Avoid session lock while client search is initiated
[pazpar2-moved-to-github.git] / src / session.c
index 373dd49..a48f69b 100644 (file)
@@ -95,6 +95,12 @@ struct client_list {
     struct client_list *next;
 };
 
+struct session_sorted_results {
+    const char *field;
+    int increasing;
+    struct session_sorted_results *next;
+};
+
 /* session counting (1) , disable client counting (0) */
 static YAZ_MUTEX g_session_mutex = 0;
 static int no_sessions = 0;
@@ -111,15 +117,17 @@ static int session_use(int delta)
         no_session_total += delta;
     sessions = no_sessions;
     yaz_mutex_leave(g_session_mutex);
-    yaz_log(YLOG_DEBUG, "%s sesions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), no_sessions);
+    yaz_log(YLOG_DEBUG, "%s sessions=%d", delta == 0 ? "" : (delta > 0 ? "INC" : "DEC"), no_sessions);
     return sessions;
 }
 
-int sessions_count(void) {
+int sessions_count(void)
+{
     return session_use(0);
 }
 
-int  session_count_total(void) {
+int session_count_total(void)
+{
     int total = 0;
     if (!g_session_mutex)
         return 0;
@@ -129,7 +137,6 @@ int  session_count_total(void) {
     return total;
 }
 
-
 static void log_xml_doc(xmlDoc *doc)
 {
     FILE *lf = yaz_log_file();
@@ -158,53 +165,50 @@ static void session_leave(struct session *s)
     yaz_mutex_leave(s->session_mutex);
 }
 
-// Recursively traverse query structure to extract terms.
-void pull_terms(NMEM nmem, struct ccl_rpn_node *n, char **termlist, int *num)
-{
-    char **words;
-    int numwords;
-    int i;
-
-    switch (n->kind)
-    {
-    case CCL_RPN_AND:
-    case CCL_RPN_OR:
-    case CCL_RPN_NOT:
-    case CCL_RPN_PROX:
-        pull_terms(nmem, n->u.p[0], termlist, num);
-        pull_terms(nmem, n->u.p[1], termlist, num);
-        break;
-    case CCL_RPN_TERM:
-        nmem_strsplit(nmem, " ", n->u.t.term, &words, &numwords);
-        for (i = 0; i < numwords; i++)
-            termlist[(*num)++] = words[i];
-        break;
-    default: // NOOP
-        break;
-    }
-}
-
-
 void add_facet(struct session *s, const char *type, const char *value, int count)
 {
     struct conf_service *service = s->service;
-    pp2_relevance_token_t prt;
+    pp2_charset_token_t prt;
     const char *facet_component;
     WRBUF facet_wrbuf = wrbuf_alloc();
-    prt = pp2_relevance_tokenize(service->facet_pct);
-    
-    pp2_relevance_first(prt, value, 0);
-    while ((facet_component = pp2_relevance_token_next(prt)))
+    WRBUF display_wrbuf = wrbuf_alloc();
+    int i;
+    const char *icu_chain_id = 0;
+
+    for (i = 0; i < service->num_metadata; i++)
+        if (!strcmp((service->metadata + i)->name, type))
+            icu_chain_id = (service->metadata + i)->facetrule;
+    if (!icu_chain_id)
+        icu_chain_id = "facet";
+    prt = pp2_charset_token_create(service->charsets, icu_chain_id);
+    if (!prt)
     {
+        yaz_log(YLOG_FATAL, "Unknown ICU chain '%s' for facet of type '%s'",
+                icu_chain_id, type);
+        wrbuf_destroy(facet_wrbuf);
+        wrbuf_destroy(display_wrbuf);
+        return;
+    }
+    pp2_charset_token_first(prt, value, 0);
+    while ((facet_component = pp2_charset_token_next(prt)))
+    {
+        const char *display_component;
         if (*facet_component)
         {
             if (wrbuf_len(facet_wrbuf))
                 wrbuf_puts(facet_wrbuf, " ");
             wrbuf_puts(facet_wrbuf, facet_component);
         }
+        display_component = pp2_get_display(prt);
+        if (display_component)
+        {
+            if (wrbuf_len(display_wrbuf))
+                wrbuf_puts(display_wrbuf, " ");
+            wrbuf_puts(display_wrbuf, display_component);
+        }
     }
-    pp2_relevance_token_destroy(prt);
-    
+    pp2_charset_token_destroy(prt);
     if (wrbuf_len(facet_wrbuf))
     {
         int i;
@@ -217,6 +221,7 @@ void add_facet(struct session *s, const char *type, const char *value, int count
             {
                 session_log(s, YLOG_FATAL, "Too many termlists");
                 wrbuf_destroy(facet_wrbuf);
+                wrbuf_destroy(display_wrbuf);
                 return;
             }
             
