66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"net/http"
|
|
"time"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
)
|
|
|
|
var (
|
|
msgsSent = prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Name: "msgs_sent",
|
|
Help: "Messages sent by bot",
|
|
})
|
|
msgsReceived = prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Name: "msgs_received",
|
|
Help: "Message responses received by bot",
|
|
})
|
|
msgsLatencies = prometheus.NewSummary(prometheus.SummaryOpts{
|
|
Name: "msgs_responses_latency",
|
|
Help: "Latencies of responses to bot messages",
|
|
Objectives: map[float64]float64{0.5: 0.05, 0.9: 0.01, 0.99: 0.001},
|
|
})
|
|
)
|
|
|
|
func init() {
|
|
// Metrics have to be registered to be exposed
|
|
prometheus.MustRegister(msgsSent)
|
|
prometheus.MustRegister(msgsReceived)
|
|
prometheus.MustRegister(msgsLatencies)
|
|
}
|
|
|
|
// Stats represents messages' statistics.
|
|
type Stats struct {
|
|
}
|
|
|
|
// For verifying the service is up
|
|
func healthHandler(w http.ResponseWriter, r *http.Request) {
|
|
fmt.Fprintf(w, "OK")
|
|
}
|
|
|
|
// NewStats returns new empty Stats object.
|
|
func NewStats(statsPort string) *Stats {
|
|
go func() {
|
|
http.Handle("/metrics", promhttp.Handler())
|
|
// Add most trivial healthcheck
|
|
http.HandleFunc("/health", healthHandler)
|
|
log.Fatal(http.ListenAndServe(statsPort, nil))
|
|
}()
|
|
return &Stats{}
|
|
}
|
|
|
|
// AddSent adds information about sent messages.
|
|
func (s *Stats) AddSent() {
|
|
msgsSent.Inc()
|
|
}
|
|
|
|
// AddRoundtrip adds information about successful message roundtrip.
|
|
func (s *Stats) AddRountrip(d time.Duration) {
|
|
msgsReceived.Inc()
|
|
msgsLatencies.Observe(float64(d / time.Millisecond))
|
|
}
|