X-Git-Url: http://git.indexdata.com/?a=blobdiff_plain;f=src%2Fhttp_command.c;h=595f9cf3ffaacaec3a4fbb521be4d0d5895885a3;hb=93224ba0160c80676567032f69c253e439f369e2;hp=4258b29a2999b3c8a01e370244637cebeefc339d;hpb=58aba67e02b51934a2cae721269fb381d8b0b08b;p=pazpar2-moved-to-github.git

diff --git a/src/http_command.c b/src/http_command.c
index 4258b29..595f9cf 100644
--- a/src/http_command.c
+++ b/src/http_command.c
@@ -1,5 +1,5 @@
 /* This file is part of Pazpar2.
-   Copyright (C) 2006-2011 Index Data
+   Copyright (C) 2006-2012 Index Data
 
 Pazpar2 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
@@ -126,7 +126,7 @@ void http_sessions_destroy(http_sessions_t hs)
         {
             struct http_session *s_next = s->next;
             iochan_destroy(s->timeout_iochan);
-            destroy_session(s->psession);
+            session_destroy(s->psession);
             nmem_destroy(s->nmem);
             s = s_next;
         }
@@ -166,7 +166,7 @@ struct http_session *http_session_create(struct conf_service *service,
 
     r->timeout_iochan = iochan_create(-1, session_timeout, 0, "http_session_timeout");
     iochan_setdata(r->timeout_iochan, r);
-    yaz_log(http_sessions->log_level, "%p Session %u created. timeout chan=%p timeout=%d", r, sesid, r->timeout_iochan, service->session_timeout);
+    yaz_log(http_sessions->log_level, "Session %u created. timeout chan=%p timeout=%d", sesid, r->timeout_iochan, service->session_timeout);
     iochan_settimeout(r->timeout_iochan, service->session_timeout);
 
     iochan_add(service->server->iochan_man, r->timeout_iochan);
@@ -180,7 +180,7 @@ void http_session_destroy(struct http_session *s)
 
     http_sessions_t http_sessions = s->http_sessions;
 
-    yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
+    yaz_log(http_sessions->log_level, "Session %u destroy", s->session_id);
     yaz_mutex_enter(http_sessions->mutex);
     /* only if http_session has no active http sessions on it can be destroyed */
     if (s->destroy_counter == s->activity_counter)
@@ -197,15 +197,15 @@ void http_session_destroy(struct http_session *s)
     yaz_mutex_leave(http_sessions->mutex);
     if (must_destroy)
     {   /* destroying for real */
-        yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed", s, s->session_id);
+        yaz_log(http_sessions->log_level, "Session %u destroyed", s->session_id);
         iochan_destroy(s->timeout_iochan);
-        destroy_session(s->psession);
+        session_destroy(s->psession);
         http_session_use(-1);
         nmem_destroy(s->nmem);
     }
     else {
-        yaz_log(http_sessions->log_level, "%p HTTP Session %u destroyed delayed. Active clients (%d-%d). Waiting for new timeout.",
-                s, s->session_id, s->activity_counter, s->destroy_counter);
+        yaz_log(http_sessions->log_level, "Session %u destroying delayed. Active clients (%d-%d). Waiting for new timeout.",
+                s->session_id, s->activity_counter, s->destroy_counter);
     }
 
 }
@@ -229,6 +229,7 @@ static const char *get_msg(enum pazpar2_error_code code)
         { PAZPAR2_RECORD_FAIL, "Record command failed"},
         { PAZPAR2_NOT_IMPLEMENTED, "Not implemented"},
         { PAZPAR2_NO_SERVICE, "No service"},
+        { PAZPAR2_ALREADY_BLOCKED, "Already blocked in session on: "},
         { PAZPAR2_LAST_ERROR, "Last error"},
         { 0, 0 }
     };
@@ -267,6 +268,28 @@ static void error(struct http_response *rs,
     http_send_response(c);
 }
 
+static void response_open_no_status(struct http_channel *c, const char *command)
+{
+    wrbuf_rewind(c->wrbuf);
+    wrbuf_printf(c->wrbuf, "%s<%s>",
+                 HTTP_COMMAND_RESPONSE_PREFIX, command);
+}
+
+static void response_open(struct http_channel *c, const char *command)
+{
+    response_open_no_status(c, command);
+    wrbuf_puts(c->wrbuf, "<status>OK</status>");
+}
+
+static void response_close(struct http_channel *c, const char *command)
+{
+    struct http_response *rs = c->response;
+
+    wrbuf_printf(c->wrbuf, "</%s>", command);
+    rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
+    http_send_response(c);
+}
+
 unsigned int make_sessionid(void)
 {
     static int seq = 0; /* thread pr */
@@ -298,8 +321,8 @@ unsigned int make_sessionid(void)
 
