Update vendor for next release (#1343)

25 files changed, 1094 insertions, 421 deletions

diff --git a/vendor/go.uber.org/atomic/.codecov.yml b/vendor/go.uber.org/atomic/.codecov.yml
index 6d4d1be7..571116cc 100644
--- a/vendor/go.uber.org/atomic/.codecov.yml
+++ b/vendor/go.uber.org/atomic/.codecov.yml
@@ -13,3 +13,7 @@ coverage:
         if_not_found: success  # if parent is not found report status as success, error, or failure
         if_ci_failed: error    # if ci fails report status as success, error, or failure
 
+# Also update COVER_IGNORE_PKGS in the Makefile.
+ignore:
+  - /internal/gen-atomicint/
+  - /internal/gen-valuewrapper/
diff --git a/vendor/go.uber.org/atomic/.travis.yml b/vendor/go.uber.org/atomic/.travis.yml
index 4e73268b..13d0a4f2 100644
--- a/vendor/go.uber.org/atomic/.travis.yml
+++ b/vendor/go.uber.org/atomic/.travis.yml
@@ -8,8 +8,8 @@ env:
 
 matrix:
   include:
-  - go: 1.12.x
-  - go: 1.13.x
+  - go: oldstable
+  - go: stable
     env: LINT=1
 
 cache:
diff --git a/vendor/go.uber.org/atomic/CHANGELOG.md b/vendor/go.uber.org/atomic/CHANGELOG.md
index aef8b6eb..24c0274d 100644
--- a/vendor/go.uber.org/atomic/CHANGELOG.md
+++ b/vendor/go.uber.org/atomic/CHANGELOG.md
@@ -4,6 +4,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.7.0] - 2020-09-14
+### Added
+- Support JSON serialization and deserialization of primitive atomic types.
+- Support Text marshalling and unmarshalling for string atomics.
+
+### Changed
+- Disallow incorrect comparison of atomic values in a non-atomic way.
+
+### Removed
+- Remove dependency on `golang.org/x/{lint, tools}`.
+
 ## [1.6.0] - 2020-02-24
 ### Changed
 - Drop library dependency on `golang.org/x/{lint, tools}`.
@@ -52,6 +63,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial release.
 
+[1.7.0]: https://github.com/uber-go/atomic/compare/v1.6.0...v1.7.0
 [1.6.0]: https://github.com/uber-go/atomic/compare/v1.5.1...v1.6.0
 [1.5.1]: https://github.com/uber-go/atomic/compare/v1.5.0...v1.5.1
 [1.5.0]: https://github.com/uber-go/atomic/compare/v1.4.0...v1.5.0
diff --git a/vendor/go.uber.org/atomic/Makefile b/vendor/go.uber.org/atomic/Makefile
index 39af0fb6..1b1376d4 100644
--- a/vendor/go.uber.org/atomic/Makefile
+++ b/vendor/go.uber.org/atomic/Makefile
@@ -2,8 +2,16 @@
 export GOBIN ?= $(shell pwd)/bin
 
 GOLINT = $(GOBIN)/golint
+GEN_ATOMICINT = $(GOBIN)/gen-atomicint
+GEN_ATOMICWRAPPER = $(GOBIN)/gen-atomicwrapper
+STATICCHECK = $(GOBIN)/staticcheck
 
-GO_FILES ?= *.go
+GO_FILES ?= $(shell find . '(' -path .git -o -path vendor ')' -prune -o -name '*.go' -print)
+
+# Also update ignore section in .codecov.yml.
+COVER_IGNORE_PKGS = \
+	go.uber.org/atomic/internal/gen-atomicint \
+	go.uber.org/atomic/internal/gen-atomicwrapper
 
 .PHONY: build
 build:
@@ -20,16 +28,51 @@ gofmt:
 	@[ ! -s "$(FMT_LOG)" ] || (echo "gofmt failed:" && cat $(FMT_LOG) && false)
 
 $(GOLINT):
-	go install golang.org/x/lint/golint
+	cd tools && go install golang.org/x/lint/golint
+
+$(STATICCHECK):
+	cd tools && go install honnef.co/go/tools/cmd/staticcheck
+
+$(GEN_ATOMICWRAPPER): $(wildcard ./internal/gen-atomicwrapper/*)
+	go build -o $@ ./internal/gen-atomicwrapper
+
+$(GEN_ATOMICINT): $(wildcard ./internal/gen-atomicint/*)
+	go build -o $@ ./internal/gen-atomicint
 
 .PHONY: golint
 golint: $(GOLINT)
 	$(GOLINT) ./...
 
