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# rutina
Package Rutina (russian "рутина" - ordinary boring everyday work) works like https://godoc.org/golang.org/x/sync/errgroup with small differences:
1) propagates context to routines
2) cancels context when any routine ends with any result (not only when error result)
## When it need?
Usually, when yout program consists of several routines (i.e.: http server, metrics server and os signals subscriber) and you want to stop all routines when one of them ends (i.e.: by TERM os signal in signal subscriber).
## Example
HTTP server with graceful shutdown (`example/http_server.go`):
```
// New instance with builtin context. Alternative: r, ctx := rutina.WithContext(ctx)
r, _ := rutina.New()
srv := &http.Server{Addr: ":8080"}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
io.WriteString(w, "hello world\n")
})
// Starting http server and listen connections
r.Go(func(ctx context.Context) error {
if err := srv.ListenAndServe(); err != nil {
return err
}
log.Println("Server stopped")
return nil
})
// Gracefully stoping server when context canceled
r.Go(func(ctx context.Context) error {
<-ctx.Done()
log.Println("Stopping server...")
return srv.Shutdown(ctx)
})
// OS signals listener
r.ListenTermSignals()
if err := r.Wait(); err != nil {
log.Fatal(err)
}
log.Println("All routines successfully stopped")
```
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