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iterator.go
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/
iterator.go
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package firestore
import (
"strings"
"cloud.google.com/go/firestore"
"github.com/burlingtonbertie99/mykeys/dstore"
"github.com/burlingtonbertie99/mykeys/dstore/events"
"github.com/burlingtonbertie99/mykeys/tsutil"
"google.golang.org/api/iterator"
)
type docsIterator struct {
iter *firestore.DocumentIterator
prefix string
parent string
pathOnly bool
}
func (i *docsIterator) Next() (*dstore.Document, error) {
if i.iter == nil {
return nil, nil
}
doc, err := i.iter.Next()
if err == iterator.Done {
return nil, nil
}
if err != nil {
return nil, err
}
k := doc.Ref.ID
if i.prefix != "" && !strings.HasPrefix(k, i.prefix) {
// We've reached an entry not matching prefix, so end iteration
// TODO: Is there a more efficient way to do this in the query?
return nil, nil
}
kp := dstore.Path(i.parent, k)
if i.pathOnly {
out := dstore.NewDocument(kp)
out.CreatedAt = doc.CreateTime
out.UpdatedAt = doc.UpdateTime
return out, nil
}
out := dstore.NewDocument(kp).With(doc.Data())
out.CreatedAt = doc.CreateTime
out.UpdatedAt = doc.UpdateTime
return out, nil
}
func (i *docsIterator) Release() {
if i.iter != nil {
i.iter.Stop()
}
}
type eventIterator struct {
iter *firestore.DocumentIterator
limit int64
count int64
}
func (i *eventIterator) Next() (*events.Event, error) {
if i.iter == nil {
return nil, nil
}
doc, err := i.iter.Next()
if err == iterator.Done {
return nil, nil
}
if err != nil {
return nil, err
}
if i.limit != 0 && i.count >= i.limit {
return nil, nil
}
d := doc.Data()
idx := d["idx"].(int64)
event := &events.Event{
Document: d,
Index: idx,
Timestamp: tsutil.Millis(doc.CreateTime),
}
i.count++
return event, nil
}
func (i *eventIterator) Release() {
if i.iter != nil {
i.iter.Stop()
}
}