@@ -229,10 +234,11 @@ void add_facet(struct session *s, const char *type, const char *value, int count
 #if 0
         session_log(s, YLOG_DEBUG, "Facets for %s: %s norm:%s (%d)", type, value, wrbuf_cstr(facet_wrbuf), count);
 #endif
-        termlist_insert(s->termlists[i].termlist, wrbuf_cstr(facet_wrbuf),
-                        count);
+        termlist_insert(s->termlists[i].termlist, wrbuf_cstr(display_wrbuf),
+                        wrbuf_cstr(facet_wrbuf), count);
     }
     wrbuf_destroy(facet_wrbuf);
+    wrbuf_destroy(display_wrbuf);
 }
 
 static xmlDoc *record_to_xml(struct session *se,
@@ -246,13 +252,13 @@ static xmlDoc *record_to_xml(struct session *se,
     if (!rdoc)
     {
         session_log(se, YLOG_FATAL, "Non-wellformed XML received from %s",
-                    db->url);
+                    db->id);
         return 0;
     }
 
     if (global_parameters.dump_records)
     {
-        session_log(se, YLOG_LOG, "Un-normalized record from %s", db->url);
+        session_log(se, YLOG_LOG, "Un-normalized record from %s", db->id);
         log_xml_doc(rdoc);
     }
 
@@ -340,7 +346,7 @@ static xmlDoc *normalize_record(struct session *se,
         if (normalize_record_transform(sdb->map, &rdoc, (const char **)parms))
         {
             session_log(se, YLOG_WARN, "Normalize failed from %s",
-                        sdb->database->url);
+                        sdb->database->id);
         }
         else
         {
@@ -349,7 +355,7 @@ static xmlDoc *normalize_record(struct session *se,
             if (global_parameters.dump_records)
             {
                 session_log(se, YLOG_LOG, "Normalized record from %s", 
-                            sdb->database->url);
+                            sdb->database->id);
                 log_xml_doc(rdoc);
             }
         }
@@ -399,12 +405,8 @@ static int prepare_map(struct session *se, struct session_database *sdb)
 {
     const char *s;
 
-    if (!sdb->settings)
-    {
-        session_log(se, YLOG_WARN, "No settings on %s", sdb->database->url);
-        return -1;
-    }
-    if ((s = session_setting_oneval(sdb, PZ_XSLT)))
+    if (sdb->settings && sdb->settings[PZ_XSLT] && !sdb->map &&
+        (s = session_setting_oneval(sdb, PZ_XSLT)))        
     {
         char auto_stylesheet[256];
 
@@ -432,32 +434,13 @@ static int prepare_map(struct session *se, struct session_database *sdb)
             }
         }
         sdb->map = normalize_cache_get(se->normalize_cache,
-                                       se->service->server->config, s);
+                                       se->service, s);
         if (!sdb->map)
             return -1;
     }
     return 0;
 }
 
-// This analyzes settings and recomputes any supporting data structures
-// if necessary.
-static int prepare_session_database(struct session *se, 
-                                    struct session_database *sdb)
-{
-    if (!sdb->settings)
-    {
-        session_log(se, YLOG_WARN, 
-                "No settings associated with %s", sdb->database->url);
-        return -1;
-    }
-    if (sdb->settings[PZ_XSLT] && !sdb->map)
-    {
-        if (prepare_map(se, sdb) < 0)
-            return -1;
-    }
-    return 0;
-}
-
 // called if watch should be removed because http_channel is to be destroyed
 static void session_watch_cancel(void *data, struct http_channel *c,
                                  void *data2)
@@ -521,28 +504,63 @@ void session_alert_watch(struct session *s, int what)
 }
 
 //callback for grep_databases
-static void select_targets_callback(void *context, struct session_database *db)
+static void select_targets_callback(struct session *se,
+                                    struct session_database *db)
 {
-    struct session *se = (struct session*) context;
-    struct client *cl = client_create();
+    struct client *cl;
     struct client_list *l;
-    client_set_database(cl, db);
 
-    client_set_session(cl, se);
+    for (l = se->clients_cached; l; l = l->next)
+        if (client_get_database(l->client) == db)
+            break;
+
+    if (l)
+        cl = l->client;
+    else
+    {
+        cl = client_create(db->database->id);
+        client_set_database(cl, db);
+        client_set_session(cl, se);
+
+        l = xmalloc(sizeof(*l));
+        l->client = cl;
+        l->next = se->clients_cached;
+        se->clients_cached = l;
+    }
 
     l = xmalloc(sizeof(*l));
     l->client = cl;
-    l->next = se->clients;
-    se->clients = l;
+    l->next = se->clients_active;
+    se->clients_active = l;
+}
+
+static void session_reset_active_clients(struct session *se,
+                                         struct client_list *new_list)
+{
+    struct client_list *l;
+
+    session_enter(se);
+    l = se->clients_active;
+    se->clients_active = new_list;
+    session_leave(se);
+
+    while (l)
+    {
+        struct client_list *l_next = l->next;
+        xfree(l);
+        l = l_next;
+    }
 }
 
-static void session_remove_clients(struct session *se)
+static void session_remove_cached_clients(struct session *se)
 {
     struct client_list *l;
 
