mirror of
https://github.com/criyle/go-judge.git
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211 lines
4.5 KiB
Go
211 lines
4.5 KiB
Go
package wsexecutor
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import (
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"context"
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"fmt"
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"net/http"
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"sync"
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"time"
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"github.com/criyle/go-judge/cmd/executorserver/model"
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"github.com/criyle/go-judge/worker"
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"github.com/gin-gonic/gin"
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"github.com/gorilla/websocket"
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"go.uber.org/zap"
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)
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// Register registers web socket handle /ws
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type Register interface {
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Register(*gin.Engine)
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}
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// New creates new websocket handle
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func New(worker worker.Worker, srcPrefix string, logger *zap.Logger) Register {
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return &wsHandle{
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worker: worker,
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srcPrefix: srcPrefix,
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logger: logger,
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}
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}
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var upgrader = websocket.Upgrader{
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CheckOrigin: func(r *http.Request) bool {
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return true
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},
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}
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const (
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writeWait = 10 * time.Second
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pongWait = 60 * time.Second
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pingPeriod = 50 * time.Second
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)
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type wsHandle struct {
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worker worker.Worker
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srcPrefix string
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logger *zap.Logger
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}
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type wsRequest struct {
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model.Request
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CancelRequestId string `json:"cancelRequestId"`
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}
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func (h *wsHandle) Register(r *gin.Engine) {
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r.GET("/ws", h.handleWS)
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}
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func (h *wsHandle) handleWS(c *gin.Context) {
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conn, err := upgrader.Upgrade(c.Writer, c.Request, nil)
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if err != nil {
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c.Error(err)
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c.AbortWithStatusJSON(http.StatusBadRequest, err.Error())
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return
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}
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resultCh := make(chan model.Response, 128)
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cm := newContextMap()
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handleRequest := func(baseCtx context.Context, req *wsRequest) error {
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if req.CancelRequestId != "" {
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h.logger.Sugar().Debugf("ws cancel: %s", req.CancelRequestId)
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cm.Remove(req.CancelRequestId)
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return nil
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}
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r, err := model.ConvertRequest(&req.Request, h.srcPrefix)
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if err != nil {
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return fmt.Errorf("ws convert error: %v", err)
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}
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ctx, cancel := context.WithCancel(baseCtx)
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if err := cm.Add(r.RequestID, cancel); err != nil {
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select {
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case <-baseCtx.Done():
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case resultCh <- model.Response{
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RequestID: req.RequestID,
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ErrorMsg: err.Error(),
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}:
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}
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cancel()
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h.logger.Sugar().Debugf("ws request error: %v", err)
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return nil
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}
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go func() {
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defer cm.Remove(r.RequestID)
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h.logger.Sugar().Debugf("ws request: %+v", r)
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retCh, started := h.worker.Submit(ctx, r)
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var ret worker.Response
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select {
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case <-baseCtx.Done(): // if connection lost
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return
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case <-ctx.Done(): // if context cancelled by cancelling request
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select {
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case <-started: // if started, wait for result
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ret = <-retCh
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default: // not started
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ret = worker.Response{
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RequestID: r.RequestID,
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Error: fmt.Errorf("request cancelled before execute"),
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}
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}
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case ret = <-retCh:
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}
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h.logger.Sugar().Debugf("ws response: %+v", ret)
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resp, err := model.ConvertResponse(ret, false)
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if err != nil {
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resp = model.Response{
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RequestID: r.RequestID,
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ErrorMsg: resp.ErrorMsg,
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}
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}
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select {
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case <-baseCtx.Done():
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case resultCh <- resp:
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}
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}()
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return nil
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}
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// read request
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go func() {
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defer conn.Close()
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conn.SetReadDeadline(time.Now().Add(pongWait))
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conn.SetPongHandler(func(string) error {
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conn.SetReadDeadline(time.Now().Add(pongWait))
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return nil
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})
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baseCtx, baseCancel := context.WithCancel(context.TODO())
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defer baseCancel()
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for {
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req := new(wsRequest)
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if err := conn.ReadJSON(req); err != nil {
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h.logger.Sugar().Warn("ws read error:", err)
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return
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}
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if err := handleRequest(baseCtx, req); err != nil {
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h.logger.Sugar().Warn(err.Error())
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return
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}
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}
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}()
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// write result
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go func() {
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defer conn.Close()
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ticker := time.NewTicker(pingPeriod)
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defer ticker.Stop()
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for {
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select {
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case r := <-resultCh:
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conn.SetWriteDeadline(time.Now().Add(writeWait))
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if err := conn.WriteJSON(r); err != nil {
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h.logger.Sugar().Warn("ws write error:", err)
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return
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}
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case <-ticker.C:
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conn.SetWriteDeadline(time.Now().Add(writeWait))
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if err := conn.WriteMessage(websocket.PingMessage, nil); err != nil {
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return
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}
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}
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}
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}()
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}
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type contextMap struct {
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m map[string]context.CancelFunc
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mu sync.Mutex
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}
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func newContextMap() *contextMap {
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return &contextMap{m: make(map[string]context.CancelFunc)}
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}
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func (c *contextMap) Add(reqId string, cancel context.CancelFunc) error {
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if reqId == "" {
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return fmt.Errorf("empty request id")
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}
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c.mu.Lock()
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defer c.mu.Unlock()
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if _, exist := c.m[reqId]; exist {
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return fmt.Errorf("duplicated request id: %v", reqId)
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}
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c.m[reqId] = cancel
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return nil
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}
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func (c *contextMap) Remove(reqId string) {
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c.mu.Lock()
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defer c.mu.Unlock()
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if cancel, exist := c.m[reqId]; exist {
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delete(c.m, reqId)
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cancel()
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}
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}
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