Go mod tidy

3 files changed, 0 insertions, 2027 deletions

diff --git a/vendor/golang.org/x/net/trace/events.go b/vendor/golang.org/x/net/trace/events.go
deleted file mode 100644
index c646a69..0000000
--- a/vendor/golang.org/x/net/trace/events.go
+++ /dev/null
@@ -1,532 +0,0 @@
-// 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,
-	}
-
-	data.Families = make([]string, 0, len(families))
-	famMu.RLock()
-	for name := range families {
-		data.Families = append(data.Families, name)
-	}
-	famMu.RUnlock()
-	sort.Strings(data.Families)
-
-	// Count the number of eventLogs in each family for each error age.
-	data.Counts = make([][]int, len(data.Families))
-	for i, name := range data.Families {
-		// TODO(sameer): move this loop under the family lock.
-		f := getEventFamily(name)
-		data.Counts[i] = make([]int, len(data.Buckets))
-		for j, b := range data.Buckets {
-			data.Counts[i][j] = f.Count(now, b.MaxErrAge)
-		}
-	}
-
-	if req != nil {
-		var ok bool
-		data.Family, data.Bucket, ok = parseEventsArgs(req)
-		if !ok {
-			// No-op
-		} else {
-			data.EventLogs = getEventFamily(data.Family).Copy(now, buckets[data.Bucket].MaxErrAge)
-		}
-		if data.EventLogs != nil {
-			defer data.EventLogs.Free()
-			sort.Sort(data.EventLogs)
-		}
-		if exp, err := strconv.ParseBool(req.FormValue("exp")); err == nil {
-			data.Expanded = exp
-		}
-	}
-
-	famMu.RLock()
-	defer famMu.RUnlock()
-	if err := eventsTmpl().Execute(w, data); err != nil {
-		log.Printf("net/trace: Failed executing template: %v", err)
-	}
-}
-
-func parseEventsArgs(req *http.Request) (fam string, b int, ok bool) {
-	fam, bStr := req.FormValue("fam"), req.FormValue("b")
-	if fam == "" || bStr == "" {
-		return "", 0, false
-	}
-	b, err := strconv.Atoi(bStr)
-	if err != nil || b < 0 || b >= len(buckets) {
-		return "", 0, false
-	}
-	return fam, b, true
-}
-
-// An EventLog provides a log of events associated with a specific object.
-type EventLog interface {
-	// Printf formats its arguments with fmt.Sprintf and adds the
-	// result to the event log.
-	Printf(format string, a ...interface{})
-
-	// Errorf is like Printf, but it marks this event as an error.
-	Errorf(format string, a ...interface{})
-
-	// Finish declares that this event log is complete.
-	// The event log should not be used after calling this method.
-	Finish()
-}
-
-// NewEventLog returns a new EventLog with the specified family name
-// and title.
-func NewEventLog(family, title string) EventLog {
-	el := newEventLog()
-	el.ref()
-	el.Family, el.Title = family, title
-	el.Start = time.Now()
-	el.events = make([]logEntry, 0, maxEventsPerLog)
-	el.stack = make([]uintptr, 32)
-	n := runtime.Callers(2, el.stack)
-	el.stack = el.stack[:n]
-
-	getEventFamily(family).add(el)
-	return el
-}
-
-func (el *eventLog) Finish() {
-	getEventFamily(el.Family).remove(el)
-	el.unref() // matches ref in New
-}
-
-var (
-	famMu    sync.RWMutex
-	families = make(map[string]*eventFamily) // family name => family
-)
-
-func getEventFamily(fam string) *eventFamily {
-	famMu.Lock()
-	defer famMu.Unlock()
-	f := families[fam]
-	if f == nil {
-		f = &eventFamily{}
-		families[fam] = f
-	}
-	return f
-}
-
-type eventFamily struct {
-	mu        sync.RWMutex
-	eventLogs eventLogs
-}
-
-func (f *eventFamily) add(el *eventLog) {
-	f.mu.Lock()
-	f.eventLogs = append(f.eventLogs, el)
-	f.mu.Unlock()
-}
-
-func (f *eventFamily) remove(el *eventLog) {
-	f.mu.Lock()
-	defer f.mu.Unlock()
-	for i, el0 := range f.eventLogs {
-		if el == el0 {
-			copy(f.eventLogs[i:], f.eventLogs[i+1:])
-			f.eventLogs = f.eventLogs[:len(f.eventLogs)-1]
-			return
-		}
-	}
-}
-
-func (f *eventFamily) Count(now time.Time, maxErrAge time.Duration) (n int) {
-	f.mu.RLock()
-	defer f.mu.RUnlock()
-	for _, el := range f.eventLogs {
-		if el.hasRecentError(now, maxErrAge) {
-			n++
-		}
-	}
-	return
-}
-
-func (f *eventFamily) Copy(now time.Time, maxErrAge time.Duration) (els eventLogs) {
-	f.mu.RLock()
-	defer f.mu.RUnlock()
-	els = make(eventLogs, 0, len(f.eventLogs))
-	for _, el := range f.eventLogs {
-		if el.hasRecentError(now, maxErrAge) {
-			el.ref()
-			els = append(els, el)
-		}
-	}
-	return
-}
-
-type eventLogs []*eventLog
-
-// Free calls unref on each element of the list.
-func (els eventLogs) Free() {
-	for _, el := range els {
-		el.unref()
-	}
-}
-
-// eventLogs may be sorted in reverse chronological order.
-func (els eventLogs) Len() int           { return len(els) }
-func (els eventLogs) Less(i, j int) bool { return els[i].Start.After(els[j].Start) }
-func (els eventLogs) Swap(i, j int)      { els[i], els[j] = els[j], els[i] }
-
-// A logEntry is a timestamped log entry in an event log.
-type logEntry struct {
-	When    time.Time
-	Elapsed time.Duration // since previous event in log
-	NewDay  bool          // whether this event is on a different day to the previous event
-	What    string
-	IsErr   bool
-}
-
-// WhenString returns a string representation of the elapsed time of the event.
-// It will include the date if midnight was crossed.
-func (e logEntry) WhenString() string {
-	if e.NewDay {
-		return e.When.Format("2006/01/02 15:04:05.000000")
-	}
-	return e.When.Format("15:04:05.000000")
-}
-
-// An eventLog represents an active event log.
-type eventLog struct {
-	// Family is the top-level grouping of event logs to which this belongs.
-	Family string
-
-	// Title is the title of this event log.
-	Title string
-
-	// Timing information.
-	Start time.Time
-
-	// Call stack where this event log was created.
-	stack []uintptr
-
-	// Append-only sequence of events.
-	//
-	// TODO(sameer): change this to a ring buffer to avoid the array copy
-	// when we hit maxEventsPerLog.
-	mu            sync.RWMutex
-	events        []logEntry
-	LastErrorTime time.Time
-	discarded     int
-
-	refs int32 // how many buckets this is in
-}
-
-func (el *eventLog) reset() {
-	// Clear all but the mutex. Mutexes may not be copied, even when unlocked.
-	el.Family = ""
-	el.Title = ""
-	el.Start = time.Time{}
-	el.stack = nil
-	el.events = nil
-	el.LastErrorTime = time.Time{}
-	el.discarded = 0
-	el.refs = 0
-}
-
-func (el *eventLog) hasRecentError(now time.Time, maxErrAge time.Duration) bool {
-	if maxErrAge == 0 {
-		return true
-	}
-	el.mu.RLock()
-	defer el.mu.RUnlock()
-	return now.Sub(el.LastErrorTime) < maxErrAge
-}
-
-// delta returns the elapsed time since the last event or the log start,
-// and whether it spans midnight.
-// L >= el.mu
-func (el *eventLog) delta(t time.Time) (time.Duration, bool) {
-	if len(el.events) == 0 {
-		return t.Sub(el.Start), false
-	}
-	prev := el.events[len(el.events)-1].When
-	return t.Sub(prev), prev.Day() != t.Day()
-
-}
-
-func (el *eventLog) Printf(format string, a ...interface{}) {
-	el.printf(false, format, a...)
