Depenancy upgrades and movign to dep. (#8630)

11 files changed, 29 insertions, 756 deletions

diff --git a/vendor/github.com/beorn7/perks/.gitignore b/vendor/github.com/beorn7/perks/.gitignore
deleted file mode 100644
index 1bd9209aa..000000000
--- a/vendor/github.com/beorn7/perks/.gitignore
+++ /dev/null
@@ -1,2 +0,0 @@
-*.test
-*.prof
diff --git a/vendor/github.com/beorn7/perks/README.md b/vendor/github.com/beorn7/perks/README.md
deleted file mode 100644
index fc0577770..000000000
--- a/vendor/github.com/beorn7/perks/README.md
+++ /dev/null
@@ -1,31 +0,0 @@
-# Perks for Go (golang.org)
-
-Perks contains the Go package quantile that computes approximate quantiles over
-an unbounded data stream within low memory and CPU bounds.
-
-For more information and examples, see:
-http://godoc.org/github.com/bmizerany/perks
-
-A very special thank you and shout out to Graham Cormode (Rutgers University),
-Flip Korn (AT&T Labs–Research), S. Muthukrishnan (Rutgers University), and
-Divesh Srivastava (AT&T Labs–Research) for their research and publication of
-[Effective Computation of Biased Quantiles over Data Streams](http://www.cs.rutgers.edu/~muthu/bquant.pdf)
-
-Thank you, also:
-* Armon Dadgar (@armon)
-* Andrew Gerrand (@nf)
-* Brad Fitzpatrick (@bradfitz)
-* Keith Rarick (@kr)
-
-FAQ:
-
-Q: Why not move the quantile package into the project root?
-A: I want to add more packages to perks later.
-
-Copyright (C) 2013 Blake Mizerany
-
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/vendor/github.com/beorn7/perks/histogram/bench_test.go b/vendor/github.com/beorn7/perks/histogram/bench_test.go
deleted file mode 100644
index 56c7e5516..000000000
--- a/vendor/github.com/beorn7/perks/histogram/bench_test.go
+++ /dev/null
@@ -1,26 +0,0 @@
-package histogram
-
-import (
-	"math/rand"
-	"testing"
-)
-
-func BenchmarkInsert10Bins(b *testing.B) {
-	b.StopTimer()
-	h := New(10)
-	b.StartTimer()
-	for i := 0; i < b.N; i++ {
-		f := rand.ExpFloat64()
-		h.Insert(f)
-	}
-}
-
-func BenchmarkInsert100Bins(b *testing.B) {
-	b.StopTimer()
-	h := New(100)
-	b.StartTimer()
-	for i := 0; i < b.N; i++ {
-		f := rand.ExpFloat64()
-		h.Insert(f)
-	}
-}
diff --git a/vendor/github.com/beorn7/perks/histogram/histogram.go b/vendor/github.com/beorn7/perks/histogram/histogram.go
deleted file mode 100644
index bef05c70c..000000000
--- a/vendor/github.com/beorn7/perks/histogram/histogram.go
+++ /dev/null
@@ -1,108 +0,0 @@
-// Package histogram provides a Go implementation of BigML's histogram package
-// for Clojure/Java. It is currently experimental.
-package histogram
-
-import (
-	"container/heap"
-	"math"
-	"sort"
-)
-
-type Bin struct {
-	Count int
-	Sum   float64
-}
-
-func (b *Bin) Update(x *Bin) {
-	b.Count += x.Count
-	b.Sum += x.Sum
-}
-
-func (b *Bin) Mean() float64 {
-	return b.Sum / float64(b.Count)
-}
-
-type Bins []*Bin
-
-func (bs Bins) Len() int           { return len(bs) }
-func (bs Bins) Less(i, j int) bool { return bs[i].Mean() < bs[j].Mean() }
-func (bs Bins) Swap(i, j int)      { bs[i], bs[j] = bs[j], bs[i] }
-
-func (bs *Bins) Push(x interface{}) {
-	*bs = append(*bs, x.(*Bin))
-}
-
-func (bs *Bins) Pop() interface{} {
-	return bs.remove(len(*bs) - 1)
-}
-
-func (bs *Bins) remove(n int) *Bin {
-	if n < 0 || len(*bs) < n {
-		return nil
-	}
-	x := (*bs)[n]
-	*bs = append((*bs)[:n], (*bs)[n+1:]...)