+.PHONY: staticcheck
+staticcheck: $(STATICCHECK)
+	$(STATICCHECK) ./...
+
 .PHONY: lint
-lint: gofmt golint
+lint: gofmt golint staticcheck generatenodirty
+
+# comma separated list of packages to consider for code coverage.
+COVER_PKG = $(shell \
+	go list -find ./... | \
+	grep -v $(foreach pkg,$(COVER_IGNORE_PKGS),-e "^$(pkg)$$") | \
+	paste -sd, -)
 
 .PHONY: cover
 cover:
-	go test -coverprofile=cover.out -coverpkg ./... -v ./...
+	go test -coverprofile=cover.out -coverpkg  $(COVER_PKG) -v ./...
 	go tool cover -html=cover.out -o cover.html
+
+.PHONY: generate
+generate: $(GEN_ATOMICINT) $(GEN_ATOMICWRAPPER)
+	go generate ./...
+
+.PHONY: generatenodirty
+generatenodirty:
+	@[ -z "$$(git status --porcelain)" ] || ( \
+		echo "Working tree is dirty. Commit your changes first."; \
+		exit 1 )
+	@make generate
+	@status=$$(git status --porcelain); \
+		[ -z "$$status" ] || ( \
+		echo "Working tree is dirty after `make generate`:"; \
+		echo "$$status"; \
+		echo "Please ensure that the generated code is up-to-date." )
diff --git a/vendor/go.uber.org/atomic/atomic.go b/vendor/go.uber.org/atomic/atomic.go
deleted file mode 100644
index ad5fa098..00000000
--- a/vendor/go.uber.org/atomic/atomic.go
+++ /dev/null
@@ -1,356 +0,0 @@
-// Copyright (c) 2016 Uber Technologies, Inc.
-//
-// 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.
-
-// Package atomic provides simple wrappers around numerics to enforce atomic
-// access.
-package atomic
-
-import (
-	"math"
-	"sync/atomic"
-	"time"
-)
-
-// Int32 is an atomic wrapper around an int32.
-type Int32 struct{ v int32 }
-
-// NewInt32 creates an Int32.
-func NewInt32(i int32) *Int32 {
-	return &Int32{i}
-}
-
-// Load atomically loads the wrapped value.
-func (i *Int32) Load() int32 {
-	return atomic.LoadInt32(&i.v)
-}
-
-// Add atomically adds to the wrapped int32 and returns the new value.
-func (i *Int32) Add(n int32) int32 {
-	return atomic.AddInt32(&i.v, n)
-}
-
-// Sub atomically subtracts from the wrapped int32 and returns the new value.
-func (i *Int32) Sub(n int32) int32 {
-	return atomic.AddInt32(&i.v, -n)
-}
-
-// Inc atomically increments the wrapped int32 and returns the new value.
-func (i *Int32) Inc() int32 {
-	return i.Add(1)
-}
-
-// Dec atomically decrements the wrapped int32 and returns the new value.
-func (i *Int32) Dec() int32 {
-	return i.Sub(1)
-}
-
-// CAS is an atomic compare-and-swap.
-func (i *Int32) CAS(old, new int32) bool {
-	return atomic.CompareAndSwapInt32(&i.v, old, new)
-}
-
-// Store atomically stores the passed value.
-func (i *Int32) Store(n int32) {
-	atomic.StoreInt32(&i.v, n)
-}
-
-// Swap atomically swaps the wrapped int32 and returns the old value.
-func (i *Int32) Swap(n int32) int32 {
-	return atomic.SwapInt32(&i.v, n)
-}
-
-// Int64 is an atomic wrapper around an int64.
-type Int64 struct{ v int64 }
-
-// NewInt64 creates an Int64.
-func NewInt64(i int64) *Int64 {
-	return &Int64{i}
-}
-
-// Load atomically loads the wrapped value.
-func (i *Int64) Load() int64 {
-	return atomic.LoadInt64(&i.v)
-}
-
-// Add atomically adds to the wrapped int64 and returns the new value.
-func (i *Int64) Add(n int64) int64 {
-	return atomic.AddInt64(&i.v, n)
-}
-
-// Sub atomically subtracts from the wrapped int64 and returns the new value.
-func (i *Int64) Sub(n int64) int64 {
-	return atomic.AddInt64(&i.v, -n)
-}
-
-// Inc atomically increments the wrapped int64 and returns the new value.
-func (i *Int64) Inc() int64 {
-	return i.Add(1)
-}
-
-// Dec atomically decrements the wrapped int64 and returns the new value.
-func (i *Int64) Dec() int64 {
-	return i.Sub(1)
-}
-
-// CAS is an atomic compare-and-swap.
-func (i *Int64) CAS(old, new int64) bool {
-	return atomic.CompareAndSwapInt64(&i.v, old, new)
-}
-
-// Store atomically stores the passed value.
-func (i *Int64) Store(n int64) {
-	atomic.StoreInt64(&i.v, n)
-}
-
