mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-11-21 14:17:08 +00:00
Fix Posts List Performance + cursor-based pagination (#3872)
* add token-based pagination + fast subscribed post view * add migrations * fix failing heuristic * revert * output pagination token as next_page, fix off-by-one, restructure * more cleanup * clean * format sql * fix comment * fix tests * e * empty * move last page thing * restructure a bit for readability * rename page_cursor * update for scaled sort * fix * sql format * fix * get rid of macros --------- Co-authored-by: Dessalines <dessalines@users.noreply.github.com>
This commit is contained in:
phiresky
GitHub
parent
6735a98d35
commit
544d30f0d4
|
|
@ -5,7 +5,7 @@ use lemmy_db_schema::{
|
|||
PostFeatureType,
|
||||
SortType,
|
||||
};
|
||||
use lemmy_db_views::structs::{PostReportView, PostView};
|
||||
use lemmy_db_views::structs::{PaginationCursor, PostReportView, PostView};
|
||||
use lemmy_db_views_actor::structs::{CommunityModeratorView, CommunityView};
|
||||
use serde::{Deserialize, Serialize};
|
||||
use serde_with::skip_serializing_none;
|
||||
|
|
@ -70,6 +70,7 @@ pub struct GetPostResponse {
|
|||
pub struct GetPosts {
|
||||
pub type_: Option<ListingType>,
|
||||
pub sort: Option<SortType>,
|
||||
/// DEPRECATED, use page_cursor
|
||||
pub page: Option<i64>,
|
||||
pub limit: Option<i64>,
|
||||
pub community_id: Option<CommunityId>,
|
||||
|
|
@ -78,6 +79,7 @@ pub struct GetPosts {
|
|||
pub liked_only: Option<bool>,
|
||||
pub disliked_only: Option<bool>,
|
||||
pub auth: Option<Sensitive<String>>,
|
||||
pub page_cursor: Option<PaginationCursor>,
|
||||
}
|
||||
|
||||
#[derive(Serialize, Deserialize, Debug, Clone)]
|
||||
|
|
@ -86,6 +88,8 @@ pub struct GetPosts {
|
|||
/// The post list response.
|
||||
pub struct GetPostsResponse {
|
||||
pub posts: Vec<PostView>,
|
||||
/// the pagination cursor to use to fetch the next page
|
||||
pub next_page: Option<PaginationCursor>,
|
||||
}
|
||||
|
||||
#[derive(Debug, Serialize, Deserialize, Clone, Default)]
|
||||
|
|
|
|||
|
|
@ -11,7 +11,10 @@ use lemmy_api_common::{
|
|||
utils::{check_private_instance, local_user_view_from_jwt_opt_new},
|
||||
};
|
||||
use lemmy_db_schema::source::{community::Community, local_site::LocalSite};
|
||||
use lemmy_db_views::{post_view::PostQuery, structs::LocalUserView};
|
||||
use lemmy_db_views::{
|
||||
post_view::PostQuery,
|
||||
structs::{LocalUserView, PaginationCursor},
|
||||
};
|
||||
use lemmy_utils::error::{LemmyError, LemmyErrorExt, LemmyErrorType};
|
||||
|
||||
#[tracing::instrument(skip(context))]
|
||||
|
|
@ -48,6 +51,12 @@ pub async fn list_posts(
|
|||
&local_site,
|
||||
community_id,
|
||||
)?);
|
||||
// parse pagination token
|
||||
let page_after = if let Some(pa) = &data.page_cursor {
|
||||
Some(pa.read(&mut context.pool()).await?)
