feat: add PDF document recognition with 10-page pre-hook

- Migrate recognition_results table to JSON schema (meta_data + content),
  replacing flat latex/markdown/mathml/mml columns
- Add TaskTypePDF constant and update all formula read/write paths
- Add PDFRecognitionService using pdftoppm (Poppler) for CGO-free page
  rendering; limits processing to first 10 pages (pre-hook)
- Reuse existing downstream OCR endpoint (cloud.texpixel.com) for each
  page image; stores results as [{page_number, markdown}] JSON array
- Add Redis queue + distributed lock for PDF worker goroutine
- Add REST endpoints: POST /v1/pdf/recognition, GET /v1/pdf/recognition/:task_no
- Add .pdf to OSS upload file type whitelist
- Add migrations/pdf_recognition.sql for safe data migration

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

api/router.go

@@ -4,6 +4,7 @@ import (
 	"gitea.com/texpixel/document_ai/api/v1/analytics"
 	"gitea.com/texpixel/document_ai/api/v1/formula"
 	"gitea.com/texpixel/document_ai/api/v1/oss"
+	"gitea.com/texpixel/document_ai/api/v1/pdf"
 	"gitea.com/texpixel/document_ai/api/v1/task"
 	"gitea.com/texpixel/document_ai/api/v1/user"
 	"gitea.com/texpixel/document_ai/pkg/common"
@@ -55,6 +56,13 @@ func SetupRouter(engine *gin.RouterGroup) {
 			userAuthRouter.GET("/info", common.MustAuthMiddleware(), userEndpoint.GetUserInfo)
 		}
 
+		pdfRouter := v1.Group("/pdf", common.GetAuthMiddleware())
+		{
+			endpoint := pdf.NewPDFEndpoint()
+			pdfRouter.POST("/recognition", endpoint.CreateTask)
+			pdfRouter.GET("/recognition/:task_no", endpoint.GetTaskStatus)
+		}
+
 		// 数据埋点路由
 		analyticsRouter := v1.Group("/analytics", common.GetAuthMiddleware())
 		{

api/v1/oss/handler.go

@@ -70,7 +70,7 @@ func (h *OSSEndpoint) GetSignatureURL(ctx *gin.Context) {
 		ctx.JSON(http.StatusOK, common.ErrorResponse(ctx, common.CodeParamError, "invalid file name"))
 		return
 	}
-	if !utils.InArray(extend, []string{".jpg", ".jpeg", ".png", ".gif", ".bmp", ".tiff", ".webp"}) {
+	if !utils.InArray(extend, []string{".jpg", ".jpeg", ".png", ".gif", ".bmp", ".tiff", ".webp", ".pdf"}) {
 		ctx.JSON(http.StatusOK, common.ErrorResponse(ctx, common.CodeParamError, "invalid file type"))
 		return
 	}

api/v1/pdf/handler.go

@@ -0,0 +1,95 @@
+package pdf
+
+import (
+	"net/http"
+	"path/filepath"
+	"strings"
+
+	pdfmodel "gitea.com/texpixel/document_ai/internal/model/pdf"
+	"gitea.com/texpixel/document_ai/internal/service"
+	"gitea.com/texpixel/document_ai/pkg/common"
+	"gitea.com/texpixel/document_ai/pkg/constant"
+
+	"github.com/gin-gonic/gin"
+)
+
+type PDFEndpoint struct {
+	pdfService *service.PDFRecognitionService
+}
+
+func NewPDFEndpoint() *PDFEndpoint {
+	return &PDFEndpoint{
+		pdfService: service.NewPDFRecognitionService(),
+	}
+}
+
+// CreateTask godoc
+// @Summary Create a PDF recognition task
+// @Description Create a new PDF recognition task (max 10 pages processed)
+// @Tags PDF
+// @Accept json
+// @Produce json
+// @Param request body pdfmodel.CreatePDFRecognitionRequest true "Create PDF task request"
+// @Success 200 {object} common.Response{data=pdfmodel.CreatePDFTaskResponse}
+// @Failure 400 {object} common.Response
+// @Failure 500 {object} common.Response
+// @Router /v1/pdf/recognition [post]
+func (e *PDFEndpoint) CreateTask(c *gin.Context) {
+	var req pdfmodel.CreatePDFRecognitionRequest
+	if err := c.BindJSON(&req); err != nil {
+		c.JSON(http.StatusOK, common.ErrorResponse(c, common.CodeParamError, "参数错误"))
+		return
+	}
+	req.UserID = c.GetInt64(constant.ContextUserID)
+
+	if strings.ToLower(filepath.Ext(req.FileName)) != ".pdf" {
+		c.JSON(http.StatusOK, common.ErrorResponse(c, common.CodeParamError, "仅支持PDF文件"))
+		return
+	}
+
+	task, err := e.pdfService.CreatePDFTask(c, &req)
+	if err != nil {
+		if bizErr, ok := err.(*common.BusinessError); ok {
+			c.JSON(http.StatusOK, common.ErrorResponse(c, int(bizErr.Code), bizErr.Message))
+			return
+		}
+		c.JSON(http.StatusOK, common.ErrorResponse(c, common.CodeSystemError, "创建任务失败"))
+		return
+	}
+
+	c.JSON(http.StatusOK, common.SuccessResponse(c, &pdfmodel.CreatePDFTaskResponse{
+		TaskNo: task.TaskUUID,
+		Status: int(task.Status),
+	}))
+}
+
+// GetTaskStatus godoc
+// @Summary Get PDF recognition task status and results
+// @Description Poll task status; pages field populated when status=2 (completed)
+// @Tags PDF
+// @Accept json
+// @Produce json
+// @Param task_no path string true "Task No"
+// @Success 200 {object} common.Response{data=pdfmodel.GetPDFTaskResponse}
+// @Failure 404 {object} common.Response
+// @Failure 500 {object} common.Response
+// @Router /v1/pdf/recognition/{task_no} [get]
+func (e *PDFEndpoint) GetTaskStatus(c *gin.Context) {
+	var req pdfmodel.GetPDFTaskRequest
+	if err := c.ShouldBindUri(&req); err != nil {
+		c.JSON(http.StatusOK, common.ErrorResponse(c, common.CodeParamError, "参数错误"))
+		return
+	}
+
+	resp, err := e.pdfService.GetPDFTask(c, req.TaskNo)
+	if err != nil {
+		if bizErr, ok := err.(*common.BusinessError); ok {
+			c.JSON(http.StatusOK, common.ErrorResponse(c, int(bizErr.Code), bizErr.Message))
+			return
+		}
+		c.JSON(http.StatusOK, common.ErrorResponse(c, common.CodeSystemError, "查询任务失败"))
+		return
+	}
+
+	c.JSON(http.StatusOK, common.SuccessResponse(c, resp))
+}

cmd/migrate/main.go

@@ -195,12 +195,27 @@ func migrateData(testDB, prodDB *gorm.DB) error {
 				mathml = *item.MathML
 			}
 
