lemmy/crates/db_schema/src/utils.rs

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use crate::{
diesel::Connection,
diesel_migrations::MigrationHarness,
newtypes::DbUrl,
CommentSortType,
SortType,
};
use activitypub_federation::{core::object_id::ObjectId, traits::ApubObject};
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use bb8::PooledConnection;
use chrono::NaiveDateTime;
use diesel::{
backend::Backend,
deserialize::FromSql,
pg::Pg,
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result::{Error as DieselError, Error::QueryBuilderError},
serialize::{Output, ToSql},
sql_types::Text,
PgConnection,
};
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use diesel_async::{
pg::AsyncPgConnection,
pooled_connection::{bb8::Pool, AsyncDieselConnectionManager},
};
use diesel_migrations::EmbeddedMigrations;
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use lemmy_utils::{error::LemmyError, settings::structs::Settings};
use once_cell::sync::Lazy;
use regex::Regex;
use std::{env, env::VarError};
use tracing::info;
use url::Url;
const FETCH_LIMIT_DEFAULT: i64 = 10;
pub const FETCH_LIMIT_MAX: i64 = 50;
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pub type DbPool = Pool<AsyncPgConnection>;
pub async fn get_conn(
pool: &DbPool,
) -> Result<PooledConnection<AsyncDieselConnectionManager<AsyncPgConnection>>, DieselError> {
pool.get().await.map_err(|e| QueryBuilderError(e.into()))
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}
pub fn get_database_url_from_env() -> Result<String, VarError> {
env::var("LEMMY_DATABASE_URL")
}
pub fn fuzzy_search(q: &str) -> String {
let replaced = q.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.clone()))
} 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(std::string::String::as_str) {
// An empty string is an erase
Some("") => Ok(Some(None)),
Some(str_url) => match Url::parse(str_url) {
Ok(url) => Ok(Some(Some(url.into()))),
Err(e) => Err(LemmyError::from_error_message(e, "invalid_url")),
},
None => Ok(None),
}
}
pub fn diesel_option_overwrite_to_url_create(
opt: &Option<String>,
) -> Result<Option<DbUrl>, LemmyError> {
match opt.as_ref().map(std::string::String::as_str) {
// An empty string is nothing
Some("") => Ok(None),
Some(str_url) => match Url::parse(str_url) {
Ok(url) => Ok(Some(url.into())),
Err(e) => Err(LemmyError::from_error_message(e, "invalid_url")),
},
None => Ok(None),
}
}
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async fn build_db_pool_settings_opt(settings: Option<&Settings>) -> Result<DbPool, LemmyError> {
let db_url = get_database_url(settings);
let pool_size = settings.map(|s| s.database.pool_size).unwrap_or(5);
let manager = AsyncDieselConnectionManager::<AsyncPgConnection>::new(&db_url);
let pool = Pool::builder()
.max_size(pool_size)
.min_idle(Some(1))
.build(manager)
.await?;
// If there's no settings, that means its a unit test, and migrations need to be run
if settings.is_none() {
run_migrations(&db_url);
}
Ok(pool)
}
pub const MIGRATIONS: EmbeddedMigrations = embed_migrations!();
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pub fn run_migrations(db_url: &str) {
// Needs to be a sync connection
let mut conn =
PgConnection::establish(db_url).unwrap_or_else(|_| panic!("Error connecting to {db_url}"));
info!("Running Database migrations (This may take a long time)...");
let _ = &mut conn
.run_pending_migrations(MIGRATIONS)
.unwrap_or_else(|_| panic!("Couldn't run DB Migrations"));
info!("Database migrations complete.");
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}
pub async fn build_db_pool(settings: &Settings) -> Result<DbPool, LemmyError> {
build_db_pool_settings_opt(Some(settings)).await
}
pub async fn build_db_pool_for_tests() -> DbPool {
build_db_pool_settings_opt(None)
.await
.expect("db pool missing")
}
pub fn get_database_url(settings: Option<&Settings>) -> String {
// The env var should override anything in the settings config
match get_database_url_from_env() {
Ok(url) => url,
Err(e) => match settings {
Some(settings) => settings.get_database_url(),
None => panic!("Failed to read database URL from env var LEMMY_DATABASE_URL: {e}"),
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},
}
}
pub fn naive_now() -> NaiveDateTime {
chrono::prelude::Utc::now().naive_utc()
}
pub fn post_to_comment_sort_type(sort: SortType) -> CommentSortType {
match sort {
SortType::Active | SortType::Hot => CommentSortType::Hot,
SortType::New | SortType::NewComments | SortType::MostComments => CommentSortType::New,
SortType::Old => CommentSortType::Old,
SortType::TopDay
| SortType::TopAll
| SortType::TopWeek
| SortType::TopYear
| SortType::TopMonth => 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, Timestamp};
sql_function! {
fn hot_rank(score: BigInt, time: Timestamp) -> Integer;
}
sql_function!(fn lower(x: Text) -> Text);
}
impl ToSql<Text, Pg> for DbUrl {
fn to_sql(&self, out: &mut Output<Pg>) -> diesel::serialize::Result {
<std::string::String as ToSql<Text, Pg>>::to_sql(&self.0.to_string(), &mut out.reborrow())
}
}
impl<DB: Backend> FromSql<Text, DB> for DbUrl
where
String: FromSql<Text, DB>,
{
fn from_sql(value: diesel::backend::RawValue<'_, DB>) -> diesel::deserialize::Result<Self> {
let str = String::from_sql(value)?;
Ok(DbUrl(Url::parse(&str)?))
}
}
impl<Kind> From<ObjectId<Kind>> for DbUrl
where
Kind: ApubObject + Send + 'static,
for<'de2> <Kind as ApubObject>::ApubType: serde::Deserialize<'de2>,
{
fn from(id: ObjectId<Kind>) -> Self {
DbUrl(id.into())
}
}
#[cfg(test)]
mod tests {
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!(matches!(
diesel_option_overwrite_to_url(&Some("invalid_url".to_string())),
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()
));
}
}