mirror of
https://github.com/LemmyNet/lemmy.git
synced 2024-12-25 12:21:31 +00:00
609 lines
17 KiB
Rust
609 lines
17 KiB
Rust
use crate::{newtypes::DbUrl, CommentSortType, SortType};
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use chrono::{DateTime, TimeDelta, Utc};
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use deadpool::Runtime;
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use diesel::{
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helper_types::AsExprOf,
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pg::Pg,
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query_builder::{Query, QueryFragment},
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query_dsl::methods::LimitDsl,
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result::{
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ConnectionError,
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ConnectionResult,
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Error::{self as DieselError, QueryBuilderError},
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},
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sql_types::{self, Timestamptz},
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IntoSql,
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OptionalExtension,
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};
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use diesel_async::{
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pg::AsyncPgConnection,
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pooled_connection::{
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deadpool::{Hook, HookError, Object as PooledConnection, Pool},
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AsyncDieselConnectionManager,
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ManagerConfig,
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},
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SimpleAsyncConnection,
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};
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use futures_util::{future::BoxFuture, Future, FutureExt};
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use i_love_jesus::CursorKey;
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use lemmy_utils::{
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error::{LemmyErrorExt, LemmyErrorType, LemmyResult},
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settings::SETTINGS,
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};
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use once_cell::sync::Lazy;
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use regex::Regex;
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use rustls::{
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client::danger::{
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DangerousClientConfigBuilder,
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HandshakeSignatureValid,
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ServerCertVerified,
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ServerCertVerifier,
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},
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crypto::{self, verify_tls12_signature, verify_tls13_signature},
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pki_types::{CertificateDer, ServerName, UnixTime},
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ClientConfig,
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DigitallySignedStruct,
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SignatureScheme,
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};
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use std::{
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ops::{Deref, DerefMut},
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sync::Arc,
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time::Duration,
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};
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use tracing::error;
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use url::Url;
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const FETCH_LIMIT_DEFAULT: i64 = 10;
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pub const FETCH_LIMIT_MAX: i64 = 50;
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pub const SITEMAP_LIMIT: i64 = 50000;
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pub const SITEMAP_DAYS: Option<TimeDelta> = TimeDelta::try_days(31);
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pub const RANK_DEFAULT: f64 = 0.0001;
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pub type ActualDbPool = Pool<AsyncPgConnection>;
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/// References a pool or connection. Functions must take `&mut DbPool<'_>` to allow implicit reborrowing.
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///
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/// https://github.com/rust-lang/rfcs/issues/1403
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pub enum DbPool<'a> {
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Pool(&'a ActualDbPool),
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Conn(&'a mut AsyncPgConnection),
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}
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pub enum DbConn<'a> {
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Pool(PooledConnection<AsyncPgConnection>),
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Conn(&'a mut AsyncPgConnection),
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}
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pub async fn get_conn<'a, 'b: 'a>(pool: &'a mut DbPool<'b>) -> Result<DbConn<'a>, DieselError> {
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Ok(match pool {
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DbPool::Pool(pool) => DbConn::Pool(pool.get().await.map_err(|e| QueryBuilderError(e.into()))?),
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DbPool::Conn(conn) => DbConn::Conn(conn),
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})
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}
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impl<'a> Deref for DbConn<'a> {
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type Target = AsyncPgConnection;
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fn deref(&self) -> &Self::Target {
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match self {
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DbConn::Pool(conn) => conn.deref(),
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DbConn::Conn(conn) => conn.deref(),
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}
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}
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}
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impl<'a> DerefMut for DbConn<'a> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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match self {
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DbConn::Pool(conn) => conn.deref_mut(),
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DbConn::Conn(conn) => conn.deref_mut(),
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}
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}
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}
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// Allows functions that take `DbPool<'_>` to be called in a transaction by passing `&mut conn.into()`
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impl<'a> From<&'a mut AsyncPgConnection> for DbPool<'a> {
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fn from(value: &'a mut AsyncPgConnection) -> Self {
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DbPool::Conn(value)
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}
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}
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impl<'a, 'b: 'a> From<&'a mut DbConn<'b>> for DbPool<'a> {
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fn from(value: &'a mut DbConn<'b>) -> Self {
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DbPool::Conn(value.deref_mut())
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}
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}
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impl<'a> From<&'a ActualDbPool> for DbPool<'a> {
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fn from(value: &'a ActualDbPool) -> Self {
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DbPool::Pool(value)
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}
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}
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/// Runs multiple async functions that take `&mut DbPool<'_>` as input and return `Result`. Only works when the `futures` crate is listed in `Cargo.toml`.