-	return x
-}
-
-type Histogram struct {
-	res *reservoir
-}
-
-func New(maxBins int) *Histogram {
-	return &Histogram{res: newReservoir(maxBins)}
-}
-
-func (h *Histogram) Insert(f float64) {
-	h.res.insert(&Bin{1, f})
-	h.res.compress()
-}
-
-func (h *Histogram) Bins() Bins {
-	return h.res.bins
-}
-
-type reservoir struct {
-	n       int
-	maxBins int
-	bins    Bins
-}
-
-func newReservoir(maxBins int) *reservoir {
-	return &reservoir{maxBins: maxBins}
-}
-
-func (r *reservoir) insert(bin *Bin) {
-	r.n += bin.Count
-	i := sort.Search(len(r.bins), func(i int) bool {
-		return r.bins[i].Mean() >= bin.Mean()
-	})
-	if i < 0 || i == r.bins.Len() {
-		// TODO(blake): Maybe use an .insert(i, bin) instead of
-		// performing the extra work of a heap.Push.
-		heap.Push(&r.bins, bin)
-		return
-	}
-	r.bins[i].Update(bin)
-}
-
-func (r *reservoir) compress() {
-	for r.bins.Len() > r.maxBins {
-		minGapIndex := -1
-		minGap := math.MaxFloat64
-		for i := 0; i < r.bins.Len()-1; i++ {
-			gap := gapWeight(r.bins[i], r.bins[i+1])
-			if minGap > gap {
-				minGap = gap
-				minGapIndex = i
-			}
-		}
-		prev := r.bins[minGapIndex]
-		next := r.bins.remove(minGapIndex + 1)
-		prev.Update(next)
-	}
-}
-
-func gapWeight(prev, next *Bin) float64 {
-	return next.Mean() - prev.Mean()
-}
diff --git a/vendor/github.com/beorn7/perks/histogram/histogram_test.go b/vendor/github.com/beorn7/perks/histogram/histogram_test.go
deleted file mode 100644
index 0575ebeee..000000000
--- a/vendor/github.com/beorn7/perks/histogram/histogram_test.go
+++ /dev/null
@@ -1,38 +0,0 @@
-package histogram
-
-import (
-	"math/rand"
-	"testing"
-)
-
-func TestHistogram(t *testing.T) {
-	const numPoints = 1e6
-	const maxBins = 3
-
-	h := New(maxBins)
-	for i := 0; i < numPoints; i++ {
-		f := rand.ExpFloat64()
-		h.Insert(f)
-	}
-
-	bins := h.Bins()
-	if g := len(bins); g > maxBins {
-		t.Fatalf("got %d bins, wanted <= %d", g, maxBins)
-	}
-
-	for _, b := range bins {
-		t.Logf("%+v", b)
-	}
-
-	if g := count(h.Bins()); g != numPoints {
-		t.Fatalf("binned %d points, wanted %d", g, numPoints)
-	}
-}
-
-func count(bins Bins) int {
-	binCounts := 0
-	for _, b := range bins {
-		binCounts += b.Count
-	}
-	return binCounts
-}
diff --git a/vendor/github.com/beorn7/perks/quantile/bench_test.go b/vendor/github.com/beorn7/perks/quantile/bench_test.go
deleted file mode 100644
index 0bd0e4e77..000000000
--- a/vendor/github.com/beorn7/perks/quantile/bench_test.go
+++ /dev/null
@@ -1,63 +0,0 @@
-package quantile
-
-import (
-	"testing"
-)
-
-func BenchmarkInsertTargeted(b *testing.B) {
-	b.ReportAllocs()
-
-	s := NewTargeted(Targets)
-	b.ResetTimer()
-	for i := float64(0); i < float64(b.N); i++ {
-		s.Insert(i)
-	}
-}
-
-func BenchmarkInsertTargetedSmallEpsilon(b *testing.B) {
-	s := NewTargeted(TargetsSmallEpsilon)
-	b.ResetTimer()
-	for i := float64(0); i < float64(b.N); i++ {
-		s.Insert(i)
