/
shell.go
129 lines (115 loc) · 2.43 KB
/
shell.go
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package main
import (
"context"
"fmt"
"net/http"
"time"
"github.com/criyle/go-judger-demo/pb"
"github.com/gin-gonic/gin"
"github.com/gorilla/websocket"
"go.uber.org/zap"
)
type shellHandle struct {
client pb.DemoBackendClient
logger *zap.Logger
}
func (s *shellHandle) Register(r *gin.RouterGroup) {
r.GET("/shell", s.wsShell)
}
func (s *shellHandle) wsShell(c *gin.Context) {
conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
if err != nil {
c.AbortWithError(http.StatusBadRequest, err)
return
}
ctx, cancel := context.WithCancel(c)
sc, err := s.client.Shell(ctx)
if err != nil {
conn.WriteMessage(websocket.TextMessage, []byte(fmt.Sprintf("shell error: %v", err)))
conn.WriteMessage(websocket.CloseMessage, nil)
conn.Close()
cancel()
return
}
sh := &shell{
conn: conn,
sc: sc,
cancel: cancel,
msg: make(chan *pb.ShellOutput, 16),
logger: s.logger,
}
go sh.readLoop()
go sh.recvLoop()
go sh.writeLoop()
}
type shell struct {
conn *websocket.Conn
sc pb.DemoBackend_ShellClient
cancel context.CancelFunc
msg chan *pb.ShellOutput
logger *zap.Logger
}
func (s *shell) readLoop() {
defer s.cancel()
defer s.conn.Close()
defer s.logger.Sugar().Debug("wsread exit")
s.conn.SetReadDeadline(time.Now().Add(pongWait))
s.conn.SetPongHandler(func(string) error {
s.conn.SetReadDeadline(time.Now().Add(pongWait))
return nil
})
for {
_, msg, err := s.conn.ReadMessage()
if err != nil {
break
}
err = s.sc.Send(&pb.ShellInput{
Request: &pb.ShellInput_Input{
Input: &pb.Input{
Content: msg,
},
},
})
if err != nil {
break
}
}
}
func (s *shell) writeLoop() {
defer s.cancel()
defer s.conn.Close()
defer s.logger.Sugar().Debug("wswrite exit")
ticker := time.NewTicker(pingPeriod)
defer ticker.Stop()
for {
select {
case <-ticker.C:
s.conn.SetWriteDeadline(time.Now().Add(writeWait))
if err := s.conn.WriteMessage(websocket.PingMessage, nil); err != nil {
return
}
case msg, ok := <-s.msg:
s.conn.SetWriteDeadline(time.Now().Add(writeWait))
if !ok {
s.conn.WriteMessage(websocket.CloseMessage, nil)
return
}
err := s.conn.WriteMessage(websocket.BinaryMessage, msg.GetContent())
if err != nil {
return
}
}
}
}
func (s *shell) recvLoop() {
defer s.cancel()
defer close(s.msg)
defer s.logger.Sugar().Debug("recv exit")
for {
msg, err := s.sc.Recv()
if err != nil {
return
}
s.msg <- msg
}
}