1 /* $Id: filter_virt_db.cpp,v 1.12 2005-10-30 18:51:20 adam Exp $
2 Copyright (c) 2005, Index Data.
11 #include "package.hpp"
13 #include <boost/thread/mutex.hpp>
16 #include "filter_virt_db.hpp"
20 #include <yaz/otherinfo.h>
21 #include <yaz/diagbib1.h>
27 namespace yf = yp2::filter;
32 Virt_db_set(yp2::Session &id, std::string setname,
33 std::string vhost, bool named_result_sets);
37 yp2::Session m_backend_session;
38 std::string m_backend_setname;
40 bool m_named_result_sets;
42 struct Virt_db_session {
43 Virt_db_session(yp2::Session &id, bool use_vhost);
45 yp2::Session m_session;
47 std::map<std::string,Virt_db_set> m_sets;
50 Virt_db_map(std::string vhost);
57 void release_session(Package &package);
58 void init(Package &package, Z_APDU *apdu, bool &move_later);
59 void search(Package &package, Z_APDU *apdu, bool &move_later);
60 void present(Package &package, Z_APDU *apdu, bool &move_later);
62 boost::mutex m_sessions_mutex;
63 std::map<yp2::Session,Virt_db_session>m_sessions;
64 std::map<std::string, Virt_db_map>m_maps;
66 typedef std::map<yp2::Session,Virt_db_session>::iterator Ses_it;
67 typedef std::map<std::string,Virt_db_set>::iterator Sets_it;
72 yf::Virt_db_set::Virt_db_set(yp2::Session &id, std::string setname,
73 std::string vhost, bool named_result_sets)
74 : m_backend_session(id), m_backend_setname(setname), m_vhost(vhost),
75 m_named_result_sets(named_result_sets)
80 yf::Virt_db_set::Virt_db_set()
85 yf::Virt_db_set::~Virt_db_set()
89 yf::Virt_db_map::Virt_db_map(std::string vhost)
94 yf::Virt_db_map::Virt_db_map()
98 yf::Virt_db_session::Virt_db_session()
104 yf::Virt_db_session::Virt_db_session(yp2::Session &id,
106 m_session(id) , m_use_vhost(use_vhost)
111 yf::Virt_db::Virt_db() : m_p(new Virt_db::Rep)
115 yf::Virt_db::~Virt_db() {
118 void yf::Virt_db::Rep::release_session(Package &package)
120 boost::mutex::scoped_lock lock(m_sessions_mutex);
122 m_sessions.erase(package.session());
125 void yf::Virt_db::Rep::present(Package &package, Z_APDU *apdu, bool &move_later){
127 Z_PresentRequest *req = apdu->u.presentRequest;
128 std::string resultSetId = req->resultSetId;
131 boost::mutex::scoped_lock lock(m_sessions_mutex);
133 Ses_it it = m_sessions.find(package.session());
134 if (it == m_sessions.end())
136 package.response() = odr.create_close(
137 Z_Close_protocolError,
138 "no session for present request");
139 package.session().close();
142 if (it->second.m_use_vhost)
147 Sets_it sets_it = it->second.m_sets.find(resultSetId);
148 if (sets_it == it->second.m_sets.end())
150 Z_APDU *apdu = zget_APDU(odr, Z_APDU_presentResponse);
152 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
153 apdu->u.presentResponse->records = rec;
154 rec->which = Z_Records_NSD;
155 rec->u.nonSurrogateDiagnostic =
156 zget_DefaultDiagFormat(
158 YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST,
159 resultSetId.c_str());
160 package.response() = apdu;
164 id = new yp2::Session(sets_it->second.m_backend_session);
167 // sending present to backend
168 Package present_package(*id, package.origin());
169 present_package.copy_filter(package);
171 req->resultSetId = odr_strdup(odr, "default");
172 present_package.request() = yazpp_1::GDU(apdu);
174 present_package.move();
176 if (present_package.session().is_closed())
178 Z_APDU *apdu = zget_APDU(odr, Z_APDU_presentResponse);
180 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
181 apdu->u.presentResponse->records = rec;
182 rec->which = Z_Records_NSD;
183 rec->u.nonSurrogateDiagnostic =
184 zget_DefaultDiagFormat(