-	}
-}
-
-func BenchmarkInsertBiased(b *testing.B) {
-	s := NewLowBiased(0.01)
-	b.ResetTimer()
-	for i := float64(0); i < float64(b.N); i++ {
-		s.Insert(i)
-	}
-}
-
-func BenchmarkInsertBiasedSmallEpsilon(b *testing.B) {
-	s := NewLowBiased(0.0001)
-	b.ResetTimer()
-	for i := float64(0); i < float64(b.N); i++ {
-		s.Insert(i)
-	}
-}
-
-func BenchmarkQuery(b *testing.B) {
-	s := NewTargeted(Targets)
-	for i := float64(0); i < 1e6; i++ {
-		s.Insert(i)
-	}
-	b.ResetTimer()
-	n := float64(b.N)
-	for i := float64(0); i < n; i++ {
-		s.Query(i / n)
-	}
-}
-
-func BenchmarkQuerySmallEpsilon(b *testing.B) {
-	s := NewTargeted(TargetsSmallEpsilon)
-	for i := float64(0); i < 1e6; i++ {
-		s.Insert(i)
-	}
-	b.ResetTimer()
-	n := float64(b.N)
-	for i := float64(0); i < n; i++ {
-		s.Query(i / n)
-	}
-}
diff --git a/vendor/github.com/beorn7/perks/quantile/example_test.go b/vendor/github.com/beorn7/perks/quantile/example_test.go
deleted file mode 100644
index ab3293aaf..000000000
--- a/vendor/github.com/beorn7/perks/quantile/example_test.go
+++ /dev/null
@@ -1,121 +0,0 @@
-// +build go1.1
-
-package quantile_test
-
-import (
-	"bufio"
-	"fmt"
-	"log"
-	"os"
-	"strconv"
-	"time"
-
-	"github.com/beorn7/perks/quantile"
-)
-
-func Example_simple() {
-	ch := make(chan float64)
-	go sendFloats(ch)
-
-	// Compute the 50th, 90th, and 99th percentile.
-	q := quantile.NewTargeted(map[float64]float64{
-		0.50: 0.005,
-		0.90: 0.001,
-		0.99: 0.0001,
-	})
-	for v := range ch {
-		q.Insert(v)
-	}
-
-	fmt.Println("perc50:", q.Query(0.50))
-	fmt.Println("perc90:", q.Query(0.90))
-	fmt.Println("perc99:", q.Query(0.99))
-	fmt.Println("count:", q.Count())
-	// Output:
-	// perc50: 5
-	// perc90: 16
-	// perc99: 223
-	// count: 2388
-}
-
-func Example_mergeMultipleStreams() {
-	// Scenario:
-	// We have multiple database shards. On each shard, there is a process
-	// collecting query response times from the database logs and inserting
-	// them into a Stream (created via NewTargeted(0.90)), much like the
-	// Simple example. These processes expose a network interface for us to
-	// ask them to serialize and send us the results of their
-	// Stream.Samples so we may Merge and Query them.
-	//
-	// NOTES:
-	// * These sample sets are small, allowing us to get them
-	// across the network much faster than sending the entire list of data
-	// points.
-	//
-	// * For this to work correctly, we must supply the same quantiles
-	// a priori the process collecting the samples supplied to NewTargeted,
-	// even if we do not plan to query them all here.
-	ch := make(chan quantile.Samples)
-	getDBQuerySamples(ch)
-	q := quantile.NewTargeted(map[float64]float64{0.90: 0.001})
-	for samples := range ch {
-		q.Merge(samples)
-	}
-	fmt.Println("perc90:", q.Query(0.90))
-}
-
-func Example_window() {
-	// Scenario: We want the 90th, 95th, and 99th percentiles for each
-	// minute.
