Initial import

storage/kv.go

@@ -0,0 +1,61 @@
+package storage
+
+import (
+	"encoding/json"
+
+	"git.maze.io/maze/conduit/storage/codec"
+)
+
+// KV implements a key-value store.
+type KV interface {
+	// Has checks if the key is present.
+	Has(key string) bool
+
+	// Get a value by key.
+	Get(key string) (value []byte, ok bool)
+}
+
+// WritableKV can store key-value items.
+type WritableKV interface {
+	KV
+
+	// Close the key-value storage.
+	Close() error
+
+	// DeleteKey removes a key.
+	Delete(key string) error
+
+	// Set a value by key.
+	Set(key string, value []byte) error
+}
+
+type EncodedKV interface {
+	Has(key string) bool
+	Get(key string, value any) (ok bool, err error)
+}
+
+type EncodedWritableKV interface {
+	EncodedKV
+
+	Close() error
+
+	Delete(key string) error
+
+	Set(key string, value []byte) error
+}
+
+type encodedKV struct {
+	kv     KV
+	encode func(any) ([]byte, error)
+	decode func([]byte, any) error
+}
+
+func (kv encodedKV) Has(key)
+
+func NewEncodedKV(kv KV, codec codec.Codec) EncodedKV {
+	return &encodedKV{
+		kv:     kv,
+		encode: json.Marshal,
+		decode: json.Unmarshal,
+	}
+}