Re: [hybi] Max frame size
"Andy Green (林安廸)" <andy@warmcat.com> Wed, 22 June 2011 15:48 UTC
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Date: Wed, 22 Jun 2011 16:48:43 +0100
From: "\"Andy Green (林安廸)\"" <andy@warmcat.com>
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Cc: hybi@ietf.org
Subject: Re: [hybi] Max frame size
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On 06/22/2011 04:35 PM, Somebody in the thread at some point said: Hi - > So, if the frame received is less than 127 or 65535 bytes the server > reads everything, checks header correctness and that the header > represents bits advised, etc, and then pass the data through a handler > to the user level code...but if the data is bigger, you pass a file > descriptor?? There's more than one way to write the code to deal with this, but the way that is immune to running out of buffer space or funny boundary conditions / packet fragmentation fragility is to pass everything through a bytewise state machine, as Willy says treat it strictly as a stream of bytes. Then you really don't care about what size packets it comes in, how big a frame can be, you interpret the frame header as each byte of it comes in and just buffer payload locally using any size buffer or none at all, and spill those up to the guy who takes payload for that kind of frame as it fills up or you see it was the last byte. > This way, the handler is called, for example, each 4k, so the handler > can receive those 5GB with minimum memory allocation and with the > security it handles messages not raw access to a file descriptor (with > the security and code complexity implications it has). I guess you could write it like that but it has other problems, like blocking and timeout management that are handled neatly by having the state machine as the one place for everything. -Andy
- [hybi] Max frame size Francis Brosnan Blázquez
- Re: [hybi] Max frame size Willy Tarreau
- Re: [hybi] Max frame size Norio Kobota
- Re: [hybi] Max frame size Ian Fette (イアンフェッティ)
- Re: [hybi] Max frame size Francis Brosnan Blazquez
- Re: [hybi] Max frame size Francis Brosnan Blazquez
- Re: [hybi] Max frame size Ian Fette (イアンフェッティ)
- Re: [hybi] Max frame size Francis Brosnan Blazquez
- Re: [hybi] Max frame size Francis Brosnan Blazquez
- Re: [hybi] Max frame size Arman Djusupov
- Re: [hybi] Max frame size Willy Tarreau
- Re: [hybi] Max frame size Francis Brosnan Blazquez
- Re: [hybi] Max frame size Andy Green (林安廸)
- Re: [hybi] Max frame size Scott Ferguson
- Re: [hybi] Max frame size Iñaki Baz Castillo
- Re: [hybi] Max frame size Francis Brosnan Blázquez
- Re: [hybi] Max frame size Andy Green (林安廸)
- Re: [hybi] Max frame size Brodie Thiesfield
- Re: [hybi] Max frame size Scott Ferguson