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package metrics
import (
"context"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promhttp"
"net/http"
"sync"
)
// ID declares public service name.
const ID = "metrics"
// Service to manage application metrics using Prometheus.
type Service struct {
cfg *Config
mu sync.Mutex
http *http.Server
}
// Init service.
func (s *Service) Init(cfg *Config) (bool, error) {
s.cfg = cfg
return true, nil
}
// Enabled indicates that server is able to collect metrics.
func (s *Service) Enabled() bool {
return s.cfg != nil
}
// Register new prometheus collector.
func (s *Service) Register(c prometheus.Collector) error {
return prometheus.Register(c)
}
// MustRegister registers new collector or fails with panic.
func (s *Service) MustRegister(c prometheus.Collector) {
if err := prometheus.Register(c); err != nil {
panic(err)
}
}
// Serve prometheus metrics service.
func (s *Service) Serve() error {
// register application specific metrics
if err := s.cfg.registerMetrics(); err != nil {
return err
}
s.mu.Lock()
s.http = &http.Server{Addr: s.cfg.Address, Handler: promhttp.Handler()}
s.mu.Unlock()
return s.http.ListenAndServe()
}
// Stop prometheus metrics service.
func (s *Service) Stop() {
s.mu.Lock()
defer s.mu.Unlock()
if s.http != nil {
// gracefully stop server
go s.http.Shutdown(context.Background())
}
}
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