-			newResult := dao.RecognitionResult{
+			contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{
-				TaskID:   newTask.ID, // 使用新任务的ID
-				TaskType: dao.TaskType(item.TaskType),
 				Latex:    latex,
 				Markdown: markdown,
 				MathML:   mathml,
+			})
+			if err != nil {
+				log.Printf("[%d/%d] 序列化公式内容失败: task_id=%d, error=%v", i+1, len(tasksWithResults), newTask.ID, err)
+				tx.Rollback()
+				errorCount++
+				continue
+			}
+			newResult := dao.RecognitionResult{
+				TaskID:   newTask.ID, // 使用新任务的ID
+				TaskType: dao.TaskType(item.TaskType),
+				Content:  contentJSON,
+			}
+			if err := newResult.SetMetaData(dao.ResultMetaData{TotalNum: 1}); err != nil {
+				log.Printf("[%d/%d] 序列化MetaData失败: task_id=%d, error=%v", i+1, len(tasksWithResults), newTask.ID, err)
+				tx.Rollback()
+				errorCount++
+				continue
 			}
 			// 保留原始时间戳
 			if item.ResultCreatedAt != nil {

go.mod

@@ -1,6 +1,6 @@
 module gitea.com/texpixel/document_ai
 
-go 1.20
+go 1.23.0
 
 require (
 	github.com/alibabacloud-go/darabonba-openapi v0.2.1
@@ -75,7 +75,7 @@ require (
 	golang.org/x/arch v0.8.0 // indirect
 	golang.org/x/exp v0.0.0-20230905200255-921286631fa9 // indirect
 	golang.org/x/net v0.25.0 // indirect
-	golang.org/x/sys v0.20.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
 	golang.org/x/text v0.20.0 // indirect
 	golang.org/x/time v0.5.0 // indirect
 	google.golang.org/protobuf v1.34.1 // indirect

