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;;; 8sync --- Asynchronous programming for Guile
;;; Copyright © 2017 Christopher Allan Webber <cwebber@dustycloud.org>
;;;
;;; Code (also under the LGPL) borrowed from fibers:
;;; Copyright © 2016 Andy Wingo <wingo@pobox.com>
;;; and Guile:
;;; Copyright © 2010, 2011, 2012, 2015 Free Software Foundation, Inc.
;;;
;;; This file is part of 8sync.
;;;
;;; 8sync is free software: you can redistribute it and/or modify it
;;; under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation, either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; 8sync 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 Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with 8sync. If not, see <http://www.gnu.org/licenses/>.
(define-module (8sync systems web)
#:use-module (oop goops)
#:use-module (ice-9 match)
#:use-module (ice-9 receive)
#:use-module (web http)
#:use-module (web request)
#:use-module (web response)
#:use-module (web server)
#:use-module (rnrs io ports)
#:use-module (8sync)
#:export (<web-server>))
(define-actor <web-server> (<actor>)
((*init* web-server-socket-loop)
(*cleanup* web-server-cleanup)
(shutdown web-server-shutdown)
(new-client web-server-client-loop)
(handle-request web-server-handle-request))
(host #:init-value #f
#:init-keyword #:host
#:getter .host)
(family #:init-value AF_INET
#:init-keyword #:family
#:getter .family)
(port-num #:init-value 8080
#:init-keyword #:port
#:getter .port-num)
(addr #:init-keyword #:addr
#:accessor .addr)
(socket #:init-value #f
#:accessor .socket)
(upgrade #:init-value '()
#:allocation #:each-subclass)
(http-handler #:init-keyword #:http-handler
#:getter .http-handler))
(define-method (initialize (web-server <web-server>) init-args)
(next-method)
;; Make sure the addr is set up
(when (not (slot-bound? web-server 'addr))
(set! (.addr web-server)
(if (.host web-server)
(inet-pton (.family web-server)
(.host web-server))
INADDR_LOOPBACK)))
;; Set up the socket
(set! (.socket web-server)
(make-default-socket (.family web-server)
(.addr web-server)
(.port-num web-server)))
;; This is borrowed from Guile's web server.
;; Andy Wingo added the line with this commit:
;; * module/web/server/http.scm (http-open): Ignore SIGPIPE. Keeps the
;; server from dying in some circumstances.
(sigaction SIGPIPE SIG_IGN))
;; @@: Borrowed from Guile itself / Fibers
(define (set-nonblocking! port)
(fcntl port F_SETFL (logior O_NONBLOCK (fcntl port F_GETFL)))
(setvbuf port 'block 1024))
(define (make-default-socket family addr port)
(let ((sock (socket PF_INET SOCK_STREAM 0)))
(setsockopt sock SOL_SOCKET SO_REUSEADDR 1)
(fcntl sock F_SETFD FD_CLOEXEC)
(bind sock family addr port)
(set-nonblocking! sock)
;; We use a large backlog by default. If the server is suddenly hit
;; with a number of connections on a small backlog, clients won't
;; receive confirmation for their SYN, leading them to retry --
;; probably successfully, but with a large latency.
(listen sock 1024)
sock))
(define (web-server-socket-loop web-server message)
"The main loop on our socket. Keep accepting new clients as long
as we're alive."
(while #t
(match (accept (.socket web-server))
((client . sockaddr)
;; From "HOP, A Fast Server for the Diffuse Web", Serrano.
(setsockopt client SOL_SOCKET SO_SNDBUF (* 12 1024))
(set-nonblocking! client)
;; Always disable Nagle's algorithm, as we handle buffering
;; ourselves. Ignore exceptions if it's not a TCP port, or
;; TCP_NODELAY is not defined on this platform.
(false-if-exception
(setsockopt client IPPROTO_TCP TCP_NODELAY 0))
(<- (actor-id web-server) 'new-client client)))))
(define (keep-alive? response)
(let ((v (response-version response)))
(and (or (< (response-code response) 400)
(= (response-code response) 404))
(case (car v)
((1)
(case (cdr v)
((1) (not (memq 'close (response-connection response))))
((0) (memq 'keep-alive (response-connection response)))))
(else #f)))))
(define (web-server-client-loop web-server message client)
"Read request(s) from a client and pass off to the handler."
(with-throw-handler #t
(lambda ()
(let loop ()
(define (respond-and-maybe-continue _ response body)
(write-response response client)
(when body
(put-bytevector client body))
(force-output client)
(if (and (keep-alive? response)
(not (eof-object? (peek-char client))))
(loop)
(close-port client)))
(cond
((eof-object? (lookahead-u8 client))
(close-port client))
(else
(catch #t
(lambda ()
(let* ((request (read-request client))
(body (read-request-body request)))
(call-with-message
;; TODO: Add error handling in case we get an error
;; response
(<-wait (actor-id web-server) 'handle-request
request body)
respond-and-maybe-continue)))
(lambda (key . args)
(display "While reading request:\n" (current-error-port))
(print-exception (current-error-port) #f key args)
(respond-and-maybe-continue
#f ;; ignored, there is no message
(build-response #:version '(1 . 0) #:code 400
#:headers '((content-length . 0)))
#vu8())))))))
(lambda (k . args)
(catch #t
(lambda () (close-port client))
(lambda (k . args)
(display "While closing port:\n" (current-error-port))
(print-exception (current-error-port) #f k args))))))
(define (web-server-handle-request web-server message
request body)
(receive (response body)
((.http-handler web-server) request body)
(receive (response body)
(sanitize-response request response body)
(<-reply message response body))))
(define (web-server-cleanup web-server message)
;; @@: Should we close any pending requests too?
(close (.socket web-server)))
(define (web-server-shutdown web-server message)
(self-destruct web-server))
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