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// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core 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 dexon-consensus-core 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 dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.
package core
import (
"errors"
"fmt"
"os"
"sort"
"time"
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
)
var (
debug = false
// ErrEmptyTimestamps would be reported if Block.timestamps is empty.
ErrEmptyTimestamps = errors.New("timestamp vector should not be empty")
)
func init() {
if os.Getenv("DEBUG") != "" {
debug = true
}
}
// Debugf is like fmt.Printf, but only output when we are in debug mode.
func Debugf(format string, args ...interface{}) {
if debug {
fmt.Printf(format, args...)
}
}
// Debugln is like fmt.Println, but only output when we are in debug mode.
func Debugln(args ...interface{}) {
if debug {
fmt.Println(args)
}
}
func interpoTime(t1 time.Time, t2 time.Time, sep int) []time.Time {
if sep == 0 {
return []time.Time{}
}
if t1.After(t2) {
return interpoTime(t2, t1, sep)
}
timestamps := make([]time.Time, sep)
duration := t2.Sub(t1)
period := time.Duration(
(duration.Nanoseconds() / int64(sep+1))) * time.Nanosecond
prevTime := t1
for idx := range timestamps {
prevTime = prevTime.Add(period)
timestamps[idx] = prevTime
}
return timestamps
}
func getMedianTime(block *types.Block) (t time.Time, err error) {
timestamps := []time.Time{}
for _, timestamp := range block.Timestamps {
timestamps = append(timestamps, timestamp)
}
if len(timestamps) == 0 {
err = ErrEmptyTimestamps
return
}
sort.Sort(common.ByTime(timestamps))
if len(timestamps)%2 == 0 {
t1 := timestamps[len(timestamps)/2-1]
t2 := timestamps[len(timestamps)/2]
t = interpoTime(t1, t2, 1)[0]
} else {
t = timestamps[len(timestamps)/2]
}
return
}
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