feat: cache for posts list

src/api/comment.rs

@@ -92,7 +92,7 @@ pub async fn add_comment(
     rconn: RdsConn,
 ) -> API<Value> {
     let mut p = Post::get(&db, &rconn, ci.pid).await?;
-    Comment::create(
+    let c = Comment::create(
         &db,
         NewComment {
             content: ci.text.to_string(),
@@ -104,6 +104,7 @@ pub async fn add_comment(
     )
     .await?;
     p.change_n_comments(&db, 1).await?;
+    p.update_comment_time(&db, c.create_time).await?;
     // auto attention after comment
     let mut att = Attention::init(&user.namehash, &rconn);
 

src/api/operation.rs

@@ -38,7 +38,8 @@ pub async fn delete(
         _ => return Err(APIError::PcError(NotAllowed)),
     }
 
-    p.refresh_cache(&rconn, false).await;
+    // 如果是删除，需要也从0号缓存队列中去掉
+    p.refresh_cache(&rconn, true).await;
 
     Ok(json!({
         "code": 0

src/api/post.rs

@@ -67,7 +67,10 @@ async fn p2output(p: &Post, user: &CurrentUser, db: &Db, rconn: &RdsConn) -> Pos
             None
         } else {
             // 单个洞还有查询评论的接口，这里挂了不用报错
-            p.get_comments(db, rconn).await.ok().map(|cs| c2output(p, &cs, user))
+            p.get_comments(db, rconn)
+                .await
+                .ok()
+                .map(|cs| c2output(p, &cs, user))
         },
         can_del: p.check_permission(user, "wd").is_ok(),
         attention: Attention::init(&user.namehash, &rconn)
@@ -117,7 +120,7 @@ pub async fn get_list(
     let page = p.unwrap_or(1);
     let page_size = 25;
     let start = (page - 1) * page_size;
-    let ps = Post::gets_by_page(&db, order_mode, start.into(), page_size.into()).await?;
+    let ps = Post::gets_by_page(&db, &rconn, order_mode, start.into(), page_size.into()).await?;
     let ps_data = ps2outputs(&ps, &user, &db, &rconn).await;
     Ok(json!({
         "data": ps_data,
@@ -147,6 +150,7 @@ pub async fn publish_post(
     )
     .await?;
     Attention::init(&user.namehash, &rconn).add(p.id).await?;
+    p.refresh_cache(&rconn, true).await;
     Ok(json!({
         "code": 0
     }))

src/api/search.rs

@@ -26,6 +26,7 @@ pub async fn search(
     } else {
         Post::search(
             &db,
+            &rconn,
             search_mode,
             keywords.to_string(),
             start.into(),

src/api/systemlog.rs

@@ -1,8 +1,8 @@
 use crate::api::{CurrentUser, API};
+use crate::db_conn::Db;
 use crate::random_hasher::RandomHasher;
 use rocket::serde::json::{json, Value};
 use rocket::State;
-use crate::db_conn::Db;
 
 #[get("/systemlog")]
 pub async fn get_systemlog(user: CurrentUser, rh: &State<RandomHasher>, db: Db) -> API<Value> {

src/cache.rs

@@ -1,10 +1,15 @@
 use crate::models::{Comment, Post, User};
 use crate::rds_conn::RdsConn;
+use rand::Rng;
 use redis::AsyncCommands;
 use rocket::serde::json::serde_json;
 // can use rocket::serde::json::to_string in master version
 
 const INSTANCE_EXPIRE_TIME: usize = 60 * 60;
+
+const MIN_LENGTH: isize = 200;
+const MAX_LENGTH: isize = 900;
+
 macro_rules! post_cache_key {
     ($id: expr) => {
         format!("hole_v2:cache:post:{}", $id)
@@ -150,6 +155,109 @@ impl PostCommentCache {
     }
 }
 
