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persisted_session.go
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persisted_session.go
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// Copyright 2021 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package memory
import (
"github.com/gabereiser/go-mysql-server/sql"
)
type GlobalsMap = map[string]interface{}
type InMemoryPersistedSession struct {
sql.Session
persistedGlobals GlobalsMap
validateCallback func()
}
// NewInMemoryPersistedSession is a sql.PersistableSession that writes global variables to an im-memory map
func NewInMemoryPersistedSession(sess sql.Session, persistedGlobals GlobalsMap) *InMemoryPersistedSession {
return &InMemoryPersistedSession{Session: sess, persistedGlobals: persistedGlobals}
}
// NewInMemoryPersistedSessionWithValidationCallback is a sql.PersistableSession that defines increment function to count number of calls on ValidateSession().
func NewInMemoryPersistedSessionWithValidationCallback(sess sql.Session, validateCb func()) *InMemoryPersistedSession {
return &InMemoryPersistedSession{Session: sess, validateCallback: validateCb}
}
// PersistGlobal implements sql.PersistableSession
func (s *InMemoryPersistedSession) PersistGlobal(sysVarName string, value interface{}) error {
sysVar, _, ok := sql.SystemVariables.GetGlobal(sysVarName)
if !ok {
return sql.ErrUnknownSystemVariable.New(sysVarName)
}
val, err := sysVar.Type.Convert(value)
if err != nil {
return err
}
s.persistedGlobals[sysVarName] = val
return nil
}
// RemovePersistedGlobal implements sql.PersistableSession
func (s *InMemoryPersistedSession) RemovePersistedGlobal(sysVarName string) error {
if _, _, ok := sql.SystemVariables.GetGlobal(sysVarName); !ok {
return sql.ErrUnknownSystemVariable.New(sysVarName)
}
delete(s.persistedGlobals, sysVarName)
return nil
}
// RemoveAllPersistedGlobals implements sql.PersistableSession
func (s *InMemoryPersistedSession) RemoveAllPersistedGlobals() error {
s.persistedGlobals = GlobalsMap{}
return nil
}
// GetPersistedValue implements sql.PersistableSession
func (s *InMemoryPersistedSession) GetPersistedValue(k string) (interface{}, error) {
return s.persistedGlobals[k], nil
}
// ValidateSession counts the number of times this method is called.
func (s *InMemoryPersistedSession) ValidateSession(ctx *sql.Context, dbName string) error {
if s.validateCallback != nil {
s.validateCallback()
}
return s.Session.ValidateSession(ctx, dbName)
}