-/* $Id: filter_session_shared.cpp,v 1.8 2006-05-15 10:34:40 adam Exp $
- Copyright (c) 2005-2006, Index Data.
+/* This file is part of Metaproxy.
+ Copyright (C) 2005-2008 Index Data
-%LICENSE%
- */
+Metaproxy is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 2, or (at your option) any later
+version.
+
+Metaproxy is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+*/
#include "config.hpp"
#include <boost/thread/mutex.hpp>
#include <boost/thread/condition.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/thread/xtime.hpp>
#include <boost/shared_ptr.hpp>
+#include <boost/format.hpp>
#include "util.hpp"
#include "filter_session_shared.hpp"
#include <yaz/zgdu.h>
#include <yaz/otherinfo.h>
#include <yaz/diagbib1.h>
-
+#include <yazpp/z-query.h>
#include <map>
#include <iostream>
+#include <time.h>
namespace mp = metaproxy_1;
-namespace yf = mp::filter;
+namespace yf = metaproxy_1::filter;
namespace metaproxy_1 {
namespace filter {
- int memcmp2(const void *buf1, int len1, const void *buf2, int len2);
-
+ // key for session.. We'll only share sessions with same InitKey
class SessionShared::InitKey {
public:
bool operator < (const SessionShared::InitKey &k) const;
InitKey(Z_InitRequest *req);
+ InitKey(const InitKey &);
+ ~InitKey();
private:
char *m_idAuthentication_buf;
int m_idAuthentication_size;
char *m_otherInfo_buf;
int m_otherInfo_size;
- mp::odr m_odr;
-
- std::list<std::string> m_targets;
+ ODR m_odr;
+ };
+ // worker thread .. for expiry of sessions
+ class SessionShared::Worker {
+ public:
+ Worker(SessionShared::Rep *rep);
+ void operator() (void);
+ private:
+ SessionShared::Rep *m_p;
};
- class SessionShared::BackendClass {
+ // backend result set
+ class SessionShared::BackendSet {
+ public:
+ std::string m_result_set_id;
+ Databases m_databases;
+ int m_result_set_size;
+ yazpp_1::Yaz_Z_Query m_query;
+ time_t m_time_last_use;
+ void timestamp();
+ BackendSet(
+ const std::string &result_set_id,
+ const Databases &databases,
+ const yazpp_1::Yaz_Z_Query &query);
+ bool search(
+ Package &frontend_package,
+ const Z_APDU *apdu_req,
+ const BackendInstancePtr bp,
+ bool &fatal_error);
+ };
+ // backend connection instance
+ class SessionShared::BackendInstance {
+ friend class Rep;
+ friend class BackendClass;
+ friend class BackendSet;
+ public:
+ mp::Session m_session;
+ BackendSetList m_sets;
+ bool m_in_use;
+ int m_sequence_this;
+ int m_result_set_sequence;
+ time_t m_time_last_use;
+ mp::Package * m_close_package;
+ ~BackendInstance();
+ };
+ // backends of some class (all with same InitKey)
+ class SessionShared::BackendClass : boost::noncopyable {
+ friend class Rep;
+ friend struct Frontend;
+ bool m_named_result_sets;
+ BackendInstanceList m_backend_list;
+ BackendInstancePtr create_backend(const Package &package);
+ void remove_backend(BackendInstancePtr b);
+ BackendInstancePtr get_backend(const Package &package);
+ void use_backend(BackendInstancePtr b);
+ void release_backend(BackendInstancePtr b);
+ void expire_class();
+ yazpp_1::GDU m_init_request;
yazpp_1::GDU m_init_response;
+ boost::mutex m_mutex_backend_class;
+ int m_sequence_top;
+ time_t m_backend_set_ttl;
+ time_t m_backend_expiry_ttl;
+ size_t m_backend_set_max;
+ public:
+ BackendClass(const yazpp_1::GDU &init_request,
+ int resultset_ttl,
+ int resultset_max,
+ int session_ttl);
+ ~BackendClass();
};
+ // frontend result set
+ class SessionShared::FrontendSet {
+ Databases m_databases;
+ yazpp_1::Yaz_Z_Query m_query;
+ public:
+ const Databases &get_databases();
+ const yazpp_1::Yaz_Z_Query &get_query();
+ FrontendSet(
+ const Databases &databases,
+ const yazpp_1::Yaz_Z_Query &query);
+ FrontendSet();
+ };
+ // frontend session
struct SessionShared::Frontend {
- void init(Package &package, Z_GDU *gdu);
Frontend(Rep *rep);
~Frontend();
- mp::Session m_session;
bool m_is_virtual;
