// Copyright (c) 2021 Anatoly Ikorsky
//
// Licensed under the Apache License, Version 2.0
// <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0> or the MIT
// license <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. All files in the project carrying such notice may not be copied,
// modified, or distributed except according to those terms.
use std::{borrow::Cow, cmp::min, io};
use saturating::Saturating as S;
use crate::{
binlog::{
consts::{BinlogVersion, EventType},
BinlogCtx, BinlogEvent, BinlogStruct,
},
io::ParseBuf,
misc::raw::{bytes::EofBytes, RawBytes, Skip},
proto::{MyDeserialize, MySerialize},
};
use super::BinlogEventHeader;
/// Query that caused the following `ROWS_EVENT`.
///
/// It is used to write the original query in the binlog file in case of row-based replication
/// when the session flag `binlog_rows_query_log_events` is set.
#[derive(Debug, Clone, Eq, PartialEq, Hash)]
pub struct RowsQueryEvent<'a> {
/// Length is ignored.
length: Skip<1>,
query: RawBytes<'a, EofBytes>,
}
impl<'a> RowsQueryEvent<'a> {
/// Creates a new `RowsQueryEvent`.
pub fn new(query: impl Into<Cow<'a, [u8]>>) -> Self {
Self {
length: Default::default(),
query: RawBytes::new(query),
}
}
/// Returns the raw query.
pub fn query_raw(&'a self) -> &'a [u8] {
self.query.as_bytes()
}
/// Returns query as a string (lossy converted).
pub fn query(&'a self) -> Cow<'a, str> {
self.query.as_str()
}
pub fn into_owned(self) -> RowsQueryEvent<'static> {
RowsQueryEvent {
length: self.length,
query: self.query.into_owned(),
}
}
}
impl<'de> MyDeserialize<'de> for RowsQueryEvent<'de> {
const SIZE: Option<usize> = None;
type Ctx = BinlogCtx<'de>;
fn deserialize(_ctx: Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Self> {
Ok(Self {
length: buf.parse(())?,
query: buf.parse(())?,
})
}
}
impl MySerialize for RowsQueryEvent<'_> {
fn serialize(&self, buf: &mut Vec<u8>) {
self.length.serialize(&mut *buf);
self.query.serialize(&mut *buf);
}
}
impl<'a> BinlogEvent<'a> for RowsQueryEvent<'a> {
const EVENT_TYPE: EventType = EventType::ROWS_QUERY_EVENT;
}
impl<'a> BinlogStruct<'a> for RowsQueryEvent<'a> {
fn len(&self, _version: BinlogVersion) -> usize {
let mut len = S(0);
len += S(1);
len += S(self.query.0.len());
min(len.0, u32::MAX as usize - BinlogEventHeader::LEN)
}
}