-}
-
-func (el *eventLog) Errorf(format string, a ...interface{}) {
-	el.printf(true, format, a...)
-}
-
-func (el *eventLog) printf(isErr bool, format string, a ...interface{}) {
-	e := logEntry{When: time.Now(), IsErr: isErr, What: fmt.Sprintf(format, a...)}
-	el.mu.Lock()
-	e.Elapsed, e.NewDay = el.delta(e.When)
-	if len(el.events) < maxEventsPerLog {
-		el.events = append(el.events, e)
-	} else {
-		// Discard the oldest event.
-		if el.discarded == 0 {
-			// el.discarded starts at two to count for the event it
-			// is replacing, plus the next one that we are about to
-			// drop.
-			el.discarded = 2
-		} else {
-			el.discarded++
-		}
-		// TODO(sameer): if this causes allocations on a critical path,
-		// change eventLog.What to be a fmt.Stringer, as in trace.go.
-		el.events[0].What = fmt.Sprintf("(%d events discarded)", el.discarded)
-		// The timestamp of the discarded meta-event should be
-		// the time of the last event it is representing.
-		el.events[0].When = el.events[1].When
-		copy(el.events[1:], el.events[2:])
-		el.events[maxEventsPerLog-1] = e
-	}
-	if e.IsErr {
-		el.LastErrorTime = e.When
-	}
-	el.mu.Unlock()
-}
-
-func (el *eventLog) ref() {
-	atomic.AddInt32(&el.refs, 1)
-}
-
-func (el *eventLog) unref() {
-	if atomic.AddInt32(&el.refs, -1) == 0 {
-		freeEventLog(el)
-	}
-}
-
-func (el *eventLog) When() string {
-	return el.Start.Format("2006/01/02 15:04:05.000000")
-}
-
-func (el *eventLog) ElapsedTime() string {
-	elapsed := time.Since(el.Start)
-	return fmt.Sprintf("%.6f", elapsed.Seconds())
-}
-
-func (el *eventLog) Stack() string {
-	buf := new(bytes.Buffer)
-	tw := tabwriter.NewWriter(buf, 1, 8, 1, '\t', 0)
-	printStackRecord(tw, el.stack)
-	tw.Flush()
-	return buf.String()
-}
-
-// printStackRecord prints the function + source line information
-// for a single stack trace.
-// Adapted from runtime/pprof/pprof.go.
-func printStackRecord(w io.Writer, stk []uintptr) {
-	for _, pc := range stk {
-		f := runtime.FuncForPC(pc)
-		if f == nil {
-			continue
-		}
-		file, line := f.FileLine(pc)
-		name := f.Name()
-		// Hide runtime.goexit and any runtime functions at the beginning.
-		if strings.HasPrefix(name, "runtime.") {
-			continue
-		}
-		fmt.Fprintf(w, "#   %s\t%s:%d\n", name, file, line)
-	}
-}
-
-func (el *eventLog) Events() []logEntry {
-	el.mu.RLock()
-	defer el.mu.RUnlock()
-	return el.events
-}
-
-// freeEventLogs is a freelist of *eventLog
-var freeEventLogs = make(chan *eventLog, 1000)
-
-// newEventLog returns a event log ready to use.
-func newEventLog() *eventLog {
-	select {
-	case el := <-freeEventLogs:
-		return el
-	default:
-		return new(eventLog)
-	}
-}
-
-// freeEventLog adds el to freeEventLogs if there's room.
-// This is non-blocking.
-func freeEventLog(el *eventLog) {
-	el.reset()
-	select {
-	case freeEventLogs <- el:
-	default:
-	}
-}
-
-var eventsTmplCache *template.Template
-var eventsTmplOnce sync.Once
-
-func eventsTmpl() *template.Template {
-	eventsTmplOnce.Do(func() {
-		eventsTmplCache = template.Must(template.New("events").Funcs(template.FuncMap{
-			"elapsed":   elapsed,
-			"trimSpace": strings.TrimSpace,
-		}).Parse(eventsHTML))
-	})
-	return eventsTmplCache
-}
-
-const eventsHTML = `
-<html>
-	<head>
-		<title>events</title>
-	</head>
-	<style type="text/css">
-		body {
-			font-family: sans-serif;
-		}
-		table#req-status td.family {
-			padding-right: 2em;
-		}
-		table#req-status td.active {
-			padding-right: 1em;
-		}
-		table#req-status td.empty {
-			color: #aaa;
-		}
-		table#reqs {
-			margin-top: 1em;
-		}
-		table#reqs tr.first {
-			{{if $.Expanded}}font-weight: bold;{{end}}
-		}
-		table#reqs td {
-			font-family: monospace;
-		}
-		table#reqs td.when {
-			text-align: right;
-			white-space: nowrap;
-		}
-		table#reqs td.elapsed {
-			padding: 0 0.5em;
-			text-align: right;
-			white-space: pre;
-			width: 10em;
-		}
-		address {
-			font-size: smaller;
-			margin-top: 5em;
-		}
-	</style>
-	<body>
-
-<h1>/debug/events</h1>
-
-<table id="req-status">
-	{{range $i, $fam := .Families}}
-	<tr>
-		<td class="family">{{$fam}}</td>
-
-	        {{range $j, $bucket := $.Buckets}}
-	        {{$n := index $.Counts $i $j}}
-		<td class="{{if not $bucket.MaxErrAge}}active{{end}}{{if not $n}}empty{{end}}">
-	                {{if $n}}<a href="?fam={{$fam}}&b={{$j}}{{if $.Expanded}}&exp=1{{end}}">{{end}}
-		        [{{$n}} {{$bucket.String}}]
-			{{if $n}}</a>{{end}}
-		</td>
-                {{end}}
-
-	</tr>{{end}}
-</table>
-
-{{if $.EventLogs}}
-<hr />
-<h3>Family: {{$.Family}}</h3>
-
-{{if $.Expanded}}<a href="?fam={{$.Family}}&b={{$.Bucket}}">{{end}}
-[Summary]{{if $.Expanded}}</a>{{end}}
-
-{{if not $.Expanded}}<a href="?fam={{$.Family}}&b={{$.Bucket}}&exp=1">{{end}}
-[Expanded]{{if not $.Expanded}}</a>{{end}}
-
-<table id="reqs">
-	<tr><th>When</th><th>Elapsed</th></tr>
-	{{range $el := $.EventLogs}}
-	<tr class="first">
-		<td class="when">{{$el.When}}</td>
-		<td class="elapsed">{{$el.ElapsedTime}}</td>
-		<td>{{$el.Title}}
-	</tr>
-	{{if $.Expanded}}
-	<tr>
-		<td class="when"></td>
-		<td class="elapsed"></td>
-		<td><pre>{{$el.Stack|trimSpace}}</pre></td>
-	</tr>
-	{{range $el.Events}}
-	<tr>
-		<td class="when">{{.WhenString}}</td>
-		<td class="elapsed">{{elapsed .Elapsed}}</td>
-		<td>.{{if .IsErr}}E{{else}}.{{end}}. {{.What}}</td>
-	</tr>
-	{{end}}
-	{{end}}
-	{{end}}
-</table>
-{{end}}
-	</body>
-</html>
-`
diff --git a/vendor/golang.org/x/net/trace/histogram.go b/vendor/golang.org/x/net/trace/histogram.go
deleted file mode 100644
index d6c7110..0000000
--- a/vendor/golang.org/x/net/trace/histogram.go
+++ /dev/null
@@ -1,365 +0,0 @@
-// 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
-
-// This file implements histogramming for RPC statistics collection.
-
-import (
-	"bytes"
-	"fmt"
-	"html/template"
-	"log"
-	"math"
-	"sync"
-
-	"golang.org/x/net/internal/timeseries"
-)
-
-const (
-	bucketCount = 38
-)
-
-// histogram keeps counts of values in buckets that are spaced
-// out in powers of 2: 0-1, 2-3, 4-7...
