X-Git-Url: http://lists.indexdata.com/cgi-bin?a=blobdiff_plain;f=src%2Ffilter_sru_to_z3950.cpp;h=bb397656bfe7421fed26bfa851c55ed60b35f2d3;hb=59f87be1f883639171b1293f33691e406d75f5ed;hp=523bdee3e49f5e08b69d7045fc6f9575b5fb9243;hpb=76a98c38e74bf2c4b9f3840d06dce994e268c20b;p=metaproxy-moved-to-github.git

diff --git a/src/filter_sru_to_z3950.cpp b/src/filter_sru_to_z3950.cpp
index 523bdee..bb39765 100644
--- a/src/filter_sru_to_z3950.cpp
+++ b/src/filter_sru_to_z3950.cpp
@@ -1,119 +1,101 @@
-/* $Id: filter_sru_to_z3950.cpp,v 1.11 2006-09-22 11:11:17 marc Exp $
-   Copyright (c) 2005-2006, Index Data.
+/* This file is part of Metaproxy.
+   Copyright (C) 2005-2008 Index Data
 
-   See the LICENSE file for details
- */
+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 "filter.hpp"
 #include "package.hpp"
 #include "util.hpp"
 #include "gduutil.hpp"
+#include "sru_util.hpp"
 #include "filter_sru_to_z3950.hpp"
 
 #include <yaz/zgdu.h>
 #include <yaz/z-core.h>
 #include <yaz/srw.h>
 #include <yaz/pquery.h>
+#include <yaz/oid_db.h>
 
 #include <boost/thread/mutex.hpp>
 
 #include <iostream>
 #include <sstream>
 #include <string>
-
+#include <algorithm>
+#include <map>
 
 namespace mp = metaproxy_1;
+namespace mp_util = metaproxy_1::util;
 namespace yf = mp::filter;
 
-namespace metaproxy_1 
-{
-
-    template<typename T>
-    std::string to_string(const T& t)
-    {
-        std::ostringstream o;
-        if(o << t)
-            return o.str();
-        
-        return std::string();
-    }
-
-    std::string http_header_value(const Z_HTTP_Header* header, 
-                                  const std::string name)
-    {
-        while (header && header->name
-               && std::string(header->name) !=  name)
-            header = header->next;
-        
-        if (header && header->name && std::string(header->name) == name
-            && header->value)
-            return std::string(header->value);
-
-        return std::string();
-    }
-    
-
-}
-
-
 namespace metaproxy_1 {
     namespace filter {
-        class SRUtoZ3950::Rep {
+        class SRUtoZ3950::Impl {
+        public:
+            void configure(const xmlNode *xmlnode);
+            void process(metaproxy_1::Package &package);
         private:
             union SRW_query {char * cql; char * xcql; char * pqf;};
             typedef const int& SRW_query_type;
-        public:
-            void configure(const xmlNode *xmlnode);
-            void process(metaproxy_1::Package &package) const;
+            std::map<std::string, const xmlNode *> m_database_explain;
         private:
-            std::string sru_protocol(const Z_HTTP_Request &http_req) const;
-            std::string debug_http(const Z_HTTP_Request &http_req) const;
-            void http_response(mp::Package &package, 
-                               const std::string &content, 
-                               int http_code = 200) const;
-            bool build_sru_debug_package(mp::Package &package) const;
-            bool build_sru_response(mp::Package &package, 
-                                    mp::odr &odr_en,
-                                    Z_SOAP *soap,
-                                    const Z_SRW_PDU *sru_pdu_res,
-                                    char *charset,
-                                    const char *stylesheet) const;
-            Z_SRW_PDU * decode_sru_request(mp::Package &package,   
-                                           mp::odr &odr_de,
-                                           mp::odr &odr_en,
-                                           Z_SRW_PDU *sru_pdu_res,
-                                           Z_SOAP *&soap,
-                                           char *charset,
-                                           char *stylesheet) const;
+
             bool z3950_build_query(mp::odr &odr_en, Z_Query *z_query, 
                                    const SRW_query &query, 
                                    SRW_query_type query_type) const;
+
             bool z3950_init_request(mp::Package &package, 
-                                         const std::string 
-                                         &database = "Default") const;
+                                    mp::odr &odr_en,
+                                    std::string zurl,
+                                    Z_SRW_PDU *sru_pdu_res) const;
+
             bool z3950_close_request(mp::Package &package) const;
-            bool z3950_search_request(mp::Package &package,
-                                      mp::odr &odr_en,
-                                      Z_SRW_PDU *sru_pdu_res,
-                                      Z_SRW_searchRetrieveRequest 
-                                          const *sr_req) const;
-            bool z3950_present_request(mp::Package &package,
-                                       mp::odr &odr_en,
-                                       Z_SRW_PDU *sru_pdu_res,
-                                       Z_SRW_searchRetrieveRequest 
-                                       const *sr_req) const;
+
+            bool z3950_search_request(
+                mp::Package &package,
+                mp::odr &odr_en,
+                Z_SRW_PDU *sru_pdu_res,
+                Z_SRW_searchRetrieveRequest const *sr_req,
+                std::string zurl) const;
+
+            bool z3950_present_request(
+                mp::Package &package,
+                mp::odr &odr_en,
+                Z_SRW_PDU *sru_pdu_res,
+                Z_SRW_searchRetrieveRequest const *sr_req) const;
+
             bool z3950_scan_request(mp::Package &package,
                                     mp::odr &odr_en,
                                     Z_SRW_PDU *sru_pdu_res,
                                     Z_SRW_scanRequest 
                                     const *sr_req) const;
-            Z_ElementSetNames * build_esn_from_schema(mp::odr &odr_en, const char *schema) const;
+
+            bool z3950_to_srw_diagnostics_ok(mp::odr &odr_en, 
+                                  Z_SRW_searchRetrieveResponse *srw_res,
+                                  Z_Records *records) const;
+
+            int z3950_to_srw_diag(mp::odr &odr_en, 
+                                  Z_SRW_searchRetrieveResponse *srw_res,
+                                  Z_DefaultDiagFormat *ddf) const;
         };
     }
 }
 
-yf::SRUtoZ3950::SRUtoZ3950() : m_p(new Rep)
+yf::SRUtoZ3950::SRUtoZ3950() : m_p(new Impl)
 {
 }
 
