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root/cvsroot/COMP/SCRAM/src/URL/URLhandler.pm

Comparing COMP/SCRAM/src/URL/URLhandler.pm (file contents):
Revision 1.2 by williamc, Mon Aug 23 15:54:10 1999 UTC vs.
Revision 1.15.2.1 by williamc, Fri Aug 4 08:21:26 2000 UTC

#	Line 1 | Line 1
1	–	# url handler -> returns the location of the file
2	–	#
1		# Interface
2		# ---------
3	<	# new() :
4	<	# new(cachedir)       : A new urlhandler with a defined default cahce directory
5	<	# get(url)            : download from the specified url to the default cache
6	<	# get(url,location)   : download to the specified directory
7	<	# setbase(type,@args) : set the url defaults for a specific url type
8	<	#                       arguments are dependent on type
11	<	#                       http:
12	<	#                       file:
13	<	#                       cvs: servername,servertype [ ,user,passkey ]
14	<	#                       label:
3	>	# new(cache)       : A new urlhandler with a defined default cahce directory
4	>	# download(url,[location]) : as get but always download
5	>	# get(url,[location]) : download from the specified url to cache or location
6	>	#                       return the full url path name incl. any base expansion
7	>	#                       and the filename downloaded to
8	>	# setbase(urlstring) : set a base url type
9		# unsetbase(type)  : deactivate a previously set base
10	+	# currentbase(type) : return the current base for the given type
11		#
12		# ----------------------------------------------------------------------
18	–	# returns file location - or crashes out
19	–	# can pass a file name for the item to be stored as
20	–	# if not then stores in a default cache.
13
14	<	package URLhandler;
14	>	package URL::URLhandler;
15		require 5.004;
16		use Utilities::AddDir;
17	+	use URL::URLcache;
18	+	use URL::URLclass;
19		use Carp;
20
21		sub new {
#	Line 37 | Line 31 | sub init {
31		use Utilities::AddDir;
32		my $self=shift;
33		my $cache=shift;
40	–	if (! defined $cache  ) { $cache="/tmp/SCRAMcache" }; # default cache
41	–	AddDir::adddir($cache);
34		$self->{cache}=$cache;
35	+	$self->{cachestore}=$self->{cache}->filestore();
36		use URL::URL_cvs;
37		use URL::URL_file;
38	+	use URL::URL_test;
39		$self->{urlmodules}={
40	<	'cvs' => 'URL_cvs',
41	<	'file' => 'URL_file'
40	>	'cvs' => 'URL::URL_cvs',
41	>	'file' => 'URL::URL_file',
42	>	'test' => 'URL::URL_test'
43		};
49	–	$self->{filebase}="";
50	–	$self->setbase("file", {}); # Base file as default
44		}
45
46	<	sub get ($@) {
46	>	sub get {
47		my $self=shift;
48		my $origurl=shift;
49	<	my $filename=shift;
50	<	my $rest;
51	<	my $type;
52	<	my $url;
53	<	my $version;
54	<
55	<	if ( ! defined $filename ) {
56	<	$filename=$self->{cache};
57	<	}
58	<	chomp $origurl;
66	<	# get our version info from the url (after last ??)
67	<	( $url, $version) = split /\?\?/, $origurl;
68	<	if ( $url=~/:/ ) {
69	<	($type,$rest) = split /:/, $url;
70	<	}
71	<	else {
72	<	$type='label';
73	<	$rest=$url.":".$version;
74	<	}
75	<	if ( ! ( exists $self->{'urlmodules'}{$type}) ) {
76	<	print "URLhandler: Unsupported type $type\n";
77	<	carp;
78	<	}
79	<	else {
80	<	eval{${$self->{urlostack}{$type}}[$#{$self->{urlostack}{$type}}]}->
81	<	get($rest, $filename);
49	>	my $file="";
50	>
51	>	my $url=URL::URLclass->new($origurl);
52	>	my $type=$url->type();
53	>	$url->merge($self->currentbase($type));
54	>	my $fullurl=$url->url();
55	>
56	>	$file=$self->{cache}->file($fullurl);
57	>	if ( $file eq "" ) {
58	>	($fullurl,$file)=$self->download($origurl, @_);
59		}
60	+	return ($fullurl, $file);
61		}
62
63	<	sub setbase {
63	>	sub download {
64		my $self=shift;
65	<	my $type=shift;
88	<	my @args=@_;
