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Merge pull request #62 from tgeoghegan/prometheus
Add Prometheus metric scrapes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,2 @@ | ||
| *.pem | ||
| app-gateway-go |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| // Copyright (c) 2024 Cloudflare, Inc. All rights reserved. | ||
| // SPDX-License-Identifier: BSD-3-Clause | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| "net/http" | ||
| "time" | ||
|
|
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| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| ) | ||
|
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| type PrometheusConfig struct { | ||
| Host string | ||
| Port string | ||
| ScrapePath string | ||
| MetricName string | ||
| } | ||
|
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| type PrometheusMetrics struct { | ||
| startedAt time.Time | ||
| histogram prometheus.ObserverVec | ||
| } | ||
|
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| func (p *PrometheusMetrics) Fire(result string) { | ||
| observer := p.histogram.With(prometheus.Labels{ | ||
| "method": "unknown", | ||
| "status": "unknown", | ||
| "result": result, | ||
| }) | ||
| p.observe(observer) | ||
| } | ||
|
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| func (p *PrometheusMetrics) ResponseStatus(method string, status int) { | ||
| observer := p.histogram.With(prometheus.Labels{ | ||
| "method": method, | ||
| "status": fmt.Sprint(status), | ||
| "result": "unknown", | ||
| }) | ||
| p.observe(observer) | ||
| } | ||
|
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| func (p *PrometheusMetrics) observe(observer prometheus.Observer) { | ||
| elapsed := time.Now().Sub(p.startedAt) | ||
| observer.Observe(float64(elapsed.Milliseconds())) | ||
| } | ||
|
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| type PrometheusMetricsFactory struct { | ||
| metricName string | ||
| } | ||
|
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| func NewPrometheusMetricsFactory(config PrometheusConfig) (MetricsFactory, error) { | ||
| serveMux := http.NewServeMux() | ||
| serveMux.Handle(config.ScrapePath, promhttp.Handler()) | ||
| server := http.Server{ | ||
| Addr: net.JoinHostPort(config.Host, config.Port), | ||
| Handler: serveMux, | ||
| } | ||
|
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| go func() { | ||
| log.Printf("Listening for Prometheus scrapes on %s:%s\n", config.Host, config.Port) | ||
| log.Fatal(server.ListenAndServe()) | ||
| }() | ||
|
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| return &PrometheusMetricsFactory{metricName: config.MetricName}, nil | ||
| } | ||
|
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| func (p PrometheusMetricsFactory) Create(eventName string) Metrics { | ||
| histogram := prometheus.NewHistogramVec(prometheus.HistogramOpts{ | ||
| Name: p.metricName, | ||
| }, []string{"eventName", "status", "method", "result"}) | ||
|
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| if err := prometheus.Register(histogram); err != nil { | ||
| are := &prometheus.AlreadyRegisteredError{} | ||
| if errors.As(err, are) { | ||
| // Use previously registered metric collector | ||
| histogram = are.ExistingCollector.(*prometheus.HistogramVec) | ||
| } else { | ||
| // There's no other reason prometheus.Register should fail and the interface won't let | ||
| // us return an error. | ||
| panic(err) | ||
| } | ||
| } | ||
|
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| return &PrometheusMetrics{ | ||
| startedAt: time.Now(), | ||
| histogram: histogram.MustCurryWith(prometheus.Labels{"eventName": eventName}), | ||
| } | ||
| } |
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