Hi all, as you might know I'm working on Guile-SSH library [1] that is aimed to provide SSH protocol support for Scheme programs. One of the data types provided by the library is a Guile-SSH channel which can be used for transferring data between SSH client/server.
Currently channels are implemented as simple smobs and Guile-SSH provides a bunch of special procedures for reading/writing data. The problem is that the current implementation allows only to transfer Scheme strings through channels. Obviously that is very limiting because it's often needed to transfer arbitrary data, not only strings. My goal is to improve Guile-SSH channels implementation so it will handle any kinds of Scheme data types. So here is my RFC. Ludovic Courtès proposed to use bytevectors for reading/writing of data as improvement to the current implementation and he sent me a patch that changes `channel-read' procedure so now it returns read data as a bytevector. `examples/sssh.scm' updated as well. The patch was applied on this branch: https://github.com/artyom-poptsov/libguile-ssh/tree/channel-io-improvement-with-bytevectors Meanwhile I've re-implemented Guile-SSH channels using GNU Guile port API. [2] The work is done on `channel-to-ptob' branch: https://github.com/artyom-poptsov/libguile-ssh/tree/channel-to-ptob As a consequence of using port API the most of specific procedures for dealing with channels such as `channel-read', `channel-write', `channel-close' and friends are eliminated, so the API became clearer. I've write a SSH-based echo protocol implementation that uses Guile-SSH to demostrate new API usage: https://github.com/artyom-poptsov/libguile-ssh/tree/channel-to-ptob/examples/echo Tests with transferring of u8 vectors have shown that implemented ports works nicely. I'm going to merge changes from `channel-to-ptob' branch for the next Guile-SSH 0.5.0 release if no one has objections on it. Of course, any comments are welcome. Thanks. - Artyom [1] https://github.com/artyom-poptsov/libguile-ssh [2] https://www.gnu.org/software/guile/docs/docs-1.8/guile-ref/I_002fO-Extensions.html -- Artyom Poptsov <poptsov.art...@gmail.com> Home page: http://poptsov-artyom.narod.ru/ JID: a...@xmpp.ru Nizhny Novgorod Linux Users Group (NNLUG) member: http://nnlug.ru/ CADR hackerspace founder: http://cadrspace.ru/