-// histogram implements timeseries.Observable
-type histogram struct {
-	sum          int64   // running total of measurements
-	sumOfSquares float64 // square of running total
-	buckets      []int64 // bucketed values for histogram
-	value        int     // holds a single value as an optimization
-	valueCount   int64   // number of values recorded for single value
-}
-
-// addMeasurement records a value measurement observation to the histogram.
-func (h *histogram) addMeasurement(value int64) {
-	// TODO: assert invariant
-	h.sum += value
-	h.sumOfSquares += float64(value) * float64(value)
-
-	bucketIndex := getBucket(value)
-
-	if h.valueCount == 0 || (h.valueCount > 0 && h.value == bucketIndex) {
-		h.value = bucketIndex
-		h.valueCount++
-	} else {
-		h.allocateBuckets()
-		h.buckets[bucketIndex]++
-	}
-}
-
-func (h *histogram) allocateBuckets() {
-	if h.buckets == nil {
-		h.buckets = make([]int64, bucketCount)
-		h.buckets[h.value] = h.valueCount
-		h.value = 0
-		h.valueCount = -1
-	}
-}
-
-func log2(i int64) int {
-	n := 0
-	for ; i >= 0x100; i >>= 8 {
-		n += 8
-	}
-	for ; i > 0; i >>= 1 {
-		n += 1
-	}
-	return n
-}
-
-func getBucket(i int64) (index int) {
-	index = log2(i) - 1
-	if index < 0 {
-		index = 0
-	}
-	if index >= bucketCount {
-		index = bucketCount - 1
-	}
-	return
-}
-
-// Total returns the number of recorded observations.
-func (h *histogram) total() (total int64) {
-	if h.valueCount >= 0 {
-		total = h.valueCount
-	}
-	for _, val := range h.buckets {
-		total += int64(val)
-	}
-	return
-}
-
-// Average returns the average value of recorded observations.
-func (h *histogram) average() float64 {
-	t := h.total()
-	if t == 0 {
-		return 0
-	}
-	return float64(h.sum) / float64(t)
-}
-
-// Variance returns the variance of recorded observations.
-func (h *histogram) variance() float64 {
-	t := float64(h.total())
-	if t == 0 {
-		return 0
-	}
-	s := float64(h.sum) / t
-	return h.sumOfSquares/t - s*s
-}
-
-// StandardDeviation returns the standard deviation of recorded observations.
-func (h *histogram) standardDeviation() float64 {
-	return math.Sqrt(h.variance())
-}
-
-// PercentileBoundary estimates the value that the given fraction of recorded
-// observations are less than.
-func (h *histogram) percentileBoundary(percentile float64) int64 {
-	total := h.total()
-
-	// Corner cases (make sure result is strictly less than Total())
-	if total == 0 {
-		return 0
-	} else if total == 1 {
-		return int64(h.average())
-	}
-
-	percentOfTotal := round(float64(total) * percentile)
-	var runningTotal int64
-
-	for i := range h.buckets {
-		value := h.buckets[i]
-		runningTotal += value
-		if runningTotal == percentOfTotal {
-			// We hit an exact bucket boundary. If the next bucket has data, it is a
-			// good estimate of the value. If the bucket is empty, we interpolate the
-			// midpoint between the next bucket's boundary and the next non-zero
-			// bucket. If the remaining buckets are all empty, then we use the
-			// boundary for the next bucket as the estimate.
-			j := uint8(i + 1)
-			min := bucketBoundary(j)
-			if runningTotal < total {
-				for h.buckets[j] == 0 {
-					j++
-				}
-			}
-			max := bucketBoundary(j)
-			return min + round(float64(max-min)/2)
-		} else if runningTotal > percentOfTotal {
-			// The value is in this bucket. Interpolate the value.
-			delta := runningTotal - percentOfTotal
-			percentBucket := float64(value-delta) / float64(value)
-			bucketMin := bucketBoundary(uint8(i))
-			nextBucketMin := bucketBoundary(uint8(i + 1))
-			bucketSize := nextBucketMin - bucketMin
-			return bucketMin + round(percentBucket*float64(bucketSize))
-		}
-	}
-	return bucketBoundary(bucketCount - 1)
-}
-
-// Median returns the estimated median of the observed values.
-func (h *histogram) median() int64 {
-	return h.percentileBoundary(0.5)
-}
-
-// Add adds other to h.
-func (h *histogram) Add(other timeseries.Observable) {
-	o := other.(*histogram)
-	if o.valueCount == 0 {
-		// Other histogram is empty
-	} else if h.valueCount >= 0 && o.valueCount > 0 && h.value == o.value {
-		// Both have a single bucketed value, aggregate them
-		h.valueCount += o.valueCount
-	} else {
-		// Two different values necessitate buckets in this histogram
-		h.allocateBuckets()
-		if o.valueCount >= 0 {
-			h.buckets[o.value] += o.valueCount
-		} else {
-			for i := range h.buckets {
-				h.buckets[i] += o.buckets[i]
-			}
-		}
-	}
-	h.sumOfSquares += o.sumOfSquares
-	h.sum += o.sum
-}
-
-// Clear resets the histogram to an empty state, removing all observed values.
-func (h *histogram) Clear() {
-	h.buckets = nil
-	h.value = 0
-	h.valueCount = 0
-	h.sum = 0
-	h.sumOfSquares = 0
-}
-
-// CopyFrom copies from other, which must be a *histogram, into h.
-func (h *histogram) CopyFrom(other timeseries.Observable) {
-	o := other.(*histogram)
-	if o.valueCount == -1 {
-		h.allocateBuckets()
-		copy(h.buckets, o.buckets)
-	}
-	h.sum = o.sum
-	h.sumOfSquares = o.sumOfSquares
-	h.value = o.value
-	h.valueCount = o.valueCount
-}
-
-// Multiply scales the histogram by the specified ratio.
-func (h *histogram) Multiply(ratio float64) {
-	if h.valueCount == -1 {
-		for i := range h.buckets {
-			h.buckets[i] = int64(float64(h.buckets[i]) * ratio)
-		}
-	} else {
-		h.valueCount = int64(float64(h.valueCount) * ratio)
-	}
-	h.sum = int64(float64(h.sum) * ratio)
-	h.sumOfSquares = h.sumOfSquares * ratio
-}
-
-// New creates a new histogram.
-func (h *histogram) New() timeseries.Observable {
-	r := new(histogram)
-	r.Clear()
-	return r
-}
-
-func (h *histogram) String() string {
-	return fmt.Sprintf("%d, %f, %d, %d, %v",
-		h.sum, h.sumOfSquares, h.value, h.valueCount, h.buckets)
-}
-
-// round returns the closest int64 to the argument
-func round(in float64) int64 {
-	return int64(math.Floor(in + 0.5))
-}
-
-// bucketBoundary returns the first value in the bucket.
-func bucketBoundary(bucket uint8) int64 {
-	if bucket == 0 {
-		return 0
-	}
-	return 1 << bucket
-}
-
-// bucketData holds data about a specific bucket for use in distTmpl.
-type bucketData struct {
-	Lower, Upper       int64
-	N                  int64
-	Pct, CumulativePct float64
-	GraphWidth         int
-}
-
-// data holds data about a Distribution for use in distTmpl.
-type data struct {
-	Buckets                 []*bucketData
-	Count, Median           int64
-	Mean, StandardDeviation float64
-}
-
-// maxHTMLBarWidth is the maximum width of the HTML bar for visualizing buckets.
-const maxHTMLBarWidth = 350.0
-
-// newData returns data representing h for use in distTmpl.
-func (h *histogram) newData() *data {
-	// Force the allocation of buckets to simplify the rendering implementation
-	h.allocateBuckets()
-	// We scale the bars on the right so that the largest bar is
-	// maxHTMLBarWidth pixels in width.
