mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-26 20:27:58 +00:00
Pierre Krieger
46 lines
1.6 KiB
Rust
46 lines
1.6 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2020 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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use crate::host::{HostContext, HostState};
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scoped_tls::scoped_thread_local!(static HOST_STATE: HostState);
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/// Provide `HostState` for the runtime method call and execute the given function `f`.
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///
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/// During the execution of the provided function `with_context` will be callable.
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pub fn with_initialized_state<R, F>(s: &HostState, f: F) -> R
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where
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F: FnOnce() -> R,
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{
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HOST_STATE.set(s, f)
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}
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/// Create a `HostContext` from the contained `HostState` and execute the given function `f`.
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///
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/// This function is only callable within closure passed to `init_state`. Otherwise, the passed
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/// context will be `None`.
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pub fn with_context<R, F>(f: F) -> R
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where
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F: FnOnce(Option<HostContext>) -> R,
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{
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if !HOST_STATE.is_set() {
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return f(None)
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}
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HOST_STATE.with(|state| f(Some(state.materialize())))
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}
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