[DO NOT MERGE] rust: Use SSE for notification endpoints #755
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Rust で SSE を実装する例です。Axum の sse モジュールを使って実装しています。
https://docs.rs/axum/0.7.9/axum/response/sse/index.html
portal-stg で何度かベンチマークを動かしてみましたが
level=ERROR msg=クリティカルエラーが発生しました error="ライドが長時間マッチングされませんでした (CODE=31)"
でまぁまぁの確率で失敗していて、Tokio の worker_threads の数を増やしたりしてみましたが現状そこまで安定してません。ただ、フレームワーク上の問題ではないと思うので SSE 実装ができないわけではないはず……