/
service.go
125 lines (104 loc) · 3.54 KB
/
service.go
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package service
import (
"context"
"strings"
"github.com/Falokut/images_storage_service/internal/models"
"github.com/Falokut/images_storage_service/internal/repository"
"github.com/gabriel-vasile/mimetype"
"github.com/google/uuid"
"github.com/sirupsen/logrus"
)
type Config struct {
MaxImageSize int
}
//go:generate mockgen -source=service.go -destination=mocks/service.go
type Metrics interface {
IncBytesUploaded(bytesUploaded int)
}
//go:generate mockgen -source=service.go -destination=mocks/service.go
type ImagesStorageService interface {
SaveImage(ctx context.Context, img []byte, category string) (string, error)
GetImage(ctx context.Context, imageId string, category string) ([]byte, error)
IsImageExist(ctx context.Context, imageId string, category string) (bool, error)
DeleteImage(ctx context.Context, imageId string, category string) error
RewriteImage(ctx context.Context, img []byte, imageId string, category string, createImageIfNotExist bool) (string, error)
}
type imagesStorageService struct {
logger *logrus.Logger
metrics Metrics
storage repository.ImageStorage
cfg Config
}
func NewImagesStorageService(logger *logrus.Logger,
metrics Metrics,
storage repository.ImageStorage,
cfg Config) ImagesStorageService {
return &imagesStorageService{
logger: logger,
metrics: metrics,
storage: storage,
cfg: cfg,
}
}
func (s *imagesStorageService) detectFileType(fileData []byte) string {
fileType := mimetype.Detect(fileData)
Type := strings.Split(fileType.String(), "/")
return Type[0]
}
func (s *imagesStorageService) SaveImage(ctx context.Context, img []byte, category string) (imageId string, err error) {
if err = s.checkImage(img); err != nil {
return
}
imageId = uuid.NewString()
err = s.storage.SaveImage(ctx, img, imageId, category)
if err != nil {
return
}
s.metrics.IncBytesUploaded(len(img))
return
}
func (s *imagesStorageService) GetImage(ctx context.Context, imageId string, category string) ([]byte, error) {
return s.storage.GetImage(ctx, imageId, category)
}
func (s *imagesStorageService) IsImageExist(ctx context.Context, imageId string, category string) (bool, error) {
return s.storage.IsImageExist(ctx, imageId, category)
}
func (s *imagesStorageService) DeleteImage(ctx context.Context, imageId string, category string) error {
return s.storage.DeleteImage(ctx, imageId, category)
}
func (s *imagesStorageService) RewriteImage(ctx context.Context, img []byte, imageId string,
category string, createImageIfNotExist bool) (newImageId string, err error) {
if err = s.checkImage(img); err != nil {
return
}
imageExist, err := s.storage.IsImageExist(ctx, imageId, category)
if err != nil {
return
}
if !createImageIfNotExist && !imageExist {
err = models.Error(models.NotFound, "can't find image with specified id")
return
}
if !imageExist && createImageIfNotExist {
newImageId = uuid.NewString()
err = s.storage.SaveImage(ctx, img, newImageId, category)
return
}
err = s.storage.RewriteImage(ctx, img, imageId, category)
return
}
func (s *imagesStorageService) checkImage(image []byte) error {
if len(image) == 0 {
return models.Error(models.InvalidArgument, "the received file has zero size")
}
if len(image) > s.cfg.MaxImageSize {
return models.Errorf(models.InvalidArgument,
"image is too large max image size: %d, file size: %d",
s.cfg.MaxImageSize, len(image))
}
s.logger.Info("Checking filetype")
if fileType := s.detectFileType(image); fileType != "image" {
return models.Error(models.InvalidArgument, "the received file type is not supported")
}
return nil
}