forked from Technofy/cloudwatch_exporter
-
Notifications
You must be signed in to change notification settings - Fork 0
/
collector.go
125 lines (103 loc) · 3.18 KB
/
collector.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 main
import (
"errors"
"github.com/prometheus/client_golang/prometheus"
"github.com/technofy/cloudwatch_exporter/config"
"time"
)
var (
templates = map[string]*cwCollectorTemplate{}
)
type cwMetric struct {
Desc *prometheus.Desc
ValType prometheus.ValueType
ConfMetric *config.Metric
LabelNames []string
LabelValues []string
}
type cwCollectorTemplate struct {
Metrics []cwMetric
Task *config.Task
}
type cwCollector struct {
Region string
Target string
ScrapeTime prometheus.Gauge
ErroneousRequests prometheus.Counter
Template *cwCollectorTemplate
}
// generateTemplates creates pre-generated metrics descriptions so that only the metrics are created from them during a scrape.
func generateTemplates(cfg *config.Settings) {
for t := range cfg.Tasks {
var template = new(cwCollectorTemplate)
//Save the task it belongs to
template.Task = &cfg.Tasks[t]
//Pre-allocate at least a few metrics
template.Metrics = make([]cwMetric, 0, len(cfg.Tasks[t].Metrics))
for m := range cfg.Tasks[t].Metrics {
metric := &cfg.Tasks[t].Metrics[m]
labels := make([]string, len(metric.Dimensions))
for i := range metric.Dimensions {
labels[i] = toSnakeCase(metric.Dimensions[i])
}
labels = append(labels, "task")
for s := range metric.Statistics {
template.Metrics = append(template.Metrics, cwMetric{
Desc: prometheus.NewDesc(
safeName(toSnakeCase(metric.Namespace)+"_"+toSnakeCase(metric.Name)+"_"+toSnakeCase(metric.Statistics[s])),
metric.Name,
labels,
nil),
ValType: prometheus.GaugeValue,
ConfMetric: metric,
LabelNames: labels,
})
}
}
templates[cfg.Tasks[t].Name] = template
}
}
// NewCwCollector creates a new instance of a CwCollector for a specific task
// The newly created instance will reference its parent template so that metric descriptions are not recreated on every call.
// It returns either a pointer to a new instance of cwCollector or an error.
func NewCwCollector(target string, taskName string, region string) (*cwCollector, error) {
// Check if task exists
task, err := settings.GetTask(taskName)
if err != nil {
return nil, err
}
if region == "" {
if task.DefaultRegion == "" {
return nil, errors.New("No region or default region set requested task")
} else {
region = task.DefaultRegion
}
}
return &cwCollector{
Region: region,
Target: target,
ScrapeTime: prometheus.NewGauge(prometheus.GaugeOpts{
Name: "cloudwatch_exporter_scrape_duration_seconds",
Help: "Time this CloudWatch scrape took, in seconds.",
}),
ErroneousRequests: prometheus.NewGauge(prometheus.GaugeOpts{
Name: "cloudwatch_exporter_erroneous_requests",
Help: "The number of erroneous request made by this scrape.",
}),
Template: templates[taskName],
}, nil
}
func (c *cwCollector) Collect(ch chan<- prometheus.Metric) {
now := time.Now()
scrape(c, ch)
c.ScrapeTime.Set(time.Since(now).Seconds())
ch <- c.ScrapeTime
ch <- c.ErroneousRequests
}
func (c *cwCollector) Describe(ch chan<- *prometheus.Desc) {
ch <- c.ScrapeTime.Desc()
ch <- c.ErroneousRequests.Desc()
for m := range c.Template.Metrics {
ch <- c.Template.Metrics[m].Desc
}
}