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sess_mysql.go
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sess_mysql.go
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// Copyright 2014 beego Author. All Rights Reserved.
//
// 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 mysql for session provider
//
// depends on github.com/go-sql-driver/mysql:
//
// go install github.com/go-sql-driver/mysql
//
// mysql session support need create table as sql:
// CREATE TABLE `session` (
// `session_key` char(64) NOT NULL,
// `session_data` blob,
// `session_expiry` int(11) unsigned NOT NULL,
// PRIMARY KEY (`session_key`)
// ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
//
// Usage:
// import(
// _ "github.com/astaxie/beego/session/mysql"
// "github.com/astaxie/beego/session"
// )
//
// func init() {
// globalSessions, _ = session.NewManager("mysql", ``{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig":"[username[:password]@][protocol[(address)]]/dbname[?param1=value1&...¶mN=valueN]"}``)
// go globalSessions.GC()
// }
//
// more docs: http://beego.me/docs/module/session.md
package mysql
import (
"database/sql"
"net/http"
"sync"
"time"
"github.com/astaxie/beego/session"
// import mysql driver
_ "github.com/go-sql-driver/mysql"
)
var (
// TableName store the session in MySQL
TableName = "session"
mysqlpder = &Provider{}
)
// SessionStore mysql session store
type SessionStore struct {
c *sql.DB
sid string
lock sync.RWMutex
values map[interface{}]interface{}
}
// Set value in mysql session.
// it is temp value in map.
func (st *SessionStore) Set(key, value interface{}) error {
st.lock.Lock()
defer st.lock.Unlock()
st.values[key] = value
return nil
}
// Get value from mysql session
func (st *SessionStore) Get(key interface{}) interface{} {
st.lock.RLock()
defer st.lock.RUnlock()
if v, ok := st.values[key]; ok {
return v
}
return nil
}
// Delete value in mysql session
func (st *SessionStore) Delete(key interface{}) error {
st.lock.Lock()
defer st.lock.Unlock()
delete(st.values, key)
return nil
}
// Flush clear all values in mysql session
func (st *SessionStore) Flush() error {
st.lock.Lock()
defer st.lock.Unlock()
st.values = make(map[interface{}]interface{})
return nil
}
// SessionID get session id of this mysql session store
func (st *SessionStore) SessionID() string {
return st.sid
}
// SessionRelease save mysql session values to database.
// must call this method to save values to database.
func (st *SessionStore) SessionRelease(w http.ResponseWriter) {
defer st.c.Close()
b, err := session.EncodeGob(st.values)
if err != nil {
return
}
st.c.Exec("UPDATE "+TableName+" set `session_data`=?, `session_expiry`=? where session_key=?",
b, time.Now().Unix(), st.sid)
}
// Provider mysql session provider
type Provider struct {
maxlifetime int64
savePath string
}
// connect to mysql
func (mp *Provider) connectInit() *sql.DB {
db, e := sql.Open("mysql", mp.savePath)
if e != nil {
return nil
}
return db
}
// SessionInit init mysql session.
// savepath is the connection string of mysql.
func (mp *Provider) SessionInit(maxlifetime int64, savePath string) error {
mp.maxlifetime = maxlifetime
mp.savePath = savePath
return nil
}
// SessionRead get mysql session by sid
func (mp *Provider) SessionRead(sid string) (session.Store, error) {
c := mp.connectInit()
row := c.QueryRow("select session_data from "+TableName+" where session_key=?", sid)
var sessiondata []byte
err := row.Scan(&sessiondata)
if err == sql.ErrNoRows {
c.Exec("insert into "+TableName+"(`session_key`,`session_data`,`session_expiry`) values(?,?,?)",
sid, "", time.Now().Unix())
}
var kv map[interface{}]interface{}
if len(sessiondata) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(sessiondata)
if err != nil {
return nil, err
}
}
rs := &SessionStore{c: c, sid: sid, values: kv}
return rs, nil
}
// SessionExist check mysql session exist
func (mp *Provider) SessionExist(sid string) bool {
c := mp.connectInit()
defer c.Close()
row := c.QueryRow("select session_data from "+TableName+" where session_key=?", sid)
var sessiondata []byte
err := row.Scan(&sessiondata)
if err == sql.ErrNoRows {
return false
}
return true
}
// SessionRegenerate generate new sid for mysql session
func (mp *Provider) SessionRegenerate(oldsid, sid string) (session.Store, error) {
c := mp.connectInit()
row := c.QueryRow("select session_data from "+TableName+" where session_key=?", oldsid)
var sessiondata []byte
err := row.Scan(&sessiondata)
if err == sql.ErrNoRows {
c.Exec("insert into "+TableName+"(`session_key`,`session_data`,`session_expiry`) values(?,?,?)", oldsid, "", time.Now().Unix())
}
c.Exec("update "+TableName+" set `session_key`=? where session_key=?", sid, oldsid)
var kv map[interface{}]interface{}
if len(sessiondata) == 0 {
kv = make(map[interface{}]interface{})
} else {
kv, err = session.DecodeGob(sessiondata)
if err != nil {
return nil, err
}
}
rs := &SessionStore{c: c, sid: sid, values: kv}
return rs, nil
}
// SessionDestroy delete mysql session by sid
func (mp *Provider) SessionDestroy(sid string) error {
c := mp.connectInit()
c.Exec("DELETE FROM "+TableName+" where session_key=?", sid)
c.Close()
return nil
}
// SessionGC delete expired values in mysql session
func (mp *Provider) SessionGC() {
c := mp.connectInit()
c.Exec("DELETE from "+TableName+" where session_expiry < ?", time.Now().Unix()-mp.maxlifetime)
c.Close()
return
}
// SessionAll count values in mysql session
func (mp *Provider) SessionAll() int {
c := mp.connectInit()
defer c.Close()
var total int
err := c.QueryRow("SELECT count(*) as num from " + TableName).Scan(&total)
if err != nil {
return 0
}
return total
}
func init() {
session.Register("mysql", mysqlpder)
}