103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
// Copyright (c) Mainflux
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// SPDX-License-Identifier: Apache-2.0
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package cassandra
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import (
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"context"
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"encoding/json"
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"fmt"
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"github.com/gocql/gocql"
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"github.com/mainflux/mainflux/consumers"
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"github.com/mainflux/mainflux/pkg/errors"
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mfjson "github.com/mainflux/mainflux/pkg/transformers/json"
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"github.com/mainflux/mainflux/pkg/transformers/senml"
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)
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var (
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errSaveMessage = errors.New("failed to save message to cassandra database")
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errNoTable = errors.New("table does not exist")
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)
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var _ consumers.BlockingConsumer = (*cassandraRepository)(nil)
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type cassandraRepository struct {
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session *gocql.Session
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}
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// New instantiates Cassandra message repository.
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func New(session *gocql.Session) consumers.BlockingConsumer {
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return &cassandraRepository{session}
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}
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func (cr *cassandraRepository) ConsumeBlocking(_ context.Context, message interface{}) error {
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switch m := message.(type) {
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case mfjson.Messages:
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return cr.saveJSON(m)
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default:
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return cr.saveSenml(m)
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}
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}
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func (cr *cassandraRepository) saveSenml(messages interface{}) error {
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msgs, ok := messages.([]senml.Message)
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if !ok {
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return errSaveMessage
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}
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cql := `INSERT INTO messages (id, channel, subtopic, publisher, protocol,
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name, unit, value, string_value, bool_value, data_value, sum,
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time, update_time)
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VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`
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id := gocql.TimeUUID()
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for _, msg := range msgs {
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err := cr.session.Query(cql, id, msg.Channel, msg.Subtopic, msg.Publisher,
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msg.Protocol, msg.Name, msg.Unit, msg.Value, msg.StringValue,
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msg.BoolValue, msg.DataValue, msg.Sum, msg.Time, msg.UpdateTime).Exec()
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if err != nil {
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return errors.Wrap(errSaveMessage, err)
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}
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}
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return nil
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}
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func (cr *cassandraRepository) saveJSON(msgs mfjson.Messages) error {
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if err := cr.insertJSON(msgs); err != nil {
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if err == errNoTable {
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if err := cr.createTable(msgs.Format); err != nil {
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return err
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}
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return cr.insertJSON(msgs)
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}
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return err
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}
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return nil
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}
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func (cr *cassandraRepository) insertJSON(msgs mfjson.Messages) error {
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cql := `INSERT INTO %s (id, channel, created, subtopic, publisher, protocol, payload) VALUES (?, ?, ?, ?, ?, ?, ?)`
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cql = fmt.Sprintf(cql, msgs.Format)
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for _, msg := range msgs.Data {
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pld, err := json.Marshal(msg.Payload)
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if err != nil {
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return err
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}
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id := gocql.TimeUUID()
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err = cr.session.Query(cql, id, msg.Channel, msg.Created, msg.Subtopic, msg.Publisher, msg.Protocol, string(pld)).Exec()
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if err != nil {
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if err.Error() == fmt.Sprintf("unconfigured table %s", msgs.Format) {
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return errNoTable
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}
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return errors.Wrap(errSaveMessage, err)
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}
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}
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return nil
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}
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func (cr *cassandraRepository) createTable(name string) error {
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q := fmt.Sprintf(jsonTable, name)
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return cr.session.Query(q).Exec()
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}
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