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https://github.com/zitadel/zitadel.git
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56b916a2b0
* begin init checks for projections * first projection checks * debug notification providers with query fixes * more projections and first index * more projections * more projections * finish projections * fix tests (remove db name) * create tables in setup * fix logging / error handling * add tenant to views * rename tenant to instance_id * add instance_id to all projections * add instance_id to all queries * correct instance_id on projections * add instance_id to failed_events * use separate context for instance * implement features projection * implement features projection * remove unique constraint from setup when migration failed * add error to failed setup event * add instance_id to primary keys * fix IAM projection * remove old migrations folder * fix keysFromYAML test
52 lines
1.5 KiB
Go
52 lines
1.5 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) *ReadModel {
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rm.Events = append(rm.Events, events...)
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return rm
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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].CreationDate()
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}
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rm.ChangeDate = rm.Events[len(rm.Events)-1].CreationDate()
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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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