3 # Copyright (C) 2009-2010 Dan Scott <dscott@laurentian.ca>
5 # This program is free software; you can redistribute it and/or
6 # modify it under the terms of the GNU General Public License
7 # as published by the Free Software Foundation; either version 2
8 # of the License, or (at your option) any later version.
10 # This program is distributed in the hope that it will be useful,
11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 # GNU General Public License for more details.
15 # You should have received a copy of the GNU General Public License
16 # along with this program; if not, write to the Free Software
17 # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 OpenILS::Application::ResolverResolver - retrieves holdings from OpenURL resolvers
26 request open-ils.resolver open-ils.resolver.resolve_holdings "issn", "0022-362X"
28 request open-ils.resolver open-ils.resolver.resolve_holdings.raw "issn", "0022-362X"
31 my $session = OpenSRF::AppSession->create("open-ils.resolver");
32 my $request = $session->request("open-ils.resolver.resolve_holdings", [ "issn", "0022-362X" ] )->gather();
33 $session->disconnect();
35 # $request is a reference to the list of hashes
39 OpenILS::Application::ResolverResolver caches responses from OpenURL resolvers
40 to requests for full-text holdings. Currently integration with SFX is supported.
42 Each org_unit can specify a different base URL as the third argument to
43 resolve_holdings(). Eventually org_units will have org_unit settings to hold
44 their resolver type and base URL.
48 Dan Scott, dscott@laurentian.ca
52 package OpenILS::Application::ResolverResolver;
59 # All OpenSRF applications must be based on OpenSRF::Application or
60 # a subclass thereof. Makes sense, eh?
61 use OpenILS::Application;
62 use base qw/OpenILS::Application/;
64 # This is the client class, used for connecting to open-ils.storage
65 use OpenSRF::AppSession;
67 # This is an extension of Error.pm that supplies some error types to throw
68 use OpenSRF::EX qw(:try);
70 # This is a helper class for querying the OpenSRF Settings application ...
71 use OpenSRF::Utils::SettingsClient;
73 # ... and here we have the built in logging helper ...
74 use OpenSRF::Utils::Logger qw($logger);
76 # ... and this manages cached results for us ...
77 use OpenSRF::Utils::Cache;
79 # ... and this gives us access to the Fieldmapper
80 use OpenILS::Utils::Fieldmapper;
82 my $prefix = "open-ils.resolver_"; # Prefix for caching values
85 my $default_url_base; # Default resolver location
86 my $resolver_type; # Default resolver type
92 $cache = OpenSRF::Utils::Cache->new('global');
93 my $sclient = OpenSRF::Utils::SettingsClient->new();
94 $cache_timeout = $sclient->config_value(
95 "apps", "open-ils.resolver", "app_settings", "cache_timeout" ) || 300;
96 $default_url_base = $sclient->config_value(
97 "apps", "open-ils.resolver", "app_settings", "default_url_base");
98 $resolver_type = $sclient->config_value(
99 "apps", "open-ils.resolver", "app_settings", "resolver_type");
103 # We need a User Agent to speak to the SFX beast
104 $ua = new LWP::UserAgent;
105 $ua->agent('SameOrigin/1.0');
107 # SFX returns XML to us; let us parse
108 $parser = new XML::LibXML;
111 sub resolve_holdings {
114 my $id_type = shift; # keep it simple for now, either 'issn' or 'isbn'
115 my $id_value = shift; # the normalized ISSN or ISBN
116 my $url_base = shift || $default_url_base;
118 if ($resolver_type eq 'cufts') {
119 return cufts_holdings($self,$conn,$id_type,$id_value,$url_base);
121 return sfx_holdings($self,$conn,$id_type,$id_value,$url_base);
130 my $id_value = $_[3];
131 my $url_base = $_[4];
133 # We'll use this in our cache key