go.sum

@@ -33,7 +33,9 @@ github.com/aliyun/aliyun-oss-go-sdk v3.0.2+incompatible/go.mod h1:T/Aws4fEfogEE9
 github.com/aliyun/credentials-go v1.1.2 h1:qU1vwGIBb3UJ8BwunHDRFtAhS6jnQLnde/yk0+Ih2GY=
 github.com/aliyun/credentials-go v1.1.2/go.mod h1:ozcZaMR5kLM7pwtCMEpVmQ242suV6qTJya2bDq4X1Tw=
 github.com/bsm/ginkgo/v2 v2.12.0 h1:Ny8MWAHyOepLGlLKYmXG4IEkioBysk6GpaRTLC8zwWs=
+github.com/bsm/ginkgo/v2 v2.12.0/go.mod h1:SwYbGRRDovPVboqFv0tPTcG1sN61LM1Z4ARdbAV9g4c=
 github.com/bsm/gomega v1.27.10 h1:yeMWxP2pV2fG3FgAODIY8EiRE3dy0aeFYt4l7wh6yKA=
+github.com/bsm/gomega v1.27.10/go.mod h1:JyEr/xRbxbtgWNi8tIEVPUYZ5Dzef52k01W3YH0H+O0=
 github.com/bytedance/sonic v1.11.6 h1:oUp34TzMlL+OY1OUWxHqsdkgC/Zfc85zGqw9siXjrc0=
 github.com/bytedance/sonic v1.11.6/go.mod h1:LysEHSvpvDySVdC2f87zGWf6CIKJcAvqab1ZaiQtds4=
 github.com/bytedance/sonic/loader v0.1.1 h1:c+e5Pt1k/cy5wMveRDyk2X4B9hF4g7an8N3zCYjJFNM=
@@ -51,11 +53,13 @@ github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSV
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
+github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
 github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
+github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/fsnotify/fsnotify v1.7.0 h1:8JEhPFa5W2WU7YfeZzPNqzMP6Lwt7L2715Ggo0nosvA=
 github.com/fsnotify/fsnotify v1.7.0/go.mod h1:40Bi/Hjc2AVfZrqy+aj+yEI+/bRxZnMJyTJwOpGvigM=
 github.com/gabriel-vasile/mimetype v1.4.3 h1:in2uUcidCuFcDKtdcBxlR0rJ1+fsokWf+uqxgUFjbI0=
@@ -65,6 +69,7 @@ github.com/gin-contrib/sse v0.1.0/go.mod h1:RHrZQHXnP2xjPF+u1gW/2HnVO7nvIa9PG3Gm
 github.com/gin-gonic/gin v1.10.0 h1:nTuyha1TYqgedzytsKYqna+DfLos46nTv2ygFy86HFU=
 github.com/gin-gonic/gin v1.10.0/go.mod h1:4PMNQiOhvDRa013RKVbsiNwoyezlm2rm0uX/T7kzp5Y=
 github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
+github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
 github.com/go-playground/locales v0.14.1/go.mod h1:hxrqLVvrK65+Rwrd5Fc6F2O76J/NuW9t0sjnWqG1slY=
 github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJnYK9S473LQFuzCbDbfSFY=
@@ -78,8 +83,11 @@ github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
 github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
 github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
 github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9 h1:au07oEsX2xN0ktxqI+Sida1w446QrXBRJ0nee3SNZlA=
+github.com/golang-sql/civil v0.0.0-20220223132316-b832511892a9/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
 github.com/golang-sql/sqlexp v0.1.0 h1:ZCD6MBpcuOVfGVqsEmY5/4FtYiKz6tSyUv9LPEDei6A=
+github.com/golang-sql/sqlexp v0.1.0/go.mod h1:J4ad9Vo8ZCWQ2GMrC4UCQy1JpCbwU9m3EOqtpKwwwHI=
 github.com/google/go-cmp v0.5.9 h1:O2Tfq5qg4qc4AmwVlvv0oLiVAGB7enBSJ2x2DqQFi38=
+github.com/google/go-cmp v0.5.9/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
 github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
 github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
@@ -89,9 +97,13 @@ github.com/gopherjs/gopherjs v0.0.0-20200217142428-fce0ec30dd00/go.mod h1:wJfORR
 github.com/hashicorp/hcl v1.0.0 h1:0Anlzjpi4vEasTeNFn2mLJgTSwt0+6sfsiTG8qcWGx4=
 github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
 github.com/jackc/pgpassfile v1.0.0 h1:/6Hmqy13Ss2zCq62VdNG8tM1wchn8zjSGOBJ6icpsIM=
+github.com/jackc/pgpassfile v1.0.0/go.mod h1:CEx0iS5ambNFdcRtxPj5JhEz+xB6uRky5eyVu/W2HEg=
 github.com/jackc/pgservicefile v0.0.0-20231201235250-de7065d80cb9 h1:L0QtFUgDarD7Fpv9jeVMgy/+Ec0mtnmYuImjTz6dtDA=
+github.com/jackc/pgservicefile v0.0.0-20231201235250-de7065d80cb9/go.mod h1:5TJZWKEWniPve33vlWYSoGYefn3gLQRzjfDlhSJ9ZKM=
 github.com/jackc/pgx/v5 v5.5.5 h1:amBjrZVmksIdNjxGW/IiIMzxMKZFelXbUoPNb+8sjQw=
+github.com/jackc/pgx/v5 v5.5.5/go.mod h1:ez9gk+OAat140fv9ErkZDYFWmXLfV+++K0uAOiwgm1A=
 github.com/jackc/puddle/v2 v2.2.1 h1:RhxXJtFG022u4ibrCSMSiu5aOq1i77R3OHKNJj77OAk=
+github.com/jackc/puddle/v2 v2.2.1/go.mod h1:vriiEXHvEE654aYKXXjOvZM39qJ0q+azkZFrfEOc3H4=
 github.com/jinzhu/inflection v1.0.0 h1:K317FqzuhWc8YvSVlFMCCUb36O/S9MCKRDI7QkRKD/E=
 github.com/jinzhu/inflection v1.0.0/go.mod h1:h+uFLlag+Qp1Va5pdKtLDYj+kHp5pxUVkryuEj+Srlc=
 github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
@@ -106,9 +118,11 @@ github.com/klauspost/cpuid/v2 v2.2.7 h1:ZWSB3igEs+d0qvnxR/ZBzXVmxkgt8DdzP6m9pfuV
 github.com/klauspost/cpuid/v2 v2.2.7/go.mod h1:Lcz8mBdAVJIBVzewtcLocK12l3Y+JytZYpaMropDUws=
 github.com/knz/go-libedit v1.10.1/go.mod h1:MZTVkCWyz0oBc7JOWP3wNAzd002ZbM/5hgShxwh4x8M=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
 github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
 github.com/magiconair/properties v1.8.7 h1:IeQXZAiQcpL9mgcAe1Nu6cX9LLw6ExEHKjN0VQdvPDY=
@@ -120,7 +134,9 @@ github.com/mattn/go-isatty v0.0.19/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
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 github.com/mattn/go-sqlite3 v1.14.15 h1:vfoHhTN1af61xCRSWzFIWzx2YskyMTwHLrExkBOjvxI=
+github.com/mattn/go-sqlite3 v1.14.15/go.mod h1:2eHXhiwb8IkHr+BDWZGa96P6+rkvnG63S2DGjv9HUNg=
 github.com/microsoft/go-mssqldb v1.7.2 h1:CHkFJiObW7ItKTJfHo1QX7QBBD1iV+mn1eOyRP3b/PA=
+github.com/microsoft/go-mssqldb v1.7.2/go.mod h1:kOvZKUdrhhFQmxLZqbwUV0rHkNkZpthMITIb2Ko1IoA=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
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@@ -137,9 +153,11 @@ github.com/pelletier/go-toml/v2 v2.2.2/go.mod h1:1t835xjRzz80PqgE6HHgN2JOsmgYu/h
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+github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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 github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
+github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
 github.com/rs/xid v1.5.0/go.mod h1:trrq9SKmegXys3aeAKXMUTdJsYXVwGY3RLcfgqegfbg=
 github.com/rs/zerolog v1.33.0 h1:1cU2KZkvPxNyfgEmhHAz/1A9Bz+llsdYzklWFzgp0r8=
 github.com/rs/zerolog v1.33.0/go.mod h1:/7mN4D5sKwJLZQ2b/znpjC3/GQWY/xaDXUM0kKWRHss=
@@ -211,6 +229,7 @@ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.9.0 h1:fEo0HyrW1GIgZdpbhCRO0PkJajUS5H9IFUztCgEo2jQ=
+golang.org/x/sync v0.9.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -219,8 +238,8 @@ golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.12.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
+golang.org/x/sys v0.33.0 h1:q3i8TbbEz+JRD9ywIRlyRAQbM0qF7hu24q3teo2hbuw=
-golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.33.0/go.mod h1:BJP2sWEmIv4KK5OTEluFJCKSidICx8ciO85XgH3Ak8k=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.20.0 h1:gK/Kv2otX8gz+wn7Rmb3vT96ZwuoxnQlY+HlJVj7Qug=
@@ -254,8 +273,11 @@ gorm.io/datatypes v1.2.7/go.mod h1:M2iO+6S3hhi4nAyYe444Pcb0dcIiOMJ7QHaUXxyiNZY=
 gorm.io/driver/mysql v1.5.7 h1:MndhOPYOfEp2rHKgkZIhJ16eVUIRf2HmzgoPmh7FCWo=
 gorm.io/driver/mysql v1.5.7/go.mod h1:sEtPWMiqiN1N1cMXoXmBbd8C6/l+TESwriotuRRpkDM=
 gorm.io/driver/postgres v1.5.0 h1:u2FXTy14l45qc3UeCJ7QaAXZmZfDDv0YrthvmRq1l0U=
+gorm.io/driver/postgres v1.5.0/go.mod h1:FUZXzO+5Uqg5zzwzv4KK49R8lvGIyscBOqYrtI1Ce9A=
 gorm.io/driver/sqlite v1.4.3 h1:HBBcZSDnWi5BW3B3rwvVTc510KGkBkexlOg0QrmLUuU=
+gorm.io/driver/sqlite v1.4.3/go.mod h1:0Aq3iPO+v9ZKbcdiz8gLWRw5VOPcBOPUQJFLq5e2ecI=
 gorm.io/driver/sqlserver v1.6.0 h1:VZOBQVsVhkHU/NzNhRJKoANt5pZGQAS1Bwc6m6dgfnc=
+gorm.io/driver/sqlserver v1.6.0/go.mod h1:WQzt4IJo/WHKnckU9jXBLMJIVNMVeTu25dnOzehntWw=
 gorm.io/gorm v1.25.7/go.mod h1:hbnx/Oo0ChWMn1BIhpy1oYozzpM15i4YPuHDmfYtwg8=
 gorm.io/gorm v1.30.0 h1:qbT5aPv1UH8gI99OsRlvDToLxW5zR7FzS9acZDOZcgs=
 gorm.io/gorm v1.30.0/go.mod h1:8Z33v652h4//uMA76KjeDH8mJXPm1QNCYrMeatR0DOE=

