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Estimate message fee api (#600)

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* estimate_message_delivery_and_dispatch_fee runtime API

* auto-determine message fees in relay

* remove fee argument from relay calls

* Fix import of weight contant

Co-authored-by: Hernando Castano <castano.ha@gmail.com>
This commit is contained in:
Svyatoslav Nikolsky
2021-01-04 23:54:51 +03:00
committed by Bastian Köcher
parent 0624fd0d94
commit 9fbb922766
9 changed files with 144 additions and 35 deletions
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bridges/primitives/millau/src/lib.rs
+18 -2
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@@ -26,7 +26,7 @@ use bp_message_lane::{LaneId, MessageNonce, UnrewardedRelayersState};
use bp_runtime::Chain;
use frame_support::{
weights::{constants::WEIGHT_PER_SECOND, DispatchClass, Weight},
RuntimeDebug,
Parameter, RuntimeDebug,
};
use frame_system::limits;
use sp_core::Hasher as HasherT;
@@ -191,6 +191,9 @@ pub const IS_KNOWN_MILLAU_BLOCK_METHOD: &str = "MillauHeaderApi_is_known_block";
/// Name of the `MillauHeaderApi::incomplete_headers` runtime method.
pub const INCOMPLETE_MILLAU_HEADERS_METHOD: &str = "MillauHeaderApi_incomplete_headers";
/// Name of the `ToMillauOutboundLaneApi::estimate_message_delivery_and_dispatch_fee` runtime method.
pub const TO_MILLAU_ESTIMATE_MESSAGE_FEE_METHOD: &str =
"ToMillauOutboundLaneApi_estimate_message_delivery_and_dispatch_fee";
/// Name of the `ToMillauOutboundLaneApi::messages_dispatch_weight` runtime method.
pub const TO_MILLAU_MESSAGES_DISPATCH_WEIGHT_METHOD: &str = "ToMillauOutboundLaneApi_messages_dispatch_weight";
/// Name of the `ToMillauOutboundLaneApi::latest_received_nonce` runtime method.
@@ -235,7 +238,20 @@ sp_api::decl_runtime_apis! {
///
/// This API is implemented by runtimes that are sending messages to Millau chain, not the
/// Millau runtime itself.
pub trait ToMillauOutboundLaneApi {
pub trait ToMillauOutboundLaneApi<OutboundMessageFee: Parameter, OutboundPayload: Parameter> {
/// Estimate message delivery and dispatch fee that needs to be paid by the sender on
/// this chain.
///
/// Returns `None` if message is too expensive to be sent to Millau from this chain.
///
/// Please keep in mind that this method returns lowest message fee required for message
/// to be accepted to the lane. It may be good idea to pay a bit over this price to account
/// future exchange rate changes and guarantee that relayer would deliver your message
/// to the target chain.
fn estimate_message_delivery_and_dispatch_fee(
lane_id: LaneId,
payload: OutboundPayload,
) -> Option<OutboundMessageFee>;
/// Returns total dispatch weight and encoded payload size of all messages in given inclusive range.
///
/// If some (or all) messages are missing from the storage, they'll also will