Examples with Subchannel io.grpc.LoadBalancer.Subchannel used on opensource projects

Example 26 with Subchannel

use of io.grpc.LoadBalancer.Subchannel in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method subtestGrpclbFallbackConnectionLost.

// Fallback outside of the initial timeout, where all connections are lost.
private void subtestGrpclbFallbackConnectionLost(boolean balancerBroken, boolean allSubchannelsBroken) {
    long loadReportIntervalMillis = 1983;
    InOrder inOrder = inOrder(helper, mockLbService, subchannelPool);
    // Create balancer and backend addresses
    List<EquivalentAddressGroup> backendList = createResolvedBackendAddresses(2);
    List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(backendList, grpclbBalancerList);
    inOrder.verify(helper).createOobChannel(eq(xattr(grpclbBalancerList)), eq(lbAuthority(0) + NO_USE_AUTHORITY_SUFFIX));
    // Attempted to connect to balancer
    assertEquals(1, fakeOobChannels.size());
    fakeOobChannels.poll();
    inOrder.verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    StreamObserver<LoadBalanceRequest> lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(SERVICE_AUTHORITY).build()).build()));
    lbResponseObserver.onNext(buildInitialResponse(loadReportIntervalMillis));
    // We don't care if these methods have been run.
    inOrder.verify(helper, atLeast(0)).getSynchronizationContext();
    inOrder.verify(helper, atLeast(0)).getScheduledExecutorService();
    inOrder.verifyNoMoreInteractions();
    // Balancer returns a server list
    List<ServerEntry> serverList = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(serverList));
    List<Subchannel> subchannels = fallbackTestVerifyUseOfBalancerBackendLists(inOrder, serverList);
    // Break connections
    if (balancerBroken) {
        lbResponseObserver.onError(Status.UNAVAILABLE.asException());
        // A new stream to LB is created
        inOrder.verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
        lbResponseObserver = lbResponseObserverCaptor.getValue();
        assertEquals(1, lbRequestObservers.size());
        lbRequestObserver = lbRequestObservers.poll();
        inOrder.verify(helper).refreshNameResolution();
    }
    if (allSubchannelsBroken) {
        for (Subchannel subchannel : subchannels) {
            // A READY subchannel transits to IDLE when receiving a go-away
            deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(IDLE));
            inOrder.verify(helper).refreshNameResolution();
        }
    }
    if (balancerBroken && allSubchannelsBroken) {
        // Going into fallback
        subchannels = fallbackTestVerifyUseOfFallbackBackendLists(inOrder, Arrays.asList(backendList.get(0), backendList.get(1)));
        // connections are lost
        for (Subchannel subchannel : subchannels) {
            deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(IDLE));
            inOrder.verify(helper).refreshNameResolution();
        }
        // Exit fallback mode or cancel fallback timer when receiving a new server list from balancer
        List<ServerEntry> serverList2 = Arrays.asList(new ServerEntry("127.0.0.1", 2001, "token0003"), new ServerEntry("127.0.0.1", 2011, "token0004"));
        lbResponseObserver.onNext(buildInitialResponse());
        lbResponseObserver.onNext(buildLbResponse(serverList2));
        fallbackTestVerifyUseOfBalancerBackendLists(inOrder, serverList2);
    }
    assertEquals(0, fakeClock.numPendingTasks(FALLBACK_MODE_TASK_FILTER));
    // No subchannel to fallback backends should have been created if no fallback happened
    if (!(balancerBroken && allSubchannelsBroken)) {
        verify(subchannelPool, never()).takeOrCreateSubchannel(eq(backendList.get(0)), any(Attributes.class));
        verify(subchannelPool, never()).takeOrCreateSubchannel(eq(backendList.get(1)), any(Attributes.class));
    }
}

Example 27 with Subchannel

use of io.grpc.LoadBalancer.Subchannel in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method grpclbFallback_allLost_failToFallback.

