mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-07 13:08:03 +00:00
Pierre Krieger
41 lines
1.4 KiB
Rust
41 lines
1.4 KiB
Rust
// Copyright 2018-2019 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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use futures::{prelude::*, sync::oneshot};
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/// Wraps around `oneshot::Receiver` and adjusts the error type to produce an internal error if the
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/// sender gets dropped.
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pub struct Receiver<T>(pub oneshot::Receiver<T>);
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impl<T> Future for Receiver<T> {
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type Item = T;
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type Error = jsonrpc_core::Error;
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fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
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self.0.poll().map_err(|_| jsonrpc_core::Error::internal_error())
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}
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}
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/// Unwraps the trailing parameter or falls back with the closure result.
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pub fn unwrap_or_else<F, H, E>(or_else: F, optional: Option<H>) -> Result<H, E> where
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F: FnOnce() -> Result<H, E>,
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{
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match optional.into() {
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None => or_else(),
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Some(x) => Ok(x),
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}
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}
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