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 11:41:02 +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 +1,74 @@
+// 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 alloc::vec::Vec;
+use parity_scale_codec::{Encode, Decode};
+
+#[derive(Encode, Decode)]
+#[codec(encode_bound())]
+#[codec(decode_bound())]
+pub struct DoubleEncoded<T> {
+	encoded: Vec<u8>,
+	#[codec(skip)]
+	decoded: Option<T>,
+}
+
+impl<T> Clone for DoubleEncoded<T> {
+	fn clone(&self) -> Self { Self { encoded: self.encoded.clone(), decoded: None } }
+}
+impl<T> Eq for DoubleEncoded<T> {
+}
+impl<T> PartialEq for DoubleEncoded<T> {
+	fn eq(&self, other: &Self) -> bool { self.encoded.eq(&other.encoded) }
+}
+impl<T> core::fmt::Debug for DoubleEncoded<T> {
+	fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { self.encoded.fmt(f) }
+}
+
+impl<T> From<Vec<u8>> for DoubleEncoded<T> {
+	fn from(encoded: Vec<u8>) -> Self {
+		Self { encoded, decoded: None }
+	}
+}
+
+impl<T> DoubleEncoded<T> {
+	pub fn into<S>(self) -> DoubleEncoded<S> { DoubleEncoded::from(self) }
+	pub fn from<S>(e: DoubleEncoded<S>) -> Self {
+		Self {
+			encoded: e.encoded,
+			decoded: None,
+		}
+	}
+	pub fn as_ref(&self) -> Option<&T> {
+		self.decoded.as_ref()
+	}
+}
+
+impl<T: Decode> DoubleEncoded<T> {
+	pub fn ensure_decoded(&mut self) -> Result<&T, ()> {
+		if self.decoded.is_none() {
+			self.decoded = T::decode(&mut &self.encoded[..]).ok();
+		}
+		self.decoded.as_ref().ok_or(())
+	}
+	pub fn take_decoded(&mut self) -> Result<T, ()> {
+		self.decoded.take().or_else(|| T::decode(&mut &self.encoded[..]).ok()).ok_or(())
+	}
+	pub fn try_into(mut self) -> Result<T, ()> {
+		self.ensure_decoded()?;
+		self.decoded.ok_or(())
+	}
+}