mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-27 02:17:58 +00:00
Sergei Shulepov
3ec4844616
* Make NumberOrHex a common primitive. * Update primitives/rpc/src/number.rs Co-authored-by: Nikolay Volf <nikvolf@gmail.com> Co-authored-by: Nikolay Volf <nikvolf@gmail.com>
106 lines
3.1 KiB
Rust
106 lines
3.1 KiB
Rust
// This file is part of Substrate.
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// Copyright (C) 2017-2020 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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//! A number type that can be serialized both as a number or a string that encodes a number in a
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//! string.
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use std::{convert::TryFrom, fmt::Debug};
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use serde::{Serialize, Deserialize};
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use sp_core::U256;
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/// A number type that can be serialized both as a number or a string that encodes a number in a
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/// string.
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///
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/// We allow two representations of the block number as input. Either we deserialize to the type
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/// that is specified in the block type or we attempt to parse given hex value.
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///
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/// The primary motivation for having this type is to avoid overflows when using big integers in
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/// JavaScript (which we consider as an important RPC API consumer).
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#[derive(Copy, Clone, Serialize, Deserialize, Debug, PartialEq)]
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#[serde(untagged)]
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pub enum NumberOrHex {
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/// The number represented directly.
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Number(u64),
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/// Hex representation of the number.
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Hex(U256),
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}
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impl NumberOrHex {
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/// Converts this number into an U256.
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pub fn into_u256(self) -> U256 {
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match self {
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NumberOrHex::Number(n) => n.into(),
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NumberOrHex::Hex(h) => h,
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}
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}
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}
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impl From<u64> for NumberOrHex {
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fn from(n: u64) -> Self {
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NumberOrHex::Number(n)
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}
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}
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impl From<U256> for NumberOrHex {
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fn from(n: U256) -> Self {
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NumberOrHex::Hex(n)
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}
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}
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/// An error type that signals an out-of-range conversion attempt.
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pub struct TryFromIntError(pub(crate) ());
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impl TryFrom<NumberOrHex> for u32 {
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type Error = TryFromIntError;
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fn try_from(num_or_hex: NumberOrHex) -> Result<u32, TryFromIntError> {
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let num_or_hex = num_or_hex.into_u256();
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if num_or_hex > U256::from(u32::max_value()) {
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return Err(TryFromIntError(()));
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} else {
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Ok(num_or_hex.as_u32())
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}
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}
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}
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impl TryFrom<NumberOrHex> for u64 {
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type Error = TryFromIntError;
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fn try_from(num_or_hex: NumberOrHex) -> Result<u64, TryFromIntError> {
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let num_or_hex = num_or_hex.into_u256();
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if num_or_hex > U256::from(u64::max_value()) {
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return Err(TryFromIntError(()));
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} else {
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Ok(num_or_hex.as_u64())
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}
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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#""0x1234""#, NumberOrHex::Hex(0x1234.into()));
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assert_deser(r#""0x0""#, NumberOrHex::Hex(0.into()));
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assert_deser(r#"5"#, NumberOrHex::Number(5));
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assert_deser(r#"10000"#, NumberOrHex::Number(10000));
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assert_deser(r#"0"#, NumberOrHex::Number(0));
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assert_deser(r#"1000000000000"#, NumberOrHex::Number(1000000000000));
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}
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}
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