stuff

Cargo.lock

@@ -2662,6 +2662,7 @@ name = "lemmy_db_schema"
 version = "0.19.0"
 dependencies = [
  "activitypub_federation",
+ "anyhow",
  "async-trait",
  "bcrypt",
  "chrono",

crates/db_perf/src/main.rs

@@ -1,6 +1,11 @@
-use clap::{Parser, Subcommand};
-use diesel::{dsl::{self, sql}, sql_query, sql_types, ExpressionMethods, IntoSql};
-use diesel_async::RunQueryDsl;
+use clap::Parser;
+use diesel::{
+  dsl::{self, sql},
+  sql_types,
+  ExpressionMethods,
+  IntoSql,
+};
+use diesel_async::{RunQueryDsl, SimpleAsyncConnection};
 use lemmy_db_schema::{
   schema::post,
   source::{
@@ -12,17 +17,14 @@ use lemmy_db_schema::{
   utils::{
     build_db_pool,
     get_conn,
-    series::{self, ValuesFromSeries}, DbConn, DbPool, now,
+    now,
+    series::{self, ValuesFromSeries},
   },
   SortType,
 };
-use lemmy_db_views::{
-  post_view::{PaginationCursorData, PostQuery},
-  structs::PaginationCursor,
-};
+use lemmy_db_views::{post_view::PostQuery, structs::PaginationCursor};
 use lemmy_utils::error::LemmyResult;
 use std::num::NonZeroU32;
-use diesel::pg::expression::dsl::IntervalDsl;
 
 #[derive(Parser, Debug)]
 struct CmdArgs {
@@ -40,52 +42,53 @@ struct CmdArgs {
 
 #[tokio::main]
 async fn main() -> LemmyResult<()> {
+  if let Err(err) = try_main().await {
+    println!("Error: {err:?}");
+  }
+  if let Ok(path) = std::env::var("PGDATA") {
+    println!("🪵 query plans and error details written in {path}/log");
+  }
+
+  Ok(())
+}
+
+async fn try_main() -> LemmyResult<()> {
   let args = CmdArgs::parse();
   let pool = &build_db_pool().await?;
   let pool = &mut pool.into();
-
   let conn = &mut get_conn(pool).await?;
+
   if args.explain_insertions {
-    sql_query("SET auto_explain.log_min_duration = 0")
-      .execute(conn)
+    // log_nested_statements is enabled to log trigger execution
+    conn
+      .batch_execute(
+        "SET auto_explain.log_min_duration = 0; SET auto_explain.log_nested_statements = on;",
+      )
       .await?;
   }
-  let pool = &mut conn.into();
 
-  let instance = Instance::read_or_create(pool, "reddit.com".to_owned()).await?;
+  let instance = Instance::read_or_create(&mut conn.into(), "reddit.com".to_owned()).await?;
 
   println!("🫃 creating {} people", args.people);
   let mut person_ids = vec![];
   for i in 0..args.people.get() {
-    person_ids.push(
-      Person::create(
-        pool,
-        &PersonInsertForm::builder()
-          .name(format!("p{i}"))
-          .public_key("pubkey".to_owned())
-          .instance_id(instance.id)
-          .build(),
-      )
-      .await?
-      .id,
-    );
+    let form = PersonInsertForm::builder()
+      .name(format!("p{i}"))
+      .public_key("pubkey".to_owned())
+      .instance_id(instance.id)
+      .build();
+    person_ids.push(Person::create(&mut conn.into(), &form).await?.id);
   }
 
   println!("🏠 creating {} communities", args.communities);
   let mut community_ids = vec![];
   for i in 0..args.communities.get() {
-    community_ids.push(
-      Community::create(
-        pool,
-        &CommunityInsertForm::builder()
-          .name(format!("c{i}"))
-          .title(i.to_string())
-          .instance_id(instance.id)
-          .build(),
-      )
-      .await?
-      .id,
-    );
+    let form = CommunityInsertForm::builder()
+      .name(format!("c{i}"))
+      .title(i.to_string())
+      .instance_id(instance.id)
+      .build();
+    community_ids.push(Community::create(&mut conn.into(), &form).await?.id);
   }
 
