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move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
# beacon_chain
verify `genesis_time` more strictly (fixes #1667) (#5694) Bogus values lead to crashes down the line when timers overflow
2024-01-06 14:26:56 +00:00
# Copyright (c) 2018-2024 Status Research & Development GmbH
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
# 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.
{.used.}
import
remove unused imports in tests/ (#3713)
2022-06-07 17:05:06 +00:00
chronos,
remove most std/options imports (#4778)
2023-03-31 20:46:47 +00:00
std/sequtils,
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
unittest2,
reduce `nim-eth` dependencies just for RNG (#5099) We have several modules that import `nim-eth` for the sole purpose of its `keys.newRng` function. This function is meanwhile a simple wrapper around `nim-bearssl`'s `HmacDrbgContext.new()`, so the import doesn't really serve a use anymore. Replace `keys.newRng` with the direct call to reduce `nim-eth` imports.
2023-06-19 22:43:50 +00:00
taskpools,
EIP-4788/parentBeaconBlockRoot fixes (#5318)
2023-08-19 08:38:17 +00:00
../beacon_chain/conf,
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
../beacon_chain/spec/[beaconstate, forks, helpers, state_transition],
5 more modules of eip4844.foo to deneb.foo renames (#4698)
2023-03-06 18:45:52 +00:00
../beacon_chain/spec/datatypes/deneb,
move consensus_manager to consensus_object_pools (#3852)
2022-07-13 14:13:54 +00:00
../beacon_chain/gossip_processing/block_processor,
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
../beacon_chain/consensus_object_pools/[
Quarantine and reassembly of gossiped blobs and blocks (#4808)
2023-04-13 19:11:40 +00:00
attestation_pool, blockchain_dag, blob_quarantine, block_quarantine,
block_clearance, consensus_manager],
Rename eth1/ -> el/ and eth1_monitor.nim -> el_monitor.nim (#4944)
2023-05-15 05:05:12 +00:00
../beacon_chain/el/el_manager,
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
./testutil, ./testdbutil, ./testblockutil
remove `newPayload` from block production flow (#4186) * remove `newPayload` from block production flow * refactor block_processor to run `newPayload` as part of `storeBlock`
2022-10-14 19:48:56 +00:00
from chronos/unittest2/asynctests import asyncTest
allow execution clients several seconds to construct blocks (#4012)
2022-08-23 16:19:52 +00:00
from ../beacon_chain/spec/eth2_apis/dynamic_fee_recipients import
DynamicFeeRecipientsStore, init
more efficient forkchoiceUpdated usage (#4055) * more efficient forkchoiceUpdated usage * await rather than asyncSpawn; ensure head update before dag.updateHead * use action tracker rather than attached validators to check for next slot proposal; use wall slot + 1 rather than state slot + 1 to correctly check when missing blocks * re-add two-fcU case for when newPayload not VALID * check dynamicFeeRecipientsStore for potential proposal * remove duplicate checks for whether next proposer
2022-09-07 18:34:52 +00:00
from ../beacon_chain/validators/action_tracker import ActionTracker
allow execution clients several seconds to construct blocks (#4012)
2022-08-23 16:19:52 +00:00
from ../beacon_chain/validators/keystore_management import KeymanagerHost
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
proc pruneAtFinalization(dag: ChainDAGRef) =
if dag.needStateCachesAndForkChoicePruning():
dag.pruneStateCachesDAG()
suite "Block processor" & preset():
setup:
reduce `nim-eth` dependencies just for RNG (#5099) We have several modules that import `nim-eth` for the sole purpose of its `keys.newRng` function. This function is meanwhile a simple wrapper around `nim-bearssl`'s `HmacDrbgContext.new()`, so the import doesn't really serve a use anymore. Replace `keys.newRng` with the direct call to reduce `nim-eth` imports.
