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SupervisorLiveChannelDispatching.java
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SupervisorLiveChannelDispatching.java
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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.things.service.persistence.actors;
import java.time.Duration;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.CompletionStage;
import java.util.function.BiFunction;
import java.util.function.Function;
import java.util.function.UnaryOperator;
import org.eclipse.ditto.base.model.headers.DittoHeaders;
import org.eclipse.ditto.base.model.headers.WithDittoHeaders;
import org.eclipse.ditto.base.model.signals.Signal;
import org.eclipse.ditto.base.model.signals.SignalWithEntityId;
import org.eclipse.ditto.base.model.signals.UnsupportedSignalException;
import org.eclipse.ditto.base.model.signals.commands.CommandResponse;
import org.eclipse.ditto.base.model.signals.commands.exceptions.CommandTimeoutException;
import org.eclipse.ditto.internal.utils.akka.logging.ThreadSafeDittoLoggingAdapter;
import org.eclipse.ditto.internal.utils.persistentactors.DistributedPubWithMessage;
import org.eclipse.ditto.internal.utils.persistentactors.TargetActorWithMessage;
import org.eclipse.ditto.internal.utils.pubsub.DistributedPub;
import org.eclipse.ditto.internal.utils.pubsub.StreamingType;
import org.eclipse.ditto.internal.utils.pubsub.extractors.AckExtractor;
import org.eclipse.ditto.internal.utils.pubsubthings.LiveSignalPub;
import org.eclipse.ditto.messages.model.signals.commands.MessageCommand;
import org.eclipse.ditto.policies.enforcement.config.EnforcementConfig;
import org.eclipse.ditto.things.model.signals.commands.ThingCommand;
import org.eclipse.ditto.things.model.signals.commands.query.ThingQueryCommand;
import org.eclipse.ditto.things.model.signals.events.ThingEvent;
import akka.actor.ActorRef;
import akka.actor.ActorRefFactory;
import akka.pattern.AskTimeoutException;
/**
* Functionality used in {@link ThingSupervisorActor} for dispatching {@code "live"} channel messages.
*/
final class SupervisorLiveChannelDispatching {
private static final Duration MIN_LIVE_TIMEOUT = Duration.ofSeconds(1L);
private static final Duration DEFAULT_LIVE_TIMEOUT = Duration.ofSeconds(60L);
private static final AckExtractor<ThingCommand<?>> THING_COMMAND_ACK_EXTRACTOR =
AckExtractor.of(ThingCommand::getEntityId, ThingCommand::getDittoHeaders);
private static final AckExtractor<ThingEvent<?>> THING_EVENT_ACK_EXTRACTOR =
AckExtractor.of(ThingEvent::getEntityId, ThingEvent::getDittoHeaders);
private static final AckExtractor<MessageCommand<?, ?>> MESSAGE_COMMAND_ACK_EXTRACTOR =
AckExtractor.of(MessageCommand::getEntityId, MessageCommand::getDittoHeaders);
private final ThreadSafeDittoLoggingAdapter log;
private final EnforcementConfig enforcementConfig;
private final ResponseReceiverCache responseReceiverCache;
private final LiveSignalPub liveSignalPub;
private final ActorRefFactory actorRefFactory;
SupervisorLiveChannelDispatching(final ThreadSafeDittoLoggingAdapter log,
final EnforcementConfig enforcementConfig,
final ResponseReceiverCache responseReceiverCache,
final LiveSignalPub liveSignalPub,
final ActorRefFactory actorRefFactory) {
this.log = log;
this.enforcementConfig = enforcementConfig;
this.responseReceiverCache = responseReceiverCache;
this.liveSignalPub = liveSignalPub;
this.actorRefFactory = actorRefFactory;
}
/**
* Dispatches the passed in {@code thingQueryCommand} to the "live" channel applying the global dispatching of live
* responses if globally configured via {@link EnforcementConfig#shouldDispatchGlobally(Signal)}.
* Creates a new Actor {@link LiveResponseAndAcknowledgementForwarder} as child of the configured
* {@code actorRefFactory} of this instance which is responsible for aggregating live responses and for forwarding
* acknowledgements.
*
* @param thingQueryCommand the command to handle as "live" query command
* @param responseHandler a response handler function creating the instance of {@link TargetActorWithMessage} the
* returned CompletionStage will be completed with
* @return a CompletionStage which will be completed with a target actor and a message to send to this target actor
*/
CompletionStage<TargetActorWithMessage> dispatchLiveChannelThingQueryCommand(
final ThingQueryCommand<?> thingQueryCommand,
final BiFunction<ThingQueryCommand<?>, ActorRef, TargetActorWithMessage> responseHandler) {
if (enforcementConfig.shouldDispatchGlobally(thingQueryCommand)) {
return responseReceiverCache.insertResponseReceiverConflictFree(thingQueryCommand,
this::createLiveResponseReceiverActor,
responseHandler
);
} else {
final var receiver = createLiveResponseReceiverActor(thingQueryCommand);
return CompletableFuture.completedStage(responseHandler.apply(thingQueryCommand, receiver));
}
}
/**
* Creates the default response handler function creating an instance of {@link TargetActorWithMessage} based on
* a {@code thingQueryCommand} and a receiver of a for pub/sub prepared, wrapped message.