|
||||
} else {
|
||||
None
|
||||
};
|
||||
|
||||
let posts = PostQuery {
|
||||
local_user: local_user_view.as_ref(),
|
||||
|
|
@ -58,6 +67,7 @@ pub async fn list_posts(
|
|||
liked_only,
|
||||
disliked_only,
|
||||
page,
|
||||
page_after,
|
||||
limit,
|
||||
..Default::default()
|
||||
}
|
||||
|
|
@ -65,5 +75,7 @@ pub async fn list_posts(
|
|||
.await
|
||||
.with_lemmy_type(LemmyErrorType::CouldntGetPosts)?;
|
||||
|
||||
Ok(Json(GetPostsResponse { posts }))
|
||||
// if this page wasn't empty, then there is a next page after the last post on this page
|
||||
let next_page = posts.last().map(PaginationCursor::after_post);
|
||||
Ok(Json(GetPostsResponse { posts, next_page }))
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,21 +1,26 @@
|
|||
use crate::structs::{LocalUserView, PostView};
|
||||
use crate::structs::{LocalUserView, PaginationCursor, PostView};
|
||||
use diesel::{
|
||||
debug_query,
|
||||
dsl::{exists, not, IntervalDsl},
|
||||
dsl::{self, exists, not, IntervalDsl},
|
||||
expression::AsExpression,
|
||||
pg::Pg,
|
||||
result::Error,
|
||||
sql_function,
|
||||
sql_types::{self, Timestamptz},
|
||||
sql_types::{self, SingleValue, SqlType, Timestamptz},
|
||||
BoolExpressionMethods,
|
||||
BoxableExpression,
|
||||
Expression,
|
||||
ExpressionMethods,
|
||||
IntoSql,
|
||||
JoinOnDsl,
|
||||
NullableExpressionMethods,
|
||||
OptionalExtension,
|
||||
PgTextExpressionMethods,
|
||||
QueryDsl,
|
||||
};
|
||||
use diesel_async::RunQueryDsl;
|
||||
use lemmy_db_schema::{
|
||||
aggregates::structs::PostAggregates,
|
||||
newtypes::{CommunityId, LocalUserId, PersonId, PostId},
|
||||
schema::{
|
||||
community,
|
||||
|
|
@ -28,12 +33,12 @@ use lemmy_db_schema::{
|
|||
person_block,
|
||||
person_post_aggregates,
|
||||
post,
|
||||
post_aggregates,
|
||||
post_aggregates::{self, newest_comment_time},
|
||||
post_like,
|
||||
post_read,
|
||||
post_saved,
|
||||
},
|
||||
utils::{fuzzy_search, limit_and_offset, DbConn, DbPool, ListFn, Queries, ReadFn},
|
||||
utils::{fuzzy_search, get_conn, limit_and_offset, DbConn, DbPool, ListFn, Queries, ReadFn},
|
||||
ListingType,
|
||||
SortType,
|
||||
};
|
||||
|
|
@ -41,6 +46,55 @@ use tracing::debug;
|
|||
|
||||
sql_function!(fn coalesce(x: sql_types::Nullable<sql_types::BigInt>, y: sql_types::BigInt) -> sql_types::BigInt);
|
||||
|
||||
fn order_and_page_filter_desc<Q, C, T>(
|
||||
query: Q,
|
||||
column: C,
|
||||
options: &PostQuery,
|
||||
getter: impl Fn(&PostAggregates) -> T,
|
||||
) -> Q
|
||||
where
|
||||
Q: diesel::query_dsl::methods::ThenOrderDsl<dsl::Desc<C>, Output = Q>
|
||||
+ diesel::query_dsl::methods::ThenOrderDsl<dsl::Asc<C>, Output = Q>
|
||||
+ diesel::query_dsl::methods::FilterDsl<dsl::GtEq<C, T>, Output = Q>
|
||||
+ diesel::query_dsl::methods::FilterDsl<dsl::LtEq<C, T>, Output = Q>,
|
||||
C: Expression + Copy,
|
||||
C::SqlType: SingleValue + SqlType,
|
||||
T: AsExpression<C::SqlType>,
|
||||
{
|
||||
let mut query = query.then_order_by(column.desc());
|
||||
if let Some(before) = &options.page_before_or_equal {
|
||||
query = query.filter(column.ge(getter(&before.0)));
|
||||
}
|
||||
if let Some(after) = &options.page_after {
|
||||
query = query.filter(column.le(getter(&after.0)));
|
||||
}
|
||||
query
|
||||
}
|
||||
|
||||
fn order_and_page_filter_asc<Q, C, T>(
|
||||
query: Q,
|
||||
column: C,
|
||||
options: &PostQuery,
|
||||
getter: impl Fn(&PostAggregates) -> T,
|
||||
) -> Q
|
||||
where
|
||||
Q: diesel::query_dsl::methods::ThenOrderDsl<dsl::Asc<C>, Output = Q>
|
||||
+ diesel::query_dsl::methods::FilterDsl<dsl::LtEq<C, T>, Output = Q>
|
||||
+ diesel::query_dsl::methods::FilterDsl<dsl::GtEq<C, T>, Output = Q>,
|
||||
C: Expression + Copy,
|
||||
C::SqlType: SingleValue + SqlType,