2023-06-19 22:43:50 +00:00
let rng = HmacDrbgContext.new()
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
var
db = makeTestDB(SLOTS_PER_EPOCH)
Validator monitoring (#2925) Validator monitoring based on and mostly compatible with the implementation in Lighthouse - tracks additional logs and metrics for specified validators so as to stay on top on performance. The implementation works more or less the following way: * Validator pubkeys are singled out for monitoring - these can be running on the node or not * For every action that the validator takes, we record steps in the process such as messages being seen on the network or published in the API * When the dust settles at the end of an epoch, we report the information from one epoch before that, which coincides with the balances being updated - this is a tradeoff between being correct (waiting for finalization) and providing relevant information in a timely manner)
2021-12-20 19:20:31 +00:00
validatorMonitor = newClone(ValidatorMonitor.init())
dag = init(ChainDAGRef, defaultRuntimeConfig, db, validatorMonitor, {})
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
taskpool = Taskpool.new()
async batch verification (+40% sig verification throughput) (#5176) * async batch verification When batch verification is done, the main thread is blocked reducing concurrency. With this PR, the new thread signalling primitive in chronos is used to offload the full batch verification process to a separate thread allowing the main threads to continue async operations while the other threads verify signatures. Similar to previous behavior, the number of ongoing batch verifications is capped to prevent runaway resource usage. In addition to the asynchronous processing, 3 addition changes help drive throughput: * A loop is used for batch accumulation: this prevents a stampede of small batches in eager mode where both the eager and the scheduled batch runner would pick batches off the queue, prematurely picking "fresh" batches off the queue * An additional small wait is introduced for small batches - this helps create slightly larger batches which make better used of the increased concurrency * Up to 2 batches are scheduled to the threadpool during high pressure, reducing startup latency for the threads Together, these changes increase attestation verification throughput under load up to 30%. * fixup * Update submodules * fix blst build issues (and a PIC warning) * bump --------- Co-authored-by: Zahary Karadjov <zahary@gmail.com>
2023-08-03 08:36:45 +00:00
verifier = BatchVerifier.init(rng, taskpool)
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
quarantine = newClone(Quarantine.init())
Quarantine and reassembly of gossiped blobs and blocks (#4808)
2023-04-13 19:11:40 +00:00
blobQuarantine = newClone(BlobQuarantine())
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
attestationPool = newClone(AttestationPool.init(dag, quarantine))
Support for driving multiple EL nodes from a single Nimbus BN (#4465) * Support for driving multiple EL nodes from a single Nimbus BN Full list of changes: * Eth1Monitor has been renamed to ELManager to match its current responsibilities better. * The ELManager is no longer optional in the code (it won't have a nil value under any circumstances). * The support for subscribing for headers was removed as it only worked with WebSockets and contributed significant complexity while bringing only a very minor advantage. * The `--web3-url` parameter has been deprecated in favor of a new `--el` parameter. The new parameter has a reasonable default value and supports specifying a different JWT for each connection. Each connection can also be configured with a different set of responsibilities (e.g. download deposits, validate blocks and/or produce blocks). On the command-line, these properties can be configured through URL properties stored in the #anchor part of the URL. In TOML files, they come with a very natural syntax (althrough the URL scheme is also supported). * The previously scattered EL-related state and logic is now moved to `eth1_monitor.nim` (this module will be renamed to `el_manager.nim` in a follow-up commit). State is assigned properly either to the `ELManager` or the to individual `ELConnection` objects where appropriate. The ELManager executes all Engine API requests against all attached EL nodes, in parallel. It compares their results and if there is a disagreement regarding the validity of a certain payload, this is detected and the beacon node is protected from publishing a block with a potential execution layer consensus bug in it. The BN provides metrics per EL node for the number of successful or failed requests for each type Engine API requests. If an EL node goes offline and connectivity is resoted later, we report the problem and the remedy in edge-triggered fashion. * More progress towards implementing Deneb block production in the VC and comparing the value of blocks produced by the EL and the builder API. * Adds a Makefile target for the zhejiang testnet
