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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 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.dcaegen2.services.pmmapper.datarouter;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.google.gson.JsonParseException;
import io.undertow.util.HeaderValues;
import lombok.Data;
import lombok.NonNull;
import org.onap.dcaegen2.services.pmmapper.exceptions.NoMetadataException;
import org.onap.dcaegen2.services.pmmapper.exceptions.TooManyTriesException;
import org.onap.dcaegen2.services.pmmapper.model.EventMetadata;
import org.onap.dcaegen2.services.pmmapper.model.MapperConfig;
import org.onap.dcaegen2.services.pmmapper.model.Event;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.StatusCodes;
import org.onap.dcaegen2.services.pmmapper.utils.HttpServerExchangeAdapter;
import org.onap.dcaegen2.services.pmmapper.utils.RequiredFieldDeserializer;
import org.onap.logging.ref.slf4j.ONAPLogAdapter;
import org.onap.logging.ref.slf4j.ONAPLogConstants;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.nio.charset.StandardCharsets;
import java.time.Instant;
import java.util.Map;
import java.util.Optional;
import java.util.Random;
import java.util.UUID;
/**
* Subscriber for events sent from data router
* Provides an undertow HttpHandler to be used as an endpoint for data router to send events to.
*/
@Data
public class DataRouterSubscriber implements HttpHandler {
private static final ONAPLogAdapter logger = new ONAPLogAdapter(LoggerFactory.getLogger(DataRouterSubscriber.class));
private static final int NUMBER_OF_ATTEMPTS = 5;
private static final int DEFAULT_TIMEOUT = 2000;
private static final int MAX_JITTER = 50;
private static final String METADATA_HEADER = "X-ATT-DR-META";
private static final String BAD_METADATA_MESSAGE = "Malformed Metadata.";
private static final String NO_METADATA_MESSAGE = "Missing Metadata.";
private boolean limited = false;
private Random jitterGenerator;
private Gson metadataBuilder;
@NonNull
private EventReceiver eventReceiver;
/**
* @param eventReceiver receiver for any inbound events.
*/
public DataRouterSubscriber(EventReceiver eventReceiver) {
this.eventReceiver = eventReceiver;
this.jitterGenerator = new Random();
this.metadataBuilder = new GsonBuilder().registerTypeAdapter(EventMetadata.class, new RequiredFieldDeserializer<EventMetadata>())
.create();
}
/**
* Starts data flow by subscribing to data router through bus controller.
*
* @param config configuration object containing bus controller endpoint for subscription and
* all non constant configuration for subscription through this endpoint.
* @throws TooManyTriesException in the event that timeout has occurred several times.
*/
public void start(MapperConfig config) throws TooManyTriesException, InterruptedException {
try {
logger.unwrap().info(ONAPLogConstants.Markers.ENTRY, "Starting subscription to DataRouter");
subscribe(NUMBER_OF_ATTEMPTS, DEFAULT_TIMEOUT, config);
} finally {
logger.unwrap().info(ONAPLogConstants.Markers.EXIT, "");
}
}
private HttpURLConnection getBusControllerConnection(MapperConfig config, int timeout) throws IOException {
HttpURLConnection connection = (HttpURLConnection) config.getBusControllerSubscriptionUrl()
.openConnection();
connection.setRequestMethod("POST");
connection.setConnectTimeout(timeout);
connection.setReadTimeout(timeout);
connection.setRequestProperty("Content-Type", "application/json");
connection.setDoOutput(true);
final UUID invocationID = logger.invoke(ONAPLogConstants.InvocationMode.SYNCHRONOUS);
final UUID requestID = UUID.randomUUID();
connection.setRequestProperty(ONAPLogConstants.Headers.REQUEST_ID, requestID.toString());
connection.setRequestProperty(ONAPLogConstants.Headers.INVOCATION_ID, invocationID.toString());
connection.setRequestProperty(ONAPLogConstants.Headers.PARTNER_NAME, MapperConfig.CLIENT_NAME);
return connection;
}
private JsonObject getBusControllerSubscribeBody(MapperConfig config) {
JsonObject subscriberObj = new JsonObject();
subscriberObj.addProperty("dcaeLocationName", config.getDcaeLocation());
subscriberObj.addProperty("deliveryURL", config.getBusControllerDeliveryUrl());
subscriberObj.addProperty("feedId", config.getBusControllerFeedId());
subscriberObj.addProperty("lastMod", Instant.now().toString());
subscriberObj.addProperty("username", config.getBusControllerUserName());
subscriberObj.addProperty("userpwd", config.getBusControllerPassword());
return subscriberObj;
}
private void subscribe(int attempts, int timeout, MapperConfig config) throws TooManyTriesException, InterruptedException {
int subResponse = 504;
String subMessage = "";
try {
HttpURLConnection connection = getBusControllerConnection(config, timeout);
try (OutputStream bodyStream = connection.getOutputStream();
OutputStreamWriter bodyWriter = new OutputStreamWriter(bodyStream, StandardCharsets.UTF_8)) {
bodyWriter.write(getBusControllerSubscribeBody(config).toString());
}
subResponse = connection.getResponseCode();
subMessage = connection.getResponseMessage();
} catch (IOException e) {
logger.unwrap().error("Timeout Failure:", e);
}
logger.unwrap().info("Request to bus controller executed with Response Code: '{}' and Response Event: '{}'.", subResponse, subMessage);
if (subResponse >= 300 && attempts > 1) {
Thread.sleep(timeout);
subscribe(--attempts, (timeout * 2) + jitterGenerator.nextInt(MAX_JITTER), config);
} else if (subResponse >= 300) {
throw new TooManyTriesException("Failed to subscribe within appropriate amount of attempts");
}
}
/**
* Receives inbound requests, verifies that required headers are valid
* and passes an Event onto the eventReceiver.
* The forwarded httpServerExchange response is the responsibility of the eventReceiver.
*
* @param httpServerExchange inbound http server exchange.
*/
@Override
public void handleRequest(HttpServerExchange httpServerExchange) {
try{
logger.entering(new HttpServerExchangeAdapter(httpServerExchange));
if (limited) {
httpServerExchange.setStatusCode(StatusCodes.SERVICE_UNAVAILABLE)
.getResponseSender()
.send(StatusCodes.SERVICE_UNAVAILABLE_STRING);
} else {
try {
String metadataAsString = Optional.of(httpServerExchange.getRequestHeaders()
.get(METADATA_HEADER))
.map((HeaderValues headerValues) -> headerValues.get(0))
.orElseThrow(() -> new NoMetadataException("Metadata Not found"));
Map<String,String> mdc = MDC.getCopyOfContextMap();
EventMetadata metadata = metadataBuilder.fromJson(metadataAsString, EventMetadata.class);
httpServerExchange.getRequestReceiver()
.receiveFullString((callbackExchange, body) -> {
httpServerExchange.dispatch(() -> eventReceiver.receive(new Event(callbackExchange, body, metadata, mdc)));
});
} catch (NoMetadataException exception) {
logger.unwrap().info("Bad Request: no metadata found under '{}' header.", METADATA_HEADER, exception);
httpServerExchange.setStatusCode(StatusCodes.BAD_REQUEST)
.getResponseSender()
.send(NO_METADATA_MESSAGE);
} catch (JsonParseException exception) {
logger.unwrap().info("Bad Request: Failure to parse metadata", exception);
httpServerExchange.setStatusCode(StatusCodes.BAD_REQUEST)
.getResponseSender()
.send(BAD_METADATA_MESSAGE);
}
}
} finally {
logger.exiting();
}
}
}
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