@Test
public void grpclbFallback_allLost_failToFallback() {
    long loadReportIntervalMillis = 1983;
    InOrder inOrder = inOrder(helper, mockLbService, subchannelPool);
    // Create balancer and (empty) backend addresses
    List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), grpclbBalancerList);
    inOrder.verify(helper).createOobChannel(eq(xattr(grpclbBalancerList)), eq(lbAuthority(0) + NO_USE_AUTHORITY_SUFFIX));
    // Attempted to connect to balancer
    assertEquals(1, fakeOobChannels.size());
    fakeOobChannels.poll();
    inOrder.verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    StreamObserver<LoadBalanceRequest> lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(SERVICE_AUTHORITY).build()).build()));
    lbResponseObserver.onNext(buildInitialResponse(loadReportIntervalMillis));
    // We don't care if these methods have been run.
    inOrder.verify(helper, atLeast(0)).getSynchronizationContext();
    inOrder.verify(helper, atLeast(0)).getScheduledExecutorService();
    inOrder.verifyNoMoreInteractions();
    // Balancer returns a server list
    List<ServerEntry> serverList = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(serverList));
    List<Subchannel> subchannels = fallbackTestVerifyUseOfBalancerBackendLists(inOrder, serverList);
    // Break connections
    lbResponseObserver.onError(Status.UNAVAILABLE.asException());
    // A new stream to LB is created
    inOrder.verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    assertEquals(1, lbRequestObservers.size());
    // Break all subchannel connections
    Status error = Status.UNAUTHENTICATED.withDescription("Permission denied");
    for (Subchannel subchannel : subchannels) {
        deliverSubchannelState(subchannel, ConnectivityStateInfo.forTransientFailure(error));
    }
    // Recycle all subchannels
    for (Subchannel subchannel : subchannels) {
        verify(subchannelPool).returnSubchannel(eq(subchannel), any(ConnectivityStateInfo.class));
    }
    // RPC error status includes errors of subchannels to balancer-provided backends
    inOrder.verify(helper).updateBalancingState(eq(TRANSIENT_FAILURE), pickerCaptor.capture());
    PickResult result = pickerCaptor.getValue().pickSubchannel(mock(PickSubchannelArgs.class));
    assertThat(result.getStatus().getCode()).isEqualTo(Code.UNAVAILABLE);
    assertThat(result.getStatus().getDescription()).startsWith(GrpclbState.NO_FALLBACK_BACKENDS_STATUS.getDescription());
    assertThat(result.getStatus().getDescription()).contains(error.getDescription());
}

Example 28 with Subchannel

use of io.grpc.LoadBalancer.Subchannel in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method switchMode_nullLbPolicy.

@Test
public void switchMode_nullLbPolicy() throws Exception {
    InOrder inOrder = inOrder(helper);
    final List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), grpclbBalancerList);
    assertEquals(1, fakeOobChannels.size());
    ManagedChannel oobChannel = fakeOobChannels.poll();
    verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    StreamObserver<LoadBalanceRequest> lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(SERVICE_AUTHORITY).build()).build()));
    // Simulate receiving LB response
    List<ServerEntry> backends1 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(backends1));
    // ROUND_ROBIN: create one subchannel per server
    verify(subchannelPool).takeOrCreateSubchannel(eq(new EquivalentAddressGroup(backends1.get(0).addr, LB_BACKEND_ATTRS)), any(Attributes.class));
    verify(subchannelPool).takeOrCreateSubchannel(eq(new EquivalentAddressGroup(backends1.get(1).addr, LB_BACKEND_ATTRS)), any(Attributes.class));
    inOrder.verify(helper).updateBalancingState(eq(CONNECTING), any(SubchannelPicker.class));
    assertEquals(2, mockSubchannels.size());
    Subchannel subchannel1 = mockSubchannels.poll();
    Subchannel subchannel2 = mockSubchannels.poll();
    verify(subchannelPool, never()).returnSubchannel(any(Subchannel.class), any(ConnectivityStateInfo.class));
    // Switch to PICK_FIRST
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), grpclbBalancerList, GrpclbConfig.create(Mode.PICK_FIRST));
    // GrpclbState will be shutdown, and a new one will be created
    assertThat(oobChannel.isShutdown()).isTrue();
    verify(subchannelPool).returnSubchannel(same(subchannel1), eq(ConnectivityStateInfo.forNonError(IDLE)));
    verify(subchannelPool).returnSubchannel(same(subchannel2), eq(ConnectivityStateInfo.forNonError(IDLE)));
    // A new LB stream is created
    assertEquals(1, fakeOobChannels.size());
    verify(mockLbService, times(2)).balanceLoad(lbResponseObserverCaptor.capture());
    lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(SERVICE_AUTHORITY).build()).build()));
    // Simulate receiving LB response
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(backends1));
    // PICK_FIRST Subchannel
    inOrder.verify(helper).createSubchannel(createSubchannelArgsCaptor.capture());
    CreateSubchannelArgs createSubchannelArgs = createSubchannelArgsCaptor.getValue();
    assertThat(createSubchannelArgs.getAddresses()).containsExactly(new EquivalentAddressGroup(backends1.get(0).addr, eagAttrsWithToken("token0001")), new EquivalentAddressGroup(backends1.get(1).addr, eagAttrsWithToken("token0002")));
    inOrder.verify(helper).updateBalancingState(eq(IDLE), any(SubchannelPicker.class));
}

Example 29 with Subchannel

use of io.grpc.LoadBalancer.Subchannel in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method switchServiceName.

