use crate::{ diesel::Connection, diesel_migrations::MigrationHarness, newtypes::DbUrl, CommentSortType, SortType, }; use anyhow::Context; use chrono::{DateTime, Utc}; use deadpool::Runtime; use diesel::{ helper_types::AsExprOf, pg::Pg, query_builder::{Query, QueryFragment}, query_dsl::methods::LimitDsl, result::{ConnectionError, ConnectionResult, Error as DieselError, Error::QueryBuilderError}, sql_types::{self, Timestamptz}, IntoSql, PgConnection, }; use diesel_async::{ pg::AsyncPgConnection, pooled_connection::{ deadpool::{Hook, HookError, Object as PooledConnection, Pool}, AsyncDieselConnectionManager, ManagerConfig, }, SimpleAsyncConnection, }; use diesel_migrations::EmbeddedMigrations; use futures_util::{future::BoxFuture, Future, FutureExt}; use i_love_jesus::CursorKey; use lemmy_utils::{ error::{LemmyError, LemmyErrorExt, LemmyErrorType}, settings::SETTINGS, }; use once_cell::sync::Lazy; use regex::Regex; use rustls::{ client::{ServerCertVerified, ServerCertVerifier}, ServerName, }; use std::{ ops::{Deref, DerefMut}, sync::Arc, time::{Duration, SystemTime}, }; use tracing::{error, info}; use url::Url; const FETCH_LIMIT_DEFAULT: i64 = 10; pub const FETCH_LIMIT_MAX: i64 = 50; pub const SITEMAP_LIMIT: i64 = 50000; pub const SITEMAP_DAYS: i64 = 31; pub const RANK_DEFAULT: f64 = 0.0001; pub type ActualDbPool = Pool; /// References a pool or connection. Functions must take `&mut DbPool<'_>` to allow implicit reborrowing. /// /// https://github.com/rust-lang/rfcs/issues/1403 pub enum DbPool<'a> { Pool(&'a ActualDbPool), Conn(&'a mut AsyncPgConnection), } pub enum DbConn<'a> { Pool(PooledConnection), Conn(&'a mut AsyncPgConnection), } pub async fn get_conn<'a, 'b: 'a>(pool: &'a mut DbPool<'b>) -> Result, DieselError> { Ok(match pool { DbPool::Pool(pool) => DbConn::Pool(pool.get().await.map_err(|e| QueryBuilderError(e.into()))?), DbPool::Conn(conn) => DbConn::Conn(conn), }) } impl<'a> Deref for DbConn<'a> { type Target = AsyncPgConnection; fn deref(&self) -> &Self::Target { match self { DbConn::Pool(conn) => conn.deref(), DbConn::Conn(conn) => conn.deref(), } } } impl<'a> DerefMut for DbConn<'a> { fn deref_mut(&mut self) -> &mut Self::Target { match self { DbConn::Pool(conn) => conn.deref_mut(), DbConn::Conn(conn) => conn.deref_mut(), } } } // Allows functions that take `DbPool<'_>` to be called in a transaction by passing `&mut conn.into()` impl<'a> From<&'a mut AsyncPgConnection> for DbPool<'a> { fn from(value: &'a mut AsyncPgConnection) -> Self { DbPool::Conn(value) } } impl<'a, 'b: 'a> From<&'a mut DbConn<'b>> for DbPool<'a> { fn from(value: &'a mut DbConn<'b>) -> Self { DbPool::Conn(value.deref_mut()) } } impl<'a> From<&'a ActualDbPool> for DbPool<'a> { fn from(value: &'a ActualDbPool) -> Self { DbPool::Pool(value) } } /// Runs multiple async functions that take `&mut DbPool<'_>` as input and return `Result`. Only works when the `futures` crate is listed in `Cargo.toml`. /// /// `$pool` is the value given to each function. /// /// A `Result` is returned (not in a `Future`, so don't use `.await`). The `Ok` variant contains a tuple with the values returned by the given functions. /// /// The functions run concurrently if `$pool` has the `DbPool::Pool` variant. #[macro_export] macro_rules! try_join_with_pool { ($pool:ident => ($($func:expr),+)) => {{ // Check type let _: &mut $crate::utils::DbPool<'_> = $pool; match $pool { // Run concurrently with `try_join` $crate::utils::DbPool::Pool(__pool) => ::futures::try_join!( $(async { let mut __dbpool = $crate::utils::DbPool::Pool(__pool); ($func)(&mut __dbpool).await }),+ ), // Run sequentially $crate::utils::DbPool::Conn(__conn) => async { Ok(($({ let mut __dbpool = $crate::utils::DbPool::Conn(__conn); // `?