186 YAZ_BIB1_RESULT_SET_NO_LONGER_EXISTS_UNILATERALLY_DELETED_BY_,
187 resultSetId.c_str());
188 package.response() = apdu;
190 boost::mutex::scoped_lock lock(m_sessions_mutex);
191 Ses_it it = m_sessions.find(package.session());
192 if (it != m_sessions.end())
193 it->second.m_sets.erase(resultSetId);
197 package.response() = present_package.response();
202 void yf::Virt_db::Rep::search(Package &package, Z_APDU *apdu, bool &move_later)
204 Z_SearchRequest *req = apdu->u.searchRequest;
206 std::string database;
207 std::string resultSetId = req->resultSetName;
208 bool support_named_result_sets = false; // whether backend supports it
211 boost::mutex::scoped_lock lock(m_sessions_mutex);
213 Ses_it it = m_sessions.find(package.session());
214 if (it == m_sessions.end())
216 package.response() = odr.create_close(
217 Z_Close_protocolError,
218 "no session for search request");
219 package.session().close();
223 if (it->second.m_use_vhost)
228 if (req->num_databaseNames != 1)
229 { // exactly one database must be specified
230 Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
232 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
233 apdu->u.searchResponse->records = rec;
234 rec->which = Z_Records_NSD;
235 rec->u.nonSurrogateDiagnostic =
236 zget_DefaultDiagFormat(
237 odr, YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED, 0);
238 package.response() = apdu;
242 database = req->databaseNames[0];
243 std::map<std::string, Virt_db_map>::iterator map_it;
244 map_it = m_maps.find(database);
245 if (map_it == m_maps.end())
246 { // no map for database: return diagnostic
247 Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
249 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
250 apdu->u.searchResponse->records = rec;
251 rec->which = Z_Records_NSD;
252 rec->u.nonSurrogateDiagnostic =
253 zget_DefaultDiagFormat(
254 odr, YAZ_BIB1_DATABASE_DOES_NOT_EXIST, database.c_str());
255 package.response() = apdu;
259 if (*req->replaceIndicator == 0)
261 Sets_it sets_it = it->second.m_sets.find(req->resultSetName);
262 if (sets_it != it->second.m_sets.end())
264 Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
266 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
267 apdu->u.searchResponse->records = rec;
268 rec->which = Z_Records_NSD;
269 rec->u.nonSurrogateDiagnostic =
270 zget_DefaultDiagFormat(
272 YAZ_BIB1_RESULT_SET_EXISTS_AND_REPLACE_INDICATOR_OFF,
274 package.response() = apdu;
279 it->second.m_sets.erase(req->resultSetName);
280 vhost = map_it->second.m_vhost;
282 // we might look for an existing session with same vhost
284 const char *vhost_cstr = vhost.c_str();
286 { // sending init to backend
287 Package init_package(id, package.origin());
288 init_package.copy_filter(package);
290 Z_APDU *init_apdu = zget_APDU(odr, Z_APDU_initRequest);
292 yaz_oi_set_string_oidval(&init_apdu->u.initRequest->otherInfo, odr,
293 VAL_PROXY, 1, vhost_cstr);
295 init_package.request() = init_apdu;
297 init_package.move(); // sending init
299 if (init_package.session().is_closed())
301 Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
303 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
304 apdu->u.searchResponse->records = rec;
305 rec->which = Z_Records_NSD;
306 rec->u.nonSurrogateDiagnostic =
307 zget_DefaultDiagFormat(
308 odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
309 package.response() = apdu;
311 Z_GDU *gdu = init_package.response().get();
312 // we hope to get an init response
313 if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
