store: improve interface

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

store/context.go

@@ -32,3 +32,53 @@ func SetOption(k, v interface{}) Option {
 		o.Context = context.WithValue(o.Context, k, v)
 	}
 }
+
+// SetReadOption returns a function to setup a context with given value
+func SetReadOption(k, v interface{}) ReadOption {
+	return func(o *ReadOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetWriteOption returns a function to setup a context with given value
+func SetWriteOption(k, v interface{}) WriteOption {
+	return func(o *WriteOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetListOption returns a function to setup a context with given value
+func SetListOption(k, v interface{}) ListOption {
+	return func(o *ListOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetDeleteOption returns a function to setup a context with given value
+func SetDeleteOption(k, v interface{}) DeleteOption {
+	return func(o *DeleteOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// SetExistsOption returns a function to setup a context with given value
+func SetExistsOption(k, v interface{}) ExistsOption {
+	return func(o *ExistsOptions) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}