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///
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/// `$pool` is the value given to each function.
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///
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/// A `Result` is returned (not in a `Future`, so don't use `.await`). The `Ok` variant contains a tuple with the values returned by the given functions.
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///
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/// The functions run concurrently if `$pool` has the `DbPool::Pool` variant.
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#[macro_export]
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macro_rules! try_join_with_pool {
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($pool:ident => ($($func:expr),+)) => {{
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// Check type
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let _: &mut $crate::utils::DbPool<'_> = $pool;
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match $pool {
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// Run concurrently with `try_join`
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$crate::utils::DbPool::Pool(__pool) => ::futures::try_join!(
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$(async {
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let mut __dbpool = $crate::utils::DbPool::Pool(__pool);
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($func)(&mut __dbpool).await
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}),+
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),
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// Run sequentially
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$crate::utils::DbPool::Conn(__conn) => async {
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Ok(($({
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let mut __dbpool = $crate::utils::DbPool::Conn(__conn);
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// `?` prevents the error type from being inferred in an `async` block, so `match` is used instead
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match ($func)(&mut __dbpool).await {
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::core::result::Result::Ok(__v) => __v,
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::core::result::Result::Err(__v) => return ::core::result::Result::Err(__v),
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}
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}),+))
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}.await,
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}
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}};
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}
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pub struct ReverseTimestampKey<K>(pub K);
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impl<K, C> CursorKey<C> for ReverseTimestampKey<K>
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where
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K: CursorKey<C, SqlType = Timestamptz>,
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{
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type SqlType = sql_types::BigInt;
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type CursorValue = functions::reverse_timestamp_sort::HelperType<K::CursorValue>;
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type SqlValue = functions::reverse_timestamp_sort::HelperType<K::SqlValue>;
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fn get_cursor_value(cursor: &C) -> Self::CursorValue {
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functions::reverse_timestamp_sort(K::get_cursor_value(cursor))
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}
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fn get_sql_value() -> Self::SqlValue {
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functions::reverse_timestamp_sort(K::get_sql_value())
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}
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}
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/// Includes an SQL comment before `T`, which can be used to label auto_explain output
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#[derive(QueryId)]
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pub struct Commented<T> {
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comment: String,
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inner: T,
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}
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impl<T> Commented<T> {
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pub fn new(inner: T) -> Self {
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Commented {
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comment: String::new(),
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inner,
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}
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}
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/// Adds `text` to the comment if `condition` is true
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pub fn text_if(mut self, text: &str, condition: bool) -> Self {
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if condition {
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if !self.comment.is_empty() {
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self.comment.push_str(", ");
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}
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self.comment.push_str(text);
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}
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self
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}
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/// Adds `text` to the comment
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pub fn text(self, text: &str) -> Self {
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self.text_if(text, true)
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}
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}
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impl<T: Query> Query for Commented<T> {
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type SqlType = T::SqlType;
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}
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impl<T: QueryFragment<Pg>> QueryFragment<Pg> for Commented<T> {
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fn walk_ast<'b>(
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&'b self,
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mut out: diesel::query_builder::AstPass<'_, 'b, Pg>,
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) -> Result<(), DieselError> {
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for line in self.comment.lines() {
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out.push_sql("\n-- ");
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out.push_sql(line);
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}
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out.push_sql("\n");
