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// Copyright (c) 2021 Dillon Dixon
// Copyright (c) 2023 Tulir Asokan
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
// Package retryafter contains a utility function for parsing the Retry-After HTTP header.
package retryafter
import (
"net/http"
"strconv"
"time"
)
var now = time.Now
// Parse parses the backoff time specified in the Retry-After header if present.
// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Retry-After.
//
// The second parameter is the fallback duration to use if the header is not present or invalid.
//
// Example:
//
// time.Sleep(retryafter.Parse(resp.Header.Get("Retry-After"), 5*time.Second))
func Parse(retryAfter string, fallback time.Duration) time.Duration {
if retryAfter == "" {
return fallback
} else if t, err := time.Parse(http.TimeFormat, retryAfter); err == nil {
return t.Sub(now())
} else if seconds, err := strconv.Atoi(retryAfter); err == nil {
return time.Duration(seconds) * time.Second
}
return fallback
}
// Should returns true if the given status code indicates that the request should be retried.
//
// if retryafter.Should(resp.StatusCode, true) {
// time.Sleep(retryafter.Parse(resp.Header.Get("Retry-After"), 5*time.Second))
// }
func Should(statusCode int, retryOnRateLimit bool) bool {
switch statusCode {
case http.StatusBadGateway, http.StatusServiceUnavailable, http.StatusGatewayTimeout:
return true
case http.StatusTooManyRequests:
return retryOnRateLimit
default:
return false
}
}
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