internal/model/pdf/request.go

@@ -0,0 +1,34 @@
+package pdf
+
+// CreatePDFRecognitionRequest 创建PDF识别任务
+type CreatePDFRecognitionRequest struct {
+	FileURL  string `json:"file_url" binding:"required"`
+	FileHash string `json:"file_hash" binding:"required"`
+	FileName string `json:"file_name" binding:"required"`
+	UserID   int64  `json:"user_id"`
+}
+
+// GetPDFTaskRequest URI 参数
+type GetPDFTaskRequest struct {
+	TaskNo string `uri:"task_no" binding:"required"`
+}
+
+// CreatePDFTaskResponse 创建任务响应
+type CreatePDFTaskResponse struct {
+	TaskNo string `json:"task_no"`
+	Status int    `json:"status"`
+}
+
+// PDFPageResult 单页结果
+type PDFPageResult struct {
+	PageNumber int    `json:"page_number"`
+	Markdown   string `json:"markdown"`
+}
+
+// GetPDFTaskResponse 查询任务状态和结果
+type GetPDFTaskResponse struct {
+	TaskNo     string          `json:"task_no"`
+	Status     int             `json:"status"`
+	TotalPages int             `json:"total_pages"`
+	Pages      []PDFPageResult `json:"pages"`
+}

