fix: scheduling (#3978)

* fix: improve scheduling

* build pre-release

* fix: locker

* fix: user handler and print stack in case of panic in reducer

* chore: remove sentry

* fix: improve handler projection and implement tests

* more tests

* fix: race condition in tests

* Update internal/eventstore/repository/sql/query.go

Co-authored-by: Silvan <silvan.reusser@gmail.com>

* fix: implemented suggested changes

* fix: lock statement

Co-authored-by: Silvan <silvan.reusser@gmail.com>

internal/eventstore/repository/sql/crdb.go

@@ -218,7 +218,7 @@ func (db *CRDB) Filter(ctx context.Context, searchQuery *repository.SearchQuery)
 	return events, nil
 }
 
-//LatestSequence returns the latests sequence found by the the search query
+//LatestSequence returns the latest sequence found by the search query
 func (db *CRDB) LatestSequence(ctx context.Context, searchQuery *repository.SearchQuery) (uint64, error) {
 	var seq Sequence
 	err := query(ctx, db, searchQuery, &seq)
@@ -228,6 +228,16 @@ func (db *CRDB) LatestSequence(ctx context.Context, searchQuery *repository.Sear
 	return uint64(seq), nil
 }
 
+//InstanceIDs returns the instance ids found by the search query
+func (db *CRDB) InstanceIDs(ctx context.Context, searchQuery *repository.SearchQuery) ([]string, error) {
+	var ids []string
+	err := query(ctx, db, searchQuery, &ids)
+	if err != nil {
+		return nil, err
+	}
+	return ids, nil
+}
+
 func (db *CRDB) db() *sql.DB {
 	return db.client
 }
@@ -262,6 +272,10 @@ func (db *CRDB) maxSequenceQuery() string {
 	return "SELECT MAX(event_sequence) FROM eventstore.events"
 }
 
+func (db *CRDB) instanceIDsQuery() string {
+	return "SELECT DISTINCT instance_id FROM eventstore.events"
+}
+
 func (db *CRDB) columnName(col repository.Field) string {
 	switch col {
 	case repository.FieldAggregateID:

internal/eventstore/repository/sql/query.go

@@ -22,6 +22,7 @@ type querier interface {
 	placeholder(query string) string
 	eventQuery() string
 	maxSequenceQuery() string
+	instanceIDsQuery() string
 	db() *sql.DB
 	orderByEventSequence(desc bool) string
 }
@@ -36,7 +37,7 @@ func query(ctx context.Context, criteria querier, searchQuery *repository.Search
 	}
 	query += where
 
-	if searchQuery.Columns != repository.ColumnsMaxSequence {
+	if searchQuery.Columns == repository.ColumnsEvent {
 		query += criteria.orderByEventSequence(searchQuery.Desc)
 	}
 
@@ -76,6 +77,8 @@ func prepareColumns(criteria querier, columns repository.Columns) (string, func(
 	switch columns {
 	case repository.ColumnsMaxSequence:
 		return criteria.maxSequenceQuery(), maxSequenceScanner
+	case repository.ColumnsInstanceIDs:
+		return criteria.instanceIDsQuery(), instanceIDsScanner
 	case repository.ColumnsEvent:
 		return criteria.eventQuery(), eventsScanner
 	default:
@@ -95,6 +98,22 @@ func maxSequenceScanner(row scan, dest interface{}) (err error) {
 	return z_errors.ThrowInternal(err, "SQL-bN5xg", "something went wrong")
 }
 
+func instanceIDsScanner(scanner scan, dest interface{}) (err error) {
+	ids, ok := dest.(*[]string)
+	if !ok {
+		return z_errors.ThrowInvalidArgument(nil, "SQL-Begh2", "type must be an array of string")
+	}
+	var id string
+	err = scanner(&id)
+	if err != nil {
+		logging.WithError(err).Warn("unable to scan row")
+		return z_errors.ThrowInternal(err, "SQL-DEFGe", "unable to scan row")
+	}
+	*ids = append(*ids, id)
+
+	return nil
+}
+
 func eventsScanner(scanner scan, dest interface{}) (err error) {
 	events, ok := dest.(*[]*repository.Event)
 	if !ok {
@@ -157,7 +176,7 @@ func prepareCondition(criteria querier, filters [][]*repository.Filter) (clause
 				var err error
 				value, err = json.Marshal(value)
 				if err != nil {
-					logging.New().WithError(err).Warn("unable to marshal search value")
+					logging.WithError(err).Warn("unable to marshal search value")
 					continue
 				}
 			}