@@ -121,7 +103,7 @@ yf::SRUtoZ3950::~SRUtoZ3950()
 {  // must have a destructor because of boost::scoped_ptr
 }
 
-void yf::SRUtoZ3950::configure(const xmlNode *xmlnode)
+void yf::SRUtoZ3950::configure(const xmlNode *xmlnode, bool test_only)
 {
     m_p->configure(xmlnode);
 }
@@ -131,11 +113,38 @@ void yf::SRUtoZ3950::process(mp::Package &package) const
     m_p->process(package);
 }
 
-void yf::SRUtoZ3950::Rep::configure(const xmlNode *xmlnode)
+void yf::SRUtoZ3950::Impl::configure(const xmlNode *confignode)
 {
+    const xmlNode * dbnode;
+    
+    for (dbnode = confignode->children; dbnode; dbnode = dbnode->next){
+        if (dbnode->type != XML_ELEMENT_NODE)
+            continue;
+        
+        std::string database;
+        mp::xml::check_element_mp(dbnode, "database");
+
+        for (struct _xmlAttr *attr = dbnode->properties; 
+             attr; attr = attr->next){
+            
+            mp::xml::check_attribute(attr, "", "name");
+            database = mp::xml::get_text(attr);
+             
+            const xmlNode *explainnode;
+            for (explainnode = dbnode->children; 
+                 explainnode; explainnode = explainnode->next){
+                if (explainnode->type != XML_ELEMENT_NODE)
+                    continue;
+                if (explainnode)
+                    break;
+            }
+            // assigning explain node to database name - no check yet 
+            m_database_explain.insert(std::make_pair(database, explainnode));
+         }
+    }
 }
 
-void yf::SRUtoZ3950::Rep::process(mp::Package &package) const
+void yf::SRUtoZ3950::Impl::process(mp::Package &package)
 {
     Z_GDU *zgdu_req = package.request().get();
 
@@ -147,83 +156,125 @@ void yf::SRUtoZ3950::Rep::process(mp::Package &package) const
     
     // only working on  HTTP_Request packages now
 
-
-    // TODO: Z3950 response parsing and translation to SRU package
     bool ok = true;    
 
     mp::odr odr_de(ODR_DECODE);
     Z_SRW_PDU *sru_pdu_req = 0;
 
     mp::odr odr_en(ODR_ENCODE);
-    //Z_SRW_PDU *sru_pdu_res = 0;
     Z_SRW_PDU *sru_pdu_res = yaz_srw_get(odr_en, Z_SRW_explain_response);
 
+    // determine database with the HTTP header information only
+    mp_util::SRUServerInfo sruinfo = mp_util::get_sru_server_info(package);
+    std::map<std::string, const xmlNode *>::iterator idbexp;
+    idbexp = m_database_explain.find(sruinfo.database);
+
+    // assign explain config XML DOM node if database is known
+    const xmlNode *explainnode = 0;
+    if (idbexp != m_database_explain.end()){
+        explainnode = idbexp->second;
+    }
+    // just moving package if database is not known
+    else {
+        package.move();
+        return;
+    }
+    
+
+    // decode SRU request
     Z_SOAP *soap = 0;
     char *charset = 0;
     char *stylesheet = 0;
 
-    if (! (sru_pdu_req = decode_sru_request(package, odr_de, odr_en, 
-                                            sru_pdu_res, soap,
+    // filter acts as sink for non-valid SRU requests
+    if (! (sru_pdu_req = mp_util::decode_sru_request(package, odr_de, odr_en, 
+                                            sru_pdu_res, &soap,
                                             charset, stylesheet)))
     {
-        build_sru_response(package, odr_en, soap, 
-                           sru_pdu_res, charset, stylesheet);
+        if (soap)
+        {
+            mp_util::build_sru_explain(package, odr_en, sru_pdu_res, 
+                                       sruinfo, explainnode);
+            mp_util::build_sru_response(package, odr_en, soap, 
+                                        sru_pdu_res, charset, stylesheet);
+        }
+        else
+        {
+            metaproxy_1::odr odr; 
+            Z_GDU *zgdu_res = 
+                odr.create_HTTP_Response(package.session(), 
+                                         zgdu_req->u.HTTP_Request, 400);
+            package.response() = zgdu_res;
+        }
         return;
     }
     
-    
-    // SRU request package translation to Z3950 package
-    if (sru_pdu_req)
-        std::cout << *sru_pdu_req << "\n";
-    else
-        std::cout << "SRU empty\n";
-    
+    std::string zurl;
+    Z_SRW_extra_arg *arg;
 
-    // explain
+    for ( arg = sru_pdu_req->extra_args; arg; arg = arg->next)
+        if (!strcmp(arg->name, "x-target"))
+        {
+            zurl = std::string(arg->value);
+        }
+
+
+    // filter acts as sink for SRU explain requests
     if (sru_pdu_req && sru_pdu_req->which == Z_SRW_explain_request)
     {
-        //Z_SRW_searchRetrieveRequest *sr_req = sru_pdu_req->u.request;
-        // sru_pdu_res = yaz_srw_get(odr_en, Z_SRW_explain_response);
-        std::cout << "TODO: implement explain response";
-        
+        Z_SRW_explainRequest *er_req = sru_pdu_req->u.explain_request;
+        //mp_util::build_simple_explain(package, odr_en, sru_pdu_res, 
+        //                           sruinfo, er_req);
+        mp_util::build_sru_explain(package, odr_en, sru_pdu_res, 
+                                   sruinfo, explainnode, er_req);
     }
-    
-
-    // searchRetrieve
-    if (sru_pdu_req && sru_pdu_req->which == Z_SRW_searchRetrieve_request)
-    {
+    else if (sru_pdu_req 
+        && sru_pdu_req->which == Z_SRW_searchRetrieve_request
+        && sru_pdu_req->u.request)
+    {   // searchRetrieve
         Z_SRW_searchRetrieveRequest *sr_req = sru_pdu_req->u.request;   
         
         sru_pdu_res = yaz_srw_get(odr_en, Z_SRW_searchRetrieve_response);
 
