feat: administrator (#271)

* feat: get views and failed events

* feat: get views and failed events

* feat: get views and failed events

* Update internal/view/repository/sequence.go

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

* Update internal/view/repository/general_query.go

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

Co-authored-by: Livio Amstutz <livio.a@gmail.com>

internal/view/repository/sequence.go

@@ -0,0 +1,88 @@
+package repository
+
+import (
+	caos_errs "github.com/caos/zitadel/internal/errors"
+	"github.com/caos/zitadel/internal/view/model"
+	"github.com/jinzhu/gorm"
+	"strings"
+)
+
+type actualSequece struct {
+	ActualSequence uint64 `gorm:"column:current_sequence"`
+}
+
+type CurrentSequence struct {
+	ViewName        string `gorm:"column:view_name;primary_key"`
+	CurrentSequence uint64 `gorm:"column:current_sequence"`
+}
+
+type SequenceSearchKey int32
+
+const (
+	SequenceSearchKeyUndefined SequenceSearchKey = iota
+	SequenceSearchKeyViewName
+)
+
+type sequenceSearchKey SequenceSearchKey
+
+func (key sequenceSearchKey) ToColumnName() string {
+	switch SequenceSearchKey(key) {
+	case SequenceSearchKeyViewName:
+		return "view_name"
+	default:
+		return ""
+	}
+}
+
+func CurrentSequenceToModel(sequence *CurrentSequence) *model.View {
+	dbView := strings.Split(sequence.ViewName, ".")
+	return &model.View{
+		Database:        dbView[0],
+		ViewName:        dbView[1],
+		CurrentSequence: sequence.CurrentSequence,
+	}
+}
+
+func SaveCurrentSequence(db *gorm.DB, table, viewName string, sequence uint64) error {
+	save := PrepareSave(table)
+	err := save(db, &CurrentSequence{viewName, sequence})
+
+	if err != nil {
+		return caos_errs.ThrowInternal(err, "VIEW-5kOhP", "unable to updated processed sequence")
+	}
+	return nil
+}
+
+func LatestSequence(db *gorm.DB, table, viewName string) (uint64, error) {
+	sequence := new(actualSequece)
+	query := PrepareGetByKey(table, sequenceSearchKey(SequenceSearchKeyViewName), viewName)
+	err := query(db, sequence)
+
+	if err == nil {
+		return sequence.ActualSequence, nil
+	}
+
+	if caos_errs.IsNotFound(err) {
+		return 0, nil
+	}
+	return 0, caos_errs.ThrowInternalf(err, "VIEW-9LyCB", "unable to get latest sequence of %s", viewName)
+}
+
+func AllCurrentSequences(db *gorm.DB, table string) ([]*CurrentSequence, error) {
+	sequences := make([]*CurrentSequence, 0)
+	query := PrepareSearchQuery(table, GeneralSearchRequest{})
+	_, err := query(db, &sequences)
+	if err != nil {
+		return nil, err
+	}
+	return sequences, nil
+}
+
+func ClearView(db *gorm.DB, truncateView, sequenceTable string) error {
+	truncate := PrepareTruncate(truncateView)
+	err := truncate(db)
+	if err != nil {
+		return err
+	}
+	return SaveCurrentSequence(db, sequenceTable, truncateView, 0)
+}