+    session_reset_active_clients(se, 0);
+
     session_enter(se);
-    l = se->clients;
-    se->clients = 0;
+    l = se->clients_cached;
+    se->clients_cached = 0;
     session_leave(se);
 
     while (l)
@@ -571,7 +589,7 @@ int session_active_clients(struct session *s)
     struct client_list *l;
     int res = 0;
 
-    for (l = s->clients; l; l = l->next)
+    for (l = s->clients_active; l; l = l->next)
         if (client_is_active(l->client))
             res++;
 
@@ -583,24 +601,96 @@ int session_is_preferred_clients_ready(struct session *s)
     struct client_list *l;
     int res = 0;
 
-    for (l = s->clients; l; l = l->next)
+    for (l = s->clients_active; l; l = l->next)
         if (client_is_active_preferred(l->client))
             res++;
     session_log(s, YLOG_DEBUG, "Has %d active preferred clients.", res);
     return res == 0;
 }
 
-enum pazpar2_error_code search(struct session *se,
-                               const char *query,
-                               const char *startrecs, const char *maxrecs,
-                               const char *filter,
-                               const char *limit,
-                               const char **addinfo)
+static const char *get_strategy_plus_sort(struct client *l, const char *field)
+{
+    struct session_database *sdb = client_get_database(l);
+    struct setting *s;
+
+    const char *strategy_plus_sort = 0;
+    
+    for (s = sdb->settings[PZ_SORTMAP]; s; s = s->next)
+    {
+        char *p = strchr(s->name + 3, ':');
+        if (!p)
+        {
+            yaz_log(YLOG_WARN, "Malformed sortmap name: %s", s->name);
+            continue;
+        }
+        p++;
+        if (!strcmp(p, field))
+        {
+            strategy_plus_sort = s->value;
+            break;
+        }
+    }
+    return strategy_plus_sort;
+}
+
+void session_sort(struct session *se, const char *field, int increasing)
+{
+    struct session_sorted_results *sr;
+    struct client_list *l;
+
+    session_enter(se);
+
+    /* see if we already have sorted for this critieria */
+    for (sr = se->sorted_results; sr; sr = sr->next)
+    {
+        if (!strcmp(field, sr->field) && increasing == sr->increasing)
+            break;
+    }
+    if (sr)
+    {
+        yaz_log(YLOG_LOG, "search_sort: field=%s increasing=%d already fetched",
+                field, increasing);
+        session_leave(se);
+        return;
+    }
+    yaz_log(YLOG_LOG, "search_sort: field=%s increasing=%d must fetch",
+            field, increasing);
+    sr = nmem_malloc(se->nmem, sizeof(*sr));
+    sr->field = nmem_strdup(se->nmem, field);
+    sr->increasing = increasing;
+    sr->next = se->sorted_results;
+    se->sorted_results = sr;
+    
+    for (l = se->clients_active; l; l = l->next)
+    {
+        struct client *cl = l->client;
+        const char *strategy_plus_sort = get_strategy_plus_sort(cl, field);
+        if (strategy_plus_sort)
+        {
+            struct timeval tval;
+            if (client_prep_connection(cl, se->service->z3950_operation_timeout,
+                                       se->service->z3950_session_timeout,
+                                       se->service->server->iochan_man,
+                                       &tval))
+                client_start_search(cl, strategy_plus_sort, increasing);
+        }
+    }
+    session_leave(se);
+}
+
+enum pazpar2_error_code session_search(struct session *se,
+                                       const char *query,
+                                       const char *startrecs,
+                                       const char *maxrecs,
+                                       const char *filter,
+                                       const char *limit,
+                                       const char **addinfo,
+                                       const char *sort_field, int increasing)
 {
     int live_channels = 0;
     int no_working = 0;
     int no_failed = 0;
-    struct client_list *l;
+    struct client_list *l, *l0;
     struct timeval tval;
     facet_limits_t facet_limits;
 
@@ -608,15 +698,26 @@ enum pazpar2_error_code search(struct session *se,
 
     *addinfo = 0;
 
-    session_remove_clients(se);
+    if (se->settings_modified)
+        session_remove_cached_clients(se);
+    else
+        session_reset_active_clients(se, 0);
     
     session_enter(se);
     reclist_destroy(se->reclist);
     se->reclist = 0;
+    se->settings_modified = 0;
     relevance_destroy(&se->relevance);
     nmem_reset(se->nmem);
-    se->total_records = se->total_hits = se->total_merged = 0;
+    se->total_records = se->total_merged = 0;
     se->num_termlists = 0;
+
+    /* reset list of sorted results and clear to relevance search */
+    se->sorted_results = nmem_malloc(se->nmem, sizeof(*se->sorted_results));
+    se->sorted_results->field = nmem_strdup(se->nmem, sort_field);
+    se->sorted_results->increasing = increasing;
+    se->sorted_results->next = 0;
+    
     live_channels = select_targets(se, filter);
     if (!live_channels)
     {
@@ -636,30 +737,50 @@ enum pazpar2_error_code search(struct session *se,
         session_leave(se);
         return PAZPAR2_MALFORMED_PARAMETER_VALUE;
     }
-    for (l = se->clients; l; l = l->next)
+
+    l0 = se->clients_active;
+    se->clients_active = 0;
+    session_leave(se);
+
+    for (l = l0; l; l = l->next)
     {
+        int parse_ret;
         struct client *cl = l->client;
+        const char *strategy_plus_sort = get_strategy_plus_sort(cl, sort_field);
+
+        if (prepare_map(se, client_get_database(cl)) < 0)
+            continue;
 