-	maxBucket := int64(0)
-	for _, n := range h.buckets {
-		if n > maxBucket {
-			maxBucket = n
-		}
-	}
-	total := h.total()
-	barsizeMult := maxHTMLBarWidth / float64(maxBucket)
-	var pctMult float64
-	if total == 0 {
-		pctMult = 1.0
-	} else {
-		pctMult = 100.0 / float64(total)
-	}
-
-	buckets := make([]*bucketData, len(h.buckets))
-	runningTotal := int64(0)
-	for i, n := range h.buckets {
-		if n == 0 {
-			continue
-		}
-		runningTotal += n
-		var upperBound int64
-		if i < bucketCount-1 {
-			upperBound = bucketBoundary(uint8(i + 1))
-		} else {
-			upperBound = math.MaxInt64
-		}
-		buckets[i] = &bucketData{
-			Lower:         bucketBoundary(uint8(i)),
-			Upper:         upperBound,
-			N:             n,
-			Pct:           float64(n) * pctMult,
-			CumulativePct: float64(runningTotal) * pctMult,
-			GraphWidth:    int(float64(n) * barsizeMult),
-		}
-	}
-	return &data{
-		Buckets:           buckets,
-		Count:             total,
-		Median:            h.median(),
-		Mean:              h.average(),
-		StandardDeviation: h.standardDeviation(),
-	}
-}
-
-func (h *histogram) html() template.HTML {
-	buf := new(bytes.Buffer)
-	if err := distTmpl().Execute(buf, h.newData()); err != nil {
-		buf.Reset()
-		log.Printf("net/trace: couldn't execute template: %v", err)
-	}
-	return template.HTML(buf.String())
-}
-
-var distTmplCache *template.Template
-var distTmplOnce sync.Once
-
-func distTmpl() *template.Template {
-	distTmplOnce.Do(func() {
-		// Input: data
-		distTmplCache = template.Must(template.New("distTmpl").Parse(`
-<table>
-<tr>
-    <td style="padding:0.25em">Count: {{.Count}}</td>
-    <td style="padding:0.25em">Mean: {{printf "%.0f" .Mean}}</td>
-    <td style="padding:0.25em">StdDev: {{printf "%.0f" .StandardDeviation}}</td>
-    <td style="padding:0.25em">Median: {{.Median}}</td>
-</tr>
-</table>
-<hr>
-<table>
-{{range $b := .Buckets}}
-{{if $b}}
-  <tr>
-    <td style="padding:0 0 0 0.25em">[</td>
-    <td style="text-align:right;padding:0 0.25em">{{.Lower}},</td>
-    <td style="text-align:right;padding:0 0.25em">{{.Upper}})</td>
-    <td style="text-align:right;padding:0 0.25em">{{.N}}</td>
-    <td style="text-align:right;padding:0 0.25em">{{printf "%#.3f" .Pct}}%</td>
-    <td style="text-align:right;padding:0 0.25em">{{printf "%#.3f" .CumulativePct}}%</td>
-    <td><div style="background-color: blue; height: 1em; width: {{.GraphWidth}};"></div></td>
-  </tr>
-{{end}}
-{{end}}
-</table>
-`))
-	})
-	return distTmplCache
-}
diff --git a/vendor/golang.org/x/net/trace/trace.go b/vendor/golang.org/x/net/trace/trace.go
deleted file mode 100644
index eae2a99..0000000
--- a/vendor/golang.org/x/net/trace/trace.go
+++ /dev/null
@@ -1,1130 +0,0 @@
-// 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 implements tracing of requests and long-lived objects.
-It exports HTTP interfaces on /debug/requests and /debug/events.
-
-A trace.Trace provides tracing for short-lived objects, usually requests.
-A request handler might be implemented like this:
-
-	func fooHandler(w http.ResponseWriter, req *http.Request) {
-		tr := trace.New("mypkg.Foo", req.URL.Path)
-		defer tr.Finish()
-		...
-		tr.LazyPrintf("some event %q happened", str)
-		...
-		if err := somethingImportant(); err != nil {
-			tr.LazyPrintf("somethingImportant failed: %v", err)
-			tr.SetError()
-		}
-	}
-
-The /debug/requests HTTP endpoint organizes the traces by family,
-errors, and duration.  It also provides histogram of request duration
-for each family.
-
-A trace.EventLog provides tracing for long-lived objects, such as RPC
-connections.
-
-	// A Fetcher fetches URL paths for a single domain.
-	type Fetcher struct {
-		domain string
-		events trace.EventLog
-	}
-
-	func NewFetcher(domain string) *Fetcher {
-		return &Fetcher{
-			domain,
-			trace.NewEventLog("mypkg.Fetcher", domain),
-		}
-	}
-
-	func (f *Fetcher) Fetch(path string) (string, error) {
-		resp, err := http.Get("http://" + f.domain + "/" + path)
-		if err != nil {
-			f.events.Errorf("Get(%q) = %v", path, err)
-			return "", err
-		}
-		f.events.Printf("Get(%q) = %s", path, resp.Status)
-		...
-	}
-
-	func (f *Fetcher) Close() error {
-		f.events.Finish()
-		return nil
-	}
-
-The /debug/events HTTP endpoint organizes the event logs by family and
-by time since the last error.  The expanded view displays recent log
-entries and the log's call stack.
-*/
-package trace // import "golang.org/x/net/trace"
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"html/template"
-	"io"
-	"log"
-	"net"
-	"net/http"
-	"net/url"
-	"runtime"
-	"sort"
-	"strconv"
-	"sync"
-	"sync/atomic"
-	"time"
-
-	"golang.org/x/net/internal/timeseries"
-)
-
-// DebugUseAfterFinish controls whether to debug uses of Trace values after finishing.
-// FOR DEBUGGING ONLY. This will slow down the program.
-var DebugUseAfterFinish = false
-
-// HTTP ServeMux paths.
-const (
-	debugRequestsPath = "/debug/requests"
-	debugEventsPath   = "/debug/events"
-)
-
-// AuthRequest determines whether a specific request is permitted to load the
-// /debug/requests or /debug/events pages.
-//
-// It returns two bools; the first indicates whether the page may be viewed at all,
-// and the second indicates whether sensitive events will be shown.
-//
-// AuthRequest may be replaced by a program to customize its authorization requirements.
-//
-// The default AuthRequest function returns (true, true) if and only if the request
-// comes from localhost/127.0.0.1/[::1].
-var AuthRequest = func(req *http.Request) (any, sensitive bool) {
-	// RemoteAddr is commonly in the form "IP" or "IP:port".
-	// If it is in the form "IP:port", split off the port.
-	host, _, err := net.SplitHostPort(req.RemoteAddr)
-	if err != nil {
-		host = req.RemoteAddr
-	}
-	switch host {
-	case "localhost", "127.0.0.1", "::1":
-		return true, true
-	default:
-		return false, false
-	}
-}
-
-func init() {
-	_, pat := http.DefaultServeMux.Handler(&http.Request{URL: &url.URL{Path: debugRequestsPath}})
-	if pat == debugRequestsPath {
-		panic("/debug/requests is already registered. You may have two independent copies of " +
-			"golang.org/x/net/trace in your binary, trying to maintain separate state. This may " +
-			"involve a vendored copy of golang.org/x/net/trace.")
-	}
-
-	// TODO(jbd): Serve Traces from /debug/traces in the future?
-	// There is no requirement for a request to be present to have traces.
-	http.HandleFunc(debugRequestsPath, Traces)
-	http.HandleFunc(debugEventsPath, Events)
-}
-
-// NewContext returns a copy of the parent context
-// and associates it with a Trace.
-func NewContext(ctx context.Context, tr Trace) context.Context {
-	return context.WithValue(ctx, contextKey, tr)
-}
-
-// FromContext returns the Trace bound to the context, if any.
