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;;; connection.el -- handling a tcp based connection
;; Author: Torsten Hilbrich <dictionary@myrkr.in-berlin.de>
;; Keywords: network
;; $Id: connection.el,v 1.9 2002/10/12 09:30:32 torsten Exp $
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
(eval-when-compile
(require 'cl))
(defmacro connection-p (connection)
"Returns non-nil if `connection' is a connection object"
(list 'get connection ''connection))
(defmacro connection-read-point (connection)
"Return the read point of the connection object."
(list 'get connection ''connection-read-point))
(defmacro connection-process (connection)
"Return the process of the connection object."
(list 'get connection ''connection-process))
(defmacro connection-buffer (connection)
"Return the buffer of the connection object."
(list 'get connection ''connection-buffer))
(defmacro connection-set-read-point (connection point)
"Set the read-point for `connection' to `point'."
(list 'put connection ''connection-read-point point))
(defmacro connection-set-process (connection process)
"Set the process for `connection' to `process'."
(list 'put connection ''connection-process process))
(defmacro connection-set-buffer (connection buffer)
"Set the buffer for `connection' to `buffer'."
(list 'put connection ''connection-buffer buffer))
(defun connection-create-data (buffer process point)
"Create a new connection data based on `buffer', `process', and `point'."
(let ((connection (make-symbol "connection")))
(put connection 'connection t)
(connection-set-read-point connection point)
(connection-set-process connection process)
(connection-set-buffer connection buffer)
connection))
(defun connection-open (server port)
"Open a connection to `server' and `port'.
A data structure identifing the connection is returned"
(let ((process-buffer (generate-new-buffer (format " connection to %s:%s"
server
port)))
(process))
(save-excursion
(set-buffer process-buffer)
(setq process (open-network-stream "connection" process-buffer
server port))
(connection-create-data process-buffer process (point-min)))))
(defun connection-status (connection)
"Return the status of the connection.
Possible return values are the symbols:
nil: argument is no connection object
'none: argument has no connection
'up: connection is open and buffer is existing
'down: connection is closed
'alone: connection is not associated with a buffer"
(if (connection-p connection)
(let ((process (connection-process connection))
(buffer (connection-buffer connection)))
(if (not process)
'none
(if (not (buffer-live-p buffer))
'alone
(if (not (eq (process-status process) 'open))
'down
'up))))
nil))
(defun connection-close (connection)
"Force closing of the connection."
(if (connection-p connection)
(progn
(let ((buffer (connection-buffer connection))
(process (connection-process connection)))
(if process
(delete-process process))
(if buffer
(kill-buffer buffer))
(connection-set-process connection nil)
(connection-set-buffer connection nil)))))
(defun connection-send (connection data)
"Send `data' to the process."
(unless (eq (connection-status connection) 'up)
(error "Connection is not up"))
(save-excursion
(set-buffer (connection-buffer connection))
(goto-char (point-max))
(connection-set-read-point connection (point))
(process-send-string (connection-process connection) data)))
(defun connection-send-crlf (connection data)
"Send `data' together with CRLF to the process."
(connection-send connection (concat data "\r\n")))
(defun connection-read (connection delimiter)
"Read data until `delimiter' is found inside the buffer."
(unless (eq (connection-status connection) 'up)
(error "Connection is not up"))
(let ((case-fold-search nil)
match-end)
(save-excursion
(set-buffer (connection-buffer connection))
(goto-char (connection-read-point connection))
;; Wait until there is enough data
(while (not (search-forward-regexp delimiter nil t))
(accept-process-output (connection-process connection) 3)
(goto-char (connection-read-point connection)))
(setq match-end (point))
;; Return the result
(let ((result (buffer-substring (connection-read-point connection)
match-end)))
(connection-set-read-point connection match-end)
result))))
(defun connection-read-crlf (connection)
"Read until a line is completedx with CRLF"
(connection-read connection "\015?\012"))
(defun connection-read-to-point (connection)
"Read until a line is consisting of a single point"
(connection-read connection "\015?\012[.]\015?\012"))
(provide 'connection)
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