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Implement ExportXcm and MessageDispatch for pallet-xcm-bridge-hub (#2285
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| // Copyright 2019-2021 Parity Technologies (UK) Ltd. | ||
| // This file is part of Parity Bridges Common. | ||
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| // Parity Bridges Common 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. | ||
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| // Parity Bridges Common 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. | ||
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| // You should have received a copy of the GNU General Public License | ||
| // along with Parity Bridges Common. If not, see <http://www.gnu.org/licenses/>. | ||
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| //! The code that allows to use the pallet (`pallet-xcm-bridge-hub`) as inbound | ||
| //! bridge messages dispatcher. Internally, it just forwards inbound blob to the | ||
| //! XCM-level blob dispatcher, which pushes message to some other queue (e.g. | ||
| //! to HRMP queue with the sibling target chain). | ||
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| use crate::{Config, Pallet, XcmAsPlainPayload, LOG_TARGET}; | ||
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| use bp_messages::target_chain::{DispatchMessage, MessageDispatch}; | ||
| use bp_runtime::messages::MessageDispatchResult; | ||
| use codec::{Decode, Encode}; | ||
| use frame_support::{weights::Weight, CloneNoBound, EqNoBound, PartialEqNoBound}; | ||
| use pallet_bridge_messages::{Config as BridgeMessagesConfig, WeightInfoExt}; | ||
| use scale_info::TypeInfo; | ||
| use sp_runtime::SaturatedConversion; | ||
| use xcm_builder::{DispatchBlob, DispatchBlobError}; | ||
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| /// Message dispatch result type for single message. | ||
| #[derive(CloneNoBound, EqNoBound, PartialEqNoBound, Encode, Decode, Debug, TypeInfo)] | ||
| pub enum XcmBlobMessageDispatchResult { | ||
| /// We've been unable to decode message payload. | ||
| InvalidPayload, | ||
| /// Message has been dispatched. | ||
| Dispatched, | ||
| /// Message has **NOT** been dispatched because of given error. | ||
| NotDispatched(#[codec(skip)] Option<DispatchBlobError>), | ||
| } | ||
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| /// An easy way to access associated messages pallet weights. | ||
| type MessagesPalletWeights<T, I> = | ||
| <T as BridgeMessagesConfig<<T as Config<I>>::BridgeMessagesPalletInstance>>::WeightInfo; | ||
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| impl<T: Config<I>, I: 'static> MessageDispatch for Pallet<T, I> | ||
| where | ||
| T: BridgeMessagesConfig<InboundPayload = XcmAsPlainPayload>, | ||
| { | ||
| type DispatchPayload = XcmAsPlainPayload; | ||
| type DispatchLevelResult = XcmBlobMessageDispatchResult; | ||
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| fn is_active() -> bool { | ||
| true | ||
| } | ||
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| fn dispatch_weight(message: &mut DispatchMessage<Self::DispatchPayload>) -> Weight { | ||
| match message.data.payload { | ||
| Ok(ref payload) => { | ||
| let payload_size = payload.encoded_size().saturated_into(); | ||
| MessagesPalletWeights::<T, I>::message_dispatch_weight(payload_size) | ||
| }, | ||
| Err(_) => Weight::zero(), | ||
| } | ||
| } | ||
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| fn dispatch( | ||
| message: DispatchMessage<Self::DispatchPayload>, | ||
| ) -> MessageDispatchResult<Self::DispatchLevelResult> { | ||
| let payload = match message.data.payload { | ||
| Ok(payload) => payload, | ||
| Err(e) => { | ||
| log::error!( | ||
| target: LOG_TARGET, | ||
| "[XcmBlobMessageDispatch] payload error: {:?} - message_nonce: {:?}", | ||
| e, | ||
| message.key.nonce | ||
| ); | ||
| return MessageDispatchResult { | ||
| unspent_weight: Weight::zero(), | ||
| dispatch_level_result: XcmBlobMessageDispatchResult::InvalidPayload, | ||
| } | ||
| }, | ||
| }; | ||
| let dispatch_level_result = match T::BlobDispatcher::dispatch_blob(payload) { | ||
| Ok(_) => { | ||
| log::debug!( | ||
| target: LOG_TARGET, | ||
| "[XcmBlobMessageDispatch] DispatchBlob::dispatch_blob was ok - message_nonce: {:?}", | ||
| message.key.nonce | ||
| ); | ||
| XcmBlobMessageDispatchResult::Dispatched | ||
| }, | ||
| Err(e) => { | ||
| log::error!( | ||
| target: LOG_TARGET, | ||
| "[XcmBlobMessageDispatch] DispatchBlob::dispatch_blob failed, error: {:?} - message_nonce: {:?}", | ||
| e, message.key.nonce | ||
| ); | ||
| XcmBlobMessageDispatchResult::NotDispatched(Some(e)) | ||
| }, | ||
| }; | ||
| MessageDispatchResult { unspent_weight: Weight::zero(), dispatch_level_result } | ||
| } | ||
| } |
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