-func FromContext(ctx context.Context) (tr Trace, ok bool) {
-	tr, ok = ctx.Value(contextKey).(Trace)
-	return
-}
-
-// Traces responds with traces from the program.
-// The package initialization registers it in http.DefaultServeMux
-// at /debug/requests.
-//
-// It performs authorization by running AuthRequest.
-func Traces(w http.ResponseWriter, req *http.Request) {
-	any, sensitive := AuthRequest(req)
-	if !any {
-		http.Error(w, "not allowed", http.StatusUnauthorized)
-		return
-	}
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	Render(w, req, sensitive)
-}
-
-// Events responds with a page of events collected by EventLogs.
-// The package initialization registers it in http.DefaultServeMux
-// at /debug/events.
-//
-// It performs authorization by running AuthRequest.
-func Events(w http.ResponseWriter, req *http.Request) {
-	any, sensitive := AuthRequest(req)
-	if !any {
-		http.Error(w, "not allowed", http.StatusUnauthorized)
-		return
-	}
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	RenderEvents(w, req, sensitive)
-}
-
-// Render renders the HTML page typically served at /debug/requests.
-// It does not do any auth checking. The request may be nil.
-//
-// Most users will use the Traces handler.
-func Render(w io.Writer, req *http.Request, sensitive bool) {
-	data := &struct {
-		Families         []string
-		ActiveTraceCount map[string]int
-		CompletedTraces  map[string]*family
-
-		// Set when a bucket has been selected.
-		Traces        traceList
-		Family        string
-		Bucket        int
-		Expanded      bool
-		Traced        bool
-		Active        bool
-		ShowSensitive bool // whether to show sensitive events
-
-		Histogram       template.HTML
-		HistogramWindow string // e.g. "last minute", "last hour", "all time"
-
-		// If non-zero, the set of traces is a partial set,
-		// and this is the total number.
-		Total int
-	}{
-		CompletedTraces: completedTraces,
-	}
-
-	data.ShowSensitive = sensitive
-	if req != nil {
-		// Allow show_sensitive=0 to force hiding of sensitive data for testing.
-		// This only goes one way; you can't use show_sensitive=1 to see things.
-		if req.FormValue("show_sensitive") == "0" {
-			data.ShowSensitive = false
-		}
-
-		if exp, err := strconv.ParseBool(req.FormValue("exp")); err == nil {
-			data.Expanded = exp
-		}
-		if exp, err := strconv.ParseBool(req.FormValue("rtraced")); err == nil {
-			data.Traced = exp
-		}
-	}
-
-	completedMu.RLock()
-	data.Families = make([]string, 0, len(completedTraces))
-	for fam := range completedTraces {
-		data.Families = append(data.Families, fam)
-	}
-	completedMu.RUnlock()
-	sort.Strings(data.Families)
-
-	// We are careful here to minimize the time spent locking activeMu,
-	// since that lock is required every time an RPC starts and finishes.
-	data.ActiveTraceCount = make(map[string]int, len(data.Families))
-	activeMu.RLock()
-	for fam, s := range activeTraces {
-		data.ActiveTraceCount[fam] = s.Len()
-	}
-	activeMu.RUnlock()
-
-	var ok bool
-	data.Family, data.Bucket, ok = parseArgs(req)
-	switch {
-	case !ok:
-		// No-op
-	case data.Bucket == -1:
-		data.Active = true
-		n := data.ActiveTraceCount[data.Family]
-		data.Traces = getActiveTraces(data.Family)
-		if len(data.Traces) < n {
-			data.Total = n
-		}
-	case data.Bucket < bucketsPerFamily:
-		if b := lookupBucket(data.Family, data.Bucket); b != nil {
-			data.Traces = b.Copy(data.Traced)
-		}
-	default:
-		if f := getFamily(data.Family, false); f != nil {
-			var obs timeseries.Observable
-			f.LatencyMu.RLock()
-			switch o := data.Bucket - bucketsPerFamily; o {
-			case 0:
-				obs = f.Latency.Minute()
-				data.HistogramWindow = "last minute"
-			case 1:
-				obs = f.Latency.Hour()
-				data.HistogramWindow = "last hour"
-			case 2:
-				obs = f.Latency.Total()
-				data.HistogramWindow = "all time"
-			}
-			f.LatencyMu.RUnlock()
-			if obs != nil {
-				data.Histogram = obs.(*histogram).html()
-			}
-		}
-	}
-
-	if data.Traces != nil {
-		defer data.Traces.Free()
-		sort.Sort(data.Traces)
-	}
-
-	completedMu.RLock()
-	defer completedMu.RUnlock()
-	if err := pageTmpl().ExecuteTemplate(w, "Page", data); err != nil {
-		log.Printf("net/trace: Failed executing template: %v", err)
-	}
-}
-
-func parseArgs(req *http.Request) (fam string, b int, ok bool) {
-	if req == nil {
-		return "", 0, false
-	}
-	fam, bStr := req.FormValue("fam"), req.FormValue("b")
-	if fam == "" || bStr == "" {
-		return "", 0, false
-	}
-	b, err := strconv.Atoi(bStr)
-	if err != nil || b < -1 {
-		return "", 0, false
-	}
-
-	return fam, b, true
-}
-
-func lookupBucket(fam string, b int) *traceBucket {
-	f := getFamily(fam, false)
-	if f == nil || b < 0 || b >= len(f.Buckets) {
-		return nil
-	}
-	return f.Buckets[b]
-}
-
-type contextKeyT string
-
-var contextKey = contextKeyT("golang.org/x/net/trace.Trace")
-
-// Trace represents an active request.
-type Trace interface {
-	// LazyLog adds x to the event log. It will be evaluated each time the
-	// /debug/requests page is rendered. Any memory referenced by x will be
-	// pinned until the trace is finished and later discarded.
-	LazyLog(x fmt.Stringer, sensitive bool)
-
-	// LazyPrintf evaluates its arguments with fmt.Sprintf each time the
-	// /debug/requests page is rendered. Any memory referenced by a will be
-	// pinned until the trace is finished and later discarded.
-	LazyPrintf(format string, a ...interface{})
-
-	// SetError declares that this trace resulted in an error.
-	SetError()
-
-	// SetRecycler sets a recycler for the trace.
-	// f will be called for each event passed to LazyLog at a time when
-	// it is no longer required, whether while the trace is still active
-	// and the event is discarded, or when a completed trace is discarded.
-	SetRecycler(f func(interface{}))
-
-	// SetTraceInfo sets the trace info for the trace.
-	// This is currently unused.
-	SetTraceInfo(traceID, spanID uint64)
-
-	// SetMaxEvents sets the maximum number of events that will be stored
-	// in the trace. This has no effect if any events have already been
-	// added to the trace.
-	SetMaxEvents(m int)
-
-	// Finish declares that this trace is complete.
-	// The trace should not be used after calling this method.
-	Finish()
-}
-
-type lazySprintf struct {
-	format string
-	a      []interface{}
-}
-
-func (l *lazySprintf) String() string {
-	return fmt.Sprintf(l.format, l.a...)
-}
-
-// New returns a new Trace with the specified family and title.
-func New(family, title string) Trace {
-	tr := newTrace()
-	tr.ref()
-	tr.Family, tr.Title = family, title
-	tr.Start = time.Now()
-	tr.maxEvents = maxEventsPerTrace
-	tr.events = tr.eventsBuf[:0]
-
-	activeMu.RLock()
-	s := activeTraces[tr.Family]
-	activeMu.RUnlock()
-	if s == nil {
-		activeMu.Lock()
-		s = activeTraces[tr.Family] // check again
-		if s == nil {
-			s = new(traceSet)
-			activeTraces[tr.Family] = s
-		}
-		activeMu.Unlock()
-	}
-	s.Add(tr)
-
-	// Trigger allocation of the completed trace structure for this family.
-	// This will cause the family to be present in the request page during
-	// the first trace of this family. We don't care about the return value,
-	// nor is there any need for this to run inline, so we execute it in its
-	// own goroutine, but only if the family isn't allocated yet.
