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Merge pull request #3 from afittere/master
Metrics
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| kind-kubeconfig | ||
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| tilt-settings.json | ||
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| .idea/ | ||
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,53 @@ | ||
| package metrics | ||
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| import ( | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
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| "github.com/go-logr/logr" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| ) | ||
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| var ( | ||
| Log logr.Logger | ||
| ) | ||
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| // RegistererGatherer combines both parts of the API of a Prometheus | ||
| // registry, both the Registerer and the Gatherer interfaces. | ||
| type RegistererGatherer interface { | ||
| prometheus.Registerer | ||
| prometheus.Gatherer | ||
| } | ||
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| // Registry is a prometheus registry for storing metrics | ||
| var Registry RegistererGatherer = prometheus.NewRegistry() | ||
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| func ServeMetrics() { | ||
| var metricsPath = "/metrics" | ||
| var addr = ":8080" | ||
| handler := promhttp.HandlerFor(Registry, promhttp.HandlerOpts{ | ||
| ErrorHandling: promhttp.HTTPErrorOnError, | ||
| }) | ||
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| mux := http.NewServeMux() | ||
| mux.Handle(metricsPath, handler) | ||
| mux.Handle("/", http.HandlerFunc(func(rw http.ResponseWriter, _ *http.Request) { | ||
| rw.WriteHeader(http.StatusOK) | ||
| })) | ||
| server := http.Server{ | ||
| Handler: mux, | ||
| } | ||
| ln, err := net.Listen("tcp", addr) | ||
| if err != nil { | ||
| er := fmt.Errorf("error listening on %s: %w", addr, err) | ||
| Log.Error(er, "metrics server failed to listen. You may want to disable the metrics server or use another port if it is due to conflicts") | ||
| return | ||
| } | ||
| // Run the server | ||
| Log.Info("starting metrics server", "path", metricsPath) | ||
| if err := server.Serve(ln); err != nil && err != http.ErrServerClosed { | ||
| Log.Error(err, "server shutdown") | ||
| } | ||
| } |