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self.inner.walk_ast(out.reborrow())
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}
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}
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impl<T: LimitDsl> LimitDsl for Commented<T> {
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type Output = Commented<T::Output>;
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fn limit(self, limit: i64) -> Self::Output {
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Commented {
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comment: self.comment,
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inner: self.inner.limit(limit),
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}
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}
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}
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pub fn fuzzy_search(q: &str) -> String {
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let replaced = q
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.replace('\\', "\\\\")
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.replace('%', "\\%")
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.replace('_', "\\_")
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.replace(' ', "%");
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format!("%{replaced}%")
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}
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pub fn limit_and_offset(
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page: Option<i64>,
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limit: Option<i64>,
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) -> Result<(i64, i64), diesel::result::Error> {
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let page = match page {
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Some(page) => {
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if page < 1 {
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return Err(QueryBuilderError("Page is < 1".into()));
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}
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page
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}
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None => 1,
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};
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let limit = match limit {
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Some(limit) => {
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if !(1..=FETCH_LIMIT_MAX).contains(&limit) {
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return Err(QueryBuilderError(
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format!("Fetch limit is > {FETCH_LIMIT_MAX}").into(),
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));
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}
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limit
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}
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None => FETCH_LIMIT_DEFAULT,
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};
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let offset = limit * (page - 1);
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Ok((limit, offset))
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}
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pub fn limit_and_offset_unlimited(page: Option<i64>, limit: Option<i64>) -> (i64, i64) {
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let limit = limit.unwrap_or(FETCH_LIMIT_DEFAULT);
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let offset = limit * (page.unwrap_or(1) - 1);
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(limit, offset)
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}
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pub fn is_email_regex(test: &str) -> bool {
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EMAIL_REGEX.is_match(test)
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}
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pub fn diesel_option_overwrite(opt: Option<String>) -> Option<Option<String>> {
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match opt {
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// An empty string is an erase
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Some(unwrapped) => {
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if !unwrapped.eq("") {
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Some(Some(unwrapped))
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} else {
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Some(None)
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}
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}
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None => None,
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}
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}
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pub fn diesel_option_overwrite_to_url(opt: &Option<String>) -> LemmyResult<Option<Option<DbUrl>>> {
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match opt.as_ref().map(String::as_str) {
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// An empty string is an erase
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Some("") => Ok(Some(None)),
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Some(str_url) => Url::parse(str_url)
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.map(|u| Some(Some(u.into())))
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.with_lemmy_type(LemmyErrorType::InvalidUrl),
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None => Ok(None),
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}
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}
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pub fn diesel_option_overwrite_to_url_create(opt: &Option<String>) -> LemmyResult<Option<DbUrl>> {
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match opt.as_ref().map(String::as_str) {
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// An empty string is nothing
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Some("") => Ok(None),
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Some(str_url) => Url::parse(str_url)
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.map(|u| Some(u.into()))
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.with_lemmy_type(LemmyErrorType::InvalidUrl),
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None => Ok(None),
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}
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}
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fn establish_connection(config: &str) -> BoxFuture<ConnectionResult<AsyncPgConnection>> {
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let fut = async {
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let rustls_config = DangerousClientConfigBuilder {
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cfg: ClientConfig::builder(),
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}
