1 files changed, 0 insertions, 57 deletions
diff --git a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/singleinflight.go b/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/singleinflight.go
deleted file mode 100644
index 9573c7d0b..000000000
--- a/vendor/github.com/rsc/letsencrypt/vendor/github.com/miekg/dns/singleinflight.go
+++ /dev/null
@@ -1,57 +0,0 @@
-// Copyright 2013 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Adapted for dns package usage by Miek Gieben.
-
-package dns
-
-import "sync"
-import "time"
-
-// call is an in-flight or completed singleflight.Do call
-type call struct {
-	wg   sync.WaitGroup
-	val  *Msg
-	rtt  time.Duration
-	err  error
-	dups int
-}
-
-// singleflight represents a class of work and forms a namespace in
-// which units of work can be executed with duplicate suppression.
-type singleflight struct {
-	sync.Mutex                  // protects m
-	m          map[string]*call // lazily initialized
-}
-
-// Do executes and returns the results of the given function, making
-// sure that only one execution is in-flight for a given key at a
-// time. If a duplicate comes in, the duplicate caller waits for the
-// original to complete and receives the same results.
-// The return value shared indicates whether v was given to multiple callers.
-func (g *singleflight) Do(key string, fn func() (*Msg, time.Duration, error)) (v *Msg, rtt time.Duration, err error, shared bool) {
-	g.Lock()
-	if g.m == nil {
-		g.m = make(map[string]*call)
-	}
-	if c, ok := g.m[key]; ok {
-		c.dups++
-		g.Unlock()
-		c.wg.Wait()
-		return c.val, c.rtt, c.err, true
-	}
-	c := new(call)
-	c.wg.Add(1)
-	g.m[key] = c
-	g.Unlock()
-
-	c.val, c.rtt, c.err = fn()
-	c.wg.Done()
-
-	g.Lock()
-	delete(g.m, key)
-	g.Unlock()
-
-	return c.val, c.rtt, c.err, c.dups > 0
-}