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* use ForkedHashedBeaconState in StateData * fix FAR_FUTURE_EPOCH -> slot overflow; almost always use assign() * avoid stack allocation in maybeUpgradeStateToAltair() * create and use dispatch functions for check_attester_slashing(), check_proposer_slashing(), and check_voluntary_exit() * use getStateRoot() instead of various state.data.hbsPhase0.root * remove withStateVars.hashedState(), which doesn't work as a design anymore * introduce spec/datatypes/altair into beacon_chain_db * fix inefficient codegen for getStateField(largeStateField) * state_transition_slots() doesn't either need/use blocks or runtime presets * combine process_slots(HBS)/state_transition_slots(HBS) which differ only in last-slot htr optimization * getStateField(StateData, ...) was replaced by getStateField(ForkedHashedBeaconState, ...) * fix rollback * switch some state_transition(), process_slots, makeTestBlocks(), etc to use ForkedHashedBeaconState * remove state_transition(phase0.HashedBeaconState) * remove process_slots(phase0.HashedBeaconState) * remove state_transition_block(phase0.HashedBeaconState) * remove unused callWithBS(); separate case expression from if statement * switch back from nested-ref-object construction to (ref Foo)(Bar())
Consensus object pools
This folder holds the various consensus object pools needed for a blockchain client.
Object in those pools have passed the "gossip validation" filter according to specs:
- blocks: https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#beacon_block
- aggregate attestations: https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#beacon_aggregate_and_proof
- unaggregate attestation: https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#beacon_attestation_subnet_id
- voluntary exits https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#voluntary_exit
- Attester slashings https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#attester_slashing
- Proposer slashins https://github.com/ethereum/eth2.0-specs/blob/v1.0.1/specs/phase0/p2p-interface.md#proposer_slashing
After "gossip validation" the consensus objects can be rebroadcasted as they are optimistically good, however for internal processing further verification is needed. For blocks, this means verifying state transition and all contained cryptographic signatures (instead of just the proposer signature). For other consensus objects, it is possible that gossip validation is a superset of consensus verification (TODO).
The pools presenet in this folder are:
- block_pools:
- block_quarantine: for seemingly valid blocks that are on a fork unknown to us.
- block_clearance: to verify (state_transition + cryptography) candidate blocks.
- blockchain_dag: an in-memory direct-acyclic graph of fully validated and verified blockchain candidates with the tail being the last finalized epoch. A block in the DAG MUST be in the fork choice and a block in the fork choice MUST be in the DAG (except for orphans following finalization). On finalization non-empty epoch blocks are stored in the beacon_chain_db.
- attestation_pool: Handles the attestation received from gossip and collect them for fork choice.
- exit_pool: Handle voluntary exits and forced exits (attester slashings and proposer slashings)