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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.adapters.http;
import io.vavr.collection.Stream;
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.http.client.HttpClient;
import reactor.netty.http.client.HttpClient.ResponseReceiver;
import reactor.netty.http.client.HttpClientRequest;
import reactor.netty.http.client.HttpClientResponse;
/**
* @since 1.1.4
*/
public class RxHttpClient {
private static final Logger LOGGER = LoggerFactory.getLogger(RxHttpClient.class);
private final HttpClient httpClient;
RxHttpClient(HttpClient httpClient) {
this.httpClient = httpClient;
}
public Mono<HttpResponse> call(HttpRequest request) {
return prepareRequest(request)
.responseSingle((resp, content) ->
content.asByteArray()
.defaultIfEmpty(new byte[0])
.map(bytes -> new NettyHttpResponse(request.url(), resp.status(), bytes)));
}
ResponseReceiver<?> prepareRequest(HttpRequest request) {
final HttpClient theClient = httpClient
.doOnRequest((req, conn) -> logRequest(request.diagnosticContext(), req))
.doOnResponse((rsp, conn) -> logResponse(request.diagnosticContext(), rsp))
.headers(hdrs -> request.headers().forEach(hdr -> hdrs.set(hdr._1, hdr._2)));
return prepareBody(request, theClient);
}
private ResponseReceiver<?> prepareBody(HttpRequest request, HttpClient theClient) {
if (request.body() == null) {
return prepareBodyWithoutContents(request, theClient);
} else {
return request.body().length() == null
? prepareBodyChunked(request, theClient)
: prepareBodyUnchunked(request, theClient);
}
}
private ResponseReceiver<?> prepareBodyChunked(HttpRequest request, HttpClient theClient) {
return theClient
.chunkedTransfer(true)
.request(request.method().asNetty())
.send(request.body().contents())
.uri(request.url());
}
private ResponseReceiver<?> prepareBodyUnchunked(HttpRequest request, HttpClient theClient) {
return theClient
.headers(hdrs -> hdrs.set(HttpHeaders.CONTENT_LENGTH, request.body().length().toString()))
.request(request.method().asNetty())
.send(request.body().contents())
.uri(request.url());
}
private ResponseReceiver<?> prepareBodyWithoutContents(HttpRequest request, HttpClient theClient) {
return theClient
.request(request.method().asNetty())
.uri(request.url());
}
private void logRequest(RequestDiagnosticContext context, HttpClientRequest httpClientRequest) {
context.withSlf4jMdc(LOGGER.isDebugEnabled(), () -> {
LOGGER.debug("Request: {} {} {}", httpClientRequest.method(), httpClientRequest.uri(),
httpClientRequest.requestHeaders());
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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