fix ocr

.gitignore

@@ -1,2 +1,3 @@
 client/testdata
-client/thumbnail
+client/thumbnail
+client/ocr

client/main.go

@@ -29,21 +29,29 @@ func main() {
 	}
 	client := pb.NewThumbnailServiceClient(conn)
 	filePath := []thingy{
-		{pb.FileType_IMAGE, "testdata/image-sample.png"},
+		//{pb.FileType_IMAGE, "testdata/image-sample.png"},
 		{pb.FileType_PDF, "testdata/pdf-sample.pdf"},
-		{pb.FileType_VIDEO, "testdata/video-sample.webm"}}
+		{pb.FileType_PDF, "testdata/blitzer.pdf"},
-
+		//{pb.FileType_VIDEO, "testdata/video-sample.webm"}
-	a := sync.WaitGroup{}
-
-	for _, f := range filePath {
-		a.Add(1)
-		go func() {
-			createPreview(f.Path, f.Type, client)
-			a.Done()
-		}()
 	}
 
-	a.Wait()
+	wg := sync.WaitGroup{}
+
+	for _, f := range filePath {
+		wg.Add(2)
+		go func() {
+			defer wg.Done()
+			createPreview(f.Path, f.Type, client)
+		}()
+
+		go func(f thingy) {
+			defer wg.Done()
+			createOCR(f.Path, f.Type, client)
+		}(f)
+	}
+
+	wg.Wait()
+
 }
 
 func createPreview(filePath string, ftype pb.FileType, client pb.ThumbnailServiceClient) {
@@ -78,6 +86,40 @@ func createPreview(filePath string, ftype pb.FileType, client pb.ThumbnailServic
 	}
 }
 
+func createOCR(filePath string, ftype pb.FileType, client pb.ThumbnailServiceClient) {
+	fileContent, err := os.ReadFile(filePath)
+	if err != nil {
+		log.Printf("Error reading file: %v", err)
+		return
+	}
+
+	req := &pb.OCRFileRequest{
+		FileContent: fileContent,
+		FileType:    ftype,
+		CleanUp:     true,
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 60000*time.Second)
+	defer cancel()
+
+	resp, err := client.OcrFile(ctx, req)
+	if err != nil {
+		log.Printf("Error calling OcrDocument: %v", err)
+		return
+	}
+
+	fmt.Printf("[OCR] %s: %s\n %s", filePath, resp.Message, resp.TextContent)
+
+	if len(resp.OcrContent) > 0 {
+		err := saveToFile([]byte(resp.OcrContent), filePath, "ocr", ".pdf")
+		if err != nil {
+			log.Printf("Error saving OCR text to file: %v", err)
+		} else {
+			fmt.Println("OCR text saved successfully.")
+		}
+	}
+}
+
 // Function to save the thumbnail content to a file in the 'thumbnail/' directory
 func saveThumbnailToFile(thumbnailContent []byte, filePath string) error {
 	// Ensure the "thumbnail" directory exists
@@ -97,3 +139,21 @@ func saveThumbnailToFile(thumbnailContent []byte, filePath string) error {
 
 	return nil
 }
+
+func saveToFile(data []byte, originalPath, folder, ext string) error {
+	err := os.MkdirAll(folder, os.ModePerm)
+	if err != nil {
+		return fmt.Errorf("failed to create directory: %v", err)
+	}
+
+	baseName := filepath.Base(originalPath)
+	fileName := strings.TrimSuffix(baseName, filepath.Ext(baseName))
+
+	fullPath := filepath.Join(folder, fileName+ext)
+	err = os.WriteFile(fullPath, data, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to save file: %v", err)
+	}
+
+	return nil
+}

