Read websocket frame until completed

[kwrooijen]

Problem

I was trying out emacs-jupyter to connect to Paperspace Gradient using their token authenticated remote kernel. I noticed that some code executions didn't output anything (e.g. .describe()).

Solution

It turns out that the current :on-message handler doesn't properly handle partial messages. If websocket-frame-completep returns nil we should wait for the next frame and accumulate the message.

We also add continuation websocket-frame-opcode as a valid string response. I'm not sure what impact this will have since continuation isn't actually a type like text or binary

Note

For those interested in connecting to Paperspace Gradient; you have to connect WITHOUT using a port. AFAIK emacs-jupyter won't let you set the port to nil in org, so you have to manually override jupyter-tramp-url-from-file-name and set port to nil

jupyter/jupyter-tramp.el

Lines 282 to 289 in f97f4b5

	(defun jupyter-tramp-url-from-file-name (filename)
	"Return a URL string based off the method, host, and port of FILENAME."
	(with-parsed-tramp-file-name filename nil
	(unless port (setq port (when (functionp 'tramp-file-name-port-or-default)
	;; This function was introduced in Emacs 26.1
	(tramp-file-name-port-or-default v))))
	(format "%s://%s%s" (if (equal method "jpys") "https" "http")
	host (if port (format ":%s" port) ""))))