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;;; Simple memcached server implementation
;; Copyright (C) 2012 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 binary-ports)
(ice-9 textual-ports)
(ice-9 rdelim)
(ice-9 match))
(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)
(fcntl sock F_SETFL (logior O_NONBLOCK (fcntl sock F_GETFL)))
sock))
(define (client-error port msg . args)
(close-port port)
(apply error msg args))
(define (parse-int port val)
(let ((num (string->number val)))
(unless (and num (integer? num) (exact? num) (>= num 0))
(client-error port "Expected a non-negative integer: ~s" val))
num))
(define (make-item flags bv)
(vector flags bv))
(define (item-flags item)
(vector-ref item 0))
(define (item-bv item)
(vector-ref item 1))
(define *commands* (make-hash-table))
(define-syntax-rule (define-command (name port store . pat)
body body* ...)
(begin
(define (name port store args)
(match args
(pat body body* ...)
(else
(client-error port "Bad line: ~A ~S" 'name (string-join args " ")))))
(hashq-set! *commands* 'name name)))
(define-command (get port store key* ...)
(let lp ((key* key*))
(match key*
((key key* ...)
(let ((item (hash-ref store key)))
(when item
(put-string port "VALUE ")
(put-string port key)
(put-char port #\space)
(put-string port (number->string (item-flags item)))
(put-char port #\space)
(put-string port (number->string
(bytevector-length (item-bv item))))
(put-char port #\return)
(put-char port #\newline)
(put-bytevector port (item-bv item))
(put-string port "\r\n"))
(lp key*)))
(()
(put-string port "END\r\n")))))
(define-command (set port store key flags exptime bytes
. (and noreply (or ("noreply") ())))
(let* ((flags (parse-int port flags))
(exptime (parse-int port exptime))
(bytes (parse-int port bytes)))
(let ((bv (get-bytevector-n port bytes)))
(unless (= (bytevector-length bv) bytes)
(client-error port "Tried to read ~A bytes, only read ~A"
bytes (bytevector-length bv)))
(hash-set! store key (make-item flags bv))
(when (eqv? (peek-char port) #\return)
(read-char port))
(when (eqv? (peek-char port) #\newline)
(read-char port)))
(put-string port "STORED\r\n")))
(define (client-loop port addr store)
;; Disable Nagle's algorithm. We buffer ourselves.
(setsockopt port IPPROTO_TCP TCP_NODELAY 1)
(setvbuf port 'block 1024)
(let loop ()
;; TODO: Restrict read-line to 512 chars.
(let ((line (read-line port)))
(cond
((eof-object? line)
(close-port port))
(else
(match (string-split (string-trim-right line) #\space)
((verb . args)
(let ((proc (hashq-ref *commands* (string->symbol verb))))
(unless proc
(client-error port "Bad command: ~a" verb))
(proc port store args)
(force-output port)
(loop)))
(else (client-error port "Bad command line" line))))))))
(define (socket-loop socket store)
(let loop ()
(match (accept socket SOCK_NONBLOCK)
((client . addr)
(spawn-fiber
(lambda () (client-loop client addr store))
#:parallel? #t)
(loop)))))
(define* (run-memcached #: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-memcached)
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