frostfs-http-gw/metrics/service.go

package metrics

import (
	"context"
	"net/http"

	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
	"go.uber.org/zap"
)

// Service serves metrics.
type Service struct {
	*http.Server
	enabled     bool
	log         *zap.Logger
	serviceType string
}

// Config is a params to configure service.
type Config struct {
	Address string
	Enabled bool
}

// Start runs http service with the exposed endpoint on the configured port.
func (ms *Service) Start() {
	if ms.enabled {
		ms.log.Info(logs.ServiceIsRunning, zap.String("endpoint", ms.Addr), logs.TagField(logs.TagApp))
		err := ms.ListenAndServe()
		if err != nil && err != http.ErrServerClosed {
			ms.log.Warn(logs.ServiceCouldntStartOnConfiguredPort, logs.TagField(logs.TagApp))
		}
	} else {
		ms.log.Info(logs.ServiceHasntStartedSinceItsDisabled, logs.TagField(logs.TagApp))
	}
}

// ShutDown stops the service.
func (ms *Service) ShutDown(ctx context.Context) {
	ms.log.Info(logs.ShuttingDownService, zap.String("endpoint", ms.Addr), logs.TagField(logs.TagApp))
	err := ms.Shutdown(ctx)
	if err != nil {
		ms.log.Error(logs.CantGracefullyShutDownService, zap.Error(err), logs.TagField(logs.TagApp))
		if err = ms.Close(); err != nil {
			ms.log.Panic(logs.CantShutDownService, zap.Error(err), logs.TagField(logs.TagApp))
		}
	}
}