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Fix off-by-one errors in rate limiting samples. #613

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Fix off-by-one errors in rate limiting samples. #613

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ad1c3a8
Fix off-by-one error in fixed-window rate limiting sample
kimsey0 Sep 4, 2023
09539f8
Fix off-by-one error in sliding-window rate limiting sample
kimsey0 Sep 4, 2023
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8 changes: 4 additions & 4 deletions docs/develop/dotnet/aspnetcore/rate-limiting/fixed-window/fixed-window.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -114,7 +114,7 @@ The issue we need to contend with here is that this rate-limiting requires atomi
local expiry = tonumber(ARGV[2])
local requests = redis.call('INCR',key)
redis.call('EXPIRE', key, expiry)
if requests < max_requests then
if requests <= max_requests then
return 0
else
return 1
Expand All @@ -126,7 +126,7 @@ Alternatively, StackExchange.Redis contains support for a [more readable mode of
```sh
local requests = redis.call('INCR',@key)
redis.call('EXPIRE', @key, @expiry)
if requests < tonumber(@maxRequests) then
if requests <= tonumber(@maxRequests) then
return 0
else
return 1
Expand All @@ -148,7 +148,7 @@ To run a Lua script with StackExchange.Redis, you need to prepare a script and r
private const string RATE_LIMITER = @"
local requests = redis.call('INCR',@key)
redis.call('EXPIRE', @key, @expiry)
if requests < tonumber(@maxRequests) then
if requests <= tonumber(@maxRequests) then
return 0
else
return 1
Expand Down Expand Up @@ -207,7 +207,7 @@ You will see some of your requests return a `200`, and at least one request retu
HTTP 200, 0.001492 s
HTTP 200, 0.001449 s
HTTP 200, 0.001551 s
{"status":429,"traceId":"00-16e9da63f77c994db719acff5333c509-f79ac0c862c5a04c-00"} HTTP 429, 0.001803 s
HTTP 200, 0.001551 s
{"status":429,"traceId":"00-3d2e4e8af851024db121935705d5425f-0e23eb80eae0d549-00"} HTTP 429, 0.001521 s
{"status":429,"traceId":"00-b5e824c9ebc4f94aa0bda2a414afa936-8020a7b8f2845544-00"} HTTP 429, 0.001475 s
{"status":429,"traceId":"00-bd6237c5d0362a409c436dcffd0d4a7a-87b544534f397247-00"} HTTP 429, 0.001549 s
Expand Down
4 changes: 2 additions & 2 deletions ...op/dotnet/aspnetcore/rate-limiting/sliding-window/index-sliding-rate-limiter.md
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Original file line number Diff line number Diff line change
Expand Up @@ -116,7 +116,7 @@ local trim_time = tonumber(current_time[1]) - @window
redis.call('ZREMRANGEBYSCORE', @key, 0, trim_time)
local request_count = redis.call('ZCARD',@key)

if request_count < tonumber(@max_requests) then
if request_count <= tonumber(@max_requests) then
redis.call('ZADD', @key, current_time[1], current_time[1] .. current_time[2])
redis.call('EXPIRE', @key, @window)
return 0
Expand All @@ -140,7 +140,7 @@ namespace SlidingWindowRateLimiter
redis.call('ZREMRANGEBYSCORE', @key, 0, trim_time)
local request_count = redis.call('ZCARD',@key)

if request_count < tonumber(@max_requests) then
if request_count <= tonumber(@max_requests) then
redis.call('ZADD', @key, current_time[1], current_time[1] .. current_time[2])
redis.call('EXPIRE', @key, @window)
return 0
Expand Down