-
-	ch := make(chan float64)
-	go sendStreamValues(ch)
-
-	tick := time.NewTicker(1 * time.Minute)
-	q := quantile.NewTargeted(map[float64]float64{
-		0.90: 0.001,
-		0.95: 0.0005,
-		0.99: 0.0001,
-	})
-	for {
-		select {
-		case t := <-tick.C:
-			flushToDB(t, q.Samples())
-			q.Reset()
-		case v := <-ch:
-			q.Insert(v)
-		}
-	}
-}
-
-func sendStreamValues(ch chan float64) {
-	// Use your imagination
-}
-
-func flushToDB(t time.Time, samples quantile.Samples) {
-	// Use your imagination
-}
-
-// This is a stub for the above example. In reality this would hit the remote
-// servers via http or something like it.
-func getDBQuerySamples(ch chan quantile.Samples) {}
-
-func sendFloats(ch chan<- float64) {
-	f, err := os.Open("exampledata.txt")
-	if err != nil {
-		log.Fatal(err)
-	}
-	sc := bufio.NewScanner(f)
-	for sc.Scan() {
-		b := sc.Bytes()
-		v, err := strconv.ParseFloat(string(b), 64)
-		if err != nil {
-			log.Fatal(err)
-		}
-		ch <- v
-	}
-	if sc.Err() != nil {
-		log.Fatal(sc.Err())
-	}
-	close(ch)
-}
diff --git a/vendor/github.com/beorn7/perks/quantile/stream.go b/vendor/github.com/beorn7/perks/quantile/stream.go
index f4cabd669..d7d14f8eb 100644
--- a/vendor/github.com/beorn7/perks/quantile/stream.go
+++ b/vendor/github.com/beorn7/perks/quantile/stream.go
@@ -77,15 +77,20 @@ func NewHighBiased(epsilon float64) *Stream {
 // is guaranteed to be within (Quantile±Epsilon).
 //
 // See http://www.cs.rutgers.edu/~muthu/bquant.pdf for time, space, and error properties.
-func NewTargeted(targets map[float64]float64) *Stream {
+func NewTargeted(targetMap map[float64]float64) *Stream {
+	// Convert map to slice to avoid slow iterations on a map.
+	// ƒ is called on the hot path, so converting the map to a slice
+	// beforehand results in significant CPU savings.
+	targets := targetMapToSlice(targetMap)
+
 	ƒ := func(s *stream, r float64) float64 {
 		var m = math.MaxFloat64
 		var f float64
-		for quantile, epsilon := range targets {
-			if quantile*s.n <= r {
-				f = (2 * epsilon * r) / quantile
+		for _, t := range targets {
+			if t.quantile*s.n <= r {
+				f = (2 * t.epsilon * r) / t.quantile
 			} else {
-				f = (2 * epsilon * (s.n - r)) / (1 - quantile)
+				f = (2 * t.epsilon * (s.n - r)) / (1 - t.quantile)
 			}
 			if f < m {
 				m = f
@@ -96,6 +101,25 @@ func NewTargeted(targets map[float64]float64) *Stream {
 	return newStream(ƒ)
 }
 
+type target struct {
+	quantile float64
+	epsilon  float64
+}
+
+func targetMapToSlice(targetMap map[float64]float64) []target {
+	targets := make([]target, 0, len(targetMap))
+
+	for quantile, epsilon := range targetMap {
+		t := target{
+			quantile: quantile,
+			epsilon:  epsilon,
+		}
+		targets = append(targets, t)
+	}
+
+	return targets
+}
+
 // Stream computes quantiles for a stream of float64s. It is not thread-safe by
 // design. Take care when using across multiple goroutines.
