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[polkadot-staging] Separate send_message() validations (paritytec…
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…h#2795)

* Fix xcm-bridge-hub build

* Move send_message definition to MessagesBridge impl

* Make send_message infallible

* Split `MessagesBridge` into 2 phases

Split `MessagesBridge` into 2 phases:
- message validation
- message sending
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serban300 committed Apr 8, 2024
1 parent 89b764d commit eb76546
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Showing 8 changed files with 180 additions and 196 deletions.
4 changes: 2 additions & 2 deletions bridges/modules/messages/src/benchmarking.rs
Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,7 @@ use codec::Decode;
use frame_benchmarking::{account, benchmarks_instance_pallet};
use frame_support::weights::Weight;
use frame_system::RawOrigin;
use sp_runtime::traits::TrailingZeroInput;
use sp_runtime::{traits::TrailingZeroInput, BoundedVec};
use sp_std::{ops::RangeInclusive, prelude::*};

const SEED: u32 = 0;
Expand Down Expand Up @@ -443,7 +443,7 @@ benchmarks_instance_pallet! {

fn send_regular_message<T: Config<I>, I: 'static>() {
let mut outbound_lane = outbound_lane::<T, I>(T::bench_lane_id());
outbound_lane.send_message(vec![]).expect("We craft valid messages");
outbound_lane.send_message(BoundedVec::try_from(vec![]).expect("We craft valid messages"));
}

fn receive_messages<T: Config<I>, I: 'static>(nonce: MessageNonce) {
Expand Down
185 changes: 97 additions & 88 deletions bridges/modules/messages/src/lib.rs
Original file line number Diff line number Diff line change
Expand Up @@ -534,6 +534,7 @@ pub mod pallet {
}

#[pallet::error]
#[derive(PartialEq, Eq)]
pub enum Error<T, I = ()> {
/// Pallet is not in Normal operating mode.
NotOperatingNormally,
Expand All @@ -543,8 +544,6 @@ pub mod pallet {
MessageDispatchInactive,
/// Message has been treated as invalid by chain verifier.
MessageRejectedByChainVerifier(VerificationError),
/// Message has been treated as invalid by lane verifier.
MessageRejectedByLaneVerifier(VerificationError),
/// Message has been treated as invalid by the pallet logic.
MessageRejectedByPallet(VerificationError),
/// Submitter has failed to pay fee for delivering and dispatching messages.
Expand Down Expand Up @@ -690,68 +689,72 @@ pub mod pallet {
}
}

/// Structure, containing a validated message payload and all the info required
/// to send it on the bridge.
#[derive(Debug, PartialEq, Eq)]
pub struct SendMessageArgs<T: Config<I>, I: 'static> {
lane_id: LaneId,
payload: StoredMessagePayload<T, I>,
}

impl<T, I> bp_messages::source_chain::MessagesBridge<T::OutboundPayload> for Pallet<T, I>
where
T: Config<I>,
I: 'static,
{
type Error = sp_runtime::DispatchErrorWithPostInfo<PostDispatchInfo>;
type Error = Error<T, I>;
type SendMessageArgs = SendMessageArgs<T, I>;

fn send_message(
fn validate_message(
lane: LaneId,
message: T::OutboundPayload,
) -> Result<SendMessageArtifacts, Self::Error> {
crate::send_message::<T, I>(lane, message)
message: &T::OutboundPayload,
) -> Result<SendMessageArgs<T, I>, Self::Error> {
ensure_normal_operating_mode::<T, I>()?;

// let's check if outbound lane is active
ensure!(T::ActiveOutboundLanes::get().contains(&lane), Error::<T, I>::InactiveOutboundLane);

// let's first check if message can be delivered to target chain
T::TargetHeaderChain::verify_message(message).map_err(|err| {
log::trace!(
target: LOG_TARGET,
"Message to lane {:?} is rejected by target chain: {:?}",
lane,
err,
);

Error::<T, I>::MessageRejectedByChainVerifier(err)
})?;

Ok(SendMessageArgs {
lane_id: lane,
payload: StoredMessagePayload::<T, I>::try_from(message.encode()).map_err(|_| {
Error::<T, I>::MessageRejectedByPallet(VerificationError::MessageTooLarge)
})?,
})
}
}

