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;;; Simple ping server implementation
;; Copyright (C) 2016 Free Software Foundation, Inc.
;; This library 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.
;;
;; This library 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 this library; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
;; 02110-1301 USA
(use-modules (rnrs bytevectors)
(fibers)
(ice-9 textual-ports)
(ice-9 rdelim)
(ice-9 match))
(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)
sock))
(define (client-loop port addr store)
(let loop ()
;; TODO: Restrict read-line to 512 chars.
(let ((line (read-line port)))
(cond
((eof-object? line)
(close-port port))
(else
(put-string port line)
(put-char port #\newline)
(force-output port)
(loop))))))
(define (socket-loop socket store)
(let loop ()
(match (accept socket)
((client . addr)
(set-nonblocking! client)
;; Disable Nagle's algorithm. We buffer ourselves.
(setsockopt client IPPROTO_TCP TCP_NODELAY 0)
(spawn-fiber (lambda () (client-loop client addr store))
#:parallel? #t)
(loop)))))
(define* (run-ping-server #:key
(host #f)
(family AF_INET)
(addr (if host
(inet-pton family host)
INADDR_LOOPBACK))
(port 11211)
(socket (make-default-socket family addr port)))
(listen socket 1024)
(sigaction SIGPIPE SIG_IGN)
(socket-loop socket (make-hash-table)))
(run-fibers run-ping-server)
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