-// Swap atomically swaps the wrapped int64 and returns the old value.
-func (i *Int64) Swap(n int64) int64 {
-	return atomic.SwapInt64(&i.v, n)
-}
-
-// Uint32 is an atomic wrapper around an uint32.
-type Uint32 struct{ v uint32 }
-
-// NewUint32 creates a Uint32.
-func NewUint32(i uint32) *Uint32 {
-	return &Uint32{i}
-}
-
-// Load atomically loads the wrapped value.
-func (i *Uint32) Load() uint32 {
-	return atomic.LoadUint32(&i.v)
-}
-
-// Add atomically adds to the wrapped uint32 and returns the new value.
-func (i *Uint32) Add(n uint32) uint32 {
-	return atomic.AddUint32(&i.v, n)
-}
-
-// Sub atomically subtracts from the wrapped uint32 and returns the new value.
-func (i *Uint32) Sub(n uint32) uint32 {
-	return atomic.AddUint32(&i.v, ^(n - 1))
-}
-
-// Inc atomically increments the wrapped uint32 and returns the new value.
-func (i *Uint32) Inc() uint32 {
-	return i.Add(1)
-}
-
-// Dec atomically decrements the wrapped int32 and returns the new value.
-func (i *Uint32) Dec() uint32 {
-	return i.Sub(1)
-}
-
-// CAS is an atomic compare-and-swap.
-func (i *Uint32) CAS(old, new uint32) bool {
-	return atomic.CompareAndSwapUint32(&i.v, old, new)
-}
-
-// Store atomically stores the passed value.
-func (i *Uint32) Store(n uint32) {
-	atomic.StoreUint32(&i.v, n)
-}
-
-// Swap atomically swaps the wrapped uint32 and returns the old value.
-func (i *Uint32) Swap(n uint32) uint32 {
-	return atomic.SwapUint32(&i.v, n)
-}
-
-// Uint64 is an atomic wrapper around a uint64.
-type Uint64 struct{ v uint64 }
-
-// NewUint64 creates a Uint64.
-func NewUint64(i uint64) *Uint64 {
-	return &Uint64{i}
-}
-
-// Load atomically loads the wrapped value.
-func (i *Uint64) Load() uint64 {
-	return atomic.LoadUint64(&i.v)
-}
-
-// Add atomically adds to the wrapped uint64 and returns the new value.
-func (i *Uint64) Add(n uint64) uint64 {
-	return atomic.AddUint64(&i.v, n)
-}
-
-// Sub atomically subtracts from the wrapped uint64 and returns the new value.
-func (i *Uint64) Sub(n uint64) uint64 {
-	return atomic.AddUint64(&i.v, ^(n - 1))
-}
-
-// Inc atomically increments the wrapped uint64 and returns the new value.
-func (i *Uint64) Inc() uint64 {
-	return i.Add(1)
-}
-
-// Dec atomically decrements the wrapped uint64 and returns the new value.
-func (i *Uint64) Dec() uint64 {
-	return i.Sub(1)
-}
-
-// CAS is an atomic compare-and-swap.
-func (i *Uint64) CAS(old, new uint64) bool {
-	return atomic.CompareAndSwapUint64(&i.v, old, new)
-}
-
-// Store atomically stores the passed value.
-func (i *Uint64) Store(n uint64) {
-	atomic.StoreUint64(&i.v, n)
-}
-
-// Swap atomically swaps the wrapped uint64 and returns the old value.
-func (i *Uint64) Swap(n uint64) uint64 {
-	return atomic.SwapUint64(&i.v, n)
-}
-
-// Bool is an atomic Boolean.
-type Bool struct{ v uint32 }
-
-// NewBool creates a Bool.
-func NewBool(initial bool) *Bool {
-	return &Bool{boolToInt(initial)}
-}
-
-// Load atomically loads the Boolean.
-func (b *Bool) Load() bool {
-	return truthy(atomic.LoadUint32(&b.v))
-}
-
-// CAS is an atomic compare-and-swap.
-func (b *Bool) CAS(old, new bool) bool {
-	return atomic.CompareAndSwapUint32(&b.v, boolToInt(old), boolToInt(new))
-}
-
-// Store atomically stores the passed value.
-func (b *Bool) Store(new bool) {
-	atomic.StoreUint32(&b.v, boolToInt(new))
-}
-
-// Swap sets the given value and returns the previous value.
-func (b *Bool) Swap(new bool) bool {
-	return truthy(atomic.SwapUint32(&b.v, boolToInt(new)))
-}
-
-// Toggle atomically negates the Boolean and returns the previous value.
-func (b *Bool) Toggle() bool {
-	for {
-		old := b.Load()
-		if b.CAS(old, !old) {
-			return old
-		}
-	}
-}
-
-func truthy(n uint32) bool {
-	return n == 1
-}
-
-func boolToInt(b bool) uint32 {
-	if b {
-		return 1
-	}
-	return 0
-}
-
-// Float64 is an atomic wrapper around float64.
-type Float64 struct {
-	v uint64
-}
-