/// Function that actually sends message.
fn send_message<T: Config<I>, I: 'static>(
lane_id: LaneId,
payload: T::OutboundPayload,
) -> sp_std::result::Result<
SendMessageArtifacts,
sp_runtime::DispatchErrorWithPostInfo<PostDispatchInfo>,
> {
ensure_normal_operating_mode::<T, I>()?;

// let's check if outbound lane is active
ensure!(T::ActiveOutboundLanes::get().contains(&lane_id), Error::<T, I>::InactiveOutboundLane,);

// let's first check if message can be delivered to target chain
T::TargetHeaderChain::verify_message(&payload).map_err(|err| {
fn send_message(args: SendMessageArgs<T, I>) -> SendMessageArtifacts {
// save message in outbound storage and emit event
let mut lane = outbound_lane::<T, I>(args.lane_id);
let message_len = args.payload.len();
let nonce = lane.send_message(args.payload);

// return number of messages in the queue to let sender know about its state
let enqueued_messages = lane.data().queued_messages().saturating_len();

log::trace!(
target: LOG_TARGET,
"Message to lane {:?} is rejected by target chain: {:?}",
lane_id,
err,
"Accepted message {} to lane {:?}. Message size: {:?}",
nonce,
args.lane_id,
message_len,
);

Error::<T, I>::MessageRejectedByChainVerifier(err)
})?;

// finally, save message in outbound storage and emit event
let mut lane = outbound_lane::<T, I>(lane_id);
let encoded_payload = payload.encode();
let encoded_payload_len = encoded_payload.len();
let nonce = lane
.send_message(encoded_payload)
.map_err(Error::<T, I>::MessageRejectedByPallet)?;

// return number of messages in the queue to let sender know about its state
let enqueued_messages = lane.data().queued_messages().saturating_len();

log::trace!(
target: LOG_TARGET,
"Accepted message {} to lane {:?}. Message size: {:?}",
nonce,
lane_id,
encoded_payload_len,
);

Pallet::<T, I>::deposit_event(Event::MessageAccepted { lane_id, nonce });
Pallet::<T, I>::deposit_event(Event::MessageAccepted { lane_id: args.lane_id, nonce });

Ok(SendMessageArtifacts { nonce, enqueued_messages })
SendMessageArtifacts { nonce, enqueued_messages }
}
}

/// Ensure that the pallet is in normal operational mode.
Expand Down Expand Up @@ -852,6 +855,8 @@ struct RuntimeOutboundLaneStorage<T, I = ()> {
}

impl<T: Config<I>, I: 'static> OutboundLaneStorage for RuntimeOutboundLaneStorage<T, I> {
type StoredMessagePayload = StoredMessagePayload<T, I>;

fn id(&self) -> LaneId {
self.lane_id
}
Expand All @@ -865,22 +870,15 @@ impl<T: Config<I>, I: 'static> OutboundLaneStorage for RuntimeOutboundLaneStorag
}

#[cfg(test)]
fn message(&self, nonce: &MessageNonce) -> Option<MessagePayload> {
fn message(&self, nonce: &MessageNonce) -> Option<Self::StoredMessagePayload> {
OutboundMessages::<T, I>::get(MessageKey { lane_id: self.lane_id, nonce: *nonce })
.map(Into::into)
}

fn save_message(
&mut self,
nonce: MessageNonce,
message_payload: MessagePayload,
) -> Result<(), VerificationError> {
fn save_message(&mut self, nonce: MessageNonce, message_payload: Self::StoredMessagePayload) {
OutboundMessages::<T, I>::insert(
MessageKey { lane_id: self.lane_id, nonce },
StoredMessagePayload::<T, I>::try_from(message_payload)
.map_err(|_| VerificationError::MessageTooLarge)?,
message_payload,
);
Ok(())
}

fn remove_message(&mut self, nonce: &MessageNonce) {
Expand Down Expand Up @@ -927,7 +925,10 @@ mod tests {
},
outbound_lane::ReceivalConfirmationError,
};
use bp_messages::{BridgeMessagesCall, UnrewardedRelayer, UnrewardedRelayersState};
use bp_messages::{
source_chain::MessagesBridge, BridgeMessagesCall, UnrewardedRelayer,
UnrewardedRelayersState,
};
use bp_test_utils::generate_owned_bridge_module_tests;
use frame_support::{
assert_noop, assert_ok,
Expand All @@ -944,14 +945,15 @@ mod tests {
System::<TestRuntime>::reset_events();
}

