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server.go
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server.go
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package jtt808
import (
"crypto/rsa"
"errors"
"fmt"
"net"
"runtime/debug"
"strconv"
"sync"
"github.com/flash520/link"
log "github.com/sirupsen/logrus"
"github.com/flash520/jtt808/protocol"
)
// Options 服务器选项
type Options struct {
Keepalive int64
AutoMergePacket bool
CloseHandler func(*Session)
PrivateKey *rsa.PrivateKey
}
// Server 协议服务器
type Server struct {
server *link.Server
handler sessionHandler
timer *CountdownTimer
privateKey *rsa.PrivateKey
mutex sync.Mutex
sessions map[uint64]*Session
closeHandler func(*Session)
messageHandlers sync.Map
}
type MessageHandler func(*Session, *protocol.Message)
// NewServer 创建服务
func NewServer(options Options) (*Server, error) {
if options.Keepalive <= 0 {
options.Keepalive = 60
}
if options.PrivateKey != nil && options.PrivateKey.Size() != 128 {
return nil, errors.New("RSA key must be 1024 bits")
}
server := Server{
closeHandler: options.CloseHandler,
sessions: make(map[uint64]*Session),
privateKey: options.PrivateKey,
}
server.handler.server = &server
server.handler.autoMergePacket = options.AutoMergePacket
server.timer = NewCountdownTimer(options.Keepalive, server.handleReadTimeout)
return &server, nil
}
// Run 运行服务
func (server *Server) Run(network string, port int) error {
if server.server != nil {
return errors.New("server already running")
}
address := fmt.Sprintf("0.0.0.0:%d", port)
listen, err := net.Listen(network, address)
if err != nil {
return err
}
p := Protocol{
privateKey: server.privateKey,
}
server.server = link.NewServer(listen, &p, 24, server.handler)
log.Infof("[JT/T 808] protocol server started on %s", address)
return server.server.Serve()
}
// Stop 停止服务
func (server *Server) Stop() {
if server.server != nil {
server.server.Stop()
server.server = nil
}
}
// GetSession 获取Session
func (server *Server) GetSession(id uint64) (*Session, bool) {
server.mutex.Lock()
defer server.mutex.Unlock()
session, ok := server.sessions[id]
if !ok {
return nil, false
}
return session, true
}
// GetPrivateKey 获取平台私钥
func (server *Server) GetPrivateKey() *rsa.PrivateKey {
return server.privateKey
}
// Broadcast 广播消息
func (server *Server) Broadcast(entity protocol.Entity) int {
server.mutex.Lock()
sessions := make([]*Session, 0, len(server.sessions))
for _, session := range server.sessions {
sessions = append(sessions, session)
}
server.mutex.Unlock()
count := 0
for _, session := range sessions {
if _, err := session.Send(entity); err == nil {
count++
}
}
return count
}
// AddHandler 添加消息处理
func (server *Server) AddHandler(msgID protocol.MsgID, handler MessageHandler) {
if handler != nil {
server.messageHandlers.Store(msgID, handler)
}
}
// handleClose 处理关闭
func (server *Server) handleClose(session *Session) {
server.mutex.Lock()
delete(server.sessions, session.ID())
server.mutex.Unlock()
server.timer.Remove(strconv.FormatUint(session.ID(), 10))
if server.closeHandler != nil {
func() {
defer func() {
if err := recover(); err != nil {
debug.PrintStack()
}
}()
server.closeHandler(session)
}()
}
log.WithFields(log.Fields{
"id": session.ID(),
}).Debug("[JT/T 808] session closed")
}
// handleReadTimeout 处理读超时
func (server *Server) handleReadTimeout(key string) {
sessionID, err := strconv.ParseUint(key, 10, 64)
if err != nil {
return
}
session, ok := server.GetSession(sessionID)
if !ok {
return
}
session.Close()
log.WithFields(log.Fields{
"id": sessionID,
}).Debug("[JT/T 808] session read timeout")
}
// dispatchMessage 分派消息
func (server *Server) dispatchMessage(session *Session, message *protocol.Message) {
log.WithFields(log.Fields{
"id": fmt.Sprintf("0x%x", message.Header.MsgID),
}).Debug("[JT/T 808] dispatch message")
handler, ok := server.messageHandlers.Load(message.Header.MsgID)
if !ok {
log.WithFields(log.Fields{
"id": fmt.Sprintf("0x%x", message.Header.MsgID),
}).Info("[JT/T 808] dispatch message canceled, handler not found")
return
}
defer func() {
if err := recover(); err != nil {
debug.PrintStack()
}
}()
server.timer.Update(strconv.FormatUint(session.ID(), 10))
handler.(MessageHandler)(session, message)
}