1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: modlisp -*-
2 ;;;; *************************************************************************
3 ;;;; FILE IDENTIFICATION
5 ;;;; Name: listener.lisp
6 ;;;; Purpose: Listener and worker processes
7 ;;;; Programmer: Kevin M. Rosenberg
8 ;;;; Date Started: Jun 2003
10 ;;;; $Id: listener.lisp,v 1.3 2003/07/10 18:52:10 kevin Exp $
11 ;;;; *************************************************************************
15 ;;; Variables and data structures for Listener
17 (defvar *listener-count* 0
18 "used to name listeners")
20 (defvar *worker-count* 0
21 "used to name workers")
23 (defvar *active-listeners* nil
24 "List of active listeners")
27 ((port :initarg :port :accessor port)
28 (function :initarg :function :accessor listener-function
30 (function-args :initarg :function-args :accessor function-args
32 (process :initarg :process :accessor process :initform nil)
33 (socket :initarg :socket :accessor socket :initform nil)
34 (workers :initform nil :accessor workers
35 :documentation "list of worker threads")
36 (name :initform "" :accessor name :initarg :name)
37 (base-name :initform "listener" :accessor base-name :initarg :base-name)
38 (wait :initform nil :accessor wait :initarg :wait)
39 (catch-errors :initform nil :accessor catch-errors :initarg :catch-errors)
40 (format :initform :text :accessor listener-format :initarg :format)))
43 ((listener :initarg :listener :accessor listener :initform nil)
44 (connection :initarg :connection :accessor connection :initform nil)
45 (name :initarg :name :accessor name :initform nil)
46 (thread-fun :initarg :thread-fun :accessor thread-fun :initform nil)
47 (process :initarg :process :accessor process :initform nil)))
49 (defmethod print-object ((obj listener) s)
50 (print-unreadable-object (obj s :type t :identity nil)
51 (format s "port ~A" (port obj))))
53 (defmethod print-object ((obj worker) s)
54 (print-unreadable-object (obj s :type t :identity nil)
55 (format s "port ~A" (port (listener obj)))))
59 (defun init/listener (listener state)
60 (check-type listener listener)
63 (when (member listener *active-listeners*)
64 (warn "~&listener already started")
65 (return-from init/listener listener))
68 (setf (name listener) (next-server-name (base-name listener)))
69 (make-socket-server listener))
71 (format t "~&Error while trying to start listener~& ~A" e)
72 (decf *listener-count*)
75 (declare (ignore res))
76 (push listener *active-listeners*)
79 (unless (member listener *active-listeners*)
80 (warn "~&listener is not in active list")
81 (return-from init/listener listener))
82 (dolist (worker (workers listener))
83 (with-slots (connection process) worker
85 (errorset (close-active-socket connection) nil)
86 (setf connection nil))
88 (errorset (destroy-process process) nil)
90 (setf (workers listener) nil)
91 (with-slots (process socket) listener
93 (errorset (close-passive-socket socket) nil)
96 (errorset (destroy-process process) nil)
98 (setq *active-listeners* (remove listener *active-listeners*)))
100 (init/listener listener :stop)
101 (init/listener listener :start))))
103 (defun stop-all/listener ()
104 (dolist (listener *active-listeners*)
106 (init/listener listener :stop))))
108 ;; Low-level functions
110 (defun next-server-name (base-name)
111 (format nil "~A-socket-server-~D" base-name (incf *listener-count*)))
113 (defun next-worker-name (base-name)
114 (format nil "~A-worker-~D" base-name (incf *worker-count*)))
116 (defun make-socket-server (listener)
119 (setf (process listener)
120 (comm:start-up-server :process-name (name listener)
121 :service (port listener)
124 (lw-worker handle listener)))))
127 (setf (socket listener) (create-inet-listener
129 :format (listener-format listener)))
130 (setf (process listener) (make-process
132 #'(lambda () (start-socket-server listener)))))
136 (defmethod initialize-instance :after
137 ((self worker) &key listener connection name &allow-other-keys)
139 (error "connection not provided to modlisp-worker"))
140 (setf (slot-value self 'listener) listener)
141 (setf (slot-value self 'name) name)
142 (setf (slot-value self 'connection) connection)
143 (setf (slot-value self 'thread-fun)
146 (if (catch-errors listener)
148 (apply (listener-function listener)
150 (function-args listener))
152 (cmsg "Error ~A [~A]" e name)))
153 (apply (listener-function listener)
155 (function-args listener)))
157 (errorset (close-active-socket connection) nil)
158 (cmsg-c :threads "~A ended" name)
159 (setf (workers listener)
160 (remove self (workers listener))))))))
162 (defun start-socket-server (listener)
165 (let ((connection (accept-tcp-connection (socket listener))))
168 (apply (listener-function listener)
170 (function-args listener))
171 (errorset (close connection) nil))
172 (let ((worker (make-instance 'worker :listener listener
173 :connection connection
174 :name (next-worker-name
175 (base-name listener)))))
176 (setf (process worker)
177 (make-process (name worker) (thread-fun worker)))
178 (push worker (workers listener))))))
179 (errorset (close-passive-socket (socket listener)) nil)))
182 (defun lw-worker (handle listener)
183 (let ((connection (make-instance 'comm:socket-stream
186 :element-type 'base-char)))
188 (apply (listener-function listener)
190 (function-args listener))
191 (let ((worker (make-instance 'worker :listener listener
192 :connection connection
193 :name (next-worker-name
194 (base-name listener)))))
195 (setf (process worker)
196 (make-process (name worker) (thread-fun worker)))
197 (push worker (workers listener))))))