Edit D:\xinhaisoft\crisis_new\api\node_modules\@azure\ms-rest-js\lib\policies\throttlingRetryPolicy.ts

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See License.txt in the project root for license information.

import { BaseRequestPolicy, RequestPolicy, RequestPolicyOptions, RequestPolicyFactory } from "./requestPolicy";
import { WebResource } from "../webResource";
import { HttpOperationResponse } from "../httpOperationResponse";
import { Constants } from "../util/constants";
import { delay } from "../util/utils";

type ResponseHandler = (httpRequest: WebResource, response: HttpOperationResponse) => Promise<HttpOperationResponse>;
const StatusCodes = Constants.HttpConstants.StatusCodes;

export function throttlingRetryPolicy(): RequestPolicyFactory {
  return {
    create: (nextPolicy: RequestPolicy, options: RequestPolicyOptions) => {
      return new ThrottlingRetryPolicy(nextPolicy, options);
    }
  };
}

/**
 * To learn more, please refer to
 * https://docs.microsoft.com/en-us/azure/azure-resource-manager/resource-manager-request-limits,
 * https://docs.microsoft.com/en-us/azure/azure-subscription-service-limits and
 * https://docs.microsoft.com/en-us/azure/virtual-machines/troubleshooting/troubleshooting-throttling-errors
 */
export class ThrottlingRetryPolicy extends BaseRequestPolicy {
  private _handleResponse: ResponseHandler;

constructor(nextPolicy: RequestPolicy, options: RequestPolicyOptions, _handleResponse?: ResponseHandler) {
    super(nextPolicy, options);
    this._handleResponse = _handleResponse || this._defaultResponseHandler;
  }

public async sendRequest(httpRequest: WebResource): Promise<HttpOperationResponse> {
    return this._nextPolicy.sendRequest(httpRequest.clone()).then(response => {
      if (response.status !== StatusCodes.TooManyRequests) {
        return response;
      } else {
        return this._handleResponse(httpRequest, response);
      }
    });
  }

private async _defaultResponseHandler(httpRequest: WebResource, httpResponse: HttpOperationResponse): Promise<HttpOperationResponse> {
    const retryAfterHeader: string | undefined = httpResponse.headers.get(Constants.HeaderConstants.RETRY_AFTER);

if (retryAfterHeader) {
      const delayInMs: number | undefined = ThrottlingRetryPolicy.parseRetryAfterHeader(retryAfterHeader);
      if (delayInMs) {
        return delay(delayInMs).then((_: any) => this._nextPolicy.sendRequest(httpRequest));
      }
    }

return httpResponse;
  }

public static parseRetryAfterHeader(headerValue: string): number | undefined {
    const retryAfterInSeconds = Number(headerValue);
    if (Number.isNaN(retryAfterInSeconds)) {
      return ThrottlingRetryPolicy.parseDateRetryAfterHeader(headerValue);
    } else {
      return retryAfterInSeconds * 1000;
    }
  }

public static parseDateRetryAfterHeader(headerValue: string): number | undefined {
    try {
      const now: number = Date.now();
      const date: number = Date.parse(headerValue);
      const diff = date - now;

return Number.isNaN(diff) ? undefined : diff;
    } catch (error) {
      return undefined;
    }
  }
}

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