134 my $method = $self->api_name;
136 # We might want to return raw JSON for speedier responses
137 my $format = 'fieldmapper';
138 if ($self->api_name =~ /raw$/) {
142 # Nice little CUFTS OpenURL request
145 if ($id_type eq 'issn') {
146 $url_args .= "&issn=$id_value";
147 } elsif ($id_type eq 'isbn') {
148 $url_args .= "&isbn=$id_value";
151 my $ckey = $prefix . $method . $url_base . $id_type . $id_value;
153 # Check the cache to see if we've already looked this up
154 # If we have, shortcut our return value
155 my $result = $cache->get_cache($ckey) || undef;
157 $logger->info("Resolver found a cache hit");
161 # Otherwise, let's go and grab the info from the CUFTS server
162 my $req = HTTP::Request->new('GET', "$url_base$url_args");
164 # Let's see what we we're trying to request
165 $logger->info("Resolving the following request: $url_base$url_args");
167 my $res = $ua->request($req);
169 my $xml = $res->content;
170 my $parsed_cufts = $parser->parse_string($xml);
172 my (@targets) = $parsed_cufts->findnodes('/CUFTS/resource/service[@name="journal"]');
175 foreach my $target (@targets) {
178 # Ensure we have a name and especially URL to return
179 $full_txt{'name'} = $target->findvalue('../@name[1]');
180 $full_txt{'url'} = $target->findvalue('./result/url') || next;
181 $full_txt{'coverage'} = $target->findvalue('./result/ft_start_date') . ' - ' . $target->findvalue('./result/ft_end_date');
183 my $days_embargo = $target->findvalue('./result/embargo_days') || '';
184 if (length($days_embargo) > 0) {
185 $days_embargo = $days_embargo . " days ";
187 my $months_embargo = $target->findvalue('./result/embargo_months') || '';
188 if (length($months_embargo) > 0) {
189 $months_embargo = $months_embargo . " months ";
191 my $years_embargo = $target->findvalue('./result/embargo_years') || '';
192 if (length($years_embargo) > 0) {
193 $years_embargo = $years_embargo . " years ";
195 if (length($years_embargo . $months_embargo . $days_embargo) > 0) {
196 $embargo = "(most recent " . $years_embargo . $months_embargo . $days_embargo . "unavailable due to publisher restrictions)";
198 $full_txt{'embargo'} = $embargo;
200 if ($format eq 'raw') {
201 push @cufts_result, {
202 public_name => $full_txt{'name'},
203 target_url => $full_txt{'url'},
204 target_coverage => $full_txt{'coverage'},
205 target_embargo => $full_txt{'embargo'},
208 my $rhr = Fieldmapper::resolver::holdings_record->new;
209 $rhr->public_name($full_txt{'name'});
210 $rhr->target_url($full_txt{'url'});
211 $rhr->target_coverage($full_txt{'coverage'});
212 $rhr->target_embargo($full_txt{'embargo'});
213 push @cufts_result, $rhr;
217 # Stuff this into the cache
218 $cache->put_cache($ckey, \@cufts_result, $cache_timeout);
220 # Don't return the list unless it contains results
221 if (scalar(@cufts_result)) {
222 return \@cufts_result;
233 my $id_value = $_[3];
234 my $url_base = $_[4];
236 # We'll use this in our cache key
237 my $method = $self->api_name;
239 # We might want to return raw JSON for speedier responses
240 my $format = 'fieldmapper';
241 if ($self->api_name =~ /raw$/) {
245 # Big ugly SFX OpenURL request
246 my $url_args = '?url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&'
247 . 'ctx_enc=UTF-8&ctx_ver=Z39.88-2004&rfr_id=info:sid/evergreen&'
248 . 'sfx.ignore_date_threshold=1&'
249 . 'sfx.response_type=multi_obj_detailed_xml&__service_type=getFullTxt';
251 if ($id_type eq 'issn') {
252 $url_args .= "&rft.issn=$id_value";
253 } elsif ($id_type eq 'isbn') {
254 $url_args .= "&rft.isbn=$id_value";
257 my $ckey = $prefix . $method . $url_base . $id_type . $id_value;
259 # Check the cache to see if we've already looked this up
260 # If we have, shortcut our return value
