feat: implement RAG-based chatbot service with daily usage rate limiting and background index worker

internal/controllers/chatbotController.go

@@ -45,8 +45,18 @@ func (cx *ChatbotController) Chat(c fiber.Ctx) error {
 		})
 	}
 
-	answer, err := cx.chatbotService.Chat(ctx, dto.ProjectID, dto.Question)
+	claims := c.Locals("user").(*response.JWTClaims)
+
+	answer, err := cx.chatbotService.Chat(ctx, claims.UId, dto.ProjectID, dto.Question)
 	if err != nil {
+		// Trả về lỗi 429 (Too Many Requests) nếu hết lượt dùng
+		if err.Error() == "you have reached your daily limit of 10 questions. Please come back tomorrow" {
+			return c.Status(fiber.StatusTooManyRequests).JSON(response.CommonResponse{
+				Status:  false,
+				Message: err.Error(),
+			})
+		}
+
 		return c.Status(fiber.StatusInternalServerError).JSON(response.CommonResponse{
 			Status:  false,
 			Message: err.Error(),

internal/controllers/submissionController.go

@@ -78,7 +78,7 @@ func (s *submissionController) CreateSubmission(c fiber.Ctx) error {
 // @Security BearerAuth
 // @Router /submissions/{id}/status [patch]
 func (s *submissionController) UpdateSubmissionStatus(c fiber.Ctx) error {
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	ctx, cancel := context.WithTimeout(context.Background(), 300*time.Second)
 	defer cancel()
 	id := c.Params("id")
 	uid := c.Locals("uid").(string)

internal/models/rag.go

@@ -15,3 +15,25 @@ type RagChunk struct {
 	CreatedAt  time.Time `json:"created_at"`
 	UpdatedAt  time.Time `json:"updated_at"`
 }
+
+type RagIndexTask struct {
+	ProjectID       string           `json:"project_id"`
+	DeleteWikiIDs   []string         `json:"delete_wiki_ids"`
+	DeleteEntityIDs []string         `json:"delete_entity_ids"`
+	Wikis           []*RagWikiItem   `json:"wikis"`
+	Entities        []*RagEntityItem `json:"entities"`
+}
+
+type RagWikiItem struct {
+	ID     string `json:"id"`
+	Title  string `json:"title"`
+	Doc    string `json:"doc"`
+	Source string `json:"source"`
+}
+
+type RagEntityItem struct {
+	ID          string `json:"id"`
+	Name        string `json:"name"`
+	Description string `json:"description"`
+	Source      string `json:"source"`
+}

internal/repositories/usageRepository.go

@@ -0,0 +1,55 @@
+package repositories
+
+import (
+	"context"
+	"fmt"
+	"history-api/pkg/cache"
+	"history-api/pkg/constants"
+	"time"
+)
+
+type UsageRepository interface {
+	GetAIUsage(ctx context.Context, userID string) (int, error)
+	IncrementAIUsage(ctx context.Context, userID string) (int, error)
+}
+
+type usageRepository struct {
+	c cache.Cache
+}
+
+func NewUsageRepository(c cache.Cache) UsageRepository {
+	return &usageRepository{
+		c: c,
+	}
+}
+
+func (r *usageRepository) getUsageKey(userID string) string {
+	dateStr := time.Now().Format("20060102")
+	return fmt.Sprintf("usage:ai:%s:%s", userID, dateStr)
+}
+
+func (r *usageRepository) GetAIUsage(ctx context.Context, userID string) (int, error) {
+	key := r.getUsageKey(userID)
+	var count int
+	err := r.c.Get(ctx, key, &count)
+	if err != nil {
+		return 0, nil
+	}
+	return count, nil
+}
+
+func (r *usageRepository) IncrementAIUsage(ctx context.Context, userID string) (int, error) {
+	key := r.getUsageKey(userID)
+	rdb := r.c.GetRawClient()
+
+	count, err := rdb.Incr(ctx, key).Result()
+	if err != nil {
+		return 0, err
+	}
+
+	if count == 1 {
+		rdb.Expire(ctx, key, constants.UsageExpiration)
+	}
+
+	return int(count), nil
+}

internal/services/chatbotService.go

@@ -2,28 +2,41 @@ package services
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"history-api/internal/repositories"
 	"history-api/pkg/ai"
+	"history-api/pkg/constants"
 )
 
 type ChatbotService interface {
-	Chat(ctx context.Context, projectID *string, question string) (string, error)
+	Chat(ctx context.Context, userID string, projectID *string, question string) (string, error)
 }
 
 type chatbotService struct {
-	repo     repositories.RagRepository
-	ragUtils *ai.RagUtils
+	repo      repositories.RagRepository
+	usageRepo repositories.UsageRepository
+	ragUtils  *ai.RagUtils
 }
 
-func NewChatbotService(repo repositories.RagRepository, ragUtils *ai.RagUtils) ChatbotService {
+func NewChatbotService(repo repositories.RagRepository, usageRepo repositories.UsageRepository, ragUtils *ai.RagUtils) ChatbotService {
 	return &chatbotService{
-		repo:     repo,
-		ragUtils: ragUtils,
+		repo:      repo,
+		usageRepo: usageRepo,
+		ragUtils:  ragUtils,
 	}
 }
 
