Move WissKI Parts to new ingredients system

internal/wisski/ingredient/barrel/build.go

@@ -0,0 +1,63 @@
+package barrel
+
+import (
+	"time"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/dis/component"
+	"github.com/FAU-CDI/wisski-distillery/internal/dis/component/meta"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient/locker"
+	"github.com/FAU-CDI/wisski-distillery/internal/wisski/ingredient/mstore"
+	"github.com/tkw1536/goprogram/stream"
+)
+
+// Build builds or rebuilds the barel connected to this instance.
+//
+// It also logs the current time into the metadata belonging to this instance.
+func (barrel *Barrel) Build(stream stream.IOStream, start bool) error {
+	if !barrel.Locker.TryLock() {
+		err := locker.Locked
+		return err
+	}
+	defer barrel.Locker.Unlock()
+
+	stack := barrel.Stack()
+
+	var context component.InstallationContext
+
+	{
+		err := stack.Install(stream, context)
+		if err != nil {
+			return err
+		}
+	}
+
+	{
+		err := stack.Update(stream, start)
+		if err != nil {
+			return err
+		}
+	}
+
+	// store the current last rebuild
+	return barrel.setLastRebuild()
+}
+
+// TODO: Move this to time.Time
+var lastRebuild = mstore.For[int64]("lastRebuild")
+
+func (barrel Barrel) LastRebuild() (t time.Time, err error) {
+	epoch, err := lastRebuild.Get(barrel.MStore)
+	if err == meta.ErrMetadatumNotSet {
+		return t, nil
+	}
+	if err != nil {
+		return t, err
+	}
+
+	// and turn it into time!
+	return time.Unix(epoch, 0), nil
+}
+
+func (barrel *Barrel) setLastRebuild() error {
+	return lastRebuild.Set(barrel.MStore, time.Now().Unix())
+}