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consumer.go
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consumer.go
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// Copyright (c) Abstract Machines
// SPDX-License-Identifier: Apache-2.0
package mongodb
import (
"context"
"github.com/absmach/magistrala/consumers"
"github.com/absmach/magistrala/pkg/errors"
"github.com/absmach/magistrala/pkg/transformers/json"
"github.com/absmach/magistrala/pkg/transformers/senml"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/mongo"
)
const senmlCollection string = "messages"
var errSaveMessage = errors.New("failed to save message to mongodb database")
var _ consumers.BlockingConsumer = (*mongoRepo)(nil)
type mongoRepo struct {
db *mongo.Database
}
// New returns new MongoDB writer.
func New(db *mongo.Database) consumers.BlockingConsumer {
return &mongoRepo{db}
}
func (repo *mongoRepo) ConsumeBlocking(ctx context.Context, message interface{}) error {
switch m := message.(type) {
case json.Messages:
return repo.saveJSON(ctx, m)
default:
return repo.saveSenml(ctx, m)
}
}
func (repo *mongoRepo) saveSenml(ctx context.Context, messages interface{}) error {
msgs, ok := messages.([]senml.Message)
if !ok {
return errSaveMessage
}
coll := repo.db.Collection(senmlCollection)
var dbMsgs []interface{}
for _, msg := range msgs {
// Check if message is already in database.
filter := bson.M{"time": msg.Time, "publisher": msg.Publisher, "subtopic": msg.Subtopic, "name": msg.Name}
count, err := coll.CountDocuments(ctx, filter)
if err != nil {
return errors.Wrap(errSaveMessage, err)
}
if count == 0 {
dbMsgs = append(dbMsgs, msg)
}
}
_, err := coll.InsertMany(ctx, dbMsgs)
if err != nil {
return errors.Wrap(errSaveMessage, err)
}
return nil
}
func (repo *mongoRepo) saveJSON(ctx context.Context, msgs json.Messages) error {
m := []interface{}{}
for _, msg := range msgs.Data {
m = append(m, msg)
}
coll := repo.db.Collection(msgs.Format)
_, err := coll.InsertMany(ctx, m)
if err != nil {
return errors.Wrap(errSaveMessage, err)
}
return nil
}