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
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
|
/*
* This file is part of Go Responsiveness.
*
* Go Responsiveness 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 2 of the License, or (at your option) any later version.
* Go Responsiveness 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 Go Responsiveness. If not, see <https://www.gnu.org/licenses/>.
*/
package utilities
import (
"context"
"fmt"
"math"
"math/rand"
"os"
"reflect"
"strings"
"sync"
"sync/atomic"
"time"
)
// GitVersion is the Git revision hash
var GitVersion = "dev"
func Iota(low int, high int) (made []int) {
made = make([]int, high-low)
for counter := low; counter < high; counter++ {
made[counter-low] = counter
}
return
}
func IsInterfaceNil(ifc interface{}) bool {
return ifc == nil ||
(reflect.ValueOf(ifc).Kind() == reflect.Ptr && reflect.ValueOf(ifc).IsNil())
}
func Conditional[T any](condition bool, t T, f T) T {
if condition {
return t
}
return f
}
func ToMbps(bytes float64) float64 {
return ToMBps(bytes) * float64(8)
}
func ToMBps(bytes float64) float64 {
return float64(bytes) / float64(1024*1024)
}
type MeasurementResult struct {
Delay time.Duration
MeasurementCount uint16
Err error
}
func SeekForAppend(file *os.File) (err error) {
_, err = file.Seek(0, 2)
return
}
var GenerateUniqueId func() uint64 = func() func() uint64 {
var nextConnectionId uint64 = 0
return func() uint64 {
return atomic.AddUint64(&nextConnectionId, 1)
}
}()
type Optional[S any] struct {
value S
some bool
}
func Some[S any](value S) Optional[S] {
return Optional[S]{value: value, some: true}
}
func None[S any]() Optional[S] {
return Optional[S]{some: false}
}
func IsNone[S any](optional Optional[S]) bool {
return !optional.some
}
func IsSome[S any](optional Optional[S]) bool {
return optional.some
}
func GetSome[S any](optional Optional[S]) S {
if !optional.some {
panic("Attempting to access Some of a None.")
}
return optional.value
}
func (optional Optional[S]) String() string {
if IsSome(optional) {
return fmt.Sprintf("Some: %v", optional.some)
} else {
return "None"
}
}
func RandBetween(max int) int {
return rand.New(rand.NewSource(int64(time.Now().Nanosecond()))).Int() % max
}
func ChannelToSlice[S any](channel <-chan S) (slice []S) {
slice = make([]S, 0)
for element := range channel {
slice = append(slice, element)
}
return
}
func Reverse[T any](elements []T) []T {
result := make([]T, len(elements))
iterator := len(elements) - 1
for _, v := range elements {
result[iterator] = v
iterator--
}
return result
}
func Filter[S any](elements []S, filterer func(S) bool) []S {
result := make([]S, 0)
for _, s := range elements {
if filterer(s) {
result = append(result, s)
}
}
return result
}
func Fmap[S any, F any](elements []S, mapper func(S) F) []F {
result := make([]F, 0)
for _, s := range elements {
result = append(result, mapper(s))
}
return result
}
func OrTimeout(f func(), timeout time.Duration) {
completeChannel := func() chan interface{} {
completed := make(chan interface{})
go func() {
// This idea taken from https://stackoverflow.com/a/32843750.
// Closing the channel will let the read of it proceed immediately.
// Making that operation a defer ensures that it will happen even if
// the function f panics during its execution.
defer close(completed)
f()
}()
return completed
}()
select {
case <-completeChannel:
break
case <-time.After(timeout):
break
}
}
func FilenameAppend(filename, appendage string) string {
pieces := strings.SplitN(filename, ".", 2)
result := pieces[0] + appendage
if len(pieces) > 1 {
result = result + "." + strings.Join(pieces[1:], ".")
}
return result
}
func ApproximatelyEqual[T float32 | float64](truth T, maybe T, fudge T) bool {
bTruth := float64(truth)
bMaybe := float64(maybe)
bFudge := float64(fudge)
diff := math.Abs((bTruth - bMaybe))
return diff < bFudge
}
func UserAgent() string {
return fmt.Sprintf("goresponsiveness/%s", GitVersion)
}
func WaitWithContext(ctxt context.Context, condition *func() bool, mu *sync.Mutex, c *sync.Cond) bool {
mu.Lock()
for !(*condition)() && ctxt.Err() == nil {
c.Wait()
}
return ctxt.Err() == nil
}
func ContextSignaler(ctxt context.Context, st time.Duration, condition *func() bool, c *sync.Cond) {
for !(*condition)() && ctxt.Err() == nil {
time.Sleep(st)
}
if ctxt.Err() != nil {
c.Broadcast()
return
}
}
type Pair[T1, T2 any] struct {
First T1
Second T2
}
func PerSecondToInterval(rate int64) time.Duration {
return time.Duration(time.Second.Nanoseconds() / rate)
}
func IndentOutput(output string, depth uint, character string) string {
finalNewline := false
if strings.LastIndex(output, "\n") == len(output)-1 {
finalNewline = true
output = strings.TrimSuffix(output, "\n")
}
indentedOutput := strings.Join(Fmap[string](strings.SplitAfter(output, "\n"), func(line string) string {
return strings.Repeat(character, int(depth)) + line
}), "")
if finalNewline {
indentedOutput += "\n"
}
return indentedOutput
}
|
