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// 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::io::{self};
use crate::{
binlog::{
consts::{BinlogVersion, EventType},
BinlogCtx, BinlogEvent, BinlogStruct,
},
io::ParseBuf,
misc::raw::{int::LeU64, RawInt},
proto::{MyDeserialize, MySerialize},
};
/// Rand event.
///
/// Logs random seed used by the next `RAND()`, and by `PASSWORD()` in 4.1.0. 4.1.1 does not need
/// it (it's repeatable again) so this event needn't be written in 4.1.1 for `PASSWORD()`
/// (but the fact that it is written is just a waste, it does not cause bugs).
///
/// The state of the random number generation consists of 128 bits, which are stored internally
/// as two 64-bit numbers.
#[derive(Debug, Clone, Eq, PartialEq, Hash)]
pub struct RandEvent {
pub seed1: RawInt<LeU64>,
pub seed2: RawInt<LeU64>,
}
impl<'de> MyDeserialize<'de> for RandEvent {
const SIZE: Option<usize> = Some(16);
type Ctx = BinlogCtx<'de>;
fn deserialize(_: Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Self> {
Ok(Self {
seed1: buf.parse_unchecked(())?,
seed2: buf.parse_unchecked(())?,
})
}
}
impl MySerialize for RandEvent {
fn serialize(&self, buf: &mut Vec<u8>) {
self.seed1.serialize(&mut *buf);
self.seed2.serialize(&mut *buf);
}
}
impl<'a> BinlogEvent<'a> for RandEvent {
const EVENT_TYPE: EventType = EventType::RAND_EVENT;
}
impl<'a> BinlogStruct<'a> for RandEvent {
fn len(&self, _version: BinlogVersion) -> usize {
8
}
}