91 lines
3.4 KiB
Go
91 lines
3.4 KiB
Go
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// Package metrics exposes lightweight Prometheus text-format metrics without
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// pulling in a metrics dependency. Counters are plain atomics; gauges are
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// callback functions so they always report current values.
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package metrics
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import (
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"fmt"
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"net/http"
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"runtime"
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"sync/atomic"
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)
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type gauge struct {
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name string
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help string
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extra string
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fn func() float64
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}
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type Metrics struct {
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CTCertificates atomic.Uint64
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CTIdentifiers atomic.Uint64
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DirectMatches atomic.Uint64
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CNAMEMatches atomic.Uint64
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DNSQueries atomic.Uint64
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DNSCacheHits atomic.Uint64
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DNSErrors atomic.Uint64
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Candidates atomic.Uint64
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DBRows atomic.Uint64
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DBErrors atomic.Uint64
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QueueDrops atomic.Uint64
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QueueFull atomic.Uint64
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MalformedCT atomic.Uint64
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CTErrors atomic.Uint64
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ProbeAttempts atomic.Uint64
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ProbePublic atomic.Uint64
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gauges []gauge
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}
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func New() *Metrics {
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m := &Metrics{}
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m.gauges = []gauge{
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{"go_goroutines", "Number of goroutines", "", func() float64 { return float64(runtime.NumGoroutine()) }},
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{"process_system_bytes", "Bytes of memory obtained from the OS", "", func() float64 {
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var ms runtime.MemStats
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runtime.ReadMemStats(&ms)
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return float64(ms.Sys)
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}},
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}
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return m
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}
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// SetQueueDepth registers a gauge reporting the live depth of a named queue.
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func (m *Metrics) SetQueueDepth(name string, fn func() float64) {
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m.gauges = append(m.gauges, gauge{"queue_depth", "Current depth of an internal queue", `{queue="` + name + `"}`, fn})
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}
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// Handler returns an http.Handler serving the Prometheus text exposition format.
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func (m *Metrics) Handler() http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("Content-Type", "text/plain; version=0.0.4; charset=utf-8")
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counter := func(name, help string, v uint64) {
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fmt.Fprintf(w, "# HELP %s %s\n# TYPE %s counter\n%s %d\n", name, help, name, name, v)
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}
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counter("ct_certificates_total", "Certificates processed from CT logs", m.CTCertificates.Load())
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counter("ct_identifiers_total", "DNS identifiers parsed from CT certificates", m.CTIdentifiers.Load())
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counter("classifier_direct_matches_total", "Identifiers matching a provider directly", m.DirectMatches.Load())
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counter("classifier_cname_matches_total", "CNAME targets matching a provider", m.CNAMEMatches.Load())
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counter("dns_queries_total", "DNS queries performed", m.DNSQueries.Load())
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counter("dns_cache_hits_total", "DNS lookups served from cache", m.DNSCacheHits.Load())
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counter("dns_errors_total", "DNS lookup errors", m.DNSErrors.Load())
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counter("candidates_total", "Provider candidates produced", m.Candidates.Load())
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counter("db_rows_total", "Rows written to PostgreSQL", m.DBRows.Load())
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counter("db_errors_total", "PostgreSQL write errors", m.DBErrors.Load())
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counter("queue_drops_total", "Items dropped because a queue was full", m.QueueDrops.Load())
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counter("queue_full_total", "Times a queue was observed full", m.QueueFull.Load())
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counter("ct_malformed_entries_total", "Malformed CT log entries", m.MalformedCT.Load())
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counter("ct_errors_total", "Non-fatal CT errors", m.CTErrors.Load())
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counter("probe_attempts_total", "Optional reachability probes performed", m.ProbeAttempts.Load())
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counter("probe_public_total", "Probes classified as public read", m.ProbePublic.Load())
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for _, g := range m.gauges {
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fmt.Fprintf(w, "# HELP %s %s\n# TYPE %s gauge\n%s%s %g\n", g.name, g.help, g.name, g.name, g.extra, g.fn())
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}
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})
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}
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