init

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

@@ -0,0 +1,47 @@
+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()
+}