Allow server to make backups

internal/component/info/index.go

@@ -0,0 +1,85 @@
+package info
+
+import (
+	"html/template"
+	"net/http"
+	"time"
+
+	_ "embed"
+
+	"github.com/FAU-CDI/wisski-distillery/internal/component/instances"
+	"github.com/FAU-CDI/wisski-distillery/internal/config"
+	"github.com/FAU-CDI/wisski-distillery/internal/models"
+	"golang.org/x/sync/errgroup"
+)
+
+//go:embed "html/index.html"
+var indexTemplateStr string
+var indexTemplate = template.Must(template.New("index.html").Parse(indexTemplateStr))
+
+type indexPageContext struct {
+	Time time.Time
+
+	Config *config.Config
+
+	Instances []instances.WissKIInfo
+
+	TotalCount   int
+	RunningCount int
+	StoppedCount int
+
+	Backups []models.Snapshot
+}
+
+func (info *Info) indexPageAPI(r *http.Request) (idx indexPageContext, err error) {
+	var group errgroup.Group
+
+	group.Go(func() error {
+		// list all the instances
+		all, err := info.Instances.All()
+		if err != nil {
+			return err
+		}
+
+		// get all of their info!
+		idx.Instances = make([]instances.WissKIInfo, len(all))
+		for i, instance := range all {
+			{
+				i := i
+				instance := instance
+
+				// store the info for this group!
+				group.Go(func() (err error) {
+					idx.Instances[i], err = instance.Info(true)
+					return err
+				})
+			}
+		}
+
+		return nil
+	})
+
+	// get the log entries
+	group.Go(func() (err error) {
+		idx.Backups, err = info.Instances.SnapshotLogFor("")
+		return
+	})
+
+	// get the static properties
+	idx.Config = info.Config
+	idx.Time = time.Now().UTC()
+
+	group.Wait()
+
+	// count how many are running and how many are stopped
+	for _, i := range idx.Instances {
+		if i.Running {
+			idx.RunningCount++
+		} else {
+			idx.StoppedCount++
+		}
+	}
+	idx.TotalCount = len(idx.Instances)
+
+	return
+}