/*
 * Copyright 2002-2017 the original author or authors.
 *
 * 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.
 */

package org.springframework.http.client.reactive;

import java.net.URI;
import java.util.function.Consumer;
import java.util.function.Function;

import reactor.core.publisher.Mono;
import reactor.ipc.netty.http.client.HttpClient;
import reactor.ipc.netty.http.client.HttpClientOptions;
import reactor.ipc.netty.http.client.HttpClientRequest;
import reactor.ipc.netty.http.client.HttpClientResponse;
import reactor.ipc.netty.options.ClientOptions;

import org.springframework.http.HttpMethod;

/**
 * Reactor-Netty implementation of {@link ClientHttpConnector}.
 *
 * @author Brian Clozel
 * @since 5.0
 * @see reactor.ipc.netty.http.client.HttpClient
 */
public class ReactorClientHttpConnector implements ClientHttpConnector {

	private static final Mono<ClientHttpResponse> NO_CLIENT_RESPONSE_ERROR = Mono.error(
			new IllegalStateException("HttpClient completed without a response. " +
					"As a temporary workaround try to disable connection pool. " +
					"See https://github.com/reactor/reactor-netty/issues/138."));


	private final HttpClient httpClient;


	/**
	 * Create a Reactor Netty {@link ClientHttpConnector}
	 * with default {@link ClientOptions} and HTTP compression support enabled.
	 */
	public ReactorClientHttpConnector() {
		this.httpClient = HttpClient.builder()
				.options(options -> options.compression(true))
				.build();
	}

	/**
	 * Create a Reactor Netty {@link ClientHttpConnector} with the given
	 * {@link HttpClientOptions.Builder}
	 */
	public ReactorClientHttpConnector(Consumer<? super HttpClientOptions.Builder> clientOptions) {
		this.httpClient = HttpClient.create(clientOptions);
	}


	@Override
	public Mono<ClientHttpResponse> connect(HttpMethod method, URI uri,
			Function<? super ClientHttpRequest, Mono<Void>> requestCallback) {

		if (!uri.isAbsolute()) {
			return Mono.error(new IllegalArgumentException("URI is not absolute: " + uri));
		}

		return this.httpClient
				.request(adaptHttpMethod(method),
						uri.toString(),
						request -> requestCallback.apply(adaptRequest(method, uri, request)))
				.map(this::adaptResponse)
				.switchIfEmpty(NO_CLIENT_RESPONSE_ERROR);
	}

	private io.netty.handler.codec.http.HttpMethod adaptHttpMethod(HttpMethod method) {
		return io.netty.handler.codec.http.HttpMethod.valueOf(method.name());
	}

	private ReactorClientHttpRequest adaptRequest(HttpMethod method, URI uri, HttpClientRequest request) {
		return new ReactorClientHttpRequest(method, uri, request);
	}

	private ClientHttpResponse adaptResponse(HttpClientResponse response) {
		return new ReactorClientHttpResponse(response);
	}

}

@@ -1348,306 +1348,8 @@
  %7B%0A%0A
-%09private static final Mono%3CClientHttpResponse%3E NO_CLIENT_RESPONSE_ERROR = Mono.error(%0A%09%09%09new IllegalStateException(%22HttpClient completed without a response. %22 +%0A%09%09%09%09%09%22As a temporary workaround try to disable connection pool. %22 +%0A%09%09%09%09%09%22See https://github.com/reactor/reactor-netty/issues/138.%22));%0A%0A%0A
 %09pri
@@ -2408,53 +2408,8 @@
 nse)
-%0A%09%09%09%09.switchIfEmpty(NO_CLIENT_RESPONSE_ERROR)
 ;%0A%09%7D

Remove temporary workaround for reactor-netty client