| /* |
| * Copyright 2018-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.grpc.ctl; |
| |
| import com.google.common.collect.Maps; |
| import com.google.common.util.concurrent.Striped; |
| import io.grpc.ManagedChannel; |
| import io.grpc.ManagedChannelBuilder; |
| import io.grpc.netty.NettyChannelBuilder; |
| import org.onosproject.event.AbstractListenerManager; |
| import org.onosproject.event.Event; |
| import org.onosproject.event.EventListener; |
| import org.onosproject.grpc.api.GrpcChannelController; |
| import org.onosproject.grpc.api.GrpcChannelId; |
| import org.onosproject.grpc.api.GrpcClient; |
| import org.onosproject.grpc.api.GrpcClientController; |
| import org.onosproject.grpc.api.GrpcClientKey; |
| import org.onosproject.net.DeviceId; |
| import org.osgi.service.component.annotations.Activate; |
| import org.osgi.service.component.annotations.Deactivate; |
| import org.osgi.service.component.annotations.Reference; |
| import org.osgi.service.component.annotations.ReferenceCardinality; |
| import org.slf4j.Logger; |
| |
| import java.util.Map; |
| import java.util.concurrent.locks.Lock; |
| import java.util.function.Supplier; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static java.lang.String.format; |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * Abstract class of a gRPC based client controller for specific gRPC client |
| * which provides basic gRPC client management and thread safe mechanism. |
| * |
| * @param <C> the gRPC client type |
| * @param <K> the key type of the gRPC client |
| * @param <E> the event type of the gRPC client |
| * @param <L> the event listener of event {@link E} |
| */ |
| public abstract class AbstractGrpcClientController |
| <K extends GrpcClientKey, C extends GrpcClient, E extends Event, L extends EventListener<E>> |
| extends AbstractListenerManager<E, L> |
| implements GrpcClientController<K, C> { |
| |
| /** |
| * The default max inbound message size (MB). |
| */ |
| private static final int DEFAULT_MAX_INBOUND_MSG_SIZE = 256; // Megabytes. |
| private static final int MEGABYTES = 1024 * 1024; |
| private static final int DEFAULT_DEVICE_LOCK_SIZE = 30; |
| |
| private final Logger log = getLogger(getClass()); |
| private final Map<DeviceId, K> clientKeys = Maps.newHashMap(); |
| private final Map<K, C> clients = Maps.newHashMap(); |
| private final Map<DeviceId, GrpcChannelId> channelIds = Maps.newHashMap(); |
| private final Striped<Lock> stripedLocks = Striped.lock(DEFAULT_DEVICE_LOCK_SIZE); |
| |
| @Reference(cardinality = ReferenceCardinality.MANDATORY) |
| protected GrpcChannelController grpcChannelController; |
| |
| @Activate |
| public void activate() { |
| log.info("Started"); |
| } |
| |
| @Deactivate |
| public void deactivate() { |
| clientKeys.keySet().forEach(this::removeClient); |
| clientKeys.clear(); |
| clients.clear(); |
| channelIds.clear(); |
| log.info("Stopped"); |
| } |
| |
| @Override |
| public boolean createClient(K clientKey) { |
| checkNotNull(clientKey); |
| return withDeviceLock(() -> doCreateClient(clientKey), clientKey.deviceId()); |
| } |
| |
| |
| private boolean doCreateClient(K clientKey) { |
| DeviceId deviceId = clientKey.deviceId(); |
| String serverAddr = clientKey.serverAddr(); |
| int serverPort = clientKey.serverPort(); |
| |
| if (clientKeys.containsKey(deviceId)) { |
| final GrpcClientKey existingKey = clientKeys.get(deviceId); |
| if (clientKey.equals(existingKey)) { |
| log.debug("Not creating {} as it already exists... (key={})", |
| clientName(clientKey), clientKey); |
| return true; |
| } else { |
| log.info("Requested new {} with updated key, removing old client... (oldKey={})", |
| clientName(clientKey), existingKey); |
| doRemoveClient(deviceId); |
| } |
| } |
| |
| log.info("Creating client for {} (server={}:{})...", |
| deviceId, serverAddr, serverPort); |
| GrpcChannelId channelId = GrpcChannelId.of(clientKey.deviceId(), clientKey.toString()); |
| ManagedChannelBuilder channelBuilder = NettyChannelBuilder |
| .forAddress(serverAddr, serverPort) |
| .maxInboundMessageSize(DEFAULT_MAX_INBOUND_MSG_SIZE * MEGABYTES) |
| .usePlaintext(); |
| |
| final ManagedChannel channel; |
| |
| channel = grpcChannelController.connectChannel(channelId, channelBuilder); |
| |
| |
| final C client; |
| try { |
| client = createClientInstance(clientKey, channel); |
| } catch (Throwable e) { |
| log.error("Exception while creating {}", clientName(clientKey), e); |
| grpcChannelController.disconnectChannel(channelId); |
| return false; |
| } |
| |
| if (client == null) { |
| log.error("Unable to create {}, implementation returned null... (key={})", |
| clientName(clientKey), clientKey); |
| grpcChannelController.disconnectChannel(channelId); |
| return false; |
| } |
| |
| clientKeys.put(deviceId, clientKey); |
| clients.put(clientKey, client); |
| channelIds.put(deviceId, channelId); |
| |
| return true; |
| } |
| |
| protected abstract C createClientInstance(K clientKey, ManagedChannel channel); |
| |
| @Override |
| public C getClient(DeviceId deviceId) { |
| checkNotNull(deviceId); |
| return withDeviceLock(() -> doGetClient(deviceId), deviceId); |
| } |
| |
| private C doGetClient(DeviceId deviceId) { |
| if (!clientKeys.containsKey(deviceId)) { |
| return null; |
| } |
| return clients.get(clientKeys.get(deviceId)); |
| } |
| |
| @Override |
| public void removeClient(DeviceId deviceId) { |
| checkNotNull(deviceId); |
| withDeviceLock(() -> doRemoveClient(deviceId), deviceId); |
| } |
| |
| private Void doRemoveClient(DeviceId deviceId) { |
| if (clientKeys.containsKey(deviceId)) { |
| final K clientKey = clientKeys.get(deviceId); |
| clients.get(clientKey).shutdown(); |
| grpcChannelController.disconnectChannel(channelIds.get(deviceId)); |
| clientKeys.remove(deviceId); |
| clients.remove(clientKey); |
| channelIds.remove(deviceId); |
| } |
| return null; |
| } |
| |
| @Override |
| public boolean isReachable(DeviceId deviceId) { |
| checkNotNull(deviceId); |
| return withDeviceLock(() -> doIsReachable(deviceId), deviceId); |
| } |
| |
| private boolean doIsReachable(DeviceId deviceId) { |
| // Default behaviour checks only the gRPC channel, should |
| // check according to different gRPC service |
| if (!clientKeys.containsKey(deviceId)) { |
| log.debug("Missing client for {}, cannot check for reachability", deviceId); |
| return false; |
| } |
| return grpcChannelController.isChannelOpen(channelIds.get(deviceId)); |
| } |
| |
| private <U> U withDeviceLock(Supplier<U> task, DeviceId deviceId) { |
| final Lock lock = stripedLocks.get(deviceId); |
| lock.lock(); |
| try { |
| return task.get(); |
| } finally { |
| lock.unlock(); |
| } |
| } |
| |
| private String clientName(GrpcClientKey key) { |
| return format("%s client for %s", key.serviceName(), key.deviceId()); |
| } |
| } |