client/proto/thumbnail.pb.go

@@ -345,9 +345,10 @@ const file_thumbnail_proto_rawDesc = "" +
 	"\x15FILE_TYPE_UNSPECIFIED\x10\x00\x12\t\n" +
 	"\x05IMAGE\x10\x01\x12\t\n" +
 	"\x05VIDEO\x10\x02\x12\a\n" +
-	"\x03PDF\x10\x032r\n" +
+	"\x03PDF\x10\x032\xc4\x01\n" +
 	"\x10ThumbnailService\x12^\n" +
-	"\x11GenerateThumbnail\x12#.thumbnail_service.ThumbnailRequest\x1a$.thumbnail_service.ThumbnailResponseB\tZ\a./protob\x06proto3"
+	"\x11GenerateThumbnail\x12#.thumbnail_service.ThumbnailRequest\x1a$.thumbnail_service.ThumbnailResponse\x12P\n" +
+	"\aOcrFile\x12!.thumbnail_service.OCRFileRequest\x1a\".thumbnail_service.OCRFileResponseB\tZ\a./protob\x06proto3"
 
 var (
 	file_thumbnail_proto_rawDescOnce sync.Once
@@ -374,9 +375,11 @@ var file_thumbnail_proto_depIdxs = []int32{
 	0, // 0: thumbnail_service.ThumbnailRequest.file_type:type_name -> thumbnail_service.FileType
 	0, // 1: thumbnail_service.OCRFileRequest.file_type:type_name -> thumbnail_service.FileType
 	1, // 2: thumbnail_service.ThumbnailService.GenerateThumbnail:input_type -> thumbnail_service.ThumbnailRequest
-	2, // 3: thumbnail_service.ThumbnailService.GenerateThumbnail:output_type -> thumbnail_service.ThumbnailResponse
+	3, // 3: thumbnail_service.ThumbnailService.OcrFile:input_type -> thumbnail_service.OCRFileRequest
-	3, // [3:4] is the sub-list for method output_type
+	2, // 4: thumbnail_service.ThumbnailService.GenerateThumbnail:output_type -> thumbnail_service.ThumbnailResponse
-	2, // [2:3] is the sub-list for method input_type
+	4, // 5: thumbnail_service.ThumbnailService.OcrFile:output_type -> thumbnail_service.OCRFileResponse
+	4, // [4:6] is the sub-list for method output_type
+	2, // [2:4] is the sub-list for method input_type
 	2, // [2:2] is the sub-list for extension type_name
 	2, // [2:2] is the sub-list for extension extendee
 	0, // [0:2] is the sub-list for field type_name

client/proto/thumbnail_grpc.pb.go

@@ -20,6 +20,7 @@ const _ = grpc.SupportPackageIsVersion9
 
 const (
 	ThumbnailService_GenerateThumbnail_FullMethodName = "/thumbnail_service.ThumbnailService/GenerateThumbnail"
+	ThumbnailService_OcrFile_FullMethodName           = "/thumbnail_service.ThumbnailService/OcrFile"
 )
 
 // ThumbnailServiceClient is the client API for ThumbnailService service.
@@ -29,6 +30,7 @@ const (
 // Service definition
 type ThumbnailServiceClient interface {
 	GenerateThumbnail(ctx context.Context, in *ThumbnailRequest, opts ...grpc.CallOption) (*ThumbnailResponse, error)
+	OcrFile(ctx context.Context, in *OCRFileRequest, opts ...grpc.CallOption) (*OCRFileResponse, error)
 }
 
 type thumbnailServiceClient struct {
@@ -49,6 +51,16 @@ func (c *thumbnailServiceClient) GenerateThumbnail(ctx context.Context, in *Thum
 	return out, nil
 }
 
