Revert "Fix max-size messages at test chains (#2064)" (#2077)

This reverts commit f904623c65fbad542a878133c612b1f8782f47d1.

bridges/bin/runtime-common/src/lib.rs

@@ -159,21 +159,7 @@ pub enum CustomNetworkId {
 	RialtoParachain,
 }
 
-impl TryFrom<bp_runtime::ChainId> for CustomNetworkId {
-	type Error = ();
-
-	fn try_from(chain: bp_runtime::ChainId) -> Result<Self, Self::Error> {
-		Ok(match chain {
-			bp_runtime::MILLAU_CHAIN_ID => Self::Millau,
-			bp_runtime::RIALTO_CHAIN_ID => Self::Rialto,
-			bp_runtime::RIALTO_PARACHAIN_CHAIN_ID => Self::RialtoParachain,
-			_ => return Err(()),
-		})
-	}
-}
-
 impl CustomNetworkId {
-	/// Converts self to XCM' network id.
 	pub const fn as_network_id(&self) -> NetworkId {
 		match *self {
 			CustomNetworkId::Millau => NetworkId::Kusama,

bridges/relays/bin-substrate/Cargo.toml

@@ -49,9 +49,6 @@ relay-utils = { path = "../utils" }
 relay-westend-client = { path = "../client-westend" }
 relay-wococo-client = { path = "../client-wococo" }
 rialto-runtime = { path = "../../bin/rialto/runtime" }
-# we are not using this runtime to craft callsour transactions, but we still need it
-# to prepare large XCM messages
-rialto-parachain-runtime = { path = "../../bin/rialto-parachain/runtime" }
 substrate-relay-helper = { path = "../lib-substrate-relay" }
 
 # Substrate Dependencies
@@ -65,8 +62,8 @@ polkadot-parachain = { git = "https://github.com/paritytech/polkadot", branch =
 polkadot-primitives = { git = "https://github.com/paritytech/polkadot", branch = "master" }
 polkadot-runtime-common = { git = "https://github.com/paritytech/polkadot", branch = "master" }
 polkadot-runtime-parachains = { git = "https://github.com/paritytech/polkadot", branch = "master" }
-xcm = { git = "https://github.com/paritytech/polkadot", branch = "master" }
-xcm-executor = { git = "https://github.com/paritytech/polkadot", branch = "master" }
+xcm = { git = "https://github.com/paritytech/polkadot", branch = "master", default-features = false }
+
 
 [dev-dependencies]
 bp-test-utils = { path = "../../primitives/test-utils" }

bridges/relays/bin-substrate/src/chains/millau.rs

@@ -17,36 +17,11 @@
 //! Millau chain specification for CLI.
 
 use crate::cli::{encode_message::CliEncodeMessage, CliChain};
-use bp_runtime::{ChainId, EncodedOrDecodedCall, RIALTO_CHAIN_ID, RIALTO_PARACHAIN_CHAIN_ID};
-use bridge_runtime_common::CustomNetworkId;
+use bp_runtime::EncodedOrDecodedCall;
 use relay_millau_client::Millau;
 use relay_substrate_client::SimpleRuntimeVersion;
-use xcm_executor::traits::ExportXcm;
 
 impl CliEncodeMessage for Millau {
-	fn encode_wire_message(
-		target: ChainId,
-		at_target_xcm: xcm::v3::Xcm<()>,
-	) -> anyhow::Result<Vec<u8>> {
-		let target = match target {
-			RIALTO_CHAIN_ID => CustomNetworkId::Rialto.as_network_id(),
-			RIALTO_PARACHAIN_CHAIN_ID => CustomNetworkId::RialtoParachain.as_network_id(),
-			_ => return Err(anyhow::format_err!("Unsupported target chain: {:?}", target)),
-		};
-
-		Ok(millau_runtime::xcm_config::ToRialtoOrRialtoParachainSwitchExporter::validate(
-			target,
-			0,
-			&mut Some(Self::dummy_universal_source()?),
-			&mut Some(target.into()),
-			&mut Some(at_target_xcm),
-		)
-		.map_err(|e| anyhow::format_err!("Failed to prepare outbound message: {:?}", e))?
-		.0
-		 .1
-		 .0)
-	}
-
 	fn encode_execute_xcm(
 		message: xcm::VersionedXcm<Self::Call>,
 	) -> anyhow::Result<EncodedOrDecodedCall<Self::Call>> {

bridges/relays/bin-substrate/src/chains/rialto.rs

@@ -17,34 +17,11 @@
 //! Rialto chain specification for CLI.
 
