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GNU GENERAL PUBLIC LICENSE
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into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

2
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this tool was made by an Anonymous third party, provided primarily at:
7ks473deh6ggtwqsvbqdurepv5i6iblpbkx33b6cydon3ajph73sssad.onion:50000

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server/eventloop-server-experiment/check-gforth.4th Normal file
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: (line) ( n -- ) 0 DO [char] - emit LOOP ;
: (_warning) ( n -- ) dup (line) space ." Warning" space (line) ;
: (warning-line) ( -- ) 30 (_warning) ;
: check-gforth ( -- )
s" gforth" environment? IF
s" 0.7.3" compare 0<> IF
(warning-line) cr
." This code was developed for gforth version 0.7.3, "
." other versions may or may not work." cr
(warning-line) cr cr
THEN
ELSE
." This code depends on gforth specific C FFI." cr abort
THEN ;
check-gforth

50
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256 constant CONNECTION_BUFFER_SIZE
0
cell +field connection.number
cell +field connection.fd
cell +field connection.connected
cell +field connection.bufferlen
CONNECTION_BUFFER_SIZE +field connection.buffer
constant /CONNECTION
1024 10 * constant MAX_CONNECTIONS
variable last-connection -1 last-connection !
variable largest-index -1 largest-index !
MAX_CONNECTIONS /CONNECTION * constant CONNECTIONS_SIZE
create connections CONNECTIONS_SIZE allot
connections CONNECTIONS_SIZE erase
: (translate) ( index-u -- connection-addr )
/CONNECTION * connections + ;
: (untranslate) ( connection-addr -- index-u )
connections - /CONNECTION / ;
: (find-free) ( -- index-u flag )
MAX_CONNECTIONS 0 DO
I (translate) connection.connected @ invert IF
I true UNLOOP EXIT
THEN
LOOP 0 false ;
: connections.append ( connection-addr -- flag )
(find-free) IF
tuck (translate) /CONNECTION move
dup last-connection !
dup largest-index @ > IF
largest-index !
ELSE
drop
THEN
true
ELSE
2drop false
THEN ;
: connections.count ( -- count-u )
largest-index @ 1+ ;
: connections.at ( index-u -- connection-addr )
(translate) ;
: connections.last ( -- connection-addr )
last-connection @ (translate) ;
: connections.indexOf ( connection-addr -- index-u )
(untranslate) ;

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0 constant EVENT_IDLE
1 constant EVENT_CONNECTION_NEW
2 constant EVENT_CONNECTION_CLOSED
3 constant EVENT_CONNECTION_SEND
4 constant EVENT_CONNECTION_RECV

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32 constant MAX_EVENTHANDLERS
0
cell +field eventhandler.eventid
cell +field eventhandler.xt
constant /EVENTHANDLER
MAX_EVENTHANDLERS /EVENTHANDLER * constant EVENTHANDLERS_SIZE
create eventhandlers EVENTHANDLERS_SIZE allot
eventhandlers EVENTHANDLERS_SIZE erase
: (translate) ( index-u -- eventhandler-addr ) /EVENTHANDLER * eventhandlers + ;
: (eventhandler-set?) ( eventhandler-addr -- flag ) eventhandler.xt @ 0<> ;
: (set-eventhandler) ( handler-xt eventid-u eventhandler-addr -- )
tuck eventhandler.eventid ! eventhandler.xt ! ;
: eventhandlers.remove ( index-u -- )
(translate) /EVENTHANDLER erase ;
: eventhandlers.append ( handler-xt eventid-u -- index-u )
MAX_EVENTHANDLERS 0 DO
I (translate) dup (eventhandler-set?) invert IF
(set-eventhandler) UNLOOP EXIT
ELSE
drop
THEN
LOOP
true abort" no free eventhandler slots!" ;

43
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require events.4th
require eventhandlers.4th
variable continue
: (call) ( eventdata-u eventid-u eventhandler-addr -- )
eventhandler.xt @ execute ;
: (handles?) ( eventid-u eventhandler-addr -- flag )
tuck eventhandler.eventid @ = swap eventhandler.xt @ 0<> and ;
: eventloop.has-events? ( -- flag )
events.has-item? ;
: eventloop.stop-propagation ( -- )
false continue ! ;
: eventloop.dispatch ( -- )
true continue !
events.dequeue
MAX_EVENTHANDLERS 0 DO
continue @ invert IF
2drop UNLOOP EXIT
THEN
2dup I (translate) 2dup (handles?) IF
(call)
ELSE
drop 2drop
THEN
LOOP 2drop ;
: eventloop.run ( -- )
BEGIN
eventloop.has-events? IF
eventloop.dispatch
ELSE
EXIT
THEN
AGAIN ;
: eventloop.idlerun ( -- )
BEGIN
eventloop.has-events? IF
eventloop.dispatch
ELSE
0 0 events.enqueue eventloop.dispatch
THEN
AGAIN ;

