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// Copyright 2016 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package monitoring
import (
"time"
"github.com/prometheus/client_golang/prometheus"
"gopkg.in/httprequest.v1"
)
var (
requestDuration = prometheus.NewSummaryVec(prometheus.SummaryOpts{
Namespace: "candid",
Subsystem: "handler",
Name: "request_duration",
Help: "The duration of a web request.",
}, []string{"path_pattern"})
)
func init() {
prometheus.MustRegister(requestDuration)
}
type Request struct {
startTime time.Time
params *httprequest.Params
}
func NewRequest(p *httprequest.Params) Request {
return Request{
startTime: time.Now(),
params: p,
}
}
func (r Request) ObserveMetric() {
requestDuration.WithLabelValues(r.params.PathPattern).Observe(float64(time.Since(r.startTime)) / float64(time.Second))
}
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