|
||||
T: AsExpression<C::SqlType>,
|
||||
{
|
||||
let mut query = query.then_order_by(column.asc());
|
||||
if let Some(before) = &options.page_before_or_equal {
|
||||
query = query.filter(column.le(getter(&before.0)));
|
||||
}
|
||||
if let Some(after) = &options.page_after {
|
||||
query = query.filter(column.ge(getter(&after.0)));
|
||||
}
|
||||
query
|
||||
}
|
||||
|
||||
fn queries<'a>() -> Queries<
|
||||
impl ReadFn<'a, PostView, (PostId, Option<PersonId>, bool)>,
|
||||
impl ListFn<'a, PostView, PostQuery<'a>>,
|
||||
|
|
@ -251,13 +305,18 @@ fn queries<'a>() -> Queries<
|
|||
.filter(community::removed.eq(false))
|
||||
.filter(post::removed.eq(false));
|
||||
}
|
||||
|
||||
if options.community_id.is_none() {
|
||||
query = query.then_order_by(post_aggregates::featured_local.desc());
|
||||
} else if let Some(community_id) = options.community_id {
|
||||
query = query
|
||||
.filter(post_aggregates::community_id.eq(community_id))
|
||||
.then_order_by(post_aggregates::featured_community.desc());
|
||||
if options.community_id.is_none() || options.community_id_just_for_prefetch {
|
||||
query = order_and_page_filter_desc(query, post_aggregates::featured_local, &options, |e| {
|
||||
e.featured_local
|
||||
});
|
||||
} else {
|
||||
query =
|
||||
order_and_page_filter_desc(query, post_aggregates::featured_community, &options, |e| {
|
||||
e.featured_community
|
||||
});
|
||||
}
|
||||
if let Some(community_id) = options.community_id {
|
||||
query = query.filter(post_aggregates::community_id.eq(community_id));
|
||||
}
|
||||
|
||||
if let Some(creator_id) = options.creator_id {
|
||||
|
|
@ -292,12 +351,12 @@ fn queries<'a>() -> Queries<
|
|||
}
|
||||
}
|
||||
|
||||
if let Some(url_search) = options.url_search {
|
||||
if let Some(url_search) = &options.url_search {
|
||||
query = query.filter(post::url.eq(url_search));
|
||||
}
|
||||
|
||||
if let Some(search_term) = options.search_term {
|
||||
let searcher = fuzzy_search(&search_term);
|
||||
if let Some(search_term) = &options.search_term {
|
||||
let searcher = fuzzy_search(search_term);
|
||||
query = query.filter(
|
||||
post::name
|
||||
.ilike(searcher.clone())
|
||||
|
|
@ -373,70 +432,91 @@ fn queries<'a>() -> Queries<
|
|||
}
|
||||
let now = diesel::dsl::now.into_sql::<Timestamptz>();
|
||||
|
||||
query = match options.sort.unwrap_or(SortType::Hot) {
|
||||
SortType::Active => query
|
||||
.then_order_by(post_aggregates::hot_rank_active.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::Hot => query
|
||||
.then_order_by(post_aggregates::hot_rank.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::Scaled => query
|
||||
.then_order_by(post_aggregates::scaled_rank.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::Controversial => query.then_order_by(post_aggregates::controversy_rank.desc()),
|
||||
SortType::New => query.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::Old => query.then_order_by(post_aggregates::published.asc()),
|
||||
SortType::NewComments => query.then_order_by(post_aggregates::newest_comment_time.desc()),
|
||||
SortType::MostComments => query
|
||||
.then_order_by(post_aggregates::comments.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopAll => query
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopYear => query
|
||||
.filter(post_aggregates::published.gt(now - 1.years()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopMonth => query
|
||||
.filter(post_aggregates::published.gt(now - 1.months()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopWeek => query
|
||||
.filter(post_aggregates::published.gt(now - 1.weeks()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopDay => query
|
||||