2023-03-05 01:40:21 +00:00
elManager = new ELManager # TODO: initialise this properly
more efficient forkchoiceUpdated usage (#4055) * more efficient forkchoiceUpdated usage * await rather than asyncSpawn; ensure head update before dag.updateHead * use action tracker rather than attached validators to check for next slot proposal; use wall slot + 1 rather than state slot + 1 to correctly check when missing blocks * re-add two-fcU case for when newPayload not VALID * check dynamicFeeRecipientsStore for potential proposal * remove duplicate checks for whether next proposer
2022-09-07 18:34:52 +00:00
actionTracker: ActionTracker
allow execution clients several seconds to construct blocks (#4012)
2022-08-23 16:19:52 +00:00
keymanagerHost: ref KeymanagerHost
kiln beacon node (#3540) * kiln bn * use version of beacon_chain_db * have Eth1Monitor abstract more tightly over web3provider
2022-03-25 11:40:10 +00:00
consensusManager = ConsensusManager.new(
Support for driving multiple EL nodes from a single Nimbus BN (#4465) * Support for driving multiple EL nodes from a single Nimbus BN Full list of changes: * Eth1Monitor has been renamed to ELManager to match its current responsibilities better. * The ELManager is no longer optional in the code (it won't have a nil value under any circumstances). * The support for subscribing for headers was removed as it only worked with WebSockets and contributed significant complexity while bringing only a very minor advantage. * The `--web3-url` parameter has been deprecated in favor of a new `--el` parameter. The new parameter has a reasonable default value and supports specifying a different JWT for each connection. Each connection can also be configured with a different set of responsibilities (e.g. download deposits, validate blocks and/or produce blocks). On the command-line, these properties can be configured through URL properties stored in the #anchor part of the URL. In TOML files, they come with a very natural syntax (althrough the URL scheme is also supported). * The previously scattered EL-related state and logic is now moved to `eth1_monitor.nim` (this module will be renamed to `el_manager.nim` in a follow-up commit). State is assigned properly either to the `ELManager` or the to individual `ELConnection` objects where appropriate. The ELManager executes all Engine API requests against all attached EL nodes, in parallel. It compares their results and if there is a disagreement regarding the validity of a certain payload, this is detected and the beacon node is protected from publishing a block with a potential execution layer consensus bug in it. The BN provides metrics per EL node for the number of successful or failed requests for each type Engine API requests. If an EL node goes offline and connectivity is resoted later, we report the problem and the remedy in edge-triggered fashion. * More progress towards implementing Deneb block production in the VC and comparing the value of blocks produced by the EL and the builder API. * Adds a Makefile target for the zhejiang testnet
2023-03-05 01:40:21 +00:00
dag, attestationPool, quarantine, elManager, actionTracker,
load suggested fee recipient file also when keymanager is disabled (#4078) Since these files may have been created in a previous run or manually, we want to keep loading them even on nodes that don't enable the keystore API (for example static setups) Other changes: * log keystore loading progressively (#3699) * print initial fee recipient when loading validators * log dynamic fee recipient updates
2022-09-17 05:30:07 +00:00
newClone(DynamicFeeRecipientsStore.init()), "",
Use withdrawal credentials as default fee recipient (#4968)
2023-05-17 04:56:37 +00:00
Opt.some default(Eth1Address), defaultGasLimit)
remove StateData (#3507) One more step on the journey to reduce `BlockRef` usage across the codebase - this one gets rid of `StateData` whose job was to keep track of which block was last assigned to a state - these duties have now been taken over by `latest_block_root`, a fairly recent addition that computes this block root from state data (at a small cost that should be insignificant) 99% mechanical change.
