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package storage
import (
"bufio"
"bytes"
"code.laria.me/petrific/config"
"code.laria.me/petrific/objects"
"encoding/hex"
"fmt"
"io"
"os"
"strings"
)
func joinPath(parts ...string) string {
return strings.Join(parts, string(os.PathSeparator))
}
func objectDir(id objects.ObjectId) string {
return joinPath(string(id.Algo), hex.EncodeToString(id.Sum[0:1]))
}
type LocalStorage struct {
Path string
index map[objects.ObjectType]map[string]struct{}
}
func LocalStorageFromConfig(conf config.Config, name string) (Storage, error) {
var path string
if err := conf.Storage[name].Get("path", &path); err != nil {
return nil, err
}
return OpenLocalStorage(config.ExpandTilde(path))
}
func OpenLocalStorage(path string) (l LocalStorage, err error) {
l.Path = path
l.index = make(map[objects.ObjectType]map[string]struct{})
for _, t := range objects.AllObjectTypes {
l.index[t] = make(map[string]struct{})
}
if fi, err := os.Stat(path); os.IsNotExist(err) {
if err := os.MkdirAll(path, 0755); err != nil {
return l, err
}
} else if err != nil {
return l, err
} else if !fi.Mode().IsDir() {
return l, fmt.Errorf("%s: Not a directory", path)
}
f, err := os.Open(joinPath(path, "index"))
if err != nil {
if os.IsNotExist(err) {
err = nil
}
return l, err
}
if err == nil {
defer f.Close()
scan := bufio.NewScanner(f)
for scan.Scan() {
line := scan.Text()
parts := strings.SplitN(strings.TrimSpace(line), " ", 2)
if len(parts) == 2 {
id, err := objects.ParseObjectId(parts[1])
if err != nil {
return l, err
}
l.index[objects.ObjectType(parts[0])][id.String()] = struct{}{}
}
}
err = scan.Err()
}
return
}
func objectPath(id objects.ObjectId) string {
return joinPath(objectDir(id), hex.EncodeToString(id.Sum[1:]))
}
func (l LocalStorage) Get(id objects.ObjectId) ([]byte, error) {
f, err := os.Open(joinPath(l.Path, objectPath(id)))
if os.IsNotExist(err) {
return []byte{}, ObjectNotFound
} else if err != nil {
return []byte{}, err
}
defer f.Close()
buf := new(bytes.Buffer)
_, err = io.Copy(buf, f)
return buf.Bytes(), err
}
func (l LocalStorage) Has(id objects.ObjectId) (bool, error) {
_, err := os.Stat(joinPath(l.Path, objectPath(id)))
if err == nil {
return true, nil
} else if os.IsNotExist(err) {
return false, nil
} else {
return false, err
}
}
func (l LocalStorage) Set(id objects.ObjectId, typ objects.ObjectType, raw []byte) error {
// First, check if the directory exists
dir := joinPath(l.Path, objectDir(id))
_, err := os.Stat(dir)
if os.IsNotExist(err) {
if err := os.MkdirAll(dir, 0755); err != nil {
return err
}
} else if err != nil {
return err
}
f, err := os.Create(joinPath(l.Path, objectPath(id)))
if err != nil {
return err
}
defer f.Close()
_, err = f.Write(raw)
l.index[typ][id.String()] = struct{}{}
return err
}
func (l LocalStorage) List(typ objects.ObjectType) ([]objects.ObjectId, error) {
ids := make([]objects.ObjectId, 0, len(l.index[typ]))
for id := range l.index[typ] {
ids = append(ids, objects.MustParseObjectId(id))
}
return ids, nil
}
func (l LocalStorage) Close() (outerr error) {
f, err := os.Create(joinPath(l.Path, "index"))
if err != nil {
return err
}
defer f.Close()
for t, objs := range l.index {
for id := range objs {
if _, err := fmt.Fprintf(f, "%s %s\n", t, id); err != nil {
return err
}
}
}
return nil
}
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