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package main
/* This example uses a more advanced transform function that simulates a bit
how Git stores objects:
* places hash-like keys under the objects directory
* any other key is placed in the base directory. If the key
* contains slashes, these are converted to subdirectories
*/
import (
"fmt"
"regexp"
"strings"
"github.com/peterbourgon/diskv/v3"
)
var hex40 = regexp.MustCompile("[0-9a-fA-F]{40}")
func hexTransform(s string) *diskv.PathKey {
if hex40.MatchString(s) {
return &diskv.PathKey{Path: []string{"objects", s[0:2]},
FileName: s,
}
}
folders := strings.Split(s, "/")
lfolders := len(folders)
if lfolders > 1 {
return &diskv.PathKey{Path: folders[:lfolders-1],
FileName: folders[lfolders-1],
}
}
return &diskv.PathKey{Path: []string{},
FileName: s,
}
}
func hexInverseTransform(pathKey *diskv.PathKey) string {
if hex40.MatchString(pathKey.FileName) {
return pathKey.FileName
}
if len(pathKey.Path) == 0 {
return pathKey.FileName
}
return strings.Join(pathKey.Path, "/") + "/" + pathKey.FileName
}
func main() {
d := diskv.New(diskv.Options{
BasePath: "my-data-dir",
AdvancedTransform: hexTransform,
InverseTransform: hexInverseTransform,
CacheSizeMax: 1024 * 1024,
})
// Write some text to the key "alpha/beta/gamma".
key := "1bd88421b055327fcc8660c76c4894c4ea4c95d7"
d.WriteString(key, "¡Hola!") // will be stored in "<basedir>/objects/1b/1bd88421b055327fcc8660c76c4894c4ea4c95d7"
d.WriteString("refs/heads/master", "some text") // will be stored in "<basedir>/refs/heads/master"
fmt.Println("Enumerating All keys:")
c := d.Keys(nil)
for key := range c {
value := d.ReadString(key)
fmt.Printf("Key: %s, Value: %s\n", key, value)
}
}
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