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package metrics
import (
"fmt"
"github.com/hikhvar/mqtt2prometheus/pkg/config"
gojsonq "github.com/thedevsaddam/gojsonq/v2"
)
type Extractor func(topic string, payload []byte, deviceID string) (MetricCollection, error)
func NewJSONObjectExtractor(p Parser) Extractor {
return func(topic string, payload []byte, deviceID string) (MetricCollection, error) {
var mc MetricCollection
parsed := gojsonq.New(gojsonq.SetSeparator(p.separator)).FromString(string(payload))
for path := range p.config() {
rawValue := parsed.Find(path)
parsed.Reset()
if rawValue == nil {
continue
}
// Find a valid metrics config
config, found := p.findMetricConfig(path, deviceID)
if !found {
continue
}
m, err := p.parseMetric(config, rawValue)
if err != nil {
return nil, fmt.Errorf("failed to parse valid metric value: %w", err)
}
m.Topic = topic
mc = append(mc, m)
}
return mc, nil
}
}
func NewMetricPerTopicExtractor(p Parser, metricNameRegex *config.Regexp) Extractor {
return func(topic string, payload []byte, deviceID string) (MetricCollection, error) {
metricName := metricNameRegex.GroupValue(topic, config.MetricNameRegexGroup)
if metricName == "" {
return nil, fmt.Errorf("failed to find valid metric in topic path")
}
// Find a valid metrics config
config, found := p.findMetricConfig(metricName, deviceID)
if !found {
return nil, nil
}
m, err := p.parseMetric(config, string(payload))
if err != nil {
return nil, fmt.Errorf("failed to parse metric: %w", err)
}
m.Topic = topic
return MetricCollection{m}, nil
}
}
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