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b5564572bc
This implementation increases parallel write capabilities of the eventstore. Please have a look at the technical advisories: [05](https://zitadel.com/docs/support/advisory/a10005) and [06](https://zitadel.com/docs/support/advisory/a10006). The implementation of eventstore.push is rewritten and stored events are migrated to a new table `eventstore.events2`. If you are using cockroach: make sure that the database user of ZITADEL has `VIEWACTIVITY` grant. This is used to query events.
51 lines
1.4 KiB
Go
51 lines
1.4 KiB
Go
package eventstore
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import "time"
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// ReadModel is the minimum representation of a read model.
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// It implements a basic reducer
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// it might be saved in a database or in memory
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type ReadModel struct {
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AggregateID string `json:"-"`
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ProcessedSequence uint64 `json:"-"`
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CreationDate time.Time `json:"-"`
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ChangeDate time.Time `json:"-"`
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Events []Event `json:"-"`
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ResourceOwner string `json:"-"`
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InstanceID string `json:"-"`
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}
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// AppendEvents adds all the events to the read model.
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// The function doesn't compute the new state of the read model
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func (rm *ReadModel) AppendEvents(events ...Event) {
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rm.Events = append(rm.Events, events...)
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}
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// Reduce is the basic implementation of reducer
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// If this function is extended the extending function should be the last step
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func (rm *ReadModel) Reduce() error {
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if len(rm.Events) == 0 {
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return nil
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}
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if rm.AggregateID == "" {
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rm.AggregateID = rm.Events[0].Aggregate().ID
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}
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if rm.ResourceOwner == "" {
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rm.ResourceOwner = rm.Events[0].Aggregate().ResourceOwner
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}
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if rm.InstanceID == "" {
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rm.InstanceID = rm.Events[0].Aggregate().InstanceID
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}
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if rm.CreationDate.IsZero() {
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rm.CreationDate = rm.Events[0].CreatedAt()
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}
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rm.ChangeDate = rm.Events[len(rm.Events)-1].CreatedAt()
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rm.ProcessedSequence = rm.Events[len(rm.Events)-1].Sequence()
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// all events processed and not needed anymore
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rm.Events = nil
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rm.Events = []Event{}
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return nil
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}
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