♻️ Modify UUID to allow for other versions.

gen_rand.go

@@ -8,17 +8,44 @@ import (
 	"github.com/google/uuid"
 )
 
-func uuidGen(*Config) (string, error) {
-	u, err := uuid.NewRandom()
-	if err != nil {
-		return "", err
-	}
-	return u.String(), nil
+// UUIDer is an interface for generating UUIDs.
+// It is recommended that you use either the UUIDv4 or UUIDv7 variables.
+type UUIDer interface {
+	UUID() (uuid.UUID, error)
 }
 
-// UUID generates a UUIDv4.
-func UUID() Generator {
-	return uuidGen
+// UUIDFunc is a function that generates a UUID.
+type UUIDFunc func() (uuid.UUID, error)
+
+// UUID allows UUIDFunc to be used as a UUIDer.
+func (u UUIDFunc) UUID() (uuid.UUID, error) {
+	return u()
+}
+
+var (
+	// UUIDv1. You probably don't want to use this. It is included for completeness sake.
+	UUIDv1 = UUIDFunc(uuid.NewUUID)
+	// UUIDv4 is the default.
+	UUIDv4 = UUIDFunc(uuid.NewRandom)
+	// UUIDv6 is primarily a replacement for UUIDv1. You probably should use 4 or 7.
+	UUIDv6 = UUIDFunc(uuid.NewV6)
+	// UUIDv7 should be used if you want it sortable by time.
+	UUIDv7 = UUIDFunc(uuid.NewV7)
+)
+
+// UUID generates a UUID. If nil.is passed as an argument,
+// a UUIDv4 is generated.
+func UUID(u UUIDer) Generator {
+	if u == nil {
+		u = UUIDv4
+	}
+	return func(*Config) (string, error) {
+		uu, err := u.UUID()
+		if err != nil {
+			return "", err
+		}
+		return uu.String(), nil
+	}
 }
 
 type randConf struct {