 use crate::cli::{encode_message::CliEncodeMessage, CliChain};
-use bp_runtime::{ChainId, EncodedOrDecodedCall, MILLAU_CHAIN_ID};
-use bridge_runtime_common::CustomNetworkId;
+use bp_runtime::EncodedOrDecodedCall;
 use relay_rialto_client::Rialto;
 use relay_substrate_client::SimpleRuntimeVersion;
-use xcm_executor::traits::ExportXcm;
 
 impl CliEncodeMessage for Rialto {
-	fn encode_wire_message(
-		target: ChainId,
-		at_target_xcm: xcm::v3::Xcm<()>,
-	) -> anyhow::Result<Vec<u8>> {
-		let target = match target {
-			MILLAU_CHAIN_ID => CustomNetworkId::Millau.as_network_id(),
-			_ => return Err(anyhow::format_err!("Unsupported target chian: {:?}", target)),
-		};
-
-		Ok(rialto_runtime::millau_messages::ToMillauBlobExporter::validate(
-			target,
-			0,
-			&mut Some(Self::dummy_universal_source()?),
-			&mut Some(target.into()),
-			&mut Some(at_target_xcm),
-		)
-		.map_err(|e| anyhow::format_err!("Failed to prepare outbound message: {:?}", e))?
-		.0
-		 .0)
-	}
-
 	fn encode_execute_xcm(
 		message: xcm::VersionedXcm<Self::Call>,
 	) -> anyhow::Result<EncodedOrDecodedCall<Self::Call>> {

bridges/relays/bin-substrate/src/chains/rialto_parachain.rs

@@ -17,34 +17,11 @@
 //! Rialto parachain specification for CLI.
 
 use crate::cli::{encode_message::CliEncodeMessage, CliChain};
-use bp_runtime::{ChainId, EncodedOrDecodedCall, MILLAU_CHAIN_ID};
-use bridge_runtime_common::CustomNetworkId;
+use bp_runtime::EncodedOrDecodedCall;
 use relay_rialto_parachain_client::RialtoParachain;
 use relay_substrate_client::SimpleRuntimeVersion;
-use xcm_executor::traits::ExportXcm;
 
 impl CliEncodeMessage for RialtoParachain {
-	fn encode_wire_message(
-		target: ChainId,
-		at_target_xcm: xcm::v3::Xcm<()>,
-	) -> anyhow::Result<Vec<u8>> {
-		let target = match target {
-			MILLAU_CHAIN_ID => CustomNetworkId::Millau.as_network_id(),
-			_ => return Err(anyhow::format_err!("Unsupported target chain: {:?}", target)),
-		};
-
-		Ok(rialto_parachain_runtime::millau_messages::ToMillauBlobExporter::validate(
-			target,
-			0,
-			&mut Some(Self::dummy_universal_source()?),
-			&mut Some(target.into()),
-			&mut Some(at_target_xcm),
-		)
-		.map_err(|e| anyhow::format_err!("Failed to prepare outbound message: {:?}", e))?
-		.0
-		 .0)
-	}
-
 	fn encode_execute_xcm(
 		message: xcm::VersionedXcm<Self::Call>,
 	) -> anyhow::Result<EncodedOrDecodedCall<Self::Call>> {

bridges/relays/bin-substrate/src/cli/encode_message.rs

@@ -15,13 +15,11 @@
 // along with Parity Bridges Common.  If not, see <http://www.gnu.org/licenses/>.
 
 use crate::cli::{ExplicitOrMaximal, HexBytes};
-use bp_runtime::{ChainId, EncodedOrDecodedCall};
-use bridge_runtime_common::CustomNetworkId;
+use bp_runtime::EncodedOrDecodedCall;
 use codec::Encode;
 use frame_support::weights::Weight;
 use relay_substrate_client::Chain;
 use structopt::StructOpt;
-use xcm::latest::prelude::*;
 
 /// All possible messages that may be delivered to generic Substrate chain.
 ///
@@ -45,31 +43,6 @@ pub enum Message {
 pub type RawMessage = Vec<u8>;
 
 pub trait CliEncodeMessage: Chain {
-	/// Returns dummy `AccountId32` universal source given this network id.
-	fn dummy_universal_source() -> anyhow::Result<xcm::v3::Junctions> {
-		use xcm::v3::prelude::*;
-
-		let this_network = CustomNetworkId::try_from(Self::ID)
-			.map(|n| n.as_network_id())
-			.map_err(|_| anyhow::format_err!("Unsupported chain: {:?}", Self::ID))?;
-		let this_location: InteriorMultiLocation = this_network.into();
-
-		let origin = MultiLocation {
-			parents: 0,
-			interior: X1(AccountId32 { network: Some(this_network), id: [0u8; 32] }),
-		};
-		let universal_source = this_location
-			.within_global(origin)
-			.map_err(|e| anyhow::format_err!("Invalid location: {:?}", e))?;
-
-		Ok(universal_source)
-	}
-	/// Returns XCM blob that is passed to the `send_message` function of the messages pallet
-	/// and then is sent over the wire.
-	fn encode_wire_message(
-		target: ChainId,
-		at_target_xcm: xcm::v3::Xcm<()>,
-	) -> anyhow::Result<Vec<u8>>;
 	/// Encode an `execute` XCM call of the XCM pallet.
 	fn encode_execute_xcm(
 		message: xcm::VersionedXcm<Self::Call>,
@@ -83,42 +56,41 @@ pub trait CliEncodeMessage: Chain {
 }
 
