mirror of
https://git.sr.ht/~phw/scotty
synced 2025-06-01 19:38:34 +02:00
61 lines
2 KiB
Go
61 lines
2 KiB
Go
/*
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Copyright © 2023-2025 Philipp Wolfer <phw@uploadedlobster.com>
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Scotty is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later version.
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Scotty is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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Scotty. If not, see <https://www.gnu.org/licenses/>.
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*/
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// Helper functions to set up rate limiting with resty.
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package ratelimit
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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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"github.com/go-resty/resty/v2"
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)
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const (
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RetryCount = 5
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DefaultRateLimitWait = 5 * time.Second
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MaxWaitTime = 60 * time.Second
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)
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// Implements rate HTTP header based limiting for resty.
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//
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// This works with servers that return the status code 429 (Too Many Requests)
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// and an HTTP header indicating the time in seconds until rate limit resets.
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// Common headers used are "X-RateLimit-Reset-In" or "Retry-After".
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//
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// Usage:
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//
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// ratelimit.EnableHTTPHeaderRateLimit(client, "Retry-After")
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func EnableHTTPHeaderRateLimit(client *resty.Client, resetInHeader string) {
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client.SetRetryCount(RetryCount)
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client.AddRetryCondition(
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func(r *resty.Response, err error) bool {
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code := r.StatusCode()
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return code == http.StatusTooManyRequests || code >= http.StatusInternalServerError
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},
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)
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client.SetRetryMaxWaitTime(MaxWaitTime)
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client.SetRetryAfter(func(client *resty.Client, resp *resty.Response) (time.Duration, error) {
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retryAfter := DefaultRateLimitWait
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if resp.StatusCode() == http.StatusTooManyRequests {
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retryAfterHeader, err := strconv.Atoi(resp.Header().Get(resetInHeader))
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if err == nil {
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retryAfter = time.Duration(retryAfterHeader) * time.Second
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}
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}
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return retryAfter, nil
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})
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}
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