fix: update lego.

vendor/go.uber.org/ratelimit/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+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.

vendor/go.uber.org/ratelimit/internal/clock/clock.go

@@ -0,0 +1,133 @@
+// 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 clock
+
+// Forked from github.com/andres-erbsen/clock to isolate a missing nap.
+
+import (
+	"container/heap"
+	"sync"
+	"time"
+)
+
+// Mock represents a mock clock that only moves forward programmically.
+// It can be preferable to a real-time clock when testing time-based functionality.
+type Mock struct {
+	sync.Mutex
+	now    time.Time // current time
+	timers Timers    // timers
+}
+
+// NewMock returns an instance of a mock clock.
+// The current time of the mock clock on initialization is the Unix epoch.
+func NewMock() *Mock {
+	return &Mock{now: time.Unix(0, 0)}
+}
+
+// Add moves the current time of the mock clock forward by the duration.
+// This should only be called from a single goroutine at a time.
+func (m *Mock) Add(d time.Duration) {
+	m.Lock()
+	// Calculate the final time.
+	end := m.now.Add(d)
+
+	for len(m.timers) > 0 && m.now.Before(end) {
+		t := heap.Pop(&m.timers).(*Timer)
+		m.now = t.next
+		m.Unlock()
+		t.Tick()
+		m.Lock()
+	}
+
+	m.Unlock()
+	// Give a small buffer to make sure the other goroutines get handled.
+	nap()
+}
+
+// Timer produces a timer that will emit a time some duration after now.
+func (m *Mock) Timer(d time.Duration) *Timer {
+	ch := make(chan time.Time)
+	t := &Timer{
+		C:    ch,
+		c:    ch,
+		mock: m,
+		next: m.now.Add(d),
+	}
+	m.addTimer(t)
+	return t
+}
+
+func (m *Mock) addTimer(t *Timer) {
+	m.Lock()
+	defer m.Unlock()
+	heap.Push(&m.timers, t)
+}
+
+// After produces a channel that will emit the time after a duration passes.
+func (m *Mock) After(d time.Duration) <-chan time.Time {
+	return m.Timer(d).C
+}
+
+// AfterFunc waits for the duration to elapse and then executes a function.
+// A Timer is returned that can be stopped.
+func (m *Mock) AfterFunc(d time.Duration, f func()) *Timer {
+	t := m.Timer(d)
+	go func() {
+		<-t.c
+		f()
+	}()
+	nap()
+	return t
+}
+
+// Now returns the current wall time on the mock clock.
+func (m *Mock) Now() time.Time {
+	m.Lock()
+	defer m.Unlock()
+	return m.now
+}
+
+// Sleep pauses the goroutine for the given duration on the mock clock.
+// The clock must be moved forward in a separate goroutine.
+func (m *Mock) Sleep(d time.Duration) {
+	<-m.After(d)
+}
+
+// Timer represents a single event.
+type Timer struct {
+	C    <-chan time.Time
+	c    chan time.Time
+	next time.Time // next tick time
+	mock *Mock     // mock clock
+}
+
+func (t *Timer) Next() time.Time { return t.next }
+
+func (t *Timer) Tick() {
+	select {
+	case t.c <- t.next:
+	default:
+	}
+	nap()
+}
+
+// Sleep momentarily so that other goroutines can process.
+func nap() { time.Sleep(1 * time.Millisecond) }

vendor/go.uber.org/ratelimit/internal/clock/interface.go

@@ -0,0 +1,34 @@
+// 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 clock
+
+import "time"
+
+// Clock represents an interface to the functions in the standard library time
+// package. Two implementations are available in the clock package. The first
+// is a real-time clock which simply wraps the time package's functions. The
+// second is a mock clock which will only make forward progress when
+// programmatically adjusted.
+type Clock interface {
+	AfterFunc(d time.Duration, f func())
+	Now() time.Time
+	Sleep(d time.Duration)
+}

vendor/go.uber.org/ratelimit/internal/clock/real.go

@@ -0,0 +1,42 @@
+// 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 clock
+
+import "time"
+
+// clock implements a real-time clock by simply wrapping the time package functions.
+type clock struct{}
+
+// New returns an instance of a real-time clock.
+func New() Clock {
+	return &clock{}
+}
+
+func (c *clock) After(d time.Duration) <-chan time.Time { return time.After(d) }
+
+func (c *clock) AfterFunc(d time.Duration, f func()) {
+	// TODO maybe return timer interface
+	time.AfterFunc(d, f)
+}
+
+func (c *clock) Now() time.Time { return time.Now() }
+
+func (c *clock) Sleep(d time.Duration) { time.Sleep(d) }

