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| Original file line number | Diff line number | Diff line change |
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| # Capella Light Client -- Fork Logic | ||
|
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| ## Table of contents | ||
|
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| <!-- TOC --> | ||
| <!-- START doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> | ||
|
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| - [Introduction](#introduction) | ||
| - [Upgrading light client data](#upgrading-light-client-data) | ||
| - [Upgrading the store](#upgrading-the-store) | ||
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| <!-- END doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- /TOC --> | ||
|
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| ## Introduction | ||
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| This document describes how to upgrade existing light client objects based on the [Altair specification](../../altair/light-client/sync-protocol.md) to Capella. This is necessary when processing pre-Capella data with a post-Capella `LightClientStore`. Note that the data being exchanged over the network protocols uses the original format. | ||
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| ### Upgrading light client data | ||
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| A Capella `LightClientStore` can still process earlier light client data. In order to do so, that pre-Capella data needs to be locally upgraded to Capella before processing. | ||
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| ```python | ||
| def upgrade_lc_header_to_capella(pre: bellatrix.LightClientHeader) -> LightClientHeader: | ||
| return LightClientHeader( | ||
| beacon=pre.beacon, | ||
| ) | ||
| ``` | ||
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| ```python | ||
| def upgrade_lc_bootstrap_to_capella(pre: bellatrix.LightClientBootstrap) -> LightClientBootstrap: | ||
| return LightClientBootstrap( | ||
| header=upgrade_lc_header_to_capella(pre.header), | ||
| current_sync_committee=pre.current_sync_committee, | ||
| current_sync_committee_branch=pre.current_sync_committee_branch, | ||
| ) | ||
| ``` | ||
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| ```python | ||
| def upgrade_lc_update_to_capella(pre: bellatrix.LightClientUpdate) -> LightClientUpdate: | ||
| return LightClientUpdate( | ||
| attested_header=upgrade_lc_header_to_capella(pre.attested_header), | ||
| next_sync_committee=pre.next_sync_committee, | ||
| next_sync_committee_branch=pre.next_sync_committee_branch, | ||
| finalized_header=upgrade_lc_header_to_capella(pre.finalized_header), | ||
| finality_branch=pre.finality_branch, | ||
| sync_aggregate=pre.sync_aggregate, | ||
| signature_slot=pre.signature_slot, | ||
| ) | ||
| ``` | ||
|
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| ```python | ||
| def upgrade_lc_finality_update_to_capella(pre: bellatrix.LightClientFinalityUpdate) -> LightClientFinalityUpdate: | ||
| return LightClientFinalityUpdate( | ||
| attested_header=upgrade_lc_header_to_capella(pre.attested_header), | ||
| finalized_header=upgrade_lc_header_to_capella(pre.finalized_header), | ||
| finality_branch=pre.finality_branch, | ||
| sync_aggregate=pre.sync_aggregate, | ||
| signature_slot=pre.signature_slot, | ||
| ) | ||
| ``` | ||
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| ```python | ||
| def upgrade_lc_optimistic_update_to_capella(pre: bellatrix.LightClientOptimisticUpdate) -> LightClientOptimisticUpdate: | ||
| return LightClientOptimisticUpdate( | ||
| attested_header=upgrade_lc_header_to_capella(pre.attested_header), | ||
| sync_aggregate=pre.sync_aggregate, | ||
| signature_slot=pre.signature_slot, | ||
| ) | ||
| ``` | ||
|
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| ### Upgrading the store | ||
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| Existing `LightClientStore` objects based on Altair MUST be upgraded to Capella before Capella based light client data can be processed. The `LightClientStore` upgrade MAY be performed before `CAPELLA_FORK_EPOCH`. | ||
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| ```python | ||
| def upgrade_lc_store_to_capella(pre: bellatrix.LightClientStore) -> LightClientStore: | ||
| if pre.best_valid_update is None: | ||
| best_valid_update = None | ||
| else: | ||
| best_valid_update = upgrade_lc_update_to_capella(pre.best_valid_update) | ||
| return LightClientStore( | ||
| finalized_header=upgrade_lc_header_to_capella(pre.finalized_header), | ||
| current_sync_committee=pre.current_sync_committee, | ||
| next_sync_committee=pre.next_sync_committee, | ||
| best_valid_update=best_valid_update, | ||
| optimistic_header=upgrade_lc_header_to_capella(pre.optimistic_header), | ||
