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tersec 0f6d19b4b3
implement v1.2.0 optimistic sync tests (#4174) 
* implement v1.2.0 optimistic sync tests

* Update beacon_chain/consensus_object_pools/blockchain_dag.nim

Co-authored-by: Etan Kissling <etan@status.im>

* `lvh` -> `latestValidHash` and only invalidate one specific block"

* `getEarliestInvalidRoot` -> `getEarliestInvalidBlockRoot`; `defaultEarliestInvalidRoot` -> `defaultEarliestInvalidBlockRoot`

Co-authored-by: Etan Kissling <etan@status.im>
 		2022-09-27 15:11:47 +03:00
..
README.md update consensus spec ref URLs to v1.2.0 (#4164) 2022-09-23 07:56:06 +00:00
batch_validation.nim cache shuffling separately from other EpochRef data (fixes #2677) (#3990) 2022-08-18 21:07:01 +03:00
block_processor.nim implement v1.2.0 optimistic sync tests (#4174) 2022-09-27 15:11:47 +03:00
eth2_processor.nim update spec ref URLs (#4005) 2022-08-20 16:03:32 +00:00
gossip_validation.nim a few more manual v1.2.0 consensus spec ref URL updates (#4165) 2022-09-23 12:00:17 +00:00
light_client_processor.nim update spec ref URLs (#4005) 2022-08-20 16:03:32 +00:00
optimistic_processor.nim rm optimistic candidate block check from LC (#4131) 2022-09-17 00:42:19 +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