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use max(id) instead of seq max value to prevent uncommitted transactions from causing skipped activities

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This commit is contained in:
phiresky 2023-09-20 14:51:40 +00:00
parent 3d649e1d3e
commit a808d3208a
1 changed files with 5 additions and 22 deletions
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27
crates/federate/src/util.rs
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@ -1,8 +1,5 @@
use anyhow::{anyhow, Context, Result};
use diesel::{
prelude::*,
sql_types::{Bool, Int8},
};
use diesel::prelude::*;
use diesel_async::RunQueryDsl;
use lemmy_apub::{
activity_lists::SharedInboxActivities,
@ -191,17 +188,11 @@ pub(crate) async fn get_latest_activity_id(pool: &mut DbPool<'_>) -> Result<Acti
});
CACHE
.try_get_with((), async {
use diesel::dsl::max;
use lemmy_db_schema::schema::sent_activity::dsl::{id, sent_activity};
let conn = &mut get_conn(pool).await?;
let seq: Sequence =
diesel::sql_query("select last_value, is_called from sent_activity_id_seq")
.get_result(conn)
.await?;
let latest_id = if seq.is_called {
seq.last_value as ActivityId
} else {
// if a PG sequence has never been used, last_value will actually be next_value
(seq.last_value - 1) as ActivityId
};
let seq: Option<ActivityId> = sent_activity.select(max(id)).get_result(conn).await?;
let latest_id = seq.unwrap_or(0);
anyhow::Result::<_, anyhow::Error>::Ok(latest_id as ActivityId)
})
.await
@ -212,11 +203,3 @@ pub(crate) async fn get_latest_activity_id(pool: &mut DbPool<'_>) -> Result<Acti
pub(crate) fn retry_sleep_duration(retry_count: i32) -> Duration {
Duration::from_secs_f64(10.0 * 2.0_f64.powf(f64::from(retry_count)))
}
#[derive(QueryableByName)]
struct Sequence {
#[diesel(sql_type = Int8)]
last_value: i64, // this value is bigint for some reason even if sequence is int4
#[diesel(sql_type = Bool)]
is_called: bool,
}