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Message lane pallet parameters + updatable conversion rate (#728)

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* message lane pallet parameters

* updated comment

* Update modules/message-lane/src/lib.rs

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>

* fmt

Co-authored-by: Tomasz Drwięga <tomusdrw@users.noreply.github.com>
This commit is contained in:
Svyatoslav Nikolsky
2021-02-18 10:15:12 +03:00
committed by Bastian Köcher
parent e8b5a53eed
commit 1bf2eb1ab5
7 changed files with 211 additions and 14 deletions
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bridges/bin/millau/runtime/src/rialto_messages.rs
+28 -3
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@@ -21,17 +21,25 @@ use crate::Runtime;
use bp_message_lane::{
source_chain::TargetHeaderChain,
target_chain::{ProvedMessages, SourceHeaderChain},
InboundLaneData, LaneId, Message, MessageNonce,
InboundLaneData, LaneId, Message, MessageNonce, Parameter as MessageLaneParameter,
};
use bp_runtime::{InstanceId, RIALTO_BRIDGE_INSTANCE};
use bridge_runtime_common::messages::{self, ChainWithMessageLanes, MessageBridge};
use codec::{Decode, Encode};
use frame_support::{
parameter_types,
weights::{DispatchClass, Weight, WeightToFeePolynomial},
RuntimeDebug,
};
use sp_core::storage::StorageKey;
use sp_runtime::{FixedPointNumber, FixedU128};
use sp_std::{convert::TryFrom, ops::RangeInclusive};
parameter_types! {
/// Rialto to Millau conversion rate. Initially we treat both tokens as equal.
storage RialtoToMillauConversionRate: FixedU128 = 1.into();
}
/// Storage key of the Millau -> Rialto message in the runtime storage.
pub fn message_key(lane: &LaneId, nonce: MessageNonce) -> StorageKey {
pallet_message_lane::storage_keys::message_key::<Runtime, <Millau as ChainWithMessageLanes>::MessageLaneInstance>(
@@ -145,8 +153,8 @@ impl MessageBridge for WithRialtoMessageBridge {
}
fn bridged_balance_to_this_balance(bridged_balance: bp_rialto::Balance) -> bp_millau::Balance {
// 1:1 conversion that will probably change in the future
bridged_balance as _
bp_millau::Balance::try_from(RialtoToMillauConversionRate::get().saturating_mul_int(bridged_balance))
.unwrap_or(bp_millau::Balance::MAX)
}
}
@@ -227,3 +235,20 @@ impl SourceHeaderChain<bp_rialto::Balance> for Rialto {
messages::target::verify_messages_proof::<WithRialtoMessageBridge, Runtime>(proof, messages_count)
}
}
/// Millau -> Rialto message lane pallet parameters.
#[derive(RuntimeDebug, Clone, Encode, Decode, PartialEq, Eq)]
pub enum MillauToRialtoMessageLaneParameter {
/// The conversion formula we use is: `MillauTokens = RialtoTokens * conversion_rate`.
RialtoToMillauConversionRate(FixedU128),
}
impl MessageLaneParameter for MillauToRialtoMessageLaneParameter {
fn save(&self) {
match *self {
MillauToRialtoMessageLaneParameter::RialtoToMillauConversionRate(ref conversion_rate) => {
RialtoToMillauConversionRate::set(conversion_rate)
}
}
}
}