-// NewFloat64 creates a Float64.
-func NewFloat64(f float64) *Float64 {
-	return &Float64{math.Float64bits(f)}
-}
-
-// Load atomically loads the wrapped value.
-func (f *Float64) Load() float64 {
-	return math.Float64frombits(atomic.LoadUint64(&f.v))
-}
-
-// Store atomically stores the passed value.
-func (f *Float64) Store(s float64) {
-	atomic.StoreUint64(&f.v, math.Float64bits(s))
-}
-
-// Add atomically adds to the wrapped float64 and returns the new value.
-func (f *Float64) Add(s float64) float64 {
-	for {
-		old := f.Load()
-		new := old + s
-		if f.CAS(old, new) {
-			return new
-		}
-	}
-}
-
-// Sub atomically subtracts from the wrapped float64 and returns the new value.
-func (f *Float64) Sub(s float64) float64 {
-	return f.Add(-s)
-}
-
-// CAS is an atomic compare-and-swap.
-func (f *Float64) CAS(old, new float64) bool {
-	return atomic.CompareAndSwapUint64(&f.v, math.Float64bits(old), math.Float64bits(new))
-}
-
-// Duration is an atomic wrapper around time.Duration
-// https://godoc.org/time#Duration
-type Duration struct {
-	v Int64
-}
-
-// NewDuration creates a Duration.
-func NewDuration(d time.Duration) *Duration {
-	return &Duration{v: *NewInt64(int64(d))}
-}
-
-// Load atomically loads the wrapped value.
-func (d *Duration) Load() time.Duration {
-	return time.Duration(d.v.Load())
-}
-
-// Store atomically stores the passed value.
-func (d *Duration) Store(n time.Duration) {
-	d.v.Store(int64(n))
-}
-
-// Add atomically adds to the wrapped time.Duration and returns the new value.
-func (d *Duration) Add(n time.Duration) time.Duration {
-	return time.Duration(d.v.Add(int64(n)))
-}
-
-// Sub atomically subtracts from the wrapped time.Duration and returns the new value.
-func (d *Duration) Sub(n time.Duration) time.Duration {
-	return time.Duration(d.v.Sub(int64(n)))
-}
-
-// Swap atomically swaps the wrapped time.Duration and returns the old value.
-func (d *Duration) Swap(n time.Duration) time.Duration {
-	return time.Duration(d.v.Swap(int64(n)))
-}
-
-// CAS is an atomic compare-and-swap.
-func (d *Duration) CAS(old, new time.Duration) bool {
-	return d.v.CAS(int64(old), int64(new))
-}
-
-// Value shadows the type of the same name from sync/atomic
-// https://godoc.org/sync/atomic#Value
-type Value struct{ atomic.Value }
diff --git a/vendor/go.uber.org/atomic/bool.go b/vendor/go.uber.org/atomic/bool.go
new file mode 100644
index 00000000..9cf1914b
--- /dev/null
+++ b/vendor/go.uber.org/atomic/bool.go
@@ -0,0 +1,81 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"encoding/json"
+)
+
+// Bool is an atomic type-safe wrapper for bool values.
+type Bool struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Uint32
+}
+
+var _zeroBool bool
+
+// NewBool creates a new Bool.
+func NewBool(v bool) *Bool {
+	x := &Bool{}
+	if v != _zeroBool {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped bool.
+func (x *Bool) Load() bool {
+	return truthy(x.v.Load())
+}
+
+// Store atomically stores the passed bool.
+func (x *Bool) Store(v bool) {
+	x.v.Store(boolToInt(v))
+}
+
+// CAS is an atomic compare-and-swap for bool values.
+func (x *Bool) CAS(o, n bool) bool {
+	return x.v.CAS(boolToInt(o), boolToInt(n))
+}
+
+// Swap atomically stores the given bool and returns the old
+// value.
+func (x *Bool) Swap(o bool) bool {
+	return truthy(x.v.Swap(boolToInt(o)))
+}
+
+// MarshalJSON encodes the wrapped bool into JSON.
+func (x *Bool) MarshalJSON() ([]byte, error) {
+	return json.Marshal(x.Load())
+}
+
+// UnmarshalJSON decodes a bool from JSON.
+func (x *Bool) UnmarshalJSON(b []byte) error {
+	var v bool
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	x.Store(v)
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/bool_ext.go b/vendor/go.uber.org/atomic/bool_ext.go
new file mode 100644
index 00000000..c7bf7a82
--- /dev/null
+++ b/vendor/go.uber.org/atomic/bool_ext.go
