예제 #1
0
파일: utils.go 프로젝트: henryanand/vitess
// LockSrvShard will lock the serving shard in the topology server.
// UnlockSrvShard should be called if this returns no error.
func (n *ActionNode) LockSrvShard(ctx context.Context, ts topo.Server, cell, keyspace, shard string, lockTimeout time.Duration, interrupted chan struct{}) (lockPath string, err error) {
	log.Infof("Locking serving shard %v/%v/%v for action %v", cell, keyspace, shard, n.Action)

	span := trace.NewSpanFromContext(ctx)
	span.StartClient("TopoServer.LockSrvShardForAction")
	span.Annotate("action", n.Action)
	span.Annotate("keyspace", keyspace)
	span.Annotate("shard", shard)
	span.Annotate("cell", cell)
	defer span.Finish()

	return ts.LockSrvShardForAction(cell, keyspace, shard, n.ToJson(), lockTimeout, interrupted)
}
예제 #2
0
파일: lock.go 프로젝트: henryanand/vitess
func CheckSrvShardLock(t *testing.T, ts topo.Server) {
	// make sure we can create the lock even if no directory exists
	interrupted := make(chan struct{}, 1)
	lockPath, err := ts.LockSrvShardForAction("test", "test_keyspace", "10-20", "fake-content", 5*time.Second, interrupted)
	if err != nil {
		t.Fatalf("LockSrvShardForAction: %v", err)
	}

	if err := ts.UnlockSrvShardForAction("test", "test_keyspace", "10-20", lockPath, "fake-results"); err != nil {
		t.Errorf("UnlockShardForAction(): %v", err)
	}

	// now take the lock again after the root exists
	lockPath, err = ts.LockSrvShardForAction("test", "test_keyspace", "10-20", "fake-content", 5*time.Second, interrupted)
	if err != nil {
		t.Fatalf("LockSrvShardForAction: %v", err)
	}

	// test we can't take the lock again
	if _, err := ts.LockSrvShardForAction("test", "test_keyspace", "10-20", "unused-fake-content", time.Second/2, interrupted); err != topo.ErrTimeout {
		t.Errorf("LockSrvShardForAction(again): %v", err)
	}

	// test we can interrupt taking the lock
	go func() {
		time.Sleep(time.Second / 2)
		close(interrupted)
	}()
	if _, err := ts.LockSrvShardForAction("test", "test_keyspace", "10-20", "unused-fake-content", 5*time.Second, interrupted); err != topo.ErrInterrupted {
		t.Errorf("LockSrvShardForAction(interrupted): %v", err)
	}

	// unlock now
	if err := ts.UnlockSrvShardForAction("test", "test_keyspace", "10-20", lockPath, "fake-results"); err != nil {
		t.Errorf("UnlockSrvShardForAction(): %v", err)
	}

	// test we can't unlock again
	if err := ts.UnlockSrvShardForAction("test", "test_keyspace", "10-20", lockPath, "fake-results"); err == nil {
		t.Error("UnlockSrvShardForAction(again) worked")
	}

}