| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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 org.onosproject.incubator.rpc.grpc; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| import java.net.URI; |
| import java.util.Map; |
| import java.util.Objects; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Component; |
| import org.osgi.service.component.annotations.Deactivate; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.component.annotations.ReferenceCardinality; |
| import org.onosproject.incubator.rpc.RemoteServiceContext; |
| import org.onosproject.incubator.rpc.RemoteServiceContextProvider; |
| import org.onosproject.incubator.rpc.RemoteServiceContextProviderService; |
| import org.onosproject.incubator.rpc.RemoteServiceProviderRegistry; |
| import org.onosproject.net.provider.ProviderId; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import io.grpc.ManagedChannel; |
| import io.grpc.internal.DnsNameResolverProvider; |
| import io.grpc.netty.NegotiationType; |
| import io.grpc.netty.NettyChannelBuilder; |
| |
| |
| // gRPC Client side |
| /** |
| * RemoteServiceContextProvider based on gRPC. |
| */ |
| @Component(immediate = true) |
| public class GrpcRemoteServiceProvider implements RemoteServiceContextProvider { |
| |
| public static final String GRPC_SCHEME = "grpc"; |
| |
| public static final String RPC_PROVIDER_NAME = "org.onosproject.rpc.provider.grpc"; |
| |
| private static final ProviderId PID = new ProviderId(GRPC_SCHEME, RPC_PROVIDER_NAME); |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected RemoteServiceProviderRegistry rpcRegistry; |
| |
| private final Map<URI, ManagedChannel> channels = new ConcurrentHashMap<>(); |
| |
| private RemoteServiceContextProviderService providerService; |
| |
| @Activate |
| protected void activate() { |
| providerService = rpcRegistry.register(this); |
| |
| // Uncomment to test if gRPC can be loaded in karaf |
| //getChannel(URI.create("grpc://localhost:11984")); |
| |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| protected void deactivate() { |
| rpcRegistry.unregister(this); |
| |
| // shutdown all channels |
| channels.values().forEach(ManagedChannel::shutdown); |
| // Should we wait for shutdown? How? |
| channels.clear(); |
| log.info("Stopped"); |
| } |
| |
| @Override |
| public ProviderId id() { |
| return PID; |
| } |
| |
| @Override |
| public RemoteServiceContext get(URI uri) { |
| // Create gRPC client |
| return new GrpcRemoteServiceContext(getChannel(uri)); |
| } |
| |
| private ManagedChannel getChannel(URI uri) { |
| checkArgument(Objects.equals(GRPC_SCHEME, uri.getScheme()), |
| "Invalid URI scheme: %s", uri.getScheme()); |
| |
| return channels.compute(uri, (u, ch) -> { |
| if (ch != null && !ch.isShutdown()) { |
| return ch; |
| } else { |
| return createChannel(u); |
| } |
| }); |
| } |
| |
| private ManagedChannel createChannel(URI uri) { |
| log.debug("Creating channel for {}", uri); |
| int port = GrpcRemoteServiceServer.DEFAULT_LISTEN_PORT; |
| if (uri.getPort() != -1) { |
| port = uri.getPort(); |
| } |
| return NettyChannelBuilder.forAddress(uri.getHost(), port) |
| .negotiationType(NegotiationType.PLAINTEXT) |
| // TODO Not ideal fix, gRPC discovers name resolvers |
| // in the class path, but OSGi was preventing it. |
| // Manually specifying the default dns resolver for now. |
| .nameResolverFactory(new DnsNameResolverProvider()) |
| .build(); |
| } |
| |
| } |