-
Notifications
You must be signed in to change notification settings - Fork 1
/
runner.go
180 lines (150 loc) · 3.84 KB
/
runner.go
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
package goload
import (
"context"
"github.com/HenriBeck/goload/pacer"
"github.com/mroth/weightedrand/v2"
"github.com/rs/zerolog/log"
"sync"
"time"
)
type Runner struct {
stopch chan struct{}
stopOnce sync.Once
workers int
maxWorkers int
weightOverrides map[string]int
ctxModifier func(ctx context.Context) context.Context
defaultTimeout time.Duration
startedAt *time.Time
}
func NewRunner(loadTestOptions LoadTestOptions) *Runner {
a := &Runner{
stopch: make(chan struct{}),
stopOnce: sync.Once{},
workers: loadTestOptions.initialWorkers,
maxWorkers: loadTestOptions.maxWorkers,
weightOverrides: loadTestOptions.weightOverrides,
ctxModifier: loadTestOptions.ctxModifier,
defaultTimeout: loadTestOptions.defaultTimeout,
startedAt: nil,
}
return a
}
func (r *Runner) Run(ctx context.Context, exs []Executor, p pacer.Pacer, du time.Duration) <-chan *Result {
var wg sync.WaitGroup
workers := r.workers
if workers > r.maxWorkers {
workers = r.maxWorkers
}
chooser := r.getExecutorChooser(exs)
now := time.Now()
r.startedAt = &now
results := make(chan *Result)
ticks := make(chan struct{})
for i := 0; i < workers; i++ {
wg.Add(1)
go r.run(chooser, now, &wg, ticks, results)
}
go func() {
<-ctx.Done()
r.Stop()
}()
go func() {
defer func() {
close(ticks)
wg.Wait()
close(results)
r.Stop()
}()
count := uint64(0)
for {
elapsed := time.Since(now)
if du > 0 && elapsed > du {
return
}
wait := p.Pace(elapsed, count)
time.Sleep(wait)
if workers < r.maxWorkers {
select {
case ticks <- struct{}{}:
count++
continue
case <-r.stopch:
return
default:
// all workers are blocked. start one more and try again
workers++
wg.Add(1)
go r.run(chooser, now, &wg, ticks, results)
}
}
select {
case ticks <- struct{}{}:
count++
case <-r.stopch:
return
}
}
}()
return results
}
func (r *Runner) getExecutorChooser(exs []Executor) *weightedrand.Chooser[Executor, int] {
choices := make([]weightedrand.Choice[Executor, int], 0, len(exs))
for _, ex := range exs {
weight := ex.Options().Weight
if override, ok := r.weightOverrides[ex.Name()]; ok {
weight = override
}
choices = append(choices, weightedrand.NewChoice(ex, weight))
}
chooser, err := weightedrand.NewChooser(choices...)
if err != nil {
log.Fatal().Err(err).Msg("can't create chooser")
}
return chooser
}
// Stop stops the current execution. The return value indicates whether this call
// has signalled the execution to stop (`true` for the first call) or whether it
// was a noop because it has been previously signalled to stop (`false` for any
// subsequent calls).
func (r *Runner) Stop() bool {
select {
case <-r.stopch:
return false
default:
r.stopOnce.Do(func() { close(r.stopch) })
return true
}
}
func (r *Runner) run(chooser *weightedrand.Chooser[Executor, int], began time.Time, workers *sync.WaitGroup, ticks <-chan struct{}, results chan<- *Result) {
defer workers.Done()
for range ticks {
results <- r.hit(chooser.Pick(), began)
}
}
func (r *Runner) hit(ex Executor, began time.Time) *Result {
res := Result{
Timestamp: began.Add(time.Since(began)),
}
defer func() {
res.Latency = time.Since(res.Timestamp)
}()
ctx := context.Background()
if ex.Options().Timeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(context.Background(), ex.Options().Timeout)
defer cancel()
} else if r.defaultTimeout > 0 {
var cancel context.CancelFunc
ctx, cancel = context.WithTimeout(context.Background(), ex.Options().Timeout)
defer cancel()
}
if r.ctxModifier != nil {
ctx = r.ctxModifier(ctx)
}
resp := ex.Execute(ctx)
res.Identifier = resp.Identifier
res.AdditionalData = resp.AdditionalData
res.Err = resp.Err
return &res
}