;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: modlisp -*-
;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name:          base.lisp
;;;; Purpose:       Utility functions for modlisp package
;;;; Programmer:    Kevin M. Rosenberg
;;;; Date Started:  Dec 2002
;;;;
;;;; $Id: base.lisp,v 1.4 2003/07/05 22:54:00 kevin Exp $
;;;; *************************************************************************

(in-package #:modlisp)

(defun destroy-process (process)
  #+sbcl (sb-thread:destroy-thread process)
  #+cmucl (mp:destroy-process process)
  #+allegro (mp:process-kill process)
  #+lispworks (mp:process-kill process)
  )

(defun close-socket (sock)
  (ignore-errors (close sock)))


(defun modlisp-start (&key (port +default-apache-port+)
			   (function 'demo-apache-command-processor)
			   (function-args nil))
  (let ((listener (make-instance 'listener)))
    (handler-case
	(make-socket-server (next-server-name) function port listener
			    :format :text :wait nil
			    :function-args function-args)
      (error (e)
	(format t "~&Error while trying to start modlisp server~&  ~A" e)
	(decf *listener-count*)
	(values nil nil))
      (:no-error (process socket)
	(setf (process listener) process)
	(setf (socket listener) socket)
	(push listener *active-listeners*)
	listener))))
    
(defun modlisp-stop (listener)
  (unless listener
    (cmsg "listener is NIL in modlisp-stop")
    (return-from modlisp-stop))
  (dolist (worker (workers listener))
    (close-socket (socket worker))
    (destroy-process (process worker)))
  (setf (workers listener) nil)
  (with-slots (process socket) listener
    (handler-case
	  (destroy-process process)
      (error (e)
	(format t "~&Error while trying to kill modlisp server~&  ~A" e)))
    (when socket
      (ignore-errors (close-socket socket))))
  (setq *active-listeners* (remove listener *active-listeners*)))
    
(defun next-server-name ()
  (format nil "modlisp-socket-server-~d" (incf *listener-count*))) 

(defun next-worker-name ()
  (format nil "modlisp-worker-~d" (incf *worker-count*)))

(let ((*number-server-requests* 0)
      (*number-worker-requests* 0)
      (*close-apache-socket* t))
  
  (defun apache-command-issuer (*apache-socket* processor-fun &rest args)
    "generates commands from apache, issues commands to processor-fun"
    (unwind-protect
	 (progn
	   (setq *number-worker-requests* 0)
	   (do ((command (read-apache-command) (read-apache-command)))
	       ((null command) 'done)
	     (apply processor-fun command args)
	     (force-output *apache-socket*)
	     (incf *number-worker-requests*)
	     (incf *number-server-requests*)
	     (when *close-apache-socket*
	       (return))))
      (close *apache-socket*)))

  (defun get-number-worker-requests ()
    *number-worker-requests*)

  (defun get-number-server-requests ()
    *number-server-requests*)
  
  (defun set-close-apache-socket (close?)
    (setq *close-apache-socket* close?))
  
  ) ;; closure

(defun read-apache-command ()
  (ignore-errors
    (let* ((header (read-apache-header))
	  (content-length (cdr (assoc "content-length" header :test #'equal)))
	  (content (when content-length 
		     (make-string
		      (parse-integer content-length :junk-allowed t)))))
     (when content
       (read-sequence content *apache-socket*)
       (push (cons "posted-content" content) header))
     header)))

(defun read-apache-header ()
  (loop for key = (read-line *apache-socket* nil nil)
			while (and key
				   (string-not-equal key "end")
				   (> (length key) 1))
		      for value = (read-line *apache-socket* nil nil)
		      collect (cons key value)))

(defun write-header-line (key value)
  (write-string key *apache-socket*)
  (write-char #\NewLine *apache-socket*)
  (write-string value *apache-socket*)
  (write-char #\NewLine *apache-socket*))

(defun header-value (command key)
  (cdr (assoc key command :test #'string=)))