;;;; -*- 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 1.12 2003/07/11 07:00:57 kevin Exp $
;;;; *************************************************************************

(in-package #:modlisp)

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


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

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

;; Internal functions

(defun modlisp-command-issuer (*modlisp-socket* processor &rest args)
  "generates commands from modlisp, issues commands to processor-fun"
  (unwind-protect
       (progn
	 (let ((*number-worker-requests* 0)
	       (*close-modlisp-socket* t))
	   (do ((command (read-modlisp-command) (read-modlisp-command)))
	       ((null command))
	     (apply processor command args)
	     (finish-output *modlisp-socket*)
	     (incf *number-worker-requests*)
	     (incf *number-server-requests*)
	     (when *close-modlisp-socket*
	       (return)))))
    (close-active-socket *modlisp-socket*)))
  
(defun header-value (header key)
  "Returns the value of a modlisp header"
  (cdr (assoc key header :test #'string=)))

(defun read-modlisp-command ()
  (ignore-errors
    (let* ((header (read-modlisp-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 *modlisp-socket*)
       (push (cons "posted-content" content) header))
     header)))

(defun read-modlisp-line ()
  (kmrcl:string-right-trim-one-char
   #\return
   (read-line *modlisp-socket* nil nil)))

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

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