-	completedMu.RLock()
-	if _, ok := completedTraces[tr.Family]; !ok {
-		go allocFamily(tr.Family)
-	}
-	completedMu.RUnlock()
-
-	return tr
-}
-
-func (tr *trace) Finish() {
-	elapsed := time.Since(tr.Start)
-	tr.mu.Lock()
-	tr.Elapsed = elapsed
-	tr.mu.Unlock()
-
-	if DebugUseAfterFinish {
-		buf := make([]byte, 4<<10) // 4 KB should be enough
-		n := runtime.Stack(buf, false)
-		tr.finishStack = buf[:n]
-	}
-
-	activeMu.RLock()
-	m := activeTraces[tr.Family]
-	activeMu.RUnlock()
-	m.Remove(tr)
-
-	f := getFamily(tr.Family, true)
-	tr.mu.RLock() // protects tr fields in Cond.match calls
-	for _, b := range f.Buckets {
-		if b.Cond.match(tr) {
-			b.Add(tr)
-		}
-	}
-	tr.mu.RUnlock()
-
-	// Add a sample of elapsed time as microseconds to the family's timeseries
-	h := new(histogram)
-	h.addMeasurement(elapsed.Nanoseconds() / 1e3)
-	f.LatencyMu.Lock()
-	f.Latency.Add(h)
-	f.LatencyMu.Unlock()
-
-	tr.unref() // matches ref in New
-}
-
-const (
-	bucketsPerFamily    = 9
-	tracesPerBucket     = 10
-	maxActiveTraces     = 20 // Maximum number of active traces to show.
-	maxEventsPerTrace   = 10
-	numHistogramBuckets = 38
-)
-
-var (
-	// The active traces.
-	activeMu     sync.RWMutex
-	activeTraces = make(map[string]*traceSet) // family -> traces
-
-	// Families of completed traces.
-	completedMu     sync.RWMutex
-	completedTraces = make(map[string]*family) // family -> traces
-)
-
-type traceSet struct {
-	mu sync.RWMutex
-	m  map[*trace]bool
-
-	// We could avoid the entire map scan in FirstN by having a slice of all the traces
-	// ordered by start time, and an index into that from the trace struct, with a periodic
-	// repack of the slice after enough traces finish; we could also use a skip list or similar.
-	// However, that would shift some of the expense from /debug/requests time to RPC time,
-	// which is probably the wrong trade-off.
-}
-
-func (ts *traceSet) Len() int {
-	ts.mu.RLock()
-	defer ts.mu.RUnlock()
-	return len(ts.m)
-}
-
-func (ts *traceSet) Add(tr *trace) {
-	ts.mu.Lock()
-	if ts.m == nil {
-		ts.m = make(map[*trace]bool)
-	}
-	ts.m[tr] = true
-	ts.mu.Unlock()
-}
-
-func (ts *traceSet) Remove(tr *trace) {
-	ts.mu.Lock()
-	delete(ts.m, tr)
-	ts.mu.Unlock()
-}
-
-// FirstN returns the first n traces ordered by time.
-func (ts *traceSet) FirstN(n int) traceList {
-	ts.mu.RLock()
-	defer ts.mu.RUnlock()
-
-	if n > len(ts.m) {
-		n = len(ts.m)
-	}
-	trl := make(traceList, 0, n)
-
-	// Fast path for when no selectivity is needed.
-	if n == len(ts.m) {
-		for tr := range ts.m {
-			tr.ref()
-			trl = append(trl, tr)
-		}
-		sort.Sort(trl)
-		return trl
-	}
-
-	// Pick the oldest n traces.
-	// This is inefficient. See the comment in the traceSet struct.
-	for tr := range ts.m {
-		// Put the first n traces into trl in the order they occur.
-		// When we have n, sort trl, and thereafter maintain its order.
-		if len(trl) < n {
-			tr.ref()
-			trl = append(trl, tr)
-			if len(trl) == n {
-				// This is guaranteed to happen exactly once during this loop.
-				sort.Sort(trl)
-			}
-			continue
-		}
-		if tr.Start.After(trl[n-1].Start) {
-			continue
-		}
-
-		// Find where to insert this one.
-		tr.ref()
-		i := sort.Search(n, func(i int) bool { return trl[i].Start.After(tr.Start) })
-		trl[n-1].unref()
-		copy(trl[i+1:], trl[i:])
-		trl[i] = tr
-	}
-
-	return trl
-}
-
-func getActiveTraces(fam string) traceList {
-	activeMu.RLock()
-	s := activeTraces[fam]
-	activeMu.RUnlock()
-	if s == nil {
-		return nil
-	}
-	return s.FirstN(maxActiveTraces)
-}
-
-func getFamily(fam string, allocNew bool) *family {
-	completedMu.RLock()
-	f := completedTraces[fam]
-	completedMu.RUnlock()
-	if f == nil && allocNew {
-		f = allocFamily(fam)
-	}
-	return f
-}
-
-func allocFamily(fam string) *family {
-	completedMu.Lock()
-	defer completedMu.Unlock()
-	f := completedTraces[fam]
-	if f == nil {
-		f = newFamily()
-		completedTraces[fam] = f
-	}
-	return f
-}
-
-// family represents a set of trace buckets and associated latency information.
-type family struct {
-	// traces may occur in multiple buckets.
-	Buckets [bucketsPerFamily]*traceBucket
-
-	// latency time series
-	LatencyMu sync.RWMutex
-	Latency   *timeseries.MinuteHourSeries
-}
-
-func newFamily() *family {
-	return &family{
-		Buckets: [bucketsPerFamily]*traceBucket{
-			{Cond: minCond(0)},
-			{Cond: minCond(50 * time.Millisecond)},
-			{Cond: minCond(100 * time.Millisecond)},
-			{Cond: minCond(200 * time.Millisecond)},
-			{Cond: minCond(500 * time.Millisecond)},
-			{Cond: minCond(1 * time.Second)},
-			{Cond: minCond(10 * time.Second)},
-			{Cond: minCond(100 * time.Second)},
-			{Cond: errorCond{}},
-		},
-		Latency: timeseries.NewMinuteHourSeries(func() timeseries.Observable { return new(histogram) }),
-	}
-}
-
-// traceBucket represents a size-capped bucket of historic traces,
-// along with a condition for a trace to belong to the bucket.
-type traceBucket struct {
-	Cond cond
-
-	// Ring buffer implementation of a fixed-size FIFO queue.
-	mu     sync.RWMutex
-	buf    [tracesPerBucket]*trace
-	start  int // < tracesPerBucket
-	length int // <= tracesPerBucket
-}
-
-func (b *traceBucket) Add(tr *trace) {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-
-	i := b.start + b.length
-	if i >= tracesPerBucket {
-		i -= tracesPerBucket
-	}
-	if b.length == tracesPerBucket {
-		// "Remove" an element from the bucket.
-		b.buf[i].unref()
-		b.start++
-		if b.start == tracesPerBucket {
-			b.start = 0
-		}
-	}
-	b.buf[i] = tr
-	if b.length < tracesPerBucket {
-		b.length++
-	}
-	tr.ref()
-}
-
-// Copy returns a copy of the traces in the bucket.
-// If tracedOnly is true, only the traces with trace information will be returned.
-// The logs will be ref'd before returning; the caller should call
-// the Free method when it is done with them.
-// TODO(dsymonds): keep track of traced requests in separate buckets.
-func (b *traceBucket) Copy(tracedOnly bool) traceList {
-	b.mu.RLock()
-	defer b.mu.RUnlock()
-
-	trl := make(traceList, 0, b.length)
-	for i, x := 0, b.start; i < b.length; i++ {
-		tr := b.buf[x]
-		if !tracedOnly || tr.spanID != 0 {
-			tr.ref()
-			trl = append(trl, tr)
-		}
-		x++
-		if x == b.length {
-			x = 0
-		}
-	}
-	return trl
-}
-
-func (b *traceBucket) Empty() bool {
-	b.mu.RLock()
-	defer b.mu.RUnlock()
-	return b.length == 0
-}
-
-// cond represents a condition on a trace.
