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event_store.go
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event_store.go
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package store
import (
"context"
"github.com/EventStore/EventStore-Client-Go/v3/esdb"
es "github.com/openline-ai/openline-customer-os/packages/server/events-processing-platform/eventstore"
"github.com/openline-ai/openline-customer-os/packages/server/events-processing-platform/logger"
"github.com/pkg/errors"
"io"
)
type eventStore struct {
log logger.Logger
db *esdb.Client
}
func NewEventStore(log logger.Logger, db *esdb.Client) *eventStore {
return &eventStore{log: log, db: db}
}
func (eventStore *eventStore) SaveEvents(ctx context.Context, streamID string, events []es.Event) error {
/* Todo Add Tracing
span, ctx := opentracing.StartSpanFromContext(ctx, "eventStore.SaveEvents")
defer span.Finish()
span.LogFields(log.String("AggregateID", streamID))
*/
eventsData := make([]esdb.EventData, 0, len(events))
for _, event := range events {
eventsData = append(eventsData, event.ToEventData())
}
stream, err := eventStore.db.AppendToStream(ctx, streamID, esdb.AppendToStreamOptions{}, eventsData...)
if err != nil {
/*tracing.TraceErr(span, err)*/
eventStore.log.Errorf("Error while saving events: %s", err)
return err
}
eventStore.log.Debugf("SaveEvents stream: %+v", stream)
return nil
}
func (eventStore *eventStore) LoadEvents(ctx context.Context, streamID string) ([]es.Event, error) {
//span, ctx := opentracing.StartSpanFromContext(ctx, "eventStore.LoadEvents")
//defer span.Finish()
//span.LogFields(log.String("AggregateID", streamID))
stream, err := eventStore.db.ReadStream(ctx, streamID, esdb.ReadStreamOptions{
Direction: esdb.Forwards,
From: esdb.Revision(1),
}, 100)
if err != nil {
// tracing.TraceErr(span, err)
eventStore.log.Errorf("Error while loading events: %s", err)
return nil, err
}
defer stream.Close()
events := make([]es.Event, 0, 100)
for {
event, err := stream.Recv()
if errors.Is(err, io.EOF) {
break
}
if err != nil {
//tracing.TraceErr(span, err)
eventStore.log.Errorf("Error while loading events: %s", err)
return nil, err
}
events = append(events, es.NewEventFromRecorded(event.Event))
}
return events, nil
}