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#include <u.h>
#include <libc.h>
#include <ip.h>
#include <thread.h>
#include <draw.h>
#include <geometry.h>
#include "dat.h"
#include "fns.h"
int debug;
Lobby *lobby;
Party theparty;
void
threadlisten(void *arg)
{
uchar buf[MTU], *p, *e;
int fd, n;
ushort rport, lport;
ulong kdown;
Ioproc *io;
Frame *frame;
fd = *(int*)arg;
io = ioproc();
frame = emalloc(sizeof(Frame));
while((n = ioread(io, fd, buf, sizeof buf)) > 0){
p = buf;
e = buf+n;
unpack(p, e-p, "F", frame);
rport = frame->udp->rport[0]<<8 | frame->udp->rport[1];
lport = frame->udp->lport[0]<<8 | frame->udp->lport[1];
unpack(frame->data, frame->len, "k", &kdown);
if(debug)
fprint(2, "%I!%d → %I!%d | %d (%d) rcvd seq %ud ack %ud id %ud len %ud %.*lub\n",
frame->udp->raddr, rport, frame->udp->laddr, lport, threadid(), getpid(), frame->seq, frame->ack, frame->id, frame->len, sizeof(kdown)*8, kdown);
}
closeioproc(io);
}
void
broadcaststate(void)
{
int i, n;
uchar buf[1024];
Player *player;
Party *p;
for(p = theparty.next; p != &theparty; p = p->next){
n = pack(buf, sizeof buf, "PdPdP",
p->u->ships[0].p, p->u->ships[0].θ,
p->u->ships[1].p, p->u->ships[1].θ,
p->u->star.p);
for(i = 0; i < nelem(p->players); i++){
if(write(p->players[i].conn.data, buf, n) != n){
player = &p->players[i^1];
lobby->takeseat(lobby, player->conn.dir, player->conn.ctl, player->conn.data);
/* step back and delete the spoiled party */
p = p->prev;
delparty(p->next);
break;
}
}
}
}
void
threadsim(void *)
{
uvlong then, now;
double frametime, Δt;
Ioproc *io;
Player couple[2];
Party *p;
Δt = 0.01;
then = nanosec();
io = ioproc();
for(;;){
lobby->purge(lobby);
if(lobby->getcouple(lobby, couple) != -1){
newparty(&theparty, couple);
theparty.prev->u->reset(theparty.prev->u);
}
now = nanosec();
frametime = now - then;
then = now;
for(p = theparty.next; p != &theparty; p = p->next){
p->u->timeacc += frametime/1e9;
while(p->u->timeacc >= Δt){
p->u->step(p->u, Δt);
p->u->timeacc -= Δt;
p->u->t += Δt;
}
}
broadcaststate();
iosleep(io, HZ2MS(70));
}
}
void
fprintstats(int fd)
{
ulong nparties = 0;
Party *p;
for(p = theparty.next; p != &theparty; p = p->next)
nparties++;
fprint(fd, "curplayers %lud\n"
"totplayers %lud\n"
"maxplayers %lud\n"
"curparties %lud\n"
"totparties %lud\n",
lobby->nseats, (ulong)0, lobby->cap,
nparties, (ulong)0);
}
void
fprintstates(int fd)
{
ulong i = 0;
Party *p;
Ship *s;
for(p = theparty.next; p != &theparty; p = p->next, i++){
for(s = &p->u->ships[0]; s-p->u->ships < nelem(p->u->ships); s++){
fprint(fd, "%lud s%lld k%d p %v v %v θ %g ω %g m %g f %d\n",
i, s-p->u->ships, s->kind, s->p, s->v, s->θ, s->ω, s->mass, s->fuel);
}
fprint(fd, "%lud S p %v m %g\n", i, p->u->star.p, p->u->star.mass);
}
}
/* Command & Control */
void
threadC2(void *)
{
int fd, pfd[2], n, ncmdargs;
char buf[256], *usr, *cmdargs[2];
Ioproc *io;
if(pipe(pfd) < 0)
sysfatal("pipe: %r");
usr = getenv("user");
snprint(buf, sizeof buf, "/srv/muswctl.%s.%d", usr, getpid());
free(usr);
fd = create(buf, OWRITE|ORCLOSE|OCEXEC, 0600);
if(fd < 0)
sysfatal("open: %r");
fprint(fd, "%d", pfd[0]);
close(pfd[0]);
io = ioproc();
while((n = ioread(io, pfd[1], buf, sizeof(buf)-1)) > 0){
buf[n] = 0;
ncmdargs = tokenize(buf, cmdargs, 2);
if(ncmdargs == 2){
if(strcmp(cmdargs[0], "show") == 0){
if(strcmp(cmdargs[1], "stats") == 0)
fprintstats(pfd[1]);
else if(strcmp(cmdargs[1], "states") == 0)
fprintstates(pfd[1]);
}
}
}
closeioproc(io);
}
void
usage(void)
{
fprint(2, "usage: %s [-d] [-a addr]\n", argv0);
threadexitsall("usage");
}
void
threadmain(int argc, char *argv[])
{
int acfd, adfd;
char adir[40], *addr, aux[64];
GEOMfmtinstall();
fmtinstall('I', eipfmt);
addr = "udp!*!112";
ARGBEGIN{
case 'a':
addr = EARGF(usage());
break;
case 'd':
debug++;
break;
default:
usage();
}ARGEND;
if(argc != 0)
usage();
acfd = announce(addr, adir);
if(acfd < 0)
sysfatal("announce: %r");
/* we don't want a line per client. we want it RAW */
if(fprint(acfd, "headers") < 0)
sysfatal("couldn't set udp headers option: %r");
snprint(aux, sizeof aux, "%s/data", adir);
adfd = open(aux, ORDWR);
if(adfd < 0)
sysfatal("open: %r");
if(debug)
fprint(2, "listening on %s\n", addr);
lobby = newlobby();
initparty(&theparty);
threadcreate(threadC2, nil, 4096);
threadcreate(threadlisten, &adfd, 4096);
threadcreate(threadsim, nil, 4096);
threadexits(nil);
}
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