use std::borrow::Cow;
use anyhow::{
Result,
bail,
};
use chrono::{
DateTime,
FixedOffset,
Local,
};
use sqlx::{
Pool,
Postgres,
Row,
postgres::PgPoolOptions,
pool::PoolConnection,
};
#[derive(sqlx::FromRow, Debug)]
pub struct List {
pub source_id: i32,
pub channel: String,
pub enabled: bool,
pub url: String,
pub iv_hash: Option<String>,
pub url_re: Option<String>,
}
#[derive(sqlx::FromRow, Debug)]
pub struct Source {
pub channel_id: i64,
pub url: String,
pub iv_hash: Option<String>,
pub owner: i64,
pub url_re: Option<String>,
}
#[derive(sqlx::FromRow)]
pub struct Queue {
pub source_id: Option<i32>,
pub next_fetch: Option<DateTime<Local>>,
pub owner: Option<i64>,
}
#[derive(Clone)]
pub struct Db {
pool: sqlx::Pool<sqlx::Postgres>,
}
pub struct Conn{
conn: PoolConnection<Postgres>,
}
impl Db {
pub fn new (pguri: &str) -> Result<Db> {
Ok(Db{
pool: PgPoolOptions::new()
.max_connections(5)
.acquire_timeout(std::time::Duration::new(300, 0))
.idle_timeout(std::time::Duration::new(60, 0))
.connect_lazy(pguri)?,
})
}
pub async fn begin(&mut self) -> Result<Conn> {
Conn::new(&mut self.pool).await
}
}
impl Conn {
pub async fn new (pool: &mut Pool<Postgres>) -> Result<Conn> {
let conn = pool.acquire().await?;
Ok(Conn{
conn,
})
}
pub async fn add_post (&mut self, id: i32, date: &DateTime<FixedOffset>, post_url: &str) -> Result<()> {
sqlx::query("insert into rsstg_post (source_id, posted, url) values ($1, $2, $3);")
.bind(id)
.bind(date)
.bind(post_url)
.execute(&mut *self.conn).await?;
Ok(())
}
pub async fn clean (&mut self, source_id: i32, owner: i64) -> Result<Cow<'_, str>> {
match sqlx::query("delete from rsstg_post p using rsstg_source s where p.source_id = $1 and owner = $2 and p.source_id = s.source_id;")
.bind(source_id)
.bind(owner)
.execute(&mut *self.conn).await?.rows_affected() {
0 => { Ok("No data found found.".into()) },
x => { Ok(format!("{x} posts purged.").into()) },
}
}
pub async fn delete (&mut self, source_id: i32, owner: i64) -> Result<Cow<'_, str>> {
match sqlx::query("delete from rsstg_source where source_id = $1 and owner = $2;")
.bind(source_id)
.bind(owner)
.execute(&mut *self.conn).await?.rows_affected() {
0 => { Ok("No data found found.".into()) },
x => { Ok(format!("{} sources removed.", x).into()) },
}
}
pub async fn disable (&mut self, source_id: i32, owner: i64) -> Result<&str> {
match sqlx::query("update rsstg_source set enabled = false where source_id = $1 and owner = $2")
.bind(source_id)
.bind(owner)
.execute(&mut *self.conn).await?.rows_affected() {
1 => { Ok("Source disabled.") },
0 => { Ok("Source not found.") },
_ => { bail!("Database error.") },
}
}
pub async fn enable (&mut self, source_id: i32, owner: i64) -> Result<&str> {
match sqlx::query("update rsstg_source set enabled = true where source_id = $1 and owner = $2")
.bind(source_id)
.bind(owner)
.execute(&mut *self.conn).await?.rows_affected() {
1 => { Ok("Source enabled.") },
0 => { Ok("Source not found.") },
_ => { bail!("Database error.") },
}
}
pub async fn exists (&mut self, post_url: &str, id: i32) -> Result<Option<bool>> {
let row = sqlx::query("select exists(select true from rsstg_post where url = $1 and source_id = $2) as exists;")
.bind(post_url)
.bind(id)
.fetch_one(&mut *self.conn).await?;
let exists: Option<bool> = row.try_get("exists")?;
Ok(exists)
}
pub async fn get_queue (&mut self) -> Result<Vec<Queue>> {
let block: Vec<Queue> = sqlx::query_as("select source_id, next_fetch, owner from rsstg_order natural left join rsstg_source where next_fetch < now() + interval '1 minute';")
.fetch_all(&mut *self.conn).await?;
Ok(block)
}
pub async fn get_list (&mut self, owner: i64) -> Result<Vec<List>> {
let source: Vec<List> = sqlx::query_as("select source_id, channel, enabled, url, iv_hash, url_re from rsstg_source where owner = $1 order by source_id")
.bind(owner)
.fetch_all(&mut *self.conn).await?;
Ok(source)
}
pub async fn get_source (&mut self, id: i32, owner: i64) -> Result<Source> {
let source: Source = sqlx::query_as("select channel_id, url, iv_hash, owner, url_re from rsstg_source where source_id = $1 and owner = $2")
.bind(id)
.bind(owner)
.fetch_one(&mut *self.conn).await?;
Ok(source)
}
pub async fn set_scrape (&mut self, id: i32) -> Result<()> {
sqlx::query("update rsstg_source set last_scrape = now() where source_id = $1;")
.bind(id)
.execute(&mut *self.conn).await?;
Ok(())
}
pub async fn update (&mut self, update: Option<i32>, channel: &str, channel_id: i64, url: &str, iv_hash: Option<&str>, url_re: Option<&str>, owner: i64) -> Result<&str> {
match match update {
Some(id) => {
sqlx::query("update rsstg_source set channel_id = $2, url = $3, iv_hash = $4, owner = $5, channel = $6, url_re = $7 where source_id = $1")
.bind(id)
},
None => {
sqlx::query("insert into rsstg_source (channel_id, url, iv_hash, owner, channel, url_re) values ($1, $2, $3, $4, $5, $6)")
},
}
.bind(channel_id)
.bind(url)
.bind(iv_hash)
.bind(owner)
.bind(channel)
.bind(url_re)
.execute(&mut *self.conn).await
{
Ok(_) => Ok(match update {
Some(_) => "Channel updated.",
None => "Channel added.",
}),
Err(sqlx::Error::Database(err)) => {
match err.downcast::<sqlx::postgres::PgDatabaseError>().routine() {
Some("_bt_check_unique", ) => {
Ok("Duplicate key.")
},
Some(_) => {
Ok("Database error.")
},
None => {
Ok("No database error extracted.")
},
}
},
Err(err) => {
bail!("Sorry, unknown error:\n{err:#?}\n");
},
}
}
}