internal/service/pdf_recognition_service.go

@@ -0,0 +1,343 @@
+package service
+
+import (
+	"bytes"
+	"context"
+	"encoding/base64"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"time"
+
+	pdfmodel "gitea.com/texpixel/document_ai/internal/model/pdf"
+	"gitea.com/texpixel/document_ai/internal/storage/cache"
+	"gitea.com/texpixel/document_ai/internal/storage/dao"
+	"gitea.com/texpixel/document_ai/pkg/common"
+	"gitea.com/texpixel/document_ai/pkg/httpclient"
+	"gitea.com/texpixel/document_ai/pkg/log"
+	"gitea.com/texpixel/document_ai/pkg/oss"
+	"gitea.com/texpixel/document_ai/pkg/requestid"
+	"gitea.com/texpixel/document_ai/pkg/utils"
+	"gorm.io/gorm"
+
+	"gitea.com/texpixel/document_ai/internal/model/formula"
+)
+
+const (
+	pdfMaxPages    = 10
+	pdfOCREndpoint = "https://cloud.texpixel.com:10443/doc_process/v1/image/ocr"
+)
+
+// PDFRecognitionService 处理 PDF 识别任务
+type PDFRecognitionService struct {
+	db         *gorm.DB
+	queueLimit chan struct{}
+	stopChan   chan struct{}
+	httpClient *httpclient.Client
+}
+
+func NewPDFRecognitionService() *PDFRecognitionService {
+	s := &PDFRecognitionService{
+		db:         dao.DB,
+		queueLimit: make(chan struct{}, 3),
+		stopChan:   make(chan struct{}),
+		httpClient: httpclient.NewClient(nil),
+	}
+
+	utils.SafeGo(func() {
+		lock, err := cache.GetPDFDistributedLock(context.Background())
+		if err != nil || !lock {
+			log.Error(context.Background(), "func", "NewPDFRecognitionService", "msg", "获取PDF分布式锁失败")
+			return
+		}
+		s.processPDFQueue(context.Background())
+	})
+
+	return s
+}
+
+// CreatePDFTask 创建识别任务并入队
+func (s *PDFRecognitionService) CreatePDFTask(ctx context.Context, req *pdfmodel.CreatePDFRecognitionRequest) (*dao.RecognitionTask, error) {
+	task := &dao.RecognitionTask{
+		UserID:   req.UserID,
+		TaskUUID: utils.NewUUID(),
+		TaskType: dao.TaskTypePDF,
+		Status:   dao.TaskStatusPending,
+		FileURL:  req.FileURL,
+		FileName: req.FileName,
+		FileHash: req.FileHash,
+		IP:       common.GetIPFromContext(ctx),
+	}
+
+	if err := dao.NewRecognitionTaskDao().Create(dao.DB.WithContext(ctx), task); err != nil {
+		log.Error(ctx, "func", "CreatePDFTask", "msg", "创建任务失败", "error", err)
+		return nil, common.NewError(common.CodeDBError, "创建任务失败", err)
+	}
+
+	if _, err := cache.PushPDFTask(ctx, task.ID); err != nil {
+		log.Error(ctx, "func", "CreatePDFTask", "msg", "推入队列失败", "error", err)
+		return nil, common.NewError(common.CodeSystemError, "推入队列失败", err)
+	}
+
+	return task, nil
+}
+
+// GetPDFTask 查询任务状态和结果
+func (s *PDFRecognitionService) GetPDFTask(ctx context.Context, taskNo string) (*pdfmodel.GetPDFTaskResponse, error) {
+	sess := dao.DB.WithContext(ctx)
+	task, err := dao.NewRecognitionTaskDao().GetByTaskNo(sess, taskNo)
+	if err != nil {
+		if err == gorm.ErrRecordNotFound {
+			return nil, common.NewError(common.CodeNotFound, "任务不存在", err)
+		}
+		return nil, common.NewError(common.CodeDBError, "查询任务失败", err)
+	}
+
+	// 类型校验：防止公式任务被当成 PDF 解析
+	if task.TaskType != dao.TaskTypePDF {
+		return nil, common.NewError(common.CodeNotFound, "任务不存在", nil)
+	}
+
+	resp := &pdfmodel.GetPDFTaskResponse{
+		TaskNo: taskNo,
+		Status: int(task.Status),
+	}
+
+	if task.Status != dao.TaskStatusCompleted {
+		return resp, nil
+	}
+
+	result, err := dao.NewRecognitionResultDao().GetByTaskID(sess, task.ID)
+	if err != nil || result == nil {
+		return nil, common.NewError(common.CodeDBError, "查询识别结果失败", err)
+	}
+
+	pages, err := result.GetPDFContent()
+	if err != nil {
+		return nil, common.NewError(common.CodeSystemError, "解析识别结果失败", err)
+	}
+
+	resp.TotalPages = len(pages)
+	for _, p := range pages {
+		resp.Pages = append(resp.Pages, pdfmodel.PDFPageResult{
+			PageNumber: p.PageNumber,
+			Markdown:   p.Markdown,
+		})
+	}
+
+	return resp, nil
+}
+
+// processPDFQueue 持续消费队列
+func (s *PDFRecognitionService) processPDFQueue(ctx context.Context) {
+	for {
+		select {
+		case <-s.stopChan:
+			return
+		default:
+			s.processOnePDFTask(ctx)
+		}
+	}
+}
+
+func (s *PDFRecognitionService) processOnePDFTask(ctx context.Context) {
+	s.queueLimit <- struct{}{}
+	defer func() { <-s.queueLimit }()
+
+	taskID, err := cache.PopPDFTask(ctx)
+	if err != nil {
+		log.Error(ctx, "func", "processOnePDFTask", "msg", "获取任务失败", "error", err)
+		return
+	}
+
+	task, err := dao.NewRecognitionTaskDao().GetTaskByID(dao.DB.WithContext(ctx), taskID)
+	if err != nil || task == nil {
+		log.Error(ctx, "func", "processOnePDFTask", "msg", "任务不存在", "task_id", taskID)
+		return
+	}
+
+	ctx = context.WithValue(ctx, utils.RequestIDKey, task.TaskUUID)
+	requestid.SetRequestID(task.TaskUUID, func() {
+		if err := s.processPDFTask(ctx, taskID, task.FileURL); err != nil {
+			log.Error(ctx, "func", "processOnePDFTask", "msg", "处理PDF任务失败", "error", err)
+		}
+	})
+}
+
+// processPDFTask 核心处理：下载 → pre-hook → 逐页OCR → 写入DB
+func (s *PDFRecognitionService) processPDFTask(ctx context.Context, taskID int64, fileURL string) error {
+	ctx, cancel := context.WithTimeout(ctx, 10*time.Minute)
+	defer cancel()
+
+	taskDao := dao.NewRecognitionTaskDao()
+	resultDao := dao.NewRecognitionResultDao()
+
+	isSuccess := false
+	defer func() {
+		status, remark := dao.TaskStatusFailed, "任务处理失败"
+		if isSuccess {
+			status, remark = dao.TaskStatusCompleted, ""
+		}
+		_ = taskDao.Update(dao.DB.WithContext(context.Background()),
+			map[string]interface{}{"id": taskID},
+			map[string]interface{}{"status": status, "completed_at": time.Now(), "remark": remark},
+		)
+	}()
+
+	// 更新为处理中
+	if err := taskDao.Update(dao.DB.WithContext(ctx),
+		map[string]interface{}{"id": taskID},
+		map[string]interface{}{"status": dao.TaskStatusProcessing},
+	); err != nil {
+		return fmt.Errorf("更新任务状态失败: %w", err)
+	}
+
+	// 下载 PDF
+	reader, err := oss.DownloadFile(ctx, fileURL)
+	if err != nil {
+		return fmt.Errorf("下载PDF失败: %w", err)
+	}
+	defer reader.Close()
+
+	pdfBytes, err := io.ReadAll(reader)
+	if err != nil {
+		return fmt.Errorf("读取PDF数据失败: %w", err)
+	}
+
+	// pre-hook: 用 pdftoppm 渲染前 pdfMaxPages 页为 PNG
+	pageImages, err := renderPDFPages(ctx, pdfBytes, pdfMaxPages)
+	if err != nil {
+		return fmt.Errorf("渲染PDF页面失败: %w", err)
+	}
+
+	processPages := len(pageImages)
+	log.Info(ctx, "func", "processPDFTask", "msg", "开始处理PDF",
+		"task_id", taskID, "process_pages", processPages)
+
+	// 逐页 OCR，结果收集
+	var pages []dao.PDFPageContent
+	for i, imgBytes := range pageImages {
+		ocrResult, err := s.callOCR(ctx, imgBytes)
+		if err != nil {
+			return fmt.Errorf("OCR第%d页失败: %w", i+1, err)
+		}
+
+		pages = append(pages, dao.PDFPageContent{
+			PageNumber: i + 1,
+			Markdown:   ocrResult.Markdown,
+		})
+		log.Info(ctx, "func", "processPDFTask", "msg", "页面OCR完成",
+			"page", i+1, "total", processPages)
+	}
+
+	// 序列化并写入 DB（单行）
+	contentJSON, err := dao.MarshalPDFContent(pages)
+	if err != nil {
+		return fmt.Errorf("序列化PDF内容失败: %w", err)
+	}
+
+	dbResult := dao.RecognitionResult{
+		TaskID:   taskID,
+		TaskType: dao.TaskTypePDF,
+		Content:  contentJSON,
+	}
+	if err := dbResult.SetMetaData(dao.ResultMetaData{TotalNum: processPages}); err != nil {
+		return fmt.Errorf("序列化MetaData失败: %w", err)
+	}
+	if err := resultDao.Create(dao.DB.WithContext(ctx), dbResult); err != nil {
+		return fmt.Errorf("保存PDF结果失败: %w", err)
+	}
+
+	isSuccess = true
+	return nil
+}
+
+// renderPDFPages 使用 pdftoppm 将 PDF 渲染为 PNG 字节切片，最多渲染 maxPages 页
+func renderPDFPages(ctx context.Context, pdfBytes []byte, maxPages int) ([][]byte, error) {
+	tmpDir, err := os.MkdirTemp("", "pdf-ocr-*")
+	if err != nil {
+		return nil, fmt.Errorf("创建临时目录失败: %w", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	pdfPath := filepath.Join(tmpDir, "input.pdf")
+	if err := os.WriteFile(pdfPath, pdfBytes, 0600); err != nil {
+		return nil, fmt.Errorf("写入临时PDF失败: %w", err)
+	}
+
+	outPrefix := filepath.Join(tmpDir, "page")
+	cmd := exec.CommandContext(ctx, "pdftoppm",
+		"-r", "150",
+		"-png",
+		"-l", fmt.Sprintf("%d", maxPages),
+		pdfPath,
+		outPrefix,
+	)
+	if out, err := cmd.CombinedOutput(); err != nil {
+		return nil, fmt.Errorf("pdftoppm失败: %w, output: %s", err, string(out))
+	}
+
+	files, err := filepath.Glob(filepath.Join(tmpDir, "page-*.png"))
+	if err != nil {
+		return nil, fmt.Errorf("查找渲染输出文件失败: %w", err)
+	}
+	if len(files) == 0 {
+		return nil, fmt.Errorf("pdftoppm未输出任何页面")
+	}
+	sort.Strings(files)
+
+	pages := make([][]byte, 0, len(files))
+	for _, f := range files {
+		data, err := os.ReadFile(f)
+		if err != nil {
+			return nil, fmt.Errorf("读取页面图片失败: %w", err)
+		}
+		pages = append(pages, data)
+	}
+
+	return pages, nil
+}
+
+// callOCR 调用与公式识别相同的下游 OCR 接口
+func (s *PDFRecognitionService) callOCR(ctx context.Context, imgBytes []byte) (*formula.ImageOCRResponse, error) {
+	reqBody := map[string]string{
+		"image_base64": base64.StdEncoding.EncodeToString(imgBytes),
+	}
+	jsonData, err := json.Marshal(reqBody)
+	if err != nil {
+		return nil, err
+	}
+
+	headers := map[string]string{
+		"Content-Type":           "application/json",
+		utils.RequestIDHeaderKey: utils.GetRequestIDFromContext(ctx),
+	}
+
+	resp, err := s.httpClient.RequestWithRetry(ctx, http.MethodPost, pdfOCREndpoint, bytes.NewReader(jsonData), headers)
+	if err != nil {
+		return nil, fmt.Errorf("请求OCR接口失败: %w", err)
+	}
+	defer resp.Body.Close()
+
+	// 下游非 2xx 视为失败，避免把错误响应 body 当成识别结果存库
+	if resp.StatusCode != http.StatusOK {
+		body, _ := io.ReadAll(resp.Body)
+		return nil, fmt.Errorf("OCR接口返回非200状态: %d, body: %s", resp.StatusCode, string(body))
+	}
+
+	var ocrResp formula.ImageOCRResponse
+	if err := json.NewDecoder(resp.Body).Decode(&ocrResp); err != nil {
+		return nil, fmt.Errorf("解析OCR响应失败: %w", err)
+	}
+
+	return &ocrResp, nil
+}
+
+func (s *PDFRecognitionService) Stop() {
+	close(s.stopChan)
+}

