fix #235

@@ -2,6 +2,7 @@ package session
 
 
 import (
 import (
 	"errors"
 	"errors"
+	"fmt"
 	"io"
 	"io"
 	"io/ioutil"
 	"io/ioutil"
 	"os"
 	"os"
@@ -131,6 +132,18 @@ func (fp *FileProvider) SessionGC() {
 	filepath.Walk(fp.savePath, gcpath)
 	filepath.Walk(fp.savePath, gcpath)
 }
 }
 
 
+func (fp *FileProvider) SessionAll() int {
+	a := &activeSession{}
+	err := filepath.Walk(fp.savePath, func(path string, f os.FileInfo, err error) error {
+		return a.visit(path, f, err)
+	})
+	if err != nil {
+		fmt.Printf("filepath.Walk() returned %v\n", err)
+		return 0
+	}
+	return a.total
+}
+
 func (fp *FileProvider) SessionRegenerate(oldsid, sid string) (SessionStore, error) {
 func (fp *FileProvider) SessionRegenerate(oldsid, sid string) (SessionStore, error) {
 	err := os.MkdirAll(path.Join(fp.savePath, string(oldsid[0]), string(oldsid[1])), 0777)
 	err := os.MkdirAll(path.Join(fp.savePath, string(oldsid[0]), string(oldsid[1])), 0777)
 	if err != nil {
 	if err != nil {
@@ -193,6 +206,21 @@ func gcpath(path string, info os.FileInfo, err error) error {
 	return nil
 	return nil
 }
 }
 
 
+type activeSession struct {
+	total int
+}
+
+func (self *activeSession) visit(paths string, f os.FileInfo, err error) error {
+	if err != nil {
+		return err
+	}
+	if f.IsDir() {
+		return nil
+	}
+	self.total = self.total + 1
+	return nil
+}
+
 func init() {
 func init() {
 	Register("file", filepder)
 	Register("file", filepder)
 }
 }

@@ -142,6 +142,10 @@ func (pder *MemProvider) SessionGC() {
 	pder.lock.RUnlock()
 	pder.lock.RUnlock()
 }
 }
 
 
+func (pder *MemProvider) SessionAll() int {
+	return pder.list.Len()
+}
+
 func (pder *MemProvider) SessionUpdate(sid string) error {
 func (pder *MemProvider) SessionUpdate(sid string) error {
 	pder.lock.Lock()
 	pder.lock.Lock()
 	defer pder.lock.Unlock()
 	defer pder.lock.Unlock()

@@ -152,6 +152,17 @@ func (mp *MysqlProvider) SessionGC() {
 	return
 	return
 }
 }
 
 
+func (mp *MysqlProvider) SessionAll() int {
+	c := mp.connectInit()
+	defer c.Close()
+	var total int
+	err := c.QueryRow("SELECT count(*) as num from session").Scan(&total)
+	if err != nil {
+		return 0
+	}
+	return total
+}
+
 func init() {
 func init() {
 	Register("mysql", mysqlpder)
 	Register("mysql", mysqlpder)
 }
 }

@@ -128,6 +128,12 @@ func (rp *RedisProvider) SessionGC() {
 	return
 	return
 }
 }
 
 
+//@todo
+func (rp *RedisProvider) SessionAll() int {
+
+	return 0
+}
+
 func init() {
 func init() {
 	Register("redis", redispder)
 	Register("redis", redispder)
 }
 }

@@ -27,6 +27,7 @@ type Provider interface {
 	SessionRead(sid string) (SessionStore, error)
 	SessionRead(sid string) (SessionStore, error)
 	SessionRegenerate(oldsid, sid string) (SessionStore, error)
 	SessionRegenerate(oldsid, sid string) (SessionStore, error)
 	SessionDestroy(sid string) error
 	SessionDestroy(sid string) error
+	SessionAll() int //get all active session
 	SessionGC()
 	SessionGC()
 }
 }
 
 
@@ -195,6 +196,10 @@ func (manager *Manager) SessionRegenerateId(w http.ResponseWriter, r *http.Reque
 	return
 	return
 }
 }
 
 
+func (manager *Manager) GetActiveSession() int {
+	return manager.provider.SessionAll()
+}
+
 //remote_addr cruunixnano randdata
 //remote_addr cruunixnano randdata
 
 
 func (manager *Manager) sessionId(r *http.Request) (sid string) {
 func (manager *Manager) sessionId(r *http.Request) (sid string) {