-        if (z3950_init_request(package))
+        // checking that we have a query
+        ok = mp_util::check_sru_query_exists(package, odr_en, 
+                                             sru_pdu_res, sr_req);
+
+        if (ok && z3950_init_request(package, odr_en, zurl, sru_pdu_res))
         {
-            {
-                ok = z3950_search_request(package, odr_en,
-                                          sru_pdu_res, sr_req);
-
-                if (ok 
-                    && sru_pdu_res->u.response->numberOfRecords
-                    && *(sru_pdu_res->u.response->numberOfRecords)
-                    && sr_req->maximumRecords
-                    && *(sr_req->maximumRecords))
-                    
-                    ok = z3950_present_request(package, odr_en,
-                                               sru_pdu_res,
-                                               sr_req);
-                z3950_close_request(package);
-            }
+            ok = z3950_search_request(package, odr_en,
+                                      sru_pdu_res, sr_req, zurl);
+            
+            if (ok 
+                && sru_pdu_res->u.response->numberOfRecords
+                && *(sru_pdu_res->u.response->numberOfRecords)
+                && sr_req->maximumRecords
+                && *(sr_req->maximumRecords))
+                
+                ok = z3950_present_request(package, odr_en,
+                                           sru_pdu_res,
+                                           sr_req);
+            z3950_close_request(package);
         }
     }
 
     // scan
-    else if (sru_pdu_req && sru_pdu_req->which == Z_SRW_scan_request)
+    else if (sru_pdu_req 
+             && sru_pdu_req->which == Z_SRW_scan_request
+             && sru_pdu_req->u.scan_request)
     {
         Z_SRW_scanRequest  *sr_req = sru_pdu_req->u.scan_request;   
 
         sru_pdu_res = yaz_srw_get(odr_en, Z_SRW_scan_response);
         
-        if (z3950_init_request(package))
+        // we do not do scan at the moment, therefore issuing a diagnostic
+        yaz_add_srw_diagnostic(odr_en,
+                               &(sru_pdu_res->u.scan_response->diagnostics), 
+                               &(sru_pdu_res->u.scan_response->num_diagnostics), 
+                               YAZ_SRW_UNSUPP_OPERATION, "scan");
+ 
+        // to be used when we do scan
+        if (false && z3950_init_request(package, odr_en, zurl, sru_pdu_res))
         {
             z3950_scan_request(package, odr_en, sru_pdu_res, sr_req);    
             z3950_close_request(package);
@@ -231,176 +282,31 @@ void yf::SRUtoZ3950::Rep::process(mp::Package &package) const
     }
     else
     {
-        std::cout << "SRU OPERATION NOT SUPPORTED \n";
+        //std::cout << "SRU OPERATION NOT SUPPORTED \n";
         sru_pdu_res = yaz_srw_get(odr_en, Z_SRW_explain_response);
         
         // TODO: make nice diagnostic return package 
-        package.session().close();
         return;
     }
 
-    //build_sru_debug_package(package);
-    build_sru_response(package, odr_en, soap, 
-                       sru_pdu_res, charset, stylesheet);
-    return;
-
-
-
-
-
-
-
-}
-
-bool yf::SRUtoZ3950::Rep::build_sru_debug_package(mp::Package &package) const
-{
-    Z_GDU *zgdu_req = package.request().get();
-    if  (zgdu_req && zgdu_req->which == Z_GDU_HTTP_Request)
-    {    
-        Z_HTTP_Request* http_req =  zgdu_req->u.HTTP_Request;
-        std::string content = debug_http(*http_req);
-        int http_code = 400;    
-        http_response(package, content, http_code);
-        return true;
-    }
-    package.session().close();
-    return false;
+    // build and send SRU response
+    mp_util::build_sru_response(package, odr_en, soap, 
+                                sru_pdu_res, charset, stylesheet);
 }
 
 
-bool yf::SRUtoZ3950::Rep::build_sru_response(mp::Package &package, 
-                                             mp::odr &odr_en,
-                                             Z_SOAP *soap,
-                                             const Z_SRW_PDU *sru_pdu_res,
-                                             char *charset,
-                                             const char *stylesheet) 
-    const
-{
-
-    // SRU request package translation to Z3950 package
-    if (sru_pdu_res)
-        std::cout << *(const_cast<Z_SRW_PDU *>(sru_pdu_res)) << "\n";
-    else
-        std::cout << "SRU empty\n";
-
-    
-    Z_GDU *zgdu_req = package.request().get();
-    if  (zgdu_req && zgdu_req->which == Z_GDU_HTTP_Request)
-    {    
-        Z_GDU *zgdu_res //= z_get_HTTP_Response(odr_en, 200);
-            = odr_en.create_HTTP_Response(package.session(), 
-                                          zgdu_req->u.HTTP_Request, 
-                                          200);
-
-        // adding HTTP response code and headers
-        Z_HTTP_Response * http_res = zgdu_res->u.HTTP_Response;
-        //http_res->code = http_code;
-        
-        std::string ctype("text/xml");
-        if (charset){
-            ctype += "; charset=";
-            ctype += charset;
-        }
-
-        z_HTTP_header_add(odr_en, 
-                          &http_res->headers, "Content-Type", ctype.c_str());
-
-         // packaging Z_SOAP into HTML response
-         static Z_SOAP_Handler soap_handlers[4] = {
-              {"http://www.loc.gov/zing/srw/", 0,
-               (Z_SOAP_fun) yaz_srw_codec},
-              {"http://www.loc.gov/zing/srw/v1.0/", 0,
-               (Z_SOAP_fun) yaz_srw_codec},
-              {"http://www.loc.gov/zing/srw/update/", 0,
-               (Z_SOAP_fun) yaz_ucp_codec},
-              {0, 0, 0}
-          };
-
-
-         // empty stylesheet means NO stylesheet
-         if (stylesheet && *stylesheet == '\0')
-             stylesheet = 0;
-         
-         // encoding SRU package
-         
-         soap->u.generic->p  = (void*) sru_pdu_res;         
-         //int ret = 
-         z_soap_codec_enc_xsl(odr_en, &soap, 
-                              &http_res->content_buf, &http_res->content_len,
-                              soap_handlers, charset, stylesheet);
-         
-
-         package.response() = zgdu_res;
-         return true;
-    }
-    package.session().close();
-    return false;
-}
-
-
-
- Z_SRW_PDU * yf::SRUtoZ3950::Rep::decode_sru_request(mp::Package &package,
-                                                     mp::odr &odr_de,
-                                                     mp::odr &odr_en,
-                                                     Z_SRW_PDU *sru_pdu_res,
-                                                     Z_SOAP *&soap,
-                                                     char *charset,
-                                                     char *stylesheet) 
-     const
-{
-    Z_GDU *zgdu_req = package.request().get();
-    Z_SRW_PDU *sru_pdu_req = 0;
-
-    assert((zgdu_req->which == Z_GDU_HTTP_Request));
-    
-    //ignoring all non HTTP_Request packages
-    //if (!zgdu_req || !(zgdu_req->which == Z_GDU_HTTP_Request)){
-    //    return 0;
-    //}
-    
-    Z_HTTP_Request* http_req =  zgdu_req->u.HTTP_Request;
-    if (! http_req)
-        return 0;
-
-    //Z_SRW_PDU *sru_pdu_res_exp = yaz_srw_get(odr_en, Z_SRW_explain_response);
-    
-    if (0 == yaz_sru_decode(http_req, &sru_pdu_req, &soap, 
-                            odr_de, &charset, 
-                            &(sru_pdu_res->u.response->diagnostics), 
-                            &(sru_pdu_res->u.response->num_diagnostics)))
-    {
-        if (sru_pdu_res->u.response->num_diagnostics)
-        {
-            //sru_pdu_res = sru_pdu_res_exp;
-            package.session().close();
-            return 0;
-        }
-        return sru_pdu_req;
-    }
-    else if (0 == yaz_srw_decode(http_req, &sru_pdu_req, &soap, 
-                                 odr_de, &charset))
-        return sru_pdu_req;
-    else 
-    {
-        //sru_pdu_res = sru_pdu_res_exp;
-        package.session().close();
-        return 0;
-    }
-    return 0;
-}
 
