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7c5480f94e
# Eventstore fixes - `event.Position` used float64 before which can lead to [precision loss](https://github.com/golang/go/issues/47300). The type got replaced by [a type without precision loss](https://github.com/jackc/pgx-shopspring-decimal) - the handler reported the wrong error if the current state was updated and therefore took longer to retry failed events. # Mirror fixes - max age of auth requests can be configured to speed up copying data from `auth.auth_requests` table. Auth requests last updated before the set age will be ignored. Default is 1 month - notification projections are skipped because notifications should be sent by the source system. The projections are set to the latest position - ensure that mirror can be executed multiple times
56 lines
1.6 KiB
Go
56 lines
1.6 KiB
Go
package eventstore
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import (
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"time"
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"github.com/shopspring/decimal"
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)
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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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Position decimal.Decimal `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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rm.Position = rm.Events[len(rm.Events)-1].Position()
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// all events processed and not needed anymore
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rm.Events = rm.Events[0:0]
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return nil
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}
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