How to build multi-connection / multi-stream non-blocking QUIC server #29036
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I am writing a QUIC server based on OpenSSL 3.6 and studied the demo application I want to use an application-wide epoll / select event loop and successfully added the listener to it. I believe the demo app circumvents this problem by only serving one client at a time so it does not need a system-wide event loop that dispatches events to the corresponding connection handlers. But this is not an option for a real world server app. My question is: |
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you want to use SSL_poll() for QUIC. As you've noted, multiple QUIC connections, if accepted from the same listener, will share an underlying UDP socket, so its not possible to tell from the epoll return which client has pending events. SSL_poll() manages this by testing each QUIC connections read and write buffers for available data. You can see an example of how this is done, its available in ./demos/quic/poll-server/ |
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Thanks for pointing me to the poll-server demo app, that was really helpful! Does |
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unfortunately, no. Because many SSL_objects may share a single UDP socket, the only way to determine events, is for SSL_poll to call the corresponding reacors tick method to receive data on the socket, which gets routed to the proper connection, and then query each SSL_object for available data. You can certainly combine the two, i.e. epoll the UDP sockets fd for any available data, and then run SSL_poll to determine which connection that data was meant for. |
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you want to use SSL_poll() for QUIC. As you've noted, multiple QUIC connections, if accepted from the same listener, will share an underlying UDP socket, so its not possible to tell from the epoll return which client has pending events. SSL_poll() manages this by testing each QUIC connections read and write buffers for available data. You can see an example of how this is done, its available in ./demos/quic/poll-server/