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