;;;; -*- 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 1.9 2003/07/09 19:19:19 kevin Exp $
;;;; *************************************************************************

(in-package #:modlisp)

(defun modlisp-start (&key (port +default-apache-port+)
			   (processor 'demo-apache-command-processor)
			   (processor-args nil)
			   (catch-errors t))
  (let ((listener (make-instance 'listener :port port
				 :base-name "modlisp"			 
				 :function 'apache-command-issuer
				 :function-args (cons processor processor-args)
				 :format :text
				 :wait nil
				 :catch-errors catch-errors)))
    (init/listener listener :start)))


(defun modlisp-stop (listener)
  (init/listener listener :stop))

(defun modlisp-stop-all ()
  (stop-all/listener))


(let ((*number-server-requests* 0)
      (*number-worker-requests* 0)
      (*close-apache-socket* t))
  
  (defun apache-command-issuer (*apache-socket* processor &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))
	     (apply processor command args)
	     (force-output *apache-socket*)
	     (incf *number-worker-requests*)
	     (incf *number-server-requests*)
	     (when *close-apache-socket*
	       (return))))
      (close-active-socket *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 header-value (header key)
  (cdr (assoc key header :test #'string=)))

(defun read-apache-command ()
  (ignore-errors
    (let* ((header (read-apache-header))
	   (content-length (header-value header "content-length"))
	   (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-line ()
  (kmrcl:string-right-trim-one-char
   #\return
   (read-line *apache-socket* nil nil)))

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