41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
package ratelimit
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import (
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"errors"
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"strconv"
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"time"
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)
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const defaultRetryAfter = 1 * time.Minute
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var errInvalidRetryAfter = errors.New("invalid input")
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// parseRetryAfter parses a string s as in the standard Retry-After HTTP header
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// and returns a deadline until when requests are rate limited and therefore new
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// requests should not be sent. The input may be either a date or a non-negative
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// integer number of seconds.
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//
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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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// parseRetryAfter always returns a usable deadline, even in case of an error.
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//
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// This is the original rate limiting mechanism used by Sentry, superseeded by
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// the X-Sentry-Rate-Limits response header.
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func parseRetryAfter(s string, now time.Time) (Deadline, error) {
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if s == "" {
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goto invalid
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}
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if n, err := strconv.Atoi(s); err == nil {
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if n < 0 {
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goto invalid
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}
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d := time.Duration(n) * time.Second
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return Deadline(now.Add(d)), nil
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}
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if date, err := time.Parse(time.RFC1123, s); err == nil {
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return Deadline(date), nil
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}
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invalid:
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return Deadline(now.Add(defaultRetryAfter)), errInvalidRetryAfter
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}
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