started work on task assignment table

backend/pkg/db/availabilities/availabilities.go

@@ -0,0 +1,59 @@
+package availabilities
+
+import (
+	"fmt"
+	"time"
+
+	cache "github.com/jfarleyx/go-simple-cache"
+	"github.com/johannesbuehl/golunteer/backend/pkg/db"
+)
+
+type availabilitiesDB struct {
+	Id       int    `db:"id"`
+	Text     string `db:"text"`
+	Disabled bool   `db:"disabled"`
+}
+
+type Availability struct {
+	Text     string
+	Disabled bool
+}
+
+var c *cache.Cache
+
+func Keys() (map[int]Availability, error) {
+	if availabilities, hit := c.Get("availabilities"); !hit {
+		refresh()
+
+		return nil, fmt.Errorf("availabilities not stored cached")
+	} else {
+		return availabilities.(map[int]Availability), nil
+	}
+}
+
+func refresh() {
+	// get the availabilitiesRaw from the database
+	var availabilitiesRaw []availabilitiesDB
+
+	if err := db.DB.Select(&availabilitiesRaw, "SELECT * FROM AVAILABILITIES"); err == nil {
+		// convert the result in a map
+		availabilities := map[int]Availability{}
+
+		for _, a := range availabilitiesRaw {
+			availabilities[a.Id] = Availability{
+				Text:     a.Text,
+				Disabled: a.Disabled,
+			}
+		}
+
+		c.Set("availabilities", availabilities)
+	}
+}
+
+func init() {
+	c = cache.New(24 * time.Hour)
+
+	c.OnExpired(refresh)
+
+	refresh()
+}