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;; Tekuti
;; Copyright (C) 2008, 2010, 2011, 2012 Andy Wingo <wingo at pobox dot com>
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 3 of
;; the License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; Web server implementation for mod-lisp.
;;
;;; Code:
(define-module (tekuti mod-lisp)
#:use-module (ice-9 rdelim)
#:use-module (system repl error-handling)
#:use-module (srfi srfi-9)
#:use-module (ice-9 poll)
#:use-module (rnrs bytevectors)
#:use-module (web http)
#:use-module (web request)
#:use-module (web response)
#:use-module (web server))
(define *mod-lisp-headers* (make-hash-table))
(define (define-mod-lisp-header! name parser)
(hashq-set! *mod-lisp-headers* (string->symbol (string-downcase name))
(cons name parser)))
(define-mod-lisp-header! "server-protocol" parse-http-version)
(define-mod-lisp-header! "method" parse-http-method)
(define-mod-lisp-header! "url" parse-request-uri)
(define-mod-lisp-header! "server-ip-addr" identity)
(define-mod-lisp-header! "server-ip-port" string->number)
(define-mod-lisp-header! "remote-ip-addr" identity)
(define-mod-lisp-header! "remote-ip-port" string->number)
(define-mod-lisp-header! "server-id" identity)
(define-mod-lisp-header! "server-ip-addr" identity)
(define-mod-lisp-header! "server-baseversion" identity)
(define-mod-lisp-header! "modlisp-version" identity)
(define-mod-lisp-header! "modlisp-major-version" string->number)
(define (lookup-mod-lisp-header sym)
(hashq-ref *mod-lisp-headers* sym))
(define (parse-mod-lisp-header hpair val)
((cdr hpair) val))
(define (read-headers/mod-lisp socket)
(define (read-line*)
(let ((line (read-line socket)))
(if (eof-object? line)
(error "unexpected eof")
line)))
(let lp ((headers '()) (meta '()))
(let ((k (string->symbol (string-downcase (read-line*)))))
(if (eq? k 'end)
(values (reverse! headers) (reverse! meta))
(let ((mod-lisp-header (lookup-mod-lisp-header k))
(v (read-line*)))
(if mod-lisp-header
(lp headers
(acons k (parse-mod-lisp-header mod-lisp-header v) meta))
(lp (acons k (parse-header k v) headers)
meta)))))))
(define (read-request/mod-lisp port)
;; See the note in (web request) regarding chars, bytes, and strings
;; for more notes on charsets.
(set-port-encoding! port "ISO-8859-1")
(call-with-values (lambda () (read-headers/mod-lisp port))
(lambda (headers meta)
(build-request
(assq-ref meta 'url)
#:method (assq-ref meta 'method)
#:version (assq-ref meta 'server-protocol)
#:headers headers
#:meta meta
#:port port))))
;; Note, we only write HTTP headers here, not mod-lisp headers.
(define (write-header/mod-lisp name val port)
(display (header->string name) port)
(newline port)
((header-writer name) val port)
(newline port))
(define (write-response-line/mod-lisp code phrase port)
(display "Status" port)
(newline port)
(display (string-append (number->string code) " " phrase) port)
(newline port))
(define (write-headers/mod-lisp headers port)
(for-each
(lambda (pair)
(write-header/mod-lisp (car pair) (cdr pair) port))
headers))
(define (write-response/mod-lisp r port)
(write-response-line/mod-lisp (response-code r)
(response-reason-phrase r) port)
(write-headers/mod-lisp (response-headers r) port)
(display "end" port) (newline port)
(if (eq? port (response-port r))
r
(build-response #:version (response-version r)
#:code (response-code r)
#:reason-phrase (response-reason-phrase r)
#:headers (response-headers r)
#:port port)))
(define (make-default-socket family addr port)
(let ((sock (socket PF_INET SOCK_STREAM 0)))
(setsockopt sock SOL_SOCKET SO_REUSEADDR 1)
(bind sock family addr port)
sock))
(define-record-type <mod-lisp-server>
(make-mod-lisp-server socket poll-idx poll-set)
mod-lisp-server?
(socket mod-lisp-socket)
(poll-idx mod-lisp-poll-idx set-mod-lisp-poll-idx!)
(poll-set mod-lisp-poll-set))
(define *error-events* (logior POLLHUP POLLERR))
(define *read-events* POLLIN)
(define *events* (logior *error-events* *read-events*))
;; -> server
(define* (mod-lisp-open #:key
(host #f)
(family AF_INET)
(addr (if host
(inet-pton family host)
INADDR_LOOPBACK))
(port 8080)
(socket (make-default-socket family addr port)))
(listen socket 128)
(sigaction SIGPIPE SIG_IGN)
(let ((poll-set (make-empty-poll-set)))
(poll-set-add! poll-set socket *events*)
(make-mod-lisp-server socket 0 poll-set)))
;; -> (client request body | #f #f #f)
(define (mod-lisp-read server)
(let* ((poll-set (mod-lisp-poll-set server)))
(let lp ((idx (mod-lisp-poll-idx server)))
(let ((revents (poll-set-revents poll-set idx)))
(cond
((zero? idx)
;; The server socket, and the end of our downward loop.
(cond
((zero? revents)
;; No client ready, and no error; poll and loop.
(poll poll-set)
(lp (1- (poll-set-nfds poll-set))))
((not (zero? (logand revents *error-events*)))
;; An error.
(throw 'interrupt))
(else
;; A new client. Add to set, poll, and loop.
;;
;; FIXME: preserve meta-info.
(let ((client (accept (poll-set-port poll-set idx))))
;; Fully buffered.
(setvbuf (car client) _IOFBF)
;; From "HOP, A Fast Server for the Diffuse Web", Serrano.
(setsockopt (car client) SOL_SOCKET SO_SNDBUF (* 12 1024))
(poll-set-add! poll-set (car client) *events*)
(poll poll-set)
(lp (1- (poll-set-nfds poll-set)))))))
((zero? revents)
;; Nothing on this port.
(lp (1- idx)))
;; Otherwise, a client socket with some activity on
;; it. Remove it from the poll set.
(else
(let ((port (poll-set-remove! poll-set idx)))
(cond
((eof-object? (peek-char port))
;; EOF.
(close-port port)
(lp (1- idx)))
(else
;; Otherwise, try to read a request from this port.
;; Record the next index.
(set-mod-lisp-poll-idx! server (1- idx))
(with-throw-handler
#t
(lambda ()
(let ((req (read-request/mod-lisp port)))
(values port
req
(read-request-body req))))
(lambda (k . args)
(false-if-exception (close-port port)))))))))))))
;; -> unspecified values
(define (mod-lisp-write server client response body)
(let ((response (write-response/mod-lisp response client)))
(cond
((not body)) ; pass
((bytevector? body)
(write-response-body response body))
(else
(error "Expected a bytevector for body" body)))
(close-port (response-port response))))
;; -> unspecified values
(define (mod-lisp-close server)
(let ((poll-set (mod-lisp-poll-set server)))
(let lp ((n (poll-set-nfds poll-set)))
(if (positive? n)
(begin
(close-port (poll-set-remove! poll-set (1- n)))
(lp (1- n)))))))
(define-server-impl mod-lisp
mod-lisp-open
mod-lisp-read
mod-lisp-write
mod-lisp-close)
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