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indieterminacy at libre.brussels indieterminacy at libre.brussels
Tue Oct 5 14:42:59 BST 2021
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Omar Polo <op at omarpolo.com> writes:
Hello,
One of the things that I love about text/gemini is how it's easy to
parse, and being it line-based it's also really easy to stream it. When
I started working on telescope, the idea of being able to stream content
was present in the design of the parser from the first draft -- it also
fit nicely with separation in multiple processes (one process does the
fetching, another one the rendering, and messages are sent from one proc
to the other.) But other than knowing from the code that it should
work, I never played with this aspect of text/gemini.
Fast forward various months, I've just watched the "Why gemini" video by
Tomasino and I got an urge to build something with streaming text. I'm
attaching a very, very simple CGI script that streams text/gemini to
build an interactive chatroom.
The idea is similar to the one presented by solderpunk in "A vision for
gemini applications"
gemini://gemini.circumlunar.space/users/solderpunk/gemlog/a-vision-for-gemini-applications.gmi
and, frankly, I'm quite disappointed nobody has built something like
this before. (or at least I haven't been able to find it. I know
kensanata has made some experiments with a mush, but I haven't played
with it (yet))
The idea is to provide two pages: one that accepts input via the
response code 10 and appends to a file, the second is a literal `tail
-f'. Simple, but it works, and it's immediate. As soon as someone
sends something, all the clients reading from `tail -f' gets the
message.
(the various `tail -f' gets eventually killed by a SIGPIPE when the
client closes the connection and the server closes the script stdout.
It could take a while due to the buffering, but can be worked out. I
don't know if servers are expected to kill the spawned scripts -- I
don't recall anything from the RFC -- but I'm probably wrong. gmid
anyway doesn't kill the scripts, it let UNIX do its things with signals.
Feature or bug? dunno.)
It doesn't require a client certificates, but uses the subject of it if
provided. There's a check that can be de-commented to enforce the usage
of client certificates.
I'm hosting a demo at
gemini://gemini.omarpolo.com/cgi/lets-chat
Thanks for experimenting with this.
Ive been wondering about treating feeds as if it was a REPL, for groupprojects. Ive never gotten around to IRC but Id like to think peopleinteroperate well in streams with heterogenous coding tricks.
but I don't promise to keep it online. It's a quick-n-dirty script
(less than 50 lines of -hopefully- portable sh), probably filled with
bugs, wrote only to be a demonstration. I don't want to moderate it
if/when people write things. It's really easy to host it locally, for
e.g. using gmid (disclaimer: I'm the author)
$ gmid -x '*' .
from the same directory where you saved the script.
It seems to work with Telescope, Tinmop and Lagrange. Kristall and
Amfora don't seem to support streaming, or maybe I have an old version.
Elpher doesn't stream by design.
Its always nice getting titbits comparing the browsers. Are there anygood research points which evaluate such things in a tabular way(something I had originally planned but I lost 2 weeks with earache)?
I hope this inspires someone to build amazing things with the streaming
capability of text/gemini. There are a lot of possibilities, for
instance capsules like station could stream the feed, or the
notification page; it could be better than clients continously
refreshing the page. Think of it like some sort of "websockets" but for
humans ;)
Gemini clients could "ring" or use some other kind of mechanism to
inform the user that more content is available in a page (for
e.g. Telescope adds a `!' before the tab title.)
A nice touch!
Cheers,
Omar Polo
P.S.: this is also a partial reply to the talkat spec. I love seeing
what creative things folks are building, and I really hope the best for
mbays and their idea (if I got the paternity correctly :P), but I also
like the idea of doing these sort of things over gemini. On one hand I
don't want to push gemini over its boundaries, on the other I love doing
that :)
[2. application/octet-stream; lets-chat]...
Jonathan McHughindieterminacy at libre.brussels