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/*
* ============LICENSE_START=======================================================
* PNF-REGISTRATION-HANDLER
* ================================================================================
* Copyright (C) 2018 NOKIA Intellectual Property. 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.prh.service;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import java.net.URISyntaxException;
import org.apache.http.client.utils.URIBuilder;
import org.onap.dcaegen2.services.prh.model.EnvProperties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import reactor.core.publisher.Mono;
/**
* @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 8/10/18
*/
@Service
public class PrhConfigurationProvider {
private static final Logger LOGGER = LoggerFactory.getLogger(PrhConfigurationProvider.class);
private final HttpGetClient httpGetClient;
PrhConfigurationProvider() {
this(new HttpGetClient());
}
PrhConfigurationProvider(HttpGetClient httpGetClient) {
this.httpGetClient = httpGetClient;
}
public Mono<JsonObject> callForPrhConfiguration(EnvProperties envProperties) {
return callConsulForConfigBindingServiceEndpoint(envProperties)
.flatMap(this::callConfigBindingServiceForPrhConfiguration);
}
private Mono<String> callConsulForConfigBindingServiceEndpoint(EnvProperties envProperties) {
LOGGER.info("Retrieving Config Binding Service endpoint from Consul");
try {
return httpGetClient.callHttpGet(getConsulUrl(envProperties), JsonArray.class)
.flatMap(jsonArray -> this.createConfigBindingServiceUrl(jsonArray, envProperties.appName()));
} catch (URISyntaxException e) {
LOGGER.warn("Malformed Consul uri", e);
return Mono.error(e);
}
}
private String getConsulUrl(EnvProperties envProperties) throws URISyntaxException {
return getUri(envProperties.consulHost(), envProperties.consulPort(), "/v1/catalog/service",
envProperties.cbsName());
}
private Mono<JsonObject> callConfigBindingServiceForPrhConfiguration(String configBindingServiceUri) {
LOGGER.info("Retrieving PRH configuration");
return httpGetClient.callHttpGet(configBindingServiceUri, JsonObject.class);
}
private Mono<String> createConfigBindingServiceUrl(JsonArray jsonArray, String appName) {
return getConfigBindingObject(jsonArray)
.flatMap(jsonObject -> buildConfigBindingServiceUrl(jsonObject, appName));
}
private Mono<String> buildConfigBindingServiceUrl(JsonObject jsonObject, String appName) {
try {
return Mono.just(getUri(jsonObject.get("ServiceAddress").getAsString(),
jsonObject.get("ServicePort").getAsInt(), "/service_component", appName));
} catch (URISyntaxException e) {
LOGGER.warn("Malformed Config Binding Service uri", e);
return Mono.error(e);
}
}
private Mono<JsonObject> getConfigBindingObject(JsonArray jsonArray) {
try {
if (jsonArray.size() > 0) {
return Mono.just(jsonArray.get(0).getAsJsonObject());
} else {
throw new IllegalStateException("JSON Array was empty");
}
} catch (IllegalStateException e) {
LOGGER.warn("Failed to retrieve JSON Object from array", e);
return Mono.error(e);
}
}
private String getUri(String host, Integer port, String... paths) throws URISyntaxException {
return new URIBuilder()
.setScheme("http")
.setHost(host)
.setPort(port)
.setPath(String.join("/", paths))
.build().toString();
}
}
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