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session.go
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session.go
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/*
* Copyright (C) 2018 The DNA Authors
* This file is part of The DNA library.
*
* The DNA is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The DNA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The DNA. If not, see <http://www.gnu.org/licenses/>.
*/
package session
import (
"errors"
"sync"
"time"
cfg "github.com/dnaproject2/DNA/common/config"
"github.com/gorilla/websocket"
"github.com/pborman/uuid"
)
type TxHashInfo struct {
TxHash string //transaction hash
StartTime int64 //recv tranasction time
}
//websocket session
type Session struct {
sync.Mutex
mConnection *websocket.Conn
nLastActive int64 //last active time
sessionId string //session id
TxHashArr []TxHashInfo //transaction hashes in this session
}
const SESSION_TIMEOUT int64 = 300
//create new session
func newSession(wsConn *websocket.Conn) *Session {
sessionid := uuid.NewUUID().String()
session := &Session{
mConnection: wsConn,
nLastActive: time.Now().Unix(),
sessionId: sessionid,
TxHashArr: []TxHashInfo{},
}
return session
}
func (self *Session) GetSessionId() string {
return self.sessionId
}
//close session
func (self *Session) Close() {
self.Lock()
defer self.Unlock()
if self.mConnection != nil {
self.mConnection.Close()
self.mConnection = nil
}
self.sessionId = ""
}
//update active time
func (self *Session) UpdateActiveTime() {
self.Lock()
defer self.Unlock()
self.nLastActive = time.Now().Unix()
}
//send to client
func (self *Session) Send(data []byte) error {
if len(data) == 0 {
return nil
}
self.Lock()
defer self.Unlock()
if self.mConnection == nil {
return errors.New("WebSocket is null")
}
return self.mConnection.WriteMessage(websocket.TextMessage, data)
}
//sesseion time over check
func (self *Session) SessionTimeoverCheck() bool {
nCurTime := time.Now().Unix()
if nCurTime-self.nLastActive > SESSION_TIMEOUT {
//sec
return true
}
return false
}
//remove timew over transaction hashes
func (self *Session) RemoveTimeoverTxHashes() (remove []TxHashInfo) {
self.Lock()
defer self.Unlock()
index := len(self.TxHashArr)
now := time.Now().Unix()
for k, v := range self.TxHashArr {
if (now - v.StartTime) < int64(cfg.DEFAULT_GEN_BLOCK_TIME*10) {
index = k
break
}
}
remove = self.TxHashArr[0:index]
self.TxHashArr = self.TxHashArr[index:]
return remove
}
//append transaction hash
func (self *Session) AppendTxHash(txhash string) {
self.Lock()
defer self.Unlock()
self.TxHashArr = append(self.TxHashArr, TxHashInfo{txhash, time.Now().Unix()})
}