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tersec ee75d45a8b
fix `ATTESTATION_PROPAGATION_SLOT_RANGE` unknown constant warning (#5433) 
* fix ATTESTATION_PROPAGATION_SLOT_RANGE unknown constant warning

* verify underflow not an issue
 		2023-09-19 06:54:58 +00:00
..
README.md update some consensus-spec URLs to v1.4.0-beta.1 (#5429) 2023-09-14 18:23:59 +00:00
batch_validation.nim avoid `Taskpool.spawn` within `{.async.}` for Nim 2.0 (#5393) 2023-09-05 21:36:35 +02:00
block_processor.nim separate CL/EL timing in add block log (#5380) 2023-09-04 20:23:29 +03:00
eth2_processor.nim ensure blob quarantine insertion always succeeds (#5369) 2023-08-29 16:46:25 +00:00
gossip_validation.nim fix `ATTESTATION_PROPAGATION_SLOT_RANGE` unknown constant warning (#5433) 2023-09-19 06:54:58 +00:00
light_client_processor.nim remove `{.raises: [Defect].}` Nim 1.2 compatibility (#5352) 2023-08-25 11:29:07 +02:00
optimistic_processor.nim remove `{.raises: [Defect].}` Nim 1.2 compatibility (#5352) 2023-08-25 11:29:07 +02:00

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