bool m_in_use;
+ Z_Options m_init_options;
+ void search(Package &package, Z_APDU *apdu);
+ void present(Package &package, Z_APDU *apdu);
+ void scan(Package &package, Z_APDU *apdu);
+
+ void get_set(mp::Package &package,
+ const Z_APDU *apdu_req,
+ const Databases &databases,
+ yazpp_1::Yaz_Z_Query &query,
+ BackendInstancePtr &found_backend,
+ BackendSetPtr &found_set);
+ void override_set(BackendInstancePtr &found_backend,
+ std::string &result_set_id);
- void close(Package &package);
Rep *m_p;
+ BackendClassPtr m_backend_class;
+ FrontendSets m_frontend_sets;
};
+ // representation
class SessionShared::Rep {
friend class SessionShared;
friend struct Frontend;
FrontendPtr get_frontend(Package &package);
void release_frontend(Package &package);
+ Rep();
+ public:
+ void expire();
private:
+ void init(Package &package, const Z_GDU *gdu,
+ FrontendPtr frontend);
boost::mutex m_mutex;
boost::condition m_cond_session_ready;
std::map<mp::Session, FrontendPtr> m_clients;
- typedef std::map<InitKey,BackendClass> BackendClassMap;
BackendClassMap m_backend_map;
+ boost::mutex m_mutex_backend_map;
+ boost::thread_group m_thrds;
+ int m_resultset_ttl;
+ int m_resultset_max;
+ int m_session_ttl;
};
}
}
-int yf::memcmp2(const void *buf1, int len1,
- const void *buf2, int len2)
+yf::SessionShared::FrontendSet::FrontendSet(
+ const Databases &databases,
+ const yazpp_1::Yaz_Z_Query &query)
+ : m_databases(databases), m_query(query)
{
- int d = len1 - len2;
+}
+
+const yf::SessionShared::Databases &
+yf::SessionShared::FrontendSet::get_databases()
+{
+ return m_databases;
+}
- // compare buffer (common length)
- int c = memcmp(buf1, buf2, d > 0 ? len2 : len1);
- if (c > 0)
- return 1;
- else if (c < 0)
- return -1;
+const yazpp_1::Yaz_Z_Query& yf::SessionShared::FrontendSet::get_query()
+{
+ return m_query;
+}
+
+yf::SessionShared::InitKey::InitKey(const InitKey &k)
+{
+ m_odr = odr_createmem(ODR_ENCODE);
- // compare (remaining bytes)
- if (d > 0)
- return 1;
- else if (d < 0)
- return -1;
- return 0;
+ m_idAuthentication_size = k.m_idAuthentication_size;
+ m_idAuthentication_buf = (char*)odr_malloc(m_odr, m_idAuthentication_size);
+ memcpy(m_idAuthentication_buf, k.m_idAuthentication_buf,
+ m_idAuthentication_size);
+
+ m_otherInfo_size = k.m_otherInfo_size;
+ m_otherInfo_buf = (char*)odr_malloc(m_odr, m_otherInfo_size);
+ memcpy(m_otherInfo_buf, k.m_otherInfo_buf,
+ m_otherInfo_size);
}
yf::SessionShared::InitKey::InitKey(Z_InitRequest *req)
{
+ m_odr = odr_createmem(ODR_ENCODE);
+
Z_IdAuthentication *t = req->idAuthentication;
-
z_IdAuthentication(m_odr, &t, 1, 0);
m_idAuthentication_buf =
odr_getbuf(m_odr, &m_idAuthentication_size, 0);
m_otherInfo_buf = odr_getbuf(m_odr, &m_otherInfo_size, 0);
}
+yf::SessionShared::InitKey::~InitKey()
+{
+ odr_destroy(m_odr);
+}
+
bool yf::SessionShared::InitKey::operator < (const SessionShared::InitKey &k)
const
{
int c;
- c = memcmp2((void*) m_idAuthentication_buf, m_idAuthentication_size,
- (void*) k.m_idAuthentication_buf, k.m_idAuthentication_size);
+ c = mp::util::memcmp2(
+ (void*) m_idAuthentication_buf, m_idAuthentication_size,
+ (void*) k.m_idAuthentication_buf, k.m_idAuthentication_size);
if (c < 0)
return true;
else if (c > 0)
return false;
- c = memcmp2((void*) m_otherInfo_buf, m_otherInfo_size,
- (void*) k.m_otherInfo_buf, k.m_otherInfo_size);
+ c = mp::util::memcmp2((void*) m_otherInfo_buf, m_otherInfo_size,
+ (void*) k.m_otherInfo_buf, k.m_otherInfo_size);
if (c < 0)
return true;
else if (c > 0)
return false;
}
-void yf::SessionShared::Frontend::init(Package &package, Z_GDU *gdu)
+void yf::SessionShared::BackendClass::release_backend(BackendInstancePtr b)
+{
+ boost::mutex::scoped_lock lock(m_mutex_backend_class);
+ b->m_in_use = false;
+}
+
+
+void yf::SessionShared::BackendClass::remove_backend(BackendInstancePtr b)
+{
