ref: 02ac617541ca1a7bf82b1615fb5a58235469b5d3
dir: /appl/spree/engines/lobby.b/
implement Engine;
include "sys.m";
sys: Sys;
include "draw.m";
include "sets.m";
sets: Sets;
Set, set, A, B, All, None: import sets;
include "../spree.m";
spree: Spree;
archives: Archives;
Archive: import Archives;
Attributes, Range, Object, Clique, Member, rand: import spree;
include "readdir.m";
readdir: Readdir;
# what the lobby provides:
# a list of cliques it's started
# name of clique
# current members
# list of members inside the lobby.
# name
# invites
# how does a gather engine know who's been invited?
# as the lobby's the only place with the knowledge of who's around to invite.
# could allow lobby to communicate with the cliques it's started...
# but clique also needs to communicate with the lobby
# (e.g. to say clique has started, no more invites necessary or allowed)
#
# list of available engines
# title
# clienttype(s?)
#
# understands commands:
# chat message
# invite
# new name params
#
# question: how do we know about archives?
# answer: maybe we don't... could have another module
# that does, or maybe an option to gather ("gather unarchive"?)
#
# the one that's started the clique is always invited.
# start clique.
# clique says to parent "invite x, y and z" (perhaps they were in the archive)
# how should we deal with recursive invocation?
# could queue up requests to other clique engines,
# and deliver them after the current request has been processed.
# no return available (one way channel) but maybe that's good,
# as if sometime in the future engines do run in parallel, we will
# need to avoid deadlock.
# Clique.notify(clique: self ref Clique, cliqueid: int, note: string);
# when a request has been completed, we run notify requests
# for all the cliques that have been notified, and repeat
# until no more. (could keep a count to check for infinite loop).
# don't allow communication between unrelated cliques.
clique: ref Clique;
members: ref Object;
sessions: ref Object;
available: ref Object;
archiveobj: ref Object;
ARCHIVEDIR: con "./archive";
init(srvmod: Spree, g: ref Clique, nil: list of string): string
{
sys = load Sys Sys->PATH;
clique = g;
spree = srvmod;
sets = load Sets Sets->PATH;
if (sets == nil) {
sys->print("lobby: cannot load %s: %r\n", Sets->PATH);
return "bad module";
}
readdir = load Readdir Readdir->PATH;
if (readdir == nil) {
sys->print("lobby: cannot load %s: %r\n", Readdir->PATH);
return "bad module";
}
archives = load Archives Archives->PATH;
if (archives == nil) {
sys->print("lobby: cannot load %s: %r\n", Archives->PATH);
return "bad module";
}
archives->init(srvmod);
members = clique.newobject(nil, All, "members");
sessions = clique.newobject(nil, All, "sessions");
available = clique.newobject(nil, All, "available");
o := clique.newobject(available, All, "sessiontype");
o.setattr("name", "freecell", All);
o.setattr("title", "Freecell", All);
o.setattr("clienttype", "cards", All);
o.setattr("start", "gather 1 freecell", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Lobby", All);
o.setattr("name", "lobby", All);
o.setattr("clienttype", "lobby", All);
o.setattr("start", "lobby", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Spit", All);
o.setattr("name", "spit", All);
o.setattr("clienttype", "cards", All);
o.setattr("start", "gather 2 spit", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Canfield", All);
o.setattr("name", "canfield", All);
o.setattr("clienttype", "cards", All);
o.setattr("start", "gather 1 canfield", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Afghan", All);
o.setattr("name", "afghan", All);
o.setattr("clienttype", "cards", All);
o.setattr("start", "gather 1 afghan", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Spider", All);
o.setattr("name", "spider", All);
o.setattr("clienttype", "cards", All);
o.setattr("start", "gather 1 spider", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Racing Demon", All);
o.setattr("name", "racingdemon", All);
o.setattr("clienttype", "cards", All);
o.setattr("start", "gather 3 racingdemon", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Othello", All);
o.setattr("name", "othello", All);
o.setattr("clienttype", "othello", All);
o.setattr("start", "gather 2 othello", All);
o = clique.newobject(available, All, "sessiontype");
o.setattr("title", "Whist", All);
o.setattr("name", "whist", All);
o.setattr("clienttype", "whist", All);
o.setattr("start", "gather 4 whist", All);
getarchives();
clique.start();
return nil;
}
join(p: ref Member, cmd: string, nil: int): string
{
sys->print("%s joins '%s'\n", p.name, cmd);
clique.notify(clique.parentid, "join " + p.name);
s := None.add(p.id);
clique.action("clienttype lobby", nil, nil, s);
clique.breakmsg(s);
clique.action("name " + p.name, nil, nil, s);
o := clique.newobject(members, All, "member");
o.setattr("name", p.name, All);
return nil;
}
leave(p: ref Member): int
{
clique.notify(clique.parentid, "leave " + p.name);
deletename(members, p.name, "member");
sys->print("%s leaves\n", p.name);
