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main.go
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main.go
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package main
import (
"context"
"fmt"
"github.com/emicklei/go-restful/v3"
"github.com/gorilla/websocket"
"io"
"log"
"net"
"net/http"
"os"
"regexp"
)
type Streamer struct {
dialer func() (net.Conn, error)
streamToServer func(clientConn *websocket.Conn, serverConn net.Conn, result chan<- error)
streamToClient func(clientConn *websocket.Conn, serverConn net.Conn, result chan<- error)
}
const (
localhostIP = "0.0.0.0"
serverPort = 8080
vncEndpoint = "/vnc"
baseFolder = "/var/run/kubevirt-private"
apiVersion = "/v1"
)
func main() {
log.Print("KubeVirt VNC sidecar starting...")
_ = createRestfulWebService()
server := createHTTPServer(localhostIP, serverPort)
errors := make(chan error)
go func() {
errors <- server.ListenAndServe()
}()
// wait for server to exit
_ = <-errors
}
func createHTTPServer(ip string, port int) *http.Server {
return &http.Server{
Addr: fmt.Sprintf("%s:%d", ip, port),
}
}
func createRestfulWebService() *restful.WebService {
ws := new(restful.WebService)
ws.Doc(fmt.Sprintf("KubeVirt VNC proxy \"%s\" API.", apiVersion))
ws.Path(apiVersion)
ws.Route(ws.GET(vncEndpoint).
To(vncRequestHandler).
Operation(apiVersion + "VNC").
Doc("Open a websocket connection to connect to VNC."))
restful.Add(ws)
return ws
}
type ResponseContent struct {
Message string `json:"message"`
}
func vncRequestHandler(request *restful.Request, response *restful.Response) {
log.Print("Inbound VNC Request: ", request.Request.URL.Path)
//streamer := newRawStreamer()
//err := streamer.Handle(request, response)
//if err != nil {
// log.Fatal("Failed to handle request: ", err)
// return
//}
var content ResponseContent
content.Message = "123"
_ = response.WriteJson(content, "application/json")
}
func (s *Streamer) Handle(request *restful.Request, response *restful.Response) error {
serverConn, statusErr := s.dialer()
if statusErr != nil {
return statusErr
}
upgrader := &websocket.Upgrader{
ReadBufferSize: 10240,
WriteBufferSize: 10240,
CheckOrigin: func(_ *http.Request) bool {
return true
},
Subprotocols: []string{"plain.kubevirt.io"},
}
clientConn, err := upgrader.Upgrade(response, request.Request, nil)
if err != nil {
return err
}
ctx, cancel := context.WithCancel(request.Request.Context())
defer cancel()
go func(ctx context.Context, clientConn *websocket.Conn, serverConn net.Conn) {
<-ctx.Done()
_ = serverConn.Close()
_ = clientConn.Close()
}(ctx, clientConn, serverConn)
results := make(chan error, 2)
defer close(results)
go s.streamToClient(clientConn, serverConn, results)
go s.streamToServer(clientConn, serverConn, results)
result1 := <-results
// start canceling on the first result to force all goroutines to terminate
cancel()
result2 := <-results
if result1 != nil {
return result1
}
return result2
}
func newRawStreamer() *Streamer {
return &Streamer{
dialer: func() (net.Conn, error) {
uuid, err := resolveUUIDFolder()
if err != nil {
return nil, fmt.Errorf("error resolving UUID folder: %v", err)
}
socketPath := fmt.Sprintf("%s/%s/virt-vnc", baseFolder, uuid)
return net.Dial("unix", socketPath)
},
streamToServer: func(clientConn *websocket.Conn,
serverConn net.Conn, result chan<- error) {
_, err := io.Copy(serverConn, clientConn.NetConn())
result <- err
},
streamToClient: func(clientConn *websocket.Conn, serverConn net.Conn, result chan<- error) {
_, err := io.Copy(clientConn.NetConn(), serverConn)
result <- err
},
}
}
func resolveUUIDFolder() (string, error) {
files, err := os.ReadDir(baseFolder)
if err != nil {
return "", fmt.Errorf("error reading 'kubevirt-private' folder: %v", err)
}
pattern := "\\w{8}-\\w{4}-\\w{4}-\\w{4}-\\w{12}"
r := regexp.MustCompile(pattern)
for _, f := range files {
if f.IsDir() && r.MatchString(f.Name()) {
return f.Name(), nil
}
}
return "", fmt.Errorf("could not find UUID directory")
}