.filter(post_aggregates::published.gt(now - 1.days()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopHour => query
|
||||
.filter(post_aggregates::published.gt(now - 1.hours()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopSixHour => query
|
||||
.filter(post_aggregates::published.gt(now - 6.hours()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopTwelveHour => query
|
||||
.filter(post_aggregates::published.gt(now - 12.hours()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopThreeMonths => query
|
||||
.filter(post_aggregates::published.gt(now - 3.months()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopSixMonths => query
|
||||
.filter(post_aggregates::published.gt(now - 6.months()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
SortType::TopNineMonths => query
|
||||
.filter(post_aggregates::published.gt(now - 9.months()))
|
||||
.then_order_by(post_aggregates::score.desc())
|
||||
.then_order_by(post_aggregates::published.desc()),
|
||||
{
|
||||
use post_aggregates::{
|
||||
comments,
|
||||
controversy_rank,
|
||||
hot_rank,
|
||||
hot_rank_active,
|
||||
published,
|
||||
scaled_rank,
|
||||
score,
|
||||
};
|
||||
match options.sort.as_ref().unwrap_or(&SortType::Hot) {
|
||||
SortType::Active => {
|
||||
query =
|
||||
order_and_page_filter_desc(query, hot_rank_active, &options, |e| e.hot_rank_active);
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published);
|
||||
}
|
||||
SortType::Hot => {
|
||||
query = order_and_page_filter_desc(query, hot_rank, &options, |e| e.hot_rank);
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published);
|
||||
}
|
||||
SortType::Scaled => {
|
||||
query = order_and_page_filter_desc(query, scaled_rank, &options, |e| e.scaled_rank);
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published);
|
||||
}
|
||||
SortType::Controversial => {
|
||||
query =
|
||||
order_and_page_filter_desc(query, controversy_rank, &options, |e| e.controversy_rank);
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published);
|
||||
}
|
||||
SortType::New => {
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published)
|
||||
}
|
||||
SortType::Old => {
|
||||
query = order_and_page_filter_asc(query, published, &options, |e| e.published)
|
||||
}
|
||||
SortType::NewComments => {
|
||||
query = order_and_page_filter_desc(query, newest_comment_time, &options, |e| {
|
||||
e.newest_comment_time
|
||||
})
|
||||
}
|
||||
SortType::MostComments => {
|
||||
query = order_and_page_filter_desc(query, comments, &options, |e| e.comments);
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published);
|
||||
}
|
||||
SortType::TopAll => {
|
||||
query = order_and_page_filter_desc(query, score, &options, |e| e.score);
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published);
|
||||
}
|
||||
o @ (SortType::TopYear
|
||||
| SortType::TopMonth
|
||||
| SortType::TopWeek
|
||||
| SortType::TopDay
|
||||
| SortType::TopHour
|
||||
| SortType::TopSixHour
|
||||
| SortType::TopTwelveHour
|
||||
| SortType::TopThreeMonths
|
||||
| SortType::TopSixMonths
|
||||
| SortType::TopNineMonths) => {
|
||||
let interval = match o {
|
||||
SortType::TopYear => 1.years(),
|
||||
SortType::TopMonth => 1.months(),
|
||||
SortType::TopWeek => 1.weeks(),
|
||||
SortType::TopDay => 1.days(),
|
||||
SortType::TopHour => 1.hours(),
|
||||
SortType::TopSixHour => 6.hours(),
|
||||
SortType::TopTwelveHour => 12.hours(),
|
||||
SortType::TopThreeMonths => 3.months(),
|
||||
SortType::TopSixMonths => 6.months(),
|
||||
SortType::TopNineMonths => 9.months(),
|
||||
_ => return Err(Error::NotFound),
|
||||
};
|
||||
query = query.filter(post_aggregates::published.gt(now - interval));
|
||||
query = order_and_page_filter_desc(query, score, &options, |e| e.score);
|
||||
