Fix: The README's rate limiting example throws, and WithRate sile - #14
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📝 WalkthroughWalkthroughThrottle validation now accepts positive burst sizes below ChangesThrottle fixes
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Inline comments:
In `@src/Carom.Extensions/Throttle.cs`:
- Line 123: Restore the ThrottleBuilder.Build() method and the missing closing
XML documentation/content in Throttle.cs so the existing
ResiliencePipelineBuilder call to Throttle.ForService(...).WithRate(...).Build()
continues to compile; alternatively, update every caller consistently, but
preserve the builder API.
- Line 76: Update ExecuteAsync’s ThrottleStore.GetOrCreate call to use the valid
two-argument contract, matching the existing call in Execute and removing the
undeclared serviceKey argument.
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src/Carom.Extensions/Throttle.cs
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Reviewed and ready on the code side. The CLA cannot attach to these commits yet, for the reason and fix set out in #13 — you are already signed, the commits just are not resolvable to your account. Once that is sorted this can go in. |
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Decision on the burst question: your change is right and I am taking it. #15 is merged, so this is the remaining one alongside #13. I want to be explicit that this overrules what I wrote in issue #7, because you should not have to guess whether you are contradicting me on purpose. Why you are rightI read Measured on your branch at
Capacity below rate is the textbook token bucket for smoothing a spiky client, and it preserves throughput completely. The old check rejected precisely that configuration, and the default it forced permits a whole window instantly, which is no smoothing at all. So the README was describing the useful thing and the validation was wrong. Issue #7 prescribed keeping the check. That was my error, written from the parameter names rather than from the state machine. The part that made this easyYou did not remove the validation, you replaced it: - if (burstSize < maxRequests)
+ if (burstSize < 1)That is the right floor. A bucket that can never hold a token is genuinely broken and still fails fast, while the configurations that work are now reachable. If you had deleted the guard outright I would have asked for exactly this back. For anyone reading later: no existing behaviour changes. Every configuration that passed the old check behaves identically. Only previously rejected ones now build. The What I need before mergingTwo tests, because right now the suite does not know about either half of this change. I checked by putting the old code back:
No test calls
Both should fail if you revert your own change. That is the rule the project holds everyone to and it is the only thing standing between this and a merge. One more: the PR title says the README example throws, but the diff never touches Separately, the CLAStill the commit author email from my note on #13. Worth knowing that it does not cost you credit in the end: #15 squash merged as |
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@zacharywomack8-source you are on https://baryo.dev/community and on the org profile at https://github.com/BaryoDev. Written up as the two things that were genuinely worth catching: three Carom packages were being published to NuGet while missing from the solution file, so CI had never once built them, and a test that slept for about fifteen minutes on every run. The first one is the sort of thing that only gets found by someone who actually reads the build rather than trusting the green tick. #15 is merged. #14 has my decision on it: your change is right and I am taking it, including the #13 and #14 are still blocked by the commit author email, which is the thing from my note on #13. Worth knowing it costs you nothing in the end: #15 squash merged as your account email and GitHub attributed it correctly, so your name is on it either way. Thank you. |
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Sorry this sat for a week. The CLA is no longer required here, so nothing is blocking on that any more.
The fix is right, and the _burstSet flag is the correct shape rather than the obvious one. The bug was that WithRate overwrote _burstSize unconditionally, so WithBurst(...).WithRate(...) silently discarded the burst while WithRate(...).WithBurst(...) worked. Tracking whether burst was set explicitly and defaulting only in Build() makes the two order-independent, which is what a fluent builder has to be. Reordering calls should never change the result.
One change needs a sentence of justification
Relaxing burstSize < maxRequests to burstSize < 1 is a deliberate loosening of validation, and it is doing separate work from the builder fix. With the new Build() defaulting burst to maxRequests, the old constraint only bites when someone explicitly asks for a smaller burst.
Is a bucket smaller than the per-window rate meaningful? Arguably yes, it caps concurrent bursts below the sustained rate, but that is a design decision rather than a bug fix, and the PR description does not mention it. Worth a line in the description saying why it is allowed now, so the next person reading the validation does not "restore" it.
What it needs before merge
A test. tests/Carom.Extensions.Tests already exists and neither of these PRs touches it.
Two worth having, and both are a few lines:
WithBurst(50).WithRate(100, per)andWithRate(100, per).WithBurst(50)produce the sameThrottle. That is the actual bug and the test would have failed before this change.- The README example builds without throwing. Since the reported symptom was that the documented example throws, a test that runs the documented example is the guard that stops it regressing.
The second one matters more than it looks: a README that throws is a bug nobody notices until a new user hits it, which is the worst kind.
Five tests for the fix in this PR. Verified they can fail: restoring the WithRate assignment reddens two of them, restoring the burst >= maxRequests validation reddens three. The README example is its own test rather than folded into the ordering ones, so changing the documented example forces a decision here instead of quietly diverging from it.
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Pushed the tests to your branch rather than asking you to, since this had already waited a week and the fix itself was right. Your commits are untouched.
I checked they can fail rather than assuming. Restoring the On the validation change, which I asked you to justifyYou do not need to. I found the justification in var apiThrottle = Throttle.ForService("external-api")
.WithRate(100, TimeSpan.FromSeconds(1))
.WithBurst(20)
.Build();Burst 20 against a rate of 100. The documented, intended usage has always required burst below maxRequests, so the old validation contradicted the documentation rather than enforcing a real invariant. That is a better reason than any I would have written, and it is now pinned by Merging. Thanks for the fix, and sorry it sat. |
3 participants
Fixes #7
Applied LLM-generated fix: Applied LLM-generated fix to src\Carom.Extensions\Throttle.cs
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