-func (s *chatbotService) Chat(ctx context.Context, projectID *string, question string) (string, error) {
+func (s *chatbotService) Chat(ctx context.Context, userID string, projectID *string, question string) (string, error) {
+	usage, err := s.usageRepo.GetAIUsage(ctx, userID)
+	if err != nil {
+		return "", fmt.Errorf("failed to check usage: %w", err)
+	}
+
+	if usage >= constants.MaxDailyAIUsage {
+		return "", errors.New("you have reached your daily limit of 10 questions. Please come back tomorrow")
+	}
+
 	qVector, err := s.ragUtils.EmbedQuery(ctx, question)
 	if err != nil {
 		return "", fmt.Errorf("failed to embed question: %w", err)
@@ -61,5 +74,13 @@ Context:
 Question: %s`, contextStr, question)
 	}
 
-	return s.ragUtils.GenerateResponse(ctx, prompt)
+	response, err := s.ragUtils.GenerateResponse(ctx, prompt)
+	if err != nil {
+		return "", err
+	}
+
+	// 3. Tăng số lần sử dụng sau khi gọi AI thành công
+	_, _ = s.usageRepo.IncrementAIUsage(ctx, userID)
+
+	return response, nil
 }

internal/services/submissionService.go

@@ -15,12 +15,13 @@ import (
 	"history-api/pkg/cache"
 	"history-api/pkg/constants"
 	"history-api/pkg/convert"
-	"strconv"
 	"slices"
+	"strconv"
 
 	"github.com/gofiber/fiber/v3"
 	"github.com/jackc/pgx/v5/pgtype"
 	"github.com/jackc/pgx/v5/pgxpool"
+	"github.com/rs/zerolog/log"
 	"golang.org/x/sync/errgroup"
 )
 
@@ -166,7 +167,6 @@ func (s *submissionService) UpdateSubmissionStatus(ctx context.Context, reviewer
 	entityRepo := s.entityRepo.WithTx(tx)
 	geometryRepo := s.geometryRepo.WithTx(tx)
 	wikiRepo := s.wikiRepo.WithTx(tx)
-	ragRepo := s.ragRepo.WithTx(tx)
 
 	submissionUUID, err := convert.StringToUUID(submissionID)
 	if err != nil {
@@ -625,33 +625,31 @@ func (s *submissionService) UpdateSubmissionStatus(ctx context.Context, reviewer
 			}
 		}
 
-		_ = ragRepo.DeleteBySourceIDs(ctx, "wiki", wikiDeleteIDs)
-		_ = ragRepo.DeleteBySourceIDs(ctx, "entity", entityDeleteIDs)
-
-		for _, wiki := range snapshotData.Wikis {
-			if wiki.Source == "inline" {
-				cleanText := s.ragUtils.StripHTML(wiki.Title + "\n" + wiki.Doc)
-				chunks, vectors, err := s.ragUtils.PrepareChunks(ctx, cleanText)
-				if err == nil {
-					_ = ragRepo.DeleteBySourceIDs(ctx, "wiki", []string{wiki.ID})
-					for i, chunk := range chunks {
-						_ = ragRepo.SaveChunk(ctx, "wiki", wiki.ID, commit.ProjectID, i, chunk, vectors[i])
-					}
-				}
-			}
+		ragTask := models.RagIndexTask{
+			ProjectID:       commit.ProjectID,
+			DeleteWikiIDs:   wikiDeleteIDs,
+			DeleteEntityIDs: entityDeleteIDs,
 		}
 
+		for _, wiki := range snapshotData.Wikis {
+			ragTask.Wikis = append(ragTask.Wikis, &models.RagWikiItem{
+				ID:     wiki.ID,
+				Title:  wiki.Title,
+				Doc:    wiki.Doc,
+				Source: wiki.Source,
+			})
+		}
 		for _, entity := range snapshotData.Entities {
-			if entity.Source == "inline" {
-				cleanText := s.ragUtils.StripHTML(entity.Name + "\n" + entity.Description)
-				chunks, vectors, err := s.ragUtils.PrepareChunks(ctx, cleanText)
-				if err == nil {
-					_ = ragRepo.DeleteBySourceIDs(ctx, "entity", []string{entity.ID})
-					for i, chunk := range chunks {
-						_ = ragRepo.SaveChunk(ctx, "entity", entity.ID, commit.ProjectID, i, chunk, vectors[i])
-					}
-				}
-			}
+			ragTask.Entities = append(ragTask.Entities, &models.RagEntityItem{
+				ID:          entity.ID,
+				Name:        entity.Name,
+				Description: entity.Description,
+				Source:      entity.Source,
+			})
+		}
+
+		if err := s.c.PublishTask(ctx, constants.StreamRagName, constants.TaskTypeRagIndexSubmission, ragTask); err != nil {
+			log.Error().Err(err).Str("project_id", commit.ProjectID).Msg("Failed to publish RAG index task")
 		}
 	}
 
@@ -677,6 +675,7 @@ func (s *submissionService) UpdateSubmissionStatus(ctx context.Context, reviewer
 			bgCtx := context.Background()
 			_ = s.c.DelByPattern(bgCtx, "entity:search*")
 			_ = s.c.DelByPattern(bgCtx, "geometry:search*")
+			_ = s.c.DelByPattern(bgCtx, "geometry:search:entity*")
 			_ = s.c.DelByPattern(bgCtx, "wiki:search*")
 		}()
 	}