-type cond interface {
-	match(t *trace) bool
-	String() string
-}
-
-type minCond time.Duration
-
-func (m minCond) match(t *trace) bool { return t.Elapsed >= time.Duration(m) }
-func (m minCond) String() string      { return fmt.Sprintf("≥%gs", time.Duration(m).Seconds()) }
-
-type errorCond struct{}
-
-func (e errorCond) match(t *trace) bool { return t.IsError }
-func (e errorCond) String() string      { return "errors" }
-
-type traceList []*trace
-
-// Free calls unref on each element of the list.
-func (trl traceList) Free() {
-	for _, t := range trl {
-		t.unref()
-	}
-}
-
-// traceList may be sorted in reverse chronological order.
-func (trl traceList) Len() int           { return len(trl) }
-func (trl traceList) Less(i, j int) bool { return trl[i].Start.After(trl[j].Start) }
-func (trl traceList) Swap(i, j int)      { trl[i], trl[j] = trl[j], trl[i] }
-
-// An event is a timestamped log entry in a trace.
-type event struct {
-	When       time.Time
-	Elapsed    time.Duration // since previous event in trace
-	NewDay     bool          // whether this event is on a different day to the previous event
-	Recyclable bool          // whether this event was passed via LazyLog
-	Sensitive  bool          // whether this event contains sensitive information
-	What       interface{}   // string or fmt.Stringer
-}
-
-// WhenString returns a string representation of the elapsed time of the event.
-// It will include the date if midnight was crossed.
-func (e event) WhenString() string {
-	if e.NewDay {
-		return e.When.Format("2006/01/02 15:04:05.000000")
-	}
-	return e.When.Format("15:04:05.000000")
-}
-
-// discarded represents a number of discarded events.
-// It is stored as *discarded to make it easier to update in-place.
-type discarded int
-
-func (d *discarded) String() string {
-	return fmt.Sprintf("(%d events discarded)", int(*d))
-}
-
-// trace represents an active or complete request,
-// either sent or received by this program.
-type trace struct {
-	// Family is the top-level grouping of traces to which this belongs.
-	Family string
-
-	// Title is the title of this trace.
-	Title string
-
-	// Start time of the this trace.
-	Start time.Time
-
-	mu        sync.RWMutex
-	events    []event // Append-only sequence of events (modulo discards).
-	maxEvents int
-	recycler  func(interface{})
-	IsError   bool          // Whether this trace resulted in an error.
-	Elapsed   time.Duration // Elapsed time for this trace, zero while active.
-	traceID   uint64        // Trace information if non-zero.
-	spanID    uint64
-
-	refs int32     // how many buckets this is in
-	disc discarded // scratch space to avoid allocation
-
-	finishStack []byte // where finish was called, if DebugUseAfterFinish is set
-
-	eventsBuf [4]event // preallocated buffer in case we only log a few events
-}
-
-func (tr *trace) reset() {
-	// Clear all but the mutex. Mutexes may not be copied, even when unlocked.
-	tr.Family = ""
-	tr.Title = ""
-	tr.Start = time.Time{}
-
-	tr.mu.Lock()
-	tr.Elapsed = 0
-	tr.traceID = 0
-	tr.spanID = 0
-	tr.IsError = false
-	tr.maxEvents = 0
-	tr.events = nil
-	tr.recycler = nil
-	tr.mu.Unlock()
-
-	tr.refs = 0
-	tr.disc = 0
-	tr.finishStack = nil
-	for i := range tr.eventsBuf {
-		tr.eventsBuf[i] = event{}
-	}
-}
-
-// delta returns the elapsed time since the last event or the trace start,
-// and whether it spans midnight.
-// L >= tr.mu
-func (tr *trace) delta(t time.Time) (time.Duration, bool) {
-	if len(tr.events) == 0 {
-		return t.Sub(tr.Start), false
-	}
-	prev := tr.events[len(tr.events)-1].When
-	return t.Sub(prev), prev.Day() != t.Day()
-}
-
-func (tr *trace) addEvent(x interface{}, recyclable, sensitive bool) {
-	if DebugUseAfterFinish && tr.finishStack != nil {
-		buf := make([]byte, 4<<10) // 4 KB should be enough
-		n := runtime.Stack(buf, false)
-		log.Printf("net/trace: trace used after finish:\nFinished at:\n%s\nUsed at:\n%s", tr.finishStack, buf[:n])
-	}
-
-	/*
-		NOTE TO DEBUGGERS
-
-		If you are here because your program panicked in this code,
-		it is almost definitely the fault of code using this package,
-		and very unlikely to be the fault of this code.
-
-		The most likely scenario is that some code elsewhere is using
-		a trace.Trace after its Finish method is called.
-		You can temporarily set the DebugUseAfterFinish var
-		to help discover where that is; do not leave that var set,
-		since it makes this package much less efficient.
-	*/
-
-	e := event{When: time.Now(), What: x, Recyclable: recyclable, Sensitive: sensitive}
-	tr.mu.Lock()
-	e.Elapsed, e.NewDay = tr.delta(e.When)
-	if len(tr.events) < tr.maxEvents {
-		tr.events = append(tr.events, e)
-	} else {
-		// Discard the middle events.
-		di := int((tr.maxEvents - 1) / 2)
-		if d, ok := tr.events[di].What.(*discarded); ok {
-			(*d)++
-		} else {
-			// disc starts at two to count for the event it is replacing,
-			// plus the next one that we are about to drop.
-			tr.disc = 2
-			if tr.recycler != nil && tr.events[di].Recyclable {
-				go tr.recycler(tr.events[di].What)
-			}
-			tr.events[di].What = &tr.disc
-		}
-		// The timestamp of the discarded meta-event should be
-		// the time of the last event it is representing.
-		tr.events[di].When = tr.events[di+1].When
-
-		if tr.recycler != nil && tr.events[di+1].Recyclable {
-			go tr.recycler(tr.events[di+1].What)
-		}
-		copy(tr.events[di+1:], tr.events[di+2:])
-		tr.events[tr.maxEvents-1] = e
-	}
-	tr.mu.Unlock()
-}
-
-func (tr *trace) LazyLog(x fmt.Stringer, sensitive bool) {
-	tr.addEvent(x, true, sensitive)
-}
-
-func (tr *trace) LazyPrintf(format string, a ...interface{}) {
-	tr.addEvent(&lazySprintf{format, a}, false, false)
-}
-
-func (tr *trace) SetError() {
-	tr.mu.Lock()
-	tr.IsError = true
-	tr.mu.Unlock()
-}
-
-func (tr *trace) SetRecycler(f func(interface{})) {
-	tr.mu.Lock()
-	tr.recycler = f
-	tr.mu.Unlock()
-}
-
-func (tr *trace) SetTraceInfo(traceID, spanID uint64) {
-	tr.mu.Lock()
-	tr.traceID, tr.spanID = traceID, spanID
-	tr.mu.Unlock()
-}
-
-func (tr *trace) SetMaxEvents(m int) {
-	tr.mu.Lock()
-	// Always keep at least three events: first, discarded count, last.
-	if len(tr.events) == 0 && m > 3 {
-		tr.maxEvents = m
-	}
-	tr.mu.Unlock()
-}
-
-func (tr *trace) ref() {
-	atomic.AddInt32(&tr.refs, 1)
-}
-
-func (tr *trace) unref() {
-	if atomic.AddInt32(&tr.refs, -1) == 0 {
-		tr.mu.RLock()
-		if tr.recycler != nil {
-			// freeTrace clears tr, so we hold tr.recycler and tr.events here.
