mirror of
https://github.com/hikhvar/mqtt2prometheus.git
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be4af9ff5e
This commit allows to extract the metric name from the topic path. Now it can be configured if all metrics are in a object in a certain topic or if every topic contains exactly one metric. However, currently these modes can not be mixed. This should solve !26 TODO: * Update documentation * Add unit tests
57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
package metrics
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import (
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"fmt"
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"go.uber.org/zap"
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"github.com/eclipse/paho.mqtt.golang"
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"github.com/hikhvar/mqtt2prometheus/pkg/config"
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)
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type Ingest struct {
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instrumentation
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extractor Extractor
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deviceIDRegex *config.Regexp
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collector Collector
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logger *zap.Logger
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}
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func NewIngest(collector Collector, extractor Extractor, deviceIDRegex *config.Regexp) *Ingest {
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return &Ingest{
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instrumentation: defaultInstrumentation,
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extractor: extractor,
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deviceIDRegex: deviceIDRegex,
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collector: collector,
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logger: config.ProcessContext.Logger(),
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}
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}
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func (i *Ingest) store(topic string, payload []byte) error {
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deviceID := i.deviceID(topic)
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mc, err := i.extractor(topic, payload, deviceID)
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if err != nil {
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return fmt.Errorf("failed to extract metric values from topic: %w", err)
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}
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i.collector.Observe(deviceID, mc)
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return nil
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}
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func (i *Ingest) SetupSubscriptionHandler(errChan chan<- error) mqtt.MessageHandler {
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return func(c mqtt.Client, m mqtt.Message) {
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i.logger.Debug("Got message", zap.String("topic", m.Topic()), zap.String("payload", string(m.Payload())))
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err := i.store(m.Topic(), m.Payload())
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if err != nil {
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errChan <- fmt.Errorf("could not store metrics '%s' on topic %s: %s", string(m.Payload()), m.Topic(), err.Error())
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i.CountStoreError(m.Topic())
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return
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}
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i.CountSuccess(m.Topic())
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}
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}
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// deviceID uses the configured DeviceIDRegex to extract the device ID from the given mqtt topic path.
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func (i *Ingest) deviceID(topic string) string {
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return i.deviceIDRegex.GroupValue(topic, config.DeviceIDRegexGroup)
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}
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