mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-09 19:57:59 +00:00
Stanislav Tkach
71 lines
2.1 KiB
Rust
71 lines
2.1 KiB
Rust
// Copyright 2017-2019 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 serde_derive::Deserialize;
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use primitives::U256;
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use runtime_primitives::traits;
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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(Deserialize)]
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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: traits::As<u64>> 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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match self {
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NumberOrHex::Number(n) => Ok(n),
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NumberOrHex::Hex(h) => {
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// FIXME #1377 this only supports `u64` since `BlockNumber`
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// is `As<u64>` we could possibly go with `u128`.
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let l = h.low_u64();
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if U256::from(l) != h {
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Err(format!("`{}` does not fit into the block number type.", h))
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} else {
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Ok(traits::As::sa(l))
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}
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},
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}
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}
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}
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#[cfg(test)]
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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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#[cfg(test)]
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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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