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/*
* ============LICENSE_START=======================================================
* DCAEGEN2-SERVICES-SDK
* ================================================================================
* 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.sdk.rest.services.cbs.client.http.configuration;
import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;
import java.util.function.BiConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import reactor.core.publisher.Mono;
import reactor.netty.Connection;
import reactor.netty.http.client.HttpClient;
import reactor.netty.http.client.HttpClientRequest;
import reactor.netty.http.client.HttpClientResponse;
/**
* @author <a href="mailto:przemyslaw.wasala@nokia.com">Przemysław Wąsala</a> on 11/15/18
*/
public class CloudHttpClient {
private static final Logger LOGGER = LoggerFactory.getLogger(CloudHttpClient.class);
private final Gson gson;
private final HttpClient httpClient;
public CloudHttpClient() {
this(HttpClient.create().doOnRequest(logRequest()).doOnResponse(logResponse()));
}
CloudHttpClient(HttpClient httpClient) {
this.gson = new Gson();
this.httpClient = httpClient;
}
public <T> Mono<T> callHttpGet(String url, Class<T> genericClassDeclaration) {
return httpClient
.baseUrl(url)
.doOnResponseError(doOnError())
.get()
.responseSingle(
(httpClientResponse, content) -> getJsonFromRequest(content.toString(), genericClassDeclaration));
}
private BiConsumer<HttpClientResponse, Throwable> doOnError() {
return (httpClientResponse, throwable) -> {
Mono.error(getException(httpClientResponse));
};
}
private RuntimeException getException(HttpClientResponse response) {
return new RuntimeException(String.format("Request for cloud config failed: HTTP %d",
response.status().code()));
}
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 BiConsumer<HttpClientRequest, Connection> logRequest() {
return (httpClientRequest, connection) -> {
LOGGER.debug("Request: {} {}", httpClientRequest.method(), httpClientRequest.uri());
httpClientRequest.requestHeaders().forEach(stringStringEntry -> {
LOGGER.trace("{}={}", stringStringEntry.getKey(), stringStringEntry.getValue());
});
};
}
private static BiConsumer<? super HttpClientResponse, ? super Connection> logResponse() {
return (httpClientresponse, connection) -> {
LOGGER.debug("Response status: {}", httpClientresponse.status());
};
}
}
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