HOSTINGDE: Adopt diff2 in compatibility mode (#1890)

providers/hostingde/auditrecords.go

@@ -1,10 +1,17 @@
 package hostingde
 
-import "github.com/StackExchange/dnscontrol/v3/models"
+import (
+	"github.com/StackExchange/dnscontrol/v3/models"
+	"github.com/StackExchange/dnscontrol/v3/pkg/rejectif"
+)
 
 // AuditRecords returns a list of errors corresponding to the records
 // that aren't supported by this provider.  If all records are
 // supported, an empty list is returned.
 func AuditRecords(records []*models.RecordConfig) []error {
-	return nil
+	a := rejectif.Auditor{}
+
+	a.Add("SRV", rejectif.SrvHasNullTarget) // Last verified 2023-01-19
+
+	return a.Audit(records)
 }

providers/hostingde/hostingdeProvider.go

@@ -128,11 +128,13 @@ func (hp *hostingdeProvider) GetDomainCorrections(dc *models.DomainConfig) ([]*m
 		return nil, err
 	}
 
-	var corrections []*models.Correction
-	if !diff2.EnableDiff2 || true { // Remove "|| true" when diff2 version arrives
-
-		differ := diff.New(dc)
-		_, create, del, mod, err := differ.IncrementalDiff(records)
+	var create, del, mod diff.Changeset
+	if !diff2.EnableDiff2 {
+		differ = diff.New(dc)
+	} else {
+		differ = diff.NewCompat(dc)
+	}
+	_, create, del, mod, err = differ.IncrementalDiff(records)
 	if err != nil {
 		return nil, err
 	}
@@ -173,9 +175,24 @@ func (hp *hostingdeProvider) GetDomainCorrections(dc *models.DomainConfig) ([]*m
 			},
 		},
 	}
+
+	msg := []string{}
+	for _, c := range append(del, append(create, mod...)...) {
+		msg = append(msg, c.String())
 	}
 
-	// Insert Future diff2 version here.
+	if len(create) == 0 && len(del) == 0 && len(mod) == 0 {
+		return nil, nil
+	}
+
+	corrections := []*models.Correction{
+		{
+			Msg: fmt.Sprintf("\n%s", strings.Join(msg, "\n")),
+			F: func() error {
+				return hp.updateRecords(dc.Name, create, del, mod)
+			},
+		},
+	}
 
 	return corrections, nil
 }