Golang roachpb.NewGet函數代碼示例

// TestTxnMultipleCoord checks that a coordinator uses the Writing flag to
// enforce that only one coordinator can be used for transactional writes.
func TestTxnMultipleCoord(t *testing.T) {
	defer leaktest.AfterTest(t)()
	s, sender := createTestDB(t)
	defer s.Stop()

	testCases := []struct {
		args    roachpb.Request
		writing bool
		ok      bool
	}{
		{roachpb.NewGet(roachpb.Key("a")), true, false},
		{roachpb.NewGet(roachpb.Key("a")), false, true},
		{roachpb.NewPut(roachpb.Key("a"), roachpb.Value{}), false, false}, // transactional write before begin
		{roachpb.NewPut(roachpb.Key("a"), roachpb.Value{}), true, false},  // must have switched coordinators
	}

	for i, tc := range testCases {
		txn := roachpb.NewTransaction("test", roachpb.Key("a"), 1, roachpb.SERIALIZABLE,
			s.Clock.Now(), s.Clock.MaxOffset().Nanoseconds())
		txn.Writing = tc.writing
		reply, pErr := client.SendWrappedWith(sender, nil, roachpb.Header{
			Txn: txn,
		}, tc.args)
		if pErr == nil != tc.ok {
			t.Errorf("%d: %T (writing=%t): success_expected=%t, but got: %v",
				i, tc.args, tc.writing, tc.ok, pErr)
		}
		if pErr != nil {
			continue
		}

		txn = reply.Header().Txn
		// The transaction should come back rw if it started rw or if we just
		// wrote.
		isWrite := roachpb.IsTransactionWrite(tc.args)
		if (tc.writing || isWrite) != txn.Writing {
			t.Errorf("%d: unexpected writing state: %s", i, txn)
		}
		if !isWrite {
			continue
		}
		// Abort for clean shutdown.
		if _, pErr := client.SendWrappedWith(sender, nil, roachpb.Header{
			Txn: txn,
		}, &roachpb.EndTransactionRequest{
			Commit: false,
		}); pErr != nil {
			t.Fatal(pErr)
		}
	}
}

// TestTxnMultipleCoord checks that a coordinator uses the Writing flag to
// enforce that only one coordinator can be used for transactional writes.
func TestTxnMultipleCoord(t *testing.T) {
	defer leaktest.AfterTest(t)
	s := createTestDB(t)
	defer s.Stop()

	for i, tc := range []struct {
		args    roachpb.Request
		writing bool
		ok      bool
	}{
		{roachpb.NewGet(roachpb.Key("a")), true, true},
		{roachpb.NewGet(roachpb.Key("a")), false, true},
		{roachpb.NewPut(roachpb.Key("a"), roachpb.Value{}), false, true},
		{roachpb.NewPut(roachpb.Key("a"), roachpb.Value{}), true, false},
	} {
		{
			txn := newTxn(s.Clock, roachpb.Key("a"))
			txn.Writing = tc.writing
			tc.args.Header().Txn = txn
		}
		reply, err := client.SendWrapped(s.Sender, nil, tc.args)
		if err == nil != tc.ok {
			t.Errorf("%d: %T (writing=%t): success_expected=%t, but got: %v",
				i, tc.args, tc.writing, tc.ok, err)
		}
		if err != nil {
			continue
		}

		txn := reply.Header().Txn
		// The transaction should come back rw if it started rw or if we just
		// wrote.
		isWrite := roachpb.IsTransactionWrite(tc.args)
		if (tc.writing || isWrite) != txn.Writing {
			t.Errorf("%d: unexpected writing state: %s", i, txn)
		}
		if !isWrite {
			continue
		}
		// Abort for clean shutdown.
		if _, err := client.SendWrapped(s.Sender, nil, &roachpb.EndTransactionRequest{
			RequestHeader: roachpb.RequestHeader{
				Txn: txn,
			},
			Commit: false,
		}); err != nil {
			t.Fatal(err)
		}
	}
}

