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autoincrement.go
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autoincrement.go
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/*
* Radon
*
* Copyright 2018-2019 The Radon Authors.
* Code is licensed under the GPLv3.
*
*/
package autoincrement
import (
"sync"
"time"
"router"
"github.com/xelabs/go-mysqlstack/sqlparser"
"github.com/xelabs/go-mysqlstack/xlog"
)
// AutoIncrement struct.
// Using Now().UnixNano as start seed seq.
type AutoIncrement struct {
mu sync.Mutex
log *xlog.Log
seq uint64
router *router.Router
}
// NewAutoIncrement -- creates new AutoIncrement.
func NewAutoIncrement(log *xlog.Log, router *router.Router) AutoIncrementHandler {
return &AutoIncrement{
log: log,
router: router,
}
}
// Init -- used to init the plug module.
func (autoinc *AutoIncrement) Init() error {
autoinc.seq = uint64(time.Now().UnixNano())
return nil
}
// Process -- process auto-increment.
// Append the auto-increment column&value to the end of the row if not exists.
func (autoinc *AutoIncrement) Process(database string, ins *sqlparser.Insert) error {
var seq uint64
router := autoinc.router
// Qualifier is database in the insert query, such as "db.t1".
if !ins.Table.Qualifier.IsEmpty() {
database = ins.Table.Qualifier.String()
}
table := ins.Table.Name.String()
tblInfo, err := router.TableConfig(database, table)
if err != nil {
return err
}
// Get seq(thread-safe).
autoinc.mu.Lock()
seq = autoinc.seq
switch rows := ins.Rows.(type) {
case sqlparser.Values:
autoinc.seq += uint64(len(rows))
}
autoinc.mu.Unlock()
if tblInfo.AutoIncrement != nil {
modifyForAutoinc(ins, tblInfo.AutoIncrement, seq)
}
return nil
}
// Close -- close the plugin.
func (autoinc *AutoIncrement) Close() error {
return nil
}