SysLogHandler closes tcp session after first message (also noted in #66006)

Bug report

Python 3.10.5
While running FastAPI (Uvicorn) and the SysLogHandler. The Socket if using a TCP stream is being closed after the first message, causing all additional messages to fail stating OSError10083. In looking through the SysLogHandler code I was able to add a try/except that solved the issue by opening a new socket if the current is found to be closed.

Lines 990/991:

else:
    self.socket.sendall(msg)

I changed to:

else:
    try:
        self.socket.sendall(msg)
    except OSError:
        with socket.create_connection(self.address) as s:
            s.sendall(msg)

Your environment

Python 3.10

• CPython versions tested on: 3.10
• Operating system and architecture: Windows 10

SysLogHandler の 990-991 行付近にある TCP 送信分岐から始め、FastAPI と Uvicorn を使用して Windows 10 上の Python 3.10 で失敗を再現してください。TCP ソケットを閉じた後も複数のメッセージの送信が失敗しないことを確認し、リポジトリに関連するテストの場所がある場合は、再接続動作のカバレッジを追加または更新してください。