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server.go
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server.go
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package websocket
import (
"context"
"crypto/tls"
"encoding/json"
"errors"
"net"
"net/http"
"net/url"
"strings"
"time"
"github.com/go-kratos/kratos/v2/encoding"
"github.com/go-kratos/kratos/v2/transport"
ws "github.com/gorilla/websocket"
"github.com/tx7do/kratos-transport/broker"
)
type Binder func() Any
type ConnectHandler func(SessionID, bool)
type MessageHandler func(SessionID, MessagePayload) error
type HandlerData struct {
Handler MessageHandler
Binder Binder
}
type MessageHandlerMap map[MessageType]*HandlerData
var (
_ transport.Server = (*Server)(nil)
_ transport.Endpointer = (*Server)(nil)
)
type Server struct {
*http.Server
lis net.Listener
tlsConf *tls.Config
upgrader *ws.Upgrader
network string
address string
path string
strictSlash bool
timeout time.Duration
err error
codec encoding.Codec
messageHandlers MessageHandlerMap
sessionMgr *SessionManager
register chan *Session
unregister chan *Session
payloadType PayloadType
}
func NewServer(opts ...ServerOption) *Server {
srv := &Server{
network: "tcp",
address: ":0",
timeout: 1 * time.Second,
strictSlash: true,
path: "/",
messageHandlers: make(MessageHandlerMap),
sessionMgr: NewSessionManager(),
upgrader: &ws.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
CheckOrigin: func(r *http.Request) bool { return true },
},
register: make(chan *Session),
unregister: make(chan *Session),
payloadType: PayloadTypeBinary,
}
srv.init(opts...)
srv.err = srv.listen()
return srv
}
func (s *Server) Name() string {
return string(KindWebsocket)
}
func (s *Server) init(opts ...ServerOption) {
for _, o := range opts {
o(s)
}
s.Server = &http.Server{
TLSConfig: s.tlsConf,
}
http.HandleFunc(s.path, s.wsHandler)
}
func (s *Server) SessionCount() int {
return s.sessionMgr.Count()
}
func (s *Server) RegisterMessageHandler(messageType MessageType, handler MessageHandler, binder Binder) {
if _, ok := s.messageHandlers[messageType]; ok {
return
}
s.messageHandlers[messageType] = &HandlerData{
handler, binder,
}
}
func RegisterServerMessageHandler[T any](srv *Server, messageType MessageType, handler func(SessionID, *T) error) {
srv.RegisterMessageHandler(messageType,
func(sessionId SessionID, payload MessagePayload) error {
switch t := payload.(type) {
case *T:
return handler(sessionId, t)
default:
LogError("invalid payload struct type:", t)
return errors.New("invalid payload struct type")
}
},
func() Any {
var t T
return &t
},
)
}
func (s *Server) DeregisterMessageHandler(messageType MessageType) {
delete(s.messageHandlers, messageType)
}
func (s *Server) marshalMessage(messageType MessageType, message MessagePayload) ([]byte, error) {
var err error
var buff []byte
switch s.payloadType {
case PayloadTypeBinary:
var msg BinaryMessage
msg.Type = messageType
msg.Body, err = broker.Marshal(s.codec, message)
if err != nil {
return nil, err
}
buff, err = msg.Marshal()
if err != nil {
return nil, err
}
break
case PayloadTypeText:
var buf []byte
var msg TextMessage
msg.Type = messageType
buf, err = broker.Marshal(s.codec, message)
msg.Body = string(buf)
if err != nil {
return nil, err
}
buff, err = json.Marshal(msg)
if err != nil {
return nil, err
}
break
}
//LogInfo("marshalMessage:", string(buff))
return buff, nil
}
func (s *Server) SendMessage(sessionId SessionID, messageType MessageType, message MessagePayload) {
c, ok := s.sessionMgr.Get(sessionId)
if !ok {
LogError("session not found:", sessionId)
return
}
switch s.payloadType {
case PayloadTypeBinary:
buf, err := s.marshalMessage(messageType, message)
if err != nil {