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.with_custom_certificate_verifier(Arc::new(NoCertVerifier {}))
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.with_no_client_auth();
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let tls = tokio_postgres_rustls::MakeRustlsConnect::new(rustls_config);
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let (client, conn) = tokio_postgres::connect(config, tls)
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.await
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.map_err(|e| ConnectionError::BadConnection(e.to_string()))?;
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tokio::spawn(async move {
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if let Err(e) = conn.await {
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error!("Database connection failed: {e}");
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}
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});
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let mut conn = AsyncPgConnection::try_from(client).await?;
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// * Change geqo_threshold back to default value if it was changed, so it's higher than the collapse limits
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// * Change collapse limits from 8 to 11 so the query planner can find a better table join order for more complicated queries
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conn
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.batch_execute("SET geqo_threshold=12;SET from_collapse_limit=11;SET join_collapse_limit=11;")
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.await
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.map_err(ConnectionError::CouldntSetupConfiguration)?;
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Ok(conn)
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};
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fut.boxed()
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}
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#[derive(Debug)]
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struct NoCertVerifier {}
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impl ServerCertVerifier for NoCertVerifier {
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fn verify_server_cert(
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&self,
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_end_entity: &CertificateDer,
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_intermediates: &[CertificateDer],
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_server_name: &ServerName,
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_ocsp: &[u8],
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_now: UnixTime,
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) -> Result<ServerCertVerified, rustls::Error> {
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// Will verify all (even invalid) certs without any checks (sslmode=require)
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Ok(ServerCertVerified::assertion())
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}
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fn verify_tls12_signature(
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&self,
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message: &[u8],
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cert: &CertificateDer,
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dss: &DigitallySignedStruct,
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) -> Result<HandshakeSignatureValid, rustls::Error> {
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verify_tls12_signature(
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message,
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cert,
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dss,
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&crypto::ring::default_provider().signature_verification_algorithms,
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)
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}
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fn verify_tls13_signature(
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&self,
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message: &[u8],
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cert: &CertificateDer,
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dss: &DigitallySignedStruct,
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) -> Result<HandshakeSignatureValid, rustls::Error> {
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verify_tls13_signature(
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message,
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cert,
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dss,
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&crypto::ring::default_provider().signature_verification_algorithms,
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)
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}
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fn supported_verify_schemes(&self) -> Vec<SignatureScheme> {
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crypto::ring::default_provider()
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.signature_verification_algorithms
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.supported_schemes()
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}
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}
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pub async fn build_db_pool() -> LemmyResult<ActualDbPool> {
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let db_url = SETTINGS.get_database_url();
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// We only support TLS with sslmode=require currently
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let tls_enabled = db_url.contains("sslmode=require");
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let manager = if tls_enabled {
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// diesel-async does not support any TLS connections out of the box, so we need to manually
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// provide a setup function which handles creating the connection
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let mut config = ManagerConfig::default();
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config.custom_setup = Box::new(establish_connection);
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AsyncDieselConnectionManager::<AsyncPgConnection>::new_with_config(&db_url, config)
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} else {
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AsyncDieselConnectionManager::<AsyncPgConnection>::new(&db_url)
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};
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let pool = Pool::builder(manager)
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.max_size(SETTINGS.database.pool_size)
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.runtime(Runtime::Tokio1)
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// Limit connection age to prevent use of prepared statements that have query plans based on very old statistics