   let post_batches = args.people.get() * args.communities.get();
@@ -108,7 +111,10 @@ async fn main() -> LemmyResult<()> {
             person_id.into_sql::<sql_types::Integer>(),
             community_id.into_sql::<sql_types::Integer>(),
             series::current_value.eq(1),
-            now() - sql::<sql_types::Interval>("make_interval(secs => ").bind::<sql_types::BigInt, _>(series::current_value).sql(")"),
+            now()
+              - sql::<sql_types::Interval>("make_interval(secs => ")
+                .bind::<sql_types::BigInt, _>(series::current_value)
+                .sql(")"),
           ),
         })
         .into_columns((
@@ -118,64 +124,50 @@ async fn main() -> LemmyResult<()> {
           post::featured_community,
           post::published,
         ))
-        .execute(&mut get_conn(pool).await?)
+        .execute(conn)
         .await?;
       num_inserted_posts += n;
     }
   }
-
-  // Lie detector for the println above
+  // Make sure the println above shows the correct amount
   assert_eq!(num_inserted_posts, num_posts as usize);
 
   // Enable auto_explain
-  let conn = &mut get_conn(pool).await?;
-  sql_query("SET auto_explain.log_min_duration = 0")
-    .execute(conn)
+  conn
+    .batch_execute(
+      "SET auto_explain.log_min_duration = 0; SET auto_explain.log_nested_statements = off;",
+    )
+    .await?;
+
+  let mut page_after = None;
+  for page_num in 1..=args.read_post_pages {
+    println!(
+      "👀 getting page {page_num} of posts (pagination cursor used: {})",
+      page_after.is_some()
+    );
+
+    // TODO: include local_user
+    let post_views = PostQuery {
+      community_id: community_ids.get(0).cloned(),
+      sort: Some(SortType::New),
+      limit: Some(20),
+      page_after,
+      ..Default::default()
+    }
+    .list(&mut conn.into())
     .await?;
-  let pool = &mut conn.into();
 
-  {
-    let mut page_after = None;
-    for page_num in 1..=args.read_post_pages {
-      println!(
-        "👀 getting page {page_num} of posts (pagination cursor used: {})",
-        page_after.is_some()
-      );
-      // TODO: include local_user
-      let post_views = PostQuery {
-        community_id: community_ids.get(0).cloned(),
-        sort: Some(SortType::New),
-        limit: Some(20),
-        page_after,
-        ..Default::default()
-      }
-      .list(pool)
-      .await?;
     if let Some(post_view) = post_views.into_iter().last() {
       println!("👀 getting pagination cursor data for next page");
-      let cursor_data = PaginationCursor::after_post(&post_view).read(pool).await?;
+      let cursor_data = PaginationCursor::after_post(&post_view)
+        .read(&mut conn.into())
+        .await?;
       page_after = Some(cursor_data);
     } else {
-      println!("🚫 reached empty page");
+      println!("👀 reached empty page");
       break;
     }
-    }
-  }
-  
-  // TODO show this path when there's an error
-  if let Ok(path) = std::env::var("PGDATA") {
-    println!("🪵 query plans written in {path}/log");
   }
 
   Ok(())
 }
-
-async fn conn_with_auto_explain<'a, 'b: 'a>(pool: &'a mut DbPool<'b>) -> LemmyResult<DbConn<'a>> {
-  let mut conn = get_conn(pool).await?;
-
-  sql_query("SET auto_explain.log_min_duration = 0")
-    .execute(&mut conn)
-    .await?;
-
-  Ok(conn)
-}

crates/db_schema/Cargo.toml

@@ -76,6 +76,7 @@ tokio-postgres = { workspace = true, optional = true }
 tokio-postgres-rustls = { workspace = true, optional = true }
 rustls = { workspace = true, optional = true }
 uuid = { workspace = true, features = ["v4"] }
+anyhow = { workspace = true }
 
