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Add a DateTime32 type for 32-bit serialized times (#2210)
* Add a DateTime32 type for 32-bit serialized times * Use DateTime32 for MetaAddr.last_seen * Create and use a `DateTime32::now` method
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,109 @@ | ||
| //! DateTime types with specific serialization invariants. | ||
| use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt}; | ||
| use chrono::{TimeZone, Utc}; | ||
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| use std::{ | ||
| convert::{TryFrom, TryInto}, | ||
| fmt, | ||
| num::TryFromIntError, | ||
| }; | ||
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|
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| use super::{SerializationError, ZcashDeserialize, ZcashSerialize}; | ||
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| /// A date and time, represented by a 32-bit number of seconds since the UNIX epoch. | ||
| #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)] | ||
| pub struct DateTime32 { | ||
| timestamp: u32, | ||
| } | ||
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| impl DateTime32 { | ||
| /// Returns the number of seconds since the UNIX epoch. | ||
| pub fn timestamp(&self) -> u32 { | ||
| self.timestamp | ||
| } | ||
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| /// Returns the equivalent [`chrono::DateTime`]. | ||
| pub fn to_chrono(self) -> chrono::DateTime<Utc> { | ||
| self.into() | ||
| } | ||
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| /// Returns the current time | ||
| pub fn now() -> DateTime32 { | ||
| Utc::now() | ||
| .try_into() | ||
| .expect("unexpected out of range chrono::DateTime") | ||
| } | ||
| } | ||
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| impl fmt::Debug for DateTime32 { | ||
| fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { | ||
| f.debug_struct("DateTime32") | ||
| .field("timestamp", &self.timestamp) | ||
| .field("calendar", &chrono::DateTime::<Utc>::from(*self)) | ||
| .finish() | ||
| } | ||
| } | ||
|
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| impl From<u32> for DateTime32 { | ||
| fn from(value: u32) -> Self { | ||
| DateTime32 { timestamp: value } | ||
| } | ||
| } | ||
|
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| impl From<&u32> for DateTime32 { | ||
| fn from(value: &u32) -> Self { | ||
| (*value).into() | ||
| } | ||
| } | ||
|
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| impl From<DateTime32> for chrono::DateTime<Utc> { | ||
| fn from(value: DateTime32) -> Self { | ||
| // chrono::DateTime is guaranteed to hold 32-bit values | ||
| Utc.timestamp(value.timestamp.into(), 0) | ||
| } | ||
| } | ||
|
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| impl From<&DateTime32> for chrono::DateTime<Utc> { | ||
| fn from(value: &DateTime32) -> Self { | ||
| (*value).into() | ||
| } | ||
| } | ||
|
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| impl TryFrom<chrono::DateTime<Utc>> for DateTime32 { | ||
| type Error = TryFromIntError; | ||
|
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| /// Convert from a [`chrono::DateTime`] to a [`DateTime32`], discarding any nanoseconds. | ||
| /// | ||
| /// Conversion fails if the number of seconds is outside the `u32` range. | ||
| fn try_from(value: chrono::DateTime<Utc>) -> Result<Self, Self::Error> { | ||
| Ok(Self { | ||
| timestamp: value.timestamp().try_into()?, | ||
| }) | ||
| } | ||
| } | ||
|
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| impl TryFrom<&chrono::DateTime<Utc>> for DateTime32 { | ||
| type Error = TryFromIntError; | ||
|
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| /// Convert from a [`chrono::DateTime`] to a [`DateTime32`], discarding any nanoseconds. | ||
| /// | ||
| /// Conversion fails if the number of seconds is outside the `u32` range. | ||
| fn try_from(value: &chrono::DateTime<Utc>) -> Result<Self, Self::Error> { | ||
| (*value).try_into() | ||
| } | ||
| } | ||
|
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| impl ZcashSerialize for DateTime32 { | ||
| fn zcash_serialize<W: std::io::Write>(&self, mut writer: W) -> Result<(), std::io::Error> { | ||
| writer.write_u32::<LittleEndian>(self.timestamp) | ||
| } | ||
| } | ||
|
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| impl ZcashDeserialize for DateTime32 { | ||
| fn zcash_deserialize<R: std::io::Read>(mut reader: R) -> Result<Self, SerializationError> { | ||
| Ok(DateTime32 { | ||
| timestamp: reader.read_u32::<LittleEndian>()?, | ||
| }) | ||
| } | ||
| } |
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