// Get retrieves the value for a key. A new result will be appended to the
// batch which will contain a single row.
//
//   r, err := db.Get("a")
//   // string(r.Rows[0].Key) == "a"
//
// key can be either a byte slice or a string.
func (b *Batch) Get(key interface{}) {
	k, err := marshalKey(key)
	if err != nil {
		b.initResult(0, 1, err)
		return
	}
	b.reqs = append(b.reqs, roachpb.NewGet(k))
	b.initResult(1, 1, nil)
}

// Get retrieves the value for a key. A new result will be appended to the
// batch which will contain a single row.
//
//   r, err := db.Get("a")
//   // string(r.Rows[0].Key) == "a"
//
// key can be either a byte slice or a string.
func (b *Batch) Get(key interface{}) {
	k, err := marshalKey(key)
	if err != nil {
		b.initResult(0, 1, notRaw, err)
		return
	}
	b.appendReqs(roachpb.NewGet(k))
	b.initResult(1, 1, notRaw, nil)
}

func TestNodeEventFeed(t *testing.T) {
	defer leaktest.AfterTest(t)

	nodeDesc := roachpb.NodeDescriptor{
		NodeID: roachpb.NodeID(99),
	}

	// A testCase corresponds to a single Store event type. Each case contains a
	// method which publishes a single event to the given storeEventPublisher,
	// and an expected result interface which should match the produced
	// event.
	testCases := []struct {
		publishTo func(status.NodeEventFeed)
		expected  interface{}
	}{
		{
			publishTo: func(nef status.NodeEventFeed) {
				nef.StartNode(nodeDesc, 100)
			},
			expected: &status.StartNodeEvent{
				Desc:      nodeDesc,
				StartedAt: 100,
			},
		},
		{
			publishTo: func(nef status.NodeEventFeed) {
				nef.CallComplete(wrap(roachpb.NewGet(roachpb.Key("abc"))), 0, nil)
			},
			expected: &status.CallSuccessEvent{
				NodeID: roachpb.NodeID(1),
				Method: roachpb.Get,
			},
		},
		{
			publishTo: func(nef status.NodeEventFeed) {
				nef.CallComplete(wrap(roachpb.NewPut(roachpb.Key("abc"), roachpb.MakeValueFromString("def"))), 0, nil)
			},
			expected: &status.CallSuccessEvent{
				NodeID: roachpb.NodeID(1),
				Method: roachpb.Put,
			},
		},
		{
			publishTo: func(nef status.NodeEventFeed) {
				nef.CallComplete(wrap(roachpb.NewGet(roachpb.Key("abc"))), 0, roachpb.NewErrorf("error"))
			},
			expected: &status.CallErrorEvent{
				NodeID: roachpb.NodeID(1),
				Method: roachpb.Batch,
			},
		},
		{
			publishTo: func(nef status.NodeEventFeed) {
				nef.CallComplete(wrap(roachpb.NewGet(roachpb.Key("abc"))), time.Minute, &roachpb.Error{
					Detail: &roachpb.ErrorDetail{
						WriteIntent: &roachpb.WriteIntentError{},
					},
					Index:   &roachpb.ErrPosition{Index: 0},
					Message: "boo",
				})
			},
			expected: &status.CallErrorEvent{
				NodeID:   roachpb.NodeID(1),
				Method:   roachpb.Get,
				Duration: time.Minute,
			},
		},
	}

	// Compile expected events into a single slice.
	expectedEvents := make([]interface{}, len(testCases))
	for i := range testCases {
		expectedEvents[i] = testCases[i].expected
	}

	events := make([]interface{}, 0, len(expectedEvents))