2022-03-16 07:20:40 +00:00
state = newClone(dag.headState)
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
cache = StateCache()
b1 = addTestBlock(state[], cache).phase0Data
b2 = addTestBlock(state[], cache).phase0Data
time: spring cleaning (#3262) Time in the beacon chain is expressed relative to the genesis time - this PR creates a `beacon_time` module that collects helpers and utilities for dealing the time units - the new module does not deal with actual wall time (that's remains in `beacon_clock`). Collecting the time related stuff in one place makes it easier to find, avoids some circular imports and allows more easily identifying the code actually needs wall time to operate. * move genesis-time-related functionality into `spec/beacon_time` * avoid using `chronos.Duration` for time differences - it does not support negative values (such as when something happens earlier than it should) * saturate conversions between `FAR_FUTURE_XXX`, so as to avoid overflows * fix delay reporting in validator client so it uses the expected deadline of the slot, not "closest wall slot" * simplify looping over the slots of an epoch * `compute_start_slot_at_epoch` -> `start_slot` * `compute_epoch_at_slot` -> `epoch` A follow-up PR will (likely) introduce saturating arithmetic for the time units - this is merely code moves, renames and fixing of small bugs.
2022-01-11 10:01:54 +00:00
getTimeFn = proc(): BeaconTime = b2.message.slot.start_beacon_time()
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
processor = BlockProcessor.new(
reduce `nim-eth` dependencies just for RNG (#5099) We have several modules that import `nim-eth` for the sole purpose of its `keys.newRng` function. This function is meanwhile a simple wrapper around `nim-bearssl`'s `HmacDrbgContext.new()`, so the import doesn't really serve a use anymore. Replace `keys.newRng` with the direct call to reduce `nim-eth` imports.
2023-06-19 22:43:50 +00:00
false, "", "", rng, taskpool, consensusManager,
Quarantine and reassembly of gossiped blobs and blocks (#4808)
2023-04-13 19:11:40 +00:00
validatorMonitor, blobQuarantine, getTimeFn)
prevent concurrent `storeBlock` calls (fixes #5285) (#5295) When a block is introduced to the system both via REST and gossip at the same time, we will call `storeBlock` from two locations leading to a dupliace check race condition as we wait for the EL. This issue may manifest in particular when using an external block builder that itself publishes the block onto the gossip network. * refactor enqueue flow * simplify calling `addBlock` * complete request manager verifier future for blobless blocks * re-verify parent conditions before adding block among other things, it might have gone stale or finalized between one call and the other
2023-08-17 13:12:37 +00:00
processorFut = processor.runQueueProcessingLoop()
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
remove `newPayload` from block production flow (#4186) * remove `newPayload` from block production flow * refactor block_processor to run `newPayload` as part of `storeBlock`
2022-10-14 19:48:56 +00:00
asyncTest "Reverse order block add & get" & preset():
prevent concurrent `storeBlock` calls (fixes #5285) (#5295) When a block is introduced to the system both via REST and gossip at the same time, we will call `storeBlock` from two locations leading to a dupliace check race condition as we wait for the EL. This issue may manifest in particular when using an external block builder that itself publishes the block onto the gossip network. * refactor enqueue flow * simplify calling `addBlock` * complete request manager verifier future for blobless blocks * re-verify parent conditions before adding block among other things, it might have gone stale or finalized between one call and the other
2023-08-17 13:12:37 +00:00
let
missing = await processor[].addBlock(
MsgSource.gossip, ForkedSignedBeaconBlock.init(b2),
Opt.none(BlobSidecars))
check: missing.error == VerifierError.MissingParent
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
check:
limit by-root requests to non-finalized blocks (#3293) * limit by-root requests to non-finalized blocks Presently, we keep a mapping from block root to `BlockRef` in memory - this has simplified reasoning about the dag, but is not sustainable with the chain growing. We can distinguish between two cases where by-root access is useful: * unfinalized blocks - this is where the beacon chain is operating generally, by validating incoming data as interesting for future fork choice decisions - bounded by the length of the unfinalized period * finalized blocks - historical access in the REST API etc - no bounds, really In this PR, we limit the by-root block index to the first use case: finalized chain data can more efficiently be addressed by slot number. Future work includes: * limiting the `BlockRef` horizon in general - each instance is 40 bytes+overhead which adds up - this needs further refactoring to deal with the tail vs state problem * persisting the finalized slot-to-hash index - this one also keeps growing unbounded (albeit slowly) Anyway, this