// Package service provides a toolkit for creating Hnakra services.
package service

import "os"
import "log"
import "time"
import "hnakra/rotate"
import "hnakra/routines"

// Service is capable of managing multiple mounts. It also sets up logging
// automatically.
type Service []Mount

// Run runs the mounts within the service, and only exits when all of them have
// exited. It will automatically start logging to the directory specified by
// $HNAKRA_LOG_DIR. If that variable is unset, it will just log to stdout.
func (service Service) Run () error {
	// set up logging
	logDir := os.Getenv("HNAKRA_LOG_DIR")
	if logDir != "" {
		logger, err := rotate.New(logDir)
		if err != nil { log.Fatal("cannot access log dir:", err) }
		log.SetOutput(logger)
	}

	// set up routine manager
	manager := routines.Manager { RestartDeadline: time.Second * 8 }
	manager.Routines = make([]routines.Routine, len(service))
	for index, mount := range manager.Routines {
		manager.Routines[index] = mount
	}

	// send it
	err := manager.Run()
	if err != nil { log.Println("XXX", err) }
	return err
}

// Close abruptly closes all mounts in the service. This will cause Run() to
// exit.
func (service Service) Close () (err error) {
	for _, mount := range service {
		singleErr := mount.Close()
		if singleErr != nil {
			err = singleErr
		}
	}
	return
}

// Shutdown gracefully shuts down each mount in the service. This will cause
// Run() to exit.
func (service Service) Shutdown () (err error) {
	for _, mount := range service {
		singleErr := mount.Shutdown()
		if singleErr != nil {
			err = singleErr
		}
	}
	return
}