LogError("marshal message exception:", err)
return
}
c.SendMessage(buf)
break
case PayloadTypeText:
buf, err := s.codec.Marshal(message)
if err != nil {
LogError("marshal message exception:", err)
return
}
c.SendMessage(buf)
break
}
}
func (s *Server) Broadcast(messageType MessageType, message MessagePayload) {
buf, err := s.marshalMessage(messageType, message)
if err != nil {
LogError(" marshal message exception:", err)
return
}
s.sessionMgr.Range(func(session *Session) {
session.SendMessage(buf)
})
}
func (s *Server) unmarshalMessage(buf []byte) (*HandlerData, MessagePayload, error) {
var handler *HandlerData
var payload MessagePayload
switch s.payloadType {
case PayloadTypeBinary:
var msg BinaryMessage
if err := msg.Unmarshal(buf); err != nil {
LogErrorf("decode message exception: %s", err)
return nil, nil, err
}
var ok bool
handler, ok = s.messageHandlers[msg.Type]
if !ok {
LogError("message handler not found:", msg.Type)
return nil, nil, errors.New("message handler not found")
}
if handler.Binder != nil {
payload = handler.Binder()
} else {
payload = msg.Body
}
if err := broker.Unmarshal(s.codec, msg.Body, &payload); err != nil {
LogErrorf("unmarshal message exception: %s", err)
return nil, nil, err
}
//LogDebug(string(msg.Body))
case PayloadTypeText:
var msg TextMessage
if err := msg.Unmarshal(buf); err != nil {
LogErrorf("decode message exception: %s", err)
return nil, nil, err
}
var ok bool
handler, ok = s.messageHandlers[msg.Type]
if !ok {
LogError("message handler not found:", msg.Type)
return nil, nil, errors.New("message handler not found")
}
if handler.Binder != nil {
payload = handler.Binder()
} else {
payload = msg.Body
}
if err := broker.Unmarshal(s.codec, []byte(msg.Body), &payload); err != nil {
LogErrorf("unmarshal message exception: %s", err)
return nil, nil, err
}
//LogDebug(string(msg.Body))
}
return handler, payload, nil
}
func (s *Server) messageHandler(sessionId SessionID, buf []byte) error {
var err error
var handler *HandlerData
var payload MessagePayload
if handler, payload, err = s.unmarshalMessage(buf); err != nil {
LogErrorf("unmarshal message failed: %s", err)
return err
}
//LogDebug(payload)
if err = handler.Handler(sessionId, payload); err != nil {
LogErrorf("message handler failed: %s", err)
return err
}
return nil
}
func (s *Server) wsHandler(res http.ResponseWriter, req *http.Request) {
conn, err := s.upgrader.Upgrade(res, req, nil)
if err != nil {
LogError("upgrade exception:", err)
return
}
session := NewSession(conn, s)
session.server.register <- session
session.Listen()
}
func (s *Server) listen() error {
if s.lis == nil {
lis, err := net.Listen(s.network, s.address)
if err != nil {
s.err = err
return err
}
s.lis = lis
}
return nil
}
func (s *Server) Endpoint() (*url.URL, error) {
addr := s.address
prefix := "ws://"
if s.tlsConf == nil {
if !strings.HasPrefix(addr, "ws://") {
prefix = "ws://"
}
} else {
if !strings.HasPrefix(addr, "wss://") {
prefix = "wss://"
}
}
addr = prefix + addr
var endpoint *url.URL
endpoint, s.err = url.Parse(addr)
return endpoint, nil
}
func (s *Server) run() {
for {
select {
case client := <-s.register:
s.sessionMgr.Add(client)
case client := <-s.unregister:
s.sessionMgr.Remove(client)
}
}
}
func (s *Server) Start(ctx context.Context) error {
if s.err != nil {
return s.err
}
s.BaseContext = func(net.Listener) context.Context {
return ctx
}
LogInfof("server listening on: %s", s.lis.Addr().String())
go s.run()
var err error
if s.tlsConf != nil {
err = s.ServeTLS(s.lis, "", "")
} else {
err = s.Serve(s.lis)
}
if !errors.Is(err, http.ErrServerClosed) {
return err
}
return nil
}
func (s *Server) Stop(ctx context.Context) error {
LogInfo("server stopping")
return s.Shutdown(ctx)
}