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256 constant MAX_EVENTS
0
cell +field event.id
cell +field event.data
constant /EVENT
0
cell +field eventlink.next
/EVENT +field eventlink.event
constant /EVENTLINK
variable first-event
variable last-event
variable free-event
MAX_EVENTS /EVENTLINK * constant EVENTS_SIZE
create events EVENTS_SIZE allot
: (translate) ( index-u -- eventlink-addr )
/EVENTLINK * events + ;
: (link-to-next) ( index-u -- )
dup 1+ (translate) swap (translate) eventlink.next ! ;
: (fix-last-link) ( -- )
MAX_EVENTS 1- (translate) eventlink.next 0 swap ! ;
: (set-first-free) ( -- )
0 (translate) free-event ! ;
: (link-free) ( -- )
MAX_EVENTS 0 DO I (link-to-next) LOOP
(fix-last-link)
(set-first-free) ;
: (free-available?) ( -- flag )
free-event @ 0<> ;
: (assert-free-available) ( -- )
(free-available?) invert abort" no free eventlinks available." ;
: (next-free) ( -- eventlink-addr )
(assert-free-available)
free-event @ dup eventlink.next @ free-event ! ;
: events.clear ( -- )
0 first-event ! 0 last-event !
events EVENTS_SIZE erase
(link-free) ;
: (set-next-null) ( eventlink-addr -- )
dup eventlink.next 0 swap ! ;
: (first-event-exists?) ( -- flag ) first-event @ 0<> ;
: (last-event-exists?) ( -- flag ) last-event @ 0<> ;
: (as-first-event) ( eventlink-addr -- ) first-event ! ;
: (as-last-event) ( eventlink-addr -- ) last-event ! ;
: (after-last-event) ( eventlink-addr -- )
dup last-event @ eventlink.next !
last-event ! ;
: (append-event) ( eventlink-addr -- )
(set-next-null)
(first-event-exists?) invert IF
dup (as-first-event)
THEN
(last-event-exists?) IF
dup (after-last-event)
ELSE
dup (as-last-event)
THEN drop ;
: (set-eventdata) ( data-u id-u eventlink-addr -- )
eventlink.event tuck event.id ! event.data ! ;
: events.enqueue ( data-u id-u -- )
(next-free) dup >r (set-eventdata) r> (append-event) ;
: (get-eventdata) ( eventlink-addr -- data-u id-u )
eventlink.event dup event.data @ swap event.id @ ;
: (assert-first-exists) ( -- )
(first-event-exists?) invert abort" no events in queue" ;
: (check-first-and-last) ( -- )
first-event @ 0= IF
0 last-event !
THEN ;
: (get-first-event) ( -- eventlink-addr )
first-event @ ;
: (free-event) ( eventlink-addr -- )
dup eventlink.next free-event @ swap !
free-event ! ;
: (set-first-event-to-next) ( -- )
first-event @ eventlink.next @ first-event !
(check-first-and-last) ;
: events.dequeue ( -- data-u id-u )
(assert-first-exists) (get-first-event) (set-first-event-to-next)
dup (free-event) (get-eventdata) ;
: events.has-item? ( -- flag ) (first-event-exists?) ;
\ Clear events, initialize events array.
events.clear

18
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require check-gforth.4th
require eventloop.4th
require event-constants.4th
require server.4th
: custom-eventloop ( -- )
BEGIN
eventloop.has-events? IF
eventloop.dispatch
ELSE
server-idle? IF
10 ms false server-idle!
THEN
0 0 events.enqueue eventloop.dispatch
THEN
AGAIN ;
' custom-eventloop catch close-server throw

