/
collector.go
75 lines (61 loc) · 2.02 KB
/
collector.go
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package kafka
import (
"github.com/ansrivas/fiberprometheus/v2"
"github.com/gofiber/fiber/v2"
"github.com/prometheus/client_golang/prometheus"
)
const Name = "kafka_konsumer"
type MetricCollector struct {
consumerMetric *ConsumerMetric
totalUnprocessedMessagesCounter *prometheus.Desc
totalProcessedMessagesCounter *prometheus.Desc
}
func NewMetricCollector(metricPrefix string, consumerMetric *ConsumerMetric) *MetricCollector {
if metricPrefix == "" {
metricPrefix = Name
}
return &MetricCollector{
consumerMetric: consumerMetric,
totalProcessedMessagesCounter: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "processed_messages_total", "current"),
"Total number of processed messages.",
emptyStringList,
nil,
),
totalUnprocessedMessagesCounter: prometheus.NewDesc(
prometheus.BuildFQName(metricPrefix, "unprocessed_messages_total", "current"),
"Total number of unprocessed messages.",
emptyStringList,
nil,
),
}
}
func (s *MetricCollector) Describe(ch chan<- *prometheus.Desc) {
prometheus.DescribeByCollect(s, ch)
}
var emptyStringList []string
func (s *MetricCollector) Collect(ch chan<- prometheus.Metric) {
ch <- prometheus.MustNewConstMetric(
s.totalProcessedMessagesCounter,
prometheus.CounterValue,
float64(s.consumerMetric.TotalProcessedMessagesCounter),
emptyStringList...,
)
ch <- prometheus.MustNewConstMetric(
s.totalUnprocessedMessagesCounter,
prometheus.CounterValue,
float64(s.consumerMetric.TotalUnprocessedMessagesCounter),
emptyStringList...,
)
}
func NewMetricMiddleware(cfg *ConsumerConfig,
app *fiber.App,
consumerMetric *ConsumerMetric,
metricCollectors ...prometheus.Collector,
) (func(ctx *fiber.Ctx) error, error) {
prometheus.DefaultRegisterer.MustRegister(NewMetricCollector(cfg.MetricPrefix, consumerMetric))
prometheus.DefaultRegisterer.MustRegister(metricCollectors...)
fiberPrometheus := fiberprometheus.New(cfg.Reader.GroupID)
fiberPrometheus.RegisterAt(app, *cfg.MetricConfiguration.Path)
return fiberPrometheus.Middleware, nil
}