+func (c *thumbnailServiceClient) OcrFile(ctx context.Context, in *OCRFileRequest, opts ...grpc.CallOption) (*OCRFileResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(OCRFileResponse)
+	err := c.cc.Invoke(ctx, ThumbnailService_OcrFile_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // ThumbnailServiceServer is the server API for ThumbnailService service.
 // All implementations must embed UnimplementedThumbnailServiceServer
 // for forward compatibility.
@@ -56,6 +68,7 @@ func (c *thumbnailServiceClient) GenerateThumbnail(ctx context.Context, in *Thum
 // Service definition
 type ThumbnailServiceServer interface {
 	GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error)
+	OcrFile(context.Context, *OCRFileRequest) (*OCRFileResponse, error)
 	mustEmbedUnimplementedThumbnailServiceServer()
 }
 
@@ -69,6 +82,9 @@ type UnimplementedThumbnailServiceServer struct{}
 func (UnimplementedThumbnailServiceServer) GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GenerateThumbnail not implemented")
 }
+func (UnimplementedThumbnailServiceServer) OcrFile(context.Context, *OCRFileRequest) (*OCRFileResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method OcrFile not implemented")
+}
 func (UnimplementedThumbnailServiceServer) mustEmbedUnimplementedThumbnailServiceServer() {}
 func (UnimplementedThumbnailServiceServer) testEmbeddedByValue()                          {}
 
@@ -108,6 +124,24 @@ func _ThumbnailService_GenerateThumbnail_Handler(srv interface{}, ctx context.Co
 	return interceptor(ctx, in, info, handler)
 }
 
+func _ThumbnailService_OcrFile_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(OCRFileRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ThumbnailServiceServer).OcrFile(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ThumbnailService_OcrFile_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ThumbnailServiceServer).OcrFile(ctx, req.(*OCRFileRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // ThumbnailService_ServiceDesc is the grpc.ServiceDesc for ThumbnailService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -119,6 +153,10 @@ var ThumbnailService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "GenerateThumbnail",
 			Handler:    _ThumbnailService_GenerateThumbnail_Handler,
 		},
+		{
+			MethodName: "OcrFile",
+			Handler:    _ThumbnailService_OcrFile_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "thumbnail.proto",

server/Dockerfile

@@ -1,12 +1,15 @@
-FROM golang:1.24.1
+FROM golang:1.24.2
 
 WORKDIR /app
 
 RUN apt-get update && apt-get install -y \
     imagemagick \
     ffmpeg \
-    poppler-utils && \
+    poppler-utils \
-    rm -rf /var/lib/apt/lists/*
+    ocrmypdf \
+    qpdf \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 
 COPY . .
 

server/go.mod

@@ -4,6 +4,7 @@ go 1.24.1
 
 require (
 	github.com/google/uuid v1.6.0
+	github.com/ledongthuc/pdf v0.0.0-20240201131950-da5b75280b06
 	github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646
 	google.golang.org/grpc v1.71.0
 	google.golang.org/protobuf v1.36.6

server/go.sum

@@ -8,6 +8,8 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 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=
+github.com/ledongthuc/pdf v0.0.0-20240201131950-da5b75280b06 h1:kacRlPN7EN++tVpGUorNGPn/4DnB7/DfTY82AOn6ccU=
+github.com/ledongthuc/pdf v0.0.0-20240201131950-da5b75280b06/go.mod h1:imJHygn/1yfhB7XSJJKlFZKl/J+dCPAknuiaGOshXAs=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646 h1:zYyBkD/k9seD2A7fsi6Oo2LfFZAehjjQMERAvZLEDnQ=
 github.com/nfnt/resize v0.0.0-20180221191011-83c6a9932646/go.mod h1:jpp1/29i3P1S/RLdc7JQKbRpFeM1dOBd8T9ki5s+AY8=
 go.opentelemetry.io/auto/sdk v1.1.0 h1:cH53jehLUN6UFLY71z+NDOiNJqDdPRaXzTel0sJySYA=

server/main.go

@@ -2,8 +2,10 @@ package main
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"image"
+	"io"
 	"log"
 	"net"
 	"os"
@@ -20,6 +22,7 @@ import (
 
