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nimbus-eth2/beacon_chain/gossip_processing
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Etan Kissling 12dc427535
introduce light client processor (#3509) 
Adds `LightClientProcessor` as the pendant to `BlockProcessor` while
operating in light client mode. Note that a similar mechanism based on
async futures is used for interoperability with existing infrastructure,
despite light client object validation being done synchronously.
 		2022-03-17 23:26:56 +01:00
..
README.md update unchanged specs/phase0/p2p-interface.md URL references from v1.1.9 to v1.1.10 (#3510) 2022-03-16 10:40:35 +00:00
batch_validation.nim Harden CommitteeIndex, SubnetId, SyncSubcommitteeIndex (#3259) 2022-01-09 01:28:49 +02:00
block_processor.nim remove StateData (#3507) 2022-03-16 08:20:40 +01:00
consensus_manager.nim proc -> func, mainly in spec/state transition and adjecent modules (#3405) 2022-02-17 11:53:55 +00:00
eth2_processor.nim libp2p light client gossip validation (#3486) 2022-03-14 14:05:38 +01:00
gossip_validation.nim Prune `BlockRef` on finalization (#3513) 2022-03-17 17:42:56 +00:00
light_client_processor.nim introduce light client processor (#3509) 2022-03-17 23:26:56 +01:00

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