vendor/go.uber.org/ratelimit/internal/clock/timers.go

@@ -0,0 +1,44 @@
+// 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 clock
+
+// timers represents a list of sortable timers.
+type Timers []*Timer
+
+func (ts Timers) Len() int { return len(ts) }
+
+func (ts Timers) Swap(i, j int) {
+	ts[i], ts[j] = ts[j], ts[i]
+}
+
+func (ts Timers) Less(i, j int) bool {
+	return ts[i].Next().Before(ts[j].Next())
+}
+
+func (ts *Timers) Push(t interface{}) {
+	*ts = append(*ts, t.(*Timer))
+}
+
+func (ts *Timers) Pop() interface{} {
+	t := (*ts)[len(*ts)-1]
+	*ts = (*ts)[:len(*ts)-1]
+	return t
+}

vendor/go.uber.org/ratelimit/ratelimit.go

@@ -0,0 +1,140 @@
+// 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 ratelimit // import "go.uber.org/ratelimit"
+
+import (
+	"sync"
+	"time"
+
+	"go.uber.org/ratelimit/internal/clock"
+)
+
+// Note: This file is inspired by:
+// https://github.com/prashantv/go-bench/blob/master/ratelimit
+
+// Limiter is used to rate-limit some process, possibly across goroutines.
+// The process is expected to call Take() before every iteration, which
+// may block to throttle the goroutine.
+type Limiter interface {
+	// Take should block to make sure that the RPS is met.
+	Take() time.Time
+}
+
+// Clock is the minimum necessary interface to instantiate a rate limiter with
+// a clock or mock clock, compatible with clocks created using
+// github.com/andres-erbsen/clock.
+type Clock interface {
+	Now() time.Time
+	Sleep(time.Duration)
+}
+
+type limiter struct {
+	sync.Mutex
+	last       time.Time
+	sleepFor   time.Duration
+	perRequest time.Duration
+	maxSlack   time.Duration
+	clock      Clock
+}
+
+// Option configures a Limiter.
+type Option func(l *limiter)
+
+// New returns a Limiter that will limit to the given RPS.
+func New(rate int, opts ...Option) Limiter {
+	l := &limiter{
+		perRequest: time.Second / time.Duration(rate),
+		maxSlack:   -10 * time.Second / time.Duration(rate),
+	}
+	for _, opt := range opts {
+		opt(l)
+	}
+	if l.clock == nil {
+		l.clock = clock.New()
+	}
+	return l
+}
+
+// WithClock returns an option for ratelimit.New that provides an alternate
+// Clock implementation, typically a mock Clock for testing.
+func WithClock(clock Clock) Option {
+	return func(l *limiter) {
+		l.clock = clock
+	}
+}
+
+// WithoutSlack is an option for ratelimit.New that initializes the limiter
+// without any initial tolerance for bursts of traffic.
+var WithoutSlack Option = withoutSlackOption
+
+func withoutSlackOption(l *limiter) {
+	l.maxSlack = 0
+}
+
+// Take blocks to ensure that the time spent between multiple
+// Take calls is on average time.Second/rate.
+func (t *limiter) Take() time.Time {
+	t.Lock()
+	defer t.Unlock()
+
+	now := t.clock.Now()
+
+	// If this is our first request, then we allow it.
+	if t.last.IsZero() {
+		t.last = now
+		return t.last
+	}
+
+	// sleepFor calculates how much time we should sleep based on
+	// the perRequest budget and how long the last request took.
+	// Since the request may take longer than the budget, this number
+	// can get negative, and is summed across requests.
+	t.sleepFor += t.perRequest - now.Sub(t.last)
+
+	// We shouldn't allow sleepFor to get too negative, since it would mean that
+	// a service that slowed down a lot for a short period of time would get
+	// a much higher RPS following that.
+	if t.sleepFor < t.maxSlack {
+		t.sleepFor = t.maxSlack
+	}
+
+	// If sleepFor is positive, then we should sleep now.
+	if t.sleepFor > 0 {
+		t.clock.Sleep(t.sleepFor)
+		t.last = now.Add(t.sleepFor)
+		t.sleepFor = 0
+	} else {
+		t.last = now
+	}
+
+	return t.last
+}
+
+type unlimited struct{}
+
+// NewUnlimited returns a RateLimiter that is not limited.
+func NewUnlimited() Limiter {
+	return unlimited{}
+}
+
+func (unlimited) Take() time.Time {
+	return time.Now()
+}