 	pb "github.com/JuLi0n21/thumbnail_service/proto"
 	"github.com/google/uuid"
+	"github.com/ledongthuc/pdf"
 	"github.com/nfnt/resize"
 	"google.golang.org/grpc"
 )
@@ -170,6 +173,8 @@ func (s *server) GenerateThumbnail(ctx context.Context, req *pb.ThumbnailRequest
 		if _, err := os.Stat(outputPath); err == nil {
 			os.Remove(outputPath)
 		}
+		end := time.Since(time.Now())
+		fmt.Println(time.Now().Format("2006-01-02 15:04:05.000"), "Finshed in: ", end, req.FileType, "H: ", req.MaxHeight, "W: ", req.MaxWidth)
 	}()
 
 	thumbnailContent, err := os.ReadFile(outputPath)
@@ -177,58 +182,229 @@ func (s *server) GenerateThumbnail(ctx context.Context, req *pb.ThumbnailRequest
 		return nil, fmt.Errorf("failed to read generated thumbnail: %v", err)
 	}
 
-	end := time.Since(time.Now())
-	fmt.Println(time.Now().Format("2006-01-02 15:04:05.000"), "Finshed in: ", end, req.FileType, "H: ", req.MaxHeight, "W: ", req.MaxWidth)
 	return &pb.ThumbnailResponse{
 		Message:          "Thumbnail generated successfully",
 		ThumbnailContent: thumbnailContent,
 	}, nil
 }
 
-func (s *server) OCRFile(ctx context.Context, req *pb.OCRFileRequest) (*pb.OCRFileResponse, error) {
+func (s *server) OcrFile(ctx context.Context, req *pb.OCRFileRequest) (*pb.OCRFileResponse, error) {
+	start := time.Now()
+	fmt.Println(start.Format("2006-01-02 15:04:05.000"), "OCR request ", req.FileType)
 
-	//save to disk
+	defer func() {
+		end := time.Since(time.Now())
+		fmt.Println(time.Now().Format("2006-01-02 15:04:05.000"), "OCR Finshed in: ", end, req.FileType)
+	}()
+	if req.FileType != pb.FileType_PDF {
+		err := errors.New("unsupported Filetype " + req.FileType.String())
+		return &pb.OCRFileResponse{
+			Message:     "OCR failed, " + err.Error(),
+			TextContent: "",
+			OcrContent:  []byte{},
+		}, err
+	}
+	file, err := os.CreateTemp("ocr", "temp-file-*")
+	if err != nil {
+		return &pb.OCRFileResponse{
+			Message:     "OCR failed, " + err.Error(),
+			TextContent: "",
+			OcrContent:  []byte{},
+		}, err
+	}
+	filePath := file.Name()
+	defer func(file *os.File, filePath string) {
+		file.Close()
 
-	//do preprocessing
+		err = os.Remove(file.Name())
+		if err != nil {
+			fmt.Println(err.Error())
+		}
+	}(file, filePath)
 
-	//extract information...
+	_, err = file.Write(req.FileContent)
+	if err != nil {
+		return &pb.OCRFileResponse{
+			Message:     "OCR failed, " + err.Error(),
+			TextContent: "",
+			OcrContent:  []byte{},
+		}, err
+	}
+
+	if ok, err := isScannedPDF(filePath); err != nil {
+		return &pb.OCRFileResponse{
+			Message:     "OCR failed, " + err.Error(),
+			TextContent: "",
+			OcrContent:  []byte{},
+		}, err
+	} else if !ok {
+		if isEncrypted(filePath) {
+			err := decryptPDF(filePath)
+			if err != nil {
+				return &pb.OCRFileResponse{
+					Message:     "OCR failed, " + err.Error(),
+					TextContent: "",
+					OcrContent:  []byte{},
+				}, err
+			}
+		}
+
+		err = runOCRMyPDF(filePath)
+		if err != nil {
+			return &pb.OCRFileResponse{
+				Message:     "OCR failed, " + err.Error(),
+				TextContent: "",
+				OcrContent:  []byte{},
+			}, err
+		}
+	}
+
+	var text string
+	var b []byte
+	text, b, err = extractTextFromPDF(filePath)
+	if err != nil {
+
+		if strings.Contains("malformed pdf", err.Error()) {
+			repairPDF(filePath)
+			text, b, err = extractTextFromPDF(filePath)
+
+		} else {
+			return &pb.OCRFileResponse{
+				Message:     "OCR failed, " + err.Error(),
+				TextContent: "",
+				OcrContent:  []byte{},
+			}, err
+		}
+	}
 
