-
Notifications
You must be signed in to change notification settings - Fork 3
/
generate-samples.go
83 lines (69 loc) · 2.03 KB
/
generate-samples.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
package steps
import (
"fmt"
"math"
"sync"
"time"
"github.com/antongulenko/golib"
"github.com/bitflow-stream/go-bitflow/bitflow"
"github.com/bitflow-stream/go-bitflow/script/reg"
log "github.com/sirupsen/logrus"
)
var _ bitflow.SampleSource = new(GeneratorSource)
const GeneratorSourceEndpointType = "generate"
var GeneratorSourceParameters = reg.RegisteredParameters{}.
Optional("interval", reg.Duration(), 500*time.Millisecond)
type GeneratorSource struct {
bitflow.AbstractSampleSource
loop golib.LoopTask
sleepTime time.Duration
}
func RegisterGeneratorSource(factory *bitflow.EndpointFactory) {
factory.CustomDataSources[GeneratorSourceEndpointType] = func(urlStr string) (bitflow.SampleSource, error) {
_, params, err := reg.ParseEndpointUrlParams(urlStr, GeneratorSourceParameters)
if err != nil {
return nil, fmt.Errorf("Failed to parse URL '%v': %v", urlStr, err)
}
return &GeneratorSource{
sleepTime: params["interval"].(time.Duration),
}, nil
}
}
func (s *GeneratorSource) String() string {
return fmt.Sprintf("Sample generator (generated every %v)", s.sleepTime)
}
func (s *GeneratorSource) Start(wg *sync.WaitGroup) (_ golib.StopChan) {
s.loop.Description = fmt.Sprintf("Loop of %v", s)
s.loop.Loop = s.sendSample
return s.loop.Start(wg)
}
func (s *GeneratorSource) Close() {
s.loop.Stop()
s.CloseSink()
}
func (s *GeneratorSource) sendSample(stop golib.StopChan) error {
sample, header := s.generateSample()
if err := s.GetSink().Sample(sample, header); err != nil {
log.Errorf("%v: Error sinking sample: %v", s, err)
}
stop.WaitTimeout(s.sleepTime)
return nil
}
func (s *GeneratorSource) generateSample() (*bitflow.Sample, *bitflow.Header) {
sample := &bitflow.Sample{
Time: time.Now(),
Values: []bitflow.Value{
bitflow.Value(math.NaN()),
bitflow.Value(math.Inf(1)),
bitflow.Value(math.Inf(-1)),
-math.MaxFloat64,
math.MaxFloat64,
},
}
header := &bitflow.Header{
Fields: []string{
"nan", "plusInfinite", "minusInfinite", "min", "max",
},
}
return sample, header
}