250 lines
6.4 KiB
Go
250 lines
6.4 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package postgres for session provider
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//
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// depends on github.com/lib/pq:
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//
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// go install github.com/lib/pq
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//
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//
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// needs this table in your database:
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//
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// CREATE TABLE session (
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// session_key char(64) NOT NULL,
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// session_data bytea,
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// session_expiry timestamp NOT NULL,
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// CONSTRAINT session_key PRIMARY KEY(session_key)
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// );
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//
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// will be activated with these settings in app.conf:
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//
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// SessionOn = true
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// SessionProvider = postgresql
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// SessionSavePath = "user=a password=b dbname=c sslmode=disable"
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// SessionName = session
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//
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//
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// Usage:
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// import(
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// _ "github.com/astaxie/beego/session/postgresql"
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// "github.com/astaxie/beego/session"
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// )
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//
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// func init() {
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// globalSessions, _ = session.NewManager("postgresql", ``{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig":"user=pqgotest dbname=pqgotest sslmode=verify-full"}``)
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// go globalSessions.GC()
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// }
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//
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// more docs: http://beego.me/docs/module/session.md
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package postgres
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import (
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"database/sql"
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"net/http"
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"sync"
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"time"
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"github.com/astaxie/beego/pkg/session"
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// import postgresql Driver
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_ "github.com/lib/pq"
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)
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var postgresqlpder = &Provider{}
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// SessionStore postgresql session store
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type SessionStore struct {
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c *sql.DB
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sid string
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lock sync.RWMutex
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values map[interface{}]interface{}
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}
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// Set value in postgresql session.
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// it is temp value in map.
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func (st *SessionStore) Set(key, value interface{}) error {
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st.lock.Lock()
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defer st.lock.Unlock()
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st.values[key] = value
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return nil
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}
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// Get value from postgresql session
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func (st *SessionStore) Get(key interface{}) interface{} {
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st.lock.RLock()
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defer st.lock.RUnlock()
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if v, ok := st.values[key]; ok {
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return v
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}
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return nil
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}
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// Delete value in postgresql session
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func (st *SessionStore) Delete(key interface{}) error {
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st.lock.Lock()
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defer st.lock.Unlock()
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delete(st.values, key)
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return nil
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}
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// Flush clear all values in postgresql session
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func (st *SessionStore) Flush() error {
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st.lock.Lock()
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defer st.lock.Unlock()
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st.values = make(map[interface{}]interface{})
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return nil
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}
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// SessionID get session id of this postgresql session store
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func (st *SessionStore) SessionID() string {
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return st.sid
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}
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// SessionRelease save postgresql session values to database.
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// must call this method to save values to database.
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func (st *SessionStore) SessionRelease(w http.ResponseWriter) {
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defer st.c.Close()
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b, err := session.EncodeGob(st.values)
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if err != nil {
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return
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}
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st.c.Exec("UPDATE session set session_data=$1, session_expiry=$2 where session_key=$3",
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b, time.Now().Format(time.RFC3339), st.sid)
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}
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// Provider postgresql session provider
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type Provider struct {
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maxlifetime int64
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savePath string
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}
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// connect to postgresql
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func (mp *Provider) connectInit() *sql.DB {
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db, e := sql.Open("postgres", mp.savePath)
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if e != nil {
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return nil
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}
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return db
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}
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// SessionInit init postgresql session.
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// savepath is the connection string of postgresql.
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func (mp *Provider) SessionInit(maxlifetime int64, savePath string) error {
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mp.maxlifetime = maxlifetime
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mp.savePath = savePath
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return nil
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}
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// SessionRead get postgresql session by sid
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func (mp *Provider) SessionRead(sid string) (session.Store, error) {
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c := mp.connectInit()
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row := c.QueryRow("select session_data from session where session_key=$1", sid)
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var sessiondata []byte
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err := row.Scan(&sessiondata)
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if err == sql.ErrNoRows {
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_, err = c.Exec("insert into session(session_key,session_data,session_expiry) values($1,$2,$3)",
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sid, "", time.Now().Format(time.RFC3339))
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if err != nil {
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return nil, err
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}
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} else if err != nil {
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return nil, err
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}
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var kv map[interface{}]interface{}
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if len(sessiondata) == 0 {
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kv = make(map[interface{}]interface{})
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} else {
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kv, err = session.DecodeGob(sessiondata)
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if err != nil {
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return nil, err
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}
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}
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rs := &SessionStore{c: c, sid: sid, values: kv}
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return rs, nil
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}
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// SessionExist check postgresql session exist
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func (mp *Provider) SessionExist(sid string) (bool, error) {
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c := mp.connectInit()
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defer c.Close()
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row := c.QueryRow("select session_data from session where session_key=$1", sid)
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var sessiondata []byte
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err := row.Scan(&sessiondata)
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if err != nil {
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if err == sql.ErrNoRows {
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return false, nil
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}
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return false, err
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}
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return true, nil
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}
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// SessionRegenerate generate new sid for postgresql session
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func (mp *Provider) SessionRegenerate(oldsid, sid string) (session.Store, error) {
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c := mp.connectInit()
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row := c.QueryRow("select session_data from session where session_key=$1", oldsid)
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var sessiondata []byte
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err := row.Scan(&sessiondata)
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if err == sql.ErrNoRows {
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c.Exec("insert into session(session_key,session_data,session_expiry) values($1,$2,$3)",
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oldsid, "", time.Now().Format(time.RFC3339))
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}
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c.Exec("update session set session_key=$1 where session_key=$2", sid, oldsid)
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var kv map[interface{}]interface{}
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if len(sessiondata) == 0 {
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kv = make(map[interface{}]interface{})
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} else {
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kv, err = session.DecodeGob(sessiondata)
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if err != nil {
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return nil, err
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}
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}
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rs := &SessionStore{c: c, sid: sid, values: kv}
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return rs, nil
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}
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// SessionDestroy delete postgresql session by sid
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func (mp *Provider) SessionDestroy(sid string) error {
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c := mp.connectInit()
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c.Exec("DELETE FROM session where session_key=$1", sid)
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c.Close()
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return nil
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}
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// SessionGC delete expired values in postgresql session
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func (mp *Provider) SessionGC() {
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c := mp.connectInit()
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c.Exec("DELETE from session where EXTRACT(EPOCH FROM (current_timestamp - session_expiry)) > $1", mp.maxlifetime)
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c.Close()
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}
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// SessionAll count values in postgresql session
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func (mp *Provider) SessionAll() int {
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c := mp.connectInit()
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defer c.Close()
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var total int
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err := c.QueryRow("SELECT count(*) as num from session").Scan(&total)
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if err != nil {
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return 0
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}
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return total
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}
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func init() {
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session.Register("postgresql", postgresqlpder)
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}
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