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nimbus-eth2/beacon_chain/gossip_processing
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Eugene Kabanov 18409a69e1
Light forward sync mechanism (#6515) 
* Initial commit.

* Add hybrid syncing.

* Compilation fixes.

* Cast custom event for our purposes.

* Instantiate AsyncEventQueue properly.

* Fix mistype.

* Further research on optimistic updates.

* Fixing circular deps.

* Add backfilling.

* Add block download feature.

* Add block store.

* Update backfill information before storing block.

* Use custom block verifier for backfilling sync.

* Skip signature verification in backfilling.

* Add one more generic reload to storeBackfillBlock().

* Add block verification debugging statements.

* Add more debugging

* Do not use database for backfilling, part 1.

* Fix for stash.

* Stash fixes part 2.

* Prepare for testing.

* Fix assertion.

* Fix post-restart syncing process.

* Update backfill loading log statement.
Use proper backfill slot callback for sync manager.

* Add handling of Duplicates.

* Fix store duration and block backfilled log statements.

* Add proper syncing state log statement.

* Add snappy compression to beaconchain_file.
Format syncing speed properly.

* Add blobs verification.

* Add `slot` number to file structure for easy navigation over stream of compressed objects.

* Change database filename.

* Fix structure size.

* Add more consistency properties.

* Fix checkRepair() issues.

* Preparation to state rebuild process.

* Add plain & compressed size.

* Debugging snappy encode process.

* Add one more debugging line.

* Dump blocks.

* One more filedump.

* Fix chunk corruption code.

* Fix detection issue.

* Some fixes in state rebuilding process.

* Add more clearance steps.

* Move updateHead() back to block_processor.

* Fix compilation issues.

* Make code more async friendly.

* Fix async issues.
Add more information when proposer verification failed.

* Fix 8192 slots issue.

* Fix Future double completion issue.

* Pass updateFlags to some of the core procedures.

* Fix tests.

* Improve initial sync handling mechanism.

* Fix checkStateTransition() performance improvements.

* Add some performance tuning and meters.

* Light client performance tuning.

* Remove debugging statement.

* Use single file descriptor for blockchain file.

* Attempt to fix LC.

* Fix timeleft calculation when untrusted sync backfilling started right after LC block received.

* Workaround for `chronicles` + `results` `error` issue.
Remove some compilation warnings.
Fix `CatchableError` leaks on Windows.

* Address review comments.

* Address review comments part 2.

* Address review comments part 1.

* Rebase and fix the issues.

* Address review comments part 3.

* Add tests and fix some issues in auto-repair mechanism.

* Add tests to all_tests.

* Rename binary test file to pass restrictions.

* Add `bin` extension to excluded list.
Recover binary test data.

* Rename fixture file to .bin again.

* Update AllTests.

* Address review comments part 4.

* Address review comments part 5 and fix tests.

* Address review comments part 6.

* Eliminate foldl and combine from blobs processing.
Add some tests to ensure that checkResponse() also checks for correct order.

* Fix forgotten place.

* Post rebase fixes.

* Add unique slots tests.

* Optimize updateHead() code.

* Add forgotten changes.

* Address review comments on state as argument.
 		2024-10-30 05:38:53 +00:00
..
README.md automated consensus spec URL updating to v1.5.0-alpha.8 (#6617) 2024-10-09 08:37:35 +02:00
batch_validation.nim Use Pippenger multiplication for combining multiple sigs of same msg (#6484) 2024-08-16 23:42:46 +02:00
block_processor.nim Light forward sync mechanism (#6515) 2024-10-30 05:38:53 +00:00
eth2_processor.nim add Electra attester slashing gossip support (#6582) 2024-09-26 08:11:58 +02:00
gossip_validation.nim add gossip validation for dc, and data column quarantine strategy (#6581) 2024-10-22 05:19:34 +00:00
light_client_processor.nim extend light client protocol for Electra (#6375) 2024-06-26 19:02:03 +00:00
optimistic_processor.nim remove Bellatrix EL syncing support from light client (#6352) 2024-06-14 01:23:17 +00:00

README.md

Gossip Processing

This folder holds a collection of modules to:

  • validate raw gossip data before
    • rebroadcasting it (potentially aggregated)
    • sending it to one of the consensus object pools

Validation

Gossip validation is different from consensus verification in particular for blocks.

There are multiple consumers of validated consensus objects:

  • a ValidationResult.Accept output triggers rebroadcasting in libp2p
    • We jump into method validate(PubSub, Message) in libp2p/protocols/pubsub/pubsub.nim
    • which was called by rpcHandler(GossipSub, PubSubPeer, RPCMsg)
  • a blockValidator message enqueues the validated object to the processing queue in block_processor
    • blockQueue: AsyncQueue[BlockEntry] (shared with request_manager and sync_manager)
    • This queue is then regularly processed to be made available to the consensus object pools.
  • a xyzValidator message adds the validated object to a pool in eth2_processor
    • Attestations (unaggregated and aggregated) get collected into batches.
    • Once a threshold is exceeded or after a timeout, they get validated together using BatchCrypto.

Security concerns

As the first line of defense in Nimbus, modules must be able to handle bursts of data that may come:

  • from malicious nodes trying to DOS us
  • from long periods of non-finality, creating lots of forks, attestations