W dniu 2021-06-23 17:59, Felipe Gasper via curl-library napisał(a):
On Jun 23, 2021, at 11:23 AM, Daniel Stenberg via curl-library
<curl-library@cool.haxx.se> wrote:
On Tue, 22 Jun 2021, Weston Schmidt via curl-library wrote:
I'm interested in feedback or suggestions for what/how to define a
good websocket API that complements libcurl.
My very simple idea on how it could be added to the API:
1. We add another value to set CURLOPT_CONNECT_ONLY to (2). If this is
used, and the URL is "http(s)://" then libcurl could "bootstrap" into
a websocket connection.
2. Once it is completed, we could have the application extract the
socket (to have something to wait on) and then use curl_easy_recv()
and curl_easy_send() to receive and send websockets data over that
connection.
What would this be missing?
There’d be want, IMO, for interfaces that differentiate
sending/receiving full messages versus per-frame. (And, of course,
sending text versus binary, *maybe* flexibly enough to accommodate
potential new message types were that ever to happen.) And callbacks
for multi-mode?
Also the data from the close frame would probably be available via
some new CURLINFO_* constants?
A couple other notes (having written a full WS library and a Perl
binding for another):
- curl_easy_recv() would need either to poll under the hood or to do a
socket timeout so that curl could send a ping if the local ping
timeout happens midway through the recv.
- WebSocket compression is a per-message affair: one message can be
compressed while the next is uncompressed.
- WS compression is also tunable; ideally those parameters should be
configurable. (More specifically: WS’ deflate compression is tunable;
any future compression schemes would probably also be.)
I’m excited to see this!
cheers,
-Felipe
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Please also add some way to set/get the Final bit for every websocket
message, in addition to control frame type (text/binary). This will help
to keep memory usage low and still be able to send/receive long WS
messages.
Daniel
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