@@ -0,0 +1,53 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"strconv"
+)
+
+//go:generate bin/gen-atomicwrapper -name=Bool -type=bool -wrapped=Uint32 -pack=boolToInt -unpack=truthy -cas -swap -json -file=bool.go
+
+func truthy(n uint32) bool {
+	return n == 1
+}
+
+func boolToInt(b bool) uint32 {
+	if b {
+		return 1
+	}
+	return 0
+}
+
+// Toggle atomically negates the Boolean and returns the previous value.
+func (b *Bool) Toggle() bool {
+	for {
+		old := b.Load()
+		if b.CAS(old, !old) {
+			return old
+		}
+	}
+}
+
+// String encodes the wrapped value as a string.
+func (b *Bool) String() string {
+	return strconv.FormatBool(b.Load())
+}
diff --git a/vendor/go.uber.org/atomic/doc.go b/vendor/go.uber.org/atomic/doc.go
new file mode 100644
index 00000000..ae7390ee
--- /dev/null
+++ b/vendor/go.uber.org/atomic/doc.go
@@ -0,0 +1,23 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+// Package atomic provides simple wrappers around numerics to enforce atomic
+// access.
+package atomic
diff --git a/vendor/go.uber.org/atomic/duration.go b/vendor/go.uber.org/atomic/duration.go
new file mode 100644
index 00000000..027cfcb2
--- /dev/null
+++ b/vendor/go.uber.org/atomic/duration.go
@@ -0,0 +1,82 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"encoding/json"
+	"time"
+)
+
+// Duration is an atomic type-safe wrapper for time.Duration values.
+type Duration struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Int64
+}
+
+var _zeroDuration time.Duration
+
+// NewDuration creates a new Duration.
+func NewDuration(v time.Duration) *Duration {
+	x := &Duration{}
+	if v != _zeroDuration {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped time.Duration.
+func (x *Duration) Load() time.Duration {
+	return time.Duration(x.v.Load())
+}
+
+// Store atomically stores the passed time.Duration.
+func (x *Duration) Store(v time.Duration) {
+	x.v.Store(int64(v))
+}
+
+// CAS is an atomic compare-and-swap for time.Duration values.
+func (x *Duration) CAS(o, n time.Duration) bool {
+	return x.v.CAS(int64(o), int64(n))
+}
+
+// Swap atomically stores the given time.Duration and returns the old
+// value.
+func (x *Duration) Swap(o time.Duration) time.Duration {
+	return time.Duration(x.v.Swap(int64(o)))
+}
+
+// MarshalJSON encodes the wrapped time.Duration into JSON.
+func (x *Duration) MarshalJSON() ([]byte, error) {
+	return json.Marshal(x.Load())
+}
+
+// UnmarshalJSON decodes a time.Duration from JSON.
+func (x *Duration) UnmarshalJSON(b []byte) error {
+	var v time.Duration
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	x.Store(v)
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/duration_ext.go b/vendor/go.uber.org/atomic/duration_ext.go
new file mode 100644
index 00000000..6273b66b
--- /dev/null
+++ b/vendor/go.uber.org/atomic/duration_ext.go
@@ -0,0 +1,40 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import "time"
+
+//go:generate bin/gen-atomicwrapper -name=Duration -type=time.Duration -wrapped=Int64 -pack=int64 -unpack=time.Duration -cas -swap -json -imports time -file=duration.go
+
+// Add atomically adds to the wrapped time.Duration and returns the new value.
+func (d *Duration) Add(n time.Duration) time.Duration {
+	return time.Duration(d.v.Add(int64(n)))
+}
+
+// Sub atomically subtracts from the wrapped time.Duration and returns the new value.
+func (d *Duration) Sub(n time.Duration) time.Duration {
+	return time.Duration(d.v.Sub(int64(n)))
+}
+
+// String encodes the wrapped value as a string.
+func (d *Duration) String() string {
+	return d.Load().String()
+}
diff --git a/vendor/go.uber.org/atomic/error.go b/vendor/go.uber.org/atomic/error.go
index 0489d19b..a6166fbe 100644
--- a/vendor/go.uber.org/atomic/error.go
+++ b/vendor/go.uber.org/atomic/error.go
@@ -1,4 +1,6 @@
-// Copyright (c) 2016 Uber Technologies, Inc.
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -20,36 +22,30 @@
 
