Added a convenient Service type

service/service.go

@@ -1,2 +1,61 @@
 // Package service provides a toolkit for creating Hnakra services.
 package service
+
+import "os"
+import "log"
+import "time"
+import "hnakra/rotate"
+import "hnakra/routines"
+
+// Service is capable of managing multiple mounts. It also sets up logging
+// automatically.
+type Service []Mount
+
+// Run runs the mounts within the service, and only exits when all of them have
+// exited. It will automatically start logging to the directory specified by
+// $HNAKRA_LOG_DIR. If that variable is unset, it will just log to stdout.
+func (service Service) Run () error {
+	// set up logging
+	logDir := os.Getenv("HNAKRA_LOG_DIR")
+	if logDir != "" {
+		logger, err := rotate.New(logDir)
+		if err != nil { log.Fatal("cannot access log dir:", err) }
+		log.SetOutput(logger)
+	}
+
+	// set up routine manager
+	manager := routines.Manager { RestartDeadline: time.Second * 8 }
+	manager.Routines = make([]routines.Routine, len(service))
+	for index, mount := range manager.Routines {
+		manager.Routines[index] = mount
+	}
+
+	// send it
+	err := manager.Run()
+	if err != nil { log.Println("XXX", err) }
+	return err
+}
+
+// Close abruptly closes all mounts in the service. This will cause Run() to
+// exit.
+func (service Service) Close () (err error) {
+	for _, mount := range service {
+		singleErr := mount.Close()
+		if singleErr != nil {
+			err = singleErr
+		}
+	}
+	return
+}
+
+// Shutdown gracefully shuts down each mount in the service. This will cause
+// Run() to exit.
+func (service Service) Shutdown () (err error) {
+	for _, mount := range service {
+		singleErr := mount.Shutdown()
+		if singleErr != nil {
+			err = singleErr
+		}
+	}
+	return
+}