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variable sendbuffer-len 0 sendbuffer-len !
2048 constant SENDBUFFER_SIZE
create sendbuffer SENDBUFFER_SIZE allot
\ Calling C here is just optimization.
c-library sanitizelib
\c void csanitize(char *buffer, int buffersize) {
\c int lastIsNewline = buffer[buffersize-1] == '\n' ? 1 : 0;
\c for(int i = 0; i<buffersize; i++) {
\c if(buffer[i]<32 || buffer[i]>127) { buffer[i] = '?'; }
\c }
\c if(lastIsNewline) { buffer[buffersize-1] = '\n'; }
\c return;
\c }
c-function csanitize csanitize a n -- void
end-c-library
: sendbuffer-reset ( -- ) 0 sendbuffer-len ! ;
: (overflow?) ( n -- flag )
sendbuffer-len @ + SENDBUFFER_SIZE u> ;
: (append) ( str -- )
dup -rot sendbuffer sendbuffer-len @ + swap move
sendbuffer-len +! ;
: sendbuffer-append ( str -- )
dup (overflow?) abort" sendbuffer overflow" (append) ;
: sendbuffer-sanitize ( -- )
sendbuffer sendbuffer-len @ csanitize ;
: sendbuffer@ ( -- str ) sendbuffer sendbuffer-len @ ;

