mirror of https://github.com/poanetwork/quorum.git
85 lines
2.7 KiB
Go
85 lines
2.7 KiB
Go
// 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/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()),
|
|
}
|
|
}
|