+ BackendInstanceList::iterator it = m_backend_list.begin();
+
+ while (it != m_backend_list.end())
+ {
+ if (*it == b)
+ {
+ mp::odr odr;
+ (*it)->m_close_package->response() = odr.create_close(
+ 0, Z_Close_lackOfActivity, 0);
+ (*it)->m_close_package->session().close();
+ (*it)->m_close_package->move();
+
+ it = m_backend_list.erase(it);
+ }
+ else
+ it++;
+ }
+}
+
+
+
+yf::SessionShared::BackendInstancePtr
+yf::SessionShared::BackendClass::get_backend(
+ const mp::Package &frontend_package)
+{
+ {
+ boost::mutex::scoped_lock lock(m_mutex_backend_class);
+
+ BackendInstanceList::const_iterator it = m_backend_list.begin();
+
+ BackendInstancePtr backend1; // null
+
+ for (; it != m_backend_list.end(); it++)
+ {
+ if (!(*it)->m_in_use)
+ {
+ if (!backend1
+ || (*it)->m_sequence_this < backend1->m_sequence_this)
+ backend1 = *it;
+ }
+ }
+ if (backend1)
+ {
+ use_backend(backend1);
+ return backend1;
+ }
+ }
+ return create_backend(frontend_package);
+}
+
+void yf::SessionShared::BackendClass::use_backend(BackendInstancePtr backend)
+{
+ backend->m_in_use = true;
+ time(&backend->m_time_last_use);
+ backend->m_sequence_this = m_sequence_top++;
+}
+
+yf::SessionShared::BackendInstance::~BackendInstance()
+{
+ delete m_close_package;
+}
+
+yf::SessionShared::BackendInstancePtr yf::SessionShared::BackendClass::create_backend(
+ const mp::Package &frontend_package)
+{
+ BackendInstancePtr bp(new BackendInstance);
+ BackendInstancePtr null;
+
+ bp->m_close_package =
+ new mp::Package(bp->m_session, frontend_package.origin());
+ bp->m_close_package->copy_filter(frontend_package);
+
+ Package init_package(bp->m_session, frontend_package.origin());
+
+ init_package.copy_filter(frontend_package);
+
+ yazpp_1::GDU actual_init_request = m_init_request;
+ Z_GDU *init_pdu = actual_init_request.get();
+
+ assert(init_pdu->which == Z_GDU_Z3950);
+ assert(init_pdu->u.z3950->which == Z_APDU_initRequest);
+
+ Z_InitRequest *req = init_pdu->u.z3950->u.initRequest;
+ ODR_MASK_ZERO(req->options);
+
+ ODR_MASK_SET(req->options, Z_Options_search);
+ ODR_MASK_SET(req->options, Z_Options_present);
+ ODR_MASK_SET(req->options, Z_Options_namedResultSets);
+ ODR_MASK_SET(req->options, Z_Options_scan);
+
+ ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_1);
+ ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_2);
+ ODR_MASK_SET(req->protocolVersion, Z_ProtocolVersion_3);
+
+ init_package.request() = init_pdu;
+
+ init_package.move();
+
+ boost::mutex::scoped_lock lock(m_mutex_backend_class);
+
+ m_named_result_sets = false;
+ Z_GDU *gdu = init_package.response().get();
+ if (!init_package.session().is_closed()
+ && gdu && gdu->which == Z_GDU_Z3950
+ && gdu->u.z3950->which == Z_APDU_initResponse)
+ {
+ Z_InitResponse *res = gdu->u.z3950->u.initResponse;
+ if (!*res->result)
+ return null;
+ m_init_response = gdu->u.z3950;
+ if (ODR_MASK_GET(res->options, Z_Options_namedResultSets))
+ {
+ m_named_result_sets = true;
+ }
+ }
+ else
+ {
+ // did not receive an init response or closed
+ return null;
+ }
+ bp->m_in_use = true;
+ time(&bp->m_time_last_use);
+ bp->m_sequence_this = 0;
+ bp->m_result_set_sequence = 0;
+ m_backend_list.push_back(bp);
+
+ return bp;
+}
+
+
+yf::SessionShared::BackendClass::BackendClass(const yazpp_1::GDU &init_request,
+ int resultset_ttl,
+ int resultset_max,
+ int session_ttl)
+ : m_named_result_sets(false), m_init_request(init_request),
+ m_sequence_top(0), m_backend_set_ttl(resultset_ttl),
+ m_backend_expiry_ttl(session_ttl), m_backend_set_max(resultset_max)
+{}
+
+yf::SessionShared::BackendClass::~BackendClass()
+{}
+
+void yf::SessionShared::Rep::init(mp::Package &package, const Z_GDU *gdu,
+ FrontendPtr frontend)
{
Z_InitRequest *req = gdu->u.z3950->u.initRequest;
- std::list<std::string> targets;
+ frontend->m_is_virtual = true;
+ frontend->m_init_options = *req->options;
+ InitKey k(req);
+ {
