = self.getOptimisticPeriod()
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current = wallTime.slotOrZero().sync_committee_period
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isNextSyncCommitteeKnown = self.isNextSyncCommitteeKnown()
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didProgress =
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if finalized == optimistic and not isNextSyncCommitteeKnown:
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if finalized >= current:
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await self.query(UpdatesByRange, finalized)
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else:
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await self.query(UpdatesByRange, finalized ..< current)
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elif finalized + 1 < current:
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await self.query(UpdatesByRange, finalized + 1 ..< current)
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elif finalized != optimistic:
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await self.query(FinalityUpdate)
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else:
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allowWaitNextPeriod = true
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await self.query(OptimisticUpdate)
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schedulingMode =
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if not didProgress or not self.isGossipSupported(current):
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Soon
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elif not allowWaitNextPeriod:
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CurrentPeriod
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else:
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NextPeriod
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nextFetchTime = self.fetchTime(wallTime, schedulingMode)
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proc start*(self: var LightClientManager) =
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## Start light client manager's loop.
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doAssert self.loopFuture == nil
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self.loopFuture = self.loop()
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proc stop*(self: var LightClientManager) {.async.} =
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## Stop light client manager's loop.
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if self.loopFuture != nil:
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await self.loopFuture.cancelAndWait()
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self.loopFuture = nil
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