[VOL-2193] Create mocks for Kafka Client and Etcd
This commit consists of:
1) A kafka client mock that implements the kafka client interface
under voltha-lib-go/pkg/kafka/client.go
2) An embedded Etcd server that runs in-process and represents an
Etcd server.
Change-Id: I52a36132568e08c596bb4136918bebcb654a3b99
diff --git a/vendor/github.com/jonboulle/clockwork/.gitignore b/vendor/github.com/jonboulle/clockwork/.gitignore
new file mode 100644
index 0000000..010c242
--- /dev/null
+++ b/vendor/github.com/jonboulle/clockwork/.gitignore
@@ -0,0 +1,25 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+
+*.swp
diff --git a/vendor/github.com/jonboulle/clockwork/.travis.yml b/vendor/github.com/jonboulle/clockwork/.travis.yml
new file mode 100644
index 0000000..aefda90
--- /dev/null
+++ b/vendor/github.com/jonboulle/clockwork/.travis.yml
@@ -0,0 +1,5 @@
+language: go
+go:
+ - 1.3
+
+sudo: false
diff --git a/vendor/github.com/jonboulle/clockwork/LICENSE b/vendor/github.com/jonboulle/clockwork/LICENSE
new file mode 100644
index 0000000..5c304d1
--- /dev/null
+++ b/vendor/github.com/jonboulle/clockwork/LICENSE
@@ -0,0 +1,201 @@
+Apache License
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diff --git a/vendor/github.com/jonboulle/clockwork/README.md b/vendor/github.com/jonboulle/clockwork/README.md
new file mode 100644
index 0000000..d43a6c7
--- /dev/null
+++ b/vendor/github.com/jonboulle/clockwork/README.md
@@ -0,0 +1,61 @@
+clockwork
+=========
+
+[](https://travis-ci.org/jonboulle/clockwork)
+[](http://godoc.org/github.com/jonboulle/clockwork)
+
+a simple fake clock for golang
+
+# Usage
+
+Replace uses of the `time` package with the `clockwork.Clock` interface instead.
+
+For example, instead of using `time.Sleep` directly:
+
+```
+func my_func() {
+ time.Sleep(3 * time.Second)
+ do_something()
+}
+```
+
+inject a clock and use its `Sleep` method instead:
+
+```
+func my_func(clock clockwork.Clock) {
+ clock.Sleep(3 * time.Second)
+ do_something()
+}
+```
+
+Now you can easily test `my_func` with a `FakeClock`:
+
+```
+func TestMyFunc(t *testing.T) {
+ c := clockwork.NewFakeClock()
+
+ // Start our sleepy function
+ my_func(c)
+
+ // Ensure we wait until my_func is sleeping
+ c.BlockUntil(1)
+
+ assert_state()
+
+ // Advance the FakeClock forward in time
+ c.Advance(3)
+
+ assert_state()
+}
+```
+
+and in production builds, simply inject the real clock instead:
+```
+my_func(clockwork.NewRealClock())
+```
+
+See [example_test.go](example_test.go) for a full example.
+
+# Credits
+
+clockwork is inspired by @wickman's [threaded fake clock](https://gist.github.com/wickman/3840816), and the [Golang playground](http://blog.golang.org/playground#Faking time)
diff --git a/vendor/github.com/jonboulle/clockwork/clockwork.go b/vendor/github.com/jonboulle/clockwork/clockwork.go
new file mode 100644
index 0000000..9ec96ed
--- /dev/null
+++ b/vendor/github.com/jonboulle/clockwork/clockwork.go
@@ -0,0 +1,169 @@
+package clockwork
+
+import (
+ "sync"
+ "time"
+)
+
+// Clock provides an interface that packages can use instead of directly
+// using the time module, so that chronology-related behavior can be tested
+type Clock interface {
+ After(d time.Duration) <-chan time.Time
+ Sleep(d time.Duration)
+ Now() time.Time
+}
+
+// FakeClock provides an interface for a clock which can be
+// manually advanced through time
+type FakeClock interface {
+ Clock
+ // Advance advances the FakeClock to a new point in time, ensuring any existing
+ // sleepers are notified appropriately before returning
+ Advance(d time.Duration)
+ // BlockUntil will block until the FakeClock has the given number of
+ // sleepers (callers of Sleep or After)
+ BlockUntil(n int)
+}
+
+// NewRealClock returns a Clock which simply delegates calls to the actual time
+// package; it should be used by packages in production.