 bool 
-yf::SRUtoZ3950::Rep::z3950_init_request(mp::Package &package, 
-                                             const std::string &database) const
+yf::SRUtoZ3950::Impl::z3950_init_request(mp::Package &package, 
+                                         mp::odr &odr_en,
+                                         std::string zurl,
+                                         Z_SRW_PDU *sru_pdu_res) const
 {
     // prepare Z3950 package
-    //Session s;
-    //Package z3950_package(s, package.origin());
     Package z3950_package(package.session(), package.origin());
     z3950_package.copy_filter(package);
 
     // set initRequest APDU
-    mp::odr odr_en(ODR_ENCODE);
     Z_APDU *apdu = zget_APDU(odr_en, Z_APDU_initRequest);
     Z_InitRequest *init_req = apdu->u.initRequest;
     //TODO: add user name in apdu
@@ -419,15 +325,25 @@ yf::SRUtoZ3950::Rep::z3950_init_request(mp::Package &package,
     ODR_MASK_SET(init_req->protocolVersion, Z_ProtocolVersion_2);
     ODR_MASK_SET(init_req->protocolVersion, Z_ProtocolVersion_3);
 
+    if (zurl.length())
+    {    
+        std::string host;
+        std::list<std::string> dblist;
+        mp_util::split_zurl(zurl, host, dblist);
+        mp_util::set_vhost_otherinfo(&init_req->otherInfo, odr_en, host, 1);
+    }
+
     z3950_package.request() = apdu;
 
     // send Z3950 package
-    // std::cout << "z3950_init_request " << *apdu <<"\n";
     z3950_package.move();
 
     // dead Z3950 backend detection
     if (z3950_package.session().is_closed()){
-        package.session().close();
+        yaz_add_srw_diagnostic(odr_en,
+                               &(sru_pdu_res->u.response->diagnostics),
+                               &(sru_pdu_res->u.response->num_diagnostics),
+                               YAZ_SRW_SYSTEM_TEMPORARILY_UNAVAILABLE, 0);
         return false;
     }
 
@@ -435,18 +351,20 @@ yf::SRUtoZ3950::Rep::z3950_init_request(mp::Package &package,
     Z_GDU *z3950_gdu = z3950_package.response().get();
 
     if (z3950_gdu && z3950_gdu->which == Z_GDU_Z3950 
-        && z3950_gdu->u.z3950->which == Z_APDU_initResponse)
+        && z3950_gdu->u.z3950->which == Z_APDU_initResponse 
+        && *z3950_gdu->u.z3950->u.initResponse->result)
          return true;
  
+    yaz_add_srw_diagnostic(odr_en,
+                           &(sru_pdu_res->u.response->diagnostics),
+                           &(sru_pdu_res->u.response->num_diagnostics),
+                           YAZ_SRW_SYSTEM_TEMPORARILY_UNAVAILABLE, 0);
     return false;
 }
 
 bool 
-yf::SRUtoZ3950::Rep::z3950_close_request(mp::Package &package) const
+yf::SRUtoZ3950::Impl::z3950_close_request(mp::Package &package) const
 {
-    // close SRU package
-    package.session().close();
-
     // prepare and close Z3950 package 
     Package z3950_package(package.session(), package.origin());
     z3950_package.copy_filter(package);
@@ -471,32 +389,39 @@ yf::SRUtoZ3950::Rep::z3950_close_request(mp::Package &package) const
     return false;
 }
 
-bool 
-yf::SRUtoZ3950::Rep::z3950_search_request(mp::Package &package,  
-                                          mp::odr &odr_en,
-                                          Z_SRW_PDU *sru_pdu_res,
-                                          Z_SRW_searchRetrieveRequest 
-                                          const *sr_req) const
+bool yf::SRUtoZ3950::Impl::z3950_search_request(mp::Package &package,  
+                                                mp::odr &odr_en,
+                                                Z_SRW_PDU *sru_pdu_res,
+                                                Z_SRW_searchRetrieveRequest 
+                                                const *sr_req,
+                                                std::string zurl) const
 {
+
+    assert(sru_pdu_res->u.response);
+
     Package z3950_package(package.session(), package.origin());
-    z3950_package.copy_filter(package); 
-    //mp::odr odr_en(ODR_ENCODE);
-    Z_APDU *apdu = zget_APDU(odr_en, Z_APDU_searchRequest);
+    z3950_package.copy_filter(package);
 
