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/*
* SPDX-FileCopyrightText: 2020 Stalwart Labs Ltd <hello@stalw.art>
*
* SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
*/
use futures::TryStreamExt;
use mysql_async::{prelude::Queryable, Row};
use roaring::RoaringBitmap;
use crate::{
write::{key::DeserializeBigEndian, BitmapClass, ValueClass},
BitmapKey, Deserialize, IterateParams, Key, ValueKey, U32_LEN,
};
use super::{into_error, MysqlStore};
impl MysqlStore {
pub(crate) async fn get_value<U>(&self, key: impl Key) -> trc::Result<Option<U>>
where
U: Deserialize + 'static,
{
let mut conn = self.conn_pool.get_conn().await.map_err(into_error)?;
let s = conn
.prep(&format!(
"SELECT v FROM {} WHERE k = ?",
char::from(key.subspace())
))
.await
.map_err(into_error)?;
let key = key.serialize(0);
conn.exec_first::<Vec<u8>, _, _>(&s, (key,))
.await
.map_err(into_error)
.and_then(|r| {
if let Some(r) = r {
Ok(Some(U::deserialize(&r)?))
} else {
Ok(None)
}
})
}
pub(crate) async fn get_bitmap(
&self,
mut key: BitmapKey<BitmapClass<u32>>,
) -> trc::Result<Option<RoaringBitmap>> {
let begin = key.serialize(0);
key.document_id = u32::MAX;
let key_len = begin.len();
let end = key.serialize(0);
let mut conn = self.conn_pool.get_conn().await.map_err(into_error)?;
let table = char::from(key.subspace());
let mut bm = RoaringBitmap::new();
let s = conn
.prep(&format!("SELECT k FROM {table} WHERE k >= ? AND k <= ?"))
.await
.map_err(into_error)?;
let mut rows = conn
.exec_stream::<Vec<u8>, _, _>(&s, (begin, end))
.await
.map_err(into_error)?;
while let Some(key) = rows.try_next().await.map_err(into_error)? {
if key.len() == key_len {
bm.insert(key.as_slice().deserialize_be_u32(key.len() - U32_LEN)?);
}
}
Ok(if !bm.is_empty() { Some(bm) } else { None })
}
pub(crate) async fn iterate<T: Key>(
&self,
params: IterateParams<T>,
mut cb: impl for<'x> FnMut(&'x [u8], &'x [u8]) -> trc::Result<bool> + Sync + Send,
) -> trc::Result<()> {
let mut conn = self.conn_pool.get_conn().await.map_err(into_error)?;
let table = char::from(params.begin.subspace());
let begin = params.begin.serialize(0);
let end = params.end.serialize(0);
let keys = if params.values { "k, v" } else { "k" };
let s = conn
.prep(&match (params.first, params.ascending) {
(true, true) => {
format!(
"SELECT {keys} FROM {table} WHERE k >= ? AND k <= ? ORDER BY k ASC LIMIT 1"
)
}
(true, false) => {
format!(
"SELECT {keys} FROM {table} WHERE k >= ? AND k <= ? ORDER BY k DESC LIMIT 1"
)
}
(false, true) => {
format!("SELECT {keys} FROM {table} WHERE k >= ? AND k <= ? ORDER BY k ASC")
}
(false, false) => {
format!("SELECT {keys} FROM {table} WHERE k >= ? AND k <= ? ORDER BY k DESC")
}
})
.await
.map_err(into_error)?;
let mut rows = conn
.exec_stream::<Row, _, _>(&s, (begin, end))
.await
.map_err(into_error)?;
if params.values {
while let Some(mut row) = rows.try_next().await.map_err(into_error)? {
let value = row
.take_opt::<Vec<u8>, _>(1)
.unwrap_or_else(|| Ok(vec![]))
.map_err(into_error)?;
let key = row
.take_opt::<Vec<u8>, _>(0)
.unwrap_or_else(|| Ok(vec![]))
.map_err(into_error)?;
if !cb(&key, &value)? {
break;
}
}
} else {
while let Some(mut row) = rows.try_next().await.map_err(into_error)? {
if !cb(
&row.take_opt::<Vec<u8>, _>(0)
.unwrap_or_else(|| Ok(vec![]))
.map_err(into_error)?,
b"",
)? {
break;
}
}
}
Ok(())
}
pub(crate) async fn get_counter(
&self,
key: impl Into<ValueKey<ValueClass<u32>>> + Sync + Send,
) -> trc::Result<i64> {
let key = key.into();
let table = char::from(key.subspace());
let key = key.serialize(0);
let mut conn = self.conn_pool.get_conn().await.map_err(into_error)?;
let s = conn
.prep(&format!("SELECT v FROM {table} WHERE k = ?"))
.await
.map_err(into_error)?;
match conn.exec_first::<i64, _, _>(&s, (key,)).await {
Ok(Some(num)) => Ok(num),
Ok(None) => Ok(0),
Err(e) => Err(into_error(e)),
}
}
}
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