+pub struct PostListCommentCache {
+    key: String,
+    mode: u8,
+    rconn: RdsConn,
+    length: isize,
+}
+
+impl PostListCommentCache {
+    pub async fn init(mode: u8, rconn: &RdsConn) -> Self {
+        let mut cacher = PostListCommentCache {
+            key: format!("hole_v2:cache:post_list:{}", &mode),
+            mode: mode,
+            rconn: rconn.clone(),
+            length: 0,
+        };
+        cacher.set_and_check_length().await;
+        cacher
+    }
+
+    async fn set_and_check_length(&mut self) {
+        let mut l = self.rconn.zcard(&self.key).await.unwrap();
+        if l > MAX_LENGTH {
+            self.rconn
+                .zremrangebyrank::<&String, ()>(&self.key, MIN_LENGTH, -1)
+                .await
+                .unwrap_or_else(|e| {
+                    warn!("cut list cache failed, {}, {}", e, &self.key);
+                });
+            l = MIN_LENGTH;
+        }
+        self.length = l;
+    }
+
+    pub fn need_fill(&self) -> bool {
+        self.length < MIN_LENGTH
+    }
+
+    pub fn i64_len(&self) -> i64 {
+        self.length.try_into().unwrap()
+    }
+
+    pub fn i64_minlen(&self) -> i64 {
+        MIN_LENGTH.try_into().unwrap()
+    }
+
+    fn p2pair(&self, p: &Post) -> (i64, i32) {
+        (
+            match self.mode {
+                0 => (-p.id).into(),
+                1 => -p.last_comment_time.timestamp(),
+                2 => (-p.hot_score).into(),
+                3 => rand::thread_rng().gen_range(0..i64::MAX),
+                _ => panic!("wrong mode"),
+            },
+            p.id,
+        )
+    }
+
+    pub async fn fill(&mut self, ps: &Vec<Post>) {
+        let items: Vec<(i64, i32)> = ps.iter().map(|p| self.p2pair(p)).collect();
+        self.rconn
+            .zadd_multiple(&self.key, &items)
+            .await
+            .unwrap_or_else(|e| {
+                warn!("fill list cache failed, {} {}", e, &self.key);
+            });
+
+        self.set_and_check_length().await;
+    }
+
+    pub async fn put(&mut self, p: &Post) {
+        // 其他都是加到最前面的，但热榜不是。可能导致MIN_LENGTH到MAX_LENGTH之间的数据不可靠
+        // 影响不大，先不管了
+        if p.is_deleted {
+            self.rconn.zrem(&self.key, p.id).await.unwrap_or_else(|e| {
+                warn!(
+                    "remove from list cache failed, {} {} {}",
+                    e, &self.key, p.id
+                );
+            });
+        } else {
+            let (s, m) = self.p2pair(p);
+            self.rconn.zadd(&self.key, m, s).await.unwrap_or_else(|e| {
+                warn!(
+                    "put into list cache failed, {} {} {} {}",
+                    e, &self.key, m, s
+                );
+            });
+        }
+    }
+
+    pub async fn get_pids(&mut self, start: i64, limit: i64) -> Vec<i32> {
+        self.rconn
+            .zrange(
+                &self.key,
+                start.try_into().unwrap(),
+                (start + limit - 1).try_into().unwrap(),
+            )
+            .await
+            .unwrap()
+    }
+}
+
 pub struct UserCache {
     key: String,
     rconn: RdsConn,

src/models.rs

@@ -1,6 +1,6 @@
 #![allow(clippy::all)]
 
-use crate::cache::{PostCache, PostCommentCache, UserCache};
+use crate::cache::*;
 use crate::db_conn::Db;
 use crate::libs::diesel_logger::LoggingConnection;
 use crate::rds_conn::RdsConn;
@@ -11,6 +11,7 @@ use diesel::{
     insert_into, BoolExpressionMethods, ExpressionMethods, QueryDsl, QueryResult, RunQueryDsl,
     TextExpressionMethods,
 };
+use rocket::futures::{future, join};
 use rocket::serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::convert::identity;
@@ -191,11 +192,7 @@ impl Post {
         }
     }
 
