| /* |
| * Copyright 2016 The gRPC Authors |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package io.grpc.internal; |
| |
| import static com.google.common.base.MoreObjects.firstNonNull; |
| import static com.google.common.base.Preconditions.checkNotNull; |
| |
| import io.grpc.Attributes; |
| import io.grpc.CallCredentials; |
| import io.grpc.CallCredentials.RequestInfo; |
| import io.grpc.CallOptions; |
| import io.grpc.ChannelCredentials; |
| import io.grpc.ChannelLogger; |
| import io.grpc.ClientStreamTracer; |
| import io.grpc.CompositeCallCredentials; |
| import io.grpc.Metadata; |
| import io.grpc.MethodDescriptor; |
| import io.grpc.SecurityLevel; |
| import io.grpc.Status; |
| import io.grpc.internal.MetadataApplierImpl.MetadataApplierListener; |
| import java.net.SocketAddress; |
| import java.util.concurrent.Executor; |
| import java.util.concurrent.ScheduledExecutorService; |
| import java.util.concurrent.atomic.AtomicInteger; |
| import javax.annotation.concurrent.GuardedBy; |
| |
| final class CallCredentialsApplyingTransportFactory implements ClientTransportFactory { |
| private final ClientTransportFactory delegate; |
| private final CallCredentials channelCallCredentials; |
| private final Executor appExecutor; |
| |
| CallCredentialsApplyingTransportFactory( |
| ClientTransportFactory delegate, CallCredentials channelCallCredentials, |
| Executor appExecutor) { |
| this.delegate = checkNotNull(delegate, "delegate"); |
| this.channelCallCredentials = channelCallCredentials; |
| this.appExecutor = checkNotNull(appExecutor, "appExecutor"); |
| } |
| |
| @Override |
| public ConnectionClientTransport newClientTransport( |
| SocketAddress serverAddress, ClientTransportOptions options, ChannelLogger channelLogger) { |
| return new CallCredentialsApplyingTransport( |
| delegate.newClientTransport(serverAddress, options, channelLogger), options.getAuthority()); |
| } |
| |
| @Override |
| public ScheduledExecutorService getScheduledExecutorService() { |
| return delegate.getScheduledExecutorService(); |
| } |
| |
| @Override |
| public SwapChannelCredentialsResult swapChannelCredentials(ChannelCredentials channelCreds) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void close() { |
| delegate.close(); |
| } |
| |
| private class CallCredentialsApplyingTransport extends ForwardingConnectionClientTransport { |
| private final ConnectionClientTransport delegate; |
| private final String authority; |
| // Negative value means transport active, non-negative value indicates shutdown invoked. |
| private final AtomicInteger pendingApplier = new AtomicInteger(Integer.MIN_VALUE + 1); |
| private volatile Status shutdownStatus; |
| @GuardedBy("this") |
| private Status savedShutdownStatus; |
| @GuardedBy("this") |
| private Status savedShutdownNowStatus; |
| private final MetadataApplierListener applierListener = new MetadataApplierListener() { |
| @Override |
| public void onComplete() { |
| if (pendingApplier.decrementAndGet() == 0) { |
| maybeShutdown(); |
| } |
| } |
| }; |
| |
| CallCredentialsApplyingTransport(ConnectionClientTransport delegate, String authority) { |
| this.delegate = checkNotNull(delegate, "delegate"); |
| this.authority = checkNotNull(authority, "authority"); |
| } |
| |
| @Override |
| protected ConnectionClientTransport delegate() { |
| return delegate; |
| } |
| |
| @Override |
| @SuppressWarnings("deprecation") |
| public ClientStream newStream( |
| final MethodDescriptor<?, ?> method, Metadata headers, final CallOptions callOptions, |
| ClientStreamTracer[] tracers) { |
| CallCredentials creds = callOptions.getCredentials(); |
| if (creds == null) { |
| creds = channelCallCredentials; |
| } else if (channelCallCredentials != null) { |
| creds = new CompositeCallCredentials(channelCallCredentials, creds); |
| } |
| if (creds != null) { |
| MetadataApplierImpl applier = new MetadataApplierImpl( |
| delegate, method, headers, callOptions, applierListener, tracers); |
| if (pendingApplier.incrementAndGet() > 0) { |
| applierListener.onComplete(); |
| return new FailingClientStream(shutdownStatus, tracers); |
| } |
| RequestInfo requestInfo = new RequestInfo() { |
| @Override |
| public MethodDescriptor<?, ?> getMethodDescriptor() { |
| return method; |
| } |
| |
| @Override |
| public SecurityLevel getSecurityLevel() { |
| return firstNonNull( |
| delegate.getAttributes().get(GrpcAttributes.ATTR_SECURITY_LEVEL), |
| SecurityLevel.NONE); |
| } |
| |
| @Override |
| public String getAuthority() { |
| return firstNonNull(callOptions.getAuthority(), authority); |
| } |
| |
| @Override |
| public Attributes getTransportAttrs() { |
| return delegate.getAttributes(); |
| } |
| }; |
| try { |
| creds.applyRequestMetadata( |
| requestInfo, firstNonNull(callOptions.getExecutor(), appExecutor), applier); |
| } catch (Throwable t) { |
| applier.fail(Status.UNAUTHENTICATED |
| .withDescription("Credentials should use fail() instead of throwing exceptions") |
| .withCause(t)); |
| } |
| return applier.returnStream(); |
| } else { |
| if (pendingApplier.get() >= 0) { |
| return new FailingClientStream(shutdownStatus, tracers); |
| } |
| return delegate.newStream(method, headers, callOptions, tracers); |
| } |
| } |
| |
| @Override |
| public void shutdown(Status status) { |
| checkNotNull(status, "status"); |
| synchronized (this) { |
| if (pendingApplier.get() < 0) { |
| shutdownStatus = status; |
| pendingApplier.addAndGet(Integer.MAX_VALUE); |
| } else { |
| return; |
| } |
| if (pendingApplier.get() != 0) { |
| savedShutdownStatus = status; |
| return; |
| } |
| } |
| super.shutdown(status); |
| } |
| |
| // TODO(zivy): cancel pending applier here. |
| @Override |
| public void shutdownNow(Status status) { |
| checkNotNull(status, "status"); |
| synchronized (this) { |
| if (pendingApplier.get() < 0) { |
| shutdownStatus = status; |
| pendingApplier.addAndGet(Integer.MAX_VALUE); |
| } else if (savedShutdownNowStatus != null) { |
| return; |
| } |
| if (pendingApplier.get() != 0) { |
| savedShutdownNowStatus = status; |
| // TODO(zivy): propagate shutdownNow to the delegate immediately. |
| return; |
| } |
| } |
| super.shutdownNow(status); |
| } |
| |
| private void maybeShutdown() { |
| Status maybeShutdown; |
| Status maybeShutdownNow; |
| synchronized (this) { |
| if (pendingApplier.get() != 0) { |
| return; |
| } |
| maybeShutdown = savedShutdownStatus; |
| maybeShutdownNow = savedShutdownNowStatus; |
| savedShutdownStatus = null; |
| savedShutdownNowStatus = null; |
| } |
| if (maybeShutdown != null) { |
| super.shutdown(maybeShutdown); |
| } |
| if (maybeShutdownNow != null) { |
| super.shutdownNow(maybeShutdownNow); |
| } |
| } |
| } |
| } |