-	//return stuff
 	return &pb.OCRFileResponse{
-		Message:     "OCRed successfully",
+		Message:     "OCR success",
-		TextContent: "",
+		TextContent: text,
-		OcrContent:  []byte{},
+		OcrContent:  b,
 	}, nil
 }
 
-func isScannedPDF(filePath string) bool {
+func isScannedPDF(path string) (bool, error) {
-	cmd := exec.Command("pdftotext", filePath, "-")
+	f, r, err := pdf.Open(path)
-	out, err := cmd.Output()
 	if err != nil {
-		log.Printf("pdftotext error for %s: %v", filePath, err)
+		return false, fmt.Errorf("failed to open PDF: %w", err)
-		return false
 	}
-	return len(strings.TrimSpace(string(out))) == 0
+	defer f.Close()
+
+	reader, err := r.GetPlainText()
+	if err != nil {
+		return false, fmt.Errorf("failed to get PDF text: %w", err)
+	}
+
+	content, err := io.ReadAll(reader)
+	if err != nil {
+		return false, fmt.Errorf("failed to read PDF content: %w", err)
+	}
+
+	return len(strings.TrimSpace(string(content))) != 0, nil
 }
 
-func runOCRMyPDF(inputPath, outputPath string) error {
+func runOCRMyPDF(inputPath string) error {
-	cmd := exec.Command("ocrmypdf", "--skip-text", inputPath, outputPath)
+	tempfile, err := os.CreateTemp("", "temp-ocr-*.pdf")
+	defer os.Remove(tempfile.Name())
+	if err != nil {
+		return err
+	}
+	cmd := exec.Command("ocrmypdf", "--skip-text", inputPath, tempfile.Name())
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		return fmt.Errorf("ocrmypdf failed: %v\nOutput: %s", err, output)
 	}
+
+	processedData, err := os.ReadFile(tempfile.Name())
+	if err != nil {
+		return fmt.Errorf("failed to read processed file: %v", err)
+	}
+
+	err = os.WriteFile(inputPath, processedData, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to overwrite input file: %v", err)
+	}
 	return nil
 }
 
-func decryptPDF(inputPath, outputPath string) error {
+func isEncrypted(pdfPath string) bool {
-	cmd := exec.Command("qpdf", "--decrypt", inputPath, outputPath)
+	cmd := exec.Command("qpdf", "--check", pdfPath)
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return strings.Contains(string(output), "File is not encrypted")
+	}
+	return false
+}
+
+func repairPDF(inputPath string) error {
+	tempfile, err := os.CreateTemp("", "")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(tempfile.Name())
+
+	cmd := exec.Command("qpdf", "--repair", inputPath, tempfile.Name())
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		return err
+	}
+
+	_, err = tempfile.Write(output)
+
+	return err
+}
+
+func decryptPDF(inputPath string) error {
+	tempfile, err := os.CreateTemp("", "")
+	if err != nil {
+		return err
+	}
+	defer os.Remove(tempfile.Name())
+
+	cmd := exec.Command("qpdf", "--decrypt", inputPath, tempfile.Name())
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		return fmt.Errorf("qpdf failed: %v\nOutput: %s", err, output)
 	}
+
+	processedData, err := os.ReadFile(tempfile.Name())
+	if err != nil {
+		return fmt.Errorf("failed to read processed file: %v", err)
+	}
+
+	err = os.WriteFile(inputPath, processedData, 0644)
+	if err != nil {
+		return fmt.Errorf("failed to overwrite input file: %v", err)
+	}
 	return nil
 }
 
