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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2019 Nokia. 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.impl.adapters;
import com.google.gson.Gson;
import io.netty.handler.codec.http.HttpStatusClass;
import io.vavr.collection.Stream;
import java.io.IOException;
import java.util.function.BiConsumer;
import java.util.stream.Collectors;
import org.onap.dcaegen2.services.sdk.rest.services.model.logging.RequestDiagnosticContext;
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 = new Gson();
private final HttpClient httpClient;
public CloudHttpClient() {
this(HttpClient.create());
}
CloudHttpClient(HttpClient httpClient) {
this.httpClient = httpClient;
}
public <T> Mono<T> get(String url, RequestDiagnosticContext context, Class<T> bodyClass) {
final HttpClient clientWithHeaders = httpClient
.doOnRequest((req, conn) -> logRequest(context, req))
.doOnResponse((rsp, conn) -> logResponse(context, rsp))
.headers(hdrs -> context.remoteCallHttpHeaders().forEach((BiConsumer<String, String>) hdrs::set));
return callHttpGet(clientWithHeaders, url, bodyClass);
}
public <T> Mono<T> get(String url, Class<T> bodyClass) {
return callHttpGet(httpClient, url, bodyClass);
}
private <T> Mono<T> callHttpGet(HttpClient client, String url, Class<T> bodyClass) {
return client.get()
.uri(url)
.responseSingle((resp, content) -> HttpStatusClass.SUCCESS.contains(resp.status().code())
? content.asString()
: Mono.error(createException(url, resp)))
.map(body -> parseJson(body, bodyClass));
}
private Exception createException(String url, HttpClientResponse response) {
return new IOException(String.format("Request failed for URL '%s'. Response code: %s",
url,
response.status()));
}
private <T> T parseJson(String body, Class<T> bodyClass) {
return gson.fromJson(body, bodyClass);
}
private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
LOGGER.debug("Request: {} {}", httpClientRequest.method(), httpClientRequest.uri());
if (LOGGER.isTraceEnabled()) {
final String headers = Stream.ofAll(httpClientRequest.requestHeaders())
.map(entry -> entry.getKey() + "=" + entry.getValue())
.collect(Collectors.joining("\n"));
LOGGER.trace(headers);
}
});
}
private void logResponse(RequestDiagnosticContext context, HttpClientResponse httpClientResponse) {
context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
LOGGER.debug("Response status: {}", httpClientResponse.status());
});
}
}
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