     //add stuff in z3950 apdu
+    Z_APDU *apdu = zget_APDU(odr_en, Z_APDU_searchRequest);
     Z_SearchRequest *z_searchRequest = apdu->u.searchRequest;
 
-    // z3950'fy database
-    z_searchRequest->num_databaseNames = 1;
-    z_searchRequest->databaseNames = (char**)
-        odr_malloc(odr_en, sizeof(char *));
-    if (sr_req->database)
-        z_searchRequest->databaseNames[0] 
-            = odr_strdup(odr_en, const_cast<char *>(sr_req->database));
-    else
-        z_searchRequest->databaseNames[0] 
-            = odr_strdup(odr_en, "Default");
 
+    if (!mp_util::set_databases_from_zurl(odr_en, zurl,
+                                     &z_searchRequest->num_databaseNames,
+                                         &z_searchRequest->databaseNames))
+    {
+        z_searchRequest->num_databaseNames = 1;
+        z_searchRequest->databaseNames = (char**)
+            odr_malloc(odr_en, sizeof(char *));
+
+        if (sr_req->database)
+            z_searchRequest->databaseNames[0] 
+                = odr_strdup(odr_en, const_cast<char *>(sr_req->database));
+        else
+            z_searchRequest->databaseNames[0] 
+            = odr_strdup(odr_en, "Default");
+    }
 
     // z3950'fy query
     Z_Query *z_query = (Z_Query *) odr_malloc(odr_en, sizeof(Z_Query));
@@ -506,74 +431,84 @@ yf::SRUtoZ3950::Rep::z3950_search_request(mp::Package &package,
                            (const SRW_query&)sr_req->query, 
                            sr_req->query_type))
     {    
-        //send_to_srw_client_error(7, "query");
+        yaz_add_srw_diagnostic(odr_en,
+                               &(sru_pdu_res->u.response->diagnostics), 
+                               &(sru_pdu_res->u.response->num_diagnostics), 
+                               7, "query");
         return false;
     }
 
     z3950_package.request() = apdu;
-    //std::cout << "z3950_search_request " << *apdu << "\n";
         
+    // send Z39.50 package off to backend
     z3950_package.move();
 
 
     Z_GDU *z3950_gdu = z3950_package.response().get();
-    //std::cout << "z3950_search_request " << *z3950_gdu << "\n";
 
     //TODO: check success condition
-
     //int yaz_diag_bib1_to_srw (int bib1_code);
     //int yaz_diag_srw_to_bib1(int srw_code);
     //Se kode i src/seshigh.c (srw_bend_search, srw_bend_init).
 
-    if (z3950_gdu && z3950_gdu->which == Z_GDU_Z3950 
-        && z3950_gdu->u.z3950->which == Z_APDU_searchResponse
-        && z3950_gdu->u.z3950->u.searchResponse->searchStatus)
+    if (!z3950_gdu || z3950_gdu->which != Z_GDU_Z3950 
+        || z3950_gdu->u.z3950->which != Z_APDU_searchResponse
+        || !z3950_gdu->u.z3950->u.searchResponse
+        || !z3950_gdu->u.z3950->u.searchResponse->searchStatus)
     {
+        yaz_add_srw_diagnostic(odr_en,
+                               &(sru_pdu_res->u.response->diagnostics),
+                               &(sru_pdu_res->u.response->num_diagnostics),
+                               2, 0);
+        return false;
+    }
+    
+    // everything fine, continuing
+    Z_SearchResponse *sr = z3950_gdu->u.z3950->u.searchResponse;
 
-        Z_SearchResponse *sr = z3950_gdu->u.z3950->u.searchResponse;
-        if (sr)
-        {
-            // srw'fy number of records
-            sru_pdu_res->u.response->numberOfRecords 
-                = (int *) odr_malloc(odr_en, sizeof(int *));
-            *(sru_pdu_res->u.response->numberOfRecords) = *(sr->resultCount);
-
-            // srw'fy nextRecordPosition
-            //sru_pdu_res->u.response->nextRecordPosition 
-            //    = (int *) odr_malloc(odr_en, sizeof(int *));
-            //*(sru_pdu_res->u.response->nextRecordPosition) = 1;
-
-        }
-
-        return true;
+    // checking non surrogate diagnostics in Z3950 search response package
+    if (!z3950_to_srw_diagnostics_ok(odr_en, sru_pdu_res->u.response, 
+                                     sr->records))
+    {
+        return false;
     }
+
+    // Finally, roll on and srw'fy number of records
+    sru_pdu_res->u.response->numberOfRecords 
+        = (int *) odr_malloc(odr_en, sizeof(int *));
+    *(sru_pdu_res->u.response->numberOfRecords) = *(sr->resultCount);
     
-    return false;
+    // srw'fy nextRecordPosition
+    //sru_pdu_res->u.response->nextRecordPosition 
+    //    = (int *) odr_malloc(odr_en, sizeof(int *));
+    //*(sru_pdu_res->u.response->nextRecordPosition) = 1;
+
+    return true;
 }
 
 bool 
-yf::SRUtoZ3950::Rep::z3950_present_request(mp::Package &package, 
-                                           mp::odr &odr_en,
-                                           Z_SRW_PDU *sru_pdu_res,
-                                           Z_SRW_searchRetrieveRequest 
-                                           const *sr_req)
+yf::SRUtoZ3950::Impl::z3950_present_request(mp::Package &package, 
+                                            mp::odr &odr_en,
+                                            Z_SRW_PDU *sru_pdu_res,
+                                            Z_SRW_searchRetrieveRequest 
+                                            const *sr_req)
     const
 {
+    assert(sru_pdu_res->u.response);
+    int start = 1;
+    int max_recs = 0;
 
     if (!sr_req)
         return false;
 
-    
-    // no need to work if nobody wants records seen ..
-    if (!(sr_req->maximumRecords) || 0 == *(sr_req->maximumRecords))
-        return true;
-
-    // creating Z3950 package
-    Package z3950_package(package.session(), package.origin());
-    z3950_package.copy_filter(package); 
-    Z_APDU *apdu = zget_APDU(odr_en, Z_APDU_presentRequest);
+    if (sr_req->maximumRecords)
+        max_recs = *sr_req->maximumRecords;
+    if (sr_req->startRecord)
+        start = *sr_req->startRecord;
 