+func NewRealClock() Clock {
+ return &realClock{}
+}
+
+// NewFakeClock returns a FakeClock implementation which can be
+// manually advanced through time for testing. The initial time of the
+// FakeClock will be an arbitrary non-zero time.
+func NewFakeClock() FakeClock {
+ // use a fixture that does not fulfill Time.IsZero()
+ return NewFakeClockAt(time.Date(1984, time.April, 4, 0, 0, 0, 0, time.UTC))
+}
+
+// NewFakeClockAt returns a FakeClock initialised at the given time.Time.
+func NewFakeClockAt(t time.Time) FakeClock {
+ return &fakeClock{
+ time: t,
+ }
+}
+
+type realClock struct{}
+
+func (rc *realClock) After(d time.Duration) <-chan time.Time {
+ return time.After(d)
+}
+
+func (rc *realClock) Sleep(d time.Duration) {
+ time.Sleep(d)
+}
+
+func (rc *realClock) Now() time.Time {
+ return time.Now()
+}
+
+type fakeClock struct {
+ sleepers []*sleeper
+ blockers []*blocker
+ time time.Time
+
+ l sync.RWMutex
+}
+
+// sleeper represents a caller of After or Sleep
+type sleeper struct {
+ until time.Time
+ done chan time.Time
+}
+
+// blocker represents a caller of BlockUntil
+type blocker struct {
+ count int
+ ch chan struct{}
+}
+
+// After mimics time.After; it waits for the given duration to elapse on the
+// fakeClock, then sends the current time on the returned channel.
+func (fc *fakeClock) After(d time.Duration) <-chan time.Time {
+ fc.l.Lock()
+ defer fc.l.Unlock()
+ now := fc.time
+ done := make(chan time.Time, 1)
+ if d.Nanoseconds() == 0 {
+ // special case - trigger immediately
+ done <- now
+ } else {
+ // otherwise, add to the set of sleepers
+ s := &sleeper{
+ until: now.Add(d),
+ done: done,
+ }
+ fc.sleepers = append(fc.sleepers, s)
+ // and notify any blockers
+ fc.blockers = notifyBlockers(fc.blockers, len(fc.sleepers))
+ }
+ return done
+}
+
+// notifyBlockers notifies all the blockers waiting until the
+// given number of sleepers are waiting on the fakeClock. It
+// returns an updated slice of blockers (i.e. those still waiting)
+func notifyBlockers(blockers []*blocker, count int) (newBlockers []*blocker) {
+ for _, b := range blockers {
+ if b.count == count {
+ close(b.ch)
+ } else {
+ newBlockers = append(newBlockers, b)
+ }
+ }
+ return
+}
+
+// Sleep blocks until the given duration has passed on the fakeClock
+func (fc *fakeClock) Sleep(d time.Duration) {
+ <-fc.After(d)
+}
+
+// Time returns the current time of the fakeClock
+func (fc *fakeClock) Now() time.Time {
+ fc.l.RLock()
+ t := fc.time
+ fc.l.RUnlock()
+ return t
+}
+
+// Advance advances fakeClock to a new point in time, ensuring channels from any
+// previous invocations of After are notified appropriately before returning
+func (fc *fakeClock) Advance(d time.Duration) {
+ fc.l.Lock()
+ defer fc.l.Unlock()
+ end := fc.time.Add(d)
+ var newSleepers []*sleeper
+ for _, s := range fc.sleepers {
+ if end.Sub(s.until) >= 0 {
+ s.done <- end
+ } else {
+ newSleepers = append(newSleepers, s)
+ }
+ }
+ fc.sleepers = newSleepers
+ fc.blockers = notifyBlockers(fc.blockers, len(fc.sleepers))
+ fc.time = end
+}
+
+// BlockUntil will block until the fakeClock has the given number of sleepers
+// (callers of Sleep or After)
+func (fc *fakeClock) BlockUntil(n int) {
+ fc.l.Lock()
+ // Fast path: current number of sleepers is what we're looking for
+ if len(fc.sleepers) == n {
+ fc.l.Unlock()
+ return
+ }
+ // Otherwise, set up a new blocker
+ b := &blocker{
+ count: n,
+ ch: make(chan struct{}),
+ }
+ fc.blockers = append(fc.blockers, b)
+ fc.l.Unlock()
+ <-b.ch
+}