mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
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Bastian Köcher
77 lines
2.3 KiB
Rust
77 lines
2.3 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2019-2022 Parity Technologies (UK) Ltd.
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// SPDX-License-Identifier: Apache-2.0
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//! RPC a lenient list or value type.
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use serde::{Deserialize, Serialize};
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/// RPC list or value wrapper.
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///
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/// For some RPCs it's convenient to call them with either
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/// a single value or a whole list of values to get a proper response.
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/// In theory you could do a batch query, but it's:
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/// 1. Less convenient in client libraries
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/// 2. If the response value is small, the protocol overhead might be dominant.
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///
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/// Also it's nice to be able to maintain backward compatibility for methods that
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/// were initially taking a value and now we want to expand them to take a list.
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#[derive(Serialize, Deserialize, Debug, PartialEq)]
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#[serde(untagged)]
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pub enum ListOrValue<T> {
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/// A list of values of given type.
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List(Vec<T>),
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/// A single value of given type.
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Value(T),
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}
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impl<T> ListOrValue<T> {
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/// Map every contained value using function `F`.
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///
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/// This allows to easily convert all values in any of the variants.
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pub fn map<F: Fn(T) -> X, X>(self, f: F) -> ListOrValue<X> {
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match self {
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ListOrValue::List(v) => ListOrValue::List(v.into_iter().map(f).collect()),
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ListOrValue::Value(v) => ListOrValue::Value(f(v)),
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}
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}
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}
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impl<T> From<T> for ListOrValue<T> {
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fn from(n: T) -> Self {
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ListOrValue::Value(n)
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}
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}
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impl<T> From<Vec<T>> for ListOrValue<T> {
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fn from(n: Vec<T>) -> Self {
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ListOrValue::List(n)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::assert_deser;
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#[test]
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fn should_serialize_and_deserialize() {
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assert_deser(r#"5"#, ListOrValue::Value(5_u64));
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assert_deser(r#""str""#, ListOrValue::Value("str".to_string()));
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assert_deser(r#"[1,2,3]"#, ListOrValue::List(vec![1_u64, 2_u64, 3_u64]));
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}
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}
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