Add Inner Ring code

pkg/local_object_storage/bucket/fsbucket/methods.go

@@ -0,0 +1,107 @@
+package fsbucket
+
+import (
+	"io/ioutil"
+	"os"
+	"path"
+	"path/filepath"
+
+	"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/bucket"
+)
+
+// Get value by key.
+func (b *Bucket) Get(key []byte) ([]byte, error) {
+	p := path.Join(b.dir, stringifyKey(key))
+	if _, err := os.Stat(p); os.IsNotExist(err) {
+		return nil, bucket.ErrNotFound
+	}
+
+	return ioutil.ReadFile(p)
+}
+
+// Set value by key.
+func (b *Bucket) Set(key, value []byte) error {
+	p := path.Join(b.dir, stringifyKey(key))
+
+	return ioutil.WriteFile(p, value, b.perm)
+}
+
+// Del value by key.
+func (b *Bucket) Del(key []byte) error {
+	p := path.Join(b.dir, stringifyKey(key))
+	if _, err := os.Stat(p); os.IsNotExist(err) {
+		return bucket.ErrNotFound
+	}
+
+	return os.Remove(p)
+}
+
+// Has checks key exists.
+func (b *Bucket) Has(key []byte) bool {
+	p := path.Join(b.dir, stringifyKey(key))
+	_, err := os.Stat(p)
+
+	return err == nil
+}
+
+func listing(root string, fn func(path string, info os.FileInfo) error) error {
+	return filepath.Walk(root, func(p string, info os.FileInfo, err error) error {
+		if err != nil || info.IsDir() {
+			return err
+		}
+
+		if fn == nil {
+			return nil
+		}
+
+		return fn(p, info)
+	})
+}
+
+// Size of bucket.
+func (b *Bucket) Size() (size int64) {
+	err := listing(b.dir, func(_ string, info os.FileInfo) error {
+		size += info.Size()
+		return nil
+	})
+
+	if err != nil {
+		size = 0
+	}
+
+	return
+}
+
+// List all bucket items.
+func (b *Bucket) List() ([][]byte, error) {
+	buckets := make([][]byte, 0)
+
+	err := listing(b.dir, func(p string, info os.FileInfo) error {
+		buckets = append(buckets, decodeKey(info.Name()))
+		return nil
+	})
+
+	return buckets, err
+}
+
+// Filter bucket items by closure.
+func (b *Bucket) Iterate(handler bucket.FilterHandler) error {
+	return listing(b.dir, func(p string, info os.FileInfo) error {
+		key := decodeKey(info.Name())
+		val, err := ioutil.ReadFile(p)
+		if err != nil {
+			return err
+		}
+
+		if !handler(key, val) {
+			return bucket.ErrIteratingAborted
+		}
+
+		return nil
+	})
+}
+
+// Close bucket (just empty).
+func (b *Bucket) Close() error {
+	return os.RemoveAll(b.dir)
+}