mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Bastian Köcher
74 lines
2.3 KiB
Rust
74 lines
2.3 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2020-2022 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
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// This program 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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// This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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//! Substrate offchain API.
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#[cfg(test)]
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mod tests;
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use self::error::{Error, Result};
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use parking_lot::RwLock;
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/// Re-export the API for backward compatibility.
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pub use sc_rpc_api::offchain::*;
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use sc_rpc_api::DenyUnsafe;
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use sp_core::{
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offchain::{OffchainStorage, StorageKind},
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Bytes,
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};
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use std::sync::Arc;
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/// Offchain API
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#[derive(Debug)]
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pub struct Offchain<T: OffchainStorage> {
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/// Offchain storage
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storage: Arc<RwLock<T>>,
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deny_unsafe: DenyUnsafe,
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}
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impl<T: OffchainStorage> Offchain<T> {
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/// Create new instance of Offchain API.
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pub fn new(storage: T, deny_unsafe: DenyUnsafe) -> Self {
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Offchain { storage: Arc::new(RwLock::new(storage)), deny_unsafe }
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}
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}
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impl<T: OffchainStorage + 'static> OffchainApi for Offchain<T> {
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/// Set offchain local storage under given key and prefix.
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fn set_local_storage(&self, kind: StorageKind, key: Bytes, value: Bytes) -> Result<()> {
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self.deny_unsafe.check_if_safe()?;
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let prefix = match kind {
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StorageKind::PERSISTENT => sp_offchain::STORAGE_PREFIX,
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StorageKind::LOCAL => return Err(Error::UnavailableStorageKind),
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};
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self.storage.write().set(prefix, &*key, &*value);
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Ok(())
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}
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/// Get offchain local storage under given key and prefix.
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fn get_local_storage(&self, kind: StorageKind, key: Bytes) -> Result<Option<Bytes>> {
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self.deny_unsafe.check_if_safe()?;
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let prefix = match kind {
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StorageKind::PERSISTENT => sp_offchain::STORAGE_PREFIX,
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StorageKind::LOCAL => return Err(Error::UnavailableStorageKind),
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};
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Ok(self.storage.read().get(prefix, &*key).map(Into::into))
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}
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}
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