-/* $Id: filter_virt_db.cpp,v 1.15 2005-12-19 08:42:59 adam Exp $
+/* $Id: filter_virt_db.cpp,v 1.16 2006-01-04 11:19:04 adam Exp $
Copyright (c) 2005, Index Data.
%LICENSE%
#include "package.hpp"
#include <boost/thread/mutex.hpp>
+#include <boost/thread/condition.hpp>
#include "util.hpp"
#include "filter_virt_db.hpp"
Virt_db_map();
std::string m_vhost;
};
+ struct Frontend {
+ Frontend();
+ ~Frontend();
+ yp2::Session m_session;
+ bool m_use_vhost;
+ bool m_in_use;
+ std::map<std::string,Virt_db_set> m_sets;
+ void search(Package &package, Z_APDU *apdu,
+ const std::map<std::string, Virt_db_map> &maps);
+ void present(Package &package, Z_APDU *apdu);
+ void close(Package &package);
+ typedef std::map<std::string,Virt_db_set>::iterator Sets_it;
+ };
class Virt_db::Rep {
friend class Virt_db;
void init(Package &package, Z_APDU *apdu, bool &move_later);
void search(Package &package, Z_APDU *apdu, bool &move_later);
void present(Package &package, Z_APDU *apdu, bool &move_later);
+
+ Frontend *get_frontend(Package &package);
+ void release_frontend(Package &package);
private:
boost::mutex m_sessions_mutex;
std::map<yp2::Session,Virt_db_session>m_sessions;
typedef std::map<yp2::Session,Virt_db_session>::iterator Ses_it;
typedef std::map<std::string,Virt_db_set>::iterator Sets_it;
+
+ boost::mutex m_mutex;
+ boost::condition m_cond_session_ready;
+ std::map<yp2::Session,Frontend *> m_clients;
};
}
}
using namespace yp2;
+yf::Frontend::Frontend()
+{
+ m_use_vhost = false;
+}
+
+void yf::Frontend::close(Package &package)
+{
+ Sets_it sit = m_sets.begin();
+ for (; sit != m_sets.end(); sit++)
+ {
+ sit->second.m_backend_session.close();
+ Package close_package(sit->second.m_backend_session, package.origin());
+ close_package.copy_filter(package);
+
+ close_package.move();
+ }
+}
+
+yf::Frontend::~Frontend()
+{
+}
+
+yf::Frontend *yf::Virt_db::Rep::get_frontend(Package &package)
+{
+ boost::mutex::scoped_lock lock(m_mutex);
+
+ std::map<yp2::Session,yf::Frontend *>::iterator it;
+
+ while(true)
+ {
+ it = m_clients.find(package.session());
+ if (it == m_clients.end())
+ break;
+
+ if (!it->second->m_in_use)
+ {
+ it->second->m_in_use = true;
+ return it->second;
+ }
+ m_cond_session_ready.wait(lock);
+ }
+ Frontend *f = new Frontend;
+ m_clients[package.session()] = f;
+ f->m_in_use = true;
+ return f;
+}
+
+
+void yf::Virt_db::Rep::release_frontend(Package &package)
+{
+ boost::mutex::scoped_lock lock(m_mutex);
+ std::map<yp2::Session,yf::Frontend *>::iterator it;
+
+ it = m_clients.find(package.session());
+ if (it != m_clients.end())
+ {
+ if (package.session().is_closed())
+ {
+ std::cout << "Closing IT\n";
+ it->second->close(package);
+ delete it->second;
+ m_clients.erase(it);
+ }
+ else
+ {
+ it->second->m_in_use = false;
+ }
+ m_cond_session_ready.notify_all();
+ }
+}
+
yf::Virt_db_set::Virt_db_set(yp2::Session &id, std::string setname,
std::string vhost, bool named_result_sets)
: m_backend_session(id), m_backend_setname(setname), m_vhost(vhost),
delete id;
}
+void yf::Frontend::present(Package &package, Z_APDU *apdu)
+{
+ Session *id = 0;
+ Z_PresentRequest *req = apdu->u.presentRequest;
+ std::string resultSetId = req->resultSetId;
+ yp2::odr odr;
+
+ Sets_it sets_it = m_sets.find(resultSetId);
+ if (sets_it == m_sets.end())
+ {
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_presentResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.presentResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr,
+ YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST,
+ resultSetId.c_str());
+ package.response() = apdu;
+
+ return;
+ }
+ id = new yp2::Session(sets_it->second.m_backend_session);
+
+ // sending present to backend
+ Package present_package(*id, package.origin());
+ present_package.copy_filter(package);
+
+ req->resultSetId = odr_strdup(odr, "default");
+ present_package.request() = yazpp_1::GDU(apdu);
+
+ present_package.move();
+
+ if (present_package.session().is_closed())
+ {
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_presentResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.presentResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr,
+ YAZ_BIB1_RESULT_SET_NO_LONGER_EXISTS_UNILATERALLY_DELETED_BY_,
+ resultSetId.c_str());
+ package.response() = apdu;
+
+ m_sets.erase(resultSetId);
+ }
+ else
+ {
+ package.response() = present_package.response();
+ }
+ delete id;
+}
+
void yf::Virt_db::Rep::search(Package &package, Z_APDU *apdu, bool &move_later)
{
Z_SearchRequest *req = apdu->u.searchRequest;
support_named_result_sets);
}
+void yf::Frontend::search(Package &package, Z_APDU *apdu,
+ const std::map<std::string, Virt_db_map> &maps)
+{
+ Z_SearchRequest *req = apdu->u.searchRequest;
+ std::string vhost;
+ std::string database;
+ std::string resultSetId = req->resultSetName;
+ bool support_named_result_sets = false; // whether backend supports it
+ yp2::odr odr;
+
+ if (req->num_databaseNames != 1)
+ { // exactly one database must be specified
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.searchResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr, YAZ_BIB1_TOO_MANY_DATABASES_SPECIFIED, 0);
+ package.response() = apdu;
+
+ return;
+ }
+ database = req->databaseNames[0];
+ std::map<std::string, Virt_db_map>::const_iterator map_it;
+ map_it = maps.find(database);
+ if (map_it == maps.end())
+ { // no map for database: return diagnostic
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.searchResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr, YAZ_BIB1_DATABASE_DOES_NOT_EXIST, database.c_str());
+ package.response() = apdu;
+
+ return;
+ }
+ if (*req->replaceIndicator == 0)
+ {
+ Sets_it sets_it = m_sets.find(req->resultSetName);
+ if (sets_it != m_sets.end())
+ {
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.searchResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr,
+ YAZ_BIB1_RESULT_SET_EXISTS_AND_REPLACE_INDICATOR_OFF,
+ 0);
+ package.response() = apdu;
+
+ return;
+ }
+ }
+ m_sets.erase(req->resultSetName);
+ vhost = map_it->second.m_vhost;
+ // we might look for an existing session with same vhost
+ Session id;
+ const char *vhost_cstr = vhost.c_str();
+ if (true)
+ { // sending init to backend
+ Package init_package(id, package.origin());
+ init_package.copy_filter(package);
+
+ Z_APDU *init_apdu = zget_APDU(odr, Z_APDU_initRequest);
+
+ yaz_oi_set_string_oidval(&init_apdu->u.initRequest->otherInfo, odr,
+ VAL_PROXY, 1, vhost_cstr);
+
+ init_package.request() = init_apdu;
+
+ init_package.move(); // sending init
+
+ if (init_package.session().is_closed())
+ {
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.searchResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
+ package.response() = apdu;
+ }
+ Z_GDU *gdu = init_package.response().get();
+ // we hope to get an init response
+ if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
+ Z_APDU_initResponse)
+ {
+ if (ODR_MASK_GET(gdu->u.z3950->u.initResponse->options,
+ Z_Options_namedResultSets))
