ref: d09cf07a82cf4ffb846a31d0384e774b4c4661e1
dir: /appl/spree/engines/gather.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;
Attributes, Range, Object, Clique, Member, rand: import spree;
include "daytime.m";
daytime: Daytime;
include "../gather.m";
clique: ref Clique;
started := 0;
halted := 0;
suspended: Set; # set of members currently suspended from the clique.
count := 0;
nmembers := 0;
title := "unknown";
cliquemod: Gatherengine;
members: Set;
watchers: Set;
invited: list of string;
# options:
# <n> cliquemodule opts
init(srvmod: Spree, g: ref Clique, argv: list of string): string
{
sys = load Sys Sys->PATH;
clique = g;
spree = srvmod;
sets = load Sets Sets->PATH;
if (sets == nil) {
sys->print("gather: cannot load %s: %r\n", Sets->PATH);
return "bad module";
}
sets->init();
daytime = load Daytime Daytime->PATH;
if (daytime == nil) {
sys->print("gather: cannot load %s: %r\n", Daytime->PATH);
return "bad module";
}
archives = load Archives Archives->PATH;
if (archives == nil) {
sys->print("gather: cannot load %s: %r\n", Archives->PATH);
return "bad module";
}
archives->init(srvmod);
argv = tl argv;
n := len argv;
if (n < 2)
return "bad init options";
count = int hd argv;
if (count != -1 && count <= 0)
return "bad gather count";
argv = tl argv;
if (count < len clique.archive.members)
count = len clique.archive.members;
cliquemod = load Gatherengine "/dis/spree/engines/" + hd argv + ".dis";
if (cliquemod == nil)
return sys->sprint("bad module: %r");
title = concat(argv);
e := cliquemod->init(srvmod, clique, tl argv, len clique.archive.members > 0);
if (e != nil)
return e;
if (len clique.archive.members > 0) {
for (i := 0; i < len clique.archive.members; i++)
invited = clique.archive.members[i] :: invited;
} else
invited = clique.owner() :: nil;
for (inv := invited; inv != nil; inv = tl inv)
clique.notify(clique.parentid, "invite " + hd inv);
clique.notify(clique.parentid, "title (" + title + ")");
return nil;
}
join(p: ref Member, cmd: string, susp: int): string
{
sys->print("gather: %s[%d] joining '%s' (suspended: %d)\n", p.name, p.id, cmd, susp);
case cmd {
"join" =>
if (started) {
if (!susp || !halted)
return "clique has already started";
suspended = suspended.del(p.id);
if (suspended.eq(None)) {
halted = 0;
# XXX inform participants that clique is starting again
}
pset := None.add(p.id);
clique.action("clienttype " + cliquemod->clienttype(), nil, nil, pset);
clique.breakmsg(pset);
return nil;
}
for (inv := invited; inv != nil; inv = tl inv)
if (hd inv == p.name || hd inv == "all")
break;
if (inv == nil)
return "you have not been invited";
if (nmembers >= cliquemod->maxmembers() || (count != -1 && nmembers >= count))
return "too many members already";
if (len clique.archive.members > 0) {
for (i := 0; i < len clique.archive.members; i++)
if (p.name == clique.archive.members[i])
break;
if (i == len clique.archive.members)
return "you are not part of that clique";
}
nmembers++;
members = members.add(p.id);
clique.notify(clique.parentid, "join " + p.name);
s := None.add(p.id);
# special case for single member cliques: don't need a gather client as we can start right now.
if (cliquemod->maxmembers() == 1)
return startclique();
clique.action("clienttype gather", nil, nil, s);
clique.breakmsg(s);
clique.action("title " + title, nil, nil, s);
clique.action("join " + p.name, nil, nil, All);
"watch" =>
if (susp)
return "you cannot watch if you are playing";
watchers = watchers.add(p.id);
s := None.add(p.id);
if (started)
clique.action("clienttype " + cliquemod->clienttype(), nil, nil, s);
else
clique.action("clienttype gather", nil, nil, s);
clique.breakmsg(s);
if (!started)
clique.action("watch " + p.name, nil, nil, All);
* =>
return "unknown join request";
}
return nil;
}
leave(p: ref Member): int
{
if (members.holds(p.id)) {
if (started) {
suspended = suspended.add(p.id);
if (suspended.eq(members)) {
cliquemod->archive();
name := spree->newarchivename();
e := archives->write(clique,
("title", concat(tl tl clique.archive.argv)) ::
("date", string daytime->now()) :: nil,
name, members);
if (e != nil)
sys->print("warning: cannot archive clique: %s\n", e);
else
clique.notify(clique.parentid, "archived " + name);
clique.hangup();
return 1;
} else {
halted = 1;
return 0;
}
}
members = members.del(p.id);
nmembers--;
clique.notify(clique.parentid, "leave " + p.name);
if (nmembers == 0)
clique.hangup();
} else {
watchers = watchers.del(p.id);
clique.action("unwatch " + p.name, nil, nil, All);
}
return 1;
}
notify(nil: int, note: string)
{
(n, toks) := sys->tokenize(note, " ");
case hd toks {
"invite" =>
invited = hd tl toks :: invited;
"uninvite" =>
inv := invited;
for (invited = nil; inv != nil; inv = tl inv)
if (hd inv != hd tl toks)
invited = hd inv :: invited;
* =>
sys->print("gather: unknown notification '%s'\n", note);
}
}
command(p: ref Member, cmd: string): string
{
if (halted)
return "clique is halted for the time being";
if (started) {
if (!members.holds(p.id)) {
sys->print("members (%s) doesn't hold %s[%d]\n", members.str(), p.name, p.id);
return "you are only watching";
}
return cliquemod->command(p, cmd);
}
(n, toks) := sys->tokenize(cmd, " \n");
if (n == 0)
return "bad command";
case hd toks {
"start" =>
if (len clique.archive.members == 0 && p.name != clique.owner())
return "only the owner can start a clique";
if (count != -1 && nmembers != count)
return "need " + string count + " members";
return startclique();
"chat" =>
clique.action("chat " + p.name + " " + concat(tl toks), nil, nil, All);
* =>
return "unknown command";
}
return nil;
}
startclique(): string
{
# XXX could randomly shuffle members here
pa := array[nmembers] of ref Member;
names := array[nmembers] of string;
j := nmembers;
for (i := members.limit(); i >= 0; i--)
if (members.holds(i)) {
pa[--j] = clique.member(i);
names[j] = pa[j].name;
}
e := cliquemod->propose(names);
if (e != nil)
return e;
clique.action("clienttype " + cliquemod->clienttype(), nil, nil, All);
clique.breakmsg(All);
cliquemod->start(pa, len clique.archive.members > 0);
clique.start();
started = 1;
clique.notify(clique.parentid, "started");
clique.notify(clique.parentid, "title " + concat(tl tl clique.archive.argv));
return nil;
}
readfile(f: int, offset: big, n: int): array of byte
{
if (!started)
return nil;
return cliquemod->readfile(f, offset, n);
}
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;
}