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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -17,4 +17,6 @@ dcp: | |
| memberNumber: 1 | ||
| totalMembers: 1 | ||
| api: | ||
| port: 8080 | ||
| port: 8080 | ||
| metric: | ||
| path: /metrics | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,124 @@ | ||
| package godcpclient | ||
|
|
||
| import ( | ||
| "github.com/ansrivas/fiberprometheus/v2" | ||
| "github.com/gofiber/fiber/v2" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "log" | ||
| "strconv" | ||
| ) | ||
|
|
||
| type MetricCollector struct { | ||
| observer Observer | ||
|
|
||
| mutation *prometheus.Desc | ||
| deletion *prometheus.Desc | ||
| expiration *prometheus.Desc | ||
|
|
||
| currentSeqNo *prometheus.Desc | ||
| startSeqNo *prometheus.Desc | ||
| endSeqNo *prometheus.Desc | ||
| } | ||
|
|
||
| func (s *MetricCollector) Describe(ch chan<- *prometheus.Desc) { | ||
| prometheus.DescribeByCollect(s, ch) | ||
| } | ||
|
|
||
| func (s *MetricCollector) Collect(ch chan<- prometheus.Metric) { | ||
| metric := s.observer.GetMetric() | ||
|
|
||
| ch <- prometheus.MustNewConstMetric( | ||
| s.mutation, | ||
| prometheus.CounterValue, | ||
| metric.TotalMutations, | ||
| ) | ||
|
|
||
| ch <- prometheus.MustNewConstMetric( | ||
| s.deletion, | ||
| prometheus.CounterValue, | ||
| metric.TotalDeletions, | ||
| ) | ||
|
|
||
| ch <- prometheus.MustNewConstMetric( | ||
| s.expiration, | ||
| prometheus.CounterValue, | ||
| metric.TotalExpirations, | ||
| ) | ||
|
|
||
| for vbId, state := range s.observer.GetState() { | ||
| ch <- prometheus.MustNewConstMetric( | ||
| s.currentSeqNo, | ||
| prometheus.CounterValue, | ||
| float64(state.SeqNo), | ||
| strconv.Itoa(int(vbId)), | ||
| ) | ||
|
|
||
| ch <- prometheus.MustNewConstMetric( | ||
| s.startSeqNo, | ||
| prometheus.CounterValue, | ||
| float64(state.StartSeqNo), | ||
| strconv.Itoa(int(vbId)), | ||
| ) | ||
|
|
||
| ch <- prometheus.MustNewConstMetric( | ||
| s.endSeqNo, | ||
| prometheus.CounterValue, | ||
| float64(state.EndSeqNo), | ||
| strconv.Itoa(int(vbId)), | ||
| ) | ||
| } | ||
| } | ||
|
|
||
| func NewMetricMiddleware(app *fiber.App, config Config, observer Observer) func(ctx *fiber.Ctx) error { | ||
| err := prometheus.DefaultRegisterer.Register(&MetricCollector{ | ||
| observer: observer, | ||
|
|
||
| mutation: prometheus.NewDesc( | ||
| prometheus.BuildFQName(Name, "mutation", "total"), | ||
| "Mutation count", | ||
| nil, | ||
| nil, | ||
| ), | ||
| deletion: prometheus.NewDesc( | ||
| prometheus.BuildFQName(Name, "deletion", "total"), | ||
| "Deletion count", | ||
| nil, | ||
| nil, | ||
| ), | ||
| expiration: prometheus.NewDesc( | ||
| prometheus.BuildFQName(Name, "expiration", "total"), | ||
| "Expiration count", | ||
| nil, | ||
| nil, | ||
| ), | ||
| currentSeqNo: prometheus.NewDesc( | ||
| prometheus.BuildFQName(Name, "seq_no", "current"), | ||
| "Current seq no", | ||
| []string{"vbId"}, | ||
| nil, | ||
| ), | ||
| startSeqNo: prometheus.NewDesc( | ||
| prometheus.BuildFQName(Name, "start_seq_no", "current"), | ||
| "Start seq no", | ||
| []string{"vbId"}, | ||
| nil, | ||
| ), | ||
| endSeqNo: prometheus.NewDesc( | ||
| prometheus.BuildFQName(Name, "end_seq_no", "current"), | ||
| "End seq no", | ||
| []string{"vbId"}, | ||
| nil, | ||
| ), | ||
| }) | ||
|
|
||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| fiberPrometheus := fiberprometheus.New(config.UserAgent) | ||
| fiberPrometheus.RegisterAt(app, config.Metric.Path) | ||
|
|
||
| log.Printf("Metric middleware registered on path %s", config.Metric.Path) | ||
|
|
||
| return fiberPrometheus.Middleware | ||
| } |
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