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/*
* ============LICENSE_START=======================================================
* Copyright (c) 2021-2022 Bell Canada.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.cps.notification;
import java.time.OffsetDateTime;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Future;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import lombok.extern.slf4j.Slf4j;
import org.onap.cps.spi.model.Anchor;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
@Service
@Slf4j
public class NotificationService {
private NotificationProperties notificationProperties;
private NotificationPublisher notificationPublisher;
private CpsDataUpdatedEventFactory cpsDataUpdatedEventFactory;
private NotificationErrorHandler notificationErrorHandler;
private List<Pattern> dataspacePatterns;
/**
* Create an instance of Notification Subscriber.
*
* @param notificationProperties properties for notification
* @param notificationPublisher notification Publisher
* @param cpsDataUpdatedEventFactory to create CPSDataUpdatedEvent
* @param notificationErrorHandler error handler
*/
public NotificationService(
final NotificationProperties notificationProperties,
final NotificationPublisher notificationPublisher,
final CpsDataUpdatedEventFactory cpsDataUpdatedEventFactory,
final NotificationErrorHandler notificationErrorHandler) {
log.info("Notification Properties {}", notificationProperties);
this.notificationProperties = notificationProperties;
this.notificationPublisher = notificationPublisher;
this.cpsDataUpdatedEventFactory = cpsDataUpdatedEventFactory;
this.notificationErrorHandler = notificationErrorHandler;
this.dataspacePatterns = getDataspaceFilterPatterns(notificationProperties);
}
private List<Pattern> getDataspaceFilterPatterns(final NotificationProperties notificationProperties) {
if (notificationProperties.isEnabled()) {
return Arrays.stream(notificationProperties.getFilters()
.getOrDefault("enabled-dataspaces", "")
.split(","))
.map(filterPattern -> Pattern.compile(filterPattern, Pattern.CASE_INSENSITIVE))
.collect(Collectors.toList());
} else {
return Collections.emptyList();
}
}
/**
* Process Data Updated Event and publishes the notification.
*
* @param anchor anchor
* @param observedTimestamp observedTimestamp
* @param xpath xpath of changed data node
* @param operation operation
* @return future
*/
@Async("notificationExecutor")
public Future<Void> processDataUpdatedEvent(final Anchor anchor, final OffsetDateTime observedTimestamp,
final String xpath, final Operation operation) {
log.debug("process data updated event for anchor '{}'", anchor);
try {
if (shouldSendNotification(anchor.getDataspaceName())) {
final var cpsDataUpdatedEvent =
cpsDataUpdatedEventFactory.createCpsDataUpdatedEvent(anchor,
observedTimestamp, getRootNodeOperation(xpath, operation));
log.debug("data updated event to be published {}", cpsDataUpdatedEvent);
notificationPublisher.sendNotification(cpsDataUpdatedEvent);
}
} catch (final Exception exception) {
/* All the exceptions are handled to not to propagate it to caller.
CPS operation should not fail if sending event fails for any reason.
*/
notificationErrorHandler.onException("Failed to process cps-data-updated-event.",
exception, anchor, xpath, operation);
}
return CompletableFuture.completedFuture(null);
}
/*
Add more complex rules based on dataspace and anchor later
*/
private boolean shouldSendNotification(final String dataspaceName) {
return notificationProperties.isEnabled()
&& dataspacePatterns.stream()
.anyMatch(pattern -> pattern.matcher(dataspaceName).find());
}
private Operation getRootNodeOperation(final String xpath, final Operation operation) {
return isRootXpath(xpath) || isRootContainerNodeXpath(xpath) ? operation : Operation.UPDATE;
}
private static boolean isRootXpath(final String xpath) {
return "/".equals(xpath) || "".equals(xpath);
}
private static boolean isRootContainerNodeXpath(final String xpath) {
return 0 == xpath.lastIndexOf('/');
}
}
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