query = order_and_page_filter_desc(query, published, &options, |e| e.published);
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
let (limit, offset) = limit_and_offset(options.page, options.limit)?;
|
||||
|
||||
let (limit, mut offset) = limit_and_offset(options.page, options.limit)?;
|
||||
if options.page_after.is_some() {
|
||||
// always skip exactly one post because that's the last post of the previous page
|
||||
// fixing the where clause is more difficult because we'd have to change only the last order-by-where clause
|
||||
// e.g. WHERE (featured_local<=, hot_rank<=, published<=) to WHERE (<=, <=, <)
|
||||
offset = 1;
|
||||
}
|
||||
query = query.limit(limit).offset(offset);
|
||||
|
||||
debug!("Post View Query: {:?}", debug_query::<Pg, _>(&query));
|
||||
|
|
@ -468,12 +548,42 @@ impl PostView {
|
|||
}
|
||||
}
|
||||
|
||||
#[derive(Default)]
|
||||
impl PaginationCursor {
|
||||
// get cursor for page that starts immediately after the given post
|
||||
pub fn after_post(view: &PostView) -> PaginationCursor {
|
||||
// hex encoding to prevent ossification
|
||||
PaginationCursor(format!("P{:x}", view.counts.post_id.0))
|
||||
}
|
||||
pub async fn read(&self, pool: &mut DbPool<'_>) -> Result<PaginationCursorData, Error> {
|
||||
Ok(PaginationCursorData(
|
||||
PostAggregates::read(
|
||||
pool,
|
||||
PostId(
|
||||
self
|
||||
.0
|
||||
.get(1..)
|
||||
.and_then(|e| i32::from_str_radix(e, 16).ok())
|
||||
.ok_or_else(|| Error::QueryBuilderError("Could not parse pagination token".into()))?,
|
||||
),
|
||||
)
|
||||
.await?,
|
||||
))
|
||||
}
|
||||
}
|
||||
|
||||
// currently we use a postaggregates struct as the pagination token.
|
||||
// we only use some of the properties of the post aggregates, depending on which sort type we page by
|
||||
#[derive(Clone)]
|
||||
pub struct PaginationCursorData(PostAggregates);
|
||||
|
||||
#[derive(Default, Clone)]
|
||||
pub struct PostQuery<'a> {
|
||||
pub listing_type: Option<ListingType>,
|
||||
pub sort: Option<SortType>,
|
||||
pub creator_id: Option<PersonId>,
|
||||
pub community_id: Option<CommunityId>,
|
||||
// if true, the query should be handled as if community_id was not given except adding the literal filter
|
||||
pub community_id_just_for_prefetch: bool,
|
||||
pub local_user: Option<&'a LocalUserView>,
|
||||
pub search_term: Option<String>,
|
||||
pub url_search: Option<String>,
|
||||
|
|
@ -484,13 +594,99 @@ pub struct PostQuery<'a> {
|
|||
pub is_profile_view: bool,
|
||||
pub page: Option<i64>,
|
||||
pub limit: Option<i64>,
|
||||
pub page_after: Option<PaginationCursorData>,
|
||||
pub page_before_or_equal: Option<PaginationCursorData>,
|
||||
}
|
||||
|
||||
impl<'a> PostQuery<'a> {
|
||||
async fn prefetch_upper_bound_for_page_before(
|
||||
&self,
|
||||
pool: &mut DbPool<'_>,
|
||||
) -> Result<Option<PostQuery<'a>>, Error> {
|
||||
// first get one page for the most popular community to get an upper bound for the the page end for the real query
|
||||
// the reason this is needed is that when fetching posts for a single community PostgreSQL can optimize
|
||||
// the query to use an index on e.g. (=, >=, >=, >=) and fetch only LIMIT rows
|
||||
// but for the followed-communities query it has to query the index on (IN, >=, >=, >=)
|
||||
// which it currently can't do at all (as of PG 16). see the discussion here:
|
||||
// https://github.com/LemmyNet/lemmy/issues/2877#issuecomment-1673597190
|
||||
//
|
||||
// the results are correct no matter which community we fetch these for, since it basically covers the "worst case" of the whole page consisting of posts from one community
|
||||
// but using the largest community decreases the pagination-frame so make the real query more efficient.
