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Remove redundant data from InboundLaneData (#638)

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* Remove latest_*_nonce.

* cargo fmt --all

* Fix tests.

* cargo fmt --all

* Fix benchmarking.

* Update docs.
This commit is contained in:
Tomasz Drwięga
2021-01-12 22:27:53 +01:00
committed by Bastian Köcher
parent 58fbd8cb49
commit e6fc67c705
4 changed files with 78 additions and 63 deletions
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bridges/primitives/message-lane/src/lib.rs
+33 -13
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@@ -74,34 +74,54 @@ pub struct Message<Fee> {
/// Inbound lane data.
#[derive(Encode, Decode, Clone, RuntimeDebug, PartialEq, Eq)]
pub struct InboundLaneData<RelayerId> {
/// Identifiers of relayers and messages that they have delivered (ordered by message nonce).
/// It is guaranteed to have at most N entries, where N is configured at module level. If
/// there are N entries in this vec, then:
/// Identifiers of relayers and messages that they have delivered to this lane (ordered by message nonce).
///
/// This serves as a helper storage item, to allow the source chain to easily pay rewards
/// to the relayers who succesfuly delivered messages to the target chain (inbound lane).
///
/// It is guaranteed to have at most N entries, where N is configured at the module level.
/// If there are N entries in this vec, then:
/// 1) all incoming messages are rejected if they're missing corresponding `proof-of(outbound-lane.state)`;
/// 2) all incoming messages are rejected if `proof-of(outbound-lane.state).latest_received_nonce` is
/// equal to `this.latest_confirmed_nonce`.
/// Given what is said above, all nonces in this queue are in range (latest_confirmed_nonce; latest_received_nonce].
/// 2) all incoming messages are rejected if `proof-of(outbound-lane.state).last_delivered_nonce` is
/// equal to `self.last_confirmed_nonce`.
/// Given what is said above, all nonces in this queue are in range:
/// `(self.last_confirmed_nonce; self.last_delivered_nonce()]`.
///
/// When a relayer sends a single message, both of MessageNonces are the same.
/// When relayer sends messages in a batch, the first arg is the lowest nonce, second arg the highest nonce.
/// Multiple dispatches from the same relayer one are allowed.
/// Multiple dispatches from the same relayer are allowed.
pub relayers: VecDeque<(MessageNonce, MessageNonce, RelayerId)>,
/// Nonce of latest message that we have received from bridged chain.
pub latest_received_nonce: MessageNonce,
/// Nonce of latest message that has been confirmed to the bridged chain.
pub latest_confirmed_nonce: MessageNonce,
/// Nonce of the last message that
/// a) has been delivered to the target (this) chain and
/// b) the delivery has been confirmed on the source chain
///
/// that the target chain knows of.
///
/// This value is updated indirectly when an `OutboundLane` state of the source
/// chain is received alongside with new messages delivery.
pub last_confirmed_nonce: MessageNonce,
}
impl<RelayerId> Default for InboundLaneData<RelayerId> {
fn default() -> Self {
InboundLaneData {
relayers: VecDeque::new(),
latest_received_nonce: 0,
latest_confirmed_nonce: 0,
last_confirmed_nonce: 0,
}
}
}
impl<RelayerId> InboundLaneData<RelayerId> {
/// Nonce of the last message that has been delivered to this (target) chain.
pub fn last_delivered_nonce(&self) -> MessageNonce {
self.relayers
.back()
.map(|(_, last_nonce, _)| *last_nonce)
.unwrap_or(self.last_confirmed_nonce)
}
}
/// Gist of `InboundLaneData::relayers` field used by runtime APIs.
#[derive(Clone, Default, Encode, Decode, RuntimeDebug, PartialEq, Eq)]
pub struct UnrewardedRelayersState {