use crate::{ diesel::Connection, diesel_migrations::MigrationHarness, newtypes::DbUrl, CommentSortType, SortType, }; use activitypub_federation::{fetch::object_id::ObjectId, traits::Object}; use chrono::{DateTime, Utc}; use deadpool::Runtime; use diesel::{ backend::Backend, deserialize::FromSql, helper_types::AsExprOf, pg::Pg, result::{ConnectionError, ConnectionResult, Error as DieselError, Error::QueryBuilderError}, serialize::{Output, ToSql}, sql_types::{Text, Timestamptz}, IntoSql, PgConnection, }; use diesel_async::{ pg::AsyncPgConnection, pooled_connection::{ deadpool::{Object as PooledConnection, Pool}, AsyncDieselConnectionManager, }, }; use diesel_migrations::EmbeddedMigrations; use futures_util::{future::BoxFuture, Future, FutureExt}; 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; const POOL_TIMEOUT: Option = Some(Duration::from_secs(5)); 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 fn fuzzy_search(q: &str) -> String { let replaced = q.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}"); } }); AsyncPgConnection::try_from(client).await }; 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) { // Needs to be a sync connection let mut conn = PgConnection::establish(db_url).unwrap_or_else(|e| panic!("Error connecting to {db_url}: {e}")); info!("Running Database migrations (This may take a long time)..."); let _ = &mut conn .run_pending_migrations(MIGRATIONS) .unwrap_or_else(|e| panic!("Couldn't run DB Migrations: {e}")); info!("Database migrations complete."); } 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 AsyncDieselConnectionManager::::new_with_setup(&db_url, establish_connection) } else { AsyncDieselConnectionManager::::new(&db_url) }; let pool = Pool::builder(manager) .max_size(SETTINGS.database.pool_size) .wait_timeout(POOL_TIMEOUT) .create_timeout(POOL_TIMEOUT) .recycle_timeout(POOL_TIMEOUT) .runtime(Runtime::Tokio1) .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 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*"; impl ToSql for DbUrl { fn to_sql(&self, out: &mut Output) -> diesel::serialize::Result { >::to_sql(&self.0.to_string(), &mut out.reborrow()) } } impl FromSql for DbUrl where String: FromSql, { fn from_sql(value: DB::RawValue<'_>) -> diesel::deserialize::Result { let str = String::from_sql(value)?; Ok(DbUrl(Box::new(Url::parse(&str)?))) } } impl From> for DbUrl where Kind: Object + Send + 'static, for<'de2> ::Kind: serde::Deserialize<'de2>, { fn from(id: ObjectId) -> Self { DbUrl(Box::new(id.into())) } } 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; #[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() )); } }