component/dis: Check if instance alive

internal/component/instances/wisski_status.go

@@ -0,0 +1,22 @@
+package instances
+
+import "github.com/tkw1536/goprogram/stream"
+
+// Info represents some info about this WissKI
+type Info struct {
+	Slug string // The slug of the instance
+
+	Running bool // is the instance running?
+}
+
+// Info returns info about this instance
+func (wisski *WissKI) Info() (info Info, err error) {
+	info.Slug = wisski.Slug
+
+	ps, err := wisski.Barrel().Ps(stream.FromNil())
+	if err != nil {
+		return
+	}
+	info.Running = len(ps) > 0
+	return
+}