internal/service/recognition_service.go

@@ -169,18 +169,21 @@ func (s *RecognitionService) GetFormualTask(ctx context.Context, taskNo string)
 		return nil, common.NewError(common.CodeDBError, "查询任务结果失败", err)
 	}
 
-	// 构建 Markdown 格式
+	formulaContent, err := taskRet.GetFormulaContent()
-	markdown := taskRet.Markdown
+	if err != nil {
-	if markdown == "" {
+		log.Error(ctx, "func", "GetFormualTask", "msg", "解析公式内容失败", "error", err)
-		markdown = fmt.Sprintf("$$%s$$", taskRet.Latex)
+		return nil, common.NewError(common.CodeSystemError, "解析识别结果失败", err)
+	}
+	markdown := formulaContent.Markdown
+	if markdown == "" {
+		markdown = fmt.Sprintf("$$%s$$", formulaContent.Latex)
 	}
-
 	return &formula.GetFormulaTaskResponse{
 		TaskNo:   taskNo,
-		Latex:    taskRet.Latex,
+		Latex:    formulaContent.Latex,
 		Markdown: markdown,
-		MathML:   taskRet.MathML,
+		MathML:   formulaContent.MathML,
-		MML:      taskRet.MML,
+		MML:      formulaContent.MML,
 		Status:   int(task.Status),
 	}, nil
 }
@@ -539,14 +542,26 @@ func (s *RecognitionService) processFormulaTask(ctx context.Context, taskID int6
 		log.Error(ctx, "func", "processFormulaTask", "msg", "解析响应JSON失败", "error", err)
 		return err
 	}
-	err = resultDao.Create(tx, dao.RecognitionResult{
+	contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{
-		TaskID:   taskID,
-		TaskType: dao.TaskTypeFormula,
 		Latex:    ocrResp.Latex,
 		Markdown: ocrResp.Markdown,
 		MathML:   ocrResp.MathML,
 		MML:      ocrResp.MML,
 	})
+	if err != nil {
+		log.Error(ctx, "func", "processFormulaTask", "msg", "序列化公式内容失败", "error", err)
+		return err
+	}
+	result := dao.RecognitionResult{
+		TaskID:   taskID,
+		TaskType: dao.TaskTypeFormula,
+		Content:  contentJSON,
+	}
+	if err = result.SetMetaData(dao.ResultMetaData{TotalNum: 1}); err != nil {
+		log.Error(ctx, "func", "processFormulaTask", "msg", "序列化MetaData失败", "error", err)
+		return err
+	}
+	err = resultDao.Create(tx, result)
 	if err != nil {
 		log.Error(ctx, "func", "processFormulaTask", "msg", "保存任务结果失败", "error", err)
 		return err
@@ -662,15 +677,25 @@ func (s *RecognitionService) processVLFormulaTask(ctx context.Context, taskID in
 		return err
 	}
 	if result == nil {
-		formulaRes := &dao.RecognitionResult{TaskID: taskID, TaskType: dao.TaskTypeFormula, Latex: latex}
+		contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{Latex: latex})
-		err = resultDao.Create(dao.DB.WithContext(ctx), *formulaRes)
+		if err != nil {
+			log.Error(ctx, "func", "processVLFormulaTask", "msg", "序列化公式内容失败", "error", err)
+			return err
+		}
+		newResult := dao.RecognitionResult{TaskID: taskID, TaskType: dao.TaskTypeFormula, Content: contentJSON}
+		_ = newResult.SetMetaData(dao.ResultMetaData{TotalNum: 1})
+		err = resultDao.Create(dao.DB.WithContext(ctx), newResult)
 		if err != nil {
 			log.Error(ctx, "func", "processVLFormulaTask", "msg", "创建任务结果失败", "error", err)
 			return err
 		}
 	} else {
-		result.Latex = latex
+		contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{Latex: latex})
-		err = resultDao.Update(dao.DB.WithContext(ctx), result.ID, map[string]interface{}{"latex": latex})
+		if err != nil {
+			log.Error(ctx, "func", "processVLFormulaTask", "msg", "序列化公式内容失败", "error", err)
+			return err
+		}
+		err = resultDao.Update(dao.DB.WithContext(ctx), result.ID, map[string]interface{}{"content": contentJSON})
 		if err != nil {
 			log.Error(ctx, "func", "processVLFormulaTask", "msg", "更新任务结果失败", "error", err)
 			return err
@@ -851,23 +876,35 @@ func (s *RecognitionService) processMathpixTask(ctx context.Context, taskID int6
 
 	if result == nil {
 		// 创建新结果
-		err = resultDao.Create(dao.DB.WithContext(ctx), dao.RecognitionResult{
+		contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{
-			TaskID:   taskID,
-			TaskType: dao.TaskTypeFormula,
 			Latex:    mathpixResp.LatexStyled,
 			Markdown: mathpixResp.Text,
 			MathML:   mathpixResp.GetMathML(),
 		})
+		if err != nil {
+			log.Error(ctx, "func", "processMathpixTask", "msg", "序列化公式内容失败", "error", err)
+			return err
+		}
+		newResult := dao.RecognitionResult{TaskID: taskID, TaskType: dao.TaskTypeFormula, Content: contentJSON}
+		_ = newResult.SetMetaData(dao.ResultMetaData{TotalNum: 1})
+		err = resultDao.Create(dao.DB.WithContext(ctx), newResult)
 		if err != nil {
 			log.Error(ctx, "func", "processMathpixTask", "msg", "创建任务结果失败", "error", err)
 			return err
 		}
 	} else {
 		// 更新现有结果
+		contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{
+			Latex:    mathpixResp.LatexStyled,
+			Markdown: mathpixResp.Text,
+			MathML:   mathpixResp.GetMathML(),
+		})
+		if err != nil {
+			log.Error(ctx, "func", "processMathpixTask", "msg", "序列化公式内容失败", "error", err)
+			return err
+		}
 		err = resultDao.Update(dao.DB.WithContext(ctx), result.ID, map[string]interface{}{
-			"latex":    mathpixResp.LatexStyled,
+			"content": contentJSON,
-			"markdown": mathpixResp.Text,
-			"mathml":   mathpixResp.GetMathML(),
 		})
 		if err != nil {
 			log.Error(ctx, "func", "processMathpixTask", "msg", "更新任务结果失败", "error", err)
@@ -1027,23 +1064,35 @@ func (s *RecognitionService) processBaiduOCRTask(ctx context.Context, taskID int
 
