github.com/mysteriumnetwork/node@v0.0.0-20240516044423-365054f76801/utils/stopper.go (about)

     1  /*
     2   * Copyright (C) 2017 The "MysteriumNetwork/node" Authors.
     3   *
     4   * This program is free software: you can redistribute it and/or modify
     5   * it under the terms of the GNU General Public License as published by
     6   * the Free Software Foundation, either version 3 of the License, or
     7   * (at your option) any later version.
     8   *
     9   * This program is distributed in the hope that it will be useful,
    10   * but WITHOUT ANY WARRANTY; without even the implied warranty of
    11   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    12   * GNU General Public License for more details.
    13   *
    14   * You should have received a copy of the GNU General Public License
    15   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
    16   */
    17  
    18  package utils
    19  
    20  import (
    21  	"os"
    22  
    23  	"github.com/rs/zerolog/log"
    24  )
    25  
    26  // Killer kills some resource and performs cleanup
    27  type Killer func() error
    28  
    29  // SoftKiller invokes killer and gives a chance for process to cleanup itself
    30  func SoftKiller(kill Killer) func() {
    31  	return newStopper(kill, doNothingAfterKill)
    32  }
    33  
    34  // HardKiller invokes provided kill method and forces process to exit
    35  func HardKiller(kill Killer) func() {
    36  	return newStopper(kill, os.Exit)
    37  }
    38  
    39  type exitter func(code int)
    40  
    41  func doNothingAfterKill(_ int) {
    42  
    43  }
    44  
    45  func newStopper(kill Killer, exit exitter) func() {
    46  	return func() {
    47  		stop(kill, exit)
    48  	}
    49  }
    50  
    51  func stop(kill Killer, exit exitter) {
    52  	if err := kill(); err != nil {
    53  		log.Error().Err(err).Stack().Msg("Error while killing process")
    54  		exit(1)
    55  		return
    56  	}
    57  
    58  	log.Info().Msg("Good bye")
    59  	exit(0)
    60  }