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# -*- Mode: Cperl -*- |
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# Client.pm -- |
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# ITIID : $ITI$ $Header $__Header$ |
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# Author : Ulrich Pfeifer |
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# Created On : Fri Jan 31 10:49:37 1997 |
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# Last Modified By: Ulrich Pfeifer |
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# Last Modified On: Tue Feb 11 15:32:14 1997 |
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# Language : CPerl |
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# Update Count : 85 |
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# Status : Unknown, Use with caution! |
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# |
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# (C) Copyright 1997, Universität Dortmund, all rights reserved. |
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# |
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|
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package WAIT::Client; |
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use Net::NNTP (); |
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use Net::Cmd qw(CMD_OK); |
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use Carp; |
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use strict; |
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use vars qw(@ISA); |
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|
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@ISA = qw(Net::NNTP); |
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|
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sub search |
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{ |
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my $wait = shift; |
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|
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$wait->_SEARCH(@_) |
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? $wait->read_until_dot() |
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: undef; |
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} |
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|
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sub info |
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{ |
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@_ == 2 or croak 'usage: $wait->info( HIT-NUMBER )'; |
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my $wait = shift; |
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|
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$wait->_INFO(@_) |
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? $wait->read_until_dot() |
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: undef; |
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} |
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|
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sub get |
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{ |
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@_ == 2 or croak 'usage: $wait->info( HIT-NUMBER )'; |
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my $wait = shift; |
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|
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$wait->_GET(@_) |
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? $wait->read_until_dot() |
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: undef; |
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} |
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|
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sub database |
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{ |
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@_ == 2 or croak 'usage: $wait->database( DBNAME )'; |
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my $wait = shift; |
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|
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$wait->_DATABASE(@_); |
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} |
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|
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sub table |
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{ |
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@_ == 2 or croak 'usage: $wait->table( TABLE )'; |
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my $wait = shift; |
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|
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$wait->_TABLE(@_); |
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} |
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|
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sub hits |
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{ |
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@_ == 2 or croak 'usage: $wait->hits( NUM-MAX-HITS )'; |
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my $wait = shift; |
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|
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$wait->_HITS(@_); |
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} |
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|
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sub _SEARCH { shift->command('SEARCH', @_)->response == CMD_OK } |
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sub _INFO { shift->command('INFO', @_)->response == CMD_OK } |
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sub _GET { shift->command('GET', @_)->response == CMD_OK } |
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sub _DATABASE { shift->command('DATABASE', @_)->response == CMD_OK } |
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sub _TABLE { shift->command('TABLE', @_)->response == CMD_OK } |
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sub _HITS { shift->command('HITS', @_)->response == CMD_OK } |
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|
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# The following is a real hack. Don't look at it ;-) It tries to |
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# emulate a stateful protocol over HTTP which is weird and slow. |
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package WAIT::Client::HTTP; |
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use Net::Cmd; |
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use vars qw(@ISA); |
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use Carp; |
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|
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@ISA = qw(WAIT::Client); |
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|
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sub new { |
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my $type = shift; |
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my $host = shift; |
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my %parm = @_; |
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my ($proxy, $port) = ($parm{Proxy} =~ m{^(?:http://)(\S+)(?::(\d+))}); |
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$port = 80 unless $port; |
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|
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my $self = { |
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proxy_host => $proxy, |
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proxy_port => $port, |
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wais_host => $host, |
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wais_port => $parm{Port}, |
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}; |
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bless $self, $type; |
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|
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if ($self->command('HELP')->response == CMD_INFO) { |
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return $self; |
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} else { |
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return; |
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} |
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} |
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|
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sub command { |
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my $self = shift; |
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my $con = |
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WAIT::Client::HTTP::Handle->new |
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( |
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PeerAddr => $self->{proxy_host}, |
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PeerPort => $self->{proxy_port}, |
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Proto => 'tcp', |
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); |
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return unless $con; |
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my $cmd = join ' ', @_; |
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|
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if ($self->{hits}) { |
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$cmd = "HITS $self->{hits}:$cmd"; |
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} |
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$cmd = "Command: $cmd"; |
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$con->autoflush(1); |
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|
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$con->printf("POST http://$self->{wais_host}:$self->{wais_port} ". |
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"HTTP/1.0\nContent-Length: %d\n\n$cmd", |
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length($cmd)); |
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|
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unless ($con->response == CMD_OK) { |
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warn "No greeting from server\n"; |
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} |
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if ($self->{hits}) { |
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unless ($con->response == CMD_OK) { |
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warn "Hits not aknowledged\n"; |
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} |
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} |
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$self->{con} = $con; |
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$con; |
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} |
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|
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# We map here raw document id's to rank numbers and back for |
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# convenience. Besides that the following search(), info(), and get() |
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# are obsolete. |
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|
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sub search |
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{ |
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my $wait = shift; |
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|
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if ($wait->_SEARCH(@_)) { |
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my $r = $wait->read_until_dot(); |
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my $i = 1; |
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|
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delete $wait->{'map'}; |
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for (@$r) { |
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if (s/^(\d+)/sprintf("%4d",$i)/e) { |
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$wait->{'map'}->[$i++] = $1; |
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} |
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} |
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return $r; |
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} |
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return undef; |
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} |
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|
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sub info |
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{ |
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@_ == 2 or croak 'usage: $wait->info( HIT-NUMBER )'; |
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my $wait = shift; |
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my $num = shift; |
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|
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unless ($wait->{'map'}->[$num]) { |
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print "No such hit: $num\n"; |
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return; |
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} |
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$wait->_INFO($wait->{'map'}->[$num]) |
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? $wait->read_until_dot() |
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: undef; |
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} |
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|
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sub get |
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{ |
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@_ == 2 or croak 'usage: $wait->info( HIT-NUMBER )'; |
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my $wait = shift; |
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my $num = shift; |
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|
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unless ($wait->{'map'}->[$num]) { |
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print "No such hit: $num\n"; |
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return; |
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} |
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$wait->_GET($wait->{'map'}->[$num]) |
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? $wait->read_until_dot() |
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: undef; |
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} |
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|
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# We must store the hit count locally |
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sub _HITS { |
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my $self = shift; |
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my $hits = shift; |
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|
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$self->{hits} = $hits; |
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["Setting maximum hit count to $hits"]; |
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} |
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|
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# We should use AUTOLOAD here. I know ;-) |
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sub read_until_dot {shift->{con}->read_until_dot(@_)} |
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sub message {shift->{con}->message(@_)} |
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|
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package WAIT::Client::HTTP::Handle; |
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use vars qw(@ISA); |
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|
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@ISA = qw(Net::Cmd IO::Socket::INET); |
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|
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|
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1; |
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