 	if result == nil {
 		// 创建新结果
-		err = resultDao.Create(dao.DB.WithContext(ctx), dao.RecognitionResult{
+		contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{
-			TaskID:   taskID,
-			TaskType: dao.TaskTypeFormula,
 			Markdown: markdownResult,
 			Latex:    latex,
 			MathML:   mml,
 		})
+		if err != nil {
+			log.Error(ctx, "func", "processBaiduOCRTask", "msg", "序列化公式内容失败", "error", err)
+			return err
+		}
+		newResult := dao.RecognitionResult{TaskID: taskID, TaskType: dao.TaskTypeFormula, Content: contentJSON}
+		_ = newResult.SetMetaData(dao.ResultMetaData{TotalNum: 1})
+		err = resultDao.Create(dao.DB.WithContext(ctx), newResult)
 		if err != nil {
 			log.Error(ctx, "func", "processBaiduOCRTask", "msg", "创建任务结果失败", "error", err)
 			return err
 		}
 	} else {
 		// 更新现有结果
+		contentJSON, err := dao.MarshalFormulaContent(dao.FormulaContent{
+			Markdown: markdownResult,
+			Latex:    latex,
+			MathML:   mml,
+		})
+		if err != nil {
+			log.Error(ctx, "func", "processBaiduOCRTask", "msg", "序列化公式内容失败", "error", err)
+			return err
+		}
 		err = resultDao.Update(dao.DB.WithContext(ctx), result.ID, map[string]interface{}{
-			"markdown": markdownResult,
+			"content": contentJSON,
-			"latex":    latex,
-			"mathml":   mml,
 		})
 		if err != nil {
 			log.Error(ctx, "func", "processBaiduOCRTask", "msg", "更新任务结果失败", "error", err)

internal/service/task.go

@@ -89,17 +89,17 @@ func (svc *TaskService) GetTaskList(ctx context.Context, req *task.TaskListReque
 		Total:    total,
 	}
 	for _, item := range tasks {
-		var latex string
+		var latex, markdown, mathML, mml string
-		var markdown string
-		var mathML string
-		var mml string
 		recognitionResult := recognitionResultMap[item.ID]
-		if recognitionResult != nil {
+		if recognitionResult != nil && recognitionResult.TaskType == dao.TaskTypeFormula {
-			latex = recognitionResult.Latex
+			if fc, err := recognitionResult.GetFormulaContent(); err == nil {
-			markdown = recognitionResult.Markdown
+				latex = fc.Latex
-			mathML = recognitionResult.MathML
+				markdown = fc.Markdown
-			mml = recognitionResult.MML
+				mathML = fc.MathML
+				mml = fc.MML
 			}
+		}
+		// PDF 类型的 TaskListDTO 暂不展开 content（列表页只显示状态）
 		originURL, err := oss.GetDownloadURL(ctx, item.FileURL)
 		if err != nil {
 			log.Error(ctx, "func", "GetTaskList", "msg", "get origin url failed", "error", err)
@@ -148,11 +148,19 @@ func (svc *TaskService) ExportTask(ctx context.Context, req *task.ExportTaskRequ
 		return nil, "", errors.New("recognition result not found")
 	}
 
-	markdown := recognitionResult.Markdown
+	var markdown string
-	if markdown == "" {
+	switch recognitionResult.TaskType {
-		log.Error(ctx, "func", "ExportTask", "msg", "markdown not found")
+	case dao.TaskTypeFormula:
+		fc, err := recognitionResult.GetFormulaContent()
+		if err != nil || fc.Markdown == "" {
+			log.Error(ctx, "func", "ExportTask", "msg", "公式结果解析失败或markdown为空", "error", err)
 			return nil, "", errors.New("markdown not found")
 		}
+		markdown = fc.Markdown
+	default:
+		log.Error(ctx, "func", "ExportTask", "msg", "不支持的导出任务类型", "task_type", recognitionResult.TaskType)
+		return nil, "", errors.New("unsupported task type for export")
+	}
 
 	// 获取文件名（去掉扩展名）
 	filename := strings.TrimSuffix(recognitionTask.FileName, "."+strings.ToLower(strings.Split(recognitionTask.FileName, ".")[len(strings.Split(recognitionTask.FileName, "."))-1]))

internal/storage/cache/pdf.go

@@ -0,0 +1,27 @@
+package cache
+
+import (
+	"context"
+	"strconv"
+)
+
+const (
+	PDFRecognitionTaskQueue = "pdf_recognition_queue"
+	PDFRecognitionDistLock  = "pdf_recognition_dist_lock"
+)
+
+func PushPDFTask(ctx context.Context, taskID int64) (int64, error) {
+	return RedisClient.LPush(ctx, PDFRecognitionTaskQueue, taskID).Result()
+}
+
+func PopPDFTask(ctx context.Context) (int64, error) {
+	result, err := RedisClient.BRPop(ctx, 0, PDFRecognitionTaskQueue).Result()
+	if err != nil {
+		return 0, err
+	}
+	return strconv.ParseInt(result[1], 10, 64)
+}
+
+func GetPDFDistributedLock(ctx context.Context) (bool, error) {
+	return RedisClient.SetNX(ctx, PDFRecognitionDistLock, "locked", DefaultLockTimeout).Result()
+}

internal/storage/dao/result.go

@@ -1,45 +1,104 @@
 package dao
 
 import (
+	"encoding/json"
+
 	"gorm.io/gorm"
 )
 
-type RecognitionResult struct {
+// FormulaContent 公式识别的 content 字段结构
-	BaseModel
+type FormulaContent struct {
-	TaskID   int64    `gorm:"column:task_id;bigint;not null;default:0;comment:任务ID" json:"task_id"`
+	Latex    string `json:"latex"`
-	TaskType TaskType `gorm:"column:task_type;varchar(16);not null;comment:任务类型;default:''" json:"task_type"`
+	Markdown string `json:"markdown"`
-	Latex    string   `json:"latex" gorm:"column:latex;type:text;not null;default:''"`
+	MathML   string `json:"mathml"`
-	Markdown string   `json:"markdown" gorm:"column:markdown;type:text;not null;default:''"` // Markdown 格式
+	MML      string `json:"mml"`
-	MathML   string   `json:"mathml" gorm:"column:mathml;type:text;not null;default:''"`     // MathML 格式
-	MML      string   `json:"mml" gorm:"column:mml;type:text;not null;default:''"`           // MML 格式
 }
 