+func extractTextFromPDF(path string) (string, []byte, error) {
+	f, r, err := pdf.Open(path)
+	if err != nil {
+		return "", []byte{}, fmt.Errorf("failed to open PDF: %w", err)
+	}
+	defer f.Close()
+
+	reader, err := r.GetPlainText()
+	if err != nil {
+		return "", []byte{}, fmt.Errorf("failed to get PDF text: %w", err)
+	}
+
+	content, err := io.ReadAll(reader)
+	if err != nil {
+		return "", []byte{}, fmt.Errorf("failed to read PDF content: %w", err)
+	}
+
+	rawData, err := os.ReadFile(path)
+	if err != nil {
+		return "", nil, fmt.Errorf("failed to read raw PDF file: %w", err)
+	}
+
+	return string(content), rawData, nil
+}
+
 const maxMsgSize = 2147483648 // 2GB
 
 func main() {

server/proto/thumbnail.pb.go

@@ -345,9 +345,10 @@ const file_thumbnail_proto_rawDesc = "" +
 	"\x15FILE_TYPE_UNSPECIFIED\x10\x00\x12\t\n" +
 	"\x05IMAGE\x10\x01\x12\t\n" +
 	"\x05VIDEO\x10\x02\x12\a\n" +
-	"\x03PDF\x10\x032r\n" +
+	"\x03PDF\x10\x032\xc4\x01\n" +
 	"\x10ThumbnailService\x12^\n" +
-	"\x11GenerateThumbnail\x12#.thumbnail_service.ThumbnailRequest\x1a$.thumbnail_service.ThumbnailResponseB\tZ\a./protob\x06proto3"
+	"\x11GenerateThumbnail\x12#.thumbnail_service.ThumbnailRequest\x1a$.thumbnail_service.ThumbnailResponse\x12P\n" +
+	"\aOcrFile\x12!.thumbnail_service.OCRFileRequest\x1a\".thumbnail_service.OCRFileResponseB\tZ\a./protob\x06proto3"
 
 var (
 	file_thumbnail_proto_rawDescOnce sync.Once
@@ -374,9 +375,11 @@ var file_thumbnail_proto_depIdxs = []int32{
 	0, // 0: thumbnail_service.ThumbnailRequest.file_type:type_name -> thumbnail_service.FileType
 	0, // 1: thumbnail_service.OCRFileRequest.file_type:type_name -> thumbnail_service.FileType
 	1, // 2: thumbnail_service.ThumbnailService.GenerateThumbnail:input_type -> thumbnail_service.ThumbnailRequest
-	2, // 3: thumbnail_service.ThumbnailService.GenerateThumbnail:output_type -> thumbnail_service.ThumbnailResponse
+	3, // 3: thumbnail_service.ThumbnailService.OcrFile:input_type -> thumbnail_service.OCRFileRequest
-	3, // [3:4] is the sub-list for method output_type
+	2, // 4: thumbnail_service.ThumbnailService.GenerateThumbnail:output_type -> thumbnail_service.ThumbnailResponse
-	2, // [2:3] is the sub-list for method input_type
+	4, // 5: thumbnail_service.ThumbnailService.OcrFile:output_type -> thumbnail_service.OCRFileResponse
+	4, // [4:6] is the sub-list for method output_type
+	2, // [2:4] is the sub-list for method input_type
 	2, // [2:2] is the sub-list for extension type_name
 	2, // [2:2] is the sub-list for extension extendee
 	0, // [0:2] is the sub-list for field type_name

server/proto/thumbnail_grpc.pb.go

@@ -20,6 +20,7 @@ const _ = grpc.SupportPackageIsVersion9
 
 const (
 	ThumbnailService_GenerateThumbnail_FullMethodName = "/thumbnail_service.ThumbnailService/GenerateThumbnail"
+	ThumbnailService_OcrFile_FullMethodName           = "/thumbnail_service.ThumbnailService/OcrFile"
 )
 
