lemmy/crates/db_schema/src/utils.rs

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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<AsyncPgConnection>;
/// 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<AsyncPgConnection>),
Conn(&'a mut AsyncPgConnection),
}
pub async fn get_conn<'a, 'b: 'a>(pool: &'a mut DbPool<'b>) -> Result<DbConn<'a>, 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<K>(pub K);
impl<K, C> CursorKey<C> for ReverseTimestampKey<K>
where
K: CursorKey<C, SqlType = Timestamptz>,
{
type SqlType = sql_types::BigInt;
type CursorValue = functions::reverse_timestamp_sort::HelperType<K::CursorValue>;
type SqlValue = functions::reverse_timestamp_sort::HelperType<K::SqlValue>;
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<T> {
comment: String,
inner: T,
}
impl<T> Commented<T> {
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<T: Query> Query for Commented<T> {
type SqlType = T::SqlType;
}
impl<T: QueryFragment<Pg>> QueryFragment<Pg> for Commented<T> {
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<T: LimitDsl> LimitDsl for Commented<T> {
type Output = Commented<T::Output>;
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<i64>,
limit: Option<i64>,
) -> 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<i64>, limit: Option<i64>) -> (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<String>) -> Option<Option<String>> {
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<String>,
) -> Result<Option<Option<DbUrl>>, 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<String>,
) -> Result<Option<DbUrl>, 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<ConnectionResult<AsyncPgConnection>> {
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<Item = &[u8]>,
_ocsp_response: &[u8],
_now: SystemTime,
) -> Result<ServerCertVerified, rustls::Error> {
// 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<ActualDbPool, LemmyError> {
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::<AsyncPgConnection>::new_with_config(&db_url, config)
} else {
AsyncDieselConnectionManager::<AsyncPgConnection>::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> {
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<Regex> = 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<T: diesel::sql_types::SqlType + diesel::sql_types::SingleValue>(x: diesel::sql_types::Nullable<T>, y: T) -> T);
}
pub const DELETED_REPLACEMENT_TEXT: &str = "*Permanently Deleted*";
pub fn now() -> AsExprOf<diesel::dsl::now, diesel::sql_types::Timestamptz> {
// https://github.com/diesel-rs/diesel/issues/1514
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<T, DieselError>
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<Vec<T>, 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()
));
}
}