88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
package internal
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import (
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"errors"
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"io/fs"
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"math/rand"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"git.velvettear.de/velvettear/loggo"
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"git.velvettear.de/velvettear/slideshow-api/internal/config"
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)
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// map of images
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var images map[string]string
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// temporary map of images
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var tmpImages map[string]string
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// Scan the specified directory
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func Scan() {
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timestamp := time.Now()
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directory := config.Directory
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loggo.Info("scanning directory for images and subdirectories...", "interval: "+strconv.FormatFloat(config.ScanInterval.Seconds(), 'f', 0, 64)+" seconds", "directory: "+directory)
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tmpImages = make(map[string]string)
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filepath.WalkDir(directory, checkDirectory)
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images = tmpImages
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tmpImages = nil
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loggo.InfoTimed("found "+strconv.Itoa(len(images))+" image(s)", timestamp.UnixMilli())
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go scheduleRescan()
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}
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// get a random image
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func GetRandomImage() (string, error) {
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if len(images) == 0 {
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return "", errors.New("no images have been found in directory '" + config.Directory + "'")
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}
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random := rand.Intn(len(images))
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index := 0
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for key := range images {
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if index == random {
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return key, nil
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}
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index++
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}
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return "", errors.New("could not find a random image with index '" + strconv.Itoa(random) + "'")
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}
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// get the path of an image by name
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func GetImagePath(name string) (string, error) {
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var path string
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if len(name) == 0 {
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return path, errors.New("no image name provided")
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}
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image := images[name]
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if len(image) == 0 {
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return path, errors.New("could not find image '" + name + "' in internal map")
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}
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return image, nil
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}
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// sleep the specified interval and then trigger a rescan of the specified directory
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func scheduleRescan() {
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loggo.Debug("sleeping for " + strconv.FormatInt(config.ScanInterval.Milliseconds(), 10) + "ms before next scan...")
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time.Sleep(config.ScanInterval)
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Scan()
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}
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// add image files to the map of images
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func checkDirectory(path string, dir fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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if dir.IsDir() || !isImage(path) {
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return nil
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}
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tmpImages[filepath.Base(path)] = path
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loggo.Debug("added image to temporary map of images", path)
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return nil
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}
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// check if a file is an image
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func isImage(file string) bool {
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return strings.HasSuffix(file, ".jpeg") || strings.HasSuffix(file, ".jpg") || strings.HasSuffix(file, ".png")
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}
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