	// Run test cases directly through a feed.
	stopper := stop.NewStopper()
	defer stopper.Stop()
	feed := util.NewFeed(stopper)
	feed.Subscribe(func(event interface{}) {
		events = append(events, event)
	})

	nodefeed := status.NewNodeEventFeed(roachpb.NodeID(1), feed)
	for _, tc := range testCases {
		tc.publishTo(nodefeed)
	}

	feed.Flush()

	if a, e := events, expectedEvents; !reflect.DeepEqual(a, e) {
		t.Errorf("received incorrect events.\nexpected: %v\nactual: %v", e, a)
	}
}

//.........這裏部分代碼省略.........
		StoreID:   1,
		ReplicaID: 1,
	}
	replica2 := roachpb.ReplicaDescriptor{
		NodeID:    1,
		StoreID:   2,
		ReplicaID: 2,
	}

	// HACK: remove the second store from the node to generate a
	// non-retryable error when we try to talk to it.
	store2, err := s.Stores().GetStore(2)
	if err != nil {
		t.Fatal(err)
	}
	s.Stores().RemoveStore(store2)

	// Create the uninitialized range by sending an isolated raft
	// message to the first store.
	conn, err := s.RPCContext().GRPCDial(s.ServingAddr())
	if err != nil {
		t.Fatal(err)
	}
	raftClient := storage.NewMultiRaftClient(conn)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	stream, err := raftClient.RaftMessage(ctx)
	if err != nil {
		t.Fatal(err)
	}
	msg := storage.RaftMessageRequest{
		GroupID:     rangeID,
		ToReplica:   replica1,
		FromReplica: replica2,
		Message: raftpb.Message{
			Type: raftpb.MsgApp,
			To:   1,
		},
	}
	if err := stream.Send(&msg); err != nil {
		t.Fatal(err)
	}

	// Make sure the replica was created.
	store1, err := s.Stores().GetStore(1)
	if err != nil {
		t.Fatal(err)
	}
	util.SucceedsSoon(t, func() error {
		if replica, err := store1.GetReplica(rangeID); err != nil {
			return util.Errorf("failed to look up replica: %s", err)
		} else if replica.IsInitialized() {
			return util.Errorf("expected replica to be uninitialized")
		}
		return nil
	})

	// Create our own DistSender so we can force some requests to the
	// bogus range. The DistSender needs to be in scope for its own
	// MockRangeDescriptorDB closure.
	var sender *kv.DistSender
	sender = kv.NewDistSender(&kv.DistSenderContext{
		Clock:      s.Clock(),
		RPCContext: s.RPCContext(),
		RangeDescriptorDB: kv.MockRangeDescriptorDB(
			func(key roachpb.RKey, considerIntents, useReverseScan bool,
			) ([]roachpb.RangeDescriptor, []roachpb.RangeDescriptor, *roachpb.Error) {
				if key.Equal(roachpb.RKeyMin) {
					// Pass through requests for the first range to the real sender.
					desc, err := sender.FirstRange()
					if err != nil {
						return nil, nil, roachpb.NewError(err)
					}
					return []roachpb.RangeDescriptor{*desc}, nil, nil
				}
				return []roachpb.RangeDescriptor{{
					RangeID:  rangeID,
					StartKey: roachpb.RKey(keys.Meta2Prefix),
					EndKey:   roachpb.RKeyMax,
					Replicas: []roachpb.ReplicaDescriptor{replica1, replica2},
				}}, nil, nil
			}),
	}, s.Gossip())
	// Only inconsistent reads triggered the panic in #6027.
	hdr := roachpb.Header{
		ReadConsistency: roachpb.INCONSISTENT,
	}
	req := roachpb.NewGet(roachpb.Key("asdf"))
	// Repeat the test a few times: due to the randomization between the
	// two replicas, each attempt only had a 50% chance of triggering
	// the panic.
	for i := 0; i < 5; i++ {
		_, pErr := client.SendWrappedWith(sender, context.Background(), hdr, req)
		// Each attempt fails with "store 2 not found" because that is the
		// non-retryable error.
		if !testutils.IsPError(pErr, "store 2 not found") {
			t.Fatal(pErr)
		}
	}
}