1 files changed, 62 insertions, 0 deletions
diff --git a/signer/storage/storage.go b/signer/storage/storage.go
new file mode 100644
index 000000000..60f4e3892
--- /dev/null
+++ b/signer/storage/storage.go
@@ -0,0 +1,62 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of go-ethereum.
+//
+// go-ethereum is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// go-ethereum is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
+//
+
+package storage
+
+import (
+	"fmt"
+)
+
+type Storage interface {
+	// Put stores a value by key. 0-length keys results in no-op
+	Put(key, value string)
+	// Get returns the previously stored value, or the empty string if it does not exist or key is of 0-length
+	Get(key string) string
+}
+
+// EphemeralStorage is an in-memory storage that does
+// not persist values to disk. Mainly used for testing
+type EphemeralStorage struct {
+	data      map[string]string
+	namespace string
+}
+
+func (s *EphemeralStorage) Put(key, value string) {
+	if len(key) == 0 {
+		return
+	}
+	fmt.Printf("storage: put %v -> %v\n", key, value)
+	s.data[key] = value
+}
+
+func (s *EphemeralStorage) Get(key string) string {
+	if len(key) == 0 {
+		return ""
+	}
+	fmt.Printf("storage: get %v\n", key)
+	if v, exist := s.data[key]; exist {
+		return v
+	}
+	return ""
+}
+
+func NewEphemeralStorage() Storage {
+	s := &EphemeralStorage{
+		data: make(map[string]string),
+	}
+	return s
+}