[release/8.0] SignalR performance: track groups per connection, remove on disconnect#53862

Merged

wtgodbe merged 9 commits intorelease/8.0from

backport/pr-53486-to-release/8.0

Feb 12, 2024

Commits on Feb 7, 2024

SignalR: track groups per connection, remove on disconnect, fixes dotnet/aspnetcore#48249 Instead of iterating over ALL the groups, which is slow and even introduces a DDoS vector, we remove from g…

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Removed unused method

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Apply suggestions from code review

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More code review suggestions with a minor fix

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Use lock instead of ToArray (the latter iterates anyway)

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Made the HashSet an internal property on HubConnectionContext

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Removed unneeded "using"

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Removed ignore-case from group tracking

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Addressed race condition from code review

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