lemmy/crates/db_schema/src/utils.rs

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use crate::newtypes::DbUrl;
use chrono::NaiveDateTime;
use diesel::{
backend::Backend,
deserialize::FromSql,
serialize::{Output, ToSql},
sql_types::Text,
Connection,
PgConnection,
};
use lemmy_apub_lib::{object_id::ObjectId, traits::ApubObject};
use lemmy_utils::LemmyError;
use once_cell::sync::Lazy;
use regex::Regex;
use std::{env, env::VarError, io::Write};
use url::Url;
pub type DbPool = diesel::r2d2::Pool<diesel::r2d2::ConnectionManager<diesel::PgConnection>>;
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>) -> (i64, i64) {
let page = page.unwrap_or(1);
let limit = limit.unwrap_or(10);
let offset = limit * (page - 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.to_owned()))
} 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(|s| s.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),
}
}
embed_migrations!();
pub fn establish_unpooled_connection() -> PgConnection {
let db_url = match get_database_url_from_env() {
Ok(url) => url,
Err(e) => panic!(
"Failed to read database URL from env var LEMMY_DATABASE_URL: {}",
e
),
};
let conn =
PgConnection::establish(&db_url).unwrap_or_else(|_| panic!("Error connecting to {}", db_url));
embedded_migrations::run(&conn).expect("load migrations");
conn
}
pub fn naive_now() -> NaiveDateTime {
chrono::prelude::Utc::now().naive_utc()
}
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::*;
sql_function! {
fn hot_rank(score: BigInt, time: Timestamp) -> Integer;
}
sql_function!(fn lower(x: Text) -> Text);
}
impl<DB: Backend> ToSql<Text, DB> for DbUrl
where
String: ToSql<Text, DB>,
{
fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> diesel::serialize::Result {
self.0.to_string().to_sql(out)
}
}
impl<DB: Backend> FromSql<Text, DB> for DbUrl
where
String: FromSql<Text, DB>,
{
fn from_sql(bytes: Option<&DB::RawValue>) -> diesel::deserialize::Result<Self> {
let str = String::from_sql(bytes)?;
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("".to_string())), 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("".to_string())),
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()
));
}
}