1 files changed, 84 insertions, 0 deletions
diff --git a/swarm/storage/feeds/timestampprovider.go b/swarm/storage/feeds/timestampprovider.go
new file mode 100644
index 000000000..f6aa0775c
--- /dev/null
+++ b/swarm/storage/feeds/timestampprovider.go
@@ -0,0 +1,84 @@
+// Copyright 2018 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library 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 Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package feeds
+
+import (
+	"encoding/binary"
+	"encoding/json"
+	"time"
+)
+
+// TimestampProvider sets the time source of the feeds package
+var TimestampProvider timestampProvider = NewDefaultTimestampProvider()
+
+// Timestamp encodes a point in time as a Unix epoch
+type Timestamp struct {
+	Time uint64 `json:"time"` // Unix epoch timestamp, in seconds
+}
+
+// 8 bytes uint64 Time
+const timestampLength = 8
+
+// timestampProvider interface describes a source of timestamp information
+type timestampProvider interface {
+	Now() Timestamp // returns the current timestamp information
+}
+
+// binaryGet populates the timestamp structure from the given byte slice
+func (t *Timestamp) binaryGet(data []byte) error {
+	if len(data) != timestampLength {
+		return NewError(ErrCorruptData, "timestamp data has the wrong size")
+	}
+	t.Time = binary.LittleEndian.Uint64(data[:8])
+	return nil
+}
+
+// binaryPut Serializes a Timestamp to a byte slice
+func (t *Timestamp) binaryPut(data []byte) error {
+	if len(data) != timestampLength {
+		return NewError(ErrCorruptData, "timestamp data has the wrong size")
+	}
+	binary.LittleEndian.PutUint64(data, t.Time)
+	return nil
+}
+
+// UnmarshalJSON implements the json.Unmarshaller interface
+func (t *Timestamp) UnmarshalJSON(data []byte) error {
+	return json.Unmarshal(data, &t.Time)
+}
+
+// MarshalJSON implements the json.Marshaller interface
+func (t *Timestamp) MarshalJSON() ([]byte, error) {
+	return json.Marshal(t.Time)
+}
+
+// DefaultTimestampProvider is a TimestampProvider that uses system time
+// as time source
+type DefaultTimestampProvider struct {
+}
+
+// NewDefaultTimestampProvider creates a system clock based timestamp provider
+func NewDefaultTimestampProvider() *DefaultTimestampProvider {
+	return &DefaultTimestampProvider{}
+}
+
+// Now returns the current time according to this provider
+func (dtp *DefaultTimestampProvider) Now() Timestamp {
+	return Timestamp{
+		Time: uint64(time.Now().Unix()),
+	}
+}