/
exporter.go
125 lines (109 loc) · 2.94 KB
/
exporter.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
package easyxporter
import (
"fmt"
"sync"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/sirupsen/logrus"
)
type EasyCollector struct {
logger *logrus.Logger
Collectors map[string]Collector
scrapeDurationDesc *prometheus.Desc
scrapeSuccessDesc *prometheus.Desc
}
func newEasyCollector(logger *logrus.Logger, namespace string, filters ...string) (*EasyCollector, error) {
f := make(map[string]bool)
for _, filter := range filters {
enabled, exist := collectorState[filter]
if !exist {
return nil, fmt.Errorf("missing collector: %s", filter)
}
if !*enabled {
return nil, fmt.Errorf("disabled collector: %s", filter)
}
f[filter] = true
}
collectors := make(map[string]Collector)
for key, enabled := range collectorState {
if !*enabled || (len(f) > 0 && !f[key]) {
continue
}
if collector, ok := initiatedCollectors[key]; ok {
collectors[key] = collector
} else {
logger.Debug("init collector: ", key)
collector, err := factories[key](logger)
if err != nil {
return nil, err
}
collectors[key] = collector
initiatedCollectors[key] = collector
}
}
return &EasyCollector{
logger: logger,
Collectors: collectors,
scrapeDurationDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "scrape", "collector_duration_seconds"),
"node_exporter: Duration of a collector scrape.",
[]string{"collector"},
nil,
),
scrapeSuccessDesc: prometheus.NewDesc(
prometheus.BuildFQName(namespace, "scrape", "collector_success"),
"node_exporter: Whether a collector succeeded.",
[]string{"collector"},
nil,
),
}, nil
}
func (s EasyCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- s.scrapeDurationDesc
ch <- s.scrapeSuccessDesc
}
func (s EasyCollector) Collect(ch chan<- prometheus.Metric) {
wg := sync.WaitGroup{}
wg.Add(len(s.Collectors))
// collect from sync collectors
for name, c := range s.Collectors {
go func(name string, c Collector) {
s.execute(name, c, ch, s.logger)
wg.Done()
}(name, c)
}
wg.Wait()
}
func (s EasyCollector) execute(name string, c Collector, ch chan<- prometheus.Metric, logger *logrus.Logger) {
begin := time.Now()
err := c.Update(ch)
duration := time.Since(begin)
var success float64
if err != nil {
if IsNoDataError(err) {
logger.Debug(
"msg: ", "collector returned no data",
" name: ", name,
" duration_seconds: ", duration.Seconds(),
" err: ", err,
)
} else {
logger.Error(
"msg: ", "collector failed",
" name: ", name,
" duration_seconds: ", duration.Seconds(),
" err: ", err,
)
}
success = 0
} else {
logger.Debug(
"msg: ", "collector succeeded",
" name: ", name,
" duration_seconds: ", duration.Seconds(),
)
success = 1
}
ch <- prometheus.MustNewConstMetric(s.scrapeDurationDesc, prometheus.GaugeValue, duration.Seconds(), name)
ch <- prometheus.MustNewConstMetric(s.scrapeSuccessDesc, prometheus.GaugeValue, success, name)
}