-    assert(apdu->u.presentRequest);
+    // no need to work if nobody wants record ..
+    if (max_recs == 0)
+        return true;
 
     bool send_z3950_present = true;
 
@@ -584,7 +519,7 @@ yf::SRUtoZ3950::Rep::z3950_present_request(mp::Package &package,
         yaz_add_srw_diagnostic(odr_en,
                                &(sru_pdu_res->u.response->diagnostics), 
                                &(sru_pdu_res->u.response->num_diagnostics), 
-                               72, 0);
+                               YAZ_SRW_XPATH_RETRIEVAL_UNSUPP, 0);
     }
     
     // resultSetTTL unsupported.
@@ -595,7 +530,7 @@ yf::SRUtoZ3950::Rep::z3950_present_request(mp::Package &package,
         yaz_add_srw_diagnostic(odr_en,
                                &(sru_pdu_res->u.response->diagnostics), 
                                &(sru_pdu_res->u.response->num_diagnostics), 
-                               50, 0);
+                               YAZ_SRW_RESULT_SETS_UNSUPP, 0);
     }
     
     // sort unsupported
@@ -605,46 +540,72 @@ yf::SRUtoZ3950::Rep::z3950_present_request(mp::Package &package,
         yaz_add_srw_diagnostic(odr_en,
                                &(sru_pdu_res->u.response->diagnostics), 
                                &(sru_pdu_res->u.response->num_diagnostics), 
-                               80, 0);
+                               YAZ_SRW_SORT_UNSUPP, 0);
     }
     
+    // start record requested negative, or larger than number of records
+    if (start < 0 || start > *sru_pdu_res->u.response->numberOfRecords)
+    {
+        send_z3950_present = false;
+        yaz_add_srw_diagnostic(odr_en,
+                               &(sru_pdu_res->u.response->diagnostics), 
+                               &(sru_pdu_res->u.response->num_diagnostics), 
+                               YAZ_SRW_FIRST_RECORD_POSITION_OUT_OF_RANGE, 0);
+    }    
+    
+    // maximumRecords requested negative
+    if (max_recs < 0)
+    {
+        send_z3950_present = false;
+        yaz_add_srw_diagnostic(odr_en,
+                               &(sru_pdu_res->u.response->diagnostics), 
+                               &(sru_pdu_res->u.response->num_diagnostics), 
+                               YAZ_SRW_UNSUPP_PARAMETER_VALUE,
+                               "maximumRecords");
+    }    
+
     // exit on all these above diagnostics
     if (!send_z3950_present)
         return false;
 
     // now packaging the z3950 present request
+    Package z3950_package(package.session(), package.origin());
+    z3950_package.copy_filter(package); 
+    Z_APDU *apdu = zget_APDU(odr_en, Z_APDU_presentRequest);
+
+    assert(apdu->u.presentRequest);
 
     // z3950'fy start record position
-    if (sr_req->startRecord)
-        *(apdu->u.presentRequest->resultSetStartPoint) 
-            = *(sr_req->startRecord);
-    else 
-        *(apdu->u.presentRequest->resultSetStartPoint) = 1;
+    *apdu->u.presentRequest->resultSetStartPoint = start;
     
     // z3950'fy number of records requested 
-    if (sr_req->maximumRecords)
-        *(apdu->u.presentRequest->numberOfRecordsRequested) 
-            = *(sr_req->maximumRecords);
-     
+    // protect against requesting records out of range
+    *apdu->u.presentRequest->numberOfRecordsRequested
+        = std::min(max_recs, 
+                   *sru_pdu_res->u.response->numberOfRecords - start + 1);
+    
     // z3950'fy recordPacking
     int record_packing = Z_SRW_recordPacking_XML;
     if (sr_req->recordPacking && 's' == *(sr_req->recordPacking))
         record_packing = Z_SRW_recordPacking_string;
-
+    
     // RecordSyntax will always be XML
-    (apdu->u.presentRequest->preferredRecordSyntax)
-        = yaz_oidval_to_z3950oid (odr_en, CLASS_RECSYN, VAL_TEXT_XML);
+    apdu->u.presentRequest->preferredRecordSyntax
+        = odr_oiddup(odr_en, yaz_oid_recsyn_xml);
 
     // z3950'fy record schema
-     if (sr_req->recordSchema)
-     {
-         apdu->u.presentRequest->recordComposition 
-             = (Z_RecordComposition *) odr_malloc(odr_en, sizeof(Z_RecordComposition));
-         apdu->u.presentRequest->recordComposition->which 
-             = Z_RecordComp_simple;
-         apdu->u.presentRequest->recordComposition->u.simple 
-             = build_esn_from_schema(odr_en, (const char *) sr_req->recordSchema); 
-     }
+    if (sr_req->recordSchema)
+    {
+        apdu->u.presentRequest->recordComposition 
+            = (Z_RecordComposition *) 
+            odr_malloc(odr_en, sizeof(Z_RecordComposition));
+        apdu->u.presentRequest->recordComposition->which 
+            = Z_RecordComp_simple;
+        apdu->u.presentRequest->recordComposition->u.simple 
+            = mp_util::build_esn_from_schema(odr_en,
+                                             (const char *) 
+                                             sr_req->recordSchema); 
+    }
 
     // z3950'fy time to live - flagged as diagnostics above
     //if (sr_req->resultSetTTL)
@@ -652,99 +613,106 @@ yf::SRUtoZ3950::Rep::z3950_present_request(mp::Package &package,
     // attaching Z3950 package to filter chain
     z3950_package.request() = apdu;
 
-    //std::cout << "z3950_present_request " << *apdu << "\n";   
+    // sending Z30.50 present request 
     z3950_package.move();
 
-    //TODO: check success condition
+    //check successful Z3950 present response
     Z_GDU *z3950_gdu = z3950_package.response().get();
-    if (z3950_gdu && z3950_gdu->which == Z_GDU_Z3950 
-        && z3950_gdu->u.z3950->which == Z_APDU_presentResponse)
+    if (!z3950_gdu || z3950_gdu->which != Z_GDU_Z3950 
+        || z3950_gdu->u.z3950->which != Z_APDU_presentResponse
+        || !z3950_gdu->u.z3950->u.presentResponse)
 