+ boost::mutex::scoped_lock lock(m_mutex_backend_map);
+ BackendClassMap::const_iterator it;
+ it = m_backend_map.find(k);
+ if (it == m_backend_map.end())
+ {
+ BackendClassPtr b(new BackendClass(gdu->u.z3950,
+ m_resultset_ttl,
+ m_resultset_max,
+ m_session_ttl));
+ m_backend_map[k] = b;
+ frontend->m_backend_class = b;
+ }
+ else
+ {
+ frontend->m_backend_class = it->second;
+ }
+ }
+ BackendClassPtr bc = frontend->m_backend_class;
+ BackendInstancePtr backend = bc->get_backend(package);
+
+ mp::odr odr;
+ if (!backend)
+ {
+ Z_APDU *apdu = odr.create_initResponse(gdu->u.z3950, 0, 0);
+ *apdu->u.initResponse->result = 0;
+ package.response() = apdu;
+ package.session().close();
+ }
+ else
+ {
+ boost::mutex::scoped_lock lock(bc->m_mutex_backend_class);
+ yazpp_1::GDU init_response = bc->m_init_response;
+ Z_GDU *response_gdu = init_response.get();
+ mp::util::transfer_referenceId(odr, gdu->u.z3950,
+ response_gdu->u.z3950);
+
+ Z_Options *server_options =
+ response_gdu->u.z3950->u.initResponse->options;
+ Z_Options *client_options = &frontend->m_init_options;
+
+ int i;
+ for (i = 0; i<30; i++)
+ if (!ODR_MASK_GET(client_options, i))
+ ODR_MASK_CLEAR(server_options, i);
+ package.response() = init_response;
+ }
+ if (backend)
+ bc->release_backend(backend);
+}
+
+void yf::SessionShared::BackendSet::timestamp()
+{
+ time(&m_time_last_use);
+}
+
+yf::SessionShared::BackendSet::BackendSet(
+ const std::string &result_set_id,
+ const Databases &databases,
+ const yazpp_1::Yaz_Z_Query &query) :
+ m_result_set_id(result_set_id),
+ m_databases(databases), m_result_set_size(0), m_query(query)
+{
+ timestamp();
+}
+
+bool yf::SessionShared::BackendSet::search(
+ mp::Package &frontend_package,
+ const Z_APDU *frontend_apdu,
+ const BackendInstancePtr bp,
+ bool & fatal_error)
+{
+ Package search_package(bp->m_session, frontend_package.origin());
+
+ search_package.copy_filter(frontend_package);
- mp::util::get_vhost_otherinfo(&req->otherInfo, false, targets);
+ mp::odr odr;
+ Z_APDU *apdu_req = zget_APDU(odr, Z_APDU_searchRequest);
+ Z_SearchRequest *req = apdu_req->u.searchRequest;
- if (targets.size() < 1)
+ req->resultSetName = odr_strdup(odr, m_result_set_id.c_str());
+ req->query = m_query.get_Z_Query();
+
+ req->num_databaseNames = m_databases.size();
+ req->databaseNames = (char**)
+ odr_malloc(odr, req->num_databaseNames * sizeof(char *));
+ Databases::const_iterator it = m_databases.begin();
+ size_t i = 0;
+ for (; it != m_databases.end(); it++)
+ req->databaseNames[i++] = odr_strdup(odr, it->c_str());
+
+ search_package.request() = apdu_req;
+
+ search_package.move();
+ fatal_error = false; // assume backend session is good
+
+ Z_Records *z_records_diag = 0;
+ Z_GDU *gdu = search_package.response().get();
+ if (!search_package.session().is_closed()
+ && gdu && gdu->which == Z_GDU_Z3950
+ && gdu->u.z3950->which == Z_APDU_searchResponse)
{
- package.move();
+ Z_SearchResponse *b_resp = gdu->u.z3950->u.searchResponse;
+ if (b_resp->records)
+ {
+ if (b_resp->records->which == Z_Records_NSD
+ || b_resp->records->which == Z_Records_multipleNSD)
+ z_records_diag = b_resp->records;
+ }
+ if (z_records_diag)
+ {
+ // there could be diagnostics that are so bad.. that
+ // we simply mark the error as fatal.. For now we assume
+ // we can resume
+ if (frontend_apdu->which == Z_APDU_searchRequest)
+ {
+ Z_APDU *f_apdu = odr.create_searchResponse(frontend_apdu,
+ 0, 0);
+ Z_SearchResponse *f_resp = f_apdu->u.searchResponse;
+ *f_resp->searchStatus = *b_resp->searchStatus;
+ f_resp->records = z_records_diag;
+ frontend_package.response() = f_apdu;
+ return false;
+ }
+ if (frontend_apdu->which == Z_APDU_presentRequest)
+ {
+ Z_APDU *f_apdu = odr.create_presentResponse(frontend_apdu,
+ 0, 0);
+ Z_PresentResponse *f_resp = f_apdu->u.presentResponse;
+ f_resp->records = z_records_diag;