| previous_max_active_participants=pre.previous_max_active_participants, | ||
| current_max_active_participants=pre.current_max_active_participants, | ||
| ) | ||
| ``` |
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| # Capella Light Client -- Full Node | ||
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| **Notice**: This document is a work-in-progress for researchers and implementers. | ||
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| ## Table of contents | ||
|
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| <!-- TOC --> | ||
| <!-- START doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> | ||
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| - [Introduction](#introduction) | ||
| - [Helper functions](#helper-functions) | ||
| - [`compute_merkle_proof_for_block_body`](#compute_merkle_proof_for_block_body) | ||
| - [Modified `block_to_light_client_header`](#modified-block_to_light_client_header) | ||
|
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| <!-- END doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- /TOC --> | ||
|
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| ## Introduction | ||
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| This upgrade adds information about the execution payload to light client data as part of the Capella upgrade. | ||
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| ## Helper functions | ||
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| ### `compute_merkle_proof_for_block_body` | ||
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| ```python | ||
| def compute_merkle_proof_for_block_body(body: BeaconBlockBody, | ||
| index: GeneralizedIndex) -> Sequence[Bytes32]: | ||
| ... | ||
| ``` | ||
|
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| ### Modified `block_to_light_client_header` | ||
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| ```python | ||
| def block_to_light_client_header(block: SignedBeaconBlock) -> LightClientHeader: | ||
| epoch = compute_epoch_at_slot(block.message.slot) | ||
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| if epoch >= CAPELLA_FORK_EPOCH: | ||
| payload = block.message.body.execution_payload | ||
| execution_header = ExecutionPayloadHeader( | ||
| parent_hash=payload.parent_hash, | ||
| fee_recipient=payload.fee_recipient, | ||
| state_root=payload.state_root, | ||
| receipts_root=payload.receipts_root, | ||
| logs_bloom=payload.logs_bloom, | ||
| prev_randao=payload.prev_randao, | ||
| block_number=payload.block_number, | ||
| gas_limit=payload.gas_limit, | ||
| gas_used=payload.gas_used, | ||
| timestamp=payload.timestamp, | ||
| extra_data=payload.extra_data, | ||
| base_fee_per_gas=payload.base_fee_per_gas, | ||
| block_hash=payload.block_hash, | ||
| transactions_root=hash_tree_root(payload.transactions), | ||
| withdrawals_root=hash_tree_root(payload.withdrawals), | ||
| ) | ||
| execution_branch = compute_merkle_proof_for_block_body(block.message.body, EXECUTION_PAYLOAD_INDEX) | ||
| else: | ||
| # Note that during fork transitions, `finalized_header` may still point to earlier forks. | ||
| # While Bellatrix blocks also contain an `ExecutionPayload` (minus `withdrawals_root`), | ||
| # it was not included in the corresponding light client data. To ensure compatibility | ||
| # with legacy data going through `upgrade_lc_header_to_capella`, leave out execution data. | ||
| execution_header = ExecutionPayloadHeader() | ||
| execution_branch = [Bytes32() for _ in range(floorlog2(EXECUTION_PAYLOAD_INDEX))] | ||
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| return LightClientHeader( | ||
| beacon=BeaconBlockHeader( | ||
| slot=block.message.slot, | ||
| proposer_index=block.message.proposer_index, | ||
| parent_root=block.message.parent_root, | ||
| state_root=block.message.state_root, | ||
| body_root=hash_tree_root(block.message.body), | ||
| ), | ||
| execution=execution_header, | ||
| execution_branch=execution_branch, | ||
| ) | ||
| ``` |
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| # Capella Light Client -- Networking | ||
|
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| **Notice**: This document is a work-in-progress for researchers and implementers. | ||
|
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| ## Table of contents | ||
|
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| <!-- TOC --> | ||
| <!-- START doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE --> | ||
|
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| - [Networking](#networking) | ||
| - [The gossip domain: gossipsub](#the-gossip-domain-gossipsub) | ||
| - [Topics and messages](#topics-and-messages) | ||
| - [Global topics](#global-topics) | ||
| - [`light_client_finality_update`](#light_client_finality_update) | ||
| - [`light_client_optimistic_update`](#light_client_optimistic_update) | ||
| - [The Req/Resp domain](#the-reqresp-domain) | ||
