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// Copyright 2021 Nick White.
// Use of this source code is governed by the GPLv3
// license that can be found in the LICENSE file.
package pipeline
import (
"fmt"
"image"
_ "image/jpeg"
_ "image/png"
"os"
"path/filepath"
"strings"
)
// null writer to enable non-verbose logging to be discarded
type NullWriter bool
func (w NullWriter) Write(p []byte) (n int, err error) {
return len(p), nil
}
type fileWalk chan string
// Walk sends the path of all files to the channel, with the exception of
// any file which starts with "."
func (f fileWalk) Walk(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
// skip files starting with . to prevent automatically generated
// files like .DS_Store getting in the way
if strings.HasPrefix(filepath.Base(path), ".") {
return nil
}
if !info.IsDir() {
f <- path
}
return nil
}
// CheckImages checks that all files in a directory are images
// that can be decoded (skipping dotfiles)
func CheckImages(dir string) error {
checker := make(fileWalk)
go func() {
_ = filepath.Walk(dir, checker.Walk)
close(checker)
}()
for path := range checker {
f, err := os.Open(path)
if err != nil {
return fmt.Errorf("Opening image %s failed: %v", path, err)
}
_, _, err = image.Decode(f)
if err != nil {
return fmt.Errorf("Decoding image %s failed: %v", path, err)
}
}
return nil
}
// DetectQueueType detects which queue to use based on the preponderance
// of files of a particular extension in a directory
func DetectQueueType(dir string, conn Queuer) string {
pngdirs, _ := filepath.Glob(dir + "/*.png")
jpgdirs, _ := filepath.Glob(dir + "/*.jpg")
pngcount := len(pngdirs)
jpgcount := len(jpgdirs)
if pngcount > jpgcount {
return conn.WipeQueueId()
} else {
return conn.PreQueueId()
}
}
// UploadImages uploads all files (except those which start with a ".")
// from a directory (recursively) into a given storage id, prefixed with
// the given bookname and a slash
func UploadImages(dir string, bookname string, conn Uploader, storageId string) error {
walker := make(fileWalk)
go func() {
_ = filepath.Walk(dir, walker.Walk)
close(walker)
}()
for path := range walker {
name := filepath.Base(path)
err := conn.Upload(storageId, bookname + "/" + name, path)
if err != nil {
return fmt.Errorf("Failed to upload %s: %v", path, err)
}
}
return nil
}
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