mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-04-30 02:37:58 +00:00
Shawn Tabrizi
90 lines
2.8 KiB
Rust
90 lines
2.8 KiB
Rust
// Copyright 2017-2020 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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//! Chain RPC Block number type.
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use serde::{Serialize, Deserialize};
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use std::{convert::TryFrom, fmt::Debug};
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use sp_core::U256;
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/// RPC Block number type
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///
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/// We allow two representations of the block number as input.
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/// Either we deserialize to the type that is specified in the block type
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/// or we attempt to parse given hex value.
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/// We do that for consistency with the returned type, default generic header
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/// serializes block number as hex to avoid overflows in JavaScript.
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#[derive(Serialize, Deserialize, Debug, PartialEq)]
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#[serde(untagged)]
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pub enum NumberOrHex<Number> {
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/// The original header number type of block.
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Number(Number),
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/// Hex representation of the block number.
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Hex(U256),
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}
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impl<Number: TryFrom<u64> + From<u32> + Debug + PartialOrd> NumberOrHex<Number> {
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/// Attempts to convert into concrete block number.
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///
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/// Fails in case hex number is too big.
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pub fn to_number(self) -> Result<Number, String> {
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let num = match self {
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NumberOrHex::Number(n) => n,
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NumberOrHex::Hex(h) => {
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let l = h.low_u64();
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if U256::from(l) != h {
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return Err(format!("`{}` does not fit into u64 type; unsupported for now.", h))
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} else {
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Number::try_from(l)
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.map_err(|_| format!("`{}` does not fit into block number type.", h))?
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}
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},
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};
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// FIXME <2329>: Database seems to limit the block number to u32 for no reason
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if num > Number::from(u32::max_value()) {
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return Err(format!("`{:?}` > u32::max_value(), the max block number is u32.", num))
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}
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Ok(num)
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}
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}
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impl From<u64> for NumberOrHex<u64> {
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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<Number> From<U256> for NumberOrHex<Number> {
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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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#[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::<u128>::Hex(0x1234.into()));
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assert_deser(r#""0x0""#, NumberOrHex::<u64>::Hex(0.into()));
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assert_deser(r#"5"#, NumberOrHex::Number(5_u64));
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assert_deser(r#"10000"#, NumberOrHex::Number(10000_u32));
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assert_deser(r#"0"#, NumberOrHex::Number(0_u16));
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}
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}
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