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|
use std::{
convert::AsRef,
env,
};
use diesel::{
NotFound,
prelude::*,
r2d2::{ConnectionManager, ManageConnection},
};
use diesel::sql_types;
use crate::{Error, Result};
pub use self::models::*;
use self::schema::*;
mod schema;
mod models;
lazy_static! {
static ref DB_URL: String = env::var("DATABASE_URL").expect("no database url in environment").into();
static ref CONN_MGR: ConnectionManager<PgConnection> = ConnectionManager::new(DB_URL.clone());
}
pub fn connection() -> Result<PgConnection> {
CONN_MGR.connect().map_err(Error::from)
}
pub fn find_meme<T: AsRef<str>>(conn: &PgConnection, search: T) -> Result<Meme> {
use diesel::dsl::sql;
use diesel::sql_types::Text;
let search = search.as_ref();
// TODO: check for injection
let mut meme = memes::table
.filter(memes::title.eq(search))
.limit(1)
.first::<Meme>(conn);
if let Err(NotFound) = meme {
let format_search = format!("%{}%", search);
meme = memes::table
.filter(memes::title.ilike(&format_search).or(sql("content ILIKE ").bind::<Text, _>(&format_search)))
.limit(1)
.first::<Meme>(conn);
}
meme
.map_err(Error::from)
}
pub fn delete_meme<T: AsRef<str>>(conn: &PgConnection, search: T, deleted_by: u64) -> Result<()> {
conn.transaction::<(), Error, _>(|| {
let deleted = memes::table
.filter(memes::title.eq(search.as_ref()))
.first::<Meme>(conn)?;
::diesel::delete(memes::table)
.filter(memes::id.eq(deleted.id))
.execute(conn)?;
if let Some(image_id) = deleted.image_id {
let count = memes::table
.filter(memes::image_id.eq(image_id))
.count()
.execute(conn)?;
if count == 0 {
::diesel::delete(images::table)
.filter(images::id.eq(image_id))
.execute(conn)?;
}
}
if let Some(audio_id) = deleted.audio_id {
let count = memes::table
.select(::diesel::dsl::count_star())
.filter(memes::audio_id.eq(audio_id))
.execute(conn)?;
if count == 0 {
::diesel::delete(audio::table)
.filter(audio::id.eq(audio_id))
.execute(conn)?;
}
}
let tombstone = NewTombstone {
deleted_by: deleted_by as i64,
metadata_id: deleted.metadata_id,
meme_id: deleted.id,
};
let _ = ::diesel::insert_into(tombstones::table)
.values(&tombstone)
.execute(conn)?;
Ok(())
})
}
pub fn rand_meme(conn: &PgConnection, audio: bool) -> Result<Meme> {
use rand::{thread_rng, seq::SliceRandom};
use failure::err_msg;
use std::ops::Try;
let ids: Vec<i32> = if audio {
memes::table
.select(memes::id)
.filter(memes::content.is_not_null()
.or(memes::image_id.is_not_null())
.or(memes::audio_id.is_not_null()))
.load(conn)
.map_err(Error::from)?
} else {
memes::table
.select(memes::id)
.filter(memes::content.is_not_null()
.or(memes::image_id.is_not_null()))
.load(conn)
.map_err(Error::from)?
};
let id = ids.choose(&mut thread_rng())
.into_result()
.map_err( |_| err_msg("couldn't load meme"))?;
memes::table
.find(id)
.first::<Meme>(conn)
.map_err(Error::from)
}
pub fn rand_audio_meme(conn: &PgConnection) -> Result<Meme> {
use rand::{thread_rng, seq::SliceRandom};
use failure::err_msg;
use std::ops::Try;
let ids: Vec<i32> = memes::table
.select(memes::id)
.filter(memes::audio_id.is_not_null())
.load(conn)
.map_err(Error::from)?;
let id = ids.choose(&mut thread_rng())
.into_result()
.map_err(|_| err_msg("couldn't load audio meme"))?;
memes::table
.find(id)
.first::<Meme>(conn)
.map_err(Error::from)
}
no_arg_sql_function!(random, sql_types::Double, "SQL random() function");
|
