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: Dec 2002
10 ;;;; $Id: listener.lisp,v 1.2 2003/07/09 22:12:52 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)
33 (socket :initarg :socket :accessor socket)
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 (close-active-socket (connection worker))
84 (destroy-process (process worker))
85 (setf (connection worker) nil)
86 (setf (process worker) nil))
87 (setf (workers listener) nil)
88 (with-slots (process socket) listener
89 (errorset (close-passive-socket socket) t)
90 (errorset (destroy-process process) t)
93 (setq *active-listeners* (remove listener *active-listeners*)))
95 (init/listener listener :stop)
96 (init/listener listener :start))))
98 (defun stop-all/listener ()
99 (dolist (listener *active-listeners*)
101 (init/listener listener :stop))))
103 ;; Low-level functions
105 (defun next-server-name (base-name)
106 (format nil "~A-socket-server-~D" base-name (incf *listener-count*)))
108 (defun next-worker-name (base-name)
109 (format nil "~A-worker-~D" base-name (incf *worker-count*)))
111 (defun make-socket-server (listener)
112 (setf (socket listener) (create-inet-listener
114 :format (listener-format listener)))
115 (setf (process listener) (make-process
117 #'(lambda () (start-socket-server listener))))
121 (defmethod initialize-instance :after
122 ((self worker) &key listener connection name &allow-other-keys)
124 (error "connection not provided to modlisp-worker"))
125 (setf (slot-value self 'listener) listener)
126 (setf (slot-value self 'name) name)
127 (setf (slot-value self 'connection) connection)
128 (setf (slot-value self 'thread-fun)
131 (if (catch-errors listener)
133 (apply (listener-function listener)
135 (function-args listener))
137 (cmsg "Error ~A [~A]" e name)))
138 (apply (listener-function listener)
140 (function-args listener)))
142 (errorset (close-active-socket connection) nil)
143 (cmsg-c :threads "~A ended" name)
144 (setf (workers listener)
145 (remove self (workers listener))))))))
147 (defun start-socket-server (listener)
150 (let ((connection (accept-tcp-connection (socket listener))))
153 (apply (listener-function listener)
155 (function-args listener))
156 (errorset (close connection) nil))
157 (let ((worker (make-instance 'worker :listener listener
158 :connection connection
159 :name (next-worker-name
160 (base-name listener)))))
161 (setf (process worker)
162 (make-process (name worker) (thread-fun worker)))
163 (push worker (workers listener))))))
164 (errorset (close-passive-socket (socket listener)) nil)))