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Integrate DMP into PersistentValidationData (#1666)

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This commit is contained in:
Sergei Shulepov
2020-09-02 15:51:01 +02:00
committed by GitHub
parent 1ec4c452d0
commit 7ba20347d8
3 changed files with 38 additions and 1 deletions
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polkadot/roadmap/implementers-guide/src/runtime/router.md
+24 -1
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@@ -23,8 +23,23 @@ NeedsDispatch: Vec<ParaId>;
/// This is the para that gets will get dispatched first during the next upward dispatchable queue
/// execution round.
NextDispatchRoundStartWith: Option<ParaId>;
```
### Downward Message Passing (DMP)
Storage layout required for implementation of DMP.
```rust
/// The downward messages addressed for a certain para.
DownwardMessageQueues: map ParaId => Vec<DownwardMessage>;
DownwardMessageQueues: map ParaId => Vec<InboundDownwardMessage>;
/// A mapping that stores the downward message queue MQC head for each para.
///
/// Each link in this chain has a form:
/// `(prev_head, B, H(M))`, where
/// - `prev_head`: is the previous head hash.
/// - `B`: is the relay-chain block number in which a message was appended.
/// - `H(M)`: is the hash of the message being appended.
DownwardMessageQueueHeads: map ParaId => Option<Hash>;
```
### HRMP
@@ -236,12 +251,20 @@ any of dispatchables return an error.
1. If `RelayDispatchQueues` for `P` became empty, remove `P` from `NeedsDispatch`.
1. If `NeedsDispatch` became empty then finish processing and set `NextDispatchRoundStartWith` to `None`.
Utility routines.
`queue_downward_message(P: ParaId, M: DownwardMessage)`:
1. Wrap `M` into `InboundDownwardMessage` using the current block number for `sent_at`.
1. Obtain a new MQC link for the resulting `InboundDownwardMessage` and replace `DownwardMessageQueueHeads` for `P` with the resulting hash.
1. Add the resulting `InboundDownwardMessage` into `DownwardMessageQueues` for `P`.
## Session Change
1. Drain `OutgoingParas`. For each `P` happened to be in the list:
1. Remove all inbound channels of `P`, i.e. `(_, P)`,
1. Remove all outbound channels of `P`, i.e. `(P, _)`,
1. Remove all `DownwardMessageQueues` of `P`.
1. Remove `DownwardMessageQueueHeads` for `P`.
1. Remove `RelayDispatchQueueSize` of `P`.
1. Remove `RelayDispatchQueues` of `P`.
1. Remove `HrmpOpenChannelRequestCount` for `P`