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Runtime API for historical validation code (#1893)

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* fix: ensure candidate validation gets code based on occupied core assumption

* guide: runtime API for historical validation code

* add historical runtime API

* integrate into runtime API subsystem

* remove blocked TODO

* fix service build: enable notifications protocol only under real overseer

* Update node/subsystem/src/messages.rs

Co-authored-by: Sergei Shulepov <sergei@parity.io>

* fix compilation

Co-authored-by: Robert Habermeier <robert@Roberts-MacBook-Pro.local>
Co-authored-by: Sergei Shulepov <sergei@parity.io>
This commit is contained in:
Robert Habermeier
2020-11-02 12:19:53 -06:00
committed by GitHub
parent a3e58350bb
commit 1f4121c444
13 changed files with 152 additions and 7 deletions
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polkadot/roadmap/implementers-guide/src/node/approval/approval-voting.md
+1 -1
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@@ -232,7 +232,7 @@ On receiving an `ApprovedAncestor(Hash, BlockNumber, response_channel)`:
#### `launch_approval(SessionIndex, CandidateDescriptor, ValidatorIndex, block_hash, candidate_index)`:
* Extract the public key of the `ValidatorIndex` from the `SessionInfo` for the session.
* Issue an `AvailabilityRecoveryMessage::RecoverAvailableData(candidate, session_index, response_sender)`
* Load the historical validation code of the parachain (TODO: https://github.com/paritytech/polkadot/issues/1877)
* Load the historical validation code of the parachain by dispatching a `RuntimeApiRequest::HistoricalValidationCode(`descriptor.para_id`, `descriptor.relay_parent`)` against the state of `block_hash`.
* Spawn a background task with a clone of `approval_vote_tx`
* Wait for the available data
* Issue a `CandidateValidationMessage::ValidateFromExhaustive` message
polkadot/roadmap/implementers-guide/src/runtime-api/historical_validation_code.md
+7
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@@ -0,0 +1,7 @@
# Historical Validation Code
Fetch the historical validation code used by a para for candidates executed in the context of a given block height in the current chain.
```rust
fn historical_validation_code(at: Block, para_id: ParaId, context_height: BlockNumber) -> Option<ValidationCode>;
```
polkadot/roadmap/implementers-guide/src/types/overseer-protocol.md
+3 -1
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@@ -409,7 +409,9 @@ enum RuntimeApiRequest {
SessionIndex(ResponseChannel<SessionIndex>),
/// Get the validation code for a specific para, using the given occupied core assumption.
ValidationCode(ParaId, OccupiedCoreAssumption, ResponseChannel<Option<ValidationCode>>),
/// Get the persisted validation data at the state of a given block for a specific para,
/// Fetch the historical validation code used by a para for candidates executed in
/// the context of a given block height in the current chain.
HistoricalValidationCode(ParaId, BlockNumber, ResponseChannel<Option<ValidationCode>>),
/// with the given occupied core assumption.
PersistedValidationData(
ParaId,