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Add middleware for request prioritization (#33951)

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This adds a middleware for overload protection that is intended to help protect against malicious scrapers.
It does this via [`codel`](https://github.com/bohde/codel), which will perform the following:

1. Limit the number of in-flight requests to some user-defined max
2. When in-flight requests have reached their begin queuing requests.
    Logged-in requests having priority above logged-out requests
3. Once a request has been queued for too long,
    it has a probabilistic chance to be rejected based on how overloaded the entire system is.

When a server experiences more traffic than it can handle,
this keeps latency low for logged-in users and rejects just
enough requests from logged-out users to not overload the service.

---------

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Giteabot <teabot@gitea.io>
This commit is contained in:
Rowan Bohde
2025-04-14 09:25:48 -05:00
committed by GitHub
parent 3a9fcac11b
commit c57304ac3f
10 changed files with 301 additions and 2 deletions
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23
custom/conf/app.example.ini
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@@ -940,7 +940,29 @@ LEVEL = Info
;;
;; Disable the code explore page.
;DISABLE_CODE_PAGE = false
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;[qos]
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Enable request quality of service and overload protection.
; ENABLED = false
;;
;; The maximum number of concurrent requests that the server will
;; process before enqueueing new requests. Default is "CpuNum * 4".
; MAX_INFLIGHT =
;;
;; The maximum number of requests that can be enqueued before new
;; requests will be dropped.
; MAX_WAITING = 100
;;
;; Target maximum wait time a request may be enqueued for. Requests
;; that are enqueued for less than this amount of time will not be
;; dropped. When wait times exceed this amount, a portion of requests
;; will be dropped until wait times have decreased below this amount.
; TARGET_WAIT_TIME = 250ms
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -1423,7 +1445,6 @@ LEVEL = Info
;; or use comma separated list: inline-dollar, inline-parentheses, block-dollar, block-square-brackets
;; Defaults to "inline-dollar,block-dollar" to follow GitHub's behavior.
;MATH_CODE_BLOCK_DETECTION =
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;