diff --git a/bridges/bin/runtime-common/src/lib.rs b/bridges/bin/runtime-common/src/lib.rs
index e8a2d2470fa191030dc4c20ee3fd37fbd90f9c05..12b096492cd486dd78e5912263da43603c24dcb5 100644
--- a/bridges/bin/runtime-common/src/lib.rs
+++ b/bridges/bin/runtime-common/src/lib.rs
@@ -159,7 +159,21 @@ 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,
diff --git a/bridges/relays/bin-substrate/Cargo.toml b/bridges/relays/bin-substrate/Cargo.toml
index 7853b9cb599ac745f836a667990b92e56f9f2bda..0a315035042a13bd781ffc29788507573f4d379c 100644
--- a/bridges/relays/bin-substrate/Cargo.toml
+++ b/bridges/relays/bin-substrate/Cargo.toml
@@ -49,6 +49,9 @@ 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
@@ -62,8 +65,8 @@ 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", default-features = false }
-
+xcm = { git = "https://github.com/paritytech/polkadot", branch = "master" }
+xcm-executor = { git = "https://github.com/paritytech/polkadot", branch = "master" }
[dev-dependencies]
bp-test-utils = { path = "../../primitives/test-utils" }
diff --git a/bridges/relays/bin-substrate/src/chains/millau.rs b/bridges/relays/bin-substrate/src/chains/millau.rs
index 44416195c6a4427418b5b6a93f12dffa45a874ce..4cee26255d397eb5894cf05a125e7911b8b9d318 100644
--- a/bridges/relays/bin-substrate/src/chains/millau.rs
+++ b/bridges/relays/bin-substrate/src/chains/millau.rs
@@ -18,10 +18,38 @@
use crate::cli::{encode_message::CliEncodeMessage, CliChain};
use bp_runtime::EncodedOrDecodedCall;
+use bridge_runtime_common::CustomNetworkId;
use relay_millau_client::Millau;
use relay_substrate_client::SimpleRuntimeVersion;
+use xcm_executor::traits::ExportXcm;
impl CliEncodeMessage for Millau {
+ fn encode_wire_message(
+ target: xcm::v3::NetworkId,
+ at_target_xcm: xcm::v3::Xcm<()>,
+ ) -> anyhow::Result<Vec<u8>> {
+ anyhow::ensure!(
+ [
+ CustomNetworkId::Rialto.as_network_id(),
+ CustomNetworkId::RialtoParachain.as_network_id()
+ ]
+ .contains(&target),
+ 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>> {
diff --git a/bridges/relays/bin-substrate/src/chains/rialto.rs b/bridges/relays/bin-substrate/src/chains/rialto.rs
index 34a448ae4cb13cae36a8a3b795fec09c3c2b0dba..30bc7eb13ca99370c5c769ead96bac0d42a0b686 100644
--- a/bridges/relays/bin-substrate/src/chains/rialto.rs
+++ b/bridges/relays/bin-substrate/src/chains/rialto.rs
@@ -18,10 +18,33 @@
use crate::cli::{encode_message::CliEncodeMessage, CliChain};
use bp_runtime::EncodedOrDecodedCall;
+use bridge_runtime_common::CustomNetworkId;
use relay_rialto_client::Rialto;
use relay_substrate_client::SimpleRuntimeVersion;
+use xcm_executor::traits::ExportXcm;
impl CliEncodeMessage for Rialto {
+ fn encode_wire_message(
+ target: xcm::v3::NetworkId,
+ at_target_xcm: xcm::v3::Xcm<()>,
+ ) -> anyhow::Result<Vec<u8>> {
+ anyhow::ensure!(
+ target == CustomNetworkId::Millau.as_network_id(),
+ anyhow::format_err!("Unsupported target chain: {:?}", 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>> {
diff --git a/bridges/relays/bin-substrate/src/chains/rialto_parachain.rs b/bridges/relays/bin-substrate/src/chains/rialto_parachain.rs
index 8ea2c1ffd433cdec79de5306aa11f5102e7d77e1..872d96981d0bf621363a703d6de8904b28b08cb3 100644
--- a/bridges/relays/bin-substrate/src/chains/rialto_parachain.rs
+++ b/bridges/relays/bin-substrate/src/chains/rialto_parachain.rs
@@ -18,10 +18,33 @@
use crate::cli::{encode_message::CliEncodeMessage, CliChain};
use bp_runtime::EncodedOrDecodedCall;
+use bridge_runtime_common::CustomNetworkId;
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: xcm::v3::NetworkId,
+ at_target_xcm: xcm::v3::Xcm<()>,
+ ) -> anyhow::Result<Vec<u8>> {
+ anyhow::ensure!(
+ target == CustomNetworkId::Millau.as_network_id(),
+ 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>> {
diff --git a/bridges/relays/bin-substrate/src/cli/encode_message.rs b/bridges/relays/bin-substrate/src/cli/encode_message.rs
index 9abf8b2df6dda4ad7e7833c415a087b5c3b6d219..646075e8326798a10d3713614f1e8be2ff4079fe 100644
--- a/bridges/relays/bin-substrate/src/cli/encode_message.rs
+++ b/bridges/relays/bin-substrate/src/cli/encode_message.rs
@@ -16,10 +16,12 @@
use crate::cli::{ExplicitOrMaximal, HexBytes};
use bp_runtime::EncodedOrDecodedCall;
+use bridge_runtime_common::CustomNetworkId;
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.
