/
eventmaintenance.go
126 lines (112 loc) · 3.41 KB
/
eventmaintenance.go
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// Copyright (c) 2015 - The Event Horizon authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mongodb
import (
"context"
"fmt"
"go.mongodb.org/mongo-driver/bson"
// Register uuid.UUID as BSON type.
_ "github.com/looplab/eventhorizon/codec/bson"
eh "github.com/looplab/eventhorizon"
)
// Replace implements the Replace method of the eventhorizon.EventStore interface.
func (s *EventStore) Replace(ctx context.Context, event eh.Event) error {
id := event.AggregateID()
at := event.AggregateType()
av := event.Version()
// First check if the aggregate exists, the not found error in the update
// query can mean both that the aggregate or the event is not found.
if n, err := s.aggregates.CountDocuments(ctx, bson.M{"_id": id}); n == 0 {
return &eh.EventStoreError{
Err: eh.ErrAggregateNotFound,
Op: eh.EventStoreOpReplace,
AggregateType: at,
AggregateID: id,
AggregateVersion: av,
Events: []eh.Event{event},
}
} else if err != nil {
return &eh.EventStoreError{
Err: fmt.Errorf("could not check aggregate existence: %w", err),
Op: eh.EventStoreOpReplace,
AggregateType: at,
AggregateID: id,
AggregateVersion: av,
Events: []eh.Event{event},
}
}
// Create the event record for the Database.
e, err := newEvt(ctx, event)
if err != nil {
return err
}
// Find and replace the event.
if r, err := s.aggregates.UpdateOne(ctx,
bson.M{
"_id": event.AggregateID(),
"events.version": event.Version(),
},
bson.M{
"$set": bson.M{"events.$": *e},
},
); err != nil {
return &eh.EventStoreError{
Err: err,
Op: eh.EventStoreOpReplace,
AggregateType: at,
AggregateID: id,
AggregateVersion: av,
Events: []eh.Event{event},
}
} else if r.MatchedCount == 0 {
return &eh.EventStoreError{
Err: eh.ErrEventNotFound,
Op: eh.EventStoreOpReplace,
AggregateType: at,
AggregateID: id,
AggregateVersion: av,
Events: []eh.Event{event},
}
}
return nil
}
// RenameEvent implements the RenameEvent method of the eventhorizon.EventStore interface.
func (s *EventStore) RenameEvent(ctx context.Context, from, to eh.EventType) error {
// Find and rename all events.
// TODO: Maybe use change info.
if _, err := s.aggregates.UpdateMany(ctx,
bson.M{
"events.event_type": from.String(),
},
bson.M{
"$set": bson.M{"events.$.event_type": to.String()},
},
); err != nil {
return &eh.EventStoreError{
Err: fmt.Errorf("could not update events of type '%s': %w", from, err),
Op: eh.EventStoreOpRename,
}
}
return nil
}
// Clear clears the event storage.
func (s *EventStore) Clear(ctx context.Context) error {
if err := s.aggregates.Drop(ctx); err != nil {
return &eh.EventStoreError{
Err: err,
Op: eh.EventStoreOpRename,
}
}
return nil
}