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nimbus-eth2/beacon_chain/gossip_processing
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Etan Kissling bbf1d6030c
add hooks for observing LC progress (#4401) 
For Fluffy injection, add observer callbacks that get called whenever
new light client data is sucecssfully processed.

```
  proc onLightClientObject(
      lightClient: LightClient, obj: SomeLightClientObject) =
    info "New LC object", obj

  lightClient.bootstrapObserver =
    proc(lightClient: LightClient, obj: altair.LightClientBootstrap) =
      lightClient.onLightClientObject(obj)
  lightClient.updateObserver =
    proc(lightClient: LightClient, obj: altair.LightClientUpdate) =
      lightClient.onLightClientObject(obj)
  lightClient.finalityUpdateObserver =
    proc(lightClient: LightClient, obj: altair.LightClientFinalityUpdate) =
      lightClient.onLightClientObject(obj)
  lightClient.optimisticUpdateObserver =
    proc(lightClient: LightClient, obj: altair.LightClientOptimisticUpdate) =
      lightClient.onLightClientObject(obj)
```
 		2022-12-08 16:24:16 +00:00
..
README.md EIP4844 tweaks to pass SSZ consensus object tests (#4390) 2022-12-05 21:36:53 +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 `withUpdatedState` injects `updatedState` rather than `state` template (#4375) 2022-11-30 16:37:23 +02:00
eth2_processor.nim Fix doppelganger protection in validator duties. (#4345) 2022-11-24 09:48:10 +02:00
gossip_validation.nim eip4844 fork and epoch transition tests; some eip4844 gossip (#4393) 2022-12-06 16:43:11 +00:00
light_client_processor.nim add hooks for observing LC progress (#4401) 2022-12-08 16:24:16 +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