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add rate limiting per X-Forwarded-For ip
Signed-off-by: Matthias Bertschy <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| package server | ||
|
|
||
| import ( | ||
| "net/http" | ||
| "sync" | ||
|
|
||
| "github.com/didip/tollbooth/v7" | ||
| "github.com/didip/tollbooth/v7/limiter" | ||
| ) | ||
|
|
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| // inspired by https://stackoverflow.com/questions/73439068/limit-max-number-of-requests-per-hour-with-didip-tollbooth | ||
|
|
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| type ConcurrentLimiter struct { | ||
| max int | ||
| current int | ||
| mut sync.Mutex | ||
| } | ||
|
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| func NewConcurrentLimiter(limit int) *ConcurrentLimiter { | ||
| return &ConcurrentLimiter{ | ||
| max: limit, | ||
| } | ||
| } | ||
|
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| func (limiter *ConcurrentLimiter) LimitConcurrentRequests(lmt *limiter.Limiter, | ||
| handler func(http.ResponseWriter, *http.Request)) http.Handler { | ||
| middle := func(w http.ResponseWriter, r *http.Request) { | ||
| limiter.mut.Lock() | ||
| maxHit := limiter.current == limiter.max | ||
| if maxHit { | ||
| limiter.mut.Unlock() | ||
| http.Error(w, http.StatusText(429), http.StatusTooManyRequests) | ||
| return | ||
| } | ||
| limiter.current += 1 | ||
| limiter.mut.Unlock() | ||
| defer func() { | ||
| limiter.mut.Lock() | ||
| limiter.current -= 1 | ||
| limiter.mut.Unlock() | ||
| }() | ||
| // There's no rate-limit error, serve the next handler. | ||
| handler(w, r) | ||
| } | ||
| return tollbooth.LimitHandler(lmt, http.HandlerFunc(middle)) | ||
| } |
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