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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.JsonSyntaxException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
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;
class HttpGetClient {
private static final Logger LOGGER = LoggerFactory.getLogger(HttpGetClient.class);
private final WebClient webClient;
private final Gson gson;
HttpGetClient() {
this(WebClient.builder().filter(logRequest()).filter(logResponse()).build());
}
HttpGetClient(WebClient webClient) {
this.webClient = webClient;
this.gson = new Gson();
}
<T> Mono<T> callHttpGet(String url, Class<T> genericClassDeclaration) {
return webClient
.get()
.uri(url)
.retrieve()
.onStatus(HttpStatus::is4xxClientError, response -> Mono.error(getException(response)))
.onStatus(HttpStatus::is5xxServerError, response -> Mono.error(getException(response)))
.bodyToMono(String.class)
.flatMap(body -> getJsonFromRequest(body, genericClassDeclaration));
}
private RuntimeException getException(ClientResponse response) {
return new RuntimeException(String.format("Request for cloud config failed: HTTP %d",
response.statusCode().value()));
}
private <T> Mono<T> getJsonFromRequest(String body, Class<T> genericClassDeclaration) {
try {
return Mono.just(parseJson(body, genericClassDeclaration));
} catch (JsonSyntaxException | IllegalStateException e) {
return Mono.error(e);
}
}
private <T> T parseJson(String body, Class<T> genericClassDeclaration) {
return gson.fromJson(body, genericClassDeclaration);
}
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);
});
}
}
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