XCM revamp (#2836)

* Remove unused relaying XCM * Aggregate HRMP (XCMP/HMP) messages. Payloads for spambot. * Revert lock * Fix * Broken example * Introduce fee payment mechanics into XCM. * Weight limitations on XCM execution * Mock environment for tests and the first test * Tests for XCM and a few refactors. * Remove code that's not ready * Fix for an XCM and an additional test * Query response system * XCMP message dispatch system reimagining - Moved most of the logic into xcm-handler pallet - Altered the outgoing XCMP API from push to pull - Changed underlying outgoing queue data structures to avoid multi-page read/writes - Introduced queuing for incoming messages - Introduced signal messages as a flow-control sub-stream - Introduced flow-control with basic threshold back-pressure - Introduced overall weight limitation on messages executed - Additonal alterations to XCM APIs for the new system * Some build fixes * Remove the Encode bounds sprayed around * More faff * Fix bounds amek use latest scale codec. * remove println * fixes * Fix XcmExecutor Tests * Fix XCM bounds using derivative crate * Refactor names of XcmGeneric &c into Xcm * Repot the xcm-executor into xcm-builder * Docs * Docs * Fixes * Update xcm/src/lib.rs Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com> * Fixes * Docs * Update runtime/parachains/src/ump.rs Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com> * Docs * Fixes * Fixes * Fixes * Docs * Fixes * Fixes * Introduce transfer_asset specialisation. * Fixes * Fixes Co-authored-by: Shawn Tabrizi <shawntabrizi@gmail.com>
2026-05-30 18:41:03 +00:00 · 2021-04-07 22:38:29 +02:00
parent 8eae0fa443
commit adc238ad86
37 changed files with 2436 additions and 574 deletions
@@ -0,0 +1,90 @@
+// Copyright 2020 Parity Technologies (UK) Ltd.
+// This file is part of Polkadot.
+
+// Polkadot is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Polkadot is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Polkadot.  If not, see <http://www.gnu.org/licenses/>.
+
+use sp_std::{result::Result, marker::PhantomData};
+use xcm::v0::{Xcm, Order, MultiLocation};
+use frame_support::{ensure, traits::Contains, weights::Weight};
+use xcm_executor::traits::{OnResponse, ShouldExecute};
+
+pub struct TakeWeightCredit;
+impl ShouldExecute for TakeWeightCredit {
+	fn should_execute<Call>(
+		_origin: &MultiLocation,
+		_top_level: bool,
+		_message: &Xcm<Call>,
+		shallow_weight: Weight,
+		weight_credit: &mut Weight,
+	) -> Result<(), ()> {
+		*weight_credit = weight_credit.checked_sub(shallow_weight).ok_or(())?;
+		Ok(())
+	}
+}
+
+pub struct AllowTopLevelPaidExecutionFrom<T>(PhantomData<T>);
+impl<T: Contains<MultiLocation>> ShouldExecute for AllowTopLevelPaidExecutionFrom<T> {
+	fn should_execute<Call>(
+		origin: &MultiLocation,
+		top_level: bool,
+		message: &Xcm<Call>,
+		shallow_weight: Weight,
+		_weight_credit: &mut Weight,
+	) -> Result<(), ()> {
+		ensure!(T::contains(origin), ());
+		ensure!(top_level, ());
+		match message {
+			Xcm::TeleportAsset { effects, .. }
+			| Xcm::WithdrawAsset { effects, ..}
+			| Xcm::ReserveAssetDeposit { effects, ..}
+			if matches!(
+					effects.first(),
+					Some(Order::BuyExecution { debt, ..}) if *debt >= shallow_weight
+				)
+			=> Ok(()),
+			_ => Err(()),
+		}
+	}
+}
+
+pub struct AllowUnpaidExecutionFrom<T>(PhantomData<T>);
+impl<T: Contains<MultiLocation>> ShouldExecute for AllowUnpaidExecutionFrom<T> {
+	fn should_execute<Call>(
+		origin: &MultiLocation,
+		_top_level: bool,
+		_message: &Xcm<Call>,
+		_shallow_weight: Weight,
+		_weight_credit: &mut Weight,
+	) -> Result<(), ()> {
+		ensure!(T::contains(origin), ());
+		Ok(())
+	}
+}
+
+pub struct AllowKnownQueryResponses<ResponseHandler>(PhantomData<ResponseHandler>);
+impl<ResponseHandler: OnResponse> ShouldExecute for AllowKnownQueryResponses<ResponseHandler> {
+	fn should_execute<Call>(
+		origin: &MultiLocation,
+		_top_level: bool,
+		message: &Xcm<Call>,
+		_shallow_weight: Weight,
+		_weight_credit: &mut Weight,
+	) -> Result<(), ()> {
+		match message {
+			Xcm::QueryResponse { query_id, .. } if ResponseHandler::expecting_response(origin, *query_id)
+			=> Ok(()),
+			_ => Err(()),
+		}
+	}
+}