fn send_regular_message() {
fn send_regular_message(lane_id: LaneId) {
get_ready_for_events();

let outbound_lane = outbound_lane::<TestRuntime, ()>(TEST_LANE_ID);
let outbound_lane = outbound_lane::<TestRuntime, ()>(lane_id);
let message_nonce = outbound_lane.data().latest_generated_nonce + 1;
let prev_enqueud_messages = outbound_lane.data().queued_messages().saturating_len();
let artifacts = send_message::<TestRuntime, ()>(TEST_LANE_ID, REGULAR_PAYLOAD)
.expect("send_message has failed");
let valid_message = Pallet::<TestRuntime, ()>::validate_message(lane_id, &REGULAR_PAYLOAD)
.expect("validate_message has failed");
let artifacts = Pallet::<TestRuntime, ()>::send_message(valid_message);
assert_eq!(artifacts.enqueued_messages, prev_enqueud_messages + 1);

// check event with assigned nonce
Expand All @@ -960,7 +962,7 @@ mod tests {
vec![EventRecord {
phase: Phase::Initialization,
event: TestEvent::Messages(Event::MessageAccepted {
lane_id: TEST_LANE_ID,
lane_id,
nonce: message_nonce
}),
topics: vec![],
Expand Down Expand Up @@ -1011,14 +1013,14 @@ mod tests {
fn pallet_rejects_transactions_if_halted() {
run_test(|| {
// send message first to be able to check that delivery_proof fails later
send_regular_message();
send_regular_message(TEST_LANE_ID);

PalletOperatingMode::<TestRuntime, ()>::put(MessagesOperatingMode::Basic(
BasicOperatingMode::Halted,
));

assert_noop!(
send_message::<TestRuntime, ()>(TEST_LANE_ID, REGULAR_PAYLOAD,),
Pallet::<TestRuntime, ()>::validate_message(TEST_LANE_ID, &REGULAR_PAYLOAD),
Error::<TestRuntime, ()>::NotOperatingNormally,
);

Expand Down Expand Up @@ -1061,14 +1063,14 @@ mod tests {
fn pallet_rejects_new_messages_in_rejecting_outbound_messages_operating_mode() {
run_test(|| {
// send message first to be able to check that delivery_proof fails later
send_regular_message();
send_regular_message(TEST_LANE_ID);

PalletOperatingMode::<TestRuntime, ()>::put(
MessagesOperatingMode::RejectingOutboundMessages,
);

assert_noop!(
send_message::<TestRuntime, ()>(TEST_LANE_ID, REGULAR_PAYLOAD,),
Pallet::<TestRuntime, ()>::validate_message(TEST_LANE_ID, &REGULAR_PAYLOAD),
Error::<TestRuntime, ()>::NotOperatingNormally,
);

Expand Down Expand Up @@ -1104,7 +1106,7 @@ mod tests {
#[test]
fn send_message_works() {
run_test(|| {
send_regular_message();
send_regular_message(TEST_LANE_ID);
});
}

Expand All @@ -1118,7 +1120,7 @@ mod tests {
.extra
.extend_from_slice(&[0u8; MAX_OUTBOUND_PAYLOAD_SIZE as usize]);
assert_noop!(
send_message::<TestRuntime, ()>(TEST_LANE_ID, message_payload.clone(),),
Pallet::<TestRuntime, ()>::validate_message(TEST_LANE_ID, &message_payload.clone(),),
Error::<TestRuntime, ()>::MessageRejectedByPallet(
VerificationError::MessageTooLarge
),
Expand All @@ -1129,7 +1131,11 @@ mod tests {
message_payload.extra.pop();
}
assert_eq!(message_payload.encoded_size() as u32, MAX_OUTBOUND_PAYLOAD_SIZE);
assert_ok!(send_message::<TestRuntime, ()>(TEST_LANE_ID, message_payload,),);

let valid_message =
Pallet::<TestRuntime, ()>::validate_message(TEST_LANE_ID, &message_payload)
.expect("validate_message has failed");
Pallet::<TestRuntime, ()>::send_message(valid_message);
})
}