@Test
public void switchServiceName() throws Exception {
    InOrder inOrder = inOrder(helper);
    String serviceName = "foo.google.com";
    List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), grpclbBalancerList, GrpclbConfig.create(Mode.ROUND_ROBIN, serviceName));
    assertEquals(1, fakeOobChannels.size());
    ManagedChannel oobChannel = fakeOobChannels.poll();
    verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    StreamObserver<LoadBalanceRequest> lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(serviceName).build()).build()));
    // Simulate receiving LB response
    List<ServerEntry> backends1 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(backends1));
    // ROUND_ROBIN: create one subchannel per server
    verify(subchannelPool).takeOrCreateSubchannel(eq(new EquivalentAddressGroup(backends1.get(0).addr, LB_BACKEND_ATTRS)), any(Attributes.class));
    verify(subchannelPool).takeOrCreateSubchannel(eq(new EquivalentAddressGroup(backends1.get(1).addr, LB_BACKEND_ATTRS)), any(Attributes.class));
    inOrder.verify(helper).updateBalancingState(eq(CONNECTING), any(SubchannelPicker.class));
    assertEquals(2, mockSubchannels.size());
    Subchannel subchannel1 = mockSubchannels.poll();
    Subchannel subchannel2 = mockSubchannels.poll();
    verify(subchannelPool, never()).returnSubchannel(any(Subchannel.class), any(ConnectivityStateInfo.class));
    // Switch to different serviceName
    serviceName = "bar.google.com";
    List<EquivalentAddressGroup> newGrpclbResolutionList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), newGrpclbResolutionList, GrpclbConfig.create(Mode.ROUND_ROBIN, serviceName));
    // GrpclbState will be shutdown, and a new one will be created
    assertThat(oobChannel.isShutdown()).isTrue();
    verify(subchannelPool).returnSubchannel(same(subchannel1), eq(ConnectivityStateInfo.forNonError(IDLE)));
    verify(subchannelPool).returnSubchannel(same(subchannel2), eq(ConnectivityStateInfo.forNonError(IDLE)));
    assertEquals(1, fakeOobChannels.size());
    verify(mockLbService, times(2)).balanceLoad(lbResponseObserverCaptor.capture());
    assertEquals(1, lbRequestObservers.size());
    lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(serviceName).build()).build()));
}

Example 30 with Subchannel

use of io.grpc.LoadBalancer.Subchannel in project grpc-java by grpc.

the class GrpclbLoadBalancerTest method grpclbWorking_pickFirstMode.

