75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
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package metrics
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import (
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"net/http"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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// HTTPHandlerOpts describes a set of configurable options of http metrics
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type HTTPHandlerOpts struct {
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DurationBuckets []float64
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RequestSizeBuckets []float64
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ResponseSizeBuckets []float64
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}
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const (
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InstrumentHandlerResponseSize = iota
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InstrumentHandlerRequestSize
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InstrumentHandlerDuration
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InstrumentHandlerCounter
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InstrumentHandlerInFlight
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)
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type HTTPMetric struct {
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prometheus.Collector
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handlerType int
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}
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var (
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defaultDurationBuckets = []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 25, 60}
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defaultRequestSizeBuckets = prometheus.ExponentialBuckets(1024, 2, 22) //1K to 4G
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defaultResponseSizeBuckets = defaultRequestSizeBuckets
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)
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// Handler returns the global http.Handler that provides the prometheus
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// metrics format on GET requests. This handler is no longer instrumented.
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func Handler() http.Handler {
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return promhttp.Handler()
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}
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func InstrumentHandler(metrics []*HTTPMetric, handler http.Handler) http.HandlerFunc {
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return InstrumentHandlerFunc(metrics, handler.ServeHTTP)
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}
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func InstrumentHandlerFunc(metrics []*HTTPMetric, handlerFunc http.HandlerFunc) http.HandlerFunc {
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var handler http.Handler
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handler = http.HandlerFunc(handlerFunc)
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for _, metric := range metrics {
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switch metric.handlerType {
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case InstrumentHandlerResponseSize:
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if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
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handler = promhttp.InstrumentHandlerResponseSize(collector, handler)
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}
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case InstrumentHandlerRequestSize:
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if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
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handler = promhttp.InstrumentHandlerRequestSize(collector, handler)
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}
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case InstrumentHandlerDuration:
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if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
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handler = promhttp.InstrumentHandlerDuration(collector, handler)
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}
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case InstrumentHandlerCounter:
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if collector, ok := metric.Collector.(*prometheus.CounterVec); ok {
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handler = promhttp.InstrumentHandlerCounter(collector, handler)
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}
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case InstrumentHandlerInFlight:
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if collector, ok := metric.Collector.(prometheus.Gauge); ok {
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handler = promhttp.InstrumentHandlerInFlight(collector, handler)
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}
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}
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}
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return handler.ServeHTTP
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}
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