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// 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 feed
import (
"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
}
// timestampProvider interface describes a source of timestamp information
type timestampProvider interface {
Now() Timestamp // returns the current timestamp information
}
// 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()),
}
}
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