Le 2021-07-02 à 17 h 53, Daniel Stenberg via curl-library a écrit :
This will make it impossible to specify a continuation frame rather
than a data frame. (Context: when a message is fragmented, the
message’s first frame is text/binary, and the latter ones are
continuation.)
"CURL_WS_MORE" is my currently suggested flag to say to libcurl that
there's more data coming that belongs to the same data packet. Doesn't
that work?
could libcurl wait for all the fragmented messages to arrive, then
concat them and serve the completed message to the calling application?
Alternatively, have separate curl_ws_send_text and curl_ws_send_binary
functions?
That could certainly work and would save users sending text from having
to set a "this is text" bit. My personal preference is to rather keep it
to one function with the bits for type, but I'm here to listen in what
peeps want and I will not push my own preferences if I'm in a minority.
Alternatively, a curl_ws_send_ping and curl_ws_send_pong would be useful.
Also, considering sending a pong response when a ping request is sent
automatically, unless it's specified by the calling program somehow.
Yes, sorry I didn't even think about that. I'm positive users will
immediately come up with use cases where they want 22 parallel websocket
connections going on so they cannot block. Or perhaps we can offer some
kind of blocking abilitites, but non-blocking is a must-support feature.
Another thing that struck me is that we probably want to offer a decent
way to do non-blocking ws-connects as well for the 22-connections user
who won't accept that the application will block once for each setup...
Couldn't libcurl have both? a blocking and a non-blocking curl_ws_recv()
function?
Having the caller call curl_ws_recv() directly would mean that that
same caller would need to know when the socket has data to read. I
don’t know if that’s always a safe assumption.
Yeah, that's one of my outstanding questions. How do we do that?
Using a callback function may be a solution, when a message is received,
libcurl calls a function specified by the application, something like
cur_ws_on_message_received()
/Nicolas
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