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twins.go
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twins.go
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// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0
package mongodb
import (
"context"
"github.com/absmach/magistrala/pkg/errors"
"github.com/absmach/magistrala/twins"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
const (
maxNameSize = 1024
twinsCollection string = "twins"
)
type twinRepository struct {
db *mongo.Database
}
var _ twins.TwinRepository = (*twinRepository)(nil)
// NewTwinRepository instantiates a MongoDB implementation of twin repository.
func NewTwinRepository(db *mongo.Database) twins.TwinRepository {
return &twinRepository{
db: db,
}
}
func (tr *twinRepository) Save(ctx context.Context, tw twins.Twin) (string, error) {
if len(tw.Name) > maxNameSize {
return "", errors.ErrMalformedEntity
}
coll := tr.db.Collection(twinsCollection)
if _, err := coll.InsertOne(ctx, tw); err != nil {
return "", errors.Wrap(errors.ErrCreateEntity, err)
}
return tw.ID, nil
}
func (tr *twinRepository) Update(ctx context.Context, tw twins.Twin) error {
if len(tw.Name) > maxNameSize {
return errors.ErrMalformedEntity
}
coll := tr.db.Collection(twinsCollection)
filter := bson.M{"id": tw.ID}
update := bson.M{"$set": tw}
res, err := coll.UpdateOne(ctx, filter, update)
if err != nil {
return err
}
if res.ModifiedCount < 1 {
return errors.ErrNotFound
}
return nil
}
func (tr *twinRepository) RetrieveByID(ctx context.Context, twinID string) (twins.Twin, error) {
coll := tr.db.Collection(twinsCollection)
var tw twins.Twin
filter := bson.M{"id": twinID}
if err := coll.FindOne(ctx, filter).Decode(&tw); err != nil {
return tw, errors.ErrNotFound
}
return tw, nil
}
func (tr *twinRepository) RetrieveByAttribute(ctx context.Context, channel, subtopic string) ([]string, error) {
coll := tr.db.Collection(twinsCollection)
findOptions := options.Aggregate()
prj1 := bson.M{
"$project": bson.M{
"definition": bson.M{
"$arrayElemAt": []interface{}{"$definitions.attributes", -1},
},
"id": true,
"_id": 0,
},
}
match := bson.M{
"$match": bson.M{
"definition.channel": channel,
"$or": []interface{}{
bson.M{"definition.subtopic": subtopic},
bson.M{"definition.subtopic": twins.SubtopicWildcard},
},
},
}
prj2 := bson.M{
"$project": bson.M{
"id": true,
},
}
cur, err := coll.Aggregate(ctx, []bson.M{prj1, match, prj2}, findOptions)
if err != nil {
return []string{}, errors.Wrap(errors.ErrViewEntity, err)
}
defer cur.Close(ctx)
if err := cur.Err(); err != nil {
return []string{}, nil
}
var ids []string
for cur.Next(ctx) {
var elem struct {
ID string `json:"id"`
}
err := cur.Decode(&elem)
if err != nil {
return ids, nil
}
ids = append(ids, elem.ID)
}
return ids, nil
}
func (tr *twinRepository) RetrieveAll(ctx context.Context, owner string, offset, limit uint64, name string, metadata twins.Metadata) (twins.Page, error) {
coll := tr.db.Collection(twinsCollection)
findOptions := options.Find()
findOptions.SetSkip(int64(offset))
findOptions.SetLimit(int64(limit))
filter := bson.M{}
if owner != "" {
filter["owner"] = owner
}
if name != "" {
filter["name"] = name
}
if len(metadata) > 0 {
filter["metadata"] = metadata
}
cur, err := coll.Find(ctx, filter, findOptions)
if err != nil {
return twins.Page{}, errors.Wrap(errors.ErrViewEntity, err)
}
results, err := decodeTwins(ctx, cur)
if err != nil {
return twins.Page{}, errors.Wrap(errors.ErrViewEntity, err)
}
total, err := coll.CountDocuments(ctx, filter)
if err != nil {
return twins.Page{}, errors.Wrap(errors.ErrViewEntity, err)
}
return twins.Page{
Twins: results,
PageMetadata: twins.PageMetadata{
Total: uint64(total),
Offset: offset,
Limit: limit,
},
}, nil
}
func (tr *twinRepository) Remove(ctx context.Context, twinID string) error {
coll := tr.db.Collection(twinsCollection)
filter := bson.M{"id": twinID}
res, err := coll.DeleteOne(ctx, filter)
if err != nil {
return errors.Wrap(errors.ErrRemoveEntity, err)
}
if res.DeletedCount < 1 {
return errors.ErrNotFound
}
return nil
}
func decodeTwins(ctx context.Context, cur *mongo.Cursor) ([]twins.Twin, error) {
defer cur.Close(ctx)
var results []twins.Twin
for cur.Next(ctx) {
var elem twins.Twin
err := cur.Decode(&elem)
if err != nil {
return []twins.Twin{}, nil
}
results = append(results, elem)
}
if err := cur.Err(); err != nil {
return []twins.Twin{}, nil
}
return results, nil
}