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extern crate time;
use std::io::Write;
use self::time::{Duration, Timespec};
use deserialize::{self, FromSql};
use pg::Pg;
use serialize::{self, Output, ToSql};
use sql_types;
#[derive(FromSqlRow, AsExpression)]
#[diesel(foreign_derive)]
#[sql_type = "sql_types::Timestamp"]
#[allow(dead_code)]
struct TimespecProxy(Timespec);
const TIME_SEC_CONV: i64 = 946_684_800;
impl ToSql<sql_types::Timestamp, Pg> for Timespec {
fn to_sql<W: Write>(&self, out: &mut Output<W, Pg>) -> serialize::Result {
let pg_epoch = Timespec::new(TIME_SEC_CONV, 0);
let duration = *self - pg_epoch;
let t = duration.num_microseconds().ok_or("Overflow error")?;
ToSql::<sql_types::BigInt, Pg>::to_sql(&t, out)
}
}
impl FromSql<sql_types::Timestamp, Pg> for Timespec {
fn from_sql(bytes: Option<&[u8]>) -> deserialize::Result<Self> {
let t = <i64 as FromSql<sql_types::BigInt, Pg>>::from_sql(bytes)?;
let pg_epoch = Timespec::new(TIME_SEC_CONV, 0);
let duration = Duration::microseconds(t);
let out = pg_epoch + duration;
Ok(out)
}
}
#[cfg(test)]
mod tests {
extern crate dotenv;
extern crate time;
use self::dotenv::dotenv;
use self::time::{Duration, Timespec};
use dsl::{now, sql};
use prelude::*;
use select;
use sql_types::Timestamp;
fn connection() -> PgConnection {
dotenv().ok();
let connection_url = ::std::env::var("PG_DATABASE_URL")
.or_else(|_| ::std::env::var("DATABASE_URL"))
.expect("DATABASE_URL must be set in order to run tests");
PgConnection::establish(&connection_url).unwrap()
}
#[test]
fn unix_epoch_encodes_correctly() {
let connection = connection();
let query = select(sql::<Timestamp>("'1970-01-01'").eq(Timespec::new(0, 0)));
assert!(query.get_result::<bool>(&connection).unwrap());
}
#[test]
fn unix_epoch_decodes_correctly() {
let connection = connection();
let epoch_from_sql =
select(sql::<Timestamp>("'1970-01-01'::timestamp")).get_result::<Timespec>(&connection);
assert_eq!(Ok(Timespec::new(0, 0)), epoch_from_sql);
}
#[test]
fn times_relative_to_now_encode_correctly() {
let connection = connection();
let time = time::now_utc().to_timespec() + Duration::seconds(60);
let query = select(now.at_time_zone("utc").lt(time));
assert!(query.get_result::<bool>(&connection).unwrap());
let time = time::now_utc().to_timespec() - Duration::seconds(60);
let query = select(now.at_time_zone("utc").gt(time));
assert!(query.get_result::<bool>(&connection).unwrap());
}
}