mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-01 11:17:56 +00:00
Robert Habermeier
90 lines
2.6 KiB
Rust
90 lines
2.6 KiB
Rust
// Copyright 2017 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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//! Conrete externalities implementation.
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use std::{error, fmt};
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use triehash::trie_root;
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use backend::Backend;
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use {Externalities, ExternalitiesError, OverlayedChanges};
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/// Errors that can occur when interacting with the externalities.
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#[derive(Debug, Copy, Clone)]
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pub enum Error<B, E> {
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/// Failure to load state data from the backend.
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#[allow(unused)]
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Backend(B),
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/// Failure to execute a function.
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#[allow(unused)]
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Executor(E),
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}
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impl<B: fmt::Display, E: fmt::Display> fmt::Display for Error<B, E> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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match *self {
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Error::Backend(ref e) => write!(f, "Storage backend error: {}", e),
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Error::Executor(ref e) => write!(f, "Sub-call execution error: {}", e),
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}
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}
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}
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impl<B: error::Error, E: error::Error> error::Error for Error<B, E> {
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fn description(&self) -> &str {
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match *self {
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Error::Backend(..) => "backend error",
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Error::Executor(..) => "executor error",
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}
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}
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}
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/// Wraps a read-only backend, call executor, and current overlayed changes.
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pub struct Ext<'a, B: 'a> {
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/// The overlayed changes to write to.
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pub overlay: &'a mut OverlayedChanges,
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/// The storage backend to read from.
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pub backend: &'a B,
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}
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impl<'a, B: 'a> Externalities for Ext<'a, B>
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where B: Backend
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{
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fn storage(&self, key: &[u8]) -> Result<&[u8], ExternalitiesError> {
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match self.overlay.storage(key) {
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Some(x) => Ok(x),
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None => self.backend.storage(key).map_err(|_| ExternalitiesError),
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}
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}
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fn set_storage(&mut self, key: Vec<u8>, value: Vec<u8>) {
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self.overlay.set_storage(key, value);
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}
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fn chain_id(&self) -> u64 {
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42
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}
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fn storage_root(&self) -> [u8; 32] {
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let mut all_pairs = self.backend.pairs();
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all_pairs.extend(
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self.overlay.committed.storage.iter()
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.chain(self.overlay.prospective.storage.iter())
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.map(|(k, v)| (&k[..], &v[..]))
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);
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trie_root(all_pairs.into_iter().map(|(k, v)| (k.to_vec(), v.to_vec()))).0
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}
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}
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