Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

3 files changed, 1976 insertions, 0 deletions

diff --git a/vendor/golang.org/x/net/trace/events.go b/vendor/golang.org/x/net/trace/events.go
new file mode 100644
index 000000000..d8daec1a7
--- /dev/null
+++ b/vendor/golang.org/x/net/trace/events.go
@@ -0,0 +1,532 @@
+// 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; see AuthRequest for the default auth check
+// used by the handler registered on http.DefaultServeMux.
+// req may be nil.
+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
new file mode 100644
index 000000000..9bf4286c7
--- /dev/null
+++ b/vendor/golang.org/x/net/trace/histogram.go
@@ -0,0 +1,365 @@
+// 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
new file mode 100644
index 000000000..64f56a373
--- /dev/null
+++ b/vendor/golang.org/x/net/trace/trace.go
@@ -0,0 +1,1079 @@
+// 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"
+	"fmt"
+	"html/template"
+	"io"
+	"log"
+	"net"
+	"net/http"
+	"runtime"
+	"sort"
+	"strconv"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"golang.org/x/net/context"
+	"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
+
+// 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() {
+	http.HandleFunc("/debug/requests", func(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)
+	})
+	http.HandleFunc("/debug/events", func(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; see AuthRequest for the default auth check
+// used by the handler registered on http.DefaultServeMux.
+// req may be nil.
+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")
+
+// 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
+}
+
+// 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() {
+	tr.Elapsed = time.Now().Sub(tr.Start)
+	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)
+	for _, b := range f.Buckets {
+		if b.Cond.match(tr) {
+			b.Add(tr)
+		}
+	}
+	// Add a sample of elapsed time as microseconds to the family's timeseries
+	h := new(histogram)
+	h.addMeasurement(tr.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
+
+	// Timing information.
+	Start   time.Time
+	Elapsed time.Duration // zero while active
+
+	// Trace information if non-zero.
+	traceID uint64
+	spanID  uint64
+
+	// Whether this trace resulted in an error.
+	IsError bool
+
+	// Append-only sequence of events (modulo discards).
+	mu        sync.RWMutex
+	events    []event
+	maxEvents int
+
+	refs     int32 // how many buckets this is in
+	recycler func(interface{})
+	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.Elapsed = 0
+	tr.traceID = 0
+	tr.spanID = 0
+	tr.IsError = false
+	tr.maxEvents = 0
+	tr.events = nil
+	tr.refs = 0
+	tr.recycler = nil
+	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.IsError = true }
+
+func (tr *trace) SetRecycler(f func(interface{})) {
+	tr.recycler = f
+}
+
+func (tr *trace) SetTraceInfo(traceID, spanID uint64) {
+	tr.traceID, tr.spanID = traceID, spanID
+}
+
+func (tr *trace) SetMaxEvents(m int) {
+	// Always keep at least three events: first, discarded count, last.
+	if len(tr.events) == 0 && m > 3 {
+		tr.maxEvents = m
+	}
+}
+
+func (tr *trace) ref() {
+	atomic.AddInt32(&tr.refs, 1)
+}
+
+func (tr *trace) unref() {
+	if atomic.AddInt32(&tr.refs, -1) == 0 {
+		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)
+		}
+
+		freeTrace(tr)
+	}
+}
+
+func (tr *trace) When() string {
+	return tr.Start.Format("2006/01/02 15:04:05.000000")
+}
+
+func (tr *trace) ElapsedTime() string {
+	t := tr.Elapsed
+	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 */}}
+`