*
* @param thingQueryCommand the command to prepare for publishing via pub/sub
* @param receiver the receiver of the pub/sub message
* @return a target actor and a for pub/sub prepared to send to this target actor to
*/
TargetActorWithMessage prepareForPubSubPublishing(final ThingQueryCommand<?> thingQueryCommand,
final ActorRef receiver) {
return prepareForPubSubPublishing(thingQueryCommand, receiver,
response -> handleEncounteredAskTimeoutsAsCommandTimeoutException(thingQueryCommand.getDittoHeaders(),
response));
}
/**
* Creates the default response handler function creating an instance of {@link TargetActorWithMessage} based on
* a {@code thingQueryCommand} and a receiver of a for pub/sub prepared, wrapped message.
*
* @param thingQueryCommand the command to prepare for publishing via pub/sub
* @param receiver the receiver of the pub/sub message
* @param responseOrErrorConverter a converter function which takes responses and {@link Throwable} errors and
* to create a response from, e.g. in order to convert responses or translate technical exceptions like an
* {@code AskTimeoutException} to a DittoRuntimeException instead
* @return a target actor and a for pub/sub prepared to send to this target actor to
*/
TargetActorWithMessage prepareForPubSubPublishing(final ThingQueryCommand<?> thingQueryCommand,
final ActorRef receiver,
final UnaryOperator<Object> responseOrErrorConverter) {
final var timeout = calculateLiveChannelTimeout(thingQueryCommand.getDittoHeaders());
final var pub = liveSignalPub.command();
final var publish = pub.wrapForPublicationWithAcks(thingQueryCommand, THING_COMMAND_ACK_EXTRACTOR);
return new TargetActorWithMessage(
receiver,
publish,
timeout,
responseOrErrorConverter
);
}
/**
* Dispatches the passed in {@code signal} by preparing it for the "live" channel applying the global dispatching
* of live responses if globally configured via {@link EnforcementConfig#shouldDispatchGlobally(Signal)}.
*
* @param signal the signal to publish via the "live" channel via pub/sub
* @param sender the original sender
* @return a CompletionStage which will be completed with a target actor and a message to send to this target actor
*/
CompletionStage<TargetActorWithMessage> dispatchLiveSignal(final Signal<?> signal, final ActorRef sender) {
final UnaryOperator<Object> errorHandler =
response -> handleEncounteredAskTimeoutsAsCommandTimeoutException(signal.getDittoHeaders(), response);
final DistributedPubWithMessage distributedPubWithMessage = selectLiveSignalPublisher(signal);
if (enforcementConfig.shouldDispatchGlobally(signal)) {
return responseReceiverCache.insertResponseReceiverConflictFree(signal,
newSignal -> sender,
(newSignal, receiver) -> {
log.withCorrelationId(newSignal)
.info("Publishing message to pub-sub: <{}>", newSignal.getType());
if (newSignal.equals(signal)) {
return distributedPubWithMessage;
} else {
return selectLiveSignalPublisher(newSignal);
}
})
.thenApply(distributedPub -> new TargetActorWithMessage(
distributedPub.pub().getPublisher(),
distributedPub.wrappedSignalForPublication(),
calculateLiveChannelTimeout(distributedPub.signal().getDittoHeaders()),
errorHandler
));
} else {
log.withCorrelationId(signal)
.debug("Publish message to pub-sub: <{}>", signal);
return CompletableFuture.completedStage(new TargetActorWithMessage(
distributedPubWithMessage.pub().getPublisher(),
distributedPubWithMessage.wrappedSignalForPublication(),
calculateLiveChannelTimeout(signal.getDittoHeaders()),
errorHandler
));
}
}
private static Duration calculateLiveChannelTimeout(final DittoHeaders dittoHeaders) {
if (dittoHeaders.isResponseRequired()) {
return dittoHeaders.getTimeout().orElse(DEFAULT_LIVE_TIMEOUT);
} else {
return Duration.ZERO;
}
}
/**
* Dispatches the passed in {@code commandResponse} which was received as "live" response globally without knowing
* the sender of the command by using the {@code responseReceiverCache} to find out the originating sender and
* sending it back.