///
@@ -43,6 +45,22 @@ 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))?;
+ Ok(X2(
+ GlobalConsensus(this_network),
+ AccountId32 { network: Some(this_network), id: [0u8; 32] },
+ ))
+ }
+
+ /// 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: NetworkId, at_target_xcm: Xcm<()>) -> anyhow::Result<Vec<u8>>;
/// Encode an `execute` XCM call of the XCM pallet.
fn encode_execute_xcm(
message: xcm::VersionedXcm<Self::Call>,
@@ -56,41 +74,52 @@ pub trait CliEncodeMessage: Chain {
}
/// Encode message payload passed through CLI flags.
-pub(crate) fn encode_message<Source: Chain, Target: Chain>(
+pub(crate) fn encode_message<Source: CliEncodeMessage, Target: Chain>(
message: &Message,
) -> anyhow::Result<RawMessage> {
Ok(match message {
Message::Raw { ref data } => data.0.clone(),
Message::Sized { ref size } => {
- let expected_xcm_size = match *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 {
ExplicitOrMaximal::Explicit(size) => size,
ExplicitOrMaximal::Maximal => compute_maximal_message_size(
Source::max_extrinsic_size(),
Target::max_extrinsic_size(),
),
- };
-
- // 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()
+ } as usize;
+
+ let at_target_xcm = vec![ExpectPallet {
+ index: 0,
+ name: vec![42; expected_size],
+ module_name: vec![],
+ crate_major: 0,
+ min_crate_minor: 0,
+ }]
+ .into();
+ let at_target_xcm_size =
+ Source::encode_wire_message(destination, at_target_xcm)?.encoded_size();
+ let at_target_xcm_overhead = at_target_xcm_size.saturating_sub(expected_size);
+ let at_target_xcm = vec![ExpectPallet {
+ index: 0,
+ name: vec![42; expected_size.saturating_sub(at_target_xcm_overhead)],
+ module_name: vec![],
+ crate_major: 0,
+ min_crate_minor: 0,
+ }]
+ .into();
+
+ xcm::VersionedXcm::<()>::V3(
+ vec![ExportMessage {
+ network: destination,
+ destination: destination.into(),
+ xcm: at_target_xcm,
+ }]
+ .into(),
+ )
+ .encode()
},
})
}
@@ -108,11 +137,7 @@ pub(crate) fn compute_maximal_message_size(
bridge_runtime_common::messages::target::maximal_incoming_message_size(
maximal_target_extrinsic_size,
);
- if maximal_message_size > maximal_source_extrinsic_size {
- maximal_source_extrinsic_size
- } else {
- maximal_message_size
- }
+ std::cmp::min(maximal_message_size, maximal_source_extrinsic_size)
}
#[cfg(test)]
@@ -123,13 +148,21 @@ 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();
- assert_eq!(msg.len(), 100);
+ // 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
+ );
// check that it decodes to valid xcm
let _ = decode_xcm::<()>(msg).unwrap();
}
@@ -144,7 +177,12 @@ mod tests {
let msg =
encode_message::<Rialto, Millau>(&Message::Sized { size: ExplicitOrMaximal::Maximal })
.unwrap();
- assert_eq!(msg.len(), maximal_size as usize);
+ // 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
+ );
// check that it decodes to valid xcm
let _ = decode_xcm::<()>(msg).unwrap();
}