+ frontend_package.response() = f_apdu;
+ return false;
+ }
+ }
+ m_result_set_size = *b_resp->resultCount;
+ return true;
+ }
+ Z_APDU *f_apdu = 0;
+ if (frontend_apdu->which == Z_APDU_searchRequest)
+ f_apdu = odr.create_searchResponse(
+ frontend_apdu, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ else if (frontend_apdu->which == Z_APDU_presentRequest)
+ f_apdu = odr.create_presentResponse(
+ frontend_apdu, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ else
+ f_apdu = odr.create_close(
+ frontend_apdu, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ frontend_package.response() = f_apdu;
+ fatal_error = true; // weired response.. bad backend
+ return false;
+}
+
+void yf::SessionShared::Frontend::override_set(
+ BackendInstancePtr &found_backend,
+ std::string &result_set_id)
+{
+ BackendClassPtr bc = m_backend_class;
+ BackendInstanceList::const_iterator it = bc->m_backend_list.begin();
+ time_t now;
+ time(&now);
+
+ for (; it != bc->m_backend_list.end(); it++)
+ {
+ if (!(*it)->m_in_use)
+ {
+ BackendSetList::iterator set_it = (*it)->m_sets.begin();
+ for (; set_it != (*it)->m_sets.end(); set_it++)
+ {
+ if (now >= (*set_it)->m_time_last_use &&
+ now - (*set_it)->m_time_last_use > bc->m_backend_set_ttl)
+ {
+ found_backend = *it;
+ result_set_id = (*set_it)->m_result_set_id;
+ found_backend->m_sets.erase(set_it);
+ return;
+ }
+ }
+ }
+ }
+ size_t max_sets = bc->m_named_result_sets ? bc->m_backend_set_max : 1;
+ for (it = bc->m_backend_list.begin(); it != bc->m_backend_list.end(); it++)
+ {
+ if (!(*it)->m_in_use && (*it)->m_sets.size() < max_sets)
+ {
+ found_backend = *it;
+ if (bc->m_named_result_sets)
+ {
+ result_set_id = boost::io::str(
+ boost::format("%1%") %
+ found_backend->m_result_set_sequence);
+ found_backend->m_result_set_sequence++;
+ }
+ else
+ result_set_id = "default";
+ return;
+ }
+ }
+}
+
+void yf::SessionShared::Frontend::get_set(mp::Package &package,
+ const Z_APDU *apdu_req,
+ const Databases &databases,
+ yazpp_1::Yaz_Z_Query &query,
+ BackendInstancePtr &found_backend,
+ BackendSetPtr &found_set)
+{
+ bool session_restarted = false;
+
+restart:
+ std::string result_set_id;
+ BackendClassPtr bc = m_backend_class;
+ {
+ boost::mutex::scoped_lock lock(bc->m_mutex_backend_class);
+
+ // look at each backend and see if we have a similar search
+ BackendInstanceList::const_iterator it = bc->m_backend_list.begin();
+
+ for (; it != bc->m_backend_list.end(); it++)
+ {
+ if (!(*it)->m_in_use)
+ {
+ BackendSetList::const_iterator set_it = (*it)->m_sets.begin();
+ for (; set_it != (*it)->m_sets.end(); set_it++)
+ {
+ if ((*set_it)->m_databases == databases
+ && query.match(&(*set_it)->m_query))
+ {
+ found_set = *set_it;
+ found_backend = *it;
+ bc->use_backend(found_backend);
+ found_set->timestamp();
+ // found matching set. No need to search again
+ return;
+ }
+ }
+ }
+ }
+ override_set(found_backend, result_set_id);
+ if (found_backend)
+ bc->use_backend(found_backend);
+ }
+ if (!found_backend)
+ {
+ // create a new backend set (and new set)
+ found_backend = bc->create_backend(package);
+
+ if (!found_backend)
+ {
+ Z_APDU *f_apdu = 0;
+ mp::odr odr;
+ if (apdu_req->which == Z_APDU_searchRequest)
+ {
+ f_apdu = odr.create_searchResponse(
+ apdu_req, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ }
+ else if (apdu_req->which == Z_APDU_presentRequest)
+ {
+ f_apdu = odr.create_presentResponse(
+ apdu_req, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ }
+ else
+ {
+ f_apdu = odr.create_close(
+ apdu_req, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ }
+ package.response() = f_apdu;
+ return;
+ }
+ if (bc->m_named_result_sets)
+ {
+ result_set_id = boost::io::str(
+ boost::format("%1%") % found_backend->m_result_set_sequence);
+ found_backend->m_result_set_sequence++;
+ }
+ else
+ result_set_id = "default";
+ }
+ // we must search ...
