src/filter_z3950_client.cpp

   1 /* $Id: filter_z3950_client.cpp,v 1.12 2006-01-02 14:33:42 adam Exp $
   2    Copyright (c) 2005, Index Data.
   3
   4 %LICENSE%
   5  */
   6
   7 #include "config.hpp"
   8
   9 #include "filter.hpp"
  10 #include "router.hpp"
  11 #include "package.hpp"
  12 #include "util.hpp"
  13 #include "filter_z3950_client.hpp"
  14
  15 #include <map>
  16 #include <stdexcept>
  17 #include <list>
  18 #include <iostream>
  19
  20 #include <boost/thread/mutex.hpp>
  21 #include <boost/thread/condition.hpp>
  22
  23 #include <yaz/zgdu.h>
  24 #include <yaz/log.h>
  25 #include <yaz/otherinfo.h>
  26 #include <yaz/diagbib1.h>
  27
  28 #include <yaz++/socket-manager.h>
  29 #include <yaz++/pdu-assoc.h>
  30 #include <yaz++/z-assoc.h>
  31
  32 namespace yf = yp2::filter;
  33
  34 namespace yp2 {
  35     namespace filter {
  36         class Z3950Client::Assoc : public yazpp_1::Z_Assoc{
  37             friend class Rep;
  38             Assoc(yazpp_1::SocketManager *socket_manager,
  39                   yazpp_1::IPDU_Observable *PDU_Observable,
  40                   std::string host);
  41             ~Assoc();
  42             void connectNotify();
  43             void failNotify();
  44             void timeoutNotify();
  45             void recv_GDU(Z_GDU *gdu, int len);
  46             yazpp_1::IPDU_Observer* sessionNotify(
  47                 yazpp_1::IPDU_Observable *the_PDU_Observable,
  48                 int fd);
  49
  50             yazpp_1::SocketManager *m_socket_manager;
  51             yazpp_1::IPDU_Observable *m_PDU_Observable;
  52             Package *m_package;
  53             bool m_in_use;
  54             bool m_waiting;
  55             bool m_destroyed;
  56             bool m_connected;
  57             std::string m_host;
  58         };
  59
  60         class Z3950Client::Rep {
  61         public:
  62             boost::mutex m_mutex;
  63             boost::condition m_cond_session_ready;
  64             std::map<yp2::Session,Z3950Client::Assoc *> m_clients;
  65             Z3950Client::Assoc *get_assoc(Package &package);
  66             void send_and_receive(Package &package,
  67                                   yf::Z3950Client::Assoc *c);
  68             void release_assoc(Package &package);
  69         };
  70     }
  71 }
  72
  73 using namespace yp2;
  74
  75 yf::Z3950Client::Assoc::Assoc(yazpp_1::SocketManager *socket_manager,
  76                               yazpp_1::IPDU_Observable *PDU_Observable,
  77                               std::string host)
  78     :  Z_Assoc(PDU_Observable),
  79        m_socket_manager(socket_manager), m_PDU_Observable(PDU_Observable),
  80        m_package(0), m_in_use(true), m_waiting(false),
  81        m_destroyed(false), m_connected(false), m_host(host)
  82 {
  83     // std::cout << "create assoc " << this << "\n";
  84 }
  85
  86 yf::Z3950Client::Assoc::~Assoc()
  87 {
  88     // std::cout << "destroy assoc " << this << "\n";
  89 }
  90
  91 void yf::Z3950Client::Assoc::connectNotify()
  92 {
  93     m_waiting = false;
  94
  95     m_connected = true;
  96 }
  97
  98 void yf::Z3950Client::Assoc::failNotify()
  99 {
 100     m_waiting = false;
 101
 102     yp2::odr odr;
 103
 104     if (m_package)
 105     {
 106         m_package->response() = odr.create_close(Z_Close_peerAbort, 0);
 107         m_package->session().close();
 108     }
 109 }
 110
 111 void yf::Z3950Client::Assoc::timeoutNotify()
 112 {
 113     m_waiting = false;
 114
 115 #if 0
 116     yp2::odr odr;
 117
 118     if (m_package)
 119     {
 120         m_package->response() = odr.create_close(Z_Close_lackOfActivity, 0);
 121         m_package->session().close();
 122     }
 123 #endif
 124 }
 125
 126 void yf::Z3950Client::Assoc::recv_GDU(Z_GDU *gdu, int len)
 127 {
 128     m_waiting = false;
 129
 130     if (m_package)
 131         m_package->response() = gdu;
 132 }
 133
 134 yazpp_1::IPDU_Observer *yf::Z3950Client::Assoc::sessionNotify(
 135     yazpp_1::IPDU_Observable *the_PDU_Observable,
 136     int fd)
 137 {
 138     return 0;
 139 }
 140
 141
 142 yf::Z3950Client::Z3950Client() :  m_p(new yf::Z3950Client::Rep)
 143 {
 144 }
 145
 146 yf::Z3950Client::~Z3950Client() {
 147 }
 148
 149 yf::Z3950Client::Assoc *yf::Z3950Client::Rep::get_assoc(Package &package)
 150 {
 151     // only one thread messes with the clients list at a time
 152     boost::mutex::scoped_lock lock(m_mutex);
 153
 154     std::map<yp2::Session,yf::Z3950Client::Assoc *>::iterator it;
 155
 156     Z_GDU *gdu = package.request().get();
 157     // only deal with Z39.50
 158     if (!gdu || gdu->which != Z_GDU_Z3950)
 159     {
 160         package.move();
 161         return 0;
 162     }
 163     Z_APDU *apdu = gdu->u.z3950;
 164     while(true)
 165     {
 166         it = m_clients.find(package.session());
 167         if (it == m_clients.end())
 168             break;
 169         if (gdu && gdu->which == Z_GDU_Z3950 &&
 170             gdu->u.z3950->which == Z_APDU_initRequest)
 171         {
 172             yazpp_1::SocketManager *s = it->second->m_socket_manager;
 173             delete it->second;  // destroy Z_Assoc
 174             delete s;    // then manager
 175             m_clients.erase(it);
 176             break;
 177         }
 178         if (!it->second->m_in_use)
 179         {
 180             it->second->m_in_use = true;
 181             return it->second;
 182         }
 183         m_cond_session_ready.wait(lock);
 184     }
 185     // new Z39.50 session ..
