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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2016-2018 Ericsson. All rights reserved.
* Modifications Copyright (C) 2019-2020 Nordix 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.apex.plugins.event.carrier.restrequestor;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.Properties;
import java.util.Set;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.ws.rs.client.Client;
import javax.ws.rs.client.ClientBuilder;
import javax.ws.rs.client.Entity;
import javax.ws.rs.client.Invocation.Builder;
import javax.ws.rs.core.Response;
import org.apache.commons.lang3.StringUtils;
import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;
import org.onap.policy.apex.service.engine.event.ApexEventException;
import org.onap.policy.apex.service.engine.event.ApexEventReceiver;
import org.onap.policy.apex.service.engine.event.ApexEventRuntimeException;
import org.onap.policy.apex.service.engine.event.ApexPluginsEventConsumer;
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;
/**
* This class implements an Apex event consumer that issues a REST request and returns the REST response to APEX as an
* event.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
public class ApexRestRequestorConsumer extends ApexPluginsEventConsumer {
// Get a reference to the logger
private static final Logger LOGGER = LoggerFactory.getLogger(ApexRestRequestorConsumer.class);
// The amount of time to wait in milliseconds between checks that the consumer thread has
// stopped
private static final long REST_REQUESTOR_WAIT_SLEEP_TIME = 50;
// The Key for property
private static final String HTTP_CODE_STATUS = "HTTP_CODE_STATUS";
// The REST parameters read from the parameter service
private RestRequestorCarrierTechnologyParameters restConsumerProperties;
// The timeout for REST requests
private long restRequestTimeout = RestRequestorCarrierTechnologyParameters.DEFAULT_REST_REQUEST_TIMEOUT;
// The event receiver that will receive events from this consumer
private ApexEventReceiver eventReceiver;
// The HTTP client that makes a REST call to get an input event for Apex
private Client client;
// Temporary request holder for incoming REST requests
private final BlockingQueue<ApexRestRequest> incomingRestRequestQueue = new LinkedBlockingQueue<>();
// Map of ongoing REST request threads indexed by the time they started at
private final Map<ApexRestRequest, RestRequestRunner> ongoingRestRequestMap = new ConcurrentHashMap<>();
// The number of events received to date
private Object eventsReceivedLock = new Object();
private Integer eventsReceived = 0;
// The number of the next request runner thread
private static long nextRequestRunnerThreadNo = 0;
private String untaggedUrl = null;
// The pattern for filtering status code
private Pattern httpCodeFilterPattern = null;
@Override
public void init(final String consumerName, final EventHandlerParameters consumerParameters,
final ApexEventReceiver incomingEventReceiver) throws ApexEventException {
this.eventReceiver = incomingEventReceiver;
this.name = consumerName;
// Check and get the REST Properties
if (!(consumerParameters
.getCarrierTechnologyParameters() instanceof RestRequestorCarrierTechnologyParameters)) {
final String errorMessage =
"specified consumer properties are not applicable to REST Requestor consumer (" + this.name + ")";
throw new ApexEventException(errorMessage);
}
restConsumerProperties =
(RestRequestorCarrierTechnologyParameters) consumerParameters.getCarrierTechnologyParameters();
// Check if we are in peered mode
if (!consumerParameters.isPeeredMode(EventHandlerPeeredMode.REQUESTOR)) {
final String errorMessage = "REST Requestor consumer (" + this.name
+ ") must run in peered requestor mode with a REST Requestor producer";
throw new ApexEventException(errorMessage);
}
// Check if the HTTP method has been set
if (restConsumerProperties.getHttpMethod() == null) {
