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round.rs
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round.rs
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use crate::error::Error;
use crate::prelude::*;
use core::convert::TryInto;
use core::{
convert::TryFrom,
fmt::{self, Debug, Display},
str::FromStr,
};
use serde::{de::Error as _, Deserialize, Deserializer, Serialize, Serializer};
/// Block round for a particular chain
#[derive(Copy, Clone, Default, Eq, Hash, PartialEq, PartialOrd, Ord)]
pub struct Round(u32);
impl TryFrom<i32> for Round {
type Error = Error;
fn try_from(value: i32) -> Result<Self, Self::Error> {
Ok(Round(value.try_into().map_err(Error::negative_round)?))
}
}
impl From<Round> for i32 {
fn from(value: Round) -> Self {
value.value() as i32 // does not overflow. The value is <= i32::MAX
}
}
impl TryFrom<u32> for Round {
type Error = Error;
fn try_from(value: u32) -> Result<Self, Self::Error> {
let _val: i32 = value.try_into().map_err(Error::integer_overflow)?;
Ok(Round(value))
}
}
impl From<Round> for u32 {
fn from(value: Round) -> Self {
value.value()
}
}
impl From<u16> for Round {
fn from(value: u16) -> Self {
Round(value as u32)
}
}
impl From<u8> for Round {
fn from(value: u8) -> Self {
Round(value as u32)
}
}
impl Round {
/// Get inner integer value. Alternative to `.0` or `.into()`
pub fn value(&self) -> u32 {
self.0
}
/// Increment the block round by 1
pub fn increment(self) -> Self {
Round::try_from(self.0.checked_add(1).expect("round overflow")).unwrap()
}
}
impl Debug for Round {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "block::Round({})", self.0)
}
}
impl Display for Round {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl FromStr for Round {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Error> {
Round::try_from(
s.parse::<u32>()
.map_err(|e| Error::parse_int(s.to_string(), e))?,
)
}
}
impl<'de> Deserialize<'de> for Round {
fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> {
Self::from_str(&String::deserialize(deserializer)?)
.map_err(|e| D::Error::custom(format!("{}", e)))
}
}
impl Serialize for Round {
fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
u32::from(*self).to_string().serialize(serializer)
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn increment_by_one() {
assert_eq!(Round::default().increment().value(), 1);
}
#[test]
fn avoid_try_unwrap_dance() {
assert_eq!(
Round::try_from(2_u32).unwrap().value(),
Round::from(2_u16).value()
);
}
}