mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-26 19:17:58 +00:00
Shawn Tabrizi
85 lines
2.8 KiB
Rust
85 lines
2.8 KiB
Rust
// Copyright 2018-2020 Parity Technologies (UK) Ltd.
|
|
// This file is part of Substrate.
|
|
|
|
// Substrate 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.
|
|
|
|
// Substrate 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.
|
|
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with Substrate. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
//! Block evaluation and evaluation errors.
|
|
|
|
use super::MAX_BLOCK_SIZE;
|
|
|
|
use codec::Encode;
|
|
use sp_runtime::traits::{Block as BlockT, Header as HeaderT, One, CheckedConversion};
|
|
|
|
// This is just a best effort to encode the number. None indicated that it's too big to encode
|
|
// in a u128.
|
|
type BlockNumber = Option<u128>;
|
|
|
|
/// Result type alias.
|
|
pub type Result<T> = std::result::Result<T, Error>;
|
|
|
|
/// Error type.
|
|
#[derive(Debug, derive_more::Display)]
|
|
pub enum Error {
|
|
/// Proposal provided not a block.
|
|
#[display(fmt="Proposal provided not a block: decoding error: {}", _0)]
|
|
BadProposalFormat(codec::Error),
|
|
/// Proposal had wrong parent hash.
|
|
#[display(fmt="Proposal had wrong parent hash. Expected {:?}, got {:?}", expected, got)]
|
|
WrongParentHash { expected: String, got: String },
|
|
/// Proposal had wrong number.
|
|
#[display(fmt="Proposal had wrong number. Expected {:?}, got {:?}", expected, got)]
|
|
WrongNumber { expected: BlockNumber, got: BlockNumber },
|
|
/// Proposal exceeded the maximum size.
|
|
#[display(
|
|
fmt="Proposal exceeded the maximum size of {} by {} bytes.",
|
|
"MAX_BLOCK_SIZE", "_0.saturating_sub(MAX_BLOCK_SIZE)"
|
|
)]
|
|
ProposalTooLarge(usize),
|
|
}
|
|
|
|
impl std::error::Error for Error {}
|
|
|
|
/// Attempt to evaluate a substrate block as a node block, returning error
|
|
/// upon any initial validity checks failing.
|
|
pub fn evaluate_initial<Block: BlockT>(
|
|
proposal: &Block,
|
|
parent_hash: &<Block as BlockT>::Hash,
|
|
parent_number: <<Block as BlockT>::Header as HeaderT>::Number,
|
|
) -> Result<()> {
|
|
|
|
let encoded = Encode::encode(proposal);
|
|
let proposal = Block::decode(&mut &encoded[..])
|
|
.map_err(|e| Error::BadProposalFormat(e))?;
|
|
|
|
if encoded.len() > MAX_BLOCK_SIZE {
|
|
return Err(Error::ProposalTooLarge(encoded.len()))
|
|
}
|
|
|
|
if *parent_hash != *proposal.header().parent_hash() {
|
|
return Err(Error::WrongParentHash {
|
|
expected: format!("{:?}", *parent_hash),
|
|
got: format!("{:?}", proposal.header().parent_hash())
|
|
});
|
|
}
|
|
|
|
if parent_number + One::one() != *proposal.header().number() {
|
|
return Err(Error::WrongNumber {
|
|
expected: parent_number.checked_into::<u128>().map(|x| x + 1),
|
|
got: (*proposal.header().number()).checked_into::<u128>(),
|
|
});
|
|
}
|
|
|
|
Ok(())
|
|
}
|