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package metrics
import (
"fmt"
"go.uber.org/zap"
"github.com/eclipse/paho.mqtt.golang"
"github.com/hikhvar/mqtt2prometheus/pkg/config"
)
type Ingest struct {
instrumentation
extractor Extractor
deviceIDRegex *config.Regexp
collector Collector
logger *zap.Logger
}
func NewIngest(collector Collector, extractor Extractor, deviceIDRegex *config.Regexp) *Ingest {
return &Ingest{
instrumentation: defaultInstrumentation,
extractor: extractor,
deviceIDRegex: deviceIDRegex,
collector: collector,
logger: config.ProcessContext.Logger(),
}
}
func (i *Ingest) store(topic string, payload []byte) error {
deviceID := i.deviceID(topic)
mc, err := i.extractor(topic, payload, deviceID)
if err != nil {
return fmt.Errorf("failed to extract metric values from topic: %w", err)
}
i.collector.Observe(deviceID, mc)
return nil
}
func (i *Ingest) SetupSubscriptionHandler(errChan chan<- error) mqtt.MessageHandler {
return func(c mqtt.Client, m mqtt.Message) {
i.logger.Debug("Got message", zap.String("topic", m.Topic()), zap.String("payload", string(m.Payload())))
err := i.store(m.Topic(), m.Payload())
if err != nil {
errChan <- fmt.Errorf("could not store metrics '%s' on topic %s: %s", string(m.Payload()), m.Topic(), err.Error())
i.CountStoreError(m.Topic())
return
}
i.CountSuccess(m.Topic())
}
}
// deviceID uses the configured DeviceIDRegex to extract the device ID from the given mqtt topic path.
func (i *Ingest) deviceID(topic string) string {
return i.deviceIDRegex.GroupValue(topic, config.DeviceIDRegexGroup)
}
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