|
||||
use lemmy_db_schema::schema::{
|
||||
community_aggregates::dsl::{community_aggregates, community_id, users_active_month},
|
||||
community_follower::dsl::{
|
||||
community_follower,
|
||||
community_id as follower_community_id,
|
||||
person_id,
|
||||
},
|
||||
};
|
||||
let (limit, offset) = limit_and_offset(self.page, self.limit)?;
|
||||
if offset != 0 {
|
||||
return Err(Error::QueryBuilderError(
|
||||
"legacy pagination cannot be combined with v2 pagination".into(),
|
||||
));
|
||||
}
|
||||
let self_person_id = self
|
||||
.local_user
|
||||
.expect("part of the above if")
|
||||
.local_user
|
||||
.person_id;
|
||||
let largest_subscribed = {
|
||||
let conn = &mut get_conn(pool).await?;
|
||||
community_follower
|
||||
.filter(person_id.eq(self_person_id))
|
||||
.inner_join(community_aggregates.on(community_id.eq(follower_community_id)))
|
||||
.order_by(users_active_month.desc())
|
||||
.select(community_id)
|
||||
.limit(1)
|
||||
.get_result::<CommunityId>(conn)
|
||||
.await
|
||||
.optional()?
|
||||
};
|
||||
let Some(largest_subscribed) = largest_subscribed else {
|
||||
// nothing subscribed to? no posts
|
||||
return Ok(None);
|
||||
};
|
||||
|
||||
let mut v = queries()
|
||||
.list(
|
||||
pool,
|
||||
PostQuery {
|
||||
community_id: Some(largest_subscribed),
|
||||
community_id_just_for_prefetch: true,
|
||||
..self.clone()
|
||||
},
|
||||
)
|
||||
.await?;
|
||||
// take last element of array. if this query returned less than LIMIT elements,
|
||||
// the heuristic is invalid since we can't guarantee the full query will return >= LIMIT results (return original query)
|
||||
if (v.len() as i64) < limit {
|
||||
Ok(Some(self.clone()))
|
||||
} else {
|
||||
let page_before_or_equal = Some(PaginationCursorData(v.pop().expect("else case").counts));
|
||||
Ok(Some(PostQuery {
|
||||
page_before_or_equal,
|
||||
..self.clone()
|
||||
}))
|
||||
}
|
||||
}
|
||||
|
||||
pub async fn list(self, pool: &mut DbPool<'_>) -> Result<Vec<PostView>, Error> {
|
||||
if self.listing_type == Some(ListingType::Subscribed)
|
||||
&& self.community_id.is_none()
|
||||
&& self.local_user.is_some()
|
||||
&& self.page_before_or_equal.is_none()
|
||||
{
|
||||
if let Some(query) = self.prefetch_upper_bound_for_page_before(pool).await? {
|
||||
queries().list(pool, query).await
|
||||
} else {
|
||||
Ok(vec![])
|
||||
}
|
||||
} else {
|
||||
queries().list(pool, self).await
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod tests {
|
||||
|
|
|
|||
|
|
@ -89,6 +89,13 @@ pub struct PostReportView {
|
|||
pub resolver: Option<Person>,
|
||||
}
|
||||
|
||||
/// currently this is just a wrapper around post id, but should be seen as opaque from the client's perspective
|
||||
/// stringified since we might want to use arbitrary info later, with a P prepended to prevent ossification
|
||||
/// (api users love to make assumptions (e.g. parse stuff that looks like numbers as numbers) about apis that aren't part of the spec
|
||||
#[derive(Serialize, Deserialize, Debug, Clone)]
|
||||
#[cfg_attr(feature = "full", derive(ts_rs::TS))]
|
||||
pub struct PaginationCursor(pub(crate) String);
|
||||
|
||||
#[skip_serializing_none]
|
||||
#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
|
||||
#[cfg_attr(feature = "full", derive(TS, Queryable))]
|
||||
|
|
|
|||
54
migrations/2023-09-07-215546_post-queries-efficient/down.sql
Normal file
54
migrations/2023-09-07-215546_post-queries-efficient/down.sql
Normal file
|
|
@ -0,0 +1,54 @@
|
|||
DROP INDEX idx_post_aggregates_featured_community_active;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_controversy;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_hot;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_scaled;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_most_comments;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time_necro;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_published;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_score;
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_active ON post_aggregates (featured_community DESC, hot_rank_active DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_controversy ON post_aggregates (featured_community DESC, controversy_rank DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_hot ON post_aggregates (featured_community DESC, hot_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_scaled ON post_aggregates (featured_community DESC, scaled_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_most_comments ON post_aggregates (featured_community DESC, comments DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time ON post_aggregates (featured_community DESC, newest_comment_time DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time_necro ON post_aggregates (featured_community DESC, newest_comment_time_necro DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_published ON post_aggregates (featured_community DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_score ON post_aggregates (featured_community DESC, score DESC, published DESC);
