"use strict";
// Copyright 2018, Google, LLC.
// 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.
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
Object.defineProperty(exports, "__esModule", { value: true });
function getRetryConfig(err) {
    return __awaiter(this, void 0, void 0, function* () {
        let config = getConfig(err);
        if ((!err || !err.config) || (!config && !err.config.retry)) {
            return { shouldRetry: false };
        }
        config = config || {};
        config.currentRetryAttempt = config.currentRetryAttempt || 0;
        config.retry =
            (config.retry === undefined || config.retry === null) ? 3 : config.retry;
        config.retryDelay = config.retryDelay || 100;
        config.httpMethodsToRetry =
            config.httpMethodsToRetry || ['GET', 'HEAD', 'PUT', 'OPTIONS', 'DELETE'];
        config.noResponseRetries = (config.noResponseRetries === undefined ||
            config.noResponseRetries === null) ?
            2 :
            config.noResponseRetries;
        // If this wasn't in the list of status codes where we want
        // to automatically retry, return.
        const retryRanges = [
            // https://en.wikipedia.org/wiki/List_of_HTTP_status_codes
            // 1xx - Retry (Informational, request still processing)
            // 2xx - Do not retry (Success)
            // 3xx - Do not retry (Redirect)
            // 4xx - Do not retry (Client errors)
            // 429 - Retry ("Too Many Requests")
            // 5xx - Retry (Server errors)
            [100, 199], [429, 429], [500, 599]
        ];
        config.statusCodesToRetry = config.statusCodesToRetry || retryRanges;
        // Put the config back into the err
        err.config.retryConfig = config;
        // Determine if we should retry the request
        const shouldRetryFn = config.shouldRetry || shouldRetryRequest;
        if (!shouldRetryFn(err)) {
            return { shouldRetry: false, config: err.config };
        }
        // Calculate time to wait with exponential backoff.
        // Formula: (2^c - 1 / 2) * 1000
        const delay = (Math.pow(2, config.currentRetryAttempt) - 1) / 2 * 1000;
        // We're going to retry!  Incremenent the counter.
        err.config.retryConfig.currentRetryAttempt += 1;
        // Create a promise that invokes the retry after the backOffDelay
        const backoff = new Promise(resolve => {
            setTimeout(resolve, delay);
        });
        // Notify the user if they added an `onRetryAttempt` handler
        if (config.onRetryAttempt) {
            config.onRetryAttempt(err);
        }
        // Return the promise in which recalls Gaxios to retry the request
        yield backoff;
        return { shouldRetry: true, config: err.config };
    });
}
exports.getRetryConfig = getRetryConfig;
/**
 * Determine based on config if we should retry the request.
 * @param err The GaxiosError passed to the interceptor.
 */
function shouldRetryRequest(err) {
    const config = getConfig(err);
    // If there's no config, or retries are disabled, return.
    if (!config || config.retry === 0) {
        return false;
    }
    // Check if this error has no response (ETIMEDOUT, ENOTFOUND, etc)
    if (!err.response &&
        ((config.currentRetryAttempt || 0) >= config.noResponseRetries)) {
        return false;
    }
    // Only retry with configured HttpMethods.
    if (!err.config.method ||
        config.httpMethodsToRetry.indexOf(err.config.method.toUpperCase()) < 0) {
        return false;
    }
    // If this wasn't in the list of status codes where we want
    // to automatically retry, return.
    if (err.response && err.response.status) {
        let isInRange = false;
        for (const [min, max] of config.statusCodesToRetry) {
            const status = err.response.status;
            if (status >= min && status <= max) {
                isInRange = true;
                break;
            }
        }
        if (!isInRange) {
            return false;
        }
    }
    // If we are out of retry attempts, return
    config.currentRetryAttempt = config.currentRetryAttempt || 0;
    if (config.currentRetryAttempt >= config.retry) {
        return false;
    }
    return true;
}
/**
 * Acquire the raxConfig object from an GaxiosError if available.
 * @param err The Gaxios error with a config object.
 */
function getConfig(err) {
    if (err && err.config && err.config.retryConfig) {
        return err.config.retryConfig;
    }
    return;
}
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