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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;
use crate::{
binlog::{
consts::{BinlogVersion, EventType, IntvarEventType},
BinlogCtx, BinlogEvent, BinlogStruct,
},
io::ParseBuf,
misc::raw::{int::*, Const},
proto::{MyDeserialize, MySerialize},
};
/// Integer based session-variables event.
///
/// Written every time a statement uses an AUTO_INCREMENT column or the LAST_INSERT_ID() function;
/// precedes other events for the statement. This is written only before a QUERY_EVENT
/// and is not used with row-based logging. An INTVAR_EVENT is written with a "subtype"
/// in the event data part.
#[derive(Debug, Clone, Eq, PartialEq, Hash)]
pub struct IntvarEvent {
/// One byte identifying the type of variable stored.
subtype: Const<IntvarEventType, u8>,
/// The value of the variable.
value: RawInt<LeU64>,
}
impl IntvarEvent {
/// Creates a new instance.
pub fn new(subtype: IntvarEventType, value: u64) -> Self {
Self {
subtype: Const::new(subtype),
value: RawInt::new(value),
}
}
/// Returns the `subtype` value.
///
/// `subtype` is a one byte identifying the type of variable stored.
pub fn subtype(&self) -> IntvarEventType {
self.subtype.0
}
/// Returns the `value` value.
///
/// `value` is the value of the variable.
pub fn value(&self) -> u64 {
self.value.0
}
/// Sets the `subtype` value.
pub fn with_subtype(mut self, subtype: IntvarEventType) -> Self {
self.subtype = Const::new(subtype);
self
}
/// Sets the `value` value.
pub fn with_value(mut self, value: u64) -> Self {
self.value = RawInt::new(value);
self
}
}
impl<'de> MyDeserialize<'de> for IntvarEvent {
const SIZE: Option<usize> = Some(9);
type Ctx = BinlogCtx<'de>;
fn deserialize(_ctx: Self::Ctx, buf: &mut ParseBuf<'de>) -> io::Result<Self> {
Ok(Self {
subtype: buf.parse_unchecked(())?,
value: buf.parse_unchecked(())?,
})
}
}
impl MySerialize for IntvarEvent {
fn serialize(&self, buf: &mut Vec<u8>) {
self.subtype.serialize(&mut *buf);
self.value.serialize(&mut *buf);
}
}
impl<'a> BinlogEvent<'a> for IntvarEvent {
const EVENT_TYPE: EventType = EventType::INTVAR_EVENT;
}
impl<'a> BinlogStruct<'a> for IntvarEvent {
fn len(&self, _version: BinlogVersion) -> usize {
9
}
}