/
storage.go
123 lines (99 loc) · 2.91 KB
/
storage.go
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package mongodb
import (
"context"
"errors"
"fmt"
"github.com/mmadfox/gpsgend/internal/generator"
"github.com/mmadfox/gpsgend/internal/types"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
)
const (
fieldTrackerID = "tracker_id"
)
type Storage struct {
collection Collection
}
func New(c Collection) *Storage {
return &Storage{collection: c}
}
func (s *Storage) Insert(ctx context.Context, t *generator.Tracker) error {
if t == nil {
return fmt.Errorf("%w: storage.Insert() *Tracker is nil",
generator.ErrNoTracker)
}
doc := new(generator.TrackerSnapshot)
t.TakeSnapshot(doc)
if len(doc.ID) == 0 {
return fmt.Errorf("%w: storage.Insert() *Tracker is invalid",
generator.ErrNoTracker)
}
if _, err := s.collection.InsertOne(ctx, doc); err != nil {
return fmt.Errorf("%w: %v", generator.ErrStorageInsert, err)
}
return nil
}
func (s *Storage) Find(ctx context.Context, trackerID types.ID) (*generator.Tracker, error) {
if trackerID.IsEmpty() {
return nil, fmt.Errorf("%w: storage.Find() trackerID is empty",
types.ErrInvalidID)
}
filter := bson.M{fieldTrackerID: trackerID.String()}
result := s.collection.FindOne(ctx, filter)
if result.Err() != nil {
if errors.Is(result.Err(), mongo.ErrNoDocuments) {
return nil, fmt.Errorf("%w: %v",
generator.ErrTrackerNotFound, result.Err())
}
return nil, fmt.Errorf("%w: %v",
generator.ErrStorageFind, result.Err())
}
doc := new(generator.TrackerSnapshot)
if err := result.Decode(doc); err != nil {
return nil, fmt.Errorf("%w: decode from mongodb: %v",
generator.ErrBrokenTracker, err)
}
trk := new(generator.Tracker)
if err := trk.FromSnapshot(doc); err != nil {
return nil, fmt.Errorf("%w: decode from snapshot: %v",
generator.ErrBrokenTracker, err)
}
return trk, nil
}
func (s *Storage) Delete(ctx context.Context, trackerID types.ID) error {
if trackerID.IsEmpty() {
return fmt.Errorf("%w: storage.Delete() trackerID is empty",
types.ErrInvalidID)
}
filter := bson.M{fieldTrackerID: trackerID.String()}
if _, err := s.collection.DeleteOne(ctx, filter); err != nil {
return fmt.Errorf("%w: %v", generator.ErrStorageDelete, err)
}
return nil
}
func (s *Storage) Update(ctx context.Context, t *generator.Tracker) error {
if t == nil {
return fmt.Errorf("%w: storage.Update() *Tracker is nil",
generator.ErrNoTracker)
}
doc := new(generator.TrackerSnapshot)
t.TakeSnapshot(doc)
filter := bson.M{
fieldTrackerID: doc.ID,
"version": doc.Version,
}
doc.Version += 1
// reset for updates
doc.ID = ""
update := bson.M{"$set": doc}
res, err := s.collection.UpdateOne(ctx, filter, update)
if err != nil {
return fmt.Errorf("%w: %v", generator.ErrStorageUpdate, err)
}
if res.MatchedCount == 0 && res.ModifiedCount == 0 {
return fmt.Errorf("%w: storage.Update(), expected %d",
generator.ErrInvalidTrackerVersion, doc.Version)
}
return nil
}
var _ generator.Storage = &Storage{}