04506b87d6
full diff: 4ea375f775...v0.0.1
- docker/go-metrics#15 Add functions that instruments http handler using promhttp
- docker/go-metrics#20 Rename LICENSE.code → LICENSE
- docker/go-metrics#22 Support Go Modules
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
75 lines
2.3 KiB
Go
75 lines
2.3 KiB
Go
package metrics
|
|
|
|
import (
|
|
"net/http"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
"github.com/prometheus/client_golang/prometheus/promhttp"
|
|
)
|
|
|
|
// HTTPHandlerOpts describes a set of configurable options of http metrics
|
|
type HTTPHandlerOpts struct {
|
|
DurationBuckets []float64
|
|
RequestSizeBuckets []float64
|
|
ResponseSizeBuckets []float64
|
|
}
|
|
|
|
const (
|
|
InstrumentHandlerResponseSize = iota
|
|
InstrumentHandlerRequestSize
|
|
InstrumentHandlerDuration
|
|
InstrumentHandlerCounter
|
|
InstrumentHandlerInFlight
|
|
)
|
|
|
|
type HTTPMetric struct {
|
|
prometheus.Collector
|
|
handlerType int
|
|
}
|
|
|
|
var (
|
|
defaultDurationBuckets = []float64{.005, .01, .025, .05, .1, .25, .5, 1, 2.5, 5, 10, 25, 60}
|
|
defaultRequestSizeBuckets = prometheus.ExponentialBuckets(1024, 2, 22) //1K to 4G
|
|
defaultResponseSizeBuckets = defaultRequestSizeBuckets
|
|
)
|
|
|
|
// Handler returns the global http.Handler that provides the prometheus
|
|
// metrics format on GET requests. This handler is no longer instrumented.
|
|
func Handler() http.Handler {
|
|
return promhttp.Handler()
|
|
}
|
|
|
|
func InstrumentHandler(metrics []*HTTPMetric, handler http.Handler) http.HandlerFunc {
|
|
return InstrumentHandlerFunc(metrics, handler.ServeHTTP)
|
|
}
|
|
|
|
func InstrumentHandlerFunc(metrics []*HTTPMetric, handlerFunc http.HandlerFunc) http.HandlerFunc {
|
|
var handler http.Handler
|
|
handler = http.HandlerFunc(handlerFunc)
|
|
for _, metric := range metrics {
|
|
switch metric.handlerType {
|
|
case InstrumentHandlerResponseSize:
|
|
if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
|
|
handler = promhttp.InstrumentHandlerResponseSize(collector, handler)
|
|
}
|
|
case InstrumentHandlerRequestSize:
|
|
if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
|
|
handler = promhttp.InstrumentHandlerRequestSize(collector, handler)
|
|
}
|
|
case InstrumentHandlerDuration:
|
|
if collector, ok := metric.Collector.(prometheus.ObserverVec); ok {
|
|
handler = promhttp.InstrumentHandlerDuration(collector, handler)
|
|
}
|
|
case InstrumentHandlerCounter:
|
|
if collector, ok := metric.Collector.(*prometheus.CounterVec); ok {
|
|
handler = promhttp.InstrumentHandlerCounter(collector, handler)
|
|
}
|
|
case InstrumentHandlerInFlight:
|
|
if collector, ok := metric.Collector.(prometheus.Gauge); ok {
|
|
handler = promhttp.InstrumentHandlerInFlight(collector, handler)
|
|
}
|
|
}
|
|
}
|
|
return handler.ServeHTTP
|
|
}
|