 type Stream struct {
diff --git a/vendor/github.com/beorn7/perks/quantile/stream_test.go b/vendor/github.com/beorn7/perks/quantile/stream_test.go
deleted file mode 100644
index 855195097..000000000
--- a/vendor/github.com/beorn7/perks/quantile/stream_test.go
+++ /dev/null
@@ -1,215 +0,0 @@
-package quantile
-
-import (
-	"math"
-	"math/rand"
-	"sort"
-	"testing"
-)
-
-var (
-	Targets = map[float64]float64{
-		0.01: 0.001,
-		0.10: 0.01,
-		0.50: 0.05,
-		0.90: 0.01,
-		0.99: 0.001,
-	}
-	TargetsSmallEpsilon = map[float64]float64{
-		0.01: 0.0001,
-		0.10: 0.001,
-		0.50: 0.005,
-		0.90: 0.001,
-		0.99: 0.0001,
-	}
-	LowQuantiles  = []float64{0.01, 0.1, 0.5}
-	HighQuantiles = []float64{0.99, 0.9, 0.5}
-)
-
-const RelativeEpsilon = 0.01
-
-func verifyPercsWithAbsoluteEpsilon(t *testing.T, a []float64, s *Stream) {
-	sort.Float64s(a)
-	for quantile, epsilon := range Targets {
-		n := float64(len(a))
-		k := int(quantile * n)
-		if k < 1 {
-			k = 1
-		}
-		lower := int((quantile - epsilon) * n)
-		if lower < 1 {
-			lower = 1
-		}
-		upper := int(math.Ceil((quantile + epsilon) * n))
-		if upper > len(a) {
-			upper = len(a)
-		}
-		w, min, max := a[k-1], a[lower-1], a[upper-1]
-		if g := s.Query(quantile); g < min || g > max {
-			t.Errorf("q=%f: want %v [%f,%f], got %v", quantile, w, min, max, g)
-		}
-	}
-}
-
-func verifyLowPercsWithRelativeEpsilon(t *testing.T, a []float64, s *Stream) {
-	sort.Float64s(a)
-	for _, qu := range LowQuantiles {
-		n := float64(len(a))
-		k := int(qu * n)
-
-		lowerRank := int((1 - RelativeEpsilon) * qu * n)
-		upperRank := int(math.Ceil((1 + RelativeEpsilon) * qu * n))
-		w, min, max := a[k-1], a[lowerRank-1], a[upperRank-1]
-		if g := s.Query(qu); g < min || g > max {
-			t.Errorf("q=%f: want %v [%f,%f], got %v", qu, w, min, max, g)
-		}
-	}
-}
-
-func verifyHighPercsWithRelativeEpsilon(t *testing.T, a []float64, s *Stream) {
-	sort.Float64s(a)
-	for _, qu := range HighQuantiles {
-		n := float64(len(a))
-		k := int(qu * n)
-
-		lowerRank := int((1 - (1+RelativeEpsilon)*(1-qu)) * n)
-		upperRank := int(math.Ceil((1 - (1-RelativeEpsilon)*(1-qu)) * n))
-		w, min, max := a[k-1], a[lowerRank-1], a[upperRank-1]
-		if g := s.Query(qu); g < min || g > max {
-			t.Errorf("q=%f: want %v [%f,%f], got %v", qu, w, min, max, g)
-		}
-	}
-}
-
-func populateStream(s *Stream) []float64 {
-	a := make([]float64, 0, 1e5+100)
-	for i := 0; i < cap(a); i++ {
-		v := rand.NormFloat64()
-		// Add 5% asymmetric outliers.
