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|
package NDB::Net::Server;
use strict;
use Carp;
use Socket;
require NDB::Net::Base;
use vars qw(@ISA);
@ISA = qw(NDB::Net::Base);
# constructors
my $log;
sub initmodule {
$log = NDB::Util::Log->instance;
}
my %servercache = ();
NDB::Net::Server->attributes(
id => sub { s/^\s+|\s+$//g; m/^\S+$/ && ! m!/! },
domain => sub { $_ == PF_UNIX || $_ == PF_INET },
);
sub desc {
my $server = shift;
my $id = $server->getid;
return "server $id";
}
sub add {
my $server = shift;
@_ % 2 == 0 or confess 0+@_;
my(%attr) = @_;
if ($servercache{$server->getid}) {
$log->put("duplicate server")->push($server);
return undef;
}
$servercache{$server->getid} = $server;
return 1;
}
sub get {
my $class = shift;
@_ == 1 or confess 0+@_;
my($id) = @_;
$id =~ s/^\s+|\s+$//g;
my $server = $servercache{$id};
if (! $server) {
$log->put("$id: undefined server");
return undef;
}
$log->put("found")->push($server)->debug;
return $server;
}
sub delete {
my $server = shift;
delete $servercache{$server->getid};
}
sub deleteall {
my $class = shift;
for my $id (sort keys %servercache) {
my $server = $servercache{$id};
$server->delete;
}
}
# local server is this server process
my $localserver;
sub setlocal {
my $server = shift;
@_ == 0 or confess 0+@_;
$localserver = $server;
}
sub islocal {
my $server = shift;
@_ == 0 or confess 0+@_;
return $localserver eq $server;
}
# client side
sub testconnect {
my $server = shift;
@_ == 0 or confess 0+@_;
my $socket = $server->connect or
$log->push($server), return undef;
$socket->close;
return 1;
}
sub request {
my $server = shift;
@_ == 1 or confess 0+@_;
my($cmd) = @_;
unless (ref($cmd) && $cmd->isa('NDB::Net::Command')) {
confess 'oops';
}
my $socket = $server->connect
or $log->push($server), return undef;
anon: {
my $line = $cmd->getline;
my $n = $socket->write("$line\n");
defined($n) && $n == length("$line\n")
or $log->push($server), return undef;
shutdown($socket->{fh}, 1);
}
my $value;
try: {
my $last;
loop: {
my $line = $socket->readline;
defined($line)
or $log->push($server), last try;
if ($socket->getreadend) {
last loop;
}
while (chomp($line)) {}
$log->put($line)->user
unless $log->hasvalue($line);
$last = $line;
redo loop;
}
if (! $log->hasvalue($last)) {
$log->put("missing return value in \"$last\"")->push($server);
last try;
}
$value = $log->getvalue($last);
defined($value)
or $log->push, last try;
$value = $value->[0];
if (! defined($value)) {
$log->put("failed")->push($cmd);
last try;
}
}
$socket->close;
return $value;
}
1;
# vim:set sw=4:
|
