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prometheus_collector.go
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prometheus_collector.go
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package server
import (
"context"
"github.com/bitmagnet-io/bitmagnet/internal/protocol/dht"
"github.com/prometheus/client_golang/prometheus"
"net/netip"
"time"
)
type prometheusCollector struct {
queryDuration *prometheus.HistogramVec
querySuccessTotal *prometheus.CounterVec
queryErrorTotal *prometheus.CounterVec
queryConcurrency *prometheus.GaugeVec
}
const labelQuery = "query"
var labelNames = []string{labelQuery}
func newPrometheusCollector() prometheusCollector {
return prometheusCollector{
queryDuration: prometheus.NewHistogramVec(prometheus.HistogramOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "query_duration_seconds",
Help: "A histogram of successful DHT query durations in seconds.",
Buckets: prometheus.ExponentialBuckets(0.1, 1.5, 5),
}, labelNames),
querySuccessTotal: prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "query_success_total",
Help: "A counter of successful DHT queries.",
}, labelNames),
queryErrorTotal: prometheus.NewCounterVec(prometheus.CounterOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "query_error_total",
Help: "A counter of failed DHT queries.",
}, labelNames),
queryConcurrency: prometheus.NewGaugeVec(prometheus.GaugeOpts{
Namespace: namespace,
Subsystem: subsystem,
Name: "query_concurrency",
Help: "Number of concurrent DHT queries.",
}, labelNames),
}
}
type prometheusServerWrapper struct {
prometheusCollector
server Server
}
func (s prometheusServerWrapper) start() error {
return s.server.start()
}
func (s prometheusServerWrapper) stop() {
s.server.stop()
}
func (s prometheusServerWrapper) Query(ctx context.Context, addr netip.AddrPort, q string, args dht.MsgArgs) (dht.RecvMsg, error) {
labels := prometheus.Labels{labelQuery: q}
s.queryConcurrency.With(labels).Inc()
start := time.Now()
res, err := s.server.Query(ctx, addr, q, args)
s.queryConcurrency.With(labels).Dec()
if err == nil {
s.queryDuration.With(labels).Observe(time.Since(start).Seconds())
s.querySuccessTotal.With(labels).Inc()
} else {
s.queryErrorTotal.With(labels).Inc()
}
return res, err
}