mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Bastian Köcher
62 lines
2.1 KiB
Rust
62 lines
2.1 KiB
Rust
// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.
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//
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// Substrate is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Substrate is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Substrate. If not, see <http://www.gnu.org/licenses/>.
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//! Block announcement validation.
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use crate::BlockStatus;
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use sp_runtime::{generic::BlockId, traits::Block};
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use std::{error::Error, sync::Arc};
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/// A type which provides access to chain information.
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pub trait Chain<B: Block> {
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/// Retrieve the status of the block denoted by the given [`BlockId`].
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fn block_status(&self, id: &BlockId<B>) -> Result<BlockStatus, Box<dyn Error + Send>>;
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}
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impl<T: Chain<B>, B: Block> Chain<B> for Arc<T> {
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fn block_status(&self, id: &BlockId<B>) -> Result<BlockStatus, Box<dyn Error + Send>> {
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(&**self).block_status(id)
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}
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}
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/// Result of `BlockAnnounceValidator::validate`.
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#[derive(Debug, PartialEq, Eq)]
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pub enum Validation {
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/// Valid block announcement.
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Success {
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/// Is this the new best block of the node?
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is_new_best: bool,
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},
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/// Invalid block announcement.
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Failure,
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}
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/// Type which checks incoming block announcements.
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pub trait BlockAnnounceValidator<B: Block> {
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/// Validate the announced header and its associated data.
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fn validate(&mut self, header: &B::Header, data: &[u8]) -> Result<Validation, Box<dyn Error + Send>>;
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}
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/// Default implementation of `BlockAnnounceValidator`.
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#[derive(Debug)]
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pub struct DefaultBlockAnnounceValidator;
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impl<B: Block> BlockAnnounceValidator<B> for DefaultBlockAnnounceValidator {
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fn validate(&mut self, _h: &B::Header, _d: &[u8]) -> Result<Validation, Box<dyn Error + Send>> {
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Ok(Validation::Success { is_new_best: false })
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}
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}
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