-        if (maxrecs)
-            client_set_maxrecs(cl, atoi(maxrecs));
-        if (startrecs)
-            client_set_startrecs(cl, atoi(startrecs));
-        if (prepare_session_database(se, client_get_database(cl)) < 0)
-            ;
-        else if (client_parse_query(cl, query, facet_limits) < 0)
+        parse_ret = client_parse_query(cl, query, facet_limits, startrecs,
+            maxrecs);
+        if (parse_ret < 0)
             no_failed++;
+        else if (parse_ret == 0)
+        {
+            session_log(se, YLOG_LOG, "client NEW %s", client_get_id(cl));
+            no_working++;
+            if (client_prep_connection(cl, se->service->z3950_operation_timeout,
+                                       se->service->z3950_session_timeout,
+                                       se->service->server->iochan_man,
+                                       &tval))
+                client_start_search(cl, strategy_plus_sort, increasing);
+        }
         else
         {
+            session_log(se, YLOG_LOG, "client REUSE %s", client_get_id(cl));
             no_working++;
             if (client_prep_connection(cl, se->service->z3950_operation_timeout,
                                        se->service->z3950_session_timeout,
                                        se->service->server->iochan_man,
                                        &tval))
-                client_start_search(cl);
+            {
+                client_reingest(cl);
+            }
         }
     }
     facet_limits_destroy(facet_limits);
-    session_leave(se);
+    session_reset_active_clients(se, l0);
+
     if (no_working == 0)
     {
         if (no_failed > 0)
@@ -670,6 +791,7 @@ enum pazpar2_error_code search(struct session *se,
         else
             return PAZPAR2_NO_TARGETS;
     }
+    yaz_log(YLOG_LOG, "session_start_search done");
     return PAZPAR2_NO_ERROR;
 }
 
@@ -717,8 +839,6 @@ static struct session_database *load_session_database(struct session *se,
 {
     struct database *db = new_database(id, se->session_nmem);
 
-    resolve_database(se->service, db);
-
     session_init_databases_fun((void*) se, db);
 
     // New sdb is head of se->databases list
@@ -732,7 +852,7 @@ static struct session_database *find_session_database(struct session *se,
     struct session_database *sdb;
 
     for (sdb = se->databases; sdb; sdb = sdb->next)
-        if (!strcmp(sdb->database->url, id))
+        if (!strcmp(sdb->database->id, id))
             return sdb;
     return load_session_database(se, id);
 }
@@ -755,6 +875,8 @@ void session_apply_setting(struct session *se, char *dbname, char *setting,
     new->next = sdb->settings[offset];
     sdb->settings[offset] = new;
 
+    se->settings_modified = 1;
+
     // Force later recompute of settings-driven data structures
     // (happens when a search starts and client connections are prepared)
     switch (offset)
@@ -768,11 +890,12 @@ void session_apply_setting(struct session *se, char *dbname, char *setting,
     }
 }
 
-void session_destroy(struct session *se) {
+void session_destroy(struct session *se)
+{
     struct session_database *sdb;
     session_log(se, YLOG_DEBUG, "Destroying");
     session_use(-1);
-    session_remove_clients(se);
+    session_remove_cached_clients(se);
 
     for (sdb = se->databases; sdb; sdb = sdb->next)
         session_database_destroy(sdb);
@@ -782,13 +905,6 @@ void session_destroy(struct session *se) {
     nmem_destroy(se->nmem);
     service_destroy(se->service);
     yaz_mutex_destroy(&se->session_mutex);
-    wrbuf_destroy(se->wrbuf);
-}
-
-/* Depreciated: use session_destroy */
-void destroy_session(struct session *se)
-{
-    session_destroy(se);
 }
 
 size_t session_get_memory_status(struct session *session) {
@@ -816,16 +932,16 @@ struct session *new_session(NMEM nmem, struct conf_service *service,
     session_log(session, YLOG_DEBUG, "New");
     session->service = service;
     session->relevance = 0;
-    session->total_hits = 0;
     session->total_records = 0;
     session->number_of_warnings_unknown_elements = 0;
     session->number_of_warnings_unknown_metadata = 0;
     session->num_termlists = 0;
     session->reclist = 0;
-    session->clients = 0;
+    session->clients_active = 0;
+    session->clients_cached = 0;
+    session->settings_modified = 0;
     session->session_nmem = nmem;
     session->nmem = nmem_create();
-    session->wrbuf = wrbuf_alloc();
     session->databases = 0;
     for (i = 0; i <= SESSION_WATCH_MAX; i++)
     {
@@ -839,26 +955,28 @@ struct session *new_session(NMEM nmem, struct conf_service *service,
     return session;
 }
 
