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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2019 Nokia. 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.
* ============LICENSE_END=====================================
*/
package org.onap.dcaegen2.services.sdk.rest.services.cbs.client.impl;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import java.net.InetSocketAddress;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpResponse;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.ImmutableHttpRequest;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.RxHttpClient;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.api.exceptions.ServiceLookupException;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.EnvProperties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Mono;
/**
* @author <a href="mailto:piotr.jaszczyk@nokia.com">Piotr Jaszczyk</a>
* @since February 2019
*/
public class CbsLookup {
private static final Logger LOGGER = LoggerFactory.getLogger(CbsLookup.class);
private static final String CONSUL_JSON_SERVICE_ADDRESS = "ServiceAddress";
private static final String CONSUL_JSON_SERVICE_PORT = "ServicePort";
private final RxHttpClient httpClient;
public CbsLookup(RxHttpClient httpClient) {
this.httpClient = httpClient;
}
public Mono<InetSocketAddress> lookup(EnvProperties env) {
return Mono.fromCallable(() -> createConsulUrl(env))
.doOnNext(this::logConsulRequestUrl)
.flatMap(this::fetchHttpData)
.doOnNext(this::logConsulResponse)
.flatMap(this::firstService)
.map(this::parseServiceEntry)
.doOnNext(this::logCbsServiceAddress);
}
private String createConsulUrl(EnvProperties env) {
return String.format("http://%s:%s/v1/catalog/service/%s", env.consulHost(), env.consulPort(), env.cbsName());
}
private void logConsulRequestUrl(String consulUrl) {
LOGGER.debug("Calling Consul for CBS address. consulUrl={}", consulUrl);
}
private Mono<JsonArray> fetchHttpData(String consulUrl) {
return httpClient.call(
ImmutableHttpRequest.builder()
.method(HttpMethod.GET)
.url(consulUrl)
.build())
.doOnNext(HttpResponse::throwIfUnsuccessful)
.map(resp -> resp.bodyAsJson(JsonArray.class));
}
private void logConsulResponse(JsonArray consulResponse) {
LOGGER.debug("Consul response with CBS service list. Will use 1st one. response={}", consulResponse);
}
private Mono<JsonObject> firstService(JsonArray services) {
return services.size() == 0
? Mono.error(new ServiceLookupException("Consul server did not return any service with given name"))
: Mono.just(services.get(0).getAsJsonObject());
}
private InetSocketAddress parseServiceEntry(JsonObject service) {
return InetSocketAddress.createUnresolved(
service.get(CONSUL_JSON_SERVICE_ADDRESS).getAsString(),
service.get(CONSUL_JSON_SERVICE_PORT).getAsInt());
}
private void logCbsServiceAddress(InetSocketAddress address) {
LOGGER.info("Config Binding Service address: {}", address);
}
}
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