 package atomic
 
-// Error is an atomic type-safe wrapper around Value for errors
-type Error struct{ v Value }
-
-// errorHolder is non-nil holder for error object.
-// atomic.Value panics on saving nil object, so err object needs to be
-// wrapped with valid object first.
-type errorHolder struct{ err error }
+// Error is an atomic type-safe wrapper for error values.
+type Error struct {
+	_ nocmp // disallow non-atomic comparison
 
-// NewError creates new atomic error object
-func NewError(err error) *Error {
-	e := &Error{}
-	if err != nil {
-		e.Store(err)
-	}
-	return e
+	v Value
 }
 
-// Load atomically loads the wrapped error
-func (e *Error) Load() error {
-	v := e.v.Load()
-	if v == nil {
-		return nil
+var _zeroError error
+
+// NewError creates a new Error.
+func NewError(v error) *Error {
+	x := &Error{}
+	if v != _zeroError {
+		x.Store(v)
 	}
+	return x
+}
 
-	eh := v.(errorHolder)
-	return eh.err
+// Load atomically loads the wrapped error.
+func (x *Error) Load() error {
+	return unpackError(x.v.Load())
 }
 
-// Store atomically stores error.
-// NOTE: a holder object is allocated on each Store call.
-func (e *Error) Store(err error) {
-	e.v.Store(errorHolder{err: err})
+// Store atomically stores the passed error.
+func (x *Error) Store(v error) {
+	x.v.Store(packError(v))
 }
diff --git a/vendor/go.uber.org/atomic/error_ext.go b/vendor/go.uber.org/atomic/error_ext.go
new file mode 100644
index 00000000..ffe0be21
--- /dev/null
+++ b/vendor/go.uber.org/atomic/error_ext.go
@@ -0,0 +1,39 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+// atomic.Value panics on nil inputs, or if the underlying type changes.
+// Stabilize by always storing a custom struct that we control.
+
+//go:generate bin/gen-atomicwrapper -name=Error -type=error -wrapped=Value -pack=packError -unpack=unpackError -file=error.go
+
+type packedError struct{ Value error }
+
+func packError(v error) interface{} {
+	return packedError{v}
+}
+
+func unpackError(v interface{}) error {
+	if err, ok := v.(packedError); ok {
+		return err.Value
+	}
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/float64.go b/vendor/go.uber.org/atomic/float64.go
new file mode 100644
index 00000000..07190602
--- /dev/null
+++ b/vendor/go.uber.org/atomic/float64.go
@@ -0,0 +1,76 @@
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"encoding/json"
+	"math"
+)
+
+// Float64 is an atomic type-safe wrapper for float64 values.
+type Float64 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Uint64
+}
+
+var _zeroFloat64 float64
+
+// NewFloat64 creates a new Float64.
+func NewFloat64(v float64) *Float64 {
+	x := &Float64{}
+	if v != _zeroFloat64 {
+		x.Store(v)
+	}
+	return x
+}
+
+// Load atomically loads the wrapped float64.
+func (x *Float64) Load() float64 {
+	return math.Float64frombits(x.v.Load())
+}
+
+// Store atomically stores the passed float64.
+func (x *Float64) Store(v float64) {
+	x.v.Store(math.Float64bits(v))
+}
+
+// CAS is an atomic compare-and-swap for float64 values.
+func (x *Float64) CAS(o, n float64) bool {
+	return x.v.CAS(math.Float64bits(o), math.Float64bits(n))
+}
+
+// MarshalJSON encodes the wrapped float64 into JSON.
+func (x *Float64) MarshalJSON() ([]byte, error) {
+	return json.Marshal(x.Load())
+}
+
+// UnmarshalJSON decodes a float64 from JSON.
+func (x *Float64) UnmarshalJSON(b []byte) error {
+	var v float64
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	x.Store(v)
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/float64_ext.go b/vendor/go.uber.org/atomic/float64_ext.go
new file mode 100644
index 00000000..927b1add
--- /dev/null
+++ b/vendor/go.uber.org/atomic/float64_ext.go
@@ -0,0 +1,47 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import "strconv"
+
+//go:generate bin/gen-atomicwrapper -name=Float64 -type=float64 -wrapped=Uint64 -pack=math.Float64bits -unpack=math.Float64frombits -cas -json -imports math -file=float64.go
+
+// Add atomically adds to the wrapped float64 and returns the new value.
+func (f *Float64) Add(s float64) float64 {
+	for {
+		old := f.Load()
+		new := old + s
+		if f.CAS(old, new) {
+			return new
+		}
+	}
+}
+
+// Sub atomically subtracts from the wrapped float64 and returns the new value.
+func (f *Float64) Sub(s float64) float64 {
+	return f.Add(-s)
+}
+
+// String encodes the wrapped value as a string.
+func (f *Float64) String() string {
+	// 'g' is the behavior for floats with %v.
+	return strconv.FormatFloat(f.Load(), 'g', -1, 64)
+}
diff --git a/vendor/go.uber.org/atomic/gen.go b/vendor/go.uber.org/atomic/gen.go
new file mode 100644
index 00000000..50d6b248
--- /dev/null
+++ b/vendor/go.uber.org/atomic/gen.go
@@ -0,0 +1,26 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+//go:generate bin/gen-atomicint -name=Int32 -wrapped=int32 -file=int32.go
+//go:generate bin/gen-atomicint -name=Int64 -wrapped=int64 -file=int64.go
+//go:generate bin/gen-atomicint -name=Uint32 -wrapped=uint32 -unsigned -file=uint32.go
+//go:generate bin/gen-atomicint -name=Uint64 -wrapped=uint64 -unsigned -file=uint64.go
diff --git a/vendor/go.uber.org/atomic/go.mod b/vendor/go.uber.org/atomic/go.mod
index a935daeb..daa7599f 100644
--- a/vendor/go.uber.org/atomic/go.mod
+++ b/vendor/go.uber.org/atomic/go.mod
@@ -3,8 +3,6 @@ module go.uber.org/atomic
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/stretchr/testify v1.3.0
-	golang.org/x/lint v0.0.0-20190930215403-16217165b5de
-	golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c // indirect
 )
 
