cord-776 create build / runtime containers for autmation uservices
Change-Id: I246973192adef56a250ffe93a5f65fff488840c1
diff --git a/automation/vendor/github.com/juju/utils/attempt.go b/automation/vendor/github.com/juju/utils/attempt.go
new file mode 100644
index 0000000..3becab2
--- /dev/null
+++ b/automation/vendor/github.com/juju/utils/attempt.go
@@ -0,0 +1,80 @@
+// Copyright 2011, 2012, 2013 Canonical Ltd.
+// Licensed under the LGPLv3, see LICENCE file for details.
+
+package utils
+
+import (
+ "time"
+)
+
+// The Attempt and AttemptStrategy types are copied from those in launchpad.net/goamz/aws.
+
+// AttemptStrategy represents a strategy for waiting for an action
+// to complete successfully.
+type AttemptStrategy struct {
+ Total time.Duration // total duration of attempt.
+ Delay time.Duration // interval between each try in the burst.
+ Min int // minimum number of retries; overrides Total
+}
+
+type Attempt struct {
+ strategy AttemptStrategy
+ last time.Time
+ end time.Time
+ force bool
+ count int
+}
+
+// Start begins a new sequence of attempts for the given strategy.
+func (s AttemptStrategy) Start() *Attempt {
+ now := time.Now()
+ return &Attempt{
+ strategy: s,
+ last: now,
+ end: now.Add(s.Total),
+ force: true,
+ }
+}
+
+// Next waits until it is time to perform the next attempt or returns
+// false if it is time to stop trying.
+// It always returns true the first time it is called - we are guaranteed to
+// make at least one attempt.
+func (a *Attempt) Next() bool {
+ now := time.Now()
+ sleep := a.nextSleep(now)
+ if !a.force && !now.Add(sleep).Before(a.end) && a.strategy.Min <= a.count {
+ return false
+ }
+ a.force = false
+ if sleep > 0 && a.count > 0 {
+ time.Sleep(sleep)
+ now = time.Now()
+ }
+ a.count++
+ a.last = now
+ return true
+}
+
+func (a *Attempt) nextSleep(now time.Time) time.Duration {
+ sleep := a.strategy.Delay - now.Sub(a.last)
+ if sleep < 0 {
+ return 0
+ }
+ return sleep
+}
+
+// HasNext returns whether another attempt will be made if the current
+// one fails. If it returns true, the following call to Next is
+// guaranteed to return true.
+func (a *Attempt) HasNext() bool {
+ if a.force || a.strategy.Min > a.count {
+ return true
+ }
+ now := time.Now()
+ if now.Add(a.nextSleep(now)).Before(a.end) {
+ a.force = true
+ return true
+ }
+ return false
+}