sigmon

go get -u github.com/codemodus/sigmon

Package sigmon simplifies os.Signal handling.

The benefits of this over a more simplistic approach are eased signal bypassability, eased signal handling replaceability, the rectification of system signal quirks, and operating system portability (Windows will ignore USR1 and USR2 signals, and some testing is bypassed).

Usage

type HandlerFunc
type Signal
type SignalMonitor
    func New(fn HandlerFunc) *SignalMonitor
    func (m *SignalMonitor) Set(fn HandlerFunc)
    func (m *SignalMonitor) Start()
    func (m *SignalMonitor) Stop()
type State
    func (s *State) Signal() Signal

Setup

import (
    "github.com/codemodus/sigmon/v2"
)

func main() {
    sm := sigmon.New(nil)
    sm.Start()

    // Do things which cannot be affected by OS signals other than SIGKILL...

    sm.Set(handle)

    // Do things which can be affected by handled OS signals...

    sm.Stop()
    // OS signals will be handled normally.
}

HandlerFunc

func handle(s *sigmon.State) {
    switch s.Signal() {
    case sigmon.SIGHUP:
        // reload
    case sigmon.SIGINT, sigmon.SIGTERM:
        // stop
    case sigmon.SIGUSR1, sigmon.SIGUSR2:
        // more
    }
}

Setup Elaborated

func main() {
    sm := sigmon.New(nil)
    sm.Start()

    db := newDataBase(creds)
    db.Migrate()

    app := newWebApp(db)
    app.ListenAndServe()

    sm.Set(func(s *sigmon.State) {
        switch s.Signal() {
        case sigmon.SIGHUP:
            app.Restart()
        default:
            app.Shutdown()
        }
    })

    app.Wait()
}

HandlerFunc Using syscall Signal Constants

func handle(s *sigmon.State) {
    switch syscall.Signal(s.Signal()) {
    case syscall.SIGHUP:
        // reload
    default:
        // stop
    }
}

More Info

Windows Compatibility

sigmon will run on Windows systems without error. In order for this to be, notifications of USR1 and USR2 signals are not wired up as they are not supported whatsoever in Windows. All tests work on *nix systems, but are not run on Windows. It is up to the user to assess whether their application is receiving INT, TERM, and, HUP signals properly along with what that may mean for the design of the affected system.

Documentation

View the GoDoc

Benchmarks

N/A