104 lines
2.8 KiB
EmacsLisp
Executable file
104 lines
2.8 KiB
EmacsLisp
Executable file
(eval-when-compile (require 'cl))
|
|
(require 'net-fsm)
|
|
|
|
(defvar epmd-hosts '("localhost")
|
|
"Hosts to query EPMDs on.")
|
|
|
|
(defvar epmd-port 4369)
|
|
|
|
(defun epmd-process (event arg)
|
|
(check-event event 'init)
|
|
;; Arg is the request
|
|
(let* ((len (length arg))
|
|
(len-msb (ash len -8))
|
|
(len-lsb (logand len 255)))
|
|
(fsm-send-string (concat (string len-msb len-lsb)
|
|
arg)))
|
|
(ecase (elt arg 0)
|
|
((?n) (fsm-change-state #'epmd-recv-names-resp))
|
|
((?z) (fsm-change-state #'epmd-recv-port-resp))
|
|
((?a) (fsm-change-state #'epmd-recv-alive-resp))))
|
|
|
|
(defun epmd-recv-names-resp (event data)
|
|
(check-event event 'data)
|
|
(assert (>= (length data) 4))
|
|
(fsm-terminate (substring arg 4)))
|
|
|
|
(defun epmd-recv-port-resp (event data)
|
|
(message "Event: %s" event)
|
|
(message "data: %s" data)
|
|
(message "arg: %s" arg)
|
|
(ecase event
|
|
((data)
|
|
(assert (> (length arg) 2))
|
|
(assert (= 119 (elt data 0)))
|
|
(fsm-terminate (+ (ash (elt arg 2) 8)
|
|
(logand (elt arg 3) 255))))
|
|
((closed)
|
|
(fsm-fail))))
|
|
|
|
(defun epmd-recv-alive-resp (event data)
|
|
(ecase event
|
|
((closed)
|
|
(fsm-fail))
|
|
((data)
|
|
(if (equal (string ?y 0) (substring data 0 2))
|
|
(let ((creation (substring data 2)))
|
|
;; Cheat by calling the success continuation without
|
|
;; terminating, since we need to keep the socket open.
|
|
(when fsm-cont
|
|
(funcall fsm-cont creation))
|
|
(fsm-change-state #'epmd-alive))
|
|
(fsm-fail)))))
|
|
|
|
(defun epmd-alive (event data)
|
|
(check-event event 'close)
|
|
(fsm-fail))
|
|
|
|
(defun epmd-show-nodes ()
|
|
(interactive)
|
|
(epmd-collect-names epmd-hosts ""))
|
|
|
|
(defun epmd-collect-names (hosts string)
|
|
(if (null hosts)
|
|
(epmd-show-names string)
|
|
(lexical-let* ((host (car hosts))
|
|
(remaining-hosts (cdr hosts))
|
|
(string string))
|
|
(let ((cont
|
|
(lambda (new-result)
|
|
(epmd-collect-names remaining-hosts
|
|
(format "%s[%s]\n%s\n"
|
|
string host new-result))))
|
|
(fail
|
|
(lambda ()
|
|
(epmd-collect-names remaining-hosts
|
|
(format "%s[%s]\nUnable to connect.\n\n"
|
|
string host)))))
|
|
(fsm-connect host epmd-port #'epmd-process "n" cont fail)))))
|
|
|
|
(defun epmd-port-please (node host cont &optional fail-cont)
|
|
(fsm-connect host epmd-port #'epmd-process (concat "z" node) cont fail-cont))
|
|
|
|
;; (defun epmd-login (nodename &optional cont fail-cont)
|
|
;; (fsm-connect host epmd-port #'epmd-process (epmd-make-alive-req nodename)
|
|
;; cont fail-cont))
|
|
|
|
;; (defun epmd-make-alive-req (nodename)
|
|
;; (with-temp-buffer
|
|
;; (insert ?x)
|
|
|
|
(defun epmd-show-names (string)
|
|
(with-current-buffer (get-buffer-create "*epmd nodes*")
|
|
(erase-buffer)
|
|
(insert string)
|
|
(view-buffer-other-window (current-buffer))))
|
|
|
|
;; testing
|
|
|
|
(defun epmd-test (node host)
|
|
(interactive "sNode: \nsHost: ")
|
|
(epmd-port-please node host (lambda (x) (message "X = %S" x))))
|
|
|
|
(provide 'epmd)
|
|
|