org.opendaylight.controller.remote.rpc.OpsInvoker Maven / Gradle / Ivy
/*
* Copyright (c) 2014 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.controller.remote.rpc;
import static java.util.Objects.requireNonNull;
import akka.actor.ActorRef;
import akka.actor.Props;
import akka.actor.Status.Failure;
import com.google.common.base.Throwables;
import com.google.common.util.concurrent.FutureCallback;
import com.google.common.util.concurrent.Futures;
import com.google.common.util.concurrent.ListenableFuture;
import com.google.common.util.concurrent.MoreExecutors;
import java.util.Collection;
import org.eclipse.jdt.annotation.NonNull;
import org.opendaylight.controller.cluster.common.actor.AbstractUntypedActor;
import org.opendaylight.controller.remote.rpc.messages.ActionResponse;
import org.opendaylight.controller.remote.rpc.messages.ExecuteAction;
import org.opendaylight.controller.remote.rpc.messages.ExecuteRpc;
import org.opendaylight.controller.remote.rpc.messages.RpcResponse;
import org.opendaylight.mdsal.dom.api.DOMActionResult;
import org.opendaylight.mdsal.dom.api.DOMActionService;
import org.opendaylight.mdsal.dom.api.DOMDataTreeIdentifier;
import org.opendaylight.mdsal.dom.api.DOMRpcResult;
import org.opendaylight.mdsal.dom.api.DOMRpcService;
import org.opendaylight.yangtools.yang.common.QName;
import org.opendaylight.yangtools.yang.common.RpcError;
import org.opendaylight.yangtools.yang.data.api.schema.ContainerNode;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.model.api.stmt.SchemaNodeIdentifier.Absolute;
/**
* Actor receiving invocation requests from remote nodes, routing them to
* {@link DOMRpcService#invokeRpc(SchemaPath, NormalizedNode)} and
* {@link DOMActionService#invokeAction(SchemaPath, DOMDataTreeIdentifier, ContainerNode)}.
*
*
* Note that while the two interfaces are very similar, invocation strategies are slightly different due to historic
* behavior of RPCs:
*
* - RPCs allow both null input and output, and this is passed to the infrastructure. Furthermore any invocation
* which results in errors being reported drops the output content, even if it is present -- which is wrong, as
* 'errors' in this case can also be just warnings.
* - Actions do not allow null input, but allow null output. If the output is present, it is passed along with any
* errors reported.
*
*/
final class OpsInvoker extends AbstractUntypedActor {
private final DOMRpcService rpcService;
private final DOMActionService actionService;
private OpsInvoker(final DOMRpcService rpcService, final DOMActionService actionService) {
this.rpcService = requireNonNull(rpcService);
this.actionService = requireNonNull(actionService);
}
public static Props props(final DOMRpcService rpcService, final DOMActionService actionService) {
return Props.create(OpsInvoker.class,
requireNonNull(rpcService, "DOMRpcService can not be null"),
requireNonNull(actionService, "DOMActionService can not be null"));
}
@Override
protected void handleReceive(final Object message) {
if (message instanceof ExecuteRpc executeRpc) {
LOG.debug("Handling ExecuteOps Message");
execute(executeRpc);
} else if (message instanceof ExecuteAction executeAction) {
execute(executeAction);
} else {
unknownMessage(message);
}
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void execute(final ExecuteRpc msg) {
LOG.debug("Executing RPC {}", msg.getType());
final ActorRef sender = getSender();
final ListenableFuture future;
try {
future = rpcService.invokeRpc(msg.getType(), msg.getInput());
} catch (final RuntimeException e) {
LOG.debug("Failed to invoke RPC {}", msg.getType(), e);
sender.tell(new Failure(e), self());
return;
}
Futures.addCallback(future, new AbstractCallback(getSender(), msg.getType()) {
@Override
Object nullResponse(final QName type) {
LOG.warn("Execution of {} resulted in null result", type);
return new RpcResponse(null);
}
@Override
Object response(final QName type, final DOMRpcResult result) {
final Collection errors = result.errors();
return errors.isEmpty() ? new RpcResponse(result.value())
// This is legacy (wrong) behavior, which ignores the fact that errors may be just warnings,
// discarding any output
: new Failure(new RpcErrorsException(String.format("Execution of rpc %s failed", type),
errors));
}
}, MoreExecutors.directExecutor());
}
@SuppressWarnings("checkstyle:IllegalCatch")
private void execute(final ExecuteAction msg) {
LOG.debug("Executing Action {}", msg.getType());
final ActorRef sender = getSender();
final ListenableFuture future;
try {
future = actionService.invokeAction(msg.getType(), msg.getPath(), msg.getInput());
} catch (final RuntimeException e) {
LOG.debug("Failed to invoke action {}", msg.getType(), e);
sender.tell(new Failure(e), self());
return;
}
Futures.addCallback(future, new AbstractCallback(getSender(), msg.getType()) {
@Override
Object nullResponse(final Absolute type) {
throw new IllegalStateException("Null invocation result of action " + type);
}
@Override
Object response(final Absolute type, final DOMActionResult result) {
final Collection errors = result.getErrors();
return errors.isEmpty() ? new ActionResponse(result.getOutput(), result.getErrors())
// This is legacy (wrong) behavior, which ignores the fact that errors may be just warnings,
// discarding any output
: new Failure(new RpcErrorsException(String.format("Execution of action %s failed", type),
errors));
}
}, MoreExecutors.directExecutor());
}
private abstract class AbstractCallback implements FutureCallback {
private final ActorRef replyTo;
private final T type;
AbstractCallback(final ActorRef replyTo, final T type) {
this.replyTo = requireNonNull(replyTo);
this.type = requireNonNull(type);
}
@Override
public final void onSuccess(final R result) {
final Object response;
if (result == null) {
// This shouldn't happen but the FutureCallback annotates the result param with Nullable so handle null
// here to avoid FindBugs warning.
response = nullResponse(type);
} else {
response = response(type, result);
}
LOG.debug("Sending response for execution of {} : {}", type, response);
replyTo.tell(response, self());
}
@Override
public final void onFailure(final Throwable failure) {
LOG.debug("Failed to execute operation {}", type, failure);
LOG.error("Failed to execute operation {} due to {}. More details are available on DEBUG level.", type,
Throwables.getRootCause(failure).getMessage());
replyTo.tell(new Failure(failure), self());
}
abstract @NonNull Object nullResponse(@NonNull T type);
abstract @NonNull Object response(@NonNull T type, @NonNull R result);
}
}