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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.Gson;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import org.onap.dcaegen2.services.prh.model.EnvProperties;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Service;
import org.springframework.web.reactive.function.client.ExchangeFilterFunction;
import org.springframework.web.reactive.function.client.WebClient;
import reactor.core.publisher.Mono;
/**
* @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 8/10/18
*/
@Service
public class HttpClientExecutorService {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
public Mono<String> callConsulForConfigBindingServiceEndpoint(EnvProperties envProperties) {
return HttpGetClient.callHttpGet(
envProperties.consulHost() + ":" + envProperties.consulPort() + "/v1/catalog/service/" + envProperties
.cbsName())
.flatMap(this::getJsonArrayFromRequest)
.flatMap(jsonArray -> Mono.just(jsonArray.get(0)))
.flatMap(this::createConfigBindingServiceURL);
}
public Publisher<JsonObject> callConfigBindingServiceForPrhConfiguration(EnvProperties envProperties,
Mono<String> configBindingServiceUri) {
return HttpGetClient.callHttpGet(configBindingServiceUri + "/service_component/" + envProperties.appName())
.flatMap(this::getJsonConfiguration);
}
private Mono<? extends JsonObject> getJsonConfiguration(String body) {
JsonElement jsonElement = new Gson().toJsonTree(body);
try {
return Mono.just(jsonElement.getAsJsonObject());
} catch (IllegalStateException e) {
return Mono.error(e);
}
}
private Mono<String> createConfigBindingServiceURL(JsonElement jsonElement) {
JsonObject jsonObject;
try {
jsonObject = jsonElement.getAsJsonObject();
} catch (IllegalStateException e) {
return Mono.error(e);
}
return Mono.just(jsonObject.get("ServiceAddress").toString() + ":" + jsonObject.get("ServicePort").toString());
}
private Mono<? extends JsonArray> getJsonArrayFromRequest(String body) {
JsonElement jsonElement = new Gson().toJsonTree(body);
try {
return Mono.just(jsonElement.getAsJsonArray());
} catch (IllegalStateException e) {
logger.warn("Converting string to jsonArray threw error: " + e);
return Mono.error(e);
}
}
private static class HttpGetClient {
private static final Logger logger = LoggerFactory.getLogger(HttpGetClient.class);
private static WebClient webClient;
private HttpGetClient() {
}
private static Mono<String> callHttpGet(String url) {
return webClient
.get()
.uri(url)
.retrieve()
.onStatus(HttpStatus::is4xxClientError, response ->
Mono.error(new Exception("Request for cloud config failed: HTTP 400")))
.onStatus(HttpStatus::is5xxServerError, response ->
Mono.error(new Exception("Request for cloud config failed: HTTP 500")))
.bodyToMono(String.class);
}
private static ExchangeFilterFunction logResponse() {
return ExchangeFilterFunction.ofResponseProcessor(clientResponse -> {
logger.info("Response status {}", clientResponse.statusCode());
return Mono.just(clientResponse);
});
}
private static ExchangeFilterFunction logRequest() {
return ExchangeFilterFunction.ofRequestProcessor(clientRequest -> {
logger.info("Request: {} {}", clientRequest.method(), clientRequest.url());
clientRequest.headers()
.forEach((name, values) -> values.forEach(value -> logger.info("{}={}", name, value)));
return Mono.just(clientRequest);
});
}
static {
webClient = WebClient.builder().filter(logRequest()).filter(logResponse()).build();
}
}
}
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