PR easily shaves ~128mb of memory usage at the time of writing. * No longer honor `BeaconBlocksByRoot` requests outside of the non-finalized period - previously, Nimbus would generously return any block through this libp2p request - per the spec, finalized blocks should be fetched via `BeaconBlocksByRange` instead. * return `Opt[BlockRef]` instead of `nil` when blocks can't be found - this becomes a lot more common now and thus deserves more attention * `dag.blocks` -> `dag.forkBlocks` - this index only carries unfinalized blocks from now - `finalizedBlocks` covers the other `BlockRef` instances * in backfill, verify that the last backfilled block leads back to genesis, or panic * add backfill timings to log * fix missing check that `BlockRef` block can be fetched with `getForkedBlock` reliably * shortcut doppelganger check when feature is not enabled * in REST/JSON-RPC, fetch blocks without involving `BlockRef` * fix dag.blocks ref
2022-01-21 11:33:16 +00:00
not dag.containsForkBlock(b2.root) # Unresolved, shouldn't show up
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
Fetch by-root request directly from quarantine (#5167) When the requestmanager is busy fetching blocks, the queue might get filled with multiple entries of the same root - since there is no deduplication, requests containing the same root multiple times will be sent out. Also, because the items sit in the queue for a long time potentially, the request might be stale by the time that the manager is ready with the previous request. This PR removes the queue and directly fetches the blocks to download from the quarantine which solves both problems (the quarantine already de-duplicates and is clean of stale information). Removing the queue for blobs is left for a future PR. Co-authored-by: tersec <tersec@users.noreply.github.com>
2023-07-11 16:22:02 +00:00
FetchRecord(root: b1.root) in quarantine[].checkMissing(32)
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
let
prevent concurrent `storeBlock` calls (fixes #5285) (#5295) When a block is introduced to the system both via REST and gossip at the same time, we will call `storeBlock` from two locations leading to a dupliace check race condition as we wait for the EL. This issue may manifest in particular when using an external block builder that itself publishes the block onto the gossip network. * refactor enqueue flow * simplify calling `addBlock` * complete request manager verifier future for blobless blocks * re-verify parent conditions before adding block among other things, it might have gone stale or finalized between one call and the other
2023-08-17 13:12:37 +00:00
status = await processor[].addBlock(
MsgSource.gossip, ForkedSignedBeaconBlock.init(b1),
Opt.none(BlobSidecars))
limit by-root requests to non-finalized blocks (#3293) * limit by-root requests to non-finalized blocks Presently, we keep a mapping from block root to `BlockRef` in memory - this has simplified reasoning about the dag, but is not sustainable with the chain growing. We can distinguish between two cases where by-root access is useful: * unfinalized blocks - this is where the beacon chain is operating generally, by validating incoming data as interesting for future fork choice decisions - bounded by the length of the unfinalized period * finalized blocks - historical access in the REST API etc - no bounds, really In this PR, we limit the by-root block index to the first use case: finalized chain data can more efficiently be addressed by slot number. Future work includes: * limiting the `BlockRef` horizon in general - each instance is 40 bytes+overhead which adds up - this needs further refactoring to deal with the tail vs state problem * persisting the finalized slot-to-hash index - this one also keeps growing unbounded (albeit slowly) Anyway, this PR easily shaves ~128mb of memory usage at the time of writing. * No longer honor `BeaconBlocksByRoot` requests outside of the non-finalized period - previously, Nimbus would generously return any block through this libp2p request - per the spec, finalized blocks should be fetched via `BeaconBlocksByRange` instead. * return `Opt[BlockRef]` instead of `nil` when blocks can't be found - this becomes a lot more common now and thus deserves more attention * `dag.blocks` -> `dag.forkBlocks` - this index only carries unfinalized blocks from now - `finalizedBlocks` covers the other `BlockRef` instances * in backfill, verify that the last backfilled block leads back to genesis, or panic * add backfill timings to log * fix missing check that `BlockRef` block can be fetched with `getForkedBlock` reliably * shortcut doppelganger check when feature is not enabled * in REST/JSON-RPC, fetch blocks without involving `BlockRef` * fix dag.blocks ref
2022-01-21 11:33:16 +00:00
b1Get = dag.getBlockRef(b1.root)
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
check:
status.isOk
b1Get.isSome()