261 my $result = $cache->get_cache($ckey) || undef;
263 $logger->info("Resolver found a cache hit");
267 # Otherwise, let's go and grab the info from the SFX server
268 my $req = HTTP::Request->new('GET', "$url_base$url_args");
270 # Let's see what we we're trying to request
271 $logger->info("Resolving the following request: $url_base$url_args");
273 my $res = $ua->request($req);
275 my $xml = $res->content;
276 my $parsed_sfx = $parser->parse_string($xml);
278 my (@targets) = $parsed_sfx->findnodes('//target');
281 foreach my $target (@targets) {
284 # Ensure we have a name and especially URL to return
285 $full_txt{'name'} = $target->findvalue('./target_public_name') || next;
286 $full_txt{'url'} = $target->findvalue('.//target_url') || next;
287 $full_txt{'coverage'} = $target->findvalue('.//coverage_statement') || '';
288 $full_txt{'embargo'} = $target->findvalue('.//embargo_statement') || '';
290 if ($format eq 'raw') {
292 public_name => $full_txt{'name'},
293 target_url => $full_txt{'url'},
294 target_coverage => $full_txt{'coverage'},
295 target_embargo => $full_txt{'embargo'},
298 my $rhr = Fieldmapper::resolver::holdings_record->new;
299 $rhr->public_name($full_txt{'name'});
300 $rhr->target_url($full_txt{'url'});
301 $rhr->target_coverage($full_txt{'coverage'});
302 $rhr->target_embargo($full_txt{'embargo'});
303 push @sfx_result, $rhr;
307 # Stuff this into the cache
308 $cache->put_cache($ckey, \@sfx_result, $cache_timeout);
310 # Don't return the list unless it contains results
311 if (scalar(@sfx_result)) {
318 __PACKAGE__->register_method(
319 method => 'resolve_holdings',
320 api_name => 'open-ils.resolver.resolve_holdings',
325 Returns a list of "rhr" objects representing the full-text holdings for a given ISBN or ISSN
329 desc => 'The type of identifier ("issn" or "isbn")',
333 desc => 'The identifier value',
337 desc => 'The base URL for the resolver and instance',
342 desc => 'Returns a list of "rhr" objects representing the full-text holdings for a given ISBN or ISSN',
348 __PACKAGE__->register_method(
349 method => 'resolve_holdings',
350 api_name => 'open-ils.resolver.resolve_holdings.raw',
355 Returns a list of raw JSON objects representing the full-text holdings for a given ISBN or ISSN
359 desc => 'The type of identifier ("issn" or "isbn")',
363 desc => 'The identifier value',
367 desc => 'The base URL for the resolver and instance',
372 desc => 'Returns a list of raw JSON objects representing the full-text holdings for a given ISBN or ISSN',
378 # Clear cache for specific lookups
379 sub delete_cached_holdings {
382 my $id_type = shift; # keep it simple for now, either 'issn' or 'isbn'
383 my $id_value = shift; # the normalized ISSN or ISBN
384 my $url_base = shift || $default_url_base;
387 $logger->warn("Deleting value [$id_value]");
388 # We'll use this in our cache key
389 foreach my $method ('open-ils.resolver.resolve_holdings.raw', 'open-ils.resolver.resolve_holdings') {
390 my $ckey = $prefix . $method . $url_base . $id_type . $id_value;
392 $logger->warn("Deleted cache key [$ckey]");
393 my $result = $cache->delete_cache($ckey);
395 $logger->warn("Result of deleting cache key: [$result]");
396 push @deleted_keys, $result;
399 return \@deleted_keys;
402 __PACKAGE__->register_method(
403 method => 'delete_cached_holdings',
404 api_name => 'open-ils.resolver.delete_cached_holdings',
409 Deletes the cached value of the full-text holdings for a given ISBN or ISSN
413 desc => 'The type of identifier ("issn" or "isbn")',
417 desc => 'The identifier value',
421 desc => 'The base URL for the resolver and instance',
426 desc => 'Deletes the cached value of the full-text holdings for a given ISBN or ISSN',