// LockKeyspace will lock the keyspace in the topology server.
// UnlockKeyspace should be called if this returns no error.
func (n *ActionNode) LockKeyspace(ctx context.Context, ts topo.Server, keyspace string, lockTimeout time.Duration, interrupted chan struct{}) (lockPath string, err error) {
log.Infof("Locking keyspace %v for action %v", keyspace, n.Action)
span := trace.NewSpanFromContext(ctx)
span.StartClient("TopoServer.LockKeyspaceForAction")
span.Annotate("action", n.Action)
span.Annotate("keyspace", keyspace)
defer span.Finish()
return ts.LockKeyspaceForAction(keyspace, n.ToJson(), lockTimeout, interrupted)
}
func CheckKeyspaceLock(t *testing.T, ts topo.Server) {
if err := ts.CreateKeyspace("test_keyspace", &topo.Keyspace{}); err != nil {
t.Fatalf("CreateKeyspace: %v", err)
}
interrupted := make(chan struct{}, 1)
lockPath, err := ts.LockKeyspaceForAction("test_keyspace", "fake-content", 5*time.Second, interrupted)
if err != nil {
t.Fatalf("LockKeyspaceForAction: %v", err)
}
// test we can't take the lock again
if _, err := ts.LockKeyspaceForAction("test_keyspace", "unused-fake-content", time.Second/10, interrupted); err != topo.ErrTimeout {
t.Errorf("LockKeyspaceForAction(again): %v", err)
}
// test we can interrupt taking the lock
go func() {
time.Sleep(time.Second / 10)
close(interrupted)
}()
if _, err := ts.LockKeyspaceForAction("test_keyspace", "unused-fake-content", 5*time.Second, interrupted); err != topo.ErrInterrupted {
t.Errorf("LockKeyspaceForAction(interrupted): %v", err)
}
if err := ts.UnlockKeyspaceForAction("test_keyspace", lockPath, "fake-results"); err != nil {
t.Errorf("UnlockKeyspaceForAction(): %v", err)
}
// test we can't unlock again
if err := ts.UnlockKeyspaceForAction("test_keyspace", lockPath, "fake-results"); err == nil {
t.Error("UnlockKeyspaceForAction(again) worked")
}
// test we can't lock a non-existing keyspace
interrupted = make(chan struct{}, 1)
if _, err := ts.LockKeyspaceForAction("test_keyspace_666", "fake-content", 5*time.Second, interrupted); err == nil {
t.Fatalf("LockKeyspaceForAction(test_keyspace_666) worked for non-existing keyspace")
}
}