| /** |
| * Copyright 2016-present Open Networking Laboratory |
| * 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. |
| */ |
| package org.onosproject.kafkaintegration.rest; |
| |
| import static com.google.common.base.Preconditions.checkNotNull; |
| import static javax.ws.rs.core.Response.Status.BAD_REQUEST; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import javax.ws.rs.Consumes; |
| import javax.ws.rs.DELETE; |
| import javax.ws.rs.POST; |
| import javax.ws.rs.Path; |
| import javax.ws.rs.Produces; |
| import javax.ws.rs.core.MediaType; |
| import javax.ws.rs.core.Response; |
| |
| import org.onosproject.codec.JsonCodec; |
| import org.onosproject.kafkaintegration.api.EventExporterService; |
| import org.onosproject.kafkaintegration.api.dto.EventSubscriber; |
| import org.onosproject.kafkaintegration.api.dto.EventSubscriberGroupId; |
| import org.onosproject.rest.AbstractWebResource; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| |
| /** |
| * Rest Interfaces for subscribing/unsubscribing to event notifications. |
| */ |
| @Path("kafkaService") |
| public class EventExporterWebResource extends AbstractWebResource { |
| |
| private final Logger log = LoggerFactory.getLogger(getClass()); |
| public static final String JSON_NOT_NULL = "Registration Data cannot be empty"; |
| public static final String REGISTRATION_SUCCESSFUL = "Registered Listener successfully"; |
| public static final String DEREGISTRATION_SUCCESSFUL = "De-Registered Listener successfully"; |
| public static final String EVENT_SUBSCRIPTION_SUCCESSFUL = "Event Registration successfull"; |
| public static final String EVENT_SUBSCRIPTION_REMOVED = "Event De-Registration successfull"; |
| |
| /** |
| * Registers a listener for Onos Events. |
| * |
| * @param appName The application trying to register |
| * @return 200 OK with UUID string which should be used as Kafka Consumer |
| * Group Id |
| * @onos.rsModel KafkaRegistration |
| */ |
| @POST |
| @Produces(MediaType.APPLICATION_JSON) |
| @Consumes(MediaType.APPLICATION_JSON) |
| @Path("register") |
| public Response registerKafkaListener(String appName) { |
| |
| EventExporterService service = get(EventExporterService.class); |
| |
| EventSubscriberGroupId groupId = service.registerListener(appName); |
| |
| log.info("Registered app {}", appName); |
| |
| // TODO: Should also return Kafka server information. |
| // Will glue this in when we have the config and Kafka modules ready |
| return ok(groupId.getId().toString()).build(); |
| } |
| |
| /** |
| * Unregisters a listener for Onos Events. |
| * |
| * @param appName The application trying to unregister |
| * @return 200 OK |
| * @onos.rsModel KafkaRegistration |
| */ |
| @DELETE |
| @Produces(MediaType.APPLICATION_JSON) |
| @Consumes(MediaType.APPLICATION_JSON) |
| @Path("unregister") |
| public Response removeKafkaListener(String appName) { |
| EventExporterService service = get(EventExporterService.class); |
| |
| service.unregisterListener(appName); |
| |
| return ok(DEREGISTRATION_SUCCESSFUL).build(); |
| } |
| |
| /** |
| * Creates subscription to a specific Onos event. |
| * |
| * @param input Subscription Data in Json format |
| * @return 200 OK if successful or 400 BAD REQUEST |
| * @onos.rsModel KafkaSubscription |
| */ |
| @POST |
| @Produces(MediaType.APPLICATION_JSON) |
| @Path("subscribe") |
| public Response subscribe(InputStream input) { |
| |
| EventExporterService service = get(EventExporterService.class); |
| |
| try { |
| EventSubscriber sub = parseSubscriptionData(input); |
| service.subscribe(sub); |
| } catch (Exception e) { |
| log.error(e.getMessage()); |
| return Response.status(BAD_REQUEST).entity(e.getMessage()).build(); |
| } |
| |
| return ok(EVENT_SUBSCRIPTION_SUCCESSFUL).build(); |
| } |
| |
| /** |
| * Parses Json Subscription Data from the external application. |
| * |
| * @param node node within the parsed json tree. |
| * @return parsed DTO object |
| * @throws IOException |
| */ |
| private EventSubscriber parseSubscriptionData(InputStream input) |
| throws IOException { |
| |
| ObjectMapper mapper = new ObjectMapper(); |
| ObjectNode node = (ObjectNode) mapper.readTree(input); |
| |
| checkNotNull(node, JSON_NOT_NULL); |
| |
| JsonCodec<EventSubscriber> codec = codec(EventSubscriber.class); |
| return codec.decode(node, this); |
| } |
| |
| /** |
| * Deletes subscription from a specific Onos event. |
| * |
| * @param input data in json format |
| * @return 200 OK if successful or 400 BAD REQUEST |
| * @onos.rsModel KafkaSubscription |
| */ |
| @DELETE |
| @Produces(MediaType.APPLICATION_JSON) |
| @Path("unsubscribe") |
| public Response unsubscribe(InputStream input) { |
| |
| EventExporterService service = get(EventExporterService.class); |
| |
| try { |
| EventSubscriber sub = parseSubscriptionData(input); |
| service.subscribe(sub); |
| } catch (Exception e) { |
| log.error(e.getMessage()); |
| return Response.status(BAD_REQUEST).entity(e.getMessage()).build(); |
| } |
| |
| return ok(EVENT_SUBSCRIPTION_REMOVED).build(); |
| } |
| } |