restConsumerProperties
.setHttpMethod(RestRequestorCarrierTechnologyParameters.DEFAULT_REQUESTOR_HTTP_METHOD);
}
// Check if the HTTP URL has been set
if (restConsumerProperties.getUrl() == null) {
final String errorMessage = "no URL has been specified on REST Requestor consumer (" + this.name + ")";
throw new ApexEventException(errorMessage);
}
// Check if the HTTP URL is valid
try {
new URL(restConsumerProperties.getUrl());
} catch (final Exception e) {
final String errorMessage = "invalid URL has been specified on REST Requestor consumer (" + this.name + ")";
throw new ApexEventException(errorMessage, e);
}
this.httpCodeFilterPattern = Pattern.compile(restConsumerProperties.getHttpCodeFilter());
// Set the requestor timeout
if (consumerParameters.getPeerTimeout(EventHandlerPeeredMode.REQUESTOR) != 0) {
restRequestTimeout = consumerParameters.getPeerTimeout(EventHandlerPeeredMode.REQUESTOR);
}
// Check if HTTP headers has been set
if (restConsumerProperties.checkHttpHeadersSet()) {
final String httpHeaderString = Arrays.deepToString(restConsumerProperties.getHttpHeaders());
LOGGER.debug("REST Requestor consumer has http headers ({}): {}", this.name, httpHeaderString);
}
// Initialize the HTTP client
client = ClientBuilder.newClient();
}
/**
* Receive an incoming REST request from the peered REST Requestor producer and queue it.
*
* @param restRequest the incoming rest request to queue
* @throws ApexEventRuntimeException on queueing errors
*/
public void processRestRequest(final ApexRestRequest restRequest) {
// Push the event onto the queue for handling
try {
incomingRestRequestQueue.add(restRequest);
} catch (final Exception requestException) {
final String errorMessage =
"could not queue request \"" + restRequest + "\" on REST Requestor consumer (" + this.name + ")";
throw new ApexEventRuntimeException(errorMessage);
}
}
/**
* Get the number of events received to date.
*
* @return the number of events received
*/
public int getEventsReceived() {
return eventsReceived;
}
/**
* {@inheritDoc}.
*/
@Override
public void run() {
// The endless loop that receives events using REST calls
while (consumerThread.isAlive() && !stopOrderedFlag) {
try {
// Take the next event from the queue
final ApexRestRequest restRequest =
incomingRestRequestQueue.poll(REST_REQUESTOR_WAIT_SLEEP_TIME, TimeUnit.MILLISECONDS);
if (restRequest == null) {
// Poll timed out, check for request timeouts
timeoutExpiredRequests();
continue;
}
Properties inputExecutionProperties = restRequest.getExecutionProperties();
untaggedUrl = restConsumerProperties.getUrl();
if (inputExecutionProperties != null) {
Set<String> names = restConsumerProperties.getKeysFromUrl();
Set<String> inputProperty = inputExecutionProperties.stringPropertyNames();
names.stream().map(Optional::of)
.forEach(op -> op.filter(inputProperty::contains)
.orElseThrow(() -> new ApexEventRuntimeException(
"key\"" + op.get() + "\"specified on url \"" + restConsumerProperties.getUrl()
+ "\"not found in execution properties passed by the current policy")));
untaggedUrl = names.stream().reduce(untaggedUrl,
(acc, str) -> acc.replace("{" + str + "}", (String) inputExecutionProperties.get(str)));
}
// Set the time stamp of the REST request
restRequest.setTimestamp(System.currentTimeMillis());
// Create a thread to process the REST request and place it on the map of ongoing
// requests
final RestRequestRunner restRequestRunner = new RestRequestRunner(restRequest);
ongoingRestRequestMap.put(restRequest, restRequestRunner);
// Start execution of the request
final Thread restRequestRunnerThread = new Thread(restRequestRunner);
restRequestRunnerThread.setName("RestRequestRunner_" + nextRequestRunnerThreadNo);
restRequestRunnerThread.start();
} catch (final InterruptedException e) {
LOGGER.debug("Thread interrupted, Reason {}", e.getMessage());
Thread.currentThread().interrupt();
}
}
client.close();
}
/**
* This method times out REST requests that have expired.