-struct hitsbytarget *hitsbytarget(struct session *se, int *count, NMEM nmem)
+const char * client_get_suggestions_xml(struct client *cl, WRBUF wrbuf);
+
+static struct hitsbytarget *hitsbytarget_nb(struct session *se,
+                                            int *count, NMEM nmem)
 {
     struct hitsbytarget *res = 0;
     struct client_list *l;
     size_t sz = 0;
 
-    session_enter(se);
-    for (l = se->clients; l; l = l->next)
+    for (l = se->clients_active; l; l = l->next)
         sz++;
 
     res = nmem_malloc(nmem, sizeof(*res) * sz);
     *count = 0;
-    for (l = se->clients; l; l = l->next)
+    for (l = se->clients_active; l; l = l->next)
     {
         struct client *cl = l->client;
         WRBUF w = wrbuf_alloc();
         const char *name = session_setting_oneval(client_get_database(cl),
                                                   PZ_NAME);
 
-        res[*count].id = client_get_database(cl)->database->url;
+        res[*count].id = client_get_id(cl);
         res[*count].name = *name ? name : "Unknown";
         res[*count].hits = client_get_hits(cl);
         res[*count].records = client_get_num_records(cl);
@@ -867,13 +985,24 @@ struct hitsbytarget *hitsbytarget(struct session *se, int *count, NMEM nmem)
         res[*count].connected  = client_get_connection(cl) ? 1 : 0;
         session_settings_dump(se, client_get_database(cl), w);
         res[*count].settings_xml = nmem_strdup(nmem, wrbuf_cstr(w));
+        wrbuf_rewind(w);
+        wrbuf_puts(w, "");
+        res[*count].suggestions_xml = nmem_strdup(nmem, client_get_suggestions_xml(cl, w));
         wrbuf_destroy(w);
         (*count)++;
     }
-    session_leave(se);
     return res;
 }
 
+struct hitsbytarget *get_hitsbytarget(struct session *se, int *count, NMEM nmem)
+{
+    struct hitsbytarget *p;
+    session_enter(se);
+    p = hitsbytarget_nb(se, count, nmem);
+    session_leave(se);
+    return p;
+}
+    
 struct termlist_score **get_termlist_score(struct session *se,
                                            const char *name, int *num)
 {
@@ -891,6 +1020,116 @@ struct termlist_score **get_termlist_score(struct session *se,
     return tl;
 }
 
+// Compares two hitsbytarget nodes by hitcount
+static int cmp_ht(const void *p1, const void *p2)
+{
+    const struct hitsbytarget *h1 = p1;
+    const struct hitsbytarget *h2 = p2;
+    return h2->hits - h1->hits;
+}
+
+static int targets_termlist_nb(WRBUF wrbuf, struct session *se, int num,
+                               NMEM nmem)
+{
+    struct hitsbytarget *ht;
+    int count, i;
+
+    ht = hitsbytarget_nb(se, &count, nmem);
+    qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
+    for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
+    {
+
+        // do only print terms which have display names
+    
+        wrbuf_puts(wrbuf, "<term>\n");
+
+        wrbuf_puts(wrbuf, "<id>");
+        wrbuf_xmlputs(wrbuf, ht[i].id);
+        wrbuf_puts(wrbuf, "</id>\n");
+        
+        wrbuf_puts(wrbuf, "<name>");
+        if (!ht[i].name || !ht[i].name[0])
+            wrbuf_xmlputs(wrbuf, "NO TARGET NAME");
+        else
+            wrbuf_xmlputs(wrbuf, ht[i].name);
+        wrbuf_puts(wrbuf, "</name>\n");
+        
+        wrbuf_printf(wrbuf, "<frequency>" ODR_INT_PRINTF "</frequency>\n",
+                     ht[i].hits);
+        
+        wrbuf_puts(wrbuf, "<state>");
+        wrbuf_xmlputs(wrbuf, ht[i].state);
+        wrbuf_puts(wrbuf, "</state>\n");
+        
+        wrbuf_printf(wrbuf, "<diagnostic>%d</diagnostic>\n", 
+                     ht[i].diagnostic);
+        wrbuf_puts(wrbuf, "</term>\n");
+    }
+    return count;
+}
+
+void perform_termlist(struct http_channel *c, struct session *se,
+                      const char *name, int num)
+{
+    int i, j;
+    NMEM nmem_tmp = nmem_create();
+    char **names;
+    int num_names = 0;
+
+    if (name)
+        nmem_strsplit(nmem_tmp, ",", name, &names, &num_names);
+
+    session_enter(se);
+
+    for (j = 0; j < num_names; j++)
+    {
+        const char *tname;
+        
+        wrbuf_puts(c->wrbuf, "<list name=\"");
+        wrbuf_xmlputs(c->wrbuf, names[j]);
+        wrbuf_puts(c->wrbuf, "\">\n");
+
+        for (i = 0; i < se->num_termlists; i++)
+        {
+            tname = se->termlists[i].name;
+            if (num_names > 0 && !strcmp(names[j], tname))
+            {
+                struct termlist_score **p = 0;
+                int len;
+                p = termlist_highscore(se->termlists[i].termlist, &len);
+                if (p)
+                {
+                    int i;
+                    for (i = 0; i < len && i < num; i++)
+                    {
+                        // prevent sending empty term elements
+                        if (!p[i]->display_term || !p[i]->display_term[0])
+                            continue;
+                        
+                        wrbuf_puts(c->wrbuf, "<term>");
+                        wrbuf_puts(c->wrbuf, "<name>");
+                        wrbuf_xmlputs(c->wrbuf, p[i]->display_term);
+                        wrbuf_puts(c->wrbuf, "</name>");
+                        
+                        wrbuf_printf(c->wrbuf, 
+                                     "<frequency>%d</frequency>", 
+                                     p[i]->frequency);
+                        wrbuf_puts(c->wrbuf, "</term>\n");
+                    }
+                }
+            }
+        }
+        tname = "xtargets";
+        if (num_names > 0 && !strcmp(names[j], tname))
+        {
+            targets_termlist_nb(c->wrbuf, se, num, c->nmem);
+        }
+        wrbuf_puts(c->wrbuf, "</list>\n");
+    }
+    session_leave(se);
+    nmem_destroy(nmem_tmp);
+}
+
 #ifdef MISSING_HEADERS
 void report_nmem_stats(void)
 {
@@ -958,6 +1197,8 @@ struct record_cluster **show_range_start(struct session *se,
     }
     else
     {
+        struct client_list *l;
+        
         for (spp = sp; spp; spp = spp->next)
             if (spp->type == Metadata_sortkey_relevance)
             {
@@ -968,7 +1209,10 @@ struct record_cluster **show_range_start(struct session *se,
         
