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92 lines
3.3 KiB
Rust
92 lines
3.3 KiB
Rust
use crate::structs::CommunityFollowerView;
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use chrono::Utc;
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use diesel::{
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dsl::{count_star, not},
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result::Error,
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ExpressionMethods,
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QueryDsl,
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};
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use diesel_async::RunQueryDsl;
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use lemmy_db_schema::{
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newtypes::{CommunityId, DbUrl, InstanceId, PersonId},
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schema::{community, community_follower, person},
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utils::{functions::coalesce, get_conn, DbPool},
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};
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impl CommunityFollowerView {
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/// return a list of local community ids and remote inboxes that at least one user of the given
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/// instance has followed
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pub async fn get_instance_followed_community_inboxes(
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pool: &mut DbPool<'_>,
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instance_id: InstanceId,
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published_since: chrono::DateTime<Utc>,
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) -> Result<Vec<(CommunityId, DbUrl)>, Error> {
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let conn = &mut get_conn(pool).await?;
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// In most cases this will fetch the same url many times (the shared inbox url)
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// PG will only send a single copy to rust, but it has to scan through all follower rows (same
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// as it was before). So on the PG side it would be possible to optimize this further by
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// adding e.g. a new table community_followed_instances (community_id, instance_id)
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// that would work for all instances that support fully shared inboxes.
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// It would be a bit more complicated though to keep it in sync.
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community_follower::table
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.inner_join(community::table)
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.inner_join(person::table)
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.filter(person::instance_id.eq(instance_id))
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.filter(community::local) // this should be a no-op since community_followers table only has
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// local-person+remote-community or remote-person+local-community
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.filter(not(person::local))
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.filter(community_follower::published.gt(published_since.naive_utc()))
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.select((
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community::id,
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coalesce(person::shared_inbox_url, person::inbox_url),
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))
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.distinct() // only need each community_id, inbox combination once
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.load::<(CommunityId, DbUrl)>(conn)
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.await
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}
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pub async fn get_community_follower_inboxes(
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pool: &mut DbPool<'_>,
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community_id: CommunityId,
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) -> Result<Vec<DbUrl>, Error> {
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let conn = &mut get_conn(pool).await?;
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let res = community_follower::table
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.filter(community_follower::community_id.eq(community_id))
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.filter(not(person::local))
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.inner_join(person::table)
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.select(coalesce(person::shared_inbox_url, person::inbox_url))
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.distinct()
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.load::<DbUrl>(conn)
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.await?;
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Ok(res)
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}
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pub async fn count_community_followers(
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pool: &mut DbPool<'_>,
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community_id: CommunityId,
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) -> Result<i64, Error> {
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let conn = &mut get_conn(pool).await?;
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let res = community_follower::table
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.filter(community_follower::community_id.eq(community_id))
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.select(count_star())
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.first::<i64>(conn)
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.await?;
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Ok(res)
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}
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pub async fn for_person(pool: &mut DbPool<'_>, person_id: PersonId) -> Result<Vec<Self>, Error> {
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let conn = &mut get_conn(pool).await?;
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community_follower::table
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.inner_join(community::table)
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.inner_join(person::table)
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.select((community::all_columns, person::all_columns))
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.filter(community_follower::person_id.eq(person_id))
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.filter(community::deleted.eq(false))
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.filter(community::removed.eq(false))
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.order_by(community::title)
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.load::<CommunityFollowerView>(conn)
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.await
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}
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}
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