@Test
public void grpclbWorking_pickFirstMode() throws Exception {
    InOrder inOrder = inOrder(helper);
    List<EquivalentAddressGroup> grpclbBalancerList = createResolvedBalancerAddresses(1);
    deliverResolvedAddresses(Collections.<EquivalentAddressGroup>emptyList(), grpclbBalancerList, GrpclbConfig.create(Mode.PICK_FIRST));
    assertEquals(1, fakeOobChannels.size());
    verify(mockLbService).balanceLoad(lbResponseObserverCaptor.capture());
    StreamObserver<LoadBalanceResponse> lbResponseObserver = lbResponseObserverCaptor.getValue();
    assertEquals(1, lbRequestObservers.size());
    StreamObserver<LoadBalanceRequest> lbRequestObserver = lbRequestObservers.poll();
    verify(lbRequestObserver).onNext(eq(LoadBalanceRequest.newBuilder().setInitialRequest(InitialLoadBalanceRequest.newBuilder().setName(SERVICE_AUTHORITY).build()).build()));
    // Simulate receiving LB response
    List<ServerEntry> backends1 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), new ServerEntry("127.0.0.1", 2010, "token0002"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildInitialResponse());
    lbResponseObserver.onNext(buildLbResponse(backends1));
    inOrder.verify(helper).createSubchannel(createSubchannelArgsCaptor.capture());
    CreateSubchannelArgs createSubchannelArgs = createSubchannelArgsCaptor.getValue();
    assertThat(createSubchannelArgs.getAddresses()).containsExactly(new EquivalentAddressGroup(backends1.get(0).addr, eagAttrsWithToken("token0001")), new EquivalentAddressGroup(backends1.get(1).addr, eagAttrsWithToken("token0002")));
    // Initially IDLE
    inOrder.verify(helper).updateBalancingState(eq(IDLE), pickerCaptor.capture());
    RoundRobinPicker picker0 = (RoundRobinPicker) pickerCaptor.getValue();
    // Only one subchannel is created
    assertThat(mockSubchannels).hasSize(1);
    Subchannel subchannel = mockSubchannels.poll();
    assertThat(picker0.dropList).containsExactly(null, null);
    assertThat(picker0.pickList).containsExactly(new IdleSubchannelEntry(subchannel, syncContext));
    // PICK_FIRST doesn't eagerly connect
    verify(subchannel, never()).requestConnection();
    // CONNECTING
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(CONNECTING));
    inOrder.verify(helper).updateBalancingState(eq(CONNECTING), pickerCaptor.capture());
    RoundRobinPicker picker1 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker1.dropList).containsExactly(null, null);
    assertThat(picker1.pickList).containsExactly(BUFFER_ENTRY);
    // TRANSIENT_FAILURE
    Status error = Status.UNAVAILABLE.withDescription("Simulated connection error");
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forTransientFailure(error));
    inOrder.verify(helper).updateBalancingState(eq(TRANSIENT_FAILURE), pickerCaptor.capture());
    RoundRobinPicker picker2 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker2.dropList).containsExactly(null, null);
    assertThat(picker2.pickList).containsExactly(new ErrorEntry(error));
    // READY
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(READY));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker3 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker3.dropList).containsExactly(null, null);
    assertThat(picker3.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(getLoadRecorder())));
    // New server list with drops
    List<ServerEntry> backends2 = Arrays.asList(new ServerEntry("127.0.0.1", 2000, "token0001"), // drop
    new ServerEntry("token0003"), new ServerEntry("127.0.0.1", 2020, "token0004"));
    inOrder.verify(helper, never()).updateBalancingState(any(ConnectivityState.class), any(SubchannelPicker.class));
    lbResponseObserver.onNext(buildLbResponse(backends2));
    // new addresses will be updated to the existing subchannel
    // createSubchannel() has ever been called only once
    verify(helper, times(1)).createSubchannel(any(CreateSubchannelArgs.class));
    assertThat(mockSubchannels).isEmpty();
    verify(subchannel).updateAddresses(eq(Arrays.asList(new EquivalentAddressGroup(backends2.get(0).addr, eagAttrsWithToken("token0001")), new EquivalentAddressGroup(backends2.get(2).addr, eagAttrsWithToken("token0004")))));
    inOrder.verify(helper).updateBalancingState(eq(READY), pickerCaptor.capture());
    RoundRobinPicker picker4 = (RoundRobinPicker) pickerCaptor.getValue();
    assertThat(picker4.dropList).containsExactly(null, new DropEntry(getLoadRecorder(), "token0003"), null);
    assertThat(picker4.pickList).containsExactly(new BackendEntry(subchannel, new TokenAttachingTracerFactory(getLoadRecorder())));
    // Subchannel goes IDLE, but PICK_FIRST will not try to reconnect
    deliverSubchannelState(subchannel, ConnectivityStateInfo.forNonError(IDLE));
    inOrder.verify(helper).updateBalancingState(eq(IDLE), pickerCaptor.capture());
    RoundRobinPicker picker5 = (RoundRobinPicker) pickerCaptor.getValue();
    verify(subchannel, never()).requestConnection();
    // ... until it's selected
    PickSubchannelArgs args = mock(PickSubchannelArgs.class);
    PickResult pick = picker5.pickSubchannel(args);
    assertThat(pick).isSameInstanceAs(PickResult.withNoResult());
    verify(subchannel).requestConnection();
    // ... or requested by application
    balancer.requestConnection();
    verify(subchannel, times(2)).requestConnection();
    // PICK_FIRST doesn't use subchannelPool
    verify(subchannelPool, never()).takeOrCreateSubchannel(any(EquivalentAddressGroup.class), any(Attributes.class));
    verify(subchannelPool, never()).returnSubchannel(any(Subchannel.class), any(ConnectivityStateInfo.class));
}