89	<	my $oref;
65	>	my $origurl=shift;
66
67	<	# Check type is supported
68	<	if ( ! exists $self->{urlmodules}{$type} ) {
69	<	print "URLhandler error: Unsupported type $type\n";
70	<	return 1;
67	>	# Process the URL string
68	>	my $url=URL::URLclass->new($origurl);
69	>	my $type=$url->type();
70	>	$urltypehandler=$self->_typehandler($type);
71	>	$url->merge($self->currentbase($type));
72	>
73	>	# Generate a location name if not provided
74	>	$nocache=1;
75	>	if ( @_ ) {
76	>	$location=shift;
77	>	$nocache=0; # dont cache if downloaded to an external location
78		}
79		else {
80	<	# A new URL object - pushed onto the stack
98	<	$oref=eval{$self->{urlmodules}{$type}}->new();
99	<	push @{$self->{urlostack}{$type}}, $oref;
100	<	$oref->setbase(@args);
80	>	$location=$self->{cache}->filename($url->url());
81		}
82	+	# -- get the file from the appropriate handler
83	+	if ( defined $urltypehandler ) {
84	+	# Call the download module
85	+	$file=eval{$urltypehandler->get($url, $location)};
86	+	}
87	+
88	+	# now register it in the cache if successful
89	+	if ( $file && $nocache) {
90	+	$self->{cache}->store($url->url(), $location);
91	+	}
92	+	return ($url->url(), $file);
93	+	}
94	+
95	+	sub setbase {
96	+	my $self=shift;
97	+	my $partialurl=shift;
98	+
99	+	my $base=URL::URLclass->new($partialurl);
100	+	my $type=$base->type();
101	+	$self->checktype($type);
102	+	# make a new base-url object
103	+	push @{$self->{"basestack"}{$type}}, $base;
104		}
105
106		sub unsetbase {
#	Line 106 | Line 108 | sub unsetbase {
108		my $type=shift;
109		my $oref;
110
111	<	# Check type is supported
111	>	$self->checktype($type);
112	>	# pop off the stack and call the unset base method
113	>	if ( $#{$self->{basestack}{$type}} >=0 ) {
114	>	my $base=pop @{$self->{basestack}{$type}};
115	>	undef $base;
116	>	}
117	>	else {
118	>	die "URLhandler error: Unable to unset type $type\n";
119	>	}
120	>	# remove the stack if its empty
121	>	if ( $#{$self->{basestack}{$type}} == -1 ) {
122	>	delete $self->{basestack}{$type};
123	>	}
124	>	}
125	>
126	>	sub currentbase {
127	>	my $self=shift;
128	>	my $type=shift;
129	>	my $rv;
130	>
131	>	if ( exists $self->{basestack}{$type} ) {
132	>	$rv=${$self->{basestack}{$type}}[$#{$self->{basestack}{$type}}];
133	>	}
134	>	else {
135	>	$rv=undef;
136	>	}
137	>	return $rv;
138	>	}
139	>
140	>	sub checktype($type) {
141	>	my $self=shift;
142	>	my $type=shift;
143	>
144	>	# Check type is supported
145		if ( ! exists $self->{urlmodules}{$type} ) {
146	<	print "URLhandler error: Unsupported type $type\n";
112	<	return 1;
113	<	}
114	<	else {
115	<	# pop off the stack and call the unset base method
116	<	if ( $#{$self->{urlostack}{$type}} >=0 ) {
117	<	$oref=pop @{$self->{urlostack}{$type}};
118	<	$oref->unsetbase();
119	<	undef $oref;
120	<	}
121	<	else {
122	<	print "URLhandler error: Unable to unset type $type\n";
123	<	return 1;
124	<	}
146	>	die "URLhandler error: Unsupported type $type\n";
147		}
148		}
149
150	<	# ------------------------ General Support Routines ----------------------------
150	>	sub _typehandler {
151	>	my $self=shift;
152	>	my $type=shift;
153
154	<	sub cachefilename {
131	<	my $self=shift;
132	<	use File::Basename;
133	<	use Utilities::AddDir;
134	<	my $filebase=dirname($rest);
135	<	$cache="/tmp/williamc/urlhandler$$";
136	<	adddir($cache);
137	<	$filename=$cache."/".$filebase;
138	<	}
154	>	$self->checktype($type);
155
156	+	# instantiate only if it dosnt already exist;
157	+	if ( exists $self->{'urlobjs'}{$type} ) {
158	+	$self->{'urlobjs'}{$type};
159	+	}
160	+	else {
161	+	$self->{'urlobjs'}{$type}=$self->{urlmodules}{$type}->new();
162	+	}
163	+	}

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