 go 1.13
diff --git a/vendor/go.uber.org/atomic/go.sum b/vendor/go.uber.org/atomic/go.sum
index 51b2b62a..4f76e62c 100644
--- a/vendor/go.uber.org/atomic/go.sum
+++ b/vendor/go.uber.org/atomic/go.sum
@@ -7,16 +7,3 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/lint v0.0.0-20190930215403-16217165b5de h1:5hukYrvBGR8/eNkX5mdUezrA6JiaEZDtJb9Ei+1LlBs=
-golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
-golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
-golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/tools v0.0.0-20190311212946-11955173bddd h1:/e+gpKk9r3dJobndpTytxS2gOy6m5uvpg+ISQoEcusQ=
-golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c h1:IGkKhmfzcztjm6gYkykvu/NiS8kaqbCWAEWWAyf8J5U=
-golang.org/x/tools v0.0.0-20191029041327-9cc4af7d6b2c/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/vendor/go.uber.org/atomic/int32.go b/vendor/go.uber.org/atomic/int32.go
new file mode 100644
index 00000000..18ae5649
--- /dev/null
+++ b/vendor/go.uber.org/atomic/int32.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Int32 is an atomic wrapper around int32.
+type Int32 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v int32
+}
+
+// NewInt32 creates a new Int32.
+func NewInt32(i int32) *Int32 {
+	return &Int32{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Int32) Load() int32 {
+	return atomic.LoadInt32(&i.v)
+}
+
+// Add atomically adds to the wrapped int32 and returns the new value.
+func (i *Int32) Add(n int32) int32 {
+	return atomic.AddInt32(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped int32 and returns the new value.
+func (i *Int32) Sub(n int32) int32 {
+	return atomic.AddInt32(&i.v, -n)
+}
+
+// Inc atomically increments the wrapped int32 and returns the new value.
+func (i *Int32) Inc() int32 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped int32 and returns the new value.
+func (i *Int32) Dec() int32 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Int32) CAS(old, new int32) bool {
+	return atomic.CompareAndSwapInt32(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Int32) Store(n int32) {
+	atomic.StoreInt32(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped int32 and returns the old value.
+func (i *Int32) Swap(n int32) int32 {
+	return atomic.SwapInt32(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped int32 into JSON.
+func (i *Int32) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped int32.
+func (i *Int32) UnmarshalJSON(b []byte) error {
+	var v int32
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Int32) String() string {
+	v := i.Load()
+	return strconv.FormatInt(int64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/int64.go b/vendor/go.uber.org/atomic/int64.go
new file mode 100644
index 00000000..2bcbbfaa
--- /dev/null
+++ b/vendor/go.uber.org/atomic/int64.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Int64 is an atomic wrapper around int64.
+type Int64 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v int64
+}
+
+// NewInt64 creates a new Int64.
+func NewInt64(i int64) *Int64 {
+	return &Int64{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Int64) Load() int64 {
+	return atomic.LoadInt64(&i.v)
+}
+
+// Add atomically adds to the wrapped int64 and returns the new value.
+func (i *Int64) Add(n int64) int64 {
+	return atomic.AddInt64(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped int64 and returns the new value.
+func (i *Int64) Sub(n int64) int64 {
+	return atomic.AddInt64(&i.v, -n)
+}
+
+// Inc atomically increments the wrapped int64 and returns the new value.
+func (i *Int64) Inc() int64 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped int64 and returns the new value.
+func (i *Int64) Dec() int64 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Int64) CAS(old, new int64) bool {
+	return atomic.CompareAndSwapInt64(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Int64) Store(n int64) {
+	atomic.StoreInt64(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped int64 and returns the old value.
+func (i *Int64) Swap(n int64) int64 {
+	return atomic.SwapInt64(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped int64 into JSON.
+func (i *Int64) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped int64.
+func (i *Int64) UnmarshalJSON(b []byte) error {
+	var v int64
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Int64) String() string {
+	v := i.Load()
+	return strconv.FormatInt(int64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/nocmp.go b/vendor/go.uber.org/atomic/nocmp.go
new file mode 100644
index 00000000..a8201cb4
--- /dev/null
+++ b/vendor/go.uber.org/atomic/nocmp.go
@@ -0,0 +1,35 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+// nocmp is an uncomparable struct. Embed this inside another struct to make
+// it uncomparable.
+//
+//  type Foo struct {
+//    nocmp
+//    // ...
+//  }
+//
+// This DOES NOT:
+//
+//  - Disallow shallow copies of structs
+//  - Disallow comparison of pointers to uncomparable structs
+type nocmp [0]func()
diff --git a/vendor/go.uber.org/atomic/string.go b/vendor/go.uber.org/atomic/string.go
index ede8136f..225b7a2b 100644
--- a/vendor/go.uber.org/atomic/string.go
+++ b/vendor/go.uber.org/atomic/string.go
@@ -1,4 +1,6 @@
-// Copyright (c) 2016 Uber Technologies, Inc.
+// @generated Code generated by gen-atomicwrapper.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -20,30 +22,33 @@
 
 package atomic
 
-// String is an atomic type-safe wrapper around Value for strings.
-type String struct{ v Value }
+// String is an atomic type-safe wrapper for string values.
+type String struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v Value
+}
+
+var _zeroString string
 
-// NewString creates a String.
-func NewString(str string) *String {
-	s := &String{}
-	if str != "" {
-		s.Store(str)
+// NewString creates a new String.
+func NewString(v string) *String {
+	x := &String{}
+	if v != _zeroString {
+		x.Store(v)
 	}
-	return s
+	return x
 }
 
 // Load atomically loads the wrapped string.
-func (s *String) Load() string {
-	v := s.v.Load()
-	if v == nil {
-		return ""
+func (x *String) Load() string {
+	if v := x.v.Load(); v != nil {
+		return v.(string)
 	}
-	return v.(string)
+	return _zeroString
 }
 