-type RecognitionResultDao struct {
+// PDFPageContent PDF 单页识别结果
+type PDFPageContent struct {
+	PageNumber int    `json:"page_number"`
+	Markdown   string `json:"markdown"`
 }
 
+// ResultMetaData recognition_results.meta_data 字段结构
+type ResultMetaData struct {
+	TotalNum int `json:"total_num"`
+}
+
+// RecognitionResult recognition_results 表模型
+type RecognitionResult struct {
+	BaseModel
+	TaskID   int64    `gorm:"column:task_id;bigint;not null;default:0;index;comment:任务ID" json:"task_id"`
+	TaskType TaskType `gorm:"column:task_type;varchar(16);not null;comment:任务类型;default:''" json:"task_type"`
+	MetaData string   `gorm:"column:meta_data;type:json;comment:元数据" json:"meta_data"`
+	Content  string   `gorm:"column:content;type:json;comment:识别内容JSON" json:"content"`
+}
+
+// SetMetaData 序列化并写入 MetaData 字段
+func (r *RecognitionResult) SetMetaData(meta ResultMetaData) error {
+	b, err := json.Marshal(meta)
+	if err != nil {
+		return err
+	}
+	r.MetaData = string(b)
+	return nil
+}
+
+// GetFormulaContent 从 Content 字段反序列化公式结果
+func (r *RecognitionResult) GetFormulaContent() (*FormulaContent, error) {
+	var c FormulaContent
+	if err := json.Unmarshal([]byte(r.Content), &c); err != nil {
+		return nil, err
+	}
+	return &c, nil
+}
+
+// GetPDFContent 从 Content 字段反序列化 PDF 分页结果
+func (r *RecognitionResult) GetPDFContent() ([]PDFPageContent, error) {
+	var pages []PDFPageContent
+	if err := json.Unmarshal([]byte(r.Content), &pages); err != nil {
+		return nil, err
+	}
+	return pages, nil
+}
+
+// MarshalFormulaContent 将公式结果序列化为 JSON 字符串（供写入 Content）
+func MarshalFormulaContent(c FormulaContent) (string, error) {
+	b, err := json.Marshal(c)
+	return string(b), err
+}
+
+// MarshalPDFContent 将 PDF 分页结果序列化为 JSON 字符串（供写入 Content）
+func MarshalPDFContent(pages []PDFPageContent) (string, error) {
+	b, err := json.Marshal(pages)
+	return string(b), err
+}
+
+type RecognitionResultDao struct{}
+
 func NewRecognitionResultDao() *RecognitionResultDao {
 	return &RecognitionResultDao{}
 }
 
-// 模型方法
 func (dao *RecognitionResultDao) Create(tx *gorm.DB, data RecognitionResult) error {
 	return tx.Create(&data).Error
 }
 
-func (dao *RecognitionResultDao) GetByTaskID(tx *gorm.DB, taskID int64) (result *RecognitionResult, err error) {
+func (dao *RecognitionResultDao) GetByTaskID(tx *gorm.DB, taskID int64) (*RecognitionResult, error) {
-	result = &RecognitionResult{}
+	result := &RecognitionResult{}
-	err = tx.Where("task_id = ?", taskID).First(result).Error
+	err := tx.Where("task_id = ?", taskID).First(result).Error
 	if err != nil && err == gorm.ErrRecordNotFound {
 		return nil, nil
 	}
-	return
+	return result, err
-}
-
-func (dao *RecognitionResultDao) GetByTaskIDs(tx *gorm.DB, taskIDs []int64) (results []*RecognitionResult, err error) {
-	err = tx.Where("task_id IN (?)", taskIDs).Find(&results).Error
-	return
 }
 
 func (dao *RecognitionResultDao) Update(tx *gorm.DB, id int64, updates map[string]interface{}) error {
 	return tx.Model(&RecognitionResult{}).Where("id = ?", id).Updates(updates).Error
 }
+
+func (dao *RecognitionResultDao) GetByTaskIDs(tx *gorm.DB, taskIDs []int64) ([]*RecognitionResult, error) {
+	var results []*RecognitionResult
+	err := tx.Where("task_id IN (?)", taskIDs).Find(&results).Error
+	return results, err
+}

internal/storage/dao/task.go

@@ -20,6 +20,7 @@ const (
 	TaskTypeText    TaskType = "TEXT"
 	TaskTypeTable   TaskType = "TABLE"
 	TaskTypeLayout  TaskType = "LAYOUT"
+	TaskTypePDF     TaskType = "PDF"
 )
 
 func (t TaskType) String() string {

migrations/pdf_recognition.sql

@@ -0,0 +1,32 @@
+-- migrations/pdf_recognition.sql
+-- 将 recognition_results 表重构为 JSON content schema
+-- 执行顺序：加新列 → 洗历史数据 → 删旧列
+
+-- Step 1: 新增 JSON 字段（保留旧字段，等数据迁移完再删）
+ALTER TABLE `recognition_results`
+  ADD COLUMN `meta_data` JSON DEFAULT NULL COMMENT '元数据 {"total_num":1}' AFTER `task_type`,
+  ADD COLUMN `content`   JSON DEFAULT NULL COMMENT '识别内容 JSON' AFTER `meta_data`;
+
+-- Step 2: 将旧列数据洗入新 JSON 字段
+-- 所有现有记录均为 FORMULA 类型（单页），meta_data.total_num = 1
+-- content 结构: {"latex":"...","markdown":"...","mathml":"...","mml":"..."}
+UPDATE `recognition_results`
+SET
+  `meta_data` = JSON_OBJECT('total_num', 1),
+  `content`   = JSON_OBJECT(
+    'latex',    IFNULL(`latex`, ''),
+    'markdown', IFNULL(`markdown`, ''),
+    'mathml',   IFNULL(`mathml`, ''),
+    'mml',      IFNULL(`mml`, '')
+  )
+WHERE `content` IS NULL;
+
+-- Step 3: 验证数据洗涤完成（应返回 0）
+-- SELECT COUNT(*) FROM `recognition_results` WHERE `content` IS NULL;
+
+-- Step 4: 删除旧字段
+ALTER TABLE `recognition_results`
+  DROP COLUMN `latex`,
+  DROP COLUMN `markdown`,
+  DROP COLUMN `mathml`,
+  DROP COLUMN `mml`;