-		if i%20 == 0 {
-			v = v*v + 1
-		}
-		s.Insert(v)
-		a = append(a, v)
-	}
-	return a
-}
-
-func TestTargetedQuery(t *testing.T) {
-	rand.Seed(42)
-	s := NewTargeted(Targets)
-	a := populateStream(s)
-	verifyPercsWithAbsoluteEpsilon(t, a, s)
-}
-
-func TestTargetedQuerySmallSampleSize(t *testing.T) {
-	rand.Seed(42)
-	s := NewTargeted(TargetsSmallEpsilon)
-	a := []float64{1, 2, 3, 4, 5}
-	for _, v := range a {
-		s.Insert(v)
-	}
-	verifyPercsWithAbsoluteEpsilon(t, a, s)
-	// If not yet flushed, results should be precise:
-	if !s.flushed() {
-		for φ, want := range map[float64]float64{
-			0.01: 1,
-			0.10: 1,
-			0.50: 3,
-			0.90: 5,
-			0.99: 5,
-		} {
-			if got := s.Query(φ); got != want {
-				t.Errorf("want %f for φ=%f, got %f", want, φ, got)
-			}
-		}
-	}
-}
-
-func TestLowBiasedQuery(t *testing.T) {
-	rand.Seed(42)
-	s := NewLowBiased(RelativeEpsilon)
-	a := populateStream(s)
-	verifyLowPercsWithRelativeEpsilon(t, a, s)
-}
-
-func TestHighBiasedQuery(t *testing.T) {
-	rand.Seed(42)
-	s := NewHighBiased(RelativeEpsilon)
-	a := populateStream(s)
-	verifyHighPercsWithRelativeEpsilon(t, a, s)
-}
-
-// BrokenTestTargetedMerge is broken, see Merge doc comment.
-func BrokenTestTargetedMerge(t *testing.T) {
-	rand.Seed(42)
-	s1 := NewTargeted(Targets)
-	s2 := NewTargeted(Targets)
-	a := populateStream(s1)
-	a = append(a, populateStream(s2)...)
-	s1.Merge(s2.Samples())
-	verifyPercsWithAbsoluteEpsilon(t, a, s1)
-}
-
-// BrokenTestLowBiasedMerge is broken, see Merge doc comment.
-func BrokenTestLowBiasedMerge(t *testing.T) {
-	rand.Seed(42)
-	s1 := NewLowBiased(RelativeEpsilon)
-	s2 := NewLowBiased(RelativeEpsilon)
-	a := populateStream(s1)
-	a = append(a, populateStream(s2)...)
-	s1.Merge(s2.Samples())
-	verifyLowPercsWithRelativeEpsilon(t, a, s2)
-}
-
-// BrokenTestHighBiasedMerge is broken, see Merge doc comment.
-func BrokenTestHighBiasedMerge(t *testing.T) {
-	rand.Seed(42)
-	s1 := NewHighBiased(RelativeEpsilon)
-	s2 := NewHighBiased(RelativeEpsilon)
-	a := populateStream(s1)
-	a = append(a, populateStream(s2)...)
-	s1.Merge(s2.Samples())
-	verifyHighPercsWithRelativeEpsilon(t, a, s2)
-}
-
-func TestUncompressed(t *testing.T) {
-	q := NewTargeted(Targets)
-	for i := 100; i > 0; i-- {
-		q.Insert(float64(i))
-	}
-	if g := q.Count(); g != 100 {
-		t.Errorf("want count 100, got %d", g)
-	}
-	// Before compression, Query should have 100% accuracy.
-	for quantile := range Targets {
-		w := quantile * 100
-		if g := q.Query(quantile); g != w {
-			t.Errorf("want %f, got %f", w, g)
-		}
-	}
-}
-
-func TestUncompressedSamples(t *testing.T) {
-	q := NewTargeted(map[float64]float64{0.99: 0.001})
-	for i := 1; i <= 100; i++ {
-		q.Insert(float64(i))
-	}
-	if g := q.Samples().Len(); g != 100 {
-		t.Errorf("want count 100, got %d", g)
-	}
-}
-
-func TestUncompressedOne(t *testing.T) {
-	q := NewTargeted(map[float64]float64{0.99: 0.01})
-	q.Insert(3.14)
-	if g := q.Query(0.90); g != 3.14 {
-		t.Error("want PI, got", g)
-	}
-}
-
-func TestDefaults(t *testing.T) {
-	if g := NewTargeted(map[float64]float64{0.99: 0.001}).Query(0.99); g != 0 {
-		t.Errorf("want 0, got %f", g)
-	}
-}
diff --git a/vendor/github.com/beorn7/perks/topk/topk.go b/vendor/github.com/beorn7/perks/topk/topk.go
deleted file mode 100644
index 5ac3d9904..000000000
--- a/vendor/github.com/beorn7/perks/topk/topk.go
+++ /dev/null
@@ -1,90 +0,0 @@
-package topk
-
-import (
-	"sort"
-)
-
-// http://www.cs.ucsb.edu/research/tech_reports/reports/2005-23.pdf
-
-type Element struct {
-	Value string
-	Count int
-}
-
-type Samples []*Element
-
-func (sm Samples) Len() int {
-	return len(sm)
-}
-
-func (sm Samples) Less(i, j int) bool {
-	return sm[i].Count < sm[j].Count
-}
-
-func (sm Samples) Swap(i, j int) {
-	sm[i], sm[j] = sm[j], sm[i]
-}
-
-type Stream struct {
-	k   int
-	mon map[string]*Element
-
-	// the minimum Element
-	min *Element
-}
-
-func New(k int) *Stream {
-	s := new(Stream)
-	s.k = k
-	s.mon = make(map[string]*Element)
-	s.min = &Element{}
-
-	// Track k+1 so that less frequenet items contended for that spot,
-	// resulting in k being more accurate.
