/
mqtt.go
73 lines (58 loc) · 2.15 KB
/
mqtt.go
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package relay
import (
"context"
"fmt"
"time"
"google.golang.org/grpc"
"github.com/batchcorp/collector-schemas/build/go/protos/records"
"github.com/batchcorp/collector-schemas/build/go/protos/services"
"github.com/batchcorp/plumber/backends/mqtt/types"
)
// handleMQTT sends a MQTT relay message to the GRPC server
func (r *Relay) handleMQTT(ctx context.Context, conn *grpc.ClientConn, messages []interface{}) error {
sinkRecords, err := r.convertMessagesToMQTTRecords(messages)
if err != nil {
return fmt.Errorf("unable to convert messages to mqtt sink records: %s", err)
}
client := services.NewGRPCCollectorClient(conn)
return r.CallWithRetry(ctx, "AddMQTTRecord", func(ctx context.Context) error {
_, err := client.AddMQTTRecord(ctx, &services.MQTTRecordRequest{
Records: sinkRecords,
}, grpc.MaxCallSendMsgSize(MaxGRPCMessageSize))
return err
})
}
// validateMQTTMessage ensures all necessary values are present for a MQTT relay message
func (r *Relay) validateMQTTMessage(msg *types.RelayMessage) error {
if msg == nil {
return ErrMissingMessage
}
if msg.Value == nil {
return ErrMissingMessageValue
}
return nil
}
// convertMessagesToMQTTRecords creates a records.MQTTRecord from a MQTT.Message which can then
// be sent to the GRPC server
func (r *Relay) convertMessagesToMQTTRecords(messages []interface{}) ([]*records.MQTTRecord, error) {
sinkRecords := make([]*records.MQTTRecord, 0)
for i, v := range messages {
relayMessage, ok := v.(*types.RelayMessage)
if !ok {
return nil, fmt.Errorf("unable to type assert incoming message as RelayMessage (index: %d)", i)
}
if err := r.validateMQTTMessage(relayMessage); err != nil {
return nil, fmt.Errorf("unable to validate MQTT relay message (index: %d): %s", i, err)
}
sinkRecords = append(sinkRecords, &records.MQTTRecord{
Id: uint32(relayMessage.Value.MessageID()),
Topic: relayMessage.Value.Topic(),
Duplicate: relayMessage.Value.Duplicate(),
Retained: relayMessage.Value.Retained(),
Qos: uint32(relayMessage.Value.Qos()),
Value: relayMessage.Value.Payload(),
Timestamp: time.Now().UTC().UnixNano(),
})
}
return sinkRecords, nil
}