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* add inbound queue * add symbiotic_message_processor * add doc comments
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| Original file line number | Diff line number | Diff line change |
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| // Copyright (C) Moondance Labs Ltd. | ||
| // This file is part of Tanssi. | ||
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| // Tanssi 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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| // Tanssi 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 Tanssi. If not, see <http://www.gnu.org/licenses/> | ||
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| use frame_support::pallet_prelude::*; | ||
| use parity_scale_codec::DecodeAll; | ||
| use snowbridge_core::Channel; | ||
| use snowbridge_router_primitives::inbound::envelope::Envelope; | ||
| use snowbridge_router_primitives::inbound::MessageProcessor; | ||
| use sp_runtime::DispatchError; | ||
| use sp_std::vec::Vec; | ||
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| /// Magic bytes are added in every payload intended for this processor to make sure | ||
| /// that we are the intended recipient of the message. Reason being scale encoding is not type aware. | ||
| /// So a same set of bytes can be decoded for two different data structures if their | ||
| /// total size is same. Magic bytes can be checked after decoding to make sure that the sender | ||
| /// indeed send a message intended for this processor. | ||
| pub const MAGIC_BYTES: [u8; 4] = [112, 21, 0, 56]; | ||
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| /// Payload is the whole data we expect to receive from the relayer | ||
| #[derive(Encode, Decode)] | ||
| pub struct Payload<T> | ||
| where | ||
| T: pallet_external_validators::Config, | ||
| { | ||
| pub magic_bytes: [u8; 4], | ||
| pub message: Message<T>, | ||
| } | ||
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| /// Actual message inside the payload | ||
| #[derive(Encode, Decode)] | ||
| pub enum Message<T> | ||
| where | ||
| T: pallet_external_validators::Config, | ||
| { | ||
| V1(InboundCommand<T>), | ||
| } | ||
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| /// Command to be executed by this message processor | ||
| #[derive(Encode, Decode)] | ||
| pub enum InboundCommand<T> | ||
| where | ||
| T: pallet_external_validators::Config, | ||
| { | ||
| ReceiveValidators { | ||
| validators: Vec<<T as pallet_external_validators::Config>::ValidatorId>, | ||
| }, | ||
| } | ||
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| pub struct SymbioticMessageProcessor<T>(PhantomData<T>); | ||
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| impl<T> MessageProcessor for SymbioticMessageProcessor<T> | ||
| where | ||
| T: pallet_external_validators::Config, | ||
| { | ||
| fn can_process_message(_channel: &Channel, envelope: &Envelope) -> bool { | ||
| let decode_result = Payload::<T>::decode_all(&mut envelope.payload.as_slice()); | ||
| if let Ok(payload) = decode_result { | ||
| payload.magic_bytes == MAGIC_BYTES | ||
| } else { | ||
| false | ||
| } | ||
| } | ||
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| fn process_message(_channel: Channel, envelope: Envelope) -> Result<(), DispatchError> { | ||
| let decode_result = Payload::<T>::decode_all(&mut envelope.payload.as_slice()); | ||
| let message = if let Ok(payload) = decode_result { | ||
| payload.message | ||
| } else { | ||
| return Err(DispatchError::Other("unable to parse the envelope payload")); | ||
| }; | ||
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| match message { | ||
| Message::V1(InboundCommand::ReceiveValidators { validators }) => { | ||
| pallet_external_validators::Pallet::<T>::set_external_validators(validators)?; | ||
| Ok(()) | ||
| } | ||
| } | ||
| } | ||
| } |
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