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# -*- Mode: Perl -*- |
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# $Basename: Server.pm $ |
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# $Revision: 1.5 $ |
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# ITIID : $ITI$ $Header $__Header$ |
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# Author : Ulrich Pfeifer |
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# Created On : Sat Sep 28 13:53:36 1996 |
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# Last Modified By: Ulrich Pfeifer |
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# Last Modified On: Sun Nov 22 18:44:38 1998 |
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# Language : CPerl |
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# Update Count : 280 |
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# Status : Unknown, Use with caution! |
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# |
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# Copyright (c) 1996-1997, Ulrich Pfeifer |
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# |
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|
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package WAIT::Server; |
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use vars qw($VERSION @ISA @EXPORT); |
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use WAIT::Config; |
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use IO::Socket; |
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use IO::Select; |
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use strict; |
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use sigtrap qw(handler IGNORE error-signals); |
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require Exporter; |
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@ISA = qw(Exporter); |
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@EXPORT = qw(server); |
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|
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my($ver) = '$ProjectVersion: 18.1 $ ' =~ /([\d.]+)/; $VERSION = sprintf '%5.3f', $ver/10; |
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|
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sub server { |
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my %opt = @_; |
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my $port = $opt{port} || $WAIT::Config->{port} || 1404; |
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|
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my $lsn = new WAIT::Handle(Reuse => 1, |
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Listen => 5, |
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LocalPort => $port, |
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Proto => 'tcp'); |
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die "Could not connect to port $port: $!\n" unless defined $lsn; |
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|
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my $SEL = new IO::Select( $lsn ); |
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my %CON; |
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my $fh; |
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my @ready; |
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|
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print "listening on port $port\n"; |
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|
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while(1) { |
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alarm(0); |
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@ready = $SEL->can_read; |
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#printf STDERR "=== %s %s\n", unpack ('b*', $SEL->[0]), join ':', @ready; |
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#sleep 1; |
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REQUEST: |
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alarm(25); |
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foreach $fh (@ready) { |
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if($fh == $lsn) { |
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my $new = $lsn->accept; # Create a new socket |
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$CON{$new} = new WAIT::Server::Connection $new, $VERSION; |
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$SEL->add($new); |
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} else { |
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my ($cmd, $func, @args, @cmd); |
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my $fno = fileno($fh); |
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|
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$cmd = $fh->getline(); |
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if ($cmd =~ /^post/i) { |
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/`/; |
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my $buf = |
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$cmd . |
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join('', @{${*$fh}{'net_cmd_lines'}}) . |
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${*$fh}{'net_cmd_partial'}; |
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($cmd) = ($buf =~ /^Command: (.*)$/m); |
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($cmd, @cmd) = (split (/:/, $cmd), 'quit'); |
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${*$fh}{'net_cmd_partial'} = ''; |
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/`/; |
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$CON{$fh}->{http} = 1; |
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} |
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COMMAND: |
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for $cmd ($cmd, @cmd) { |
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($func, @args) = split ' ', $cmd; |
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unless (fileno($fh)) { |
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printf STDERR "Shuttig down $fh(%d)\n", $fno; |
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delete $CON{$fh}; |
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$SEL->remove($fno); |
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next REQUEST; |
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} |
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$func = lc($func); |
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$func = $CON{$fh}->dispatch($func, @args); |
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if ($func eq 'quit') { |
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printf STDERR "closed\n"; |
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$SEL->remove($fh); |
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$CON{$fh}->close; |
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delete $CON{$fh}; |
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last COMMAND; |
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} |
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} |
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} |
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} |
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} |
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} |
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|
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package WAIT::Handle; |
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use Net::Cmd; |
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use IO::Socket; |
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use vars qw(@ISA); |
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use strict; |
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|
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@ISA = qw(Net::Cmd IO::Socket::INET); |
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|
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# Snarfed from Net::Cmd; we don't expect an answer. |
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sub dataend |
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{ |
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my $cmd = shift; |
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|
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return 1 |
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unless(exists ${*$cmd}{'net_cmd_lastch'}); |
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|
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if(${*$cmd}{'net_cmd_lastch'} eq "\015") |
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{ |
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syswrite($cmd,"\012",1); |
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print STDERR "\n" |
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if($cmd->debug); |
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} |
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elsif(${*$cmd}{'net_cmd_lastch'} ne "\012") |
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{ |
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syswrite($cmd,"\015\012",2); |
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print STDERR "\n" |
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if($cmd->debug); |
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} |
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|
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print STDERR "$cmd>>> .\n" |
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if($cmd->debug); |
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|
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syswrite($cmd,".\015\012",3); |
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|
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delete ${*$cmd}{'net_cmd_lastch'}; |
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|
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} |
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|
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package WAIT::Server::Connection; |
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use strict; |
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use Sys::Hostname; |
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use Socket qw(AF_INET unpack_sockaddr_in); |
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use vars qw(%CMD %MSG %HELP); |
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|
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my $HOST = hostname; |
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{ |
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no strict; |
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local *stab = *WAIT::Server::Connection::; |
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my ($key,$val); |