| - [Messages](#messages) | ||
| - [GetLightClientBootstrap](#getlightclientbootstrap) | ||
| - [LightClientUpdatesByRange](#lightclientupdatesbyrange) | ||
| - [GetLightClientFinalityUpdate](#getlightclientfinalityupdate) | ||
| - [GetLightClientOptimisticUpdate](#getlightclientoptimisticupdate) | ||
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| <!-- END doctoc generated TOC please keep comment here to allow auto update --> | ||
| <!-- /TOC --> | ||
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| ## Networking | ||
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| The [Altair light client networking specification](../../altair/light-client/p2p-interface.md) is extended to exchange [Capella light client data](./sync-protocol.md). | ||
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| ### The gossip domain: gossipsub | ||
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| #### Topics and messages | ||
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| ##### Global topics | ||
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| ###### `light_client_finality_update` | ||
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| [0]: # (eth2spec: skip) | ||
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| | `fork_version` | Message SSZ type | | ||
| | ------------------------------------------------------ | ------------------------------------- | | ||
| | `GENESIS_FORK_VERSION` | n/a | | ||
| | `ALTAIR_FORK_VERSION` through `BELLATRIX_FORK_VERSION` | `altair.LightClientFinalityUpdate` | | ||
| | `CAPELLA_FORK_VERSION` and later | `capella.LightClientFinalityUpdate` | | ||
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| ###### `light_client_optimistic_update` | ||
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| [0]: # (eth2spec: skip) | ||
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| | `fork_version` | Message SSZ type | | ||
| | ------------------------------------------------------ | ------------------------------------- | | ||
| | `GENESIS_FORK_VERSION` | n/a | | ||
| | `ALTAIR_FORK_VERSION` through `BELLATRIX_FORK_VERSION` | `altair.LightClientOptimisticUpdate` | | ||
| | `CAPELLA_FORK_VERSION` and later | `capella.LightClientOptimisticUpdate` | | ||
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| ### The Req/Resp domain | ||
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| #### Messages | ||
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| ##### GetLightClientBootstrap | ||
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| [0]: # (eth2spec: skip) | ||
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| | `fork_version` | Response SSZ type | | ||
| | ------------------------------------------------------ | ------------------------------------- | | ||
| | `GENESIS_FORK_VERSION` | n/a | | ||
| | `ALTAIR_FORK_VERSION` through `BELLATRIX_FORK_VERSION` | `altair.LightClientBootstrap` | | ||
| | `CAPELLA_FORK_VERSION` and later | `capella.LightClientBootstrap` | | ||
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| ##### LightClientUpdatesByRange | ||
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| [0]: # (eth2spec: skip) | ||
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| | `fork_version` | Response chunk SSZ type | | ||
| | ------------------------------------------------------ | ------------------------------------- | | ||
| | `GENESIS_FORK_VERSION` | n/a | | ||
| | `ALTAIR_FORK_VERSION` through `BELLATRIX_FORK_VERSION` | `altair.LightClientUpdate` | | ||
| | `CAPELLA_FORK_VERSION` and later | `capella.LightClientUpdate` | | ||
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| ##### GetLightClientFinalityUpdate | ||
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| [0]: # (eth2spec: skip) | ||
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| | `fork_version` | Response SSZ type | | ||
| | ------------------------------------------------------ | ------------------------------------- | | ||
| | `GENESIS_FORK_VERSION` | n/a | | ||
| | `ALTAIR_FORK_VERSION` through `BELLATRIX_FORK_VERSION` | `altair.LightClientFinalityUpdate` | | ||
| | `CAPELLA_FORK_VERSION` and later | `capella.LightClientFinalityUpdate` | | ||
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| ##### GetLightClientOptimisticUpdate | ||
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| [0]: # (eth2spec: skip) | ||
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| | `fork_version` | Response SSZ type | | ||
| | ------------------------------------------------------ | ------------------------------------- | | ||
| | `GENESIS_FORK_VERSION` | n/a | | ||
| | `ALTAIR_FORK_VERSION` through `BELLATRIX_FORK_VERSION` | `altair.LightClientOptimisticUpdate` | | ||
| | `CAPELLA_FORK_VERSION` and later | `capella.LightClientOptimisticUpdate` | |
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