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_active;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_controversy;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_hot;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_scaled;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_most_comments;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_newest_comment_time;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_newest_comment_time_necro;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_published;
|
||||
|
||||
DROP INDEX idx_post_aggregates_community_score;
|
||||
|
||||
59
migrations/2023-09-07-215546_post-queries-efficient/up.sql
Normal file
59
migrations/2023-09-07-215546_post-queries-efficient/up.sql
Normal file
|
|
@ -0,0 +1,59 @@
|
|||
-- these indices are used for single-community filtering and for the followed-communities (front-page) query
|
||||
-- basically one index per Sort
|
||||
-- index name is truncated to 63 chars so abbreviate a bit
|
||||
CREATE INDEX idx_post_aggregates_community_active ON post_aggregates (community_id, featured_local DESC, hot_rank_active DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_controversy ON post_aggregates (community_id, featured_local DESC, controversy_rank DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_hot ON post_aggregates (community_id, featured_local DESC, hot_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_scaled ON post_aggregates (community_id, featured_local DESC, scaled_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_most_comments ON post_aggregates (community_id, featured_local DESC, comments DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_newest_comment_time ON post_aggregates (community_id, featured_local DESC, newest_comment_time DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_newest_comment_time_necro ON post_aggregates (community_id, featured_local DESC, newest_comment_time_necro DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_published ON post_aggregates (community_id, featured_local DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_community_score ON post_aggregates (community_id, featured_local DESC, score DESC, published DESC);
|
||||
|
||||
-- these indices are used for "per-community" filtering
|
||||
-- these indices weren't really useful because whenever the query filters by featured_community it also filters by community_id, so prepend that to all these indexes
|
||||
DROP INDEX idx_post_aggregates_featured_community_active;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_controversy;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_hot;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_scaled;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_most_comments;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_newest_comment_time_necro;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_published;
|
||||
|
||||
DROP INDEX idx_post_aggregates_featured_community_score;
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_active ON post_aggregates (community_id, featured_community DESC, hot_rank_active DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_controversy ON post_aggregates (community_id, featured_community DESC, controversy_rank DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_hot ON post_aggregates (community_id, featured_community DESC, hot_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_scaled ON post_aggregates (community_id, featured_community DESC, scaled_rank DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_most_comments ON post_aggregates (community_id, featured_community DESC, comments DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time ON post_aggregates (community_id, featured_community DESC, newest_comment_time DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_newest_comment_time_necro ON post_aggregates (community_id, featured_community DESC, newest_comment_time_necro DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_published ON post_aggregates (community_id, featured_community DESC, published DESC);
|
||||
|
||||
CREATE INDEX idx_post_aggregates_featured_community_score ON post_aggregates (community_id, featured_community DESC, score DESC, published DESC);
|
||||
|
||||
Loading…
Reference in a new issue