-
Notifications
You must be signed in to change notification settings - Fork 0
/
metrics_endpoint.go
79 lines (66 loc) · 1.91 KB
/
metrics_endpoint.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
package metricsendpoint
import (
"context"
"net/http"
cwexporter "github.com/bluedigital/prometheus-cloudwatch-exporter/pkg/cw-exporter"
"github.com/gorilla/mux"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/spf13/viper"
"github.com/rs/zerolog/log"
)
type MetricsEndpoint struct {
server *http.Server
exporter *cwexporter.Exporter
promHandler http.Handler
}
func NewMetricsEndpoint(e *cwexporter.Exporter) *MetricsEndpoint {
return &MetricsEndpoint{
exporter: e,
promHandler: promhttp.Handler(),
}
}
func (m *MetricsEndpoint) Start() {
r := mux.NewRouter()
r.HandleFunc("/metrics", m.MetricsHandler)
r.HandleFunc("/reload", m.ReloadHandler)
m.server = &http.Server{
Addr: viper.GetString("metrics_address"),
Handler: r,
ReadTimeout: viper.GetDuration("metrics_read_timeout"),
ReadHeaderTimeout: viper.GetDuration("metrics_read_header_timeout"),
IdleTimeout: viper.GetDuration("metrics_idle_timeout"),
}
go func() {
err := m.server.ListenAndServe()
if err != nil && err != http.ErrServerClosed {
log.Error().Err(err).Send()
}
}()
}
func (m *MetricsEndpoint) Stop() {
localCtx, localCancel := context.WithTimeout(context.Background(), viper.GetDuration("metrics_shutdown_timeout"))
defer localCancel()
err := m.server.Shutdown(localCtx)
if err == nil {
return
}
log.Error().Err(err).Send()
err = m.server.Close()
if err == nil {
return
}
log.Error().Err(err).Send()
}
func (m *MetricsEndpoint) MetricsHandler(req http.ResponseWriter, res *http.Request) {
m.exporter.UpdateCache()
m.promHandler.ServeHTTP(req, res)
log.Info().Msg("metrics endpoint scraped")
}
func (m *MetricsEndpoint) ReloadHandler(req http.ResponseWriter, res *http.Request) {
err := m.exporter.Load()
if err != nil {
log.Error().Err(err).Msg("reload error")
}
m.promHandler.ServeHTTP(req, res)
log.Info().Msg("reload enpoint called")
}