return 1;
}
readfile(nil: int, nil: big, nil: int): array of byte
{
return nil;
}
command(p: ref Member, cmd: string): string
{
sys->print("%s: '%s'\n", p.name, cmd);
(n, toks) := sys->tokenize(cmd, " \n");
if (n == 0)
return "bad command";
case hd toks {
"kick" =>
getarchives();
return nil;
"chat" =>
clique.action("chat " + p.name + " " + concat(tl toks), nil, nil, All);
return nil;
"start" =>
# start engine [params]
if (n >= 2) {
(gid, fname, err) := clique.new(
ref Archive(tl toks, nil, nil, nil),
p.name);
if (gid == -1)
return err;
s := addname(sessions, string gid, "session");
s.setattr("title", concat(tl toks), All);
s.setattr("filename", fname, All);
s.setattr("cliqueid", string gid, None);
s.setattr("owner", p.name, All);
return nil;
}
return "bad start params";
"invite" or
"uninvite"=>
# invite sessionid name
if (n == 3) {
(what, sessionid, name) := (hd toks, int hd tl toks, hd tl tl toks);
if ((s := p.obj(sessionid)) == nil)
return "bad object id";
if (s.objtype != "session")
return "bad session type " + s.objtype;
if (s.getattr("owner") != p.name)
return "permission denied";
clique.notify(int s.getattr("cliqueid"), what + " " + name);
if (hd toks == "invite")
addname(s, name, "invite");
else
deletename(s, name, "invite");
return nil;
}
return "bad invite params";
"unarchive" =>
# unarchive object
if (n == 2) {
o := p.obj(int hd tl toks);
if (o == nil || o.objtype != "archive")
return "bad archive object";
# archive object contains:
# name name of clique
# members members of the clique
# file filename of archive
aname := o.getattr("file");
(archive, err) := archives->read(aname);
if (archive == nil)
return sys->sprint("cannot load archive: %s", err);
for (i := 0; i < len archive.members; i++)
if (p.name == archive.members[i])
break;
if (i == len archive.members)
return "you did not participate in that session";
(gid, fname, err2) := clique.new(archive, p.name);
if (gid == -1)
return err2;
s := addname(sessions, string gid, "session");
s.setattr("title", concat(archive.argv), All);
s.setattr("filename", fname, All);
s.setattr("cliqueid", string gid, None);
s.setattr("owner", p.name, All);
o.delete();
(ok, d) := sys->stat(aname);
if (ok != -1) {
d.name += ".old";
sys->wstat(aname, d);
}
# XXX delete old archive file?
return nil;
}
return "bad unarchive params";
* =>
return "bad command";
}
}
notify(srcid: int, note: string)
{
sys->print("lobby: note from %d: %s\n", srcid, note);
s := findname(sessions, string srcid);
if (s == nil) {
sys->print("cannot find srcid %d\n", srcid);
return;
}
if (note == nil) {
s.delete();
return;
}
if (srcid == clique.parentid)
return;
(n, toks) := sys->tokenize(note, " ");
case hd toks {
"join" =>
p := addname(s, hd tl toks, "member");
"leave" =>
deletename(s, hd tl toks, "member");
"invite" =>
addname(s, hd tl toks, "invite");
"uninvite" =>
deletename(s, hd tl toks, "invite");
"title" =>
s.setattr("title", concat(tl toks), All);
"archived" =>
# archived filename
arch := clique.newobject(archiveobj, All, "archive");
arch.setattr("name", s.getattr("title"), All);
pnames := "";
for (i := 0; i < len s.children; i++)
if (s.children[i].objtype == "member")
pnames += " " + s.children[i].getattr("name");
if (pnames != nil)
pnames = pnames[1:];
arch.setattr("members", pnames, All);
arch.setattr("file", hd tl toks, None);
* =>
sys->print("unknown note from %d: %s\n", srcid, note);
}
}
addname(o: ref Object, name: string, otype: string): ref Object
{
x := clique.newobject(o, All, otype);
x.setattr("name", name, All);
return x;
}
findname(o: ref Object, name: string): ref Object
{
c := o.children;
for (i := 0; i < len c; i++)
if (c[i].getattr("name") == name)
return c[i];
return nil;
}
deletename(o: ref Object, name: string, objtype: string)
{
c := o.children;
for (i := 0; i < len c; i++)
if (c[i].objtype == objtype && c[i].getattr("name") == name) {
o.deletechildren((i, i+1));
break;
}
}
getarchives()
{
if (archiveobj == nil)
archiveobj = clique.newobject(nil, All, "archives");
else
archiveobj.deletechildren((0, len archiveobj.children));
for (names := spree->archivenames(); names != nil; names = tl names) {
fname := hd names;
(a, err) := archives->readheader(fname);
if (a == nil) {
sys->print("lobby: cannot read archive header on %s: %s\n", fname, err);
continue;
}
title := "";
for (inf := a.info; inf != nil; inf = tl inf) {
if ((hd inf).t0 == "title") {
title = (hd inf).t1;
break;
}
}
if (title == nil)
title = concat(a.argv);
arch := clique.newobject(archiveobj, All, "archive");
arch.setattr("name", title, All);
arch.setattr("members", concatarray(a.members), All);
arch.setattr("file", fname, None);
j := 0;
for (info := a.info; info != nil; info = tl info)
arch.setattr("info" + string j++, (hd info).t0 + " " + (hd info).t1, All);
}
}
concat(l: list of string): string
{
if (l == nil)
return nil;
s := hd l;
for (l = tl l; l != nil; l = tl l)
s += " " + hd l;
return s;
}
concatarray(a: array of string): string
{
if (len a == 0)
return nil;
s := a[0];
for (i := 1; i < len a; i++)
s += " " + a[i];
return s;
}