status-im
/
nimbus-eth2
mirror of https://github.com/status-im/nimbus-eth2.git
2
0
Fork 0
Code Issues Projects Releases Wiki Activity
nimbus-eth2/beacon_chain/gossip_processing
History
henridf 727920a571
Refactor block/blobs types (#4491) 
* Refactor block/blobs types

Use type system to enforce invariant that a pre-4844 block cannot have
a sidecar.

* Update beacon_chain/nimbus_beacon_node.nim

Co-authored-by: tersec <tersec@users.noreply.github.com>

* review feedback

Co-authored-by: tersec <tersec@users.noreply.github.com>
 		2023-01-16 16:26:48 +00:00
..
README.md a few consensus spec ref URL updates (#4483) 2023-01-10 16:14:17 +00:00
batch_validation.nim spec: Option -> Opt (#4488) 2023-01-11 12:29:21 +00:00
block_processor.nim Wire up engine_newPayloadV3 (#4482) 2023-01-11 18:21:19 +00:00
eth2_processor.nim Refactor block/blobs types (#4491) 2023-01-16 16:26:48 +00:00
gossip_validation.nim Refactor block/blobs types (#4491) 2023-01-16 16:26:48 +00:00
light_client_processor.nim use `ForkedLightClientStore` internally (#4512) 2023-01-16 16:53:45 +01:00
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