limit by-root requests to non-finalized blocks (#3293) * limit by-root requests to non-finalized blocks Presently, we keep a mapping from block root to `BlockRef` in memory - this has simplified reasoning about the dag, but is not sustainable with the chain growing. We can distinguish between two cases where by-root access is useful: * unfinalized blocks - this is where the beacon chain is operating generally, by validating incoming data as interesting for future fork choice decisions - bounded by the length of the unfinalized period * finalized blocks - historical access in the REST API etc - no bounds, really In this PR, we limit the by-root block index to the first use case: finalized chain data can more efficiently be addressed by slot number. Future work includes: * limiting the `BlockRef` horizon in general - each instance is 40 bytes+overhead which adds up - this needs further refactoring to deal with the tail vs state problem * persisting the finalized slot-to-hash index - this one also keeps growing unbounded (albeit slowly) Anyway, this PR easily shaves ~128mb of memory usage at the time of writing. * No longer honor `BeaconBlocksByRoot` requests outside of the non-finalized period - previously, Nimbus would generously return any block through this libp2p request - per the spec, finalized blocks should be fetched via `BeaconBlocksByRange` instead. * return `Opt[BlockRef]` instead of `nil` when blocks can't be found - this becomes a lot more common now and thus deserves more attention * `dag.blocks` -> `dag.forkBlocks` - this index only carries unfinalized blocks from now - `finalizedBlocks` covers the other `BlockRef` instances * in backfill, verify that the last backfilled block leads back to genesis, or panic * add backfill timings to log * fix missing check that `BlockRef` block can be fetched with `getForkedBlock` reliably * shortcut doppelganger check when feature is not enabled * in REST/JSON-RPC, fetch blocks without involving `BlockRef` * fix dag.blocks ref
2022-01-21 11:33:16 +00:00
dag.containsForkBlock(b1.root)
not dag.containsForkBlock(b2.root) # Async pipeline must still run
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
while processor[].hasBlocks():
poll()
let
limit by-root requests to non-finalized blocks (#3293) * limit by-root requests to non-finalized blocks Presently, we keep a mapping from block root to `BlockRef` in memory - this has simplified reasoning about the dag, but is not sustainable with the chain growing. We can distinguish between two cases where by-root access is useful: * unfinalized blocks - this is where the beacon chain is operating generally, by validating incoming data as interesting for future fork choice decisions - bounded by the length of the unfinalized period * finalized blocks - historical access in the REST API etc - no bounds, really In this PR, we limit the by-root block index to the first use case: finalized chain data can more efficiently be addressed by slot number. Future work includes: * limiting the `BlockRef` horizon in general - each instance is 40 bytes+overhead which adds up - this needs further refactoring to deal with the tail vs state problem * persisting the finalized slot-to-hash index - this one also keeps growing unbounded (albeit slowly) Anyway, this PR easily shaves ~128mb of memory usage at the time of writing. * No longer honor `BeaconBlocksByRoot` requests outside of the non-finalized period - previously, Nimbus would generously return any block through this libp2p request - per the spec, finalized blocks should be fetched via `BeaconBlocksByRange` instead. * return `Opt[BlockRef]` instead of `nil` when blocks can't be found - this becomes a lot more common now and thus deserves more attention * `dag.blocks` -> `dag.forkBlocks` - this index only carries unfinalized blocks from now - `finalizedBlocks` covers the other `BlockRef` instances * in backfill, verify that the last backfilled block leads back to genesis, or panic * add backfill timings to log * fix missing check that `BlockRef` block can be fetched with `getForkedBlock` reliably * shortcut doppelganger check when feature is not enabled * in REST/JSON-RPC, fetch blocks without involving `BlockRef` * fix dag.blocks ref
2022-01-21 11:33:16 +00:00
b2Get = dag.getBlockRef(b2.root)
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
check:
b2Get.isSome()
limit by-root requests to non-finalized blocks (#3293) * limit by-root requests to non-finalized blocks Presently, we keep a mapping from block root to `BlockRef` in memory - this has simplified reasoning about the dag, but is not sustainable with the chain growing. We can distinguish between two cases where by-root access is useful: * unfinalized blocks - this is where the beacon chain is operating generally, by validating incoming data as interesting for future fork choice decisions - bounded by the length of the unfinalized period * finalized blocks - historical access in the REST API etc - no bounds, really In this PR, we limit the by-root block index to the first use case: finalized chain data can more efficiently be addressed by slot number. Future work includes: * limiting the `BlockRef` horizon in general - each instance is 40 bytes+overhead which adds up - this needs further refactoring to deal with the tail vs