1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// 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"
)
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(timestamps []time.Time) (t time.Time, err error) {
if len(timestamps) == 0 {
err = ErrEmptyTimestamps
return
}
tscopy := make([]time.Time, 0, len(timestamps))
for _, ts := range timestamps {
tscopy = append(tscopy, ts)
}
sort.Sort(common.ByTime(tscopy))
if len(tscopy)%2 == 0 {
t1 := tscopy[len(tscopy)/2-1]
t2 := tscopy[len(tscopy)/2]
t = interpoTime(t1, t2, 1)[0]
} else {
t = tscopy[len(tscopy)/2]
}
return
}
func removeFromSortedUint32Slice(xs []uint32, x uint32) []uint32 {
indexToRemove := sort.Search(len(xs), func(idx int) bool {
return xs[idx] >= x
})
if indexToRemove == len(xs) || xs[indexToRemove] != x {
// This value is not found.
return xs
}
return append(xs[:indexToRemove], xs[indexToRemove+1:]...)
}
|