     {
-        //std::cout << "z3950_present_request OK\n";
+        yaz_add_srw_diagnostic(odr_en,
+                               &(sru_pdu_res->u.response->diagnostics), 
+                               &(sru_pdu_res->u.response->num_diagnostics), 
+                               YAZ_SRW_SYSTEM_TEMPORARILY_UNAVAILABLE, 0);
+        return false;
+    }
 
-        Z_PresentResponse *pr = z3950_gdu->u.z3950->u.presentResponse;
-        if (pr)
+
+    // everything fine, continuing
+
+    Z_PresentResponse *pr = z3950_gdu->u.z3950->u.presentResponse;
+    Z_SRW_searchRetrieveResponse *sru_res = sru_pdu_res->u.response;
+        
+
+    // checking non surrogate diagnostics in Z3950 present response package
+    if (!z3950_to_srw_diagnostics_ok(odr_en, sru_pdu_res->u.response, 
+                                     pr->records))
+        return false;
+    
+
+    
+    // copy all records if existing
+    if (pr->records && pr->records->which == Z_Records_DBOSD)
+    {
+        // srw'fy number of returned records
+        sru_res->num_records
+            = pr->records->u.databaseOrSurDiagnostics->num_records;
+        
+        sru_res->records 
+            = (Z_SRW_record *) odr_malloc(odr_en, 
+                                          sru_res->num_records 
+                                             * sizeof(Z_SRW_record));
+        
+
+        // srw'fy nextRecordPosition
+        // next position never zero or behind the last z3950 record 
+        if (pr->nextResultSetPosition
+            && *(pr->nextResultSetPosition) > 0 
+            && *(pr->nextResultSetPosition) 
+               <= *(sru_pdu_res->u.response->numberOfRecords))
+            sru_res->nextRecordPosition 
+                = odr_intdup(odr_en, *(pr->nextResultSetPosition));
+        
+        // inserting all records
+        for (int i = 0; i < sru_res->num_records; i++)
         {
-            Z_SRW_searchRetrieveResponse *sru_res = sru_pdu_res->u.response;
+            int position = i + *apdu->u.presentRequest->resultSetStartPoint;
+            Z_NamePlusRecord *npr 
+                = pr->records->u.databaseOrSurDiagnostics->records[i];
             
-            // srw'fy nextRecordPosition
-            if (pr->nextResultSetPosition)
-                sru_res->nextRecordPosition 
-                    = odr_intdup(odr_en, *(pr->nextResultSetPosition));
+            sru_res->records[i].recordPacking = record_packing;
             
-            //    = (int *) odr_malloc(odr_en, sizeof(int *));
-            //*(sru_res->nextRecordPosition) 
-                                                     //= *(Pr->nextResultSetPosition);
-
-            // copy all records if existing
-            if (pr->records && pr->records->which == Z_Records_DBOSD)
+            if (npr->which == Z_NamePlusRecord_databaseRecord &&
+                npr->u.databaseRecord->direct_reference 
+                && !oid_oidcmp(npr->u.databaseRecord->direct_reference,
+                               yaz_oid_recsyn_xml))
             {
-                // srw'fy number of returned records
-                sru_res->num_records
-                    = pr->records->u.databaseOrSurDiagnostics->num_records;
-
-                sru_res->records 
-                    = (Z_SRW_record *) 
-                    odr_malloc(odr_en, 
-                               sru_res->num_records *sizeof(Z_SRW_record));
-
-                for (int i = 0; i < sru_res->num_records; i++)
-                {
-                    Z_NamePlusRecord *npr 
-                        = pr->records->u.databaseOrSurDiagnostics->records[i];
-
-                    sru_res->records[i].recordPosition 
-                        = odr_intdup(odr_en, i + *(apdu->u.presentRequest->resultSetStartPoint));
-
-                    sru_res->records[i].recordPacking = record_packing;
-
-                    if (npr->which != Z_NamePlusRecord_databaseRecord)
-                    {
-                        sru_res->records[i].recordSchema = "diagnostic";
-                        sru_res->records[i].recordData_buf = "67";
-                        sru_res->records[i].recordData_len = 2;
-                    }
-                    else
-                    {
-                        Z_External *r = npr->u.databaseRecord;
-                        oident *ent = oid_getentbyoid(r->direct_reference);
-                        if (r->which == Z_External_octet 
-                            && ent->value == VAL_TEXT_XML)
-                        {
-                            sru_res->records[i].recordSchema = "dc";
-                            sru_res->records[i].recordData_buf
-                                = odr_strdupn(odr_en, 
-                                              (const char *)r->u.octet_aligned->buf, 
-                                              r->u.octet_aligned->len);
-                            sru_res->records[i].recordData_len 
-                                = r->u.octet_aligned->len;
-                        }
-                        else
-                        {
-                            sru_res->records[i].recordSchema = "diagnostic";
-                            sru_res->records[i].recordData_buf = "67";
-                            sru_res->records[i].recordData_len = 2;
-                        }
-                    }
-                    
-                }
-                
-                
+                // got XML record back
+                Z_External *r = npr->u.databaseRecord;
+                sru_res->records[i].recordPosition = 
+                    odr_intdup(odr_en, position);
+                sru_res->records[i].recordSchema = sr_req->recordSchema;
+                sru_res->records[i].recordData_buf
+                    = odr_strdupn(odr_en, 
+                                  (const char *)r->u.octet_aligned->buf, 
+                                  r->u.octet_aligned->len);
+                sru_res->records[i].recordData_len 
+                    = r->u.octet_aligned->len;
+            }
+            else
+            {
+                // not XML or no database record at all
+                yaz_mk_sru_surrogate(
+                    odr_en, sru_res->records + i, position,
+                    YAZ_SRW_RECORD_NOT_AVAILABLE_IN_THIS_SCHEMA, 0);
             }
         }
-        return true;
     }
-
-    return false;
+    
+    return true;
 }
 
 bool 
-yf::SRUtoZ3950::Rep::z3950_scan_request(mp::Package &package,
+yf::SRUtoZ3950::Impl::z3950_scan_request(mp::Package &package,
                                         mp::odr &odr_en,
                                         Z_SRW_PDU *sru_pdu_res,
                                         Z_SRW_scanRequest const *sr_req) const 
 {
+    assert(sru_pdu_res->u.scan_response);
+
     Package z3950_package(package.session(), package.origin());
     z3950_package.copy_filter(package); 
     //mp::odr odr_en(ODR_ENCODE);
@@ -801,7 +769,7 @@ yf::SRUtoZ3950::Rep::z3950_scan_request(mp::Package &package,
     return false;
 }
 