316 if (ODR_MASK_GET(gdu->u.z3950->u.initResponse->options,
317 Z_Options_namedResultSets))
318 support_named_result_sets = true;
322 Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
324 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
325 apdu->u.searchResponse->records = rec;
326 rec->which = Z_Records_NSD;
327 rec->u.nonSurrogateDiagnostic =
328 zget_DefaultDiagFormat(
329 odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
330 package.response() = apdu;
335 // sending search to backend
336 Package search_package(id, package.origin());
338 search_package.copy_filter(package);
339 const char *sep = strchr(vhost_cstr, '/');
341 req->databaseNames[0] = odr_strdup(odr, sep+1);
343 *req->replaceIndicator = 1;
345 std::string backend_resultSetId = "default";
346 req->resultSetName = odr_strdup(odr, backend_resultSetId.c_str());
347 search_package.request() = yazpp_1::GDU(apdu);
349 search_package.move();
351 if (search_package.session().is_closed())
353 Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
355 Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
356 apdu->u.searchResponse->records = rec;
357 rec->which = Z_Records_NSD;
358 rec->u.nonSurrogateDiagnostic =
359 zget_DefaultDiagFormat(
360 odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
361 package.response() = apdu;
365 package.response() = search_package.response();
367 boost::mutex::scoped_lock lock(m_sessions_mutex);
368 Ses_it it = m_sessions.find(package.session());
369 if (it != m_sessions.end())
370 it->second.m_sets[resultSetId] =
371 Virt_db_set(id, backend_resultSetId, vhost,
372 support_named_result_sets);
375 void yf::Virt_db::Rep::init(Package &package, Z_APDU *apdu, bool &move_later)
377 release_session(package);
378 boost::mutex::scoped_lock lock(m_sessions_mutex);
380 Z_InitRequest *req = apdu->u.initRequest;
383 yaz_oi_get_string_oidval(&req->otherInfo, VAL_PROXY, 1, 0);
387 Z_APDU *apdu = zget_APDU(odr, Z_APDU_initResponse);
388 Z_InitResponse *resp = apdu->u.initResponse;
391 static const int masks[] = {
392 Z_Options_search, Z_Options_present, Z_Options_namedResultSets, -1
394 for (i = 0; masks[i] != -1; i++)
395 if (ODR_MASK_GET(req->options, masks[i]))
396 ODR_MASK_SET(resp->options, masks[i]);
398 static const int versions[] = {
404 for (i = 0; versions[i] != -1; i++)
405 if (ODR_MASK_GET(req->protocolVersion, versions[i]))
406 ODR_MASK_SET(resp->protocolVersion, versions[i]);
410 package.response() = apdu;
412 m_sessions[package.session()] = Virt_db_session(package.session(), false);
416 m_sessions[package.session()] = Virt_db_session(package.session(), true);
421 void yf::Virt_db::add_map_db2vhost(std::string db, std::string vhost)
423 m_p->m_maps[db] = Virt_db_map(vhost);
426 void yf::Virt_db::process(Package &package) const
428 Z_GDU *gdu = package.request().get();
430 if (!gdu || gdu->which != Z_GDU_Z3950)
434 bool move_later = false;
435 Z_APDU *apdu = gdu->u.z3950;
436 if (apdu->which == Z_APDU_initRequest)
438 m_p->init(package, apdu, move_later);
440 else if (apdu->which == Z_APDU_searchRequest)
442 m_p->search(package, apdu, move_later);
444 else if (apdu->which == Z_APDU_presentRequest)
446 m_p->present(package, apdu, move_later);
452 package.response() = odr.create_close(
453 Z_Close_protocolError,
454 "unsupported APDU in filter_virt_db");
456 package.session().close();
461 if (package.session().is_closed())
462 m_p->release_session(package);
469 * indent-tabs-mode: nil
470 * c-file-style: "stroustrup"
472 * vim: shiftwidth=4 tabstop=8 expandtab