From d0ff1b2d04fc0caf57d99f1d34ce13cf4aae6a1a Mon Sep 17 00:00:00 2001 From: Christine Dodrill Date: Wed, 27 Mar 2019 07:18:52 -0700 Subject: reorg: phase 1 --- internal/middleware/metrics.go | 43 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) create mode 100644 internal/middleware/metrics.go (limited to 'internal/middleware/metrics.go') diff --git a/internal/middleware/metrics.go b/internal/middleware/metrics.go new file mode 100644 index 0000000..df4816d --- /dev/null +++ b/internal/middleware/metrics.go @@ -0,0 +1,43 @@ +package middleware + +import ( + "net/http" + + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promhttp" +) + +var ( + requestCounter = prometheus.NewCounterVec( + prometheus.CounterOpts{ + Name: "handler_requests_total", + Help: "Total number of request/responses by HTTP status code.", + }, []string{"handler", "code"}) + + requestDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{ + Name: "handler_request_duration", + Help: "Handler request duration.", + }, []string{"handler", "method"}) + + requestInFlight = prometheus.NewGaugeVec(prometheus.GaugeOpts{ + Name: "handler_requests_in_flight", + Help: "Current number of requests being served.", + }, []string{"handler"}) +) + +func init() { + prometheus.Register(requestCounter) + prometheus.Register(requestDuration) + prometheus.Register(requestInFlight) +} + +// Metrics captures request duration, request count and in-flight request count +// metrics for HTTP handlers. The family field is used to discriminate handlers. +func Metrics(family string, next http.Handler) http.Handler { + return promhttp.InstrumentHandlerDuration( + requestDuration.MustCurryWith(prometheus.Labels{"handler": family}), + promhttp.InstrumentHandlerCounter(requestCounter.MustCurryWith(prometheus.Labels{"handler": family}), + promhttp.InstrumentHandlerInFlight(requestInFlight.With(prometheus.Labels{"handler": family}), next), + ), + ) +} -- cgit v1.2.3 From bce017f56f2413872a3a904067d6d19d173a9904 Mon Sep 17 00:00:00 2001 From: Christine Dodrill Date: Wed, 27 Mar 2019 07:40:42 -0700 Subject: shadow errors --- internal/middleware/metrics.go | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'internal/middleware/metrics.go') diff --git a/internal/middleware/metrics.go b/internal/middleware/metrics.go index df4816d..f9d7e0f 100644 --- a/internal/middleware/metrics.go +++ b/internal/middleware/metrics.go @@ -26,9 +26,9 @@ var ( ) func init() { - prometheus.Register(requestCounter) - prometheus.Register(requestDuration) - prometheus.Register(requestInFlight) + _ = prometheus.Register(requestCounter) + _ = prometheus.Register(requestDuration) + _ = prometheus.Register(requestInFlight) } // Metrics captures request duration, request count and in-flight request count -- cgit v1.2.3