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/*
* ============LICENSE_START=======================================================
* BBS-RELOCATION-CPE-AUTHENTICATION-HANDLER
* ================================================================================
* Copyright (C) 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.bbs.event.processor.utilities;
import static org.springframework.web.reactive.function.client.ExchangeFilterFunctions.basicAuthentication;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import io.netty.handler.ssl.SslContext;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.net.ssl.SSLException;
import org.onap.bbs.event.processor.config.AaiClientConfiguration;
import org.onap.bbs.event.processor.config.ApplicationConfiguration;
import org.onap.bbs.event.processor.config.ConfigurationChangeObserver;
import org.onap.bbs.event.processor.exceptions.AaiTaskException;
import org.onap.bbs.event.processor.model.PnfAaiObject;
import org.onap.bbs.event.processor.model.ServiceInstanceAaiObject;
import org.onap.dcaegen2.services.sdk.rest.services.ssl.SslFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.reactive.ClientHttpConnector;
import org.springframework.http.client.reactive.ReactorClientHttpConnector;
import org.springframework.stereotype.Component;
import org.springframework.web.reactive.function.client.ClientResponse;
import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Mono;
import reactor.netty.http.client.HttpClient;
@Component
public class AaiReactiveClient implements ConfigurationChangeObserver {
private static final Logger LOGGER = LoggerFactory.getLogger(AaiReactiveClient.class);
private final Gson gson;
private WebClient webClient;
private SslFactory sslFactory;
private final ApplicationConfiguration configuration;
private AaiClientConfiguration aaiClientConfiguration;
@Autowired
AaiReactiveClient(ApplicationConfiguration configuration, Gson gson) throws SSLException {
this.configuration = configuration;
this.gson = gson;
this.sslFactory = new SslFactory();
aaiClientConfiguration = configuration.getAaiClientConfiguration();
setupWebClient();
}
@PostConstruct
public void registerForConfigChanges() {
configuration.register(this);
}
@PreDestroy
public void unRegisterForConfigChanges() {
configuration.unRegister(this);
}
@Override
public void updateConfiguration(ApplicationConfiguration configuration) {
AaiClientConfiguration newConfiguration = configuration.getAaiClientConfiguration();
if (aaiClientConfiguration.equals(newConfiguration)) {
LOGGER.debug("No Configuration changes necessary for AAI Reactive client");
} else {
LOGGER.debug("AAI Reactive client must be re-configured");
aaiClientConfiguration = newConfiguration;
try {
setupWebClient();
} catch (SSLException e) {
LOGGER.error("AAI Reactive client error while re-configuring WebClient");
}
}
}
private synchronized void setupWebClient() throws SSLException {
SslContext sslContext = createSslContext();
ClientHttpConnector reactorClientHttpConnector = new ReactorClientHttpConnector(
HttpClient.create().secure(sslContextSpec -> sslContextSpec.sslContext(sslContext)));
this.webClient = WebClient.builder()
.baseUrl(aaiClientConfiguration.aaiProtocol() + "://" + aaiClientConfiguration.aaiHost()
+ ":" + aaiClientConfiguration.aaiPort())
.clientConnector(reactorClientHttpConnector)
.defaultHeaders(httpHeaders -> httpHeaders.setAll(aaiClientConfiguration.aaiHeaders()))
.filter(basicAuthentication(aaiClientConfiguration.aaiUserName(),
aaiClientConfiguration.aaiUserPassword()))
.filter(logRequest())
.filter(logResponse())
.build();
}
public Mono<PnfAaiObject> getPnfObjectDataFor(String url) {
return performReactiveHttpGet(url, PnfAaiObject.class);
}
public Mono<ServiceInstanceAaiObject> getServiceInstanceObjectDataFor(String url) {
return performReactiveHttpGet(url, ServiceInstanceAaiObject.class);
}
private synchronized <T> Mono<T> performReactiveHttpGet(String url, Class<T> responseType) {
LOGGER.debug("Will issue Reactive GET request to URL ({}) for object ({})", url, responseType.getName());
return webClient
.get()
.uri(url)
.retrieve()
.onStatus(HttpStatus::is4xxClientError,
response -> Mono.error(createExceptionObject(url, response)))
.onStatus(HttpStatus::is5xxServerError,
response -> Mono.error(createExceptionObject(url, response)))
.bodyToMono(String.class)
.flatMap(body -> extractMono(body, responseType));
}
private AaiTaskException createExceptionObject(String url, ClientResponse response) {
return new AaiTaskException(String.format("A&AI Request for (%s) failed with HTTP status code %d", url,
response.statusCode().value()));
}
private <T> Mono<T> extractMono(String body, Class<T> responseType) {
LOGGER.debug("Response body \n{}", body);
try {
return Mono.just(parseFromJsonReply(body, responseType));
} catch (JsonSyntaxException | IllegalStateException e) {
return Mono.error(e);
}
}
private <T> T parseFromJsonReply(String body, Class<T> responseType) {
return gson.fromJson(body, responseType);
}
private static ExchangeFilterFunction logRequest() {
return ExchangeFilterFunction.ofRequestProcessor(clientRequest -> {
LOGGER.debug("Request: {} {}", clientRequest.method(), clientRequest.url());
clientRequest.headers()
.forEach((name, values) -> values.forEach(value -> LOGGER.debug("{}={}", name, value)));
return Mono.just(clientRequest);
});
}
private static ExchangeFilterFunction logResponse() {
return ExchangeFilterFunction.ofResponseProcessor(clientResponse -> {
LOGGER.debug("Response status {}", clientResponse.statusCode());
return Mono.just(clientResponse);
});
}
private SslContext createSslContext() throws SSLException {
if (aaiClientConfiguration.enableAaiCertAuth()) {
return sslFactory.createSecureContext(
aaiClientConfiguration.keyStorePath(),
aaiClientConfiguration.keyStorePasswordPath(),
aaiClientConfiguration.trustStorePath(),
aaiClientConfiguration.trustStorePasswordPath()
);
}
return sslFactory.createInsecureContext();
}
}
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