 static struct http_session *locate_session(struct http_channel *c)
 {
-    struct http_response *rs = c->response;
     struct http_request *rq = c->request;
+    struct http_response *rs = c->response;
     struct http_session *p;
     const char *session = http_argbyname(rq, "session");
     http_sessions_t http_sessions = c->http_sessions;
@@ -368,18 +391,15 @@ static int process_settings(struct session *se, struct http_request *rq,
 
 static void cmd_exit(struct http_channel *c)
 {
-    char buf[1024];
-    struct http_response *rs = c->response;
     yaz_log(YLOG_WARN, "exit");
-    sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX "<exit><status>OK</status></exit>");
-    rs->payload = nmem_strdup(c->nmem, buf);
-    http_send_response(c);
+
+    response_open(c, "exit");
+    response_close(c, "exit");
     http_close_server(c->server);
 }
 
 static void cmd_init(struct http_channel *c)
 {
-    char buf[1024];
     struct http_request *r = c->request;
     const char *clear = http_argbyname(r, "clear");
     const char *content_type = http_lookup_header(r->headers, "Content-Type");
@@ -421,26 +441,26 @@ static void cmd_init(struct http_channel *c)
     sesid = make_sessionid();
     s = http_session_create(service, c->http_sessions, sesid);
     
-    yaz_log(c->http_sessions->log_level, "%p Session init %u ", s, sesid);
+    yaz_log(c->http_sessions->log_level, "Session init %u ", sesid);
     if (!clear || *clear == '0')
         session_init_databases(s->psession);
     else
-        yaz_log(YLOG_LOG, "HTTP Session %u init: No databases preloaded", sesid);
+        yaz_log(YLOG_LOG, "Session %u init: No databases preloaded", sesid);
     
     if (process_settings(s->psession, c->request, c->response) < 0)
         return;
-    
-    sprintf(buf, HTTP_COMMAND_RESPONSE_PREFIX 
-            "<init><status>OK</status><session>%d", sesid);
+
+    response_open(c, "init");
+    wrbuf_printf(c->wrbuf, "<session>%d", sesid);
     if (c->server->server_id)
     {
-        strcat(buf, ".");
-        strcat(buf, c->server->server_id);
+        wrbuf_puts(c->wrbuf, ".");
+        wrbuf_puts(c->wrbuf, c->server->server_id);
     }
-    strcat(buf, "</session>"
-           "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol></init>");
-    rs->payload = nmem_strdup(c->nmem, buf);
-    http_send_response(c);
+    wrbuf_puts(c->wrbuf, "</session>"
+               "<protocol>" PAZPAR2_PROTOCOL_VERSION "</protocol>");
+    
+    response_close(c, "init");
 }
 
 static void apply_local_setting(void *client_data,
@@ -471,6 +491,7 @@ static void cmd_settings(struct http_channel *c)
         if (!doc)
         {
             error(rs, PAZPAR2_MALFORMED_SETTING, 0);
+            release_session(c,s);
             return;
         }
         root_n = xmlDocGetRootElement(doc);
@@ -484,144 +505,100 @@ static void cmd_settings(struct http_channel *c)
         release_session(c, s);
         return;
     }
-    rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<settings><status>OK</status></settings>";
-    http_send_response(c);
+    response_open(c, "settings");
+    response_close(c, "settings");
     release_session(c, s);
 }
 
-// Compares two hitsbytarget nodes by hitcount
-static int cmp_ht(const void *p1, const void *p2)
+static void termlist_response(struct http_channel *c, struct http_session *s, const char *cmd_status)
 {
-    const struct hitsbytarget *h1 = p1;
-    const struct hitsbytarget *h2 = p2;
-    return h2->hits - h1->hits;
-}
+    struct http_request *rq = c->request;
+    const char *name = http_argbyname(rq, "name");
+    const char *nums = http_argbyname(rq, "num");
+    int num = 15;
+    int status;
 
-// This implements functionality somewhat similar to 'bytarget', but in a termlist form
-static int targets_termlist(WRBUF wrbuf, struct session *se, int num,
-                             NMEM nmem)
-{
-    struct hitsbytarget *ht;
-    int count, i;
+    if (nums)
+        num = atoi(nums);
 
-    ht = hitsbytarget(se, &count, nmem);
-    qsort(ht, count, sizeof(struct hitsbytarget), cmp_ht);
-    for (i = 0; i < count && i < num && ht[i].hits > 0; i++)
-    {
+    status = session_active_clients(s->psession);
 
-        // do only print terms which have display names
-    
-        wrbuf_puts(wrbuf, "<term>\n");
+    response_open_no_status(c, "termlist");
+    /* new protocol add a status to response. Triggered by a status parameter */
+    if (cmd_status != 0) {
+        wrbuf_printf(c->wrbuf, "<status>%s</status>\n", cmd_status);
+    }
+    wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
 
