vendor/golang.org/x/net/trace/events.go

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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package trace

import (
	"bytes"
	"fmt"
	"html/template"
	"io"
	"log"
	"net/http"
	"runtime"
	"sort"
	"strconv"
	"strings"
	"sync"
	"sync/atomic"
	"text/tabwriter"
	"time"
)

const maxEventsPerLog = 100

type bucket struct {
	MaxErrAge time.Duration
	String    string
}

var buckets = []bucket{
	{0, "total"},
	{10 * time.Second, "errs<10s"},
	{1 * time.Minute, "errs<1m"},
	{10 * time.Minute, "errs<10m"},
	{1 * time.Hour, "errs<1h"},
	{10 * time.Hour, "errs<10h"},
	{24000 * time.Hour, "errors"},
}

// RenderEvents renders the HTML page typically served at /debug/events.
// It does not do any auth checking. The request may be nil.
//
// Most users will use the Events handler.
func RenderEvents(w http.ResponseWriter, req *http.Request, sensitive bool) {
	now := time.Now()
	data := &struct {
		Families []string // family names
		Buckets  []bucket
		Counts   [][]int // eventLog count per family/bucket

		// Set when a bucket has been selected.
		Family    string
		Bucket    int
		EventLogs eventLogs
		Expanded  bool
	}{
		Buckets: buckets,
	}