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specs/_features/eip7668/beacon_chain.md
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@ -1,4 +1,4 @@
Limit churn -- The Beacon Chain EIP-7668 -- The Beacon Chain
## Table of contents ## Table of contents
@ -11,7 +11,7 @@ Limit churn -- The Beacon Chain
- [Validator cycle](#validator-cycle) - [Validator cycle](#validator-cycle)
- [Helper functions](#helper-functions) - [Helper functions](#helper-functions)
- [Beacon state accessors](#beacon-state-accessors) - [Beacon state accessors](#beacon-state-accessors)
- [New `get_validator_inbound_churn_limit`](#new-get_validator_inbound_churn_limit) - [New `get_validator_activation_churn_limit`](#new-get_validator_activation_churn_limit)
- [Beacon chain state transition function](#beacon-chain-state-transition-function) - [Beacon chain state transition function](#beacon-chain-state-transition-function)
- [Epoch processing](#epoch-processing) - [Epoch processing](#epoch-processing)
- [Registry updates](#registry-updates) - [Registry updates](#registry-updates)
@ -31,27 +31,20 @@ This is the beacon chain specification to limit the max inbound churn value, mot
| Name | Value | | Name | Value |
| - | - | | - | - |
| `MAX_PER_EPOCH_INBOUND_CHURN_LIMIT` | `uint64(12)` (= 12) | | `MAX_PER_EPOCH_ACTIVATION_CHURN_LIMIT` | `uint64(12)` (= 12) |
## Helper functions ## Helper functions
### Beacon state accessors ### Beacon state accessors
#### New `get_validator_inbound_churn_limit` #### New `get_validator_activation_churn_limit`
```python ```python
def get_validator_inbound_churn_limit(state: BeaconState) -> uint64: def get_validator_activation_churn_limit(state: BeaconState) -> uint64:
""" """
Return the validator inbound churn limit for the current epoch. Return the validator activation churn limit for the current epoch.
""" """
active_validator_indices = get_active_validator_indices(state, get_current_epoch(state)) return min(MAX_PER_EPOCH_INBOUND_CHURN_LIMIT, get_validator_churn_limit(state))
return min(
MAX_PER_EPOCH_INBOUND_CHURN_LIMIT,
max(
MIN_PER_EPOCH_CHURN_LIMIT,
uint64(len(active_validator_indices)) // CHURN_LIMIT_QUOTIENT,
),
)
``` ```
## Beacon chain state transition function ## Beacon chain state transition function
@ -60,6 +53,8 @@ def get_validator_inbound_churn_limit(state: BeaconState) -> uint64:
#### Registry updates #### Registry updates
Note: The function `process_registry_updates` is modified to utilize `get_validator_inbound_churn_limit()` the rate limit the activation queue for EIP-7668.
```python ```python
def process_registry_updates(state: BeaconState) -> None: def process_registry_updates(state: BeaconState) -> None:
# Process activation eligibility and ejections # Process activation eligibility and ejections
@ -80,8 +75,8 @@ def process_registry_updates(state: BeaconState) -> None:
# Order by the sequence of activation_eligibility_epoch setting and then index # Order by the sequence of activation_eligibility_epoch setting and then index
], key=lambda index: (state.validators[index].activation_eligibility_epoch, index)) ], key=lambda index: (state.validators[index].activation_eligibility_epoch, index))
# Dequeued validators for activation up to churn limit # Dequeued validators for activation up to churn limit
# [Modified in limit churn] # [Modified in EIP7668]
for index in activation_queue[:get_validator_inbound_churn_limit(state)]: for index in activation_queue[:get_validator_activation_churn_limit(state)]:
validator = state.validators[index] validator = state.validators[index]
validator.activation_epoch = compute_activation_exit_epoch(get_current_epoch(state)) validator.activation_epoch = compute_activation_exit_epoch(get_current_epoch(state))
``` ```