mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-29 00:57:57 +00:00
Nikolay Volf
80 lines
2.6 KiB
Rust
80 lines
2.6 KiB
Rust
// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.
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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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// 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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// 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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//! Substrate client interfaces.
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#![warn(missing_docs)]
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pub mod backend;
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pub mod call_executor;
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pub mod client;
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pub mod execution_extensions;
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pub mod light;
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pub mod notifications;
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pub mod proof_provider;
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pub use sp_blockchain as blockchain;
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pub use backend::*;
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pub use notifications::*;
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pub use call_executor::*;
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pub use client::*;
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pub use light::*;
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pub use notifications::*;
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pub use proof_provider::*;
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pub use sp_state_machine::{StorageProof, ExecutionStrategy, CloneableSpawn};
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/// Utility methods for the client.
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pub mod utils {
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use sp_blockchain::{HeaderBackend, HeaderMetadata, Error};
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use sp_runtime::traits::Block as BlockT;
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use std::borrow::Borrow;
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/// Returns a function for checking block ancestry, the returned function will
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/// return `true` if the given hash (second parameter) is a descendent of the
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/// base (first parameter). If the `current` parameter is defined, it should
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/// represent the current block `hash` and its `parent hash`, if given the
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/// function that's returned will assume that `hash` isn't part of the local DB
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/// yet, and all searches in the DB will instead reference the parent.
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pub fn is_descendent_of<'a, Block: BlockT, T>(
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client: &'a T,
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current: Option<(Block::Hash, Block::Hash)>,
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) -> impl Fn(&Block::Hash, &Block::Hash) -> Result<bool, Error> + 'a
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where T: HeaderBackend<Block> + HeaderMetadata<Block, Error = Error>,
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{
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move |base, hash| {
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if base == hash { return Ok(false); }
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let current = current.as_ref().map(|(c, p)| (c.borrow(), p.borrow()));
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let mut hash = hash;
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if let Some((current_hash, current_parent_hash)) = current {
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if base == current_hash { return Ok(false); }
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if hash == current_hash {
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if base == current_parent_hash {
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return Ok(true);
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} else {
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hash = current_parent_hash;
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}
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}
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}
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let ancestor = sp_blockchain::lowest_common_ancestor(client, *hash, *base)?;
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Ok(ancestor.hash == *base)
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}
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}
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}
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