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Compute LIGHT_CLIENT_UPDATE_TIMEOUT in lieu of maintaining a constant

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Alex Stokes 2021-05-04 13:42:02 -07:00
parent 7a168be862
commit 3b80324119
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3 changed files with 2 additions and 12 deletions
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2
configs/mainnet/altair.yaml
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@ -47,8 +47,6 @@ ALTAIR_FORK_EPOCH: 18446744073709551615
MIN_SYNC_COMMITTEE_PARTICIPANTS: 1 MIN_SYNC_COMMITTEE_PARTICIPANTS: 1
# 2**13 # 2**13
MAX_VALID_LIGHT_CLIENT_UPDATES: 8192 MAX_VALID_LIGHT_CLIENT_UPDATES: 8192
# 2**13 (=8192)
LIGHT_CLIENT_UPDATE_TIMEOUT: 8192
# Validator # Validator

2
configs/minimal/altair.yaml
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@ -47,8 +47,6 @@ ALTAIR_FORK_EPOCH: 18446744073709551615
MIN_SYNC_COMMITTEE_PARTICIPANTS: 1 MIN_SYNC_COMMITTEE_PARTICIPANTS: 1
# [customized] # [customized]
MAX_VALID_LIGHT_CLIENT_UPDATES: 32 MAX_VALID_LIGHT_CLIENT_UPDATES: 32
# [customized]
LIGHT_CLIENT_UPDATE_TIMEOUT: 32
# Validator # Validator
# --------------------------------------------------------------- # ---------------------------------------------------------------

10
specs/altair/sync-protocol.md
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@ -12,7 +12,6 @@
- [Constants](#constants) - [Constants](#constants)
- [Configuration](#configuration) - [Configuration](#configuration)
- [Misc](#misc) - [Misc](#misc)
- [Time parameters](#time-parameters)
- [Containers](#containers) - [Containers](#containers)
- [`LightClientSnapshot`](#lightclientsnapshot) - [`LightClientSnapshot`](#lightclientsnapshot)
- [`LightClientUpdate`](#lightclientupdate) - [`LightClientUpdate`](#lightclientupdate)
@ -53,12 +52,6 @@ uses sync committees introduced in [this beacon chain extension](./beacon-chain.
| `MIN_SYNC_COMMITTEE_PARTICIPANTS` | `1` | | `MIN_SYNC_COMMITTEE_PARTICIPANTS` | `1` |
| `MAX_VALID_LIGHT_CLIENT_UPDATES` | `uint64(2**64 - 1)` | | `MAX_VALID_LIGHT_CLIENT_UPDATES` | `uint64(2**64 - 1)` |
### Time parameters
| Name | Value | Unit | Duration |
| - | - | :-: | :-: |
| `LIGHT_CLIENT_UPDATE_TIMEOUT` | `Slot(2**13)` | slots | ~27 hours |
## Containers ## Containers
### `LightClientSnapshot` ### `LightClientSnapshot`
@ -184,6 +177,7 @@ def process_light_client_update(store: LightClientStore, update: LightClientUpda
validate_light_client_update(store.snapshot, update, genesis_validators_root) validate_light_client_update(store.snapshot, update, genesis_validators_root)
store.valid_updates.append(update) store.valid_updates.append(update)
update_timeout = SLOTS_PER_EPOCH * EPOCHS_PER_SYNC_COMMITTEE_PERIOD
if ( if (
sum(update.sync_committee_bits) * 3 >= len(update.sync_committee_bits) * 2 sum(update.sync_committee_bits) * 3 >= len(update.sync_committee_bits) * 2
and update.finality_header != BeaconBlockHeader() and update.finality_header != BeaconBlockHeader()
@ -193,7 +187,7 @@ def process_light_client_update(store: LightClientStore, update: LightClientUpda
# It may be changed to re-organizable light client design. See the on-going issue eth2.0-specs#2182. # It may be changed to re-organizable light client design. See the on-going issue eth2.0-specs#2182.
apply_light_client_update(store.snapshot, update) apply_light_client_update(store.snapshot, update)
store.valid_updates = [] store.valid_updates = []
elif current_slot > store.snapshot.header.slot + LIGHT_CLIENT_UPDATE_TIMEOUT: elif current_slot > store.snapshot.header.slot + update_timeout:
# Forced best update when the update timeout has elapsed # Forced best update when the update timeout has elapsed
apply_light_client_update(store.snapshot, apply_light_client_update(store.snapshot,
max(store.valid_updates, key=lambda update: sum(update.sync_committee_bits))) max(store.valid_updates, key=lambda update: sum(update.sync_committee_bits)))