mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-06-27 14:01:08 +00:00
Benjamin Kampmann
86 lines
2.8 KiB
Rust
86 lines
2.8 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2018-2020 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! Block evaluation and evaluation errors.
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use super::MAX_BLOCK_SIZE;
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use codec::Encode;
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use sp_runtime::traits::{Block as BlockT, Header as HeaderT, One, CheckedConversion};
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// This is just a best effort to encode the number. None indicated that it's too big to encode
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// in a u128.
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type BlockNumber = Option<u128>;
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/// Result type alias.
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pub type Result<T> = std::result::Result<T, Error>;
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/// Error type.
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#[derive(Debug, derive_more::Display)]
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pub enum Error {
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/// Proposal provided not a block.
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#[display(fmt="Proposal provided not a block: decoding error: {}", _0)]
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BadProposalFormat(codec::Error),
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/// Proposal had wrong parent hash.
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#[display(fmt="Proposal had wrong parent hash. Expected {:?}, got {:?}", expected, got)]
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WrongParentHash { expected: String, got: String },
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/// Proposal had wrong number.
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#[display(fmt="Proposal had wrong number. Expected {:?}, got {:?}", expected, got)]
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WrongNumber { expected: BlockNumber, got: BlockNumber },
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/// Proposal exceeded the maximum size.
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#[display(
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fmt="Proposal exceeded the maximum size of {} by {} bytes.",
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"MAX_BLOCK_SIZE", "_0.saturating_sub(MAX_BLOCK_SIZE)"
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)]
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ProposalTooLarge(usize),
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}
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impl std::error::Error for Error {}
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/// Attempt to evaluate a substrate block as a node block, returning error
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/// upon any initial validity checks failing.
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pub fn evaluate_initial<Block: BlockT>(
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proposal: &Block,
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parent_hash: &<Block as BlockT>::Hash,
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parent_number: <<Block as BlockT>::Header as HeaderT>::Number,
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) -> Result<()> {
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let encoded = Encode::encode(proposal);
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let proposal = Block::decode(&mut &encoded[..])
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.map_err(|e| Error::BadProposalFormat(e))?;
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if encoded.len() > MAX_BLOCK_SIZE {
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return Err(Error::ProposalTooLarge(encoded.len()))
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}
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if *parent_hash != *proposal.header().parent_hash() {
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return Err(Error::WrongParentHash {
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expected: format!("{:?}", *parent_hash),
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got: format!("{:?}", proposal.header().parent_hash())
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});
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}
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if parent_number + One::one() != *proposal.header().number() {
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return Err(Error::WrongNumber {
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expected: parent_number.checked_into::<u128>().map(|x| x + 1),
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got: (*proposal.header().number()).checked_into::<u128>(),
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});
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}
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Ok(())
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}
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