+ BackendSetPtr new_set(new BackendSet(result_set_id,
+ databases, query));
+ bool fatal_error = false;
+ if (!new_set->search(package, apdu_req, found_backend, fatal_error))
+ {
+ if (fatal_error)
+ bc->remove_backend(found_backend);
+ else
+ bc->release_backend(found_backend);
+ return; // search error
+ }
+ if (!session_restarted && new_set->m_result_set_size < 0)
+ {
+ bc->remove_backend(found_backend);
+ session_restarted = true;
+ found_backend.reset();
+ goto restart;
+ }
+
+ found_set = new_set;
+ found_set->timestamp();
+ found_backend->m_sets.push_back(found_set);
+}
+
+void yf::SessionShared::Frontend::search(mp::Package &package,
+ Z_APDU *apdu_req)
+{
+ Z_SearchRequest *req = apdu_req->u.searchRequest;
+ FrontendSets::iterator fset_it =
+ m_frontend_sets.find(req->resultSetName);
+ if (fset_it != m_frontend_sets.end())
+ {
+ // result set already exist
+ // if replace indicator is off: we return diagnostic if
+ // result set already exist.
+ if (*req->replaceIndicator == 0)
+ {
+ mp::odr odr;
+ Z_APDU *apdu =
+ odr.create_searchResponse(
+ apdu_req,
+ YAZ_BIB1_RESULT_SET_EXISTS_AND_REPLACE_INDICATOR_OFF,
+ 0);
+ package.response() = apdu;
+
+ return;
+ }
+ m_frontend_sets.erase(fset_it);
+ }
+
+ yazpp_1::Yaz_Z_Query query;
+ query.set_Z_Query(req->query);
+ Databases databases;
+ int i;
+ for (i = 0; i<req->num_databaseNames; i++)
+ databases.push_back(req->databaseNames[i]);
+
+ BackendSetPtr found_set; // null
+ BackendInstancePtr found_backend; // null
+
+ get_set(package, apdu_req, databases, query, found_backend, found_set);
+ if (!found_set)
+ return;
+
+ mp::odr odr;
+ Z_APDU *f_apdu = odr.create_searchResponse(apdu_req, 0, 0);
+ Z_SearchResponse *f_resp = f_apdu->u.searchResponse;
+ *f_resp->resultCount = found_set->m_result_set_size;
+ package.response() = f_apdu;
+
+ FrontendSetPtr fset(new FrontendSet(databases, query));
+ m_frontend_sets[req->resultSetName] = fset;
+
+ m_backend_class->release_backend(found_backend);
+}
+
+void yf::SessionShared::Frontend::present(mp::Package &package,
+ Z_APDU *apdu_req)
+{
+ mp::odr odr;
+ Z_PresentRequest *req = apdu_req->u.presentRequest;
+
+ FrontendSets::iterator fset_it =
+ m_frontend_sets.find(req->resultSetId);
+
+ if (fset_it == m_frontend_sets.end())
+ {
+ Z_APDU *apdu =
+ odr.create_presentResponse(
+ apdu_req,
+ YAZ_BIB1_SPECIFIED_RESULT_SET_DOES_NOT_EXIST,
+ req->resultSetId);
+ package.response() = apdu;
return;
}
+ FrontendSetPtr fset = fset_it->second;
+
+ Databases databases = fset->get_databases();
+ yazpp_1::Yaz_Z_Query query = fset->get_query();
+
+ BackendClassPtr bc = m_backend_class;
+ BackendSetPtr found_set; // null
+ BackendInstancePtr found_backend;
+
+ get_set(package, apdu_req, databases, query, found_backend, found_set);
+ if (!found_set)
+ return;
+
+ Z_APDU *p_apdu = zget_APDU(odr, Z_APDU_presentRequest);
+ Z_PresentRequest *p_req = p_apdu->u.presentRequest;
+ p_req->preferredRecordSyntax = req->preferredRecordSyntax;
+ p_req->resultSetId = odr_strdup(odr, found_set->m_result_set_id.c_str());
+ *p_req->resultSetStartPoint = *req->resultSetStartPoint;
+ *p_req->numberOfRecordsRequested = *req->numberOfRecordsRequested;
+ p_req->preferredRecordSyntax = req->preferredRecordSyntax;
+ p_req->recordComposition = req->recordComposition;
+ Package present_package(found_backend->m_session, package.origin());
+ present_package.copy_filter(package);
+
+ present_package.request() = p_apdu;
+
