Merge pull request #4173 from AllenX2018/fix-bug-queryRow

Fix issue 3866

pkg/infrastructure/session/memcache/sess_memcache.go

@@ -0,0 +1,230 @@
+// 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 memcache for session provider
+//
+// depend on github.com/bradfitz/gomemcache/memcache
+//
+// go install github.com/bradfitz/gomemcache/memcache
+//
+// Usage:
+// import(
+//   _ "github.com/astaxie/beego/session/memcache"
+//   "github.com/astaxie/beego/session"
+// )
+//
+//	func init() {
+//		globalSessions, _ = session.NewManager("memcache", ``{"cookieName":"gosessionid","gclifetime":3600,"ProviderConfig":"127.0.0.1:11211"}``)
+//		go globalSessions.GC()
+//	}
+//
+// more docs: http://beego.me/docs/module/session.md
+package memcache
+
+import (
+	"net/http"
+	"strings"
+	"sync"
+
+	"github.com/astaxie/beego/pkg/infrastructure/session"
+
+	"github.com/bradfitz/gomemcache/memcache"
+)
+
+var mempder = &MemProvider{}
+var client *memcache.Client
+
+// SessionStore memcache session store
+type SessionStore struct {
+	sid         string
+	lock        sync.RWMutex
+	values      map[interface{}]interface{}
+	maxlifetime int64
+}
+
+// Set value in memcache session
+func (rs *SessionStore) Set(key, value interface{}) error {
+	rs.lock.Lock()
+	defer rs.lock.Unlock()
+	rs.values[key] = value
+	return nil
+}
+
+// Get value in memcache session
+func (rs *SessionStore) Get(key interface{}) interface{} {
+	rs.lock.RLock()
+	defer rs.lock.RUnlock()
+	if v, ok := rs.values[key]; ok {
+		return v
+	}
+	return nil
+}
+
+// Delete value in memcache session
+func (rs *SessionStore) Delete(key interface{}) error {
+	rs.lock.Lock()
+	defer rs.lock.Unlock()
+	delete(rs.values, key)
+	return nil
+}
+
+// Flush clear all values in memcache session
+func (rs *SessionStore) Flush() error {
+	rs.lock.Lock()
+	defer rs.lock.Unlock()
+	rs.values = make(map[interface{}]interface{})
+	return nil
+}
+
+// SessionID get memcache session id
+func (rs *SessionStore) SessionID() string {
+	return rs.sid
+}
+
+// SessionRelease save session values to memcache
+func (rs *SessionStore) SessionRelease(w http.ResponseWriter) {
+	b, err := session.EncodeGob(rs.values)
+	if err != nil {
+		return
+	}
+	item := memcache.Item{Key: rs.sid, Value: b, Expiration: int32(rs.maxlifetime)}
+	client.Set(&item)
+}
+
+// MemProvider memcache session provider
+type MemProvider struct {
+	maxlifetime int64
+	conninfo    []string
+	poolsize    int
+	password    string
+}
+
+// SessionInit init memcache session
+// savepath like
+// e.g. 127.0.0.1:9090
+func (rp *MemProvider) SessionInit(maxlifetime int64, savePath string) error {
+	rp.maxlifetime = maxlifetime
+	rp.conninfo = strings.Split(savePath, ";")
+	client = memcache.New(rp.conninfo...)
+	return nil
+}
+
+// SessionRead read memcache session by sid
+func (rp *MemProvider) SessionRead(sid string) (session.Store, error) {
+	if client == nil {
+		if err := rp.connectInit(); err != nil {
+			return nil, err
+		}
+	}
+	item, err := client.Get(sid)
+	if err != nil {
+		if err == memcache.ErrCacheMiss {
+			rs := &SessionStore{sid: sid, values: make(map[interface{}]interface{}), maxlifetime: rp.maxlifetime}
+			return rs, nil
+		}
+		return nil, err
+	}
+	var kv map[interface{}]interface{}
+	if len(item.Value) == 0 {
+		kv = make(map[interface{}]interface{})
+	} else {
+		kv, err = session.DecodeGob(item.Value)
+		if err != nil {
+			return nil, err
+		}
+	}
+	rs := &SessionStore{sid: sid, values: kv, maxlifetime: rp.maxlifetime}
+	return rs, nil
+}
+
+// SessionExist check memcache session exist by sid
+func (rp *MemProvider) SessionExist(sid string) (bool, error) {
+	if client == nil {
+		if err := rp.connectInit(); err != nil {
+			return false, err
+		}
+	}
+	if item, err := client.Get(sid); err != nil || len(item.Value) == 0 {
+		return false, err
+	}
+	return true, nil
+}
+
+// SessionRegenerate generate new sid for memcache session
+func (rp *MemProvider) SessionRegenerate(oldsid, sid string) (session.Store, error) {
+	if client == nil {
+		if err := rp.connectInit(); err != nil {
+			return nil, err
+		}
+	}
+	var contain []byte
+	if item, err := client.Get(sid); err != nil || len(item.Value) == 0 {
+		// oldsid doesn't exists, set the new sid directly
+		// ignore error here, since if it return error
+		// the existed value will be 0
+		item.Key = sid
+		item.Value = []byte("")
+		item.Expiration = int32(rp.maxlifetime)
+		client.Set(item)
+	} else {
+		client.Delete(oldsid)
+		item.Key = sid
+		item.Expiration = int32(rp.maxlifetime)
+		client.Set(item)
+		contain = item.Value
+	}
+
+	var kv map[interface{}]interface{}
+	if len(contain) == 0 {
+		kv = make(map[interface{}]interface{})
+	} else {
+		var err error
+		kv, err = session.DecodeGob(contain)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	rs := &SessionStore{sid: sid, values: kv, maxlifetime: rp.maxlifetime}
+	return rs, nil
+}
+
+// SessionDestroy delete memcache session by id
+func (rp *MemProvider) SessionDestroy(sid string) error {
+	if client == nil {
+		if err := rp.connectInit(); err != nil {
+			return err
+		}
+	}
+
+	return client.Delete(sid)
+}
+
+func (rp *MemProvider) connectInit() error {
+	client = memcache.New(rp.conninfo...)
+	return nil
+}
+
+// SessionGC Impelment method, no used.
+func (rp *MemProvider) SessionGC() {
+}
+
+// SessionAll return all activeSession
+func (rp *MemProvider) SessionAll() int {
+	return 0
+}
+
+func init() {
+	session.Register("memcache", mempder)
+}