-	return s
-}
-
-func (s *Stream) Insert(x string) {
-	s.insert(&Element{x, 1})
-}
-
-func (s *Stream) Merge(sm Samples) {
-	for _, e := range sm {
-		s.insert(e)
-	}
-}
-
-func (s *Stream) insert(in *Element) {
-	e := s.mon[in.Value]
-	if e != nil {
-		e.Count++
-	} else {
-		if len(s.mon) < s.k+1 {
-			e = &Element{in.Value, in.Count}
-			s.mon[in.Value] = e
-		} else {
-			e = s.min
-			delete(s.mon, e.Value)
-			e.Value = in.Value
-			e.Count += in.Count
-			s.min = e
-		}
-	}
-	if e.Count < s.min.Count {
-		s.min = e
-	}
-}
-
-func (s *Stream) Query() Samples {
-	var sm Samples
-	for _, e := range s.mon {
-		sm = append(sm, e)
-	}
-	sort.Sort(sort.Reverse(sm))
-
-	if len(sm) < s.k {
-		return sm
-	}
-
-	return sm[:s.k]
-}
diff --git a/vendor/github.com/beorn7/perks/topk/topk_test.go b/vendor/github.com/beorn7/perks/topk/topk_test.go
deleted file mode 100644
index c24f0f727..000000000
--- a/vendor/github.com/beorn7/perks/topk/topk_test.go
+++ /dev/null
@@ -1,57 +0,0 @@
-package topk
-
-import (
-	"fmt"
-	"math/rand"
-	"sort"
-	"testing"
-)
-
-func TestTopK(t *testing.T) {
-	stream := New(10)
-	ss := []*Stream{New(10), New(10), New(10)}
-	m := make(map[string]int)
-	for _, s := range ss {
-		for i := 0; i < 1e6; i++ {
-			v := fmt.Sprintf("%x", int8(rand.ExpFloat64()))
-			s.Insert(v)
-			m[v]++
-		}
-		stream.Merge(s.Query())
-	}
-
-	var sm Samples
-	for x, s := range m {
-		sm = append(sm, &Element{x, s})
-	}
-	sort.Sort(sort.Reverse(sm))
-
-	g := stream.Query()
-	if len(g) != 10 {
-		t.Fatalf("got %d, want 10", len(g))
-	}
-	for i, e := range g {
-		if sm[i].Value != e.Value {
-			t.Errorf("at %d: want %q, got %q", i, sm[i].Value, e.Value)
-		}
-	}
-}
-
-func TestQuery(t *testing.T) {
-	queryTests := []struct {
-		value string
-		expected int
-	}{
-		{"a", 1},
-		{"b", 2},
-		{"c", 2},
-	}
-
-	stream := New(2)
-	for _, tt := range queryTests {
-		stream.Insert(tt.value)
-		if n := len(stream.Query()); n != tt.expected {
-			t.Errorf("want %d, got %d", tt.expected, n)
-		}
-	}
-}