+ present_package.move();
+
+ Z_GDU *gdu = present_package.response().get();
+ if (!present_package.session().is_closed()
+ && gdu && gdu->which == Z_GDU_Z3950
+ && gdu->u.z3950->which == Z_APDU_presentResponse)
+ {
+ Z_PresentResponse *b_resp = gdu->u.z3950->u.presentResponse;
+ Z_APDU *f_apdu_res = odr.create_presentResponse(apdu_req, 0, 0);
+ Z_PresentResponse *f_resp = f_apdu_res->u.presentResponse;
+
+ f_resp->numberOfRecordsReturned = b_resp->numberOfRecordsReturned;
+ f_resp->nextResultSetPosition = b_resp->nextResultSetPosition;
+ f_resp->presentStatus= b_resp->presentStatus;
+ f_resp->records = b_resp->records;
+ f_resp->otherInfo = b_resp->otherInfo;
+ package.response() = f_apdu_res;
+ bc->release_backend(found_backend);
+ }
+ else
+ {
+ bc->remove_backend(found_backend);
+ Z_APDU *f_apdu_res =
+ odr.create_presentResponse(
+ apdu_req, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ package.response() = f_apdu_res;
+ }
}
-yf::SessionShared::SessionShared() : m_p(new SessionShared::Rep)
+void yf::SessionShared::Frontend::scan(mp::Package &frontend_package,
+ Z_APDU *apdu_req)
{
+ BackendClassPtr bc = m_backend_class;
+ BackendInstancePtr backend = bc->get_backend(frontend_package);
+ if (!backend)
+ {
+ mp::odr odr;
+ Z_APDU *apdu = odr.create_scanResponse(
+ apdu_req, YAZ_BIB1_TEMPORARY_SYSTEM_ERROR, 0);
+ frontend_package.response() = apdu;
+ }
+ else
+ {
+ Package scan_package(backend->m_session, frontend_package.origin());
+ scan_package.copy_filter(frontend_package);
+ scan_package.request() = apdu_req;
+ scan_package.move();
+ frontend_package.response() = scan_package.response();
+ if (scan_package.session().is_closed())
+ {
+ frontend_package.session().close();
+ bc->remove_backend(backend);
+ }
+ else
+ bc->release_backend(backend);
+ }
}
-yf::SessionShared::~SessionShared() {
+yf::SessionShared::Worker::Worker(SessionShared::Rep *rep) : m_p(rep)
+{
}
+void yf::SessionShared::Worker::operator() (void)
+{
+ m_p->expire();
+}
-yf::SessionShared::Frontend::Frontend(Rep *rep) : m_is_virtual(false), m_p(rep)
+void yf::SessionShared::BackendClass::expire_class()
{
+ time_t now;
+ time(&now);
+ boost::mutex::scoped_lock lock(m_mutex_backend_class);
+ BackendInstanceList::iterator bit = m_backend_list.begin();
+ while (bit != m_backend_list.end())
+ {
+ time_t last_use = (*bit)->m_time_last_use;
+
+ if ((*bit)->m_in_use)
+ {
+ bit++;
+ }
+ else if ((now >= last_use && now - last_use > m_backend_expiry_ttl)
+ || (now < last_use))
+ {
+ mp::odr odr;
+ (*bit)->m_close_package->response() = odr.create_close(
+ 0, Z_Close_lackOfActivity, 0);
+ (*bit)->m_close_package->session().close();
+ (*bit)->m_close_package->move();
+
+ bit = m_backend_list.erase(bit);
+ }
+ else
+ {
+ bit++;
+ }
+ }
}
-void yf::SessionShared::Frontend::close(Package &package)
+void yf::SessionShared::Rep::expire()
{
-#if 0
- std::list<BackendPtr>::const_iterator b_it;
-
- for (b_it = m_backend_list.begin(); b_it != m_backend_list.end(); b_it++)
+ while (true)
{
- (*b_it)->m_backend_session.close();
- Package close_package((*b_it)->m_backend_session, package.origin());
- close_package.copy_filter(package);
- close_package.move((*b_it)->m_route);
+ boost::xtime xt;
+ boost::xtime_get(&xt, boost::TIME_UTC);
+ xt.sec += 30;
+ boost::thread::sleep(xt);
+
+ BackendClassMap::const_iterator b_it = m_backend_map.begin();
+ for (; b_it != m_backend_map.end(); b_it++)
+ b_it->second->expire_class();
}
