// TestBlockingNotifierUpdate tests the BlockingNotifier with a NotifyUpdate call. A ClusterChangeEvent should be generated and contain a Member representing the memberlist.Node that has been updated.
func TestBlockingNotifierUpdate(t *testing.T) {
// Create node
metadata := []byte("metadata")
node := memberlist.Node{
Name: "Node 1",
Meta: metadata,
}
// Setup notifier
out := make(chan raftor.ClusterChangeEvent)
defer close(out)
// Create blocking notifier
blocker := Notifier(out)
// Create event delegate
delegate := NewEventDelegate(blocker)
// NotifyUpdate
go func() {
delegate.NotifyUpdate(&node)
}()
// Wait for event
evt := <-out
// Test correctness
hash := uint64(murmur.Murmur3([]byte(node.Name), murmur.M3Seed))
assert.Equal(t, raftor.UpdateMember, evt.Type)
assert.Equal(t, hash, evt.Member.ID())
assert.Equal(t, metadata, evt.Member.Meta())
}
// TestBufferedNotifierJoin tests the BufferedNotifier with multiple messages.
func TestBufferedNotifier(t *testing.T) {
node := memberlist.Node{
Name: "Node 1",
}
// Hash node
hash := uint64(murmur.Murmur3([]byte(node.Name), murmur.M3Seed))
// Setup notifier
out := make(chan raftor.ClusterChangeEvent, 3)
defer close(out)
// Create blocking notifier
notifier := Notifier(out)
// Create event delegate
delegate := NewEventDelegate(notifier)
// Perform notifications
go func() {
node.Meta = []byte("join")
delegate.NotifyJoin(&node)
node.Meta = []byte("update")
delegate.NotifyUpdate(&node)
node.Meta = []byte("leave")
delegate.NotifyLeave(&node)
}()
// Test join
evt := <-out
assert.Equal(t, raftor.AddMember, evt.Type)
assert.Equal(t, hash, evt.Member.ID())
assert.True(t, bytes.Equal([]byte("join"), evt.Member.Meta()))
// Test update
evt = <-out
assert.Equal(t, raftor.UpdateMember, evt.Type)
assert.Equal(t, hash, evt.Member.ID())
assert.True(t, bytes.Equal([]byte("update"), evt.Member.Meta()))
// Test leave
evt = <-out
assert.Equal(t, raftor.RemoveMember, evt.Type)
assert.Equal(t, hash, evt.Member.ID())
assert.True(t, bytes.Equal([]byte("leave"), evt.Member.Meta()))
}
// hash performs a Murmur3 hash on the memberlist.Node name
func (n *notifier) hash(other *memberlist.Node) uint64 {
return uint64(murmur.Murmur3([]byte(other.Name), murmur.M3Seed))
}