230
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require unix/socket.fs
require socket-extensions.4th
require connections.4th
require sendbuffer.4th
AF_INET constant SERVER_SOCKET_DOMAIN
SOCK_STREAM
SOCK_NONBLOCK or
constant SERVER_SOCKET_TYPE
0 constant SERVER_SOCKET_PROTOCOL
0 constant SERVER_ADDR
50000 constant SERVER_PORT
128 constant SERVER_LISTEN_BACKLOG
\ Listening file descriptor.
variable listenfd
0 listenfd !
\ Idle detection.
variable idle false idle !
: server-idle? ( -- flag ) idle @ ;
: server-idle! ( flag -- ) idle ! ;
\ Temporary structs.
create con /CONNECTION allot
create saddr /sockaddr_in allot
create optval /option_value allot
: (assert-setsockopt) ( result-n -- )
0< abort" making socket reusable failed" ;
: (optval-true!) ( -- )
1 optval l! ;
: (make-reusable) ( socket-fd-n -- )
(optval-true!)
SOL_SOCKET SO_REUSEADDR optval /option_value setsockopt (assert-setsockopt) ;
: (saddr!) ( protocol-n sin_addr-n port-n -- )
htons saddr port w!
saddr sin_addr l!
saddr family w! ;
: (assert-socket) ( result-n -- result-n )
dup 0< abort" socket() failed." ;
: (assert-bind) ( result-n -- )
0< abort" bind failed." ;
: (assert-listen) ( result-n -- )
0< abort" listen failed." ;
: (erase-saddr) ( -- )
saddr /sockaddr_in erase ;
: (create-socket) ( -- )
SERVER_SOCKET_DOMAIN
SERVER_SOCKET_TYPE
SERVER_SOCKET_PROTOCOL
socket (assert-socket) listenfd ! ;
: (make-socket-reusable) ( -- )
listenfd @ (make-reusable) ;
: (set-saddr) ( -- )
SERVER_SOCKET_DOMAIN SERVER_ADDR SERVER_PORT (saddr!) ;
: (bind-socket) ( -- )
listenfd @ saddr /sockaddr_in bind (assert-bind) ;
: (listen-socket) ( -- )
listenfd @ SERVER_LISTEN_BACKLOG listen() (assert-listen) ;
: (server-info) ( -- )
cr cr ." Server listening at port: " SERVER_PORT . cr ;
: initialize-server ( -- )
(erase-saddr)
(create-socket)
(make-socket-reusable)
(set-saddr)
(bind-socket)
(listen-socket)
(server-info) ;
: (perform-disconnect) ( connection-addr -- )
dup connection.connected false swap !
connection.fd @ close() throw ;
: (close-clients) ( -- )
connections.count 0= IF
EXIT
THEN
connections.count 0 DO
I connections.at connection.connected @ true = IF
I connections.at (perform-disconnect)
THEN
LOOP ;
: (assert-close()) ( result-n -- )
0<> abort" close failed" ;
: (close-server) ( -- )
listenfd @ close() (assert-close()) ;
: (close-server-info) ( -- )
cr ." Closed server connections." cr ;
: close-server ( -- )
(close-clients) (close-server) (close-server-info) ;
: (queue-disconnect) ( connection-addr -- )
dup (perform-disconnect) EVENT_CONNECTION_CLOSED events.enqueue ;
: (try-accept) ( -- c-result-n )
listenfd @ 0 0 accept() ;
: (accept-error) ( accept-result-n -- )
errno EAGAIN <> abort" accept error" drop ;
: (erase-connection) ( connection-addr -- )
/CONNECTION erase ;
: (set-connection-number) ( -- )
connections.last dup connections.indexOf 1+ swap connection.number ! ;
: (enqueue-new-connection) ( -- )
connections.last EVENT_CONNECTION_NEW events.enqueue ;
: (store-connection) ( connection-addr -- )
dup >r connections.append IF
(set-connection-number)
(enqueue-new-connection)
rdrop
ELSE
." Warning: failed to store connection, disconnecting client." cr
r> (perform-disconnect)
THEN ;
: (con!) ( fd-n connected-flag -- )
con connection.connected !
con connection.fd ! ;
: (accept-connection) ( fd-n -- )
con (erase-connection)
true (con!)
con (store-connection) ;
: (server-idle-accept) ( -- )
(try-accept) dup 0< IF
(accept-error)
ELSE
(accept-connection)
THEN ;
: (connected?) ( connection-addr -- flag )
connection.connected @ ;
: (try-recv) ( connection-addr -- recv-result-n )
dup connection.fd @
swap connection.buffer
CONNECTION_BUFFER_SIZE
MSG_DONTWAIT
recv ;
: (recv-error?) ( c-result-n -- flag ) 0< ;
: (recv) ( recv-result-n connection-addr -- )
2dup connection.bufferlen ! swap
0> IF
EVENT_CONNECTION_RECV events.enqueue
ELSE \ disconnected
(queue-disconnect)
THEN
;
: (recv-warning) ( -- ) ." Warning: recv failed, disconnecting client." cr ;
: (recv-error) ( recv-result-n connection-addr -- )
errno EAGAIN <> IF
(queue-disconnect) drop
(recv-warning)
ELSE
2drop
THEN ;
: (connection-recv) ( connection-addr -- )
dup (try-recv) tuck (recv-error?) IF
(recv-error)
ELSE
(recv)
THEN ;
: (server-idle-recv) ( -- )
true server-idle!
connections.count 0= IF
EXIT
THEN
connections.count 0 DO
I connections.at dup (connected?) IF
(connection-recv)
ELSE
drop
THEN
LOOP ;
: server-idle-accept ( eventdata-n eventid-n -- )
2drop (server-idle-accept) ;
: server-idle-recv ( eventdata-n eventid-n -- )
2drop (server-idle-recv) ;
: server-connection-new ( connection-addr eventid-n -- )
2drop ." New client connected!" cr ;
: server-connection-closed ( connection-addr eventid-n -- )
2drop ." Client disconnected." cr ;
: (to-string) ( n -- addr c ) s>d <# #s #> ;
: (connectionnumber@) ( connection-addr -- c-addr u )
connection.number @ (to-string) ;
: (connectionbuffer@) ( connection-addr -- c-addr u )
dup connection.buffer swap connection.bufferlen @ ;
: (format-sendbuffer) ( from-connection-addr -- )
>r sendbuffer-reset
s" Anon " sendbuffer-append
r@ (connectionnumber@) sendbuffer-append
s" : " sendbuffer-append
r> (connectionbuffer@) sendbuffer-append
sendbuffer-sanitize ;
: (connected?) ( connection-addr -- )
connection.connected @ ;
: (different-connection?) ( from-connection-addr to-connection-addr -- )
<> ;
: (send?) ( from-connection-addr to-connection-addr -- )
tuck (different-connection?) swap (connected?) and ;
: (check-send) ( result-n -- )
0< IF ." Warning: send failed." cr THEN ;
: (send) ( from-connection-addr to-connection-addr -- )
nip connection.fd @ sendbuffer@ 0 send (check-send) ;
: (try-send) ( from-connection-addr to-connection-addr -- )
2dup (send?) IF
(send)
ELSE
2drop
THEN ;
: server-recv ( from-connection-addr eventid-n )
drop dup (format-sendbuffer)
connections.count 0 DO
dup I connections.at (try-send)
LOOP drop ;
' server-idle-accept EVENT_IDLE eventhandlers.append
' server-idle-recv EVENT_IDLE eventhandlers.append
' server-connection-new EVENT_CONNECTION_NEW eventhandlers.append
' server-connection-closed EVENT_CONNECTION_CLOSED eventhandlers.append
' server-recv EVENT_CONNECTION_RECV eventhandlers.append
initialize-server

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\ Gforth 0.7.3 doesn't seem to have these defined.
2 Constant AF_INET
$40 Constant MSG_DONTWAIT
2048 constant SOCK_NONBLOCK
1 constant SOL_SOCKET
2 Constant SO_REUSEADDR
11 constant EAGAIN
\ Just some size definitions for the C structs / values.
sockaddr_in nip constant /sockaddr_in
4 constant /option_value
\ C FFI for functions which aren't defined in unix/socket.fs
c-library socketext
c-function close() close n -- n ( fd -- result )
c-function setsockopt setsockopt n n n a n -- n ( sockfd level optname optval optlen -- r )
end-c-library