Expand All @@ -1138,7 +1144,10 @@ mod tests {
run_test(|| {
// messages with this payload are rejected by target chain verifier
assert_noop!(
send_message::<TestRuntime, ()>(TEST_LANE_ID, PAYLOAD_REJECTED_BY_TARGET_CHAIN,),
Pallet::<TestRuntime, ()>::validate_message(
TEST_LANE_ID,
&PAYLOAD_REJECTED_BY_TARGET_CHAIN,
),
Error::<TestRuntime, ()>::MessageRejectedByChainVerifier(VerificationError::Other(
mock::TEST_ERROR
)),
Expand Down Expand Up @@ -1298,7 +1307,7 @@ mod tests {
#[test]
fn receive_messages_delivery_proof_works() {
run_test(|| {
send_regular_message();
send_regular_message(TEST_LANE_ID);
receive_messages_delivery_proof();

assert_eq!(
Expand All @@ -1311,8 +1320,8 @@ mod tests {
#[test]
fn receive_messages_delivery_proof_rewards_relayers() {
run_test(|| {
assert_ok!(send_message::<TestRuntime, ()>(TEST_LANE_ID, REGULAR_PAYLOAD,));
assert_ok!(send_message::<TestRuntime, ()>(TEST_LANE_ID, REGULAR_PAYLOAD,));
send_regular_message(TEST_LANE_ID);
send_regular_message(TEST_LANE_ID);

// this reports delivery of message 1 => reward is paid to TEST_RELAYER_A
let single_message_delivery_proof = TestMessagesDeliveryProof(Ok((
Expand Down Expand Up @@ -1698,9 +1707,9 @@ mod tests {
#[test]
fn messages_delivered_callbacks_are_called() {
run_test(|| {
send_regular_message();
send_regular_message();
send_regular_message();
send_regular_message(TEST_LANE_ID);
send_regular_message(TEST_LANE_ID);
send_regular_message(TEST_LANE_ID);

// messages 1+2 are confirmed in 1 tx, message 3 in a separate tx
// dispatch of message 2 has failed
Expand Down Expand Up @@ -1759,7 +1768,7 @@ mod tests {
) {
run_test(|| {
// send message first to be able to check that delivery_proof fails later
send_regular_message();
send_regular_message(TEST_LANE_ID);

// 1) InboundLaneData declares that the `last_confirmed_nonce` is 1;
// 2) InboundLaneData has no entries => `InboundLaneData::last_delivered_nonce()`
Expand Down Expand Up @@ -1826,10 +1835,10 @@ mod tests {
#[test]
fn on_idle_callback_respects_remaining_weight() {
run_test(|| {
send_regular_message();
send_regular_message();
send_regular_message();
send_regular_message();
send_regular_message(TEST_LANE_ID);
send_regular_message(TEST_LANE_ID);
send_regular_message(TEST_LANE_ID);
send_regular_message(TEST_LANE_ID);

assert_ok!(Pallet::<TestRuntime>::receive_messages_delivery_proof(
RuntimeOrigin::signed(1),
Expand Down Expand Up @@ -1908,10 +1917,10 @@ mod tests {
fn on_idle_callback_is_rotating_lanes_to_prune() {
run_test(|| {
// send + receive confirmation for lane 1
send_regular_message();
send_regular_message(TEST_LANE_ID);
receive_messages_delivery_proof();
// send + receive confirmation for lane 2
assert_ok!(send_message::<TestRuntime, ()>(TEST_LANE_ID_2, REGULAR_PAYLOAD,));
send_regular_message(TEST_LANE_ID_2);
assert_ok!(Pallet::<TestRuntime>::receive_messages_delivery_proof(
RuntimeOrigin::signed(1),
TestMessagesDeliveryProof(Ok((
Expand Down Expand Up @@ -1987,7 +1996,7 @@ mod tests {
fn outbound_message_from_unconfigured_lane_is_rejected() {
run_test(|| {
assert_noop!(
send_message::<TestRuntime, ()>(TEST_LANE_ID_3, REGULAR_PAYLOAD,),
Pallet::<TestRuntime, ()>::validate_message(TEST_LANE_ID_3, &REGULAR_PAYLOAD,),
Error::<TestRuntime, ()>::InactiveOutboundLane,
);
});
Expand Down
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