using own Db wrapper class around bolt db

upd/api/timestamp.go

@@ -0,0 +1,63 @@
+/*
+Copyright © 2023 Thomas von Dein
+
+This program 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.
+
+This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package api
+
+import (
+	"strconv"
+	"time"
+)
+
+// https://gist.github.com/rhcarvalho/9338c3ff8850897c68bc74797c5dc25b
+
+// Timestamp is like  time.Time, but knows how to  unmarshal from JSON
+// Unix timestamp  numbers or RFC3339  strings, and marshal  back into
+// the same JSON representation.
+type Timestamp struct {
+	time.Time
+	rfc3339 bool
+}
+
+func (t Timestamp) MarshalJSON() ([]byte, error) {
+	if t.rfc3339 {
+		return t.Time.MarshalJSON()
+	}
+	return t.formatUnix()
+}
+
+func (t *Timestamp) UnmarshalJSON(data []byte) error {
+	err := t.Time.UnmarshalJSON(data)
+	if err != nil {
+		return t.parseUnix(data)
+	}
+	t.rfc3339 = true
+	return nil
+}
+
+func (t Timestamp) formatUnix() ([]byte, error) {
+	sec := float64(t.Time.UnixNano()) * float64(time.Nanosecond) / float64(time.Second)
+	return strconv.AppendFloat(nil, sec, 'f', -1, 64), nil
+}
+
+func (t *Timestamp) parseUnix(data []byte) error {
+	f, err := strconv.ParseFloat(string(data), 64)
+	if err != nil {
+		return err
+	}
+	t.Time = time.Unix(0, int64(f*float64(time.Second/time.Nanosecond)))
+	return nil
+}