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.pre_recycle(Hook::sync_fn(|_conn, metrics| {
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// Preventing the first recycle can cause an infinite loop when trying to get a new connection from the pool
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let conn_was_used = metrics.recycled.is_some();
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if metrics.age() > Duration::from_secs(3 * 24 * 60 * 60) && conn_was_used {
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Err(HookError::Continue(None))
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} else {
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Ok(())
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}
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}))
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.build()?;
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crate::schema_setup::run(&db_url)?;
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Ok(pool)
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}
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pub async fn build_db_pool_for_tests() -> ActualDbPool {
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build_db_pool().await.expect("db pool missing")
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}
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pub fn naive_now() -> DateTime<Utc> {
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Utc::now()
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}
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pub fn post_to_comment_sort_type(sort: SortType) -> CommentSortType {
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match sort {
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SortType::Active | SortType::Hot | SortType::Scaled => CommentSortType::Hot,
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SortType::New | SortType::NewComments | SortType::MostComments => CommentSortType::New,
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SortType::Old => CommentSortType::Old,
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SortType::Controversial => CommentSortType::Controversial,
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SortType::TopHour
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| SortType::TopSixHour
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| SortType::TopTwelveHour
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| SortType::TopDay
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| SortType::TopAll
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| SortType::TopWeek
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| SortType::TopYear
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| SortType::TopMonth
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| SortType::TopThreeMonths
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| SortType::TopSixMonths
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| SortType::TopNineMonths => CommentSortType::Top,
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}
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}
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static EMAIL_REGEX: Lazy<Regex> = Lazy::new(|| {
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Regex::new(r"^[a-zA-Z0-9.!#$%&’*+/=?^_`{|}~-]+@[a-zA-Z0-9-]+(?:\.[a-zA-Z0-9-]+)*$")
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.expect("compile email regex")
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});
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pub mod functions {
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use diesel::sql_types::{BigInt, Text, Timestamptz};
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sql_function! {
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#[sql_name = "r.hot_rank"]
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fn hot_rank(score: BigInt, time: Timestamptz) -> Double;
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}
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sql_function! {
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#[sql_name = "r.scaled_rank"]
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fn scaled_rank(score: BigInt, time: Timestamptz, users_active_month: BigInt) -> Double;
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}
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sql_function! {
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#[sql_name = "r.controversy_rank"]
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fn controversy_rank(upvotes: BigInt, downvotes: BigInt, score: BigInt) -> Double;
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}
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sql_function!(fn reverse_timestamp_sort(time: Timestamptz) -> BigInt);
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sql_function!(fn lower(x: Text) -> Text);
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// really this function is variadic, this just adds the two-argument version
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sql_function!(fn coalesce<T: diesel::sql_types::SqlType + diesel::sql_types::SingleValue>(x: diesel::sql_types::Nullable<T>, y: T) -> T);
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}
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pub const DELETED_REPLACEMENT_TEXT: &str = "*Permanently Deleted*";
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pub fn now() -> AsExprOf<diesel::dsl::now, diesel::sql_types::Timestamptz> {
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// https://github.com/diesel-rs/diesel/issues/1514
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diesel::dsl::now.into_sql::<Timestamptz>()
|
||
}
|
||
|
||
pub type ResultFuture<'a, T> = BoxFuture<'a, Result<T, DieselError>>;
|
||
|
||
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<T>> {}
|
||
|
||
impl<'a, T, Args, F: Fn(DbConn<'a>, Args) -> ResultFuture<'a, Vec<T>>> 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<RF, LF> {
|
||
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 ReadFn<'a, RT, RA>, impl ListFn<'a, LT, LA>>
|
||
where
|
||
RFut: Future<Output = Result<RT, DieselError>> + Sized + Send + 'a,
|
||
LFut: Future<Output = Result<Vec<LT>, 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<RF, LF> Queries<RF, LF> {
|
||
pub async fn read<'a, T, Args>(
|
||
self,
|
||
pool: &'a mut DbPool<'_>,
|
||
args: Args,
|
||
) -> Result<Option<T>, DieselError>
|
||
where
|
||
RF: ReadFn<'a, T, Args>,
|
||
{
|
||
let conn = get_conn(pool).await?;
|
||
(self.read_fn)(conn, args).await.optional()
|
||
}
|
||
|
||
pub async fn list<'a, T, Args>(
|
||
self,
|
||
pool: &'a mut DbPool<'_>,
|
||
args: Args,
|
||
) -> Result<Vec<T>, DieselError>
|
||
where
|
||
LF: ListFn<'a, T, Args>,
|
||
{
|
||
let conn = get_conn(pool).await?;
|
||
(self.list_fn)(conn, args).await
|
||
}
|
||
}
|
||
|
||
#[cfg(test)]
|
||
#[allow(clippy::unwrap_used)]
|
||
#[allow(clippy::indexing_slicing)]
|
||
mod tests {
|
||
|
||
use super::*;
|
||
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()
|
||
));
|
||
}
|
||
}
|