-			go func(f func(interface{}), es []event) {
-				for _, e := range es {
-					if e.Recyclable {
-						f(e.What)
-					}
-				}
-			}(tr.recycler, tr.events)
-		}
-		tr.mu.RUnlock()
-
-		freeTrace(tr)
-	}
-}
-
-func (tr *trace) When() string {
-	return tr.Start.Format("2006/01/02 15:04:05.000000")
-}
-
-func (tr *trace) ElapsedTime() string {
-	tr.mu.RLock()
-	t := tr.Elapsed
-	tr.mu.RUnlock()
-
-	if t == 0 {
-		// Active trace.
-		t = time.Since(tr.Start)
-	}
-	return fmt.Sprintf("%.6f", t.Seconds())
-}
-
-func (tr *trace) Events() []event {
-	tr.mu.RLock()
-	defer tr.mu.RUnlock()
-	return tr.events
-}
-
-var traceFreeList = make(chan *trace, 1000) // TODO(dsymonds): Use sync.Pool?
-
-// newTrace returns a trace ready to use.
-func newTrace() *trace {
-	select {
-	case tr := <-traceFreeList:
-		return tr
-	default:
-		return new(trace)
-	}
-}
-
-// freeTrace adds tr to traceFreeList if there's room.
-// This is non-blocking.
-func freeTrace(tr *trace) {
-	if DebugUseAfterFinish {
-		return // never reuse
-	}
-	tr.reset()
-	select {
-	case traceFreeList <- tr:
-	default:
-	}
-}
-
-func elapsed(d time.Duration) string {
-	b := []byte(fmt.Sprintf("%.6f", d.Seconds()))
-
-	// For subsecond durations, blank all zeros before decimal point,
-	// and all zeros between the decimal point and the first non-zero digit.
-	if d < time.Second {
-		dot := bytes.IndexByte(b, '.')
-		for i := 0; i < dot; i++ {
-			b[i] = ' '
-		}
-		for i := dot + 1; i < len(b); i++ {
-			if b[i] == '0' {
-				b[i] = ' '
-			} else {
-				break
-			}
-		}
-	}
-
-	return string(b)
-}
-
-var pageTmplCache *template.Template
-var pageTmplOnce sync.Once
-
-func pageTmpl() *template.Template {
-	pageTmplOnce.Do(func() {
-		pageTmplCache = template.Must(template.New("Page").Funcs(template.FuncMap{
-			"elapsed": elapsed,
-			"add":     func(a, b int) int { return a + b },
-		}).Parse(pageHTML))
-	})
-	return pageTmplCache
-}
-
-const pageHTML = `
-{{template "Prolog" .}}
-{{template "StatusTable" .}}
-{{template "Epilog" .}}
-
-{{define "Prolog"}}
-<html>
-	<head>
-	<title>/debug/requests</title>
-	<style type="text/css">
-		body {
-			font-family: sans-serif;
-		}
-		table#tr-status td.family {
-			padding-right: 2em;
-		}
-		table#tr-status td.active {
-			padding-right: 1em;
-		}
-		table#tr-status td.latency-first {
-			padding-left: 1em;
-		}
-		table#tr-status td.empty {
-			color: #aaa;
-		}
-		table#reqs {
-			margin-top: 1em;
-		}
-		table#reqs tr.first {
-			{{if $.Expanded}}font-weight: bold;{{end}}
-		}
-		table#reqs td {
-			font-family: monospace;
-		}
-		table#reqs td.when {
-			text-align: right;
-			white-space: nowrap;
-		}
-		table#reqs td.elapsed {
-			padding: 0 0.5em;
-			text-align: right;
-			white-space: pre;
-			width: 10em;
-		}
-		address {
-			font-size: smaller;
-			margin-top: 5em;
-		}
-	</style>
-	</head>
-	<body>
-
-<h1>/debug/requests</h1>
-{{end}} {{/* end of Prolog */}}
-
-{{define "StatusTable"}}
-<table id="tr-status">
-	{{range $fam := .Families}}
-	<tr>
-		<td class="family">{{$fam}}</td>
-
-		{{$n := index $.ActiveTraceCount $fam}}
-		<td class="active {{if not $n}}empty{{end}}">
-			{{if $n}}<a href="?fam={{$fam}}&b=-1{{if $.Expanded}}&exp=1{{end}}">{{end}}
-			[{{$n}} active]
-			{{if $n}}</a>{{end}}
-		</td>
-
-		{{$f := index $.CompletedTraces $fam}}
-		{{range $i, $b := $f.Buckets}}
-		{{$empty := $b.Empty}}
-		<td {{if $empty}}class="empty"{{end}}>
-		{{if not $empty}}<a href="?fam={{$fam}}&b={{$i}}{{if $.Expanded}}&exp=1{{end}}">{{end}}
-		[{{.Cond}}]
-		{{if not $empty}}</a>{{end}}
-		</td>
-		{{end}}
-
-		{{$nb := len $f.Buckets}}
-		<td class="latency-first">
-		<a href="?fam={{$fam}}&b={{$nb}}">[minute]</a>
-		</td>
-		<td>
-		<a href="?fam={{$fam}}&b={{add $nb 1}}">[hour]</a>
-		</td>
-		<td>
-		<a href="?fam={{$fam}}&b={{add $nb 2}}">[total]</a>
-		</td>
-
-	</tr>
-	{{end}}
-</table>
-{{end}} {{/* end of StatusTable */}}
-
-{{define "Epilog"}}
-{{if $.Traces}}
-<hr />
-<h3>Family: {{$.Family}}</h3>
-
-{{if or $.Expanded $.Traced}}
-  <a href="?fam={{$.Family}}&b={{$.Bucket}}">[Normal/Summary]</a>
-{{else}}
-  [Normal/Summary]
-{{end}}
-
-{{if or (not $.Expanded) $.Traced}}
-  <a href="?fam={{$.Family}}&b={{$.Bucket}}&exp=1">[Normal/Expanded]</a>
-{{else}}
-  [Normal/Expanded]
-{{end}}
-
-{{if not $.Active}}
-	{{if or $.Expanded (not $.Traced)}}
-	<a href="?fam={{$.Family}}&b={{$.Bucket}}&rtraced=1">[Traced/Summary]</a>
-	{{else}}
-	[Traced/Summary]
-	{{end}}
-	{{if or (not $.Expanded) (not $.Traced)}}
-	<a href="?fam={{$.Family}}&b={{$.Bucket}}&exp=1&rtraced=1">[Traced/Expanded]</a>
-        {{else}}
-	[Traced/Expanded]
-	{{end}}
-{{end}}
-
-{{if $.Total}}
-<p><em>Showing <b>{{len $.Traces}}</b> of <b>{{$.Total}}</b> traces.</em></p>
-{{end}}
-
-<table id="reqs">
-	<caption>
-		{{if $.Active}}Active{{else}}Completed{{end}} Requests
-	</caption>
-	<tr><th>When</th><th>Elapsed&nbsp;(s)</th></tr>
-	{{range $tr := $.Traces}}
-	<tr class="first">
-		<td class="when">{{$tr.When}}</td>
-		<td class="elapsed">{{$tr.ElapsedTime}}</td>
-		<td>{{$tr.Title}}</td>
-		{{/* TODO: include traceID/spanID */}}
-	</tr>
-	{{if $.Expanded}}
-	{{range $tr.Events}}
-	<tr>
-		<td class="when">{{.WhenString}}</td>
-		<td class="elapsed">{{elapsed .Elapsed}}</td>
-		<td>{{if or $.ShowSensitive (not .Sensitive)}}... {{.What}}{{else}}<em>[redacted]</em>{{end}}</td>
-	</tr>
-	{{end}}
-	{{end}}
-	{{end}}
-</table>
-{{end}} {{/* if $.Traces */}}
-
-{{if $.Histogram}}
-<h4>Latency (&micro;s) of {{$.Family}} over {{$.HistogramWindow}}</h4>
-{{$.Histogram}}
-{{end}} {{/* if $.Histogram */}}
-
-	</body>
-</html>
-{{end}} {{/* end of Epilog */}}
-`