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//! Data types for working with `rusqlite`.
use rusqlite;
use rusqlite::types::{ToSql, ToSqlOutput, FromSql, FromSqlResult, ValueRef};
use std::fmt;
use std::ops::Add;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use crate::{
Result,
};
/// Represents a row id.
///
/// This is used to represent handles to stored objects.
#[derive(Copy, Clone, PartialEq)]
pub struct ID(i64);
impl fmt::Display for ID {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
impl ID {
/// Returns ID(0).
///
/// This is smaller than all valid ids.
pub fn null() -> Self {
ID(0)
}
/// Returns the largest id.
pub fn max() -> Self {
ID(::std::i64::MAX)
}
}
impl From<i64> for ID {
fn from(id: i64) -> Self {
ID(id)
}
}
impl ToSql for ID {
fn to_sql(&self) -> rusqlite::Result<ToSqlOutput> {
Ok(ToSqlOutput::from(self.0))
}
}
impl FromSql for ID {
fn column_result(value: ValueRef) -> FromSqlResult<Self> {
value.as_i64().map(|id| id.into())
}
}
/// A serializable system time.
///
/// XXX: Drop this. Instead, use chrono::DateTime which implements
/// ToSql and FromSql.
#[derive(Clone, Copy, PartialEq, PartialOrd)]
pub struct Timestamp(SystemTime);
impl Timestamp {
pub fn now() -> Self {
Timestamp(SystemTime::now())
}
/// Converts to unix time.
pub fn unix(&self) -> i64 {
match self.0.duration_since(UNIX_EPOCH) {
Ok(d) if d.as_secs() < std::i64::MAX as u64 =>
d.as_secs() as i64,
_ => 0, // Not representable.
}
}
pub fn duration_since(&self, earlier: Timestamp) -> Result<Duration> {
Ok(self.0.duration_since(earlier.0)?)
}
}
impl ToSql for Timestamp {
fn to_sql(&self) -> rusqlite::Result<ToSqlOutput> {
Ok(ToSqlOutput::from(self.unix()))
}
}
impl FromSql for Timestamp {
fn column_result(value: ValueRef) -> FromSqlResult<Self> {
value.as_i64()
.map(|t| Timestamp(UNIX_EPOCH + Duration::new(t as u64, 0)))
}
}
impl Add<Duration> for Timestamp {
type Output = Timestamp;
fn add(self, other: Duration) -> Timestamp {
Timestamp(self.0 + other)
}
}
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