 // Store atomically stores the passed string.
-// Note: Converting the string to an interface{} to store in the Value
-// requires an allocation.
-func (s *String) Store(str string) {
-	s.v.Store(str)
+func (x *String) Store(v string) {
+	x.v.Store(v)
 }
diff --git a/vendor/go.uber.org/atomic/string_ext.go b/vendor/go.uber.org/atomic/string_ext.go
new file mode 100644
index 00000000..3a955821
--- /dev/null
+++ b/vendor/go.uber.org/atomic/string_ext.go
@@ -0,0 +1,43 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+//go:generate bin/gen-atomicwrapper -name=String -type=string -wrapped=Value -file=string.go
+
+// String returns the wrapped value.
+func (s *String) String() string {
+	return s.Load()
+}
+
+// MarshalText encodes the wrapped string into a textual form.
+//
+// This makes it encodable as JSON, YAML, XML, and more.
+func (s *String) MarshalText() ([]byte, error) {
+	return []byte(s.Load()), nil
+}
+
+// UnmarshalText decodes text and replaces the wrapped string with it.
+//
+// This makes it decodable from JSON, YAML, XML, and more.
+func (s *String) UnmarshalText(b []byte) error {
+	s.Store(string(b))
+	return nil
+}
diff --git a/vendor/go.uber.org/atomic/uint32.go b/vendor/go.uber.org/atomic/uint32.go
new file mode 100644
index 00000000..a973aba1
--- /dev/null
+++ b/vendor/go.uber.org/atomic/uint32.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Uint32 is an atomic wrapper around uint32.
+type Uint32 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v uint32
+}
+
+// NewUint32 creates a new Uint32.
+func NewUint32(i uint32) *Uint32 {
+	return &Uint32{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Uint32) Load() uint32 {
+	return atomic.LoadUint32(&i.v)
+}
+
+// Add atomically adds to the wrapped uint32 and returns the new value.
+func (i *Uint32) Add(n uint32) uint32 {
+	return atomic.AddUint32(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped uint32 and returns the new value.
+func (i *Uint32) Sub(n uint32) uint32 {
+	return atomic.AddUint32(&i.v, ^(n - 1))
+}
+
+// Inc atomically increments the wrapped uint32 and returns the new value.
+func (i *Uint32) Inc() uint32 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped uint32 and returns the new value.
+func (i *Uint32) Dec() uint32 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Uint32) CAS(old, new uint32) bool {
+	return atomic.CompareAndSwapUint32(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Uint32) Store(n uint32) {
+	atomic.StoreUint32(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped uint32 and returns the old value.
+func (i *Uint32) Swap(n uint32) uint32 {
+	return atomic.SwapUint32(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped uint32 into JSON.
+func (i *Uint32) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped uint32.
+func (i *Uint32) UnmarshalJSON(b []byte) error {
+	var v uint32
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Uint32) String() string {
+	v := i.Load()
+	return strconv.FormatUint(uint64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/uint64.go b/vendor/go.uber.org/atomic/uint64.go
new file mode 100644
index 00000000..3b6c71fd
--- /dev/null
+++ b/vendor/go.uber.org/atomic/uint64.go
@@ -0,0 +1,102 @@
+// @generated Code generated by gen-atomicint.
+
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import (
+	"encoding/json"
+	"strconv"
+	"sync/atomic"
+)
+
+// Uint64 is an atomic wrapper around uint64.
+type Uint64 struct {
+	_ nocmp // disallow non-atomic comparison
+
+	v uint64
+}
+
+// NewUint64 creates a new Uint64.
+func NewUint64(i uint64) *Uint64 {
+	return &Uint64{v: i}
+}
+
+// Load atomically loads the wrapped value.
+func (i *Uint64) Load() uint64 {
+	return atomic.LoadUint64(&i.v)
+}
+
+// Add atomically adds to the wrapped uint64 and returns the new value.
+func (i *Uint64) Add(n uint64) uint64 {
+	return atomic.AddUint64(&i.v, n)
+}
+
+// Sub atomically subtracts from the wrapped uint64 and returns the new value.
+func (i *Uint64) Sub(n uint64) uint64 {
+	return atomic.AddUint64(&i.v, ^(n - 1))
+}
+
+// Inc atomically increments the wrapped uint64 and returns the new value.
+func (i *Uint64) Inc() uint64 {
+	return i.Add(1)
+}
+
+// Dec atomically decrements the wrapped uint64 and returns the new value.
+func (i *Uint64) Dec() uint64 {
+	return i.Sub(1)
+}
+
+// CAS is an atomic compare-and-swap.
+func (i *Uint64) CAS(old, new uint64) bool {
+	return atomic.CompareAndSwapUint64(&i.v, old, new)
+}
+
+// Store atomically stores the passed value.
+func (i *Uint64) Store(n uint64) {
+	atomic.StoreUint64(&i.v, n)
+}
+
+// Swap atomically swaps the wrapped uint64 and returns the old value.
+func (i *Uint64) Swap(n uint64) uint64 {
+	return atomic.SwapUint64(&i.v, n)
+}
+
+// MarshalJSON encodes the wrapped uint64 into JSON.
+func (i *Uint64) MarshalJSON() ([]byte, error) {
+	return json.Marshal(i.Load())
+}
+
+// UnmarshalJSON decodes JSON into the wrapped uint64.
+func (i *Uint64) UnmarshalJSON(b []byte) error {
+	var v uint64
+	if err := json.Unmarshal(b, &v); err != nil {
+		return err
+	}
+	i.Store(v)
+	return nil
+}
+
+// String encodes the wrapped value as a string.
+func (i *Uint64) String() string {
+	v := i.Load()
+	return strconv.FormatUint(uint64(v), 10)
+}
diff --git a/vendor/go.uber.org/atomic/value.go b/vendor/go.uber.org/atomic/value.go
new file mode 100644
index 00000000..671f3a38
--- /dev/null
+++ b/vendor/go.uber.org/atomic/value.go
@@ -0,0 +1,31 @@
+// Copyright (c) 2020 Uber Technologies, Inc.
+//
+// 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.
+
+package atomic
+
+import "sync/atomic"
+
+// Value shadows the type of the same name from sync/atomic
+// https://godoc.org/sync/atomic#Value
+type Value struct {
+	atomic.Value
+
+	_ nocmp // disallow non-atomic comparison
+}