state problem * persisting the finalized slot-to-hash index - this one also keeps growing unbounded (albeit slowly) Anyway, this PR easily shaves ~128mb of memory usage at the time of writing. * No longer honor `BeaconBlocksByRoot` requests outside of the non-finalized period - previously, Nimbus would generously return any block through this libp2p request - per the spec, finalized blocks should be fetched via `BeaconBlocksByRange` instead. * return `Opt[BlockRef]` instead of `nil` when blocks can't be found - this becomes a lot more common now and thus deserves more attention * `dag.blocks` -> `dag.forkBlocks` - this index only carries unfinalized blocks from now - `finalizedBlocks` covers the other `BlockRef` instances * in backfill, verify that the last backfilled block leads back to genesis, or panic * add backfill timings to log * fix missing check that `BlockRef` block can be fetched with `getForkedBlock` reliably * shortcut doppelganger check when feature is not enabled * in REST/JSON-RPC, fetch blocks without involving `BlockRef` * fix dag.blocks ref
2022-01-21 11:33:16 +00:00
b2Get.get().parent == b1Get.get()
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
more withdrowls (#4674)
2023-03-02 16:13:35 +00:00
dag.updateHead(b2Get.get(), quarantine[], [])
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
dag.pruneAtFinalization()
# The heads structure should have been updated to contain only the new
# b2 head
check:
limit by-root requests to non-finalized blocks (#3293) * limit by-root requests to non-finalized blocks Presently, we keep a mapping from block root to `BlockRef` in memory - this has simplified reasoning about the dag, but is not sustainable with the chain growing. We can distinguish between two cases where by-root access is useful: * unfinalized blocks - this is where the beacon chain is operating generally, by validating incoming data as interesting for future fork choice decisions - bounded by the length of the unfinalized period * finalized blocks - historical access in the REST API etc - no bounds, really In this PR, we limit the by-root block index to the first use case: finalized chain data can more efficiently be addressed by slot number. Future work includes: * limiting the `BlockRef` horizon in general - each instance is 40 bytes+overhead which adds up - this needs further refactoring to deal with the tail vs state problem * persisting the finalized slot-to-hash index - this one also keeps growing unbounded (albeit slowly) Anyway, this PR easily shaves ~128mb of memory usage at the time of writing. * No longer honor `BeaconBlocksByRoot` requests outside of the non-finalized period - previously, Nimbus would generously return any block through this libp2p request - per the spec, finalized blocks should be fetched via `BeaconBlocksByRange` instead. * return `Opt[BlockRef]` instead of `nil` when blocks can't be found - this becomes a lot more common now and thus deserves more attention * `dag.blocks` -> `dag.forkBlocks` - this index only carries unfinalized blocks from now - `finalizedBlocks` covers the other `BlockRef` instances * in backfill, verify that the last backfilled block leads back to genesis, or panic * add backfill timings to log * fix missing check that `BlockRef` block can be fetched with `getForkedBlock` reliably * shortcut doppelganger check when feature is not enabled * in REST/JSON-RPC, fetch blocks without involving `BlockRef` * fix dag.blocks ref
2022-01-21 11:33:16 +00:00
dag.heads.mapIt(it) == @[b2Get.get()]
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
# check that init also reloads block graph
var
Validator monitoring (#2925) Validator monitoring based on and mostly compatible with the implementation in Lighthouse - tracks additional logs and metrics for specified validators so as to stay on top on performance. The implementation works more or less the following way: * Validator pubkeys are singled out for monitoring - these can be running on the node or not * For every action that the validator takes, we record steps in the process such as messages being seen on the network or published in the API * When the dust settles at the end of an epoch, we report the information from one epoch before that, which coincides with the balances being updated - this is a tradeoff between being correct (waiting for finalization) and providing relevant information in a timely manner)
2021-12-20 19:20:31 +00:00
validatorMonitor2 = newClone(ValidatorMonitor.init())
dag2 = init(ChainDAGRef, defaultRuntimeConfig, db, validatorMonitor2, {})
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
check:
# ensure we loaded the correct head state
dag2.head.root == b2.root
remove StateData (#3507) One more step on the journey to reduce `BlockRef` usage across the codebase - this one gets rid of `StateData` whose job was to keep track of which block was last assigned to a state - these duties have now been taken over by `latest_block_root`, a fairly recent addition that computes this block root from state data (at a small cost that should be insignificant) 99% mechanical change.