-    pub async fn get_comments(
+    pub async fn get_comments(&self, db: &Db, rconn: &RdsConn) -> QueryResult<Vec<Comment>> {
-        &self,
-        db: &Db,
-        rconn: &RdsConn,
-    ) -> QueryResult<Vec<Comment>> {
         let mut cacher = PostCommentCache::init(self.id, rconn);
         if let Some(cs) = cacher.get().await {
             Ok(cs)
@@ -212,12 +209,34 @@ impl Post {
 
     pub async fn gets_by_page(
         db: &Db,
+        rconn: &RdsConn,
         order_mode: u8,
         start: i64,
         limit: i64,
     ) -> QueryResult<Vec<Self>> {
+        let mut cacher = PostListCommentCache::init(order_mode, &rconn).await;
+        if cacher.need_fill() {
+            let pids =
+                Self::_get_ids_by_page(db, order_mode.clone(), 0, cacher.i64_minlen()).await?;
+            let ps = Self::get_multi(db, rconn, &pids).await?;
+            cacher.fill(&ps).await;
+        }
+        let pids = if start + limit > cacher.i64_len() {
+            Self::_get_ids_by_page(db, order_mode, start, limit).await?
+        } else {
+            cacher.get_pids(start, limit).await
+        };
+
+        Self::get_multi(db, rconn, &pids).await
+    }
+    async fn _get_ids_by_page(
+        db: &Db,
+        order_mode: u8,
+        start: i64,
+        limit: i64,
+    ) -> QueryResult<Vec<i32>> {
         db.run(move |c| {
-            let mut query = base_query!(posts);
+            let mut query = base_query!(posts).select(posts::id);
             if order_mode > 0 {
                 query = query.filter(posts::is_reported.eq(false))
             }
@@ -237,15 +256,20 @@ impl Post {
 
     pub async fn search(
         db: &Db,
+        rconn: &RdsConn,
         search_mode: u8,
         search_text: String,
         start: i64,
         limit: i64,
     ) -> QueryResult<Vec<Self>> {
         let search_text2 = search_text.replace("%", "\\%");
-        db.run(move |c| {
+        let pids = db
+            .run(move |c| {
                 let pat;
-            let mut query = base_query!(posts).distinct().left_join(comments::table);
+                let mut query = base_query!(posts)
+                    .select(posts::id)
+                    .distinct()
+                    .left_join(comments::table);
                 // 先用搜索+缓存，性能有问题了再真的做tag表
                 query = match search_mode {
                     0 => {
@@ -278,7 +302,8 @@ impl Post {
                     .limit(limit)
                     .load(with_log!(c))
             })
-        .await
+            .await?;
+        Self::get_multi(db, rconn, &pids).await
     }
 
     pub async fn create(db: &Db, new_post: NewPost) -> QueryResult<Self> {
@@ -303,6 +328,18 @@ impl Post {
         Ok(())
     }
 
+    pub async fn update_comment_time(&mut self, db: &Db, t: DateTime<Utc>) -> QueryResult<()> {
+        let pid = self.id;
+        *self = db
+            .run(move |c| {
+                diesel::update(posts::table.find(pid))
+                    .set(posts::last_comment_time.eq(t))
+                    .get_result(with_log!(c))
+            })
+            .await?;
+        Ok(())
+    }
+
     pub async fn change_n_comments(&mut self, db: &Db, delta: i32) -> QueryResult<()> {
         let pid = self.id;
         *self = db
@@ -343,7 +380,15 @@ impl Post {
         PostCache::init(rconn).sets(&vec![self]).await;
     }
     pub async fn refresh_cache(&self, rconn: &RdsConn, is_new: bool) {
-        self.set_instance_cache(rconn).await;
+        join!(
+            self.set_instance_cache(rconn),
+            future::join_all((if is_new { 0..4 } else { 1..4 }).map(|mode| async move {
+                PostListCommentCache::init(mode, &rconn.clone())
+                    .await
+                    .put(self)
+                    .await
+            })),
+        );
     }
 }