` prevents the error type from being inferred in an `async` block, so `match` is used instead match ($func)(&mut __dbpool).await { ::core::result::Result::Ok(__v) => __v, ::core::result::Result::Err(__v) => return ::core::result::Result::Err(__v), } }),+)) }.await, } }}; } pub struct ReverseTimestampKey(pub K); impl CursorKey for ReverseTimestampKey where K: CursorKey, { type SqlType = sql_types::BigInt; type CursorValue = functions::reverse_timestamp_sort::HelperType; type SqlValue = functions::reverse_timestamp_sort::HelperType; fn get_cursor_value(cursor: &C) -> Self::CursorValue { functions::reverse_timestamp_sort(K::get_cursor_value(cursor)) } fn get_sql_value() -> Self::SqlValue { functions::reverse_timestamp_sort(K::get_sql_value()) } } /// Includes an SQL comment before `T`, which can be used to label auto_explain output #[derive(QueryId)] pub struct Commented { comment: String, inner: T, } impl Commented { pub fn new(inner: T) -> Self { Commented { comment: String::new(), inner, } } /// Adds `text` to the comment if `condition` is true pub fn text_if(mut self, text: &str, condition: bool) -> Self { if condition { if !self.comment.is_empty() { self.comment.push_str(", "); } self.comment.push_str(text); } self } /// Adds `text` to the comment pub fn text(self, text: &str) -> Self { self.text_if(text, true) } } impl Query for Commented { type SqlType = T::SqlType; } impl> QueryFragment for Commented { fn walk_ast<'b>( &'b self, mut out: diesel::query_builder::AstPass<'_, 'b, Pg>, ) -> Result<(), DieselError> { for line in self.comment.lines() { out.push_sql("\n-- "); out.push_sql(line); } out.push_sql("\n"); self.inner.walk_ast(out.reborrow()) } } impl LimitDsl for Commented { type Output = Commented; fn limit(self, limit: i64) -> Self::Output { Commented { comment: self.comment, inner: self.inner.limit(limit), } } } pub fn fuzzy_search(q: &str) -> String { let replaced = q .replace('\\', "\\\\") .replace('%', "\\%") .replace('_', "\\_") .replace(' ', "%"); format!("%{replaced}%") } pub fn limit_and_offset( page: Option, limit: Option, ) -> Result<(i64, i64), diesel::result::Error> { let page = match page { Some(page) => { if page < 1 { return Err(QueryBuilderError("Page is < 1".into())); } else { page } } None => 1, }; let limit = match limit { Some(limit) => { if !(1..=FETCH_LIMIT_MAX).contains(&limit) { return Err(QueryBuilderError( format!("Fetch limit is > {FETCH_LIMIT_MAX}").into(), )); } else { limit } } None => FETCH_LIMIT_DEFAULT, }; let offset = limit * (page - 1); Ok((limit, offset)) } pub fn limit_and_offset_unlimited(page: Option, limit: Option) -> (i64, i64) { let limit = limit.unwrap_or(FETCH_LIMIT_DEFAULT); let offset = limit * (page.unwrap_or(1) - 1); (limit, offset) } pub fn is_email_regex(test: &str) -> bool { EMAIL_REGEX.is_match(test) } pub fn diesel_option_overwrite(opt: Option) -> Option> { match opt { // An empty string is an erase Some(unwrapped) => { if !unwrapped.eq("") { Some(Some(unwrapped)) } else { Some(None) } } None => None, } } pub fn diesel_option_overwrite_to_url( opt: &Option, ) -> Result>, LemmyError> { match opt.as_ref().map(String::as_str) { // An empty string is an erase Some("") => Ok(Some(None)), Some(str_url) => Url::parse(str_url) .map(|u| Some(Some(u.into()))) .with_lemmy_type(LemmyErrorType::InvalidUrl), None => Ok(None), } } pub fn diesel_option_overwrite_to_url_create( opt: &Option, ) -> Result, LemmyError> { match opt.as_ref().map(String::as_str) { // An empty string is nothing Some("") => Ok(None), Some(str_url) => Url::parse(str_url) .map(|u| Some(u.into())) .with_lemmy_type(LemmyErrorType::InvalidUrl), None => Ok(None), } } fn establish_connection(config: &str) -> BoxFuture> { let fut = async { let rustls_config = rustls::ClientConfig::builder() .with_safe_defaults() .with_custom_certificate_verifier(Arc::new(NoCertVerifier {})) .with_no_client_auth(); let tls = tokio_postgres_rustls::MakeRustlsConnect::new(rustls_config); let (client, conn) = tokio_postgres::connect(config, tls) .await .map_err(|e| ConnectionError::BadConnection(e.to_string()))?; tokio::spawn(async move { if let Err(e) = conn.await { error!