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/*
* ============LICENSE_START=======================================================
* DCAEGEN2-SERVICES-SDK
* ================================================================================
* Copyright (C) 2018-2019 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.sdk.rest.services.cbs.client.providers;
import com.google.gson.JsonArray;
import com.google.gson.JsonObject;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpMethod;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.HttpRequest;
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.adapters.http.RxHttpClientFactory;
import org.onap.dcaegen2.services.sdk.rest.services.cbs.client.model.CbsClientConfiguration;
import org.onap.dcaegen2.services.sdk.rest.services.uri.URI;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Mono;
/**
* @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/15/18
*/
public final class ReactiveCloudConfigurationProvider implements CloudConfigurationProvider {
private static final Logger LOGGER = LoggerFactory.getLogger(ReactiveCloudConfigurationProvider.class);
private static final String EXCEPTION_MESSAGE = "Unsupported method call: ";
private final RxHttpClient rxHttpClient;
public ReactiveCloudConfigurationProvider() {
this(RxHttpClientFactory.create());
}
ReactiveCloudConfigurationProvider(RxHttpClient rxHttpClient) {
this.rxHttpClient = rxHttpClient;
}
@Override
public Mono<JsonObject> callForServiceConfigurationReactive(CbsClientConfiguration configuration) {
return callConsulForConfigBindingServiceEndpoint(configuration)
.flatMap(this::callConfigBindingServiceForConfiguration);
}
@Override
public Mono<JsonObject> callForServiceConfigurationReactive(String consulHost, int consulPort, String cbsName,
String appName) {
throw new UnsupportedOperationException(EXCEPTION_MESSAGE + this);
}
@Override
public JsonObject callForServiceConfiguration(String consulHost, int consulPort, String cbsName, String appName) {
throw new UnsupportedOperationException(EXCEPTION_MESSAGE + this);
}
@Override
public JsonObject callForServiceConfiguration(CbsClientConfiguration configuration) {
throw new UnsupportedOperationException(EXCEPTION_MESSAGE + this);
}
private Mono<String> callConsulForConfigBindingServiceEndpoint(CbsClientConfiguration configuration) {
LOGGER.info("Retrieving Config Binding Service endpoint from Consul");
HttpRequest httpRequest = ImmutableHttpRequest.builder()
.url(getConsulUrl(configuration)).method(HttpMethod.GET).build();
return rxHttpClient.call(httpRequest)
.map(resp -> resp.bodyAsJson(JsonArray.class))
.flatMap(jsonArray ->
this.createConfigBindingServiceUrl(
jsonArray,
configuration.appName())
);
}
private String getConsulUrl(CbsClientConfiguration configuration) {
return getUri(configuration.consulHost(), configuration.consulPort(), "/v1/catalog/service",
configuration.cbsName());
}
private Mono<JsonObject> callConfigBindingServiceForConfiguration(String configBindingServiceUri) {
LOGGER.info("Retrieving configuration");
HttpRequest httpRequest = ImmutableHttpRequest.builder()
.url(configBindingServiceUri).method(HttpMethod.GET).build();
return rxHttpClient.call(httpRequest)
.map(httpResponse -> httpResponse.bodyAsJson(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) {
return Mono.just(getUri(jsonObject.get("ServiceAddress").getAsString(),
jsonObject.get("ServicePort").getAsInt(), "/service_component", appName));
}
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) {
return new URI.URIBuilder()
.scheme("http")
.host(host)
.port(port)
.path(String.join("/", paths))
.build().toString();
}
}
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