 186
 187     // check that it is init. If not, close
 188     if (apdu->which != Z_APDU_initRequest)
 189     {
 190         yp2::odr odr;
 191
 192         package.response() = odr.create_close(Z_Close_protocolError,
 193                                               "First PDU was not an "
 194                                               "Initialize Request");
 195         package.session().close();
 196         return 0;
 197     }
 198     // check virtual host
 199     const char *vhost =
 200         yaz_oi_get_string_oidval(&apdu->u.initRequest->otherInfo,
 201                                  VAL_PROXY, 1, 0);
 202     if (!vhost)
 203     {
 204         yp2::odr odr;
 205         package.response() = odr.create_initResponse(
 206             YAZ_BIB1_INIT_NEGOTIATION_OPTION_REQUIRED,
 207             "Virtual host not given");
 208
 209         package.session().close();
 210         return 0;
 211     }
 212
 213     yazpp_1::SocketManager *sm = new yazpp_1::SocketManager;
 214     yazpp_1::PDU_Assoc *pdu_as = new yazpp_1::PDU_Assoc(sm);
 215     yf::Z3950Client::Assoc *as = new yf::Z3950Client::Assoc(sm, pdu_as, vhost);
 216     m_clients[package.session()] = as;
 217     as->timeout(2);
 218     return as;
 219 }
 220
 221 void yf::Z3950Client::Rep::send_and_receive(Package &package,
 222                                             yf::Z3950Client::Assoc *c)
 223 {
 224     Z_GDU *gdu = package.request().get();
 225
 226     if (!gdu || gdu->which != Z_GDU_Z3950)
 227         return;
 228
 229     c->m_package = &package;
 230     c->m_waiting = true;
 231     if (!c->m_connected)
 232     {
 233         c->client(c->m_host.c_str());
 234
 235         while (!c->m_destroyed && c->m_waiting
 236                && c->m_socket_manager->processEvent() > 0)
 237             ;
 238     }
 239     if (!c->m_connected)
 240     {
 241         return;
 242     }
 243
 244     // prepare response
 245     c->m_waiting = true;
 246
 247     // relay the package  ..
 248     int len;
 249     c->send_GDU(gdu, &len);
 250
 251     switch(gdu->u.z3950->which)
 252     {
 253     case Z_APDU_triggerResourceControlRequest:
 254         // request only..
 255         break;
 256     default:
 257         // for the rest: wait for a response PDU
 258         std::cout << "WAITING...\n";
 259         while (!c->m_destroyed && c->m_waiting
 260                && c->m_socket_manager->processEvent() > 0)
 261             ;
 262         std::cout << "END OF WAITING...\n";
 263         break;
 264     }
 265
 266 }
 267
 268 void yf::Z3950Client::Rep::release_assoc(Package &package)
 269 {
 270     boost::mutex::scoped_lock lock(m_mutex);
 271     std::map<yp2::Session,yf::Z3950Client::Assoc *>::iterator it;
 272
 273     it = m_clients.find(package.session());
 274     if (it != m_clients.end())
 275     {
 276         if (package.session().is_closed())
 277             it->second->m_destroyed = true;
 278
 279         if (it->second->m_destroyed && !it->second->m_in_use)
 280         {
 281             // the Z_Assoc and PDU_Assoc must be destroyed before
 282             // the socket manager.. so pull that out.. first..
 283             yazpp_1::SocketManager *s = it->second->m_socket_manager;
 284             delete it->second;  // destroy Z_Assoc
 285             delete s;    // then manager
 286             m_clients.erase(it);
 287             std::cout << "DESTROY " << package.session().id() << "\n";
 288         }
 289         else
 290         {
 291             it->second->m_in_use = false;
 292         }
 293         m_cond_session_ready.notify_all();
 294     }
 295 }
 296
 297 void yf::Z3950Client::process(Package &package) const
 298 {
 299     yf::Z3950Client::Assoc *c = m_p->get_assoc(package);
 300     if (c)
 301     {
 302         m_p->send_and_receive(package, c);
 303     }
 304     m_p->release_assoc(package);
 305 }
 306
 307
 308 /*
 309  * Local variables:
 310  * c-basic-offset: 4
 311  * indent-tabs-mode: nil
 312  * c-file-style: "stroustrup"
 313  * End:
 314  * vim: shiftwidth=4 tabstop=8 expandtab
 315  */