- m_backend_list.clear();
-#endif
}
+yf::SessionShared::Rep::Rep()
+{
+ m_resultset_ttl = 30;
+ m_resultset_max = 10;
+ m_session_ttl = 90;
+ yf::SessionShared::Worker w(this);
+ m_thrds.add_thread(new boost::thread(w));
+}
+
+yf::SessionShared::SessionShared() : m_p(new SessionShared::Rep)
+{
+}
+
+yf::SessionShared::~SessionShared() {
+}
+
+
+yf::SessionShared::Frontend::Frontend(Rep *rep) : m_is_virtual(false), m_p(rep)
+{
+}
yf::SessionShared::Frontend::~Frontend()
{
}
-yf::SessionShared::FrontendPtr yf::SessionShared::Rep::get_frontend(Package &package)
+yf::SessionShared::FrontendPtr yf::SessionShared::Rep::get_frontend(mp::Package &package)
{
boost::mutex::scoped_lock lock(m_mutex);
return f;
}
-void yf::SessionShared::Rep::release_frontend(Package &package)
+void yf::SessionShared::Rep::release_frontend(mp::Package &package)
{
boost::mutex::scoped_lock lock(m_mutex);
std::map<mp::Session,yf::SessionShared::FrontendPtr>::iterator it;
{
if (package.session().is_closed())
{
- it->second->close(package);
m_clients.erase(it);
}
else
}
-void yf::SessionShared::process(Package &package) const
+void yf::SessionShared::process(mp::Package &package) const
{
FrontendPtr f = m_p->get_frontend(package);
if (gdu && gdu->which == Z_GDU_Z3950 && gdu->u.z3950->which ==
Z_APDU_initRequest && !f->m_is_virtual)
{
- f->init(package, gdu);
+ m_p->init(package, gdu, f);
}
else if (!f->m_is_virtual)
package.move();
package.session().close();
}
+ else if (apdu->which == Z_APDU_close)
+ {
+ mp::odr odr;
+
+ package.response() = odr.create_close(
+ apdu,
+ Z_Close_peerAbort, "received close from client");
+ package.session().close();
+ }
+ else if (apdu->which == Z_APDU_searchRequest)
+ {
+ f->search(package, apdu);
+ }
+ else if (apdu->which == Z_APDU_presentRequest)
+ {
+ f->present(package, apdu);
+ }
+ else if (apdu->which == Z_APDU_scanRequest)
+ {
+ f->scan(package, apdu);
+ }
else
{
mp::odr odr;
m_p->release_frontend(package);
}
+void yf::SessionShared::configure(const xmlNode *ptr, bool test_only)
+{
+ for (ptr = ptr->children; ptr; ptr = ptr->next)
+ {
+ if (ptr->type != XML_ELEMENT_NODE)
+ continue;
+ if (!strcmp((const char *) ptr->name, "resultset"))
+ {
+ const struct _xmlAttr *attr;
+ for (attr = ptr->properties; attr; attr = attr->next)
+ {
+ if (!strcmp((const char *) attr->name, "ttl"))
+ m_p->m_resultset_ttl =
+ mp::xml::get_int(attr->children, 30);
+ else if (!strcmp((const char *) attr->name, "max"))
+ {
+ m_p->m_resultset_max =
+ mp::xml::get_int(attr->children, 10);
+ }
+ else
+ throw mp::filter::FilterException(
+ "Bad attribute " + std::string((const char *)
+ attr->name));
+ }
+ }
+ else if (!strcmp((const char *) ptr->name, "session"))
+ {
+ const struct _xmlAttr *attr;
+ for (attr = ptr->properties; attr; attr = attr->next)
+ {
+ if (!strcmp((const char *) attr->name, "ttl"))
+ m_p->m_session_ttl =
+ mp::xml::get_int(attr->children, 120);
+ else
+ throw mp::filter::FilterException(
+ "Bad attribute " + std::string((const char *)
+ attr->name));
+ }
+ }
+ else
+ {
+ throw mp::filter::FilterException("Bad element "
+ + std::string((const char *)
+ ptr->name));
+ }
+ }
+}
+
static mp::filter::Base* filter_creator()
{
return new mp::filter::SessionShared;
/*
* Local variables:
* c-basic-offset: 4
+ * c-file-style: "Stroustrup"
* indent-tabs-mode: nil
- * c-file-style: "stroustrup"
* End:
* vim: shiftwidth=4 tabstop=8 expandtab
*/
+
projects / metaproxy-moved-to-github.git / blobdiff