/*
 * Copyright (c) 2020 pig4cloud Authors. 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.
 */

package com.pig4cloud.pig.gateway.config;

import org.springframework.cloud.gateway.filter.ratelimit.KeyResolver;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import reactor.core.publisher.Mono;

import java.util.Objects;

/**
 * 路由限流配置类
 *
 * @author lengleng
 * @date 2019/2/1
 */
@Configuration(proxyBeanMethods = false)
public class RateLimiterConfiguration {

	/**
	 * 创建基于远程地址的KeyResolver实例
	 * @return 根据请求的远程地址生成限流key的KeyResolver
	 * @see <a href=
	 * "https://docs.spring.io/spring-cloud-gateway/docs/current/reference/html/#the-requestratelimiter-gatewayfilter-factory">Spring
	 * Cloud Gateway文档</a>
	 */
	@Bean
	public KeyResolver remoteAddrKeyResolver() {
		return exchange -> Mono
			.just(Objects.requireNonNull(Objects.requireNonNull(exchange.getRequest().getRemoteAddress()))
				.getAddress()
				.getHostAddress());
	}

}
