fix(limit): remove limit record when error occur

internal/base/middleware/rate_limit.go

@@ -25,20 +25,29 @@ func NewRateLimitMiddleware(limitRepo *limit.LimitRepo) *RateLimitMiddleware {
 
 // DuplicateRequestRejection detects and rejects duplicate requests
 // It only works for the requests that post content. Such as add question, add answer, comment etc.
-func (rm *RateLimitMiddleware) DuplicateRequestRejection(ctx *gin.Context, req any) bool {
+func (rm *RateLimitMiddleware) DuplicateRequestRejection(ctx *gin.Context, req any) (reject bool, key string) {
 	userID := GetLoginUserIDFromContext(ctx)
 	fullPath := ctx.FullPath()
 	reqJson, _ := json.Marshal(req)
-	key := encryption.MD5(fmt.Sprintf("%s:%s:%s", userID, fullPath, string(reqJson)))
-	reject, err := rm.limitRepo.CheckAndRecord(ctx, key)
+	key = encryption.MD5(fmt.Sprintf("%s:%s:%s", userID, fullPath, string(reqJson)))
+	var err error
+	reject, err = rm.limitRepo.CheckAndRecord(ctx, key)
 	if err != nil {
 		log.Errorf("check and record rate limit error: %s", err.Error())
-		return false
+		return false, key
 	}
 	if !reject {
-		return false
+		return false, key
 	}
 	log.Debugf("duplicate request: [%s] %s", fullPath, string(reqJson))
 	handler.HandleResponse(ctx, errors.BadRequest(reason.DuplicateRequestError), nil)
-	return true
+	return true, key
+}
+
+// DuplicateRequestClear clear duplicate request record
+func (rm *RateLimitMiddleware) DuplicateRequestClear(ctx *gin.Context, key string) {
+	err := rm.limitRepo.ClearRecord(ctx, key)
+	if err != nil {
+		log.Errorf("clear rate limit error: %s", err.Error())
+	}
 }

internal/controller/answer_controller.go

@@ -2,6 +2,7 @@ package controller
 
 import (
 	"fmt"
+	"net/http"
 
 	"github.com/answerdev/answer/internal/base/handler"
 	"github.com/answerdev/answer/internal/base/middleware"
@@ -171,9 +172,16 @@ func (ac *AnswerController) Add(ctx *gin.Context) {
 	if handler.BindAndCheck(ctx, req) {
 		return
 	}
-	if ac.rateLimitMiddleware.DuplicateRequestRejection(ctx, req) {
+	reject, rejectKey := ac.rateLimitMiddleware.DuplicateRequestRejection(ctx, req)
+	if reject {
 		return
 	}
+	defer func() {
+		// If status is not 200 means that the bad request has been returned, so the record should be cleared
+		if ctx.Writer.Status() != http.StatusOK {
+			ac.rateLimitMiddleware.DuplicateRequestClear(ctx, rejectKey)
+		}
+	}()
 	req.QuestionID = uid.DeShortID(req.QuestionID)
 	req.UserID = middleware.GetLoginUserIDFromContext(ctx)
 

internal/controller/comment_controller.go

@@ -15,6 +15,7 @@ import (
 	"github.com/answerdev/answer/pkg/uid"
 	"github.com/gin-gonic/gin"
 	"github.com/segmentfault/pacman/errors"
+	"net/http"
 )
 
 // CommentController comment controller
@@ -55,9 +56,16 @@ func (cc *CommentController) AddComment(ctx *gin.Context) {
 	if handler.BindAndCheck(ctx, req) {
 		return
 	}
-	if cc.rateLimitMiddleware.DuplicateRequestRejection(ctx, req) {
+	reject, rejectKey := cc.rateLimitMiddleware.DuplicateRequestRejection(ctx, req)
+	if reject {
 		return
 	}
+	defer func() {
+		// If status is not 200 means that the bad request has been returned, so the record should be cleared
+		if ctx.Writer.Status() != http.StatusOK {
+			cc.rateLimitMiddleware.DuplicateRequestClear(ctx, rejectKey)
+		}
+	}()
 	req.ObjectID = uid.DeShortID(req.ObjectID)
 	req.UserID = middleware.GetLoginUserIDFromContext(ctx)
 

internal/controller/question_controller.go

@@ -18,6 +18,7 @@ import (
 	"github.com/gin-gonic/gin"
 	"github.com/jinzhu/copier"
 	"github.com/segmentfault/pacman/errors"
+	"net/http"
 )
 
 // QuestionController question controller
@@ -335,9 +336,16 @@ func (qc *QuestionController) AddQuestion(ctx *gin.Context) {
 	if ctx.IsAborted() {
 		return
 	}
-	if qc.rateLimitMiddleware.DuplicateRequestRejection(ctx, req) {
+	reject, rejectKey := qc.rateLimitMiddleware.DuplicateRequestRejection(ctx, req)
+	if reject {
 		return
 	}
+	defer func() {
+		// If status is not 200 means that the bad request has been returned, so the record should be cleared
+		if ctx.Writer.Status() != http.StatusOK {
+			qc.rateLimitMiddleware.DuplicateRequestClear(ctx, rejectKey)
+		}
+	}()
 
 	req.UserID = middleware.GetLoginUserIDFromContext(ctx)
 	canList, requireRanks, err := qc.rankService.CheckOperationPermissionsForRanks(ctx, req.UserID, []string{

internal/repo/limit/limit.go

@@ -2,10 +2,12 @@ package limit
 
 import (
 	"context"
+	"fmt"
 	"github.com/answerdev/answer/internal/base/constant"
 	"github.com/answerdev/answer/internal/base/data"
 	"github.com/answerdev/answer/internal/base/reason"
 	"github.com/segmentfault/pacman/errors"
+	"time"
 )
 
 // LimitRepo auth repository
@@ -29,9 +31,15 @@ func (lr *LimitRepo) CheckAndRecord(ctx context.Context, key string) (limit bool
 	if exist {
 		return true, nil
 	}
-	err = lr.data.Cache.SetString(ctx, constant.RateLimitCacheKeyPrefix+key, "1", constant.RateLimitCacheTime)
+	err = lr.data.Cache.SetString(ctx, constant.RateLimitCacheKeyPrefix+key,
+		fmt.Sprintf("%d", time.Now().Unix()), constant.RateLimitCacheTime)
 	if err != nil {
 		return false, errors.InternalServer(reason.DatabaseError).WithError(err).WithStack()
 	}
 	return false, nil
 }
+
+// ClearRecord clear
+func (lr *LimitRepo) ClearRecord(ctx context.Context, key string) error {
+	return lr.data.Cache.Del(ctx, constant.RateLimitCacheKeyPrefix+key)
+}