         reclist_enter(se->reclist);
         *total = reclist_get_num_records(se->reclist);
-        *sumhits = se->total_hits;
+
+        *sumhits = 0;
+        for (l = se->clients_active; l; l = l->next)
+            *sumhits += client_get_hits(l->client);
         
         for (i = 0; i < start; i++)
             if (!reclist_read_record(se->reclist))
@@ -1011,11 +1255,13 @@ void statistics(struct session *se, struct statistics *stat)
     int count = 0;
 
     memset(stat, 0, sizeof(*stat));
-    for (l = se->clients; l; l = l->next)
+    stat->num_hits = 0;
+    for (l = se->clients_active; l; l = l->next)
     {
         struct client *cl = l->client;
         if (!client_get_connection(cl))
             stat->num_no_connection++;
+        stat->num_hits += client_get_hits(cl);
         switch (client_get_state(cl))
         {
         case Client_Connecting: stat->num_connecting++; break;
@@ -1027,7 +1273,6 @@ void statistics(struct session *se, struct statistics *stat)
         }
         count++;
     }
-    stat->num_hits = se->total_hits;
     stat->num_records = se->total_records;
 
     stat->num_clients = count;
@@ -1107,15 +1352,15 @@ static int get_mergekey_from_doc(xmlDoc *doc, xmlNode *root, const char *name,
                 if (value)
                 {
                     const char *norm_str;
-                    pp2_relevance_token_t prt =
-                        pp2_relevance_tokenize(service->mergekey_pct);
+                    pp2_charset_token_t prt =
+                        pp2_charset_token_create(service->charsets, "mergekey");
                     
-                    pp2_relevance_first(prt, (const char *) value, 0);
+                    pp2_charset_token_first(prt, (const char *) value, 0);
                     if (wrbuf_len(norm_wr) > 0)
                         wrbuf_puts(norm_wr, " ");
                     wrbuf_puts(norm_wr, name);
                     while ((norm_str =
-                            pp2_relevance_token_next(prt)))
+                            pp2_charset_token_next(prt)))
                     {
                         if (*norm_str)
                         {
@@ -1124,7 +1369,7 @@ static int get_mergekey_from_doc(xmlDoc *doc, xmlNode *root, const char *name,
                         }
                     }
                     xmlFree(value);
-                    pp2_relevance_token_destroy(prt);
+                    pp2_charset_token_destroy(prt);
                     no_found++;
                 }
             }
@@ -1146,11 +1391,11 @@ static const char *get_mergekey(xmlDoc *doc, struct client *cl, int record_no,
     if (mergekey)
     {
         const char *norm_str;
-        pp2_relevance_token_t prt =
-            pp2_relevance_tokenize(service->mergekey_pct);
+        pp2_charset_token_t prt =
+            pp2_charset_token_create(service->charsets, "mergekey");
 