 /// Encode message payload passed through CLI flags.
-pub(crate) fn encode_message<Source: CliEncodeMessage, Target: Chain>(
+pub(crate) fn encode_message<Source: Chain, Target: Chain>(
 	message: &Message,
 ) -> anyhow::Result<RawMessage> {
 	Ok(match message {
 		Message::Raw { ref data } => data.0.clone(),
 		Message::Sized { ref size } => {
-			let destination = CustomNetworkId::try_from(Target::ID)
-				.map(|n| n.as_network_id())
-				.map_err(|_| anyhow::format_err!("Unsupported target chain: {:?}", Target::ID))?;
-			let expected_size = match *size {
+			let expected_xcm_size = match *size {
 				ExplicitOrMaximal::Explicit(size) => size,
 				ExplicitOrMaximal::Maximal => compute_maximal_message_size(
 					Source::max_extrinsic_size(),
 					Target::max_extrinsic_size(),
 				),
-			} as usize;
-
-			let at_target_xcm = vec![xcm::v3::Instruction::ClearOrigin; expected_size].into();
-			let at_target_xcm_size =
-				Source::encode_wire_message(Target::ID, at_target_xcm)?.encoded_size();
-			let at_target_xcm_overhead = at_target_xcm_size.saturating_sub(expected_size);
-			let at_target_xcm = vec![
-				xcm::v3::Instruction::ClearOrigin;
-				expected_size.saturating_sub(at_target_xcm_overhead)
-			]
-			.into();
-
-			xcm::VersionedXcm::<()>::V3(
-				vec![ExportMessage {
-					network: destination,
-					destination: destination.into(),
-					xcm: at_target_xcm,
-				}]
-				.into(),
-			)
-			.encode()
+			};
+
+			// there's no way to craft XCM of the given size - we'll be using `ExpectPallet`
+			// instruction, which has byte vector inside
+			let mut current_vec_size = expected_xcm_size;
+			let xcm = loop {
+				let xcm = xcm::VersionedXcm::<()>::V3(
+					vec![xcm::v3::Instruction::ExpectPallet {
+						index: 0,
+						name: vec![42; current_vec_size as usize],
+						module_name: vec![],
+						crate_major: 0,
+						min_crate_minor: 0,
+					}]
+					.into(),
+				);
+				if xcm.encode().len() <= expected_xcm_size as usize {
+					break xcm
+				}
+
+				current_vec_size -= 1;
+			};
+			xcm.encode()
 		},
 	})
 }
@@ -151,21 +123,13 @@ mod tests {
 	use relay_millau_client::Millau;
 	use relay_rialto_client::Rialto;
 
-	fn approximate_message_size<Source: CliEncodeMessage>(xcm_msg_len: usize) -> usize {
-		xcm_msg_len + Source::dummy_universal_source().unwrap().encoded_size()
-	}
-
 	#[test]
 	fn encode_explicit_size_message_works() {
 		let msg = encode_message::<Rialto, Millau>(&Message::Sized {
 			size: ExplicitOrMaximal::Explicit(100),
 		})
 		.unwrap();
-		// since it isn't the returned XCM what is sent over the wire, we can only check if
-		// it is close to what we need
-		assert!(
-			(1f64 - (approximate_message_size::<Rialto>(msg.len()) as f64) / 100_f64).abs() < 0.1
-		);
+		assert_eq!(msg.len(), 100);
 		// check that it decodes to valid xcm
 		let _ = decode_xcm::<()>(msg).unwrap();
 	}
@@ -180,12 +144,7 @@ mod tests {
 		let msg =
 			encode_message::<Rialto, Millau>(&Message::Sized { size: ExplicitOrMaximal::Maximal })
 				.unwrap();
-		// since it isn't the returned XCM what is sent over the wire, we can only check if
-		// it is close to what we need
-		assert!(
-			(1f64 - approximate_message_size::<Rialto>(msg.len()) as f64 / maximal_size as f64)
-				.abs() < 0.1
-		);
+		assert_eq!(msg.len(), maximal_size as usize);
 		// check that it decodes to valid xcm
 		let _ = decode_xcm::<()>(msg).unwrap();
 	}