content: /*
   * Copyright 1999-2023 Alibaba Group Holding Ltd.
   *
   * 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.alibaba.nacos.naming.utils;
  
  import com.alibaba.nacos.api.exception.NacosException;
  import com.alibaba.nacos.api.exception.api.NacosApiException;
  import com.alibaba.nacos.api.model.v2.ErrorCode;
  import com.alibaba.nacos.api.remote.request.RequestMeta;
  import com.alibaba.nacos.common.utils.StringUtils;
  import com.alibaba.nacos.core.context.RequestContextHolder;
  import com.alibaba.nacos.core.context.addition.AddressContext;
  import com.alibaba.nacos.core.utils.WebUtils;
  import jakarta.servlet.http.HttpServletRequest;
  import org.springframework.http.HttpStatus;
  
  /**
   * Naming request util.
   *
   * @author xiweng.yy
   */
  public class NamingRequestUtil {
      
      /**
       * Get source ip from request context.
       *
       * @return source ip, null if not found
       */
      public static String getSourceIp() {
          AddressContext addressContext = RequestContextHolder.getContext().getBasicContext().getAddressContext();
          String sourceIp = addressContext.getSourceIp();
          if (StringUtils.isBlank(sourceIp)) {
              sourceIp = addressContext.getRemoteIp();
          }
          return sourceIp;
      }
      
      /**
       * Get source ip from request context first, if it can't found, get from http request.
       *
       * @param httpServletRequest http request
       * @return source ip, null if not found
       */
      public static String getSourceIpForHttpRequest(HttpServletRequest httpServletRequest) {
          String sourceIp = getSourceIp();
          // If can't get from request context, get from http request.
          if (StringUtils.isBlank(sourceIp)) {
              sourceIp = WebUtils.getRemoteIp(httpServletRequest);
          }
          return sourceIp;
      }
      
      /**
       * Get source ip from request context first, if it can't found, get from http request.
       *
       * @param meta grpc request meta
       * @return source ip, null if not found
       */
      public static String getSourceIpForGrpcRequest(RequestMeta meta) {
          String sourceIp = getSourceIp();
          // If can't get from request context, get from grpc request meta.
          if (StringUtils.isBlank(sourceIp)) {
              sourceIp = meta.getClientIp();
          }
          return sourceIp;
      }
      
      /**
       * Check request weight is validate.
       *
       * @param weight weight from request
       * @throws NacosException if weight is invalid
       */
      public static void checkWeight(Double weight) throws NacosException {
          if (weight > com.alibaba.nacos.naming.constants.Constants.MAX_WEIGHT_VALUE
                  || weight < com.alibaba.nacos.naming.constants.Constants.MIN_WEIGHT_VALUE) {
              throw new NacosApiException(HttpStatus.BAD_REQUEST.value(), ErrorCode.WEIGHT_ERROR,
                      "instance format invalid: The weights range from "
                              + com.alibaba.nacos.naming.constants.Constants.MIN_WEIGHT_VALUE + " to "
                              + com.alibaba.nacos.naming.constants.Constants.MAX_WEIGHT_VALUE);
          }
      }
  }
  