*
* @param commandResponse the global "live" command response to dispatch
* @return a CompletionStage which will be completed with a target actor and a message to send to this target actor
*/
CompletionStage<TargetActorWithMessage> dispatchGlobalLiveCommandResponse(
final CommandResponse<?> commandResponse) {
return WithDittoHeaders.getCorrelationId(commandResponse).map(correlationId ->
dispatchLiveCommandResponse(commandResponse, correlationId)
).orElseGet(() -> CompletableFuture.completedStage(null));
}
private CompletionStage<TargetActorWithMessage> dispatchLiveCommandResponse(
final CommandResponse<?> liveResponse,
final CharSequence correlationId) {
final CompletionStage<TargetActorWithMessage> result;
if (enforcementConfig.isDispatchLiveResponsesGlobally()) {
result = returnCommandResponseContext(liveResponse, correlationId);
} else {
log.withCorrelationId(liveResponse)
.warning("Got live response when global dispatching is inactive: <{}>", liveResponse.getType());
result = CompletableFuture.completedFuture(null);
}
return result;
}
private CompletionStage<TargetActorWithMessage> returnCommandResponseContext(
final CommandResponse<?> liveResponse,
final CharSequence correlationId) {
return responseReceiverCache.get(correlationId)
.thenApply(responseReceiverEntry -> {
final TargetActorWithMessage targetActorWithMessage;
if (responseReceiverEntry.isPresent()) {
final var receiver = responseReceiverEntry.get();
log.withCorrelationId(liveResponse)
.info("Responding with 'live' CommandResponse type <{}> to original sender <{}>",
liveResponse.getType(), receiver);
targetActorWithMessage = new TargetActorWithMessage(receiver.sender(),
liveResponse,
Duration.ZERO,
// ZERO duration means that no "ask" is used, but "tell" - not expecting an answer
Function.identity()
);
} else {
log.withCorrelationId(liveResponse)
.warning("Got <{}> with unknown correlation ID: <{}>", liveResponse.getType(),
correlationId);
targetActorWithMessage = null;
}
return targetActorWithMessage;
});
}
private Object handleEncounteredAskTimeoutsAsCommandTimeoutException(final DittoHeaders dittoHeaders,
final Object response) {
if (response instanceof Throwable t) {
Throwable throwable = t;
if (t instanceof CompletionException completionException) {
throwable = completionException.getCause();
}
if (throwable instanceof AskTimeoutException askTimeoutException) {
return CommandTimeoutException.newBuilder(calculateLiveChannelTimeout(dittoHeaders))
.cause(askTimeoutException)
.dittoHeaders(dittoHeaders)
.build();
} else {
return response;
}
} else {
return response;
}
}
private ActorRef createLiveResponseReceiverActor(final ThingQueryCommand<?> thingQueryCommand) {
final var pub = liveSignalPub.command();
final var props = LiveResponseAndAcknowledgementForwarder.props(thingQueryCommand, pub.getPublisher());
// and start the actor using the provided actorRefFactory
return actorRefFactory.actorOf(props);
}
private static ThingCommand<?> adjustTimeout(final ThingCommand<?> signal, final Duration adjustedTimeout) {
return signal.setDittoHeaders(
signal.getDittoHeaders()
.toBuilder()
.timeout(adjustedTimeout)
.build()
);
}
private DistributedPubWithMessage selectLiveSignalPublisher(final Signal<?> enforcedSignal) {
final var streamingType = StreamingType.fromSignal(enforcedSignal);
if (streamingType.isPresent()) {
switch (streamingType.get()) {
case MESSAGES -> {
final DistributedPub<SignalWithEntityId<?>> pubM = liveSignalPub.message();
return new DistributedPubWithMessage(pubM,
wrapLiveSignal((MessageCommand<?, ?>) enforcedSignal, MESSAGE_COMMAND_ACK_EXTRACTOR, pubM),
enforcedSignal
);
}
case LIVE_EVENTS -> {
final DistributedPub<ThingEvent<?>> pubE = liveSignalPub.event();
return new DistributedPubWithMessage(pubE,
wrapLiveSignal((ThingEvent<?>) enforcedSignal, THING_EVENT_ACK_EXTRACTOR, pubE),
enforcedSignal
);
}
case LIVE_COMMANDS -> {
final DistributedPub<ThingCommand<?>> pubC = liveSignalPub.command();
return new DistributedPubWithMessage(pubC,
wrapLiveSignal((ThingCommand<?>) enforcedSignal, THING_COMMAND_ACK_EXTRACTOR, pubC),
enforcedSignal
);
}
default -> {
// empty
}
}
}
log.withCorrelationId(enforcedSignal)
.warning("Ignoring unsupported signal: <{}>", enforcedSignal);
throw UnsupportedSignalException.newBuilder(enforcedSignal.getType())
.message("The sent command is not supported as live command")
.dittoHeaders(enforcedSignal.getDittoHeaders())
.build();
}
private <T extends Signal<?>, S extends T> Object wrapLiveSignal(final S signal,
final AckExtractor<S> ackExtractor, final DistributedPub<T> pub) {
return pub.wrapForPublicationWithAcks(signal, ackExtractor);
}
}