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implement Register;
#
# Copyright © 2003 Vita Nuova Holdings Limited. All rights reserved.
#
include "sys.m";
sys: Sys;
include "draw.m";
include "sh.m";
include "registries.m";
registries: Registries;
Registry, Attributes, Service: import registries;
include "grid/announce.m";
announce: Announce;
include "arg.m";
registered: ref Registries->Registered;
Register: module {
init: fn(ctxt: ref Draw->Context, argv: list of string);
};
init(ctxt: ref Draw->Context, argv: list of string)
{
sys = load Sys Sys->PATH;
sys->pctl(sys->FORKNS | sys->NEWPGRP, nil);
registries = load Registries Registries->PATH;
if (registries == nil)
badmod(Registries->PATH);
registries->init();
announce = load Announce Announce->PATH;
if (announce == nil)
badmod(Announce->PATH);
announce->init();
arg := load Arg Arg->PATH;
if (arg == nil)
badmod(Arg->PATH);
attrs := Attributes.new(("proto", "styx") :: ("auth", "none") :: ("resource","Cpu Pool") :: nil);
maxusers := -1;
autoexit := 0;
myaddr := "";
arg->init(argv);
arg->setusage("register [-u maxusers] [-e exit threshold] [-a attributes] { program }");
while ((opt := arg->opt()) != 0) {
case opt {
'm' =>
attrs.set("memory", memory());
'u' =>
if ((maxusers = int arg->earg()) <= 0)
arg->usage();
'e' =>
if ((autoexit = int arg->earg()) < 0)
arg->usage();
'A' =>
myaddr = arg->earg();
'a' =>
attr := arg->earg();
val := arg->earg();
attrs.set(attr, val);
}
}
argv = arg->argv();
if (argv == nil)
arg->usage();
(nil, plist) := sys->tokenize(hd argv, "{} \t\n");
arg = nil;
sysname := readfile("/dev/sysname");
reg: ref Registry;
reg = Registry.new("/mnt/registry");
if (reg == nil)
reg = Registry.connect(nil, nil, nil);
if (reg == nil)
error(sys->sprint("Could not find registry: %r\nMake sure that ndb/cs has been started and there is a registry announcing on the machine specified in /lib/ndb/local"));
c : sys->Connection;
if (myaddr == nil) {
(addr, conn) := announce->announce();
if (addr == nil)
error(sys->sprint("cannot announce: %r"));
myaddr = addr;
c = *conn;
}
else {
n: int;
(n, c) = sys->announce(myaddr);
if (n == -1)
error(sys->sprint("cannot announce: %r"));
(n, nil) = sys->tokenize(myaddr, "*");
if (n > 1) {
(nil, lst) := sys->tokenize(myaddr, "!");
if (len lst >= 3)
myaddr = "tcp!" + sysname +"!" + hd tl tl lst;
}
}
persist := 0;
if (attrs.get("name") == nil)
attrs.set("name", sysname);
err: string;
(registered, err) = reg.register(myaddr, attrs, persist);
if (err != nil)
error("could not register with registry: "+err);
mountfd := popen(ctxt, plist);
spawn listener(c, mountfd, maxusers);
}
listener(c: Sys->Connection, mountfd: ref sys->FD, maxusers: int)
{
for (;;) {
(n, nc) := sys->listen(c);
if (n == -1)
error(sys->sprint("listen failed: %r"));
dfd := sys->open(nc.dir + "/data", Sys->ORDWR);
if (maxusers != -1 && nusers >= maxusers)
sys->fprint(stderr(), "register: maxusers (%d) exceeded!\n", nusers);
else if (dfd != nil) {
sync := chan of int;
addr := readfile(nc.dir + "/remote");
if (addr == nil)
addr = "unknown";
if (addr[len addr - 1] == '\n')
addr = addr[:len addr - 1];
spawn proxy(sync, dfd, mountfd, addr);
<-sync;
}
}
}
proxy(sync: chan of int, dfd, mountfd: ref sys->FD, addr: string)
{
pid := sys->pctl(Sys->NEWFD | Sys->NEWNS, 1 :: 2 :: mountfd.fd :: dfd.fd :: nil);
dfd = sys->fildes(dfd.fd);
mountfd = sys->fildes(mountfd.fd);
sync <-= 1;
done := chan of int;
spawn exportit(dfd, done);
if (sys->mount(mountfd, nil, "/", sys->MREPL | sys->MCREATE, addr) == -1)
sys->fprint(stderr(), "register: proxy mount failed: %r\n");
nusers++;
<-done;
nusers--;
}
nusers := 0;
clock(tick: chan of int)
{
for (;;) {
sys->sleep(2000);
tick <-= 1;
}
}
exportit(dfd: ref sys->FD, done: chan of int)
{
sys->export(dfd, "/", sys->EXPWAIT);
done <-= 1;
}
popen(ctxt: ref Draw->Context, argv: list of string): ref Sys->FD
{
sync := chan of int;
fds := array[2] of ref Sys->FD;
sys->pipe(fds);
spawn runcmd(ctxt, argv, fds[0], sync);
<-sync;
return fds[1];
}
runcmd(ctxt: ref Draw->Context, argv: list of string, stdin: ref Sys->FD, sync: chan of int)
{
pid := sys->pctl(Sys->FORKFD, nil);
sys->dup(stdin.fd, 0);
stdin = nil;
sync <-= 0;
sh := load Sh Sh->PATH;
sh->run(ctxt, argv);
}
error(e: string)
{
sys->fprint(stderr(), "register: %s\n", e);
raise "fail:error";
}
user(): string
{
if ((s := readfile("/dev/user")) == nil)
return "none";
return s;
}
readfile(f: string): string
{
fd := sys->open(f, sys->OREAD);
if(fd == nil)
return nil;
buf := array[8192] of byte;
n := sys->read(fd, buf, len buf);
if(n < 0)
return nil;
return string buf[0:n];
}
stderr(): ref Sys->FD
{
return sys->fildes(2);
}
badmod(path: string)
{
sys->fprint(stderr(), "Register: cannot load %s: %r\n", path);
exit;
}
killg(pid: int)
{
if ((fd := sys->open("/prog/" + string pid + "/ctl", Sys->OWRITE)) != nil) {
sys->fprint(fd, "killgrp");
fd = nil;
}
}
memory(): string
{
buf := array[1024] of byte;
s := readfile("/dev/memory");
(nil, lst) := sys->tokenize(s, " \t\n");
if (len lst > 2) {
mem := int hd tl lst;
mem /= (1024*1024);
return string mem + "mb";
}
return "not known";
}
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