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/*
* ============LICENSE_START====================================
* DCAEGEN2-SERVICES-SDK
* =========================================================
* Copyright (C) 2019-2021 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.netty.handler.codec.http.HttpResponseStatus;
import io.vavr.collection.HashSet;
import io.vavr.collection.Stream;
import io.vavr.control.Option;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.config.RetryConfig;
import org.onap.dcaegen2.services.sdk.rest.services.adapters.http.exceptions.RetryableException;
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;
import reactor.util.retry.Retry;
import reactor.util.retry.RetryBackoffSpec;
import java.util.stream.Collectors;
/**
* @since 1.1.4
*/
public class RxHttpClient {
private static final Logger LOGGER = LoggerFactory.getLogger(RxHttpClient.class);
private final HttpClient httpClient;
private RetryConfig retryConfig;
RxHttpClient(HttpClient httpClient) {
this.httpClient = httpClient;
}
RxHttpClient(HttpClient httpClient, RetryConfig retryConfig) {
this(httpClient);
this.retryConfig = retryConfig;
}
public Mono<HttpResponse> call(HttpRequest request) {
Mono<HttpResponse> httpResponseMono = response(request);
return Option.of(retryConfig)
.map(rc -> retryConfig(rc, request.diagnosticContext()))
.map(httpResponseMono::retryWhen)
.getOrElse(() -> httpResponseMono);
}
ResponseReceiver<?> prepareRequest(HttpRequest request) {
final HttpClient simpleClient = 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)));
final HttpClient theClient = Option.of(request.timeout())
.map(simpleClient::responseTimeout)
.getOrElse(simpleClient);
return prepareBody(request, theClient);
}
private Mono<HttpResponse> response(HttpRequest request) {
return prepareRequest(request)
.responseSingle((resp, content) -> mapResponse(request.url(), resp.status(), content));
}
private Mono<HttpResponse> mapResponse(String url, HttpResponseStatus status, reactor.netty.ByteBufMono content) {
return content.asByteArray()
.defaultIfEmpty(new byte[0])
.map(bytes -> new NettyHttpResponse(url, status, bytes))
.map(this::validatedResponse);
}
private HttpResponse validatedResponse(HttpResponse response) {
if (shouldRetry(response.statusCode())) {
throw new RetryableException(response);
}
return response;
}
private boolean shouldRetry(int code) {
return Option.of(retryConfig)
.map(RetryConfig::retryableHttpResponseCodes)
.getOrElse(HashSet::empty)
.contains(code);
}
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
.headers(hdrs -> hdrs.set(HttpHeaders.TRANSFER_ENCODING_TYPE, HttpHeaders.CHUNKED))
.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()));
}
private RetryBackoffSpec retryConfig(RetryConfig retryConfig, RequestDiagnosticContext context) {
return Retry
.fixedDelay(retryConfig.retryCount(), retryConfig.retryInterval())
.doBeforeRetry(retrySignal -> context.withSlf4jMdc(
LOGGER.isTraceEnabled(), () -> LOGGER.trace("Retry: {}", retrySignal)))
.filter(ex -> isRetryable(retryConfig, ex))
.onRetryExhaustedThrow((retryBackoffSpec, retrySignal) -> retrySignal.failure());
}
private boolean isRetryable(RetryConfig retryConfig, Throwable ex) {
return retryConfig.retryableExceptions()
.toStream()
.exists(clazz -> clazz.isAssignableFrom(ex.getClass()));
}
}
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