("Database connection failed: {e}"); } }); let mut conn = AsyncPgConnection::try_from(client).await?; // * Change geqo_threshold back to default value if it was changed, so it's higher than the collapse limits // * Change collapse limits from 8 to 11 so the query planner can find a better table join order for more complicated queries conn .batch_execute("SET geqo_threshold=12;SET from_collapse_limit=11;SET join_collapse_limit=11;") .await .map_err(ConnectionError::CouldntSetupConfiguration)?; Ok(conn) }; fut.boxed() } struct NoCertVerifier {} impl ServerCertVerifier for NoCertVerifier { fn verify_server_cert( &self, _end_entity: &rustls::Certificate, _intermediates: &[rustls::Certificate], _server_name: &ServerName, _scts: &mut dyn Iterator, _ocsp_response: &[u8], _now: SystemTime, ) -> Result { // Will verify all (even invalid) certs without any checks (sslmode=require) Ok(ServerCertVerified::assertion()) } } pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!(); fn run_migrations(db_url: &str) -> Result<(), LemmyError> { // Needs to be a sync connection let mut conn = PgConnection::establish(db_url).with_context(|| "Error connecting to database")?; info!("Running Database migrations (This may take a long time)..."); conn .run_pending_migrations(MIGRATIONS) .map_err(|e| anyhow::anyhow!("Couldn't run DB Migrations: {e}"))?; info!("Database migrations complete."); Ok(()) } pub async fn build_db_pool() -> Result { let db_url = SETTINGS.get_database_url(); // We only support TLS with sslmode=require currently let tls_enabled = db_url.contains("sslmode=require"); let manager = if tls_enabled { // diesel-async does not support any TLS connections out of the box, so we need to manually // provide a setup function which handles creating the connection let mut config = ManagerConfig::default(); config.custom_setup = Box::new(establish_connection); AsyncDieselConnectionManager::::new_with_config(&db_url, config) } else { AsyncDieselConnectionManager::::new(&db_url) }; let pool = Pool::builder(manager) .max_size(SETTINGS.database.pool_size) .runtime(Runtime::Tokio1) // Limit connection age to prevent use of prepared statements that have query plans based on very old statistics .pre_recycle(Hook::sync_fn(|_conn, metrics| { // Preventing the first recycle can cause an infinite loop when trying to get a new connection from the pool let conn_was_used = metrics.recycled.is_some(); if metrics.age() > Duration::from_secs(3 * 24 * 60 * 60) && conn_was_used { Err(HookError::Continue(None)) } else { Ok(()) } })) .build()?; run_migrations(&db_url)?; Ok(pool) } pub async fn build_db_pool_for_tests() -> ActualDbPool { build_db_pool().await.expect("db pool missing") } pub fn naive_now() -> DateTime { Utc::now() } pub fn post_to_comment_sort_type(sort: SortType) -> CommentSortType { match sort { SortType::Active | SortType::Hot | SortType::Scaled => CommentSortType::Hot, SortType::New | SortType::NewComments | SortType::MostComments => CommentSortType::New, SortType::Old => CommentSortType::Old, SortType::Controversial => CommentSortType::Controversial, SortType::TopHour | SortType::TopSixHour | SortType::TopTwelveHour | SortType::TopDay | SortType::TopAll | SortType::TopWeek | SortType::TopYear | SortType::TopMonth | SortType::TopThreeMonths | SortType::TopSixMonths | SortType::TopNineMonths => CommentSortType::Top, } } static EMAIL_REGEX: Lazy = Lazy::new(|| { Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$") .expect("compile email regex") }); pub mod functions { use diesel::sql_types::{BigInt, Text, Timestamptz}; sql_function! { fn hot_rank(score: BigInt, time: Timestamptz) -> Double; } sql_function! { fn scaled_rank(score: BigInt, time: Timestamptz, users_active_month: BigInt) -> Double; } sql_function! { fn controversy_rank(upvotes: BigInt, downvotes: BigInt, score: BigInt) -> Double; } sql_function!(fn reverse_timestamp_sort(time: Timestamptz) -> BigInt); sql_function!(fn lower(x: Text) -> Text); // really this function is variadic, this just adds the two-argument version sql_function!(fn coalesce(x: diesel::sql_types::Nullable, y: T) -> T); } pub const DELETED_REPLACEMENT_TEXT: &str = "*Permanently Deleted*"; pub fn now() -> AsExprOf { // https://github.com/diesel-rs/diesel/issues/1514 diesel::dsl::now.into_sql::() } pub type ResultFuture<'a, T> = BoxFuture<'a, Result>; pub trait ReadFn<'a, T, Args>: Fn(DbConn<'a>, Args) -> ResultFuture<'a, T> {} impl<'a, T, Args, F: Fn(DbConn<'a>, Args) -> ResultFuture<'a, T>> ReadFn<'a, T, Args> for F {} pub trait ListFn<'a, T, Args>: Fn(DbConn<'a>, Args) -> ResultFuture<'a, Vec> {} impl<'a, T, Args, F: Fn(DbConn<'a>, Args) -> ResultFuture<'a, Vec>> ListFn<'a, T, Args> for F {} /// Allows read and list functions to capture a shared closure that has an inferred return type, which is useful for join logic pub struct Queries { pub read_fn: RF, pub list_fn: LF, } // `()` is used to prevent type inference error impl Queries<(), ()> { pub fn new<'a, RFut, LFut, RT, LT, RA, LA, RF2, LF2>( read_fn: RF2, list_fn: LF2, ) -> Queries, impl ListFn<'a, LT, LA>> where RFut: Future> + Sized + Send + 'a, LFut: Future, DieselError>> + Sized + Send + 'a, RF2: Fn(DbConn<'a>, RA) -> RFut, LF2: Fn(DbConn<'a>, LA) -> LFut, { Queries { read_fn: move |conn, args| read_fn(conn, args).boxed(), list_fn: move |conn, args| list_fn(conn, args).boxed(), } } } impl Queries { pub async fn read<'a, T, Args>( self, pool: &'a mut DbPool<'_>, args: Args, ) -> Result where RF: ReadFn<'a, T, Args>, { let conn = get_conn(pool).await?; (self.read_fn)(conn, args).await } pub async fn list<'a, T, Args>( self, pool: &'a mut DbPool<'_>, args: Args, ) -> Result, DieselError> where LF: ListFn<'a, T, Args>, { let conn = get_conn(pool).await?; (self.list_fn)(conn, args).await } } #[cfg(test)] mod tests { #![allow(clippy::unwrap_used)] #![allow(clippy::indexing_slicing)] use super::{fuzzy_search, *}; use crate::utils::is_email_regex; use pretty_assertions::assert_eq; #[test] fn test_fuzzy_search() { let test = "This %is% _a_ fuzzy search"; assert_eq!( fuzzy_search(test), "%This%\\%is\\%%\\_a\\_%fuzzy%search%".to_string() ); } #[test] fn test_email() { assert!(is_email_regex("gush@gmail.com")); assert!(!is_email_regex("nada_neutho")); } #[test] fn test_diesel_option_overwrite() { assert_eq!(diesel_option_overwrite(None), None); assert_eq!(diesel_option_overwrite(Some(String::new())), Some(None)); assert_eq!( diesel_option_overwrite(Some("test".to_string())), Some(Some("test".to_string())) ); } #[test] fn test_diesel_option_overwrite_to_url() { assert!(matches!(diesel_option_overwrite_to_url(&None), Ok(None))); assert!(matches!( diesel_option_overwrite_to_url(&Some(String::new())), Ok(Some(None)) )); assert!(diesel_option_overwrite_to_url(&Some("invalid_url".to_string())).is_err()); let example_url = "https://example.com"; assert!(matches!( diesel_option_overwrite_to_url(&Some(example_url.to_string())), Ok(Some(Some(url))) if url == Url::parse(example_url).unwrap().into() )); } }