/
server.go
117 lines (94 loc) · 2.6 KB
/
server.go
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/*
Copyright 2021 The KubeEdge Authors.
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 ws
import (
"net/http"
"k8s.io/klog/v2"
"github.com/gorilla/websocket"
"github.com/adayangolzz/sedna-modified/pkg/globalmanager/messagelayer/model"
)
// Server defines websocket protocol server
type Server struct {
server *http.Server
}
// NewServer creates a websocket server
func NewServer(address string) *Server {
server := http.Server{
Addr: address,
}
wsServer := &Server{
server: &server,
}
http.HandleFunc("/", wsServer.ServeHTTP)
return wsServer
}
func (srv *Server) upgrade(w http.ResponseWriter, r *http.Request) *websocket.Conn {
upgrader := websocket.Upgrader{
ReadBufferSize: 1024,
WriteBufferSize: 1024,
}
conn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
return nil
}
return conn
}
func (srv *Server) ServeHTTP(w http.ResponseWriter, req *http.Request) {
nodeName := req.Header.Get("Node-Name")
wsConn := srv.upgrade(w, req)
if wsConn == nil {
klog.Errorf("failed to upgrade to websocket for node %s", nodeName)
return
}
// serve connection
nodeClient := &nodeClient{conn: wsConn, req: req}
go nodeClient.Serve()
}
// ListenAndServe listens and serves the server
func (srv *Server) ListenAndServe() error {
return srv.server.ListenAndServe()
}
// Close closes the server
func (srv *Server) Close() error {
if srv.server != nil {
return srv.server.Close()
}
return nil
}
type nodeClient struct {
conn *websocket.Conn
req *http.Request
nodeName string
}
func (nc *nodeClient) readOneMsg() (model.Message, error) {
var msg model.Message
err := nc.conn.ReadJSON(&msg)
if err != nil {
return msg, err
}
return msg, nil
}
func (nc *nodeClient) writeOneMsg(msg model.Message) error {
return nc.conn.WriteJSON(&msg)
}
func (nc *nodeClient) Serve() {
nodeName := nc.req.Header.Get("Node-Name")
nc.nodeName = nodeName
klog.Infof("established connection for node %s", nodeName)
// nc.conn.SetCloseHandler
closeCh := make(chan struct{}, 2)
AddNode(nodeName, nc.readOneMsg, nc.writeOneMsg, closeCh)
<-closeCh
klog.Infof("closed connection for node %s", nodeName)
_ = nc.conn.Close()
}