 [dev-dependencies]
 serial_test = { workspace = true }

crates/db_schema/src/impls/post.rs

@@ -41,14 +41,7 @@ use crate::{
 };
 use ::url::Url;
 use chrono::{Duration, Utc};
-use diesel::{
-  dsl::insert_into,
-  result::Error,
-  ExpressionMethods,
-  Insertable,
-  QueryDsl,
-  TextExpressionMethods,
-};
+use diesel::{dsl::insert_into, result::Error, ExpressionMethods, QueryDsl, TextExpressionMethods};
 use diesel_async::RunQueryDsl;
 use std::collections::HashSet;
 

crates/db_schema/src/utils.rs

@@ -8,6 +8,7 @@ use crate::{
   SortType,
 };
 use activitypub_federation::{fetch::object_id::ObjectId, traits::Object};
+use anyhow::Context;
 use chrono::{DateTime, Utc};
 use deadpool::Runtime;
 use diesel::{
@@ -19,11 +20,9 @@ use diesel::{
   query_dsl::methods::LimitDsl,
   result::{ConnectionError, ConnectionResult, Error as DieselError, Error::QueryBuilderError},
   serialize::{Output, ToSql},
-  sql_query,
   sql_types::{Text, Timestamptz},
   IntoSql,
   PgConnection,
-  RunQueryDsl,
 };
 use diesel_async::{
   pg::AsyncPgConnection,
@@ -343,21 +342,18 @@ impl ServerCertVerifier for NoCertVerifier {
 
 pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!();
 
-fn run_migrations(db_url: &str) {
+fn run_migrations(db_url: &str) -> Result<(), LemmyError> {
   // Needs to be a sync connection
   let mut conn =
-    PgConnection::establish(db_url).unwrap_or_else(|e| panic!("Error connecting to {db_url}: {e}"));
-
-  // Disable auto_explain output for migrations
-  sql_query("SET auto_explain.log_min_duration = -1")
-    .execute(&mut conn)
-    .expect("failed to disable auto_explain");
+    PgConnection::establish(db_url).with_context(|| format!("Error connecting to {db_url}"))?;
 
   info!("Running Database migrations (This may take a long time)...");
-  let _ = &mut conn
+  conn
     .run_pending_migrations(MIGRATIONS)
-    .unwrap_or_else(|e| panic!("Couldn't run DB Migrations: {e}"));
+    .map_err(|e| anyhow::Error::msg(format!("Couldn't run DB Migrations: {e}")))?;
   info!("Database migrations complete.");
+
+  Ok(())
 }
 
 pub async fn build_db_pool() -> Result<ActualDbPool, LemmyError> {
@@ -381,7 +377,7 @@ pub async fn build_db_pool() -> Result<ActualDbPool, LemmyError> {
     .runtime(Runtime::Tokio1)
     .build()?;
 
-  run_migrations(&db_url);
+  run_migrations(&db_url)?;
 
   Ok(pool)
 }

scripts/start_dev_db.sh

@@ -30,9 +30,6 @@ config_args=(
   # Allow auto_explain to be turned on
   -c session_preload_libraries=auto_explain
 
-  # Log triggers
-  -c auto_explain.log_nested_statements=on
-
   # Include actual row amounts and run times for query plan nodes
   -c auto_explain.log_analyze=on
 
@@ -43,7 +40,7 @@ config_args=(
 # Create cluster
 pg_ctl init --silent --options="--username=postgres --auth=trust --no-instructions"
 
-# Start server that only listens to socket in current directory
+# Start server
 pg_ctl start --silent --options="${config_args[*]}"
 
 # Setup database