 // ThumbnailServiceClient is the client API for ThumbnailService service.
@@ -29,6 +30,7 @@ const (
 // Service definition
 type ThumbnailServiceClient interface {
 	GenerateThumbnail(ctx context.Context, in *ThumbnailRequest, opts ...grpc.CallOption) (*ThumbnailResponse, error)
+	OcrFile(ctx context.Context, in *OCRFileRequest, opts ...grpc.CallOption) (*OCRFileResponse, error)
 }
 
 type thumbnailServiceClient struct {
@@ -49,6 +51,16 @@ func (c *thumbnailServiceClient) GenerateThumbnail(ctx context.Context, in *Thum
 	return out, nil
 }
 
+func (c *thumbnailServiceClient) OcrFile(ctx context.Context, in *OCRFileRequest, opts ...grpc.CallOption) (*OCRFileResponse, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(OCRFileResponse)
+	err := c.cc.Invoke(ctx, ThumbnailService_OcrFile_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // ThumbnailServiceServer is the server API for ThumbnailService service.
 // All implementations must embed UnimplementedThumbnailServiceServer
 // for forward compatibility.
@@ -56,6 +68,7 @@ func (c *thumbnailServiceClient) GenerateThumbnail(ctx context.Context, in *Thum
 // Service definition
 type ThumbnailServiceServer interface {
 	GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error)
+	OcrFile(context.Context, *OCRFileRequest) (*OCRFileResponse, error)
 	mustEmbedUnimplementedThumbnailServiceServer()
 }
 
@@ -69,6 +82,9 @@ type UnimplementedThumbnailServiceServer struct{}
 func (UnimplementedThumbnailServiceServer) GenerateThumbnail(context.Context, *ThumbnailRequest) (*ThumbnailResponse, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method GenerateThumbnail not implemented")
 }
+func (UnimplementedThumbnailServiceServer) OcrFile(context.Context, *OCRFileRequest) (*OCRFileResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method OcrFile not implemented")
+}
 func (UnimplementedThumbnailServiceServer) mustEmbedUnimplementedThumbnailServiceServer() {}
 func (UnimplementedThumbnailServiceServer) testEmbeddedByValue()                          {}
 
@@ -108,6 +124,24 @@ func _ThumbnailService_GenerateThumbnail_Handler(srv interface{}, ctx context.Co
 	return interceptor(ctx, in, info, handler)
 }
 
+func _ThumbnailService_OcrFile_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(OCRFileRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ThumbnailServiceServer).OcrFile(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ThumbnailService_OcrFile_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ThumbnailServiceServer).OcrFile(ctx, req.(*OCRFileRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // ThumbnailService_ServiceDesc is the grpc.ServiceDesc for ThumbnailService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -119,6 +153,10 @@ var ThumbnailService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "GenerateThumbnail",
 			Handler:    _ThumbnailService_GenerateThumbnail_Handler,
 		},
+		{
+			MethodName: "OcrFile",
+			Handler:    _ThumbnailService_OcrFile_Handler,
+		},
 	},
 	Streams:  []grpc.StreamDesc{},
 	Metadata: "thumbnail.proto",

thumbnail.proto

@@ -15,6 +15,7 @@ enum FileType {
 // Service definition
 service ThumbnailService {
     rpc GenerateThumbnail(ThumbnailRequest) returns (ThumbnailResponse);
+    rpc OcrFile(OCRFileRequest) returns (OCRFileResponse);
 }
 
 // Request message for generating thumbnails