Introduction

hitman is a small library useful for cleaning up go routines. The api consists mainly of Targets and workers. Workers are required to implement a minimal interface for use with Targets.Add(). When the code needs to shutdown gracefully it can then call Targets.Close() which will send shutdown signals to the workers.

Changes

2016-03-01

1. Added AddOrPanic for services that return errors on construction (convenience).
2. Partitioned the Target interface into Named and Target so that Name() was optional.
3. Added Put that can take a given name instead of requiring the Named interface.
4. Added tests for the above changes.

Example

// Workers implement the Target interface and Start() KillChannel

type Worker struct {}

func (w *Worker) Start() KillChannel {
	kill := NewKillChannel()
	go func(done KillChannel) {
		select {
		case cleaner := <-done:
			cleaner.WaitGroup.Done()
			return
		}
	}(kill)
	return kill
}

// Worker lifecycles are then managed with a Targets collection:
func main() {
	hits := NewTargets()
	hits.Add(&Worker{})
	hits.Add(&Worker{})
	hits.Close()
}

Using Death

If you use the Death library then it can be written like the example below.

import (
    DEATH "github.com/vrecan/death"
    SYS "syscall"
)

type Service struct {}
func NewService() (*Server, error) {
  s := &Service{}
  // Do something that might produce error
  _, err := ioutil.ReadFile("doh.txt")
  return s, err
}

func main() {
	hits := NewTargets()
	hits.AddOrPanic(NewWorker())
	hits.AddOrPanic(NewWorker())

	//pass the signals you want to end your application
	death := DEATH.NewDeath(SYS.SIGINT, SYS.SIGTERM)

	// when you want to block for shutdown signals
	// this will finish when a signal of your type is sent to your application
	death.WaitForDeath(hits) 

}

License

See license file.

The use and distribution terms for this software are covered by the Eclipse Public License 1.0, which can be found in the file 'license' at the root of this distribution. By using this software in any fashion, you are agreeing to be bound by the terms of this license. You must not remove this notice, or any other, from this software.