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while (($key,$val) = each(%stab)) { |
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next unless $key =~ /^cmd_(.*)/; |
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local(*ENTRY) = $val; |
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if (defined &ENTRY) { |
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$CMD{$1} = \&ENTRY; |
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} |
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} |
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} |
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|
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|
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sub new { |
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my $type = shift; |
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my $fh = shift; |
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my $msg = shift; |
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my $self = {_fh => $fh}; |
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|
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my $hersockaddr = $fh->peername(); |
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my ($port, $iaddr) = unpack_sockaddr_in($hersockaddr); |
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my $peer = gethostbyaddr($iaddr, AF_INET); |
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$self->{peer} = $peer; |
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$self->{database} = 'DB'; |
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$self->{table} = 'cpan'; |
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$self->{hits} = 10; |
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print "Connection from $peer\n"; |
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bless $self, $type; |
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$self->msg(200, $msg); |
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$self; |
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} |
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|
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sub close { |
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my $self = shift; |
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|
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$self->{_fh}->close; |
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} |
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|
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|
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sub dispatch { |
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my $self = shift; |
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my $cmd = shift; |
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|
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print "$cmd @_\n"; |
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unless (exists $CMD{$cmd}) { |
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$self->msg(500); |
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} else { |
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&{$CMD{$cmd}}($self, @_); |
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} |
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$cmd; |
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} |
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|
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sub msg { |
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my $self = shift; |
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my $code = shift; |
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my $msg = $MSG{$code} || ''; |
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printf("%s %s %03d $msg\r\n", scalar(localtime(time)), $self->{peer}, $code, @_); |
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$self->{_fh}->datasend(sprintf("%03d $msg\r\n", $code, @_)); |
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} |
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|
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sub end { |
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my $self = shift; |
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$self->{_fh}->dataend; |
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} |
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|
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|
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require WAIT::Query::Wais; |
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require WAIT::Database; |
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use Fcntl; |
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|
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my %DB; # cache Databas handles |
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sub DATABASE { |
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my $dn = shift; |
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|
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return $DB{$dn} if exists $DB{$dn}; |
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$DB{$dn} = WAIT::Database->open(name => $dn, |
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directory => $WAIT::Config->{'WAIT_home'}, |
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mode => O_RDONLY); |
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return $DB{$dn}; |
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} |
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|
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my %TB; # cache Table handles |
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sub TABLE { |
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my ($dbname, $tname) = @_; |
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|
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return $TB{$dbname.$tname} if exists $TB{$dbname.$tname}; |
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my $db = DATABASE($dbname); |
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|
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$TB{$dbname.$tname} = $db->table(name => $tname); |
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$TB{$dbname.$tname}; |
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} |
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|
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|
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# helpers |
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sub result { |
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my $self = shift; |
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my $hit = shift; |
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my $did; |
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|
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# http uses raw document id's |
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if ($self->{http}) { |
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return $hit; |
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} |
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unless ($self->{result}) { |
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$self->msg(404); |
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return; |
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} |
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unless ($did = $self->{result}->[$hit-1]) { |
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$self->msg(405); |
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return; |
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} |
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return $did; |
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} |
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|
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sub table { |
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my $self = shift; |
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|
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TABLE($self->{database}, $self->{table}); |
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} |
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|
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sub output { |
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my $self = shift; |
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|
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$self->{_fh}->datasend(@_); |
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} |
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|
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|
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# The commands |
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|
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sub cmd_help { |
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my $self = shift; |
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|
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$self->msg(100); |
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for (sort keys %CMD) { |
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$self->output(sprintf("%-15s %s\r\n", $_, $HELP{$_}||'')); |
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} |
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$self->end; |
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} |
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|
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sub cmd_quit { |
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my $self = shift; |
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$self->msg(205); |
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} |
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|
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sub cmd_database { |
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my $self = shift; |
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my $dbname = shift || $self->{database}; |
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|
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|
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if (DATABASE($dbname)) { |
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delete $self->{'result'}; |
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$self->{database} = $dbname; |
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$self->msg(201, $dbname); |
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} else { |
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$self->msg(401, $dbname); |
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} |
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} |
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|
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sub cmd_table { |