-        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");
+    perform_termlist(c, s->psession, name, num);
+
+    response_close(c, "termlist");
+}
+
+static void termlist_result_ready(void *data)
+{
+    struct http_channel *c = (struct http_channel *) data;
+    struct http_request *rq = c->request;
+    const char *report = http_argbyname(rq, "report");
+    const char *status = 0;
+    if (report && !strcmp("status", report))
+        status = "OK";
+    struct http_session *s = locate_session(c);
+    if (s) {
+        yaz_log(c->http_sessions->log_level, "Session %u termlist watch released", s->session_id);
+        termlist_response(c, s, status);
+        release_session(c,s);
     }
-    return count;
 }
 
 static void cmd_termlist(struct http_channel *c)
 {
-    struct http_response *rs = c->response;
     struct http_request *rq = c->request;
+    struct http_response *rs = c->response;
     struct http_session *s = locate_session(c);
-    const char *name = http_argbyname(rq, "name");
-    const char *nums = http_argbyname(rq, "num");
-    int num = 15;
-    int status;
-    WRBUF debug_log = 0;
-
+    const char *block = http_argbyname(rq, "block");
+    const char *report = http_argbyname(rq, "report");
+    int report_status = 0;
+    int report_error = 0;
+    const char *status_message = 0;
+    int active_clients;
+    if (report  && !strcmp("error", report)) {
+        report_error = 1;
+        status_message = "OK";
+    }
+    if (report  && !strcmp("status", report)) {
+        report_status = 1;
+        status_message = "OK";
+    }
     if (!s)
         return;
 
-    status = session_active_clients(s->psession);
-
-    if (!name)
-        name = "subject";
-    if (strlen(name) > 255)
-        return;
-    if (nums)
-        num = atoi(nums);
-
-    debug_log = wrbuf_alloc();
-
-    wrbuf_rewind(c->wrbuf);
-
-    wrbuf_puts(c->wrbuf, "<termlist>\n");
-    wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", status);
-    while (*name)
+    active_clients = session_active_clients(s->psession);
+    if (block && !strcmp("1", block) && active_clients)
     {
-        char tname[256];
-        const char *tp;
-
-        if (!(tp = strchr(name, ',')))
-            tp = name + strlen(name);
-        strncpy(tname, name, tp - name);
-        tname[tp - name] = '\0';
-        wrbuf_puts(c->wrbuf, "<list name=\"");
-        wrbuf_xmlputs(c->wrbuf, tname);
-        wrbuf_puts(c->wrbuf, "\">\n");
-        if (!strcmp(tname, "xtargets"))
+        // if there is already a watch/block. we do not block this one
+        if (session_set_watch(s->psession, SESSION_WATCH_TERMLIST,
+                              termlist_result_ready, c, c) != 0)
         {
-            int targets = targets_termlist(c->wrbuf, s->psession, num, c->nmem);
-            wrbuf_printf(debug_log, " xtargets: %d", targets);
+            yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on termlist block. Not supported!", s->session_id);
+            if (report_error) {
+                error(rs, PAZPAR2_ALREADY_BLOCKED, "termlist");
+                release_session(c, s);
+                return;
+            }
+            if (report_status) {
+                status_message = "WARNING (Already blocked on termlist)";
+            }
         }
         else
         {
-            int len;
-            struct termlist_score **p = 
-                get_termlist_score(s->psession, tname, &len);
-            if (p && len)
-                wrbuf_printf(debug_log, " %s: %d", tname, len);
-            if (p)
-            {
-                int i;
-                for (i = 0; i < len && i < num; i++)
-                {
-                    // prevnt sending empty term elements
-                    if (!p[i]->term || !p[i]->term[0])
-                        continue;
-
-                    wrbuf_puts(c->wrbuf, "<term>");
-                    wrbuf_puts(c->wrbuf, "<name>");
-                    wrbuf_xmlputs(c->wrbuf, p[i]->term);
-                    wrbuf_puts(c->wrbuf, "</name>");
-                    
-                    wrbuf_printf(c->wrbuf, 
-                                 "<frequency>%d</frequency>", 
-                                 p[i]->frequency);
-                    wrbuf_puts(c->wrbuf, "</term>\n");
-                }
-            }
+            yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command termlist", s->session_id);
+            release_session(c, s);
+            return;
         }
-        wrbuf_puts(c->wrbuf, "</list>\n");
-        name = tp;
-        if (*name == ',')
-            name++;
     }
-    wrbuf_puts(c->wrbuf, "</termlist>\n");
-    yaz_log(YLOG_DEBUG, "termlist response: %s ", wrbuf_cstr(debug_log));
-    wrbuf_destroy(debug_log);
-    rs->payload = