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sensorscollection.go
61 lines (50 loc) · 1.14 KB
/
sensorscollection.go
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package main
import (
"cloud.google.com/go/firestore"
"context"
"errors"
"google.golang.org/api/iterator"
)
var ErrSensorEOF = errors.New("no more sensors")
type SensorIteratable interface {
Next(ctx context.Context, s *Sensor) error
Stop()
Store(ctx context.Context, s Sensor) error
}
type SensorCollection struct {
collection *firestore.CollectionRef
iterator *firestore.DocumentIterator
}
func (s *SensorCollection) Next(ctx context.Context, sensor *Sensor) error {
if s.iterator == nil {
s.iterator = s.collection.Documents(ctx)
}
snapshot, err := s.iterator.Next()
if err != nil {
if err == iterator.Done {
return ErrSensorEOF
}
return err
}
if err := snapshot.DataTo(&sensor); err != nil {
return err
}
sensor.DocumentID = snapshot.Ref.ID
return nil
}
func (s *SensorCollection) Stop() {
if s.iterator != nil {
s.iterator.Stop()
}
s.iterator = nil
}
func (a *SensorCollection) Store(ctx context.Context, sensor Sensor) error {
doc := a.collection.Doc(sensor.DocumentID)
_, err := doc.Update(ctx, []firestore.Update{
{Path: "alarms", Value: sensor.Alarms},
})
if err != nil {
return err
}
return nil
}