-        pp2_relevance_first(prt, (const char *) mergekey, 0);
-        while ((norm_str = pp2_relevance_token_next(prt)))
+        pp2_charset_token_first(prt, (const char *) mergekey, 0);
+        while ((norm_str = pp2_charset_token_next(prt)))
         {
             if (*norm_str)
             {
@@ -1159,7 +1404,7 @@ static const char *get_mergekey(xmlDoc *doc, struct client *cl, int record_no,
                 wrbuf_puts(norm_wr, norm_str);
             }
         }
-        pp2_relevance_token_destroy(prt);
+        pp2_charset_token_destroy(prt);
         xmlFree(mergekey);
     }
     else
@@ -1187,8 +1432,13 @@ static const char *get_mergekey(xmlDoc *doc, struct client *cl, int record_no,
     /* generate unique key if none is not generated already or is empty */
     if (wrbuf_len(norm_wr) == 0)
     {
-        wrbuf_printf(norm_wr, "%s-%d",
-                     client_get_database(cl)->database->url, record_no);
+        wrbuf_printf(norm_wr, "position: %s-%d",
+                     client_get_id(cl), record_no);
+    }
+    else
+    {
+        const char *lead = "content: ";
+        wrbuf_insert(norm_wr, 0, lead, strlen(lead));
     }
     if (wrbuf_len(norm_wr) > 0)
         mergekey_norm = nmem_strdup(nmem, wrbuf_cstr(norm_wr));
@@ -1292,7 +1542,7 @@ int ingest_record(struct client *cl, const char *rec,
     if (!check_record_filter(root, sdb))
     {
         session_log(se, YLOG_LOG, "Filtered out record no %d from %s",
-                    record_no, sdb->database->url);
+                    record_no, sdb->database->id);
         xmlFreeDoc(xdoc);
         return -2;
     }
@@ -1306,7 +1556,7 @@ int ingest_record(struct client *cl, const char *rec,
     }
     session_enter(se);
     if (client_get_session(cl) == se)
-        ret = ingest_to_cluster(cl, xdoc, root, record_no, mergekey_norm);
+        ingest_to_cluster(cl, xdoc, root, record_no, mergekey_norm);
     session_leave(se);
     
     xmlFreeDoc(xdoc);
@@ -1322,43 +1572,18 @@ static int ingest_to_cluster(struct client *cl,
     xmlNode *n;
     xmlChar *type = 0;
     xmlChar *value = 0;
-    struct session_database *sdb = client_get_database(cl);
     struct session *se = client_get_session(cl);
     struct conf_service *service = se->service;
+    int term_factor = 1;
+    struct record_cluster *cluster;
+    struct session_database *sdb = client_get_database(cl);
     struct record *record = record_create(se->nmem, 
                                           service->num_metadata,
                                           service->num_sortkeys, cl,
                                           record_no);
-    struct record_cluster *cluster = reclist_insert(se->reclist,
-                                                    service, 
-                                                    record,
-                                                    mergekey_norm,
-                                                    &se->total_merged);
-
-    const char *use_term_factor_str = session_setting_oneval(sdb, PZ_TERMLIST_TERM_FACTOR);
-    int use_term_factor = 0;
-    int term_factor = 1; 
-    if (use_term_factor_str && use_term_factor_str[0] != 0)
-       use_term_factor =  atoi(use_term_factor_str);
-    if (use_term_factor) {
-        int maxrecs = client_get_maxrecs(cl);
-        int hits = (int) client_get_hits(cl);
-        term_factor = MAX(hits, maxrecs) /  MAX(1, maxrecs);
-        assert(term_factor >= 1);
-        yaz_log(YLOG_DEBUG, "Using term factor: %d (%d / %d)", term_factor, MAX(hits, maxrecs), MAX(1, maxrecs));
-    }
 
-    if (!cluster)
-        return -1;
-    if (global_parameters.dump_records)
-        session_log(se, YLOG_LOG, "Cluster id %s from %s (#%d)", cluster->recid,
-                    sdb->database->url, record_no);
-    relevance_newrec(se->relevance, cluster);
-    
-    // now parsing XML record and adding data to cluster or record metadata
     for (n = root->children; n; n = n->next)
     {
-        pp2_relevance_token_t prt;
         if (type)
             xmlFree(type);
         if (value)
@@ -1370,11 +1595,9 @@ static int ingest_to_cluster(struct client *cl,
         if (!strcmp((const char *) n->name, "metadata"))
         {
             struct conf_metadata *ser_md = 0;
-            struct conf_sortkey *ser_sk = 0;
             struct record_metadata **wheretoput = 0;
             struct record_metadata *rec_md = 0;
             int md_field_id = -1;
-            int sk_field_id = -1;
             
             type = xmlGetProp(n, (xmlChar *) "type");
             value = xmlNodeListGetString(xdoc, n->children, 1);
@@ -1394,13 +1617,8 @@ static int ingest_to_cluster(struct client *cl,
                 se->number_of_warnings_unknown_metadata++;
                 continue;
             }
-            
+           
             ser_md = &service->metadata[md_field_id];
-            
-            if (ser_md->sortkey_offset >= 0){
-                sk_field_id = ser_md->sortkey_offset;
-                ser_sk = &service->sortkeys[sk_field_id];
-            }
 
