Added OS signals handler

Added go.mod

README.md

@@ -15,7 +15,7 @@ HTTP server with graceful shutdown (`example/http_server.go`):
 
 ```
 // New instance with builtin context. Alternative: r, ctx := rutina.WithContext(ctx)
-r := rutina.New()
+r, _ := rutina.New()
 
 srv := &http.Server{Addr: ":8080"}
 http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
@@ -38,17 +38,8 @@ r.Go(func(ctx context.Context) error {
     return srv.Shutdown(ctx)
 })
 
-// OS signals subscriber
-r.Go(func(ctx context.Context) error {
-    sig := make(chan os.Signal, 1)
-    signal.Notify(sig, syscall.SIGTERM, syscall.SIGINT)
-    select {
-    case <-sig:
-        log.Println("TERM or INT signal received")
-    case <-ctx.Done():
-    }
-    return nil
-})
+// OS signals listener
+r.ListenTermSignals()
 
 if err := r.Wait(); err != nil {
     log.Fatal(err)

example/http_server.go

@@ -1,3 +1,5 @@
+// +build ignore
+
 package main
 
 import (

go.mod

@@ -0,0 +1,6 @@
+module github.com/NeonXP/rutina
+
+require (
+	github.com/neonxp/rutina v0.0.0-20181204214833-c582001e89c0
+	github.com/pkg/errors v0.8.1
+)

go.sum

@@ -0,0 +1,4 @@
+github.com/neonxp/rutina v0.0.0-20181204214833-c582001e89c0 h1:AyPAQ9ebiG/k20WXojUg0rIqodaaw1KFYk4QJpHYIm4=
+github.com/neonxp/rutina v0.0.0-20181204214833-c582001e89c0/go.mod h1:QJOHIcMI4Lh4Nyyi0v119KZllW1S5KxJyy/zg5KQXno=
+github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=

rutina.go

@@ -2,7 +2,10 @@ package rutina
 
 import (
 	"context"
+	"os"
+	"os/signal"
 	"sync"
+	"syscall"
 )
 
 //Rutina is routine manager
@@ -44,6 +47,20 @@ func (r *Rutina) Go(doer func(ctx context.Context) error) {
 	}()
 }
 
+// OS signals handler
+func (r *Rutina) ListenTermSignals() {
+	r.Go(func(ctx context.Context) error {
+		sig := make(chan os.Signal, 1)
+		signal.Notify(sig, syscall.SIGTERM, syscall.SIGINT)
+		select {
+		case <-sig:
+			r.cancel()
+		case <-ctx.Done():
+		}
+		return nil
+	})
+}
+
 // Wait all routines and returns first error or nil if all routines completes without errors
 func (r *Rutina) Wait() error {
 	r.wg.Wait()

rutina_test.go

@@ -2,10 +2,9 @@ package rutina
 
 import (
 	"context"
+	"errors"
 	"testing"
 	"time"
-
-	"github.com/pkg/errors"
 )
 
 func TestSuccess(t *testing.T) {