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 1.4 2003/07/11 02:37:33 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 (timeout :initform nil :accessor timeout :initarg :timeout)
40 (number-fixed-workers :initform nil :accessor number-fixed-workers
41 :initarg :number-fixed-workers)
42 (catch-errors :initform nil :accessor catch-errors :initarg :catch-errors)
43 (format :initform :text :accessor listener-format :initarg :format)))
45 (defclass fixed-worker ()
46 ((listener :initarg :listener :accessor listener :initform nil)
47 (name :initarg :name :accessor name :initform nil)
48 (process :initarg :process :accessor process :initform nil)))
50 (defclass worker (fixed-worker)
51 ((connection :initarg :connection :accessor connection :initform nil)
52 (thread-fun :initarg :thread-fun :accessor thread-fun :initform nil)))
55 (defmethod print-object ((obj listener) s)
56 (print-unreadable-object (obj s :type t :identity nil)
57 (format s "port ~A" (port obj))))
59 (defmethod print-object ((obj fixed-worker) s)
60 (print-unreadable-object (obj s :type t :identity nil)
61 (format s "port ~A" (port (listener obj)))))
65 (defun init/listener (listener state)
66 (check-type listener listener)
69 (when (member listener *active-listeners*)
70 (warn "~&listener already started")
71 (return-from init/listener listener))
74 (setf (name listener) (next-server-name (base-name listener)))
75 (make-socket-server listener))
77 (format t "~&Error while trying to start listener~& ~A" e)
78 (decf *listener-count*)
81 (declare (ignore res))
82 (push listener *active-listeners*)
85 (unless (member listener *active-listeners*)
86 (warn "~&listener is not in active list")
87 (return-from init/listener listener))
88 (dolist (worker (workers listener))
89 (when (and (typep worker 'worker)
91 (errorset (close-active-socket
92 (connection worker)) nil)
93 (setf (connection worker) nil))
94 (when (process worker)
95 (errorset (destroy-process (process worker)) nil)
96 (setf (process worker) nil)))
97 (setf (workers listener) nil)
98 (with-slots (process socket) listener
100 (errorset (close-passive-socket socket) nil)
103 (errorset (destroy-process process) nil)
105 (setq *active-listeners* (remove listener *active-listeners*)))
107 (init/listener listener :stop)
108 (init/listener listener :start))))
110 (defun stop-all/listener ()
111 (dolist (listener *active-listeners*)
113 (init/listener listener :stop))))
115 ;; Low-level functions
117 (defun next-server-name (base-name)
118 (format nil "~A-socket-server-~D" base-name (incf *listener-count*)))
120 (defun next-worker-name (base-name)
121 (format nil "~A-worker-~D" base-name (incf *worker-count*)))
123 (defun make-socket-server (listener)
126 (setf (process listener)
127 (comm:start-up-server :process-name (name listener)
128 :service (port listener)
131 (lw-worker handle listener)))))
134 (setf (socket listener) (create-inet-listener
136 :format (listener-format listener)))
137 (if (number-fixed-workers listener)
138 (start-fixed-number-of-workers listener)
139 (setf (process listener) (make-process
142 (start-socket-server listener))))))
146 (defmethod initialize-instance :after
147 ((self worker) &key listener connection name &allow-other-keys)
149 (apply (listener-function listener)
151 (function-args listener))))
153 (error "connection not provided to modlisp-worker"))
154 (setf (slot-value self 'listener) listener)
155 (setf (slot-value self 'name) name)
156 (setf (slot-value self 'connection) connection)
157 (setf (slot-value self 'thread-fun)
160 (if (catch-errors listener)
162 (if (timeout listener)
163 (with-timeout ((timeout listener))
167 (cmsg "Error ~A [~A]" e name)))
168 (if (timeout listener)
169 (with-timeout ((timeout listener))
173 (errorset (finish-output connection) nil)
174 (errorset (close-active-socket connection) nil)
175 (cmsg-c :threads "~A ended" name)
176 (setf (workers listener)
177 (remove self (workers listener)))))))))
179 (defun start-socket-server (listener)
182 (let ((connection (accept-tcp-connection (socket listener))))
185 (apply (listener-function listener)
187 (function-args listener))
189 (errorset (finish-output connection) nil)
190 (errorset (close-active-socket connection) nil)))
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))))))
198 (errorset (close-passive-socket (socket listener)) nil)))
201 (defun lw-worker (handle listener)
202 (let ((connection (make-instance 'comm:socket-stream
205 :element-type 'base-char)))
208 (apply (listener-function listener)
210 (function-args listener))
211 (finish-output connection))
212 (let ((worker (make-instance 'worker :listener listener
213 :connection connection
214 :name (next-worker-name
215 (base-name listener)))))
216 (setf (process worker)
217 (make-process (name worker) (thread-fun worker)))
218 (push worker (workers listener))))))
220 ;; Fixed pool of workers
222 (defun start-fixed-number-of-workers (listener)
223 (dotimes (i (number-fixed-workers listener))
224 (let ((name (next-worker-name (base-name listener))))
226 (make-instance 'fixed-worker
231 name #'(lambda () (fixed-worker name listener))))
232 (workers listener)))))
235 (defun fixed-worker (name listener)
237 (let ((connection (accept-tcp-connection (socket listener))))
239 (apply (listener-function listener)
241 (function-args listener))))
244 (if (catch-errors listener)
246 (if (timeout listener)
247 (with-timeout ((timeout listener))
251 (cmsg "Error ~A [~A]" e name)))
252 (if (timeout listener)
253 (with-timeout ((timeout listener))
257 (format t "Error: ~A" e)))
258 (errorset (finish-output connection) nil)
259 (errorset (close connection) nil))))))