             // non-merged metadata
             rec_md = record_metadata_init(se->nmem, (const char *) value,
@@ -1415,26 +1633,95 @@ static int ingest_to_cluster(struct client *cl,
             while (*wheretoput)
                 wheretoput = &(*wheretoput)->next;
             *wheretoput = rec_md;
+        }
+    }
+
+    cluster = reclist_insert(se->reclist, service, record,
+                             mergekey_norm, &se->total_merged);
+    if (!cluster)
+        return -1;
+
+    {
+        const char *use_term_factor_str =
+            session_setting_oneval(sdb, PZ_TERMLIST_TERM_FACTOR);
+        if (use_term_factor_str && use_term_factor_str[0] == '1')
+        {
+            int maxrecs = client_get_maxrecs(cl);
+            int hits = (int) client_get_hits(cl);
+            term_factor = MAX(hits, maxrecs) /  MAX(1, maxrecs);
+            assert(term_factor >= 1);
+            yaz_log(YLOG_DEBUG, "Using term factor: %d (%d / %d)", term_factor, MAX(hits, maxrecs), MAX(1, maxrecs));
+        }
+    }
+
+    if (global_parameters.dump_records)
+        session_log(se, YLOG_LOG, "Cluster id %s from %s (#%d)", cluster->recid,
+                    sdb->database->id, record_no);
+
+
+    relevance_newrec(se->relevance, cluster);
+    
+    // now parsing XML record and adding data to cluster or record metadata
+    for (n = root->children; n; n = n->next)
+    {
+        pp2_charset_token_t prt;
+        if (type)
+            xmlFree(type);
+        if (value)
+            xmlFree(value);
+        type = value = 0;
+        
+        if (n->type != XML_ELEMENT_NODE)
+            continue;
+        if (!strcmp((const char *) n->name, "metadata"))
+        {
+            struct conf_metadata *ser_md = 0;
+            struct conf_sortkey *ser_sk = 0;
+            struct record_metadata **wheretoput = 0;
+            struct record_metadata *rec_md = 0;
+            int md_field_id = -1;
+            int sk_field_id = -1;
+            
+            type = xmlGetProp(n, (xmlChar *) "type");
+            value = xmlNodeListGetString(xdoc, n->children, 1);
+            
+            if (!type || !value || !*value)
+                continue;
+            
+            md_field_id 
+                = conf_service_metadata_field_id(service, (const char *) type);
+            if (md_field_id < 0)
+                continue;
+            
+            ser_md = &service->metadata[md_field_id];
+            
+            if (ser_md->sortkey_offset >= 0)
+            {
+                sk_field_id = ser_md->sortkey_offset;
+                ser_sk = &service->sortkeys[sk_field_id];
+            }
 
             // merged metadata
             rec_md = record_metadata_init(se->nmem, (const char *) value,
                                           ser_md->type, 0);
+            if (!rec_md)
+                continue;
+
             wheretoput = &cluster->metadata[md_field_id];
 
             // and polulate with data:
             // assign cluster or record based on merge action
             if (ser_md->merge == Metadata_merge_unique)
             {
-                struct record_metadata *mnode;
-                for (mnode = *wheretoput; mnode; mnode = mnode->next)
-                    if (!strcmp((const char *) mnode->data.text.disp, 
+                while (*wheretoput)
+                {
+                    if (!strcmp((const char *) (*wheretoput)->data.text.disp, 
                                 rec_md->data.text.disp))
                         break;
-                if (!mnode)
-                {
-                    rec_md->next = *wheretoput;
-                    *wheretoput = rec_md;
+                    wheretoput = &(*wheretoput)->next;
                 }
+                if (!*wheretoput)
+                    *wheretoput = rec_md;
             }
             else if (ser_md->merge == Metadata_merge_longest)
             {
@@ -1454,12 +1741,13 @@ static int ingest_to_cluster(struct client *cl,
                                 nmem_malloc(se->nmem, 
                                             sizeof(union data_types));
                          
-                        prt = pp2_relevance_tokenize(service->sort_pct);
+                        prt =
+                            pp2_charset_token_create(service->charsets, "sort");
 
-                        pp2_relevance_first(prt, rec_md->data.text.disp,
-                                            skip_article);
+                        pp2_charset_token_first(prt, rec_md->data.text.disp,
+                                                skip_article);
 
-                        pp2_relevance_token_next(prt);
+                        pp2_charset_token_next(prt);
                          
                         sort_str = pp2_get_sort(prt);
                          
@@ -1473,13 +1761,14 @@ static int ingest_to_cluster(struct client *cl,
                         }
                         cluster->sortkeys[sk_field_id]->text.sort = 
                             nmem_strdup(se->nmem, sort_str);
-                        pp2_relevance_token_destroy(prt);
+                        pp2_charset_token_destroy(prt);
                     }
                 }
             }
             else if (ser_md->merge == Metadata_merge_all)
             {
-                rec_md->next = *wheretoput;
+                while (*wheretoput)
+                    wheretoput = &(*wheretoput)->next;
                 *wheretoput = rec_md;
             }
             else if (ser_md->merge == Metadata_merge_range)