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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* ================================================================================
* 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.policy.apex.plugins.event.carrier.restclient;
import java.util.EnumMap;
import java.util.Map;
import java.util.Properties;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.core.Response;
import org.onap.policy.apex.service.engine.event.ApexEventException;
import org.onap.policy.apex.service.engine.event.ApexEventProducer;
import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
import org.onap.policy.apex.service.engine.event.PeeredReference;
import org.onap.policy.apex.service.engine.event.SynchronousEventCache;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerParameters;
import org.onap.policy.apex.service.parameters.eventhandler.EventHandlerPeeredMode;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Concrete implementation of an Apex event producer that sends events using REST.
*
* @author Joss Armstrong (joss.armstrong@ericsson.com)
*
*/
public class ApexRestClientProducer implements ApexEventProducer {
private static final Logger LOGGER = LoggerFactory.getLogger(ApexRestClientProducer.class);
// The HTTP client that makes a REST call with an event from Apex
private Client client;
// The REST carrier properties
private RestClientCarrierTechnologyParameters restProducerProperties;
// The name for this producer
private String name = null;
// The peer references for this event handler
private Map<EventHandlerPeeredMode, PeeredReference> peerReferenceMap = new EnumMap<>(EventHandlerPeeredMode.class);
/**
* {@inheritDoc}.
*/
@Override
public void init(final String producerName, final EventHandlerParameters producerParameters)
throws ApexEventException {
this.name = producerName;
// Check and get the REST Properties
if (!(producerParameters.getCarrierTechnologyParameters() instanceof RestClientCarrierTechnologyParameters)) {
final String errorMessage =
"specified producer properties are not applicable to REST client producer (" + this.name + ")";
LOGGER.warn(errorMessage);
throw new ApexEventException(errorMessage);
}
restProducerProperties =
(RestClientCarrierTechnologyParameters) producerParameters.getCarrierTechnologyParameters();
// Check if the HTTP method has been set
if (restProducerProperties.getHttpMethod() == null) {
restProducerProperties.setHttpMethod(RestClientCarrierTechnologyParameters.HttpMethod.POST);
}
if (!RestClientCarrierTechnologyParameters.HttpMethod.POST.equals(restProducerProperties.getHttpMethod())
&& !RestClientCarrierTechnologyParameters.HttpMethod.PUT
.equals(restProducerProperties.getHttpMethod())) {
final String errorMessage = "specified HTTP method of \"" + restProducerProperties.getHttpMethod()
+ "\" is invalid, only HTTP methods \"POST\" and \"PUT\" are supproted "
+ "for event sending on REST client producer (" + this.name + ")";
LOGGER.warn(errorMessage);
throw new ApexEventException(errorMessage);
}
// Initialize the HTTP client
client = ClientBuilder.newClient();
}
/**
* {@inheritDoc}.
*/
@Override
public String getName() {
return name;
}
/**
* {@inheritDoc}.
*/
@Override
public PeeredReference getPeeredReference(final EventHandlerPeeredMode peeredMode) {
return peerReferenceMap.get(peeredMode);
}
/**
* {@inheritDoc}.
*/
@Override
public void setPeeredReference(final EventHandlerPeeredMode peeredMode, final PeeredReference peeredReference) {
peerReferenceMap.put(peeredMode, peeredReference);
}
/**
* {@inheritDoc}.
*/
@Override
public void sendEvent(final long executionId, final Properties executionProperties, final String eventName,
final Object event) {
// Check if this is a synchronized event, if so we have received a reply
final SynchronousEventCache synchronousEventCache =
(SynchronousEventCache) peerReferenceMap.get(EventHandlerPeeredMode.SYNCHRONOUS);
if (synchronousEventCache != null) {
synchronousEventCache.removeCachedEventToApexIfExists(executionId);
}
// Send the event as a REST request
final Response response = sendEventAsRestRequest((String) event);
// Check that the request worked
if (response.getStatus() != Response.Status.OK.getStatusCode()) {
final String errorMessage = "send of event to URL \"" + restProducerProperties.getUrl() + "\" using HTTP \""
+ restProducerProperties.getHttpMethod() + "\" failed with status code " + response.getStatus()
+ " and message \"" + response.readEntity(String.class) + "\", event:\n" + event;
LOGGER.warn(errorMessage);
throw new ApexEventRuntimeException(errorMessage);
}
if (LOGGER.isTraceEnabled()) {
LOGGER.trace("event sent from engine using {} to URL {} with HTTP {} : {} and response {} ", this.name,
restProducerProperties.getUrl(), restProducerProperties.getHttpMethod(), event, response);
}
}
/**
* {@inheritDoc}.
*/
@Override
public void stop() {
// Close the HTTP session
client.close();
}
/**
* Send the event as a JSON string as a REST request.
*
* @param event the event to send
* @return the response to the JSON request
*/
private Response sendEventAsRestRequest(final String event) {
// We have already checked that it is a PUT or POST request
if (RestClientCarrierTechnologyParameters.HttpMethod.POST.equals(restProducerProperties.getHttpMethod())) {
return client.target(restProducerProperties.getUrl()).request("application/json")
.headers(restProducerProperties.getHttpHeadersAsMultivaluedMap()).post(Entity.json(event));
} else {
return client.target(restProducerProperties.getUrl()).request("application/json")
.headers(restProducerProperties.getHttpHeadersAsMultivaluedMap()).put(Entity.json(event));
}
}
/**
* Hook for unit test mocking of HTTP client.
*
* @param client the mocked client
*/
protected void setClient(final Client client) {
this.client = client;
}
}
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