YTSFlix_Go/vendor/github.com/anacrolix/missinggo/perf/events.go

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2018-11-04 14:58:15 +00:00
package perf
import (
"fmt"
"io"
"net/http"
"sort"
"sync"
"text/tabwriter"
)
var (
mu sync.RWMutex
events = map[string]*Event{}
)
func init() {
http.HandleFunc("/debug/perf", func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=UTF-8")
WriteEventsTable(w)
})
}
func WriteEventsTable(w io.Writer) {
tw := tabwriter.NewWriter(w, 0, 0, 2, ' ', 0)
fmt.Fprint(tw, "description\ttotal\tcount\tmin\tmean\tmax\n")
type t struct {
d string
e Event
}
mu.RLock()
es := make([]t, 0, len(events))
for d, e := range events {
e.Mu.RLock()
es = append(es, t{d, *e})
e.Mu.RUnlock()
}
mu.RUnlock()
sort.Slice(es, func(i, j int) bool {
return es[i].e.Total > es[j].e.Total
})
for _, el := range es {
e := el.e
fmt.Fprintf(tw, "%s\t%v\t%v\t%v\t%v\t%v\n", el.d, e.Total, e.Count, e.Min, e.MeanTime(), e.Max)
}
tw.Flush()
}