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my $self = shift; |
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my $table = shift || $self->{'table'}; |
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my $dbname = $self->{'database'}; |
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|
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if (TABLE($dbname, $table)) { |
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delete $self->{'result'}; |
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$self->{'table'} = $table; |
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$self->msg(202, $table); |
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} else { |
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$self->msg(402, $table); |
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} |
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} |
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|
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sub cmd_hits { |
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my $self = shift; |
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my $hits = shift; |
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|
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if ($hits) { |
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$self->{hits} = $hits; |
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$self->msg(204, $hits); |
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} else { |
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$self->msg(501); |
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} |
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} |
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|
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sub cmd_info { |
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my $self = shift; |
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my $hit = shift; |
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|
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my $did = $self->result($hit); |
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return unless $did; |
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|
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my $tb = $self->table; |
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|
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my %rec = $tb->fetch($did); |
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$self->msg(207, $did); |
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for (keys %rec) { |
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$self->{_fh}->datasend(sprintf("%-15s %s\n", $_, $rec{$_})); |
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} |
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$self->end; |
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} |
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|
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sub cmd_get { |
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my $self = shift; |
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my $hit = shift; |
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my $did = $self->result($hit); |
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|
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return unless $did; |
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my $tb = $self->table; |
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my %rec = $tb->fetch($did); |
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my $key = $rec{docid}; |
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|
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$key = $tb->dir . '/' . $key if $key =~ m(^data/); |
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|
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my $text = $tb->fetch_extern($key); |
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|
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$self->msg(206, $did); |
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$self->output($text); |
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$self->output("\n") unless $text =~ /\n$/; |
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$self->end; |
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} |
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|
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sub cmd_search { |
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my $self = shift; |
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my $query = join ' ', @_; |
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my $tb = $self->table; |
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|
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my $wq = eval {WAIT::Query::Wais::query($tb, $query)}; |
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unless ($wq) { |
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$self->msg(403); |
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return; |
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} |
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my %hits = $wq->execute(); |
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my @did = sort {$hits{$b} <=> $hits{$a}}keys %hits; |
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|
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# sanity check. this is expensive and should be obsolete! |
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# @did = grep $tb->fetch($_), @did; |
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|
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$self->{'result'} = \@did; |
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my $all_hits = scalar @did; |
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my $send_hits = $all_hits; |
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|
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if ($send_hits > $self->{hits}) { |
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$send_hits = $self->{hits}; |
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} |
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$self->msg(203, $all_hits, $send_hits); |
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my $i; |
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|
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for ($i=1;$i<=$send_hits;$i++) { |
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my $did = $did[$i-1]; |
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my %rec = $tb->fetch($did); |
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$self->{_fh}->datasend(sprintf("%2d %5.3f %s\n", |
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$self->{http}?$did:$i, |
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$hits{$did}, |
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$rec{headline})); |
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} |
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$self->end(); |
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} |
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|
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# read status messages |
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my $line; |
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while (defined ($line = <DATA>)) { |
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chomp($line); |
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my ($cmd, $msg) = split ' ', $line, 2; |
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last unless $cmd; |
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$HELP{$cmd} = $msg; |
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} |
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while (defined ($line = <DATA>)) { |
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chomp($line); |
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next unless $line =~ /^\d/; |
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my ($code, $msg) = split ' ', $line, 2; |
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$MSG{$code} = $msg; |
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} |
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|
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|
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1; |
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|
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__DATA__ |
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help - display this help message |
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database name set database name |
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table name set table name |
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search query submitt query |
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get number fetch full text of hit with number |
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info number display info record of hit with number |
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format text|html|term |
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hits number set maximum hits displayed to number |
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quit |
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|
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100 help message follows |
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200 WAIT server %s ready |
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205 closing connection - goodbye! |
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201 database %s selected |
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401 could not open database %s |
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202 table %s selected |
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203 query returnes %d hits, %d hits follow |
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204 will return %d hits |
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207 record %d follows |
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206 text of record %d follows |
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402 could not open table %s |
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403 syntax error in query |
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404 use search first |
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405 no such hit |
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500 command not recognized |
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501 command syntax error |
| 448 |
502 access restriction or permission denied |
| 449 |
503 program fault - command not performed |
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1; |
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