waku-org/go-waku

package dnsdisc

import (
    "github.com/libp2p/go-libp2p/p2p/metricshelper"
    "github.com/prometheus/client_golang/prometheus"
)

var dnsDiscoveredNodes = prometheus.NewCounter(
    prometheus.CounterOpts{
        Name: "waku_dnsdisc_discovered",
        Help: "The number of nodes discovered via DNS discovery",
    },
)

var dnsDiscoveryErrors = prometheus.NewCounterVec(
    prometheus.CounterOpts{
        Name: "waku_dnsdisc_errors",
        Help: "The distribution of the dns discovery protocol errors",
    },
    []string{"error_type"},
)

var collectors = []prometheus.Collector{
    dnsDiscoveredNodes,
    dnsDiscoveryErrors,
}

// Metrics exposes the functions required to update prometheus metrics for dnsdisc protocol
type Metrics interface {
    RecordDiscoveredNodes(numNodes int)
    RecordError(err metricsErrCategory)
}

type metricsImpl struct {
    reg prometheus.Registerer
}

func newMetrics(reg prometheus.Registerer) Metrics {
    metricshelper.RegisterCollectors(reg, collectors...)
    return &metricsImpl{
        reg: reg,
    }
}

type metricsErrCategory string

var (
    treeSyncFailure metricsErrCategory = "tree_sync_failure"
    peerInfoFailure metricsErrCategory = "peer_info_failure"
)

// RecordError increases the counter for different error types
func (m *metricsImpl) RecordError(err metricsErrCategory) {
    dnsDiscoveryErrors.WithLabelValues(string(err)).Inc()
}

func (m *metricsImpl) RecordDiscoveredNodes(numNodes int) {
    dnsDiscoveredNodes.Add(float64(numNodes))
}