+ support_named_result_sets = true;
+ }
+ else
+ {
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.searchResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
+ package.response() = apdu;
+
+ return;
+ }
+ }
+ // sending search to backend
+ Package search_package(id, package.origin());
+
+ search_package.copy_filter(package);
+ const char *sep = strchr(vhost_cstr, '/');
+ if (sep)
+ req->databaseNames[0] = odr_strdup(odr, sep+1);
+
+ *req->replaceIndicator = 1;
+
+ std::string backend_resultSetId = "default";
+ req->resultSetName = odr_strdup(odr, backend_resultSetId.c_str());
+ search_package.request() = yazpp_1::GDU(apdu);
+
+ search_package.move();
+
+ if (search_package.session().is_closed())
+ {
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_searchResponse);
+
+ Z_Records *rec = (Z_Records *) odr_malloc(odr, sizeof(Z_Records));
+ apdu->u.searchResponse->records = rec;
+ rec->which = Z_Records_NSD;
+ rec->u.nonSurrogateDiagnostic =
+ zget_DefaultDiagFormat(
+ odr, YAZ_BIB1_DATABASE_UNAVAILABLE, database.c_str());
+ package.response() = apdu;
+
+ return;
+ }
+ package.response() = search_package.response();
+
+ m_sets[resultSetId] =
+ Virt_db_set(id, backend_resultSetId, vhost,
+ support_named_result_sets);
+}
+
void yf::Virt_db::Rep::init(Package &package, Z_APDU *apdu, bool &move_later)
{
release_session(package);
else
{
m_sessions[package.session()] = Virt_db_session(package.session(), true);
- move_later = true;
+ package.move();
}
}
m_p->m_maps[db] = Virt_db_map(vhost);
}
+#if 0
+void yf::Virt_db::process(Package &package) const
+{
+ yf::Frontend *f = m_p->get_frontend(package);
+ if (f)
+ {
+ Z_GDU *gdu = package.request().get();
+ if (!gdu || gdu->which != Z_GDU_Z3950 || f->m_use_vhost)
+ package.move();
+ else
+ {
+ Z_APDU *apdu = gdu->u.z3950;
+ if (apdu->which == Z_APDU_initRequest)
+ {
+ Z_InitRequest *req = apdu->u.initRequest;
+
+ const char *vhost =
+ yaz_oi_get_string_oidval(&req->otherInfo, VAL_PROXY, 1, 0);
+ if (!vhost)
+ {
+ yp2::odr odr;
+ Z_APDU *apdu = zget_APDU(odr, Z_APDU_initResponse);
+ Z_InitResponse *resp = apdu->u.initResponse;
+
+ int i;
+ static const int masks[] = {
+ Z_Options_search, Z_Options_present, Z_Options_namedResultSets, -1
+ };
+ for (i = 0; masks[i] != -1; i++)
+ if (ODR_MASK_GET(req->options, masks[i]))
+ ODR_MASK_SET(resp->options, masks[i]);
+
+ static const int versions[] = {
+ Z_ProtocolVersion_1,
+ Z_ProtocolVersion_2,
+ Z_ProtocolVersion_3,
+ -1
+ };
+ for (i = 0; versions[i] != -1; i++)
+ if (ODR_MASK_GET(req->protocolVersion, versions[i]))
+ ODR_MASK_SET(resp->protocolVersion, versions[i]);
+ else
+ break;
+
+ package.response() = apdu;
+ }
+ else
+ {
+ f->m_use_vhost = true;
+ package.move();
+ }
+ }
+ else if (apdu->which == Z_APDU_searchRequest)
+ {
+ f->search(package, apdu, m_p->m_maps);
+ }
+ else if (apdu->which == Z_APDU_presentRequest)
+ {
+ f->present(package, apdu);
+ }
+ else
+ {
+ yp2::odr odr;
+
+ package.response() = odr.create_close(
+ Z_Close_protocolError,
+ "unsupported APDU in filter_virt_db");
+
+ package.session().close();
+ }
+ }
+ }
+ m_p->release_frontend(package);
+}
+
+#else
void yf::Virt_db::process(Package &package) const
{
Z_GDU *gdu = package.request().get();
package.move();
}
}
+#endif
+
+
+static yp2::filter::Base* filter_creator()
+{
+ return new yp2::filter::Virt_db;
+}
+
+extern "C" {
+ const struct yp2_filter_struct yp2_filter_virt_db = {
+ 0,
+ "virt_db",
+ filter_creator
+ };
+}
/*
projects / metaproxy-moved-to-github.git / blobdiff