*/
private void timeoutExpiredRequests() {
// Hold a list of timed out requests
final List<ApexRestRequest> timedoutRequestList = new ArrayList<>();
// Check for timeouts
for (final Entry<ApexRestRequest, RestRequestRunner> requestEntry : ongoingRestRequestMap.entrySet()) {
if (System.currentTimeMillis() - requestEntry.getKey().getTimestamp() > restRequestTimeout) {
requestEntry.getValue().stop();
timedoutRequestList.add(requestEntry.getKey());
}
}
// Interrupt timed out requests and remove them from the ongoing map
for (final ApexRestRequest timedoutRequest : timedoutRequestList) {
final String errorMessage =
"REST Requestor consumer (" + this.name + "), REST request timed out: " + timedoutRequest;
LOGGER.warn(errorMessage);
ongoingRestRequestMap.remove(timedoutRequest);
}
}
/**
* {@inheritDoc}.
*/
@Override
public void stop() {
stopOrderedFlag = true;
while (consumerThread.isAlive()) {
ThreadUtilities.sleep(REST_REQUESTOR_WAIT_SLEEP_TIME);
}
}
/**
* This class is used to start a thread for each request issued.
*
* @author Liam Fallon (liam.fallon@ericsson.com)
*/
private class RestRequestRunner implements Runnable {
private static final String APPLICATION_JSON = "application/json";
// The REST request being processed by this thread
private final ApexRestRequest request;
// The thread executing the REST request
private Thread restRequestThread;
/**
* Constructor, initialise the request runner with the request.
*
* @param request the request this runner will issue
*/
private RestRequestRunner(final ApexRestRequest request) {
this.request = request;
}
/**
* {@inheritDoc}.
*/
@Override
public void run() {
// Get the thread for the request
restRequestThread = Thread.currentThread();
try {
// Execute the REST request
final Response response = sendEventAsRestRequest(untaggedUrl);
// Match the return code
Matcher isPass = httpCodeFilterPattern.matcher(String.valueOf(response.getStatus()));
// Check that the request worked
if (!isPass.matches()) {
final String errorMessage = "reception of event from URL \"" + restConsumerProperties.getUrl()
+ "\" failed with status code " + response.getStatus() + " and message \""
+ response.readEntity(String.class) + "\"";
throw new ApexEventRuntimeException(errorMessage);
}
// Get the event we received
final String eventJsonString = response.readEntity(String.class);
// Check there is content
if (StringUtils.isBlank(eventJsonString)) {
final String errorMessage =
"received an empty response to \"" + request + "\" from URL \"" + untaggedUrl + "\"";
throw new ApexEventRuntimeException(errorMessage);
}
// build a key and value property in excutionProperties
Properties executionProperties = new Properties();
executionProperties.put(HTTP_CODE_STATUS, response.getStatus());
// Send the event into Apex
eventReceiver.receiveEvent(request.getExecutionId(), executionProperties, eventJsonString);
synchronized (eventsReceivedLock) {
eventsReceived++;
}
} catch (final Exception e) {
LOGGER.warn("error receiving events on thread {}", consumerThread.getName(), e);
} finally {
// Remove the request from the map of ongoing requests
ongoingRestRequestMap.remove(request);
}
}
/**
* Stop the REST request.
*/
private void stop() {
restRequestThread.interrupt();
}
/**
* Execute the REST request.
*
*
* @return the response to the REST request
*/
public Response sendEventAsRestRequest(String untaggedUrl) {
Builder headers = client.target(untaggedUrl).request(APPLICATION_JSON)
.headers(restConsumerProperties.getHttpHeadersAsMultivaluedMap());
switch (restConsumerProperties.getHttpMethod()) {
case GET:
return headers.get();
case PUT:
return headers.put(Entity.json(request.getEvent()));
case POST:
return headers.post(Entity.json(request.getEvent()));
case DELETE:
return headers.delete();
default:
break;
}
return null;
}
}
}
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