base.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: modlisp -*-
   2 ;;;; *************************************************************************
   3 ;;;; FILE IDENTIFICATION
   4 ;;;;
   5 ;;;; Name:          base.lisp
   6 ;;;; Purpose:       Utility functions for modlisp package
   7 ;;;; Programmer:    Kevin M. Rosenberg
   8 ;;;; Date Started:  Dec 2002
   9 ;;;;
  10 ;;;; $Id: base.lisp,v 1.1 2003/07/04 19:52:32 kevin Exp $
  11 ;;;; *************************************************************************
  12
  13 (in-package #:modlisp)
  14
  15
  16 (let ((*listener-socket* nil)
  17       (*listener-process* nil))
  18
  19   (defun modlisp-start (&key (port +default-apache-port+)
  20                              (function 'sample-process-apache-command))
  21     (handler-case
  22         (make-socket-server (next-server-name) function port :format :text
  23                             :wait nil)
  24       (error (e)
  25         (format t "Error ~A" e)
  26         (decf *listener-count*)
  27         nil)
  28       (:no-error (proc socket)
  29         (setq *listener-socket* socket)
  30         (setq *listener-proc* proc)
  31         proc)))
  32
  33   (defun modlisp-stop ()
  34     (when *listener-proc*
  35       (format t "~&; killing ~d~%" *listener-proc*)
  36       #+sbcl (sb-unix:unix-kill *listener-proc* :sigalrm)
  37       #+allegro (mp:process-kill *listener-proc*)
  38       #+allegro (mp:process-allow-schedule)
  39       )
  40     (setq *listener-proc* nil)
  41     (when *listener-socket*
  42       (ignore-errors (close *listener-socket*))
  43       (setq *listener-socket* nil)))
  44
  45  )
  46
  47 (defun next-server-name ()
  48   (format nil "modlisp-socket-server-~d" (incf *listener-count*)))
  49
  50 (defun next-worker-name ()
  51   (format nil "modlisp-worker-~d" (incf *worker-count*)))
  52
  53
  54 (defun apache-command-issuer (*apache-socket*
  55                               &optional
  56                               (processor-fun 'demo-apache-command-processor))
  57   "generates commands from apache, issues commands to processor-fun"
  58   (let ((*close-apache-socket* t))
  59     (unwind-protect
  60         (loop for *apache-nb-use-socket* from 0
  61             for command = (get-apache-command)
  62             while command
  63             do (funcall processor-fun command)
  64               (force-output *apache-socket*)
  65             until *close-apache-socket*)
  66       (close *apache-socket*))))
  67
  68 (defun get-apache-command ()
  69   (ignore-errors
  70    (let* ((header (loop for key = (read-line *apache-socket* nil nil)
  71                         while (and key
  72                                    (string-not-equal key "end")
  73                                    (> (length key) 1))
  74                       for value = (read-line *apache-socket* nil nil)
  75                       collect (cons key value)))
  76           (content-length (cdr (assoc "content-length" header :test #'equal)))
  77           (content (when content-length
  78                      (make-string
  79                       (parse-integer content-length :junk-allowed t)))))
  80      (when content
  81        (read-sequence content *apache-socket*)
  82        (push (cons "posted-content" content) header))
  83      header)))
  84
  85 (defun write-header-line (key value)
  86   (write-string key *apache-socket*)
  87   (write-char #\NewLine *apache-socket*)
  88   (write-string value *apache-socket*)
  89   (write-char #\NewLine *apache-socket*))
  90
  91 (defun header-value (command key)
  92   (cdr (assoc key command :test #'string=)))
  93
  94
  95 ;;; Default (demo) processor
  96
  97 (defun demo-apache-command-processor (command)
  98   "Sample function to process an apache command"
  99   (if (equal (header-value command "url") "/asp/fixed")
 100       (fixed-request)
 101       (debug-request command)))
 102
 103 (defun fixed-request ()
 104   (let ((html (fixed-html)))
 105     (write-header-line "Status" "200 OK")
 106     (write-header-line "Content-Type" "text/html")
 107     (write-header-line "Content-Length" (format nil "~d" (length html)))
 108     (write-header-line "Keep-Socket" "1")
 109     (write-string "end" *apache-socket*)
 110     (write-char #\NewLine *apache-socket*)
 111     (write-string html *apache-socket*)
 112     (setq *close-apache-socket* nil))  )
 113
 114 (defun debug-request (command)
 115   (let ((html (debug-table command)))
 116     (write-header-line "Status" "200 OK")
 117     (write-header-line "Content-Type" "text/html")
 118     (write-header-line "Keep-Socket" "0")
 119     (write-string "end" *apache-socket*)
 120     (write-char #\NewLine *apache-socket*)
 121     (write-string html *apache-socket*)
 122     (setq *close-apache-socket* t))  )
 123
 124 (defun debug-table (command)
 125   (with-output-to-string (s)
 126    (write-string "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">
 127 <HTML><HEAD></HEAD><BODY><TABLE bgcolor=\"#c0c0c0\">
 128 <TR bgcolor=\"yellow\"><TH COLSPAN=2>ACL 6.2 + mod_lisp 2.0 + apache + Linux</TH></TR>
 129 <TR bgcolor=\"yellow\"><TH>Key</TH><TH>Value</TH></TR>" s)
 130    (format s "<TR bgcolor=\"#F0F0c0\"><TD>apache-nb-use-socket</TD><TD>~a</TD></TR>"  *apache-nb-use-socket*)
 131    (loop for (key . value) in command do
 132          (format s "<TR bgcolor=\"#F0F0c0\"><TD>~a</TD><TD>~a</TD></TR>" key value))
 133    (write-string "</TABLE></BODY></HTML>" s)))
 134
 135 (defun fixed-html ()
 136   "<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML//EN\">
 137 <HTML><HEAD></HEAD><BODY><H1>mod_lisp 2.0</H1><P>This is a constant
 138   html string sent by mod_lisp</P></BODY></HTML>")