2 * ============LICENSE_START====================================
3 * DCAEGEN2-SERVICES-SDK
4 * =========================================================
5 * Copyright (C) 2019 Nokia. All rights reserved.
6 * =========================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 * ============LICENSE_END=====================================
21 package org.onap.dcaegen2.services.sdk.rest.services.cbs.client.impl;
23 import com.google.gson.JsonArray;
24 import com.google.gson.JsonObject;
25 import java.net.InetSocketAddress;
26 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
27 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
28 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
29 import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
30 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.exceptions.ServiceLookupException;
31 import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.EnvProperties;
32 import reactor.core.publisher.Mono;
35 * @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
36 * @since February 2019
38 public class CbsLookup {
40 private static final String CONSUL_JSON_SERVICE_ADDRESS = "ServiceAddress";
41 private static final String CONSUL_JSON_SERVICE_PORT = "ServicePort";
42 private final RxHttpClient httpClient;
44 public CbsLookup(RxHttpClient httpClient) {
45 this.httpClient = httpClient;
48 public Mono<InetSocketAddress> lookup(EnvProperties env) {
49 return Mono.fromCallable(() -> createConsulUrl(env))
50 .flatMap(this::fetchHttpData)
51 .flatMap(this::firstService)
52 .map(this::parseServiceEntry);
55 private String createConsulUrl(EnvProperties env) {
56 return String.format("http://%s:%s/v1/catalog/service/%s", env.consulHost(), env.consulPort(), env.cbsName());
59 private Mono<JsonArray> fetchHttpData(String consulUrl) {
60 return httpClient.call(
61 ImmutableHttpRequest.builder()
62 .method(HttpMethod.GET)
65 .doOnNext(HttpResponse::throwIfUnsuccessful)
66 .map(resp -> resp.bodyAsJson(JsonArray.class));
69 private Mono<JsonObject> firstService(JsonArray services) {
70 return services.size() == 0
71 ? Mono.error(new ServiceLookupException("Consul server did not return any service with given name"))
72 : Mono.just(services.get(0).getAsJsonObject());
75 private InetSocketAddress parseServiceEntry(JsonObject service) {
76 return InetSocketAddress.createUnresolved(
77 service.get(CONSUL_JSON_SERVICE_ADDRESS).getAsString(),
78 service.get(CONSUL_JSON_SERVICE_PORT).getAsInt());