mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-07-16 02:35:44 +00:00
Andronik Ordian
0a8a607a58
* update tiny-keccak to 0.2 * update deps except bitvec and shared_memory * fix some warning after futures upgrade * remove useless package rename caused by bug in cargo-upgrade * revert parity-util-mem * * remove unused import * cargo update * remove all renames on parity-scale-codec * remove the leftovers * remove unused dep
107 lines
2.9 KiB
Rust
107 lines
2.9 KiB
Rust
// Copyright 2017-2020 Parity Technologies (UK) Ltd.
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// This file is part of Polkadot.
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// Polkadot 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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// Polkadot 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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// You should have received a copy of the GNU General Public License
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// along with Polkadot. If not, see <http://www.gnu.org/licenses/>.
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//! Basic parachain that adds a number as part of its state.
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#![no_std]
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#![cfg_attr(not(feature = "std"), feature(core_intrinsics, lang_items, core_panic_info, alloc_error_handler))]
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use parity_scale_codec::{Encode, Decode};
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use tiny_keccak::{Hasher as _, Keccak};
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#[cfg(not(feature = "std"))]
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mod wasm_validation;
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#[cfg(not(feature = "std"))]
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#[global_allocator]
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static ALLOC: dlmalloc::GlobalDlmalloc = dlmalloc::GlobalDlmalloc;
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// Make the WASM binary available.
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#[cfg(feature = "std")]
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include!(concat!(env!("OUT_DIR"), "/wasm_binary.rs"));
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fn keccak256(input: &[u8]) -> [u8; 32] {
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let mut out = [0u8; 32];
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let mut keccak256 = Keccak::v256();
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keccak256.update(input);
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keccak256.finalize(&mut out);
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out
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}
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/// Wasm binary unwrapped. If built with `BUILD_DUMMY_WASM_BINARY`, the function panics.
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#[cfg(feature = "std")]
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pub fn wasm_binary_unwrap() -> &'static [u8] {
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WASM_BINARY.expect("Development wasm binary is not available. Testing is only \
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supported with the flag disabled.")
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}
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/// Head data for this parachain.
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#[derive(Default, Clone, Hash, Eq, PartialEq, Encode, Decode, Debug)]
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pub struct HeadData {
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/// Block number
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pub number: u64,
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/// parent block keccak256
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pub parent_hash: [u8; 32],
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/// hash of post-execution state.
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pub post_state: [u8; 32],
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}
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impl HeadData {
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pub fn hash(&self) -> [u8; 32] {
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keccak256(&self.encode())
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}
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}
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/// Block data for this parachain.
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#[derive(Default, Clone, Encode, Decode, Debug)]
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pub struct BlockData {
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/// State to begin from.
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pub state: u64,
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/// Amount to add (wrapping)
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pub add: u64,
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}
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pub fn hash_state(state: u64) -> [u8; 32] {
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keccak256(state.encode().as_slice())
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}
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/// Start state mismatched with parent header's state hash.
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#[derive(Debug)]
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pub struct StateMismatch;
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/// Execute a block body on top of given parent head, producing new parent head
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/// if valid.
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pub fn execute(
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parent_hash: [u8; 32],
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parent_head: HeadData,
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block_data: &BlockData,
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) -> Result<HeadData, StateMismatch> {
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assert_eq!(parent_hash, parent_head.hash());
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if hash_state(block_data.state) != parent_head.post_state {
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return Err(StateMismatch);
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}
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let new_state = block_data.state.wrapping_add(block_data.add);
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Ok(HeadData {
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number: parent_head.number + 1,
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parent_hash,
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post_state: hash_state(new_state),
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})
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}
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