87 lines
2.2 KiB
Rust
87 lines
2.2 KiB
Rust
//! Core types used in the processing of payments.
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use fpdec::{Dec, Decimal};
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use serde::{Deserialize, Serialize};
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use serde_with::{serde_as, DisplayFromStr};
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/// Clients are anonymous, identified by globally unique ids. "16-bit ought to be enough for
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/// anyone".
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#[derive(
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Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash, Deserialize, Serialize,
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)]
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#[serde(transparent)]
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pub struct ClientId(pub u16);
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impl std::fmt::Display for ClientId {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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self.0.fmt(f)
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}
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}
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/// Transactions are identified by a globally unique id. 32 bit is sufficient for our puposes.
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#[derive(
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Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Hash, Deserialize, Serialize,
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)]
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#[serde(transparent)]
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pub struct TxId(pub u32);
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impl std::fmt::Display for TxId {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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self.0.fmt(f)
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}
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}
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/// Amounts are represented as exact decimals, up to four places past the decimal.
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/// For ease of implementation, make use of [fpdec::Decimal] instead of implementing a custom
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/// fixed-point number.
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#[serde_as]
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#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord, Deserialize, Serialize)]
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#[serde(transparent)]
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pub struct TxAmount(#[serde_as(as = "DisplayFromStr")] pub Decimal);
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impl TxAmount {
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pub const ZERO: Self = Self(Dec!(0));
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}
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impl std::fmt::Display for TxAmount {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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self.0.fmt(f)
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}
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}
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impl std::ops::Add<TxAmount> for TxAmount {
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type Output = Self;
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fn add(self, rhs: TxAmount) -> Self::Output {
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Self(self.0 + rhs.0)
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}
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}
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impl std::ops::AddAssign<TxAmount> for TxAmount {
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fn add_assign(&mut self, rhs: TxAmount) {
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*self = *self + rhs;
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}
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}
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impl std::ops::Sub<TxAmount> for TxAmount {
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type Output = Self;
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fn sub(self, rhs: TxAmount) -> Self::Output {
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Self(self.0 - rhs.0)
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}
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}
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impl std::ops::SubAssign<TxAmount> for TxAmount {
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fn sub_assign(&mut self, rhs: TxAmount) {
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*self = *self - rhs;
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}
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}
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impl std::ops::Neg for TxAmount {
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type Output = Self;
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fn neg(self) -> Self::Output {
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Self(-self.0)
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}
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}
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