2022-03-16 07:20:40 +00:00
getStateRoot(dag2.headState) == b2.message.state_root
limit by-root requests to non-finalized blocks (#3293) * limit by-root requests to non-finalized blocks Presently, we keep a mapping from block root to `BlockRef` in memory - this has simplified reasoning about the dag, but is not sustainable with the chain growing. We can distinguish between two cases where by-root access is useful: * unfinalized blocks - this is where the beacon chain is operating generally, by validating incoming data as interesting for future fork choice decisions - bounded by the length of the unfinalized period * finalized blocks - historical access in the REST API etc - no bounds, really In this PR, we limit the by-root block index to the first use case: finalized chain data can more efficiently be addressed by slot number. Future work includes: * limiting the `BlockRef` horizon in general - each instance is 40 bytes+overhead which adds up - this needs further refactoring to deal with the tail vs state problem * persisting the finalized slot-to-hash index - this one also keeps growing unbounded (albeit slowly) Anyway, this PR easily shaves ~128mb of memory usage at the time of writing. * No longer honor `BeaconBlocksByRoot` requests outside of the non-finalized period - previously, Nimbus would generously return any block through this libp2p request - per the spec, finalized blocks should be fetched via `BeaconBlocksByRange` instead. * return `Opt[BlockRef]` instead of `nil` when blocks can't be found - this becomes a lot more common now and thus deserves more attention * `dag.blocks` -> `dag.forkBlocks` - this index only carries unfinalized blocks from now - `finalizedBlocks` covers the other `BlockRef` instances * in backfill, verify that the last backfilled block leads back to genesis, or panic * add backfill timings to log * fix missing check that `BlockRef` block can be fetched with `getForkedBlock` reliably * shortcut doppelganger check when feature is not enabled * in REST/JSON-RPC, fetch blocks without involving `BlockRef` * fix dag.blocks ref
2022-01-21 11:33:16 +00:00
dag2.getBlockRef(b1.root).isSome()
dag2.getBlockRef(b2.root).isSome()
move quarantine outside of chaindag (#3124) * move quarantine outside of chaindag The quarantine has been part of the ChainDAG for the longest time, but this design has a few issues: * the function in which blocks are verified and added to the dag becomes reentrant and therefore difficult to reason about - we're currently using a stateful flag to work around it * quarantined blocks bypass the processing queue leading to a processing stampede * the quarantine flow is unsuitable for orphaned attestations - these should also should be quarantined eventually Instead of processing the quarantine inside ChainDAG, this PR moves re-queueing to `block_processor` which already is responsible for dealing with follow-up work when a block is added to the dag This sets the stage for keeping attestations in the quarantine as well. Also: * make `BlockError` `{.pure.}` * avoid use of `ValidationResult` in block clearance (that's for gossip)
2021-12-06 09:49:01 +00:00
dag2.heads.len == 1
dag2.heads[0].root == b2.root