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|
package NDB::Net::Config;
use strict;
use Carp;
use Symbol;
use Socket;
use Errno;
use XML::Parser;
require NDB::Net::Base;
use vars qw(@ISA);
@ISA = qw(NDB::Net::Base);
# constructors
my $log;
sub initmodule {
$log = NDB::Util::Log->instance;
}
NDB::Net::Config->attributes(
file => sub { /^\S+$/ },
loadtime => sub { /^\d+$/ },
);
sub new {
my $class = shift;
@_ % 2 == 0 or confess 0+@_;
my(%attr) = @_;
my $netcfg = $class->SUPER::new(%attr);
$netcfg->setfile($attr{file})
or $log->put, return undef;
return $netcfg;
}
sub desc {
my $netcfg = shift;
return $netcfg->getfile;
}
use vars qw(@context);
sub handle_start {
my($parser, $tag, %attr) = @_;
my $p = $context[-1];
my $q = {};
$p->{$tag} ||= [];
push(@{$p->{$tag}}, $q);
for my $k (keys %attr) {
$q->{$k} = $attr{$k};
}
push(@context, $q);
return 1;
}
sub handle_end {
my($parser, $tag, %attr) = @_;
pop(@context);
return 1;
}
sub load {
my $netcfg = shift;
my $file = $netcfg->getfile;
my @s;
while (1) {
if (@s = stat($file)) {
last;
}
$log->put("$file: stat failed: $!");
if (! $!{ESTALE}) {
return undef;
}
$log->put("(retry)")->info;
sleep 1;
}
if ($s[9] <= $netcfg->getloadtime(0)) {
return 1;
}
my $fh = gensym();
if (! open($fh, "<$file")) {
$log->put("$file: open for read failed: $!");
return undef;
}
my $text = "";
my $line;
while (defined($line = <$fh>)) {
$text .= $line;
}
close($fh);
my $parser = XML::Parser->new(
ParseParamEnt => 1,
Handlers => {
Start => \&handle_start,
End => \&handle_end,
},
);
delete $netcfg->{config};
local @context = ($netcfg);
$parser->parse($text);
$netcfg->{text} = $text;
$netcfg->{config} = $netcfg->{config}[0];
$netcfg->setloadtime(time)
or $log->push, return undef;
NDB::Net::Server->deleteall;
NDB::Net::Database->deleteall;
NDB::Net::Node->deleteall;
return 1;
}
sub getservers {
my $netcfg = shift;
@_ == 0 or confess 0+@_;
my $servers = [];
my $slist = $netcfg->{config}{server} || [];
for my $s (@$slist) {
my $server;
$server = NDB::Net::ServerINET->get($s->{id});
if (! $server) {
$server = NDB::Net::ServerINET->new(%$s);
if (! $server) {
$log->push($netcfg)->warn;
next;
}
}
push(@$servers, $server);
}
return $servers;
}
sub getdatabases {
my $netcfg = shift;
@_ == 0 or confess 0+@_;
my $databases = [];
my $dlist = $netcfg->{config}{database} || [];
for my $d (@$dlist) {
if ($d->{isproto} eq "y") {
next;
}
if ($d->{name} !~ /^\w(\w|-)*$/) {
$log->put("$d->{name}: invalid db name")->push($netcfg)->warn;
next;
}
my $db = $netcfg->getdatabase($d->{name});
if (! $db) {
$log->push->warn;
next;
}
push(@$databases, $db);
}
return $databases;
}
sub getdatabase {
my $netcfg = shift;
@_ == 1 or confess 0+@_;
my($name) = @_;
$netcfg->getservers or return undef; # cache them
my $default = $netcfg->{config}{default}[0] || {};
my $db;
my $dlist = $netcfg->{config}{database} || [];
my $nlist;
for my $d (@$dlist) {
($d->{name} ne $name) && next;
if ($d->{isproto} eq "y") {
next;
}
my %attr = (%$default, %$d);
$db = NDB::Net::Database->new(%attr);
if (! $db) {
$log->push($netcfg);
return undef;
}
if ($d->{proto}) {
if ($d->{isproto} eq "y") {
$log->put("$name: prototypes cannot be recursive");
return undef;
}
for my $d2 (@$dlist) {
($d2->{name} ne $d->{proto}) && next;
if ($d2->{isproto} ne "y") {
$log->put("$name: $d2->{name} is not a prototype");
return undef;
}
if (! $d->{node}) {
$d->{node} = $d2->{node};
}
last;
}
}
$nlist = $d->{node} || [];
last;
}
if (! $db) {
$log->put("$name: no such db")->push($netcfg);
return undef;
}
if (! @$nlist) {
$log->put("$name: empty node list")->push($netcfg);
return undef;
}
for my $n (@$nlist) {
my $node;
try: {
my $server = NDB::Net::Server->get($n->{server})
or last try;
my %attr = (%$n, db => $db, server => $server);
my $type = $attr{type};
if ($type eq 'db') {
$node = NDB::Net::NodeDb->new(%attr)
or last try;
}
if ($type eq 'mgmt') {
$node = NDB::Net::NodeMgmt->new(%attr)
or last try;
}
if ($type eq 'api') {
$node = NDB::Net::NodeApi->new(%attr)
or last try;
}
$log->put("bad node type '$type'");
}
if (! $node) {
$log->push($netcfg);
$db->delete;
return undef;
}
}
return $db;
}
1;
# vim:set sw=4:
|