-bool yf::SRUtoZ3950::Rep::z3950_build_query(mp::odr &odr_en, Z_Query *z_query, 
+bool yf::SRUtoZ3950::Impl::z3950_build_query(mp::odr &odr_en, Z_Query *z_query, 
                                             const SRW_query &query, 
                                             SRW_query_type query_type) const
 {        
@@ -844,104 +812,41 @@ bool yf::SRUtoZ3950::Rep::z3950_build_query(mp::odr &odr_en, Z_Query *z_query,
 }
 
 
-std::string 
-yf::SRUtoZ3950::Rep::sru_protocol(const Z_HTTP_Request &http_req) const
-{
-    const std::string mime_urlencoded("application/x-www-form-urlencoded");
-    const std::string mime_text_xml("text/xml");
-    const std::string mime_soap_xml("application/soap+xml");
-
-    const std::string http_method(http_req.method);
-    const std::string http_type 
-        =  http_header_value(http_req.headers, "Content-Type");
-
-    if (http_method == "GET")
-        return "SRU GET";
-
-    if (http_method == "POST"
-              && http_type  == mime_urlencoded)
-        return "SRU POST";
-    
-    if ( http_method == "POST"
-         && (http_type  == mime_text_xml
-             || http_type  == mime_soap_xml))
-        return "SRU SOAP";
-
-    return "HTTP";
-}
-
-std::string 
-yf::SRUtoZ3950::Rep::debug_http(const Z_HTTP_Request &http_req) const
+bool 
+yf::SRUtoZ3950::Impl::z3950_to_srw_diagnostics_ok(mp::odr &odr_en, 
+                                                  Z_SRW_searchRetrieveResponse 
+                                                  *sru_res,
+                                                  Z_Records *records) const
 {
-    std::string message("<html>\n<body>\n<h1>"
-                        "Metaproxy SRUtoZ3950 filter"
-                        "</h1>\n");
-    
-    message += "<h3>HTTP Info</h3><br/>\n";
-    message += "<p>\n";
-    message += "<b>Method: </b> " + std::string(http_req.method) + "<br/>\n";
-    message += "<b>Version:</b> " + std::string(http_req.version) + "<br/>\n";
-    message += "<b>Path:   </b> " + std::string(http_req.path) + "<br/>\n";
-
-    message += "<b>Content-Type:</b>"
-        + http_header_value(http_req.headers, "Content-Type")
-        + "<br/>\n";
-    message += "<b>Content-Length:</b>"
-        + http_header_value(http_req.headers, "Content-Length")
-        + "<br/>\n";
-    message += "</p>\n";    
-    
-    message += "<h3>Headers</h3><br/>\n";
-    message += "<p>\n";    
-    Z_HTTP_Header* header = http_req.headers;
-    while (header){
-        message += "<b>Header: </b> <i>" 
-            + std::string(header->name) + ":</i> "
-            + std::string(header->value) + "<br/>\n";
-        header = header->next;
+    // checking non surrogate diagnostics in Z3950 present response package
+    if (records 
+        && records->which == Z_Records_NSD
+        && records->u.nonSurrogateDiagnostic)
+    {
+        z3950_to_srw_diag(odr_en, sru_res, 
+                          records->u.nonSurrogateDiagnostic);
+        return false;
     }
-    message += "</p>\n";    
-    message += "</body>\n</html>\n";
-    return message;
+    return true;
 }
 
-void yf::SRUtoZ3950::Rep::http_response(metaproxy_1::Package &package, 
-                                        const std::string &content, 
-                                        int http_code) const
-{
 
-    Z_GDU *zgdu_req = package.request().get(); 
-    Z_GDU *zgdu_res = 0; 
-    mp::odr odr;
-    zgdu_res 
-       = odr.create_HTTP_Response(package.session(), 
-                                  zgdu_req->u.HTTP_Request, 
-                                  http_code);
-        
-    zgdu_res->u.HTTP_Response->content_len = content.size();
-    zgdu_res->u.HTTP_Response->content_buf 
-        = (char*) odr_malloc(odr, zgdu_res->u.HTTP_Response->content_len);
-    
-    strncpy(zgdu_res->u.HTTP_Response->content_buf, 
-            content.c_str(),  zgdu_res->u.HTTP_Response->content_len);
-    
-    //z_HTTP_header_add(odr, &hres->headers,
-    //                  "Content-Type", content_type.c_str());
-    package.response() = zgdu_res;
+int 
+yf::SRUtoZ3950::Impl::z3950_to_srw_diag(mp::odr &odr_en, 
+                                       Z_SRW_searchRetrieveResponse *sru_res,
+                                       Z_DefaultDiagFormat *ddf) const
+{
+    int bib1_code = *ddf->condition;
+    sru_res->num_diagnostics = 1;
+    sru_res->diagnostics = (Z_SRW_diagnostic *)
+        odr_malloc(odr_en, sizeof(*sru_res->diagnostics));
+    yaz_mk_std_diagnostic(odr_en, sru_res->diagnostics,
+                          yaz_diag_bib1_to_srw(bib1_code), 
+                          ddf->u.v2Addinfo);
+    return 0;
 }
 
 
-Z_ElementSetNames * yf::SRUtoZ3950::Rep::build_esn_from_schema(mp::odr &odr_en, const char *schema) const
-{
-  if (!schema)
-        return 0;
-  
-    Z_ElementSetNames *esn 
-        = (Z_ElementSetNames *) odr_malloc(odr_en, sizeof(Z_ElementSetNames));
-    esn->which = Z_ElementSetNames_generic;
-    esn->u.generic = odr_strdup(odr_en, schema);
-    return esn; 
-}
 
 static mp::filter::Base* filter_creator()
 {
@@ -951,7 +856,7 @@ static mp::filter::Base* filter_creator()
 extern "C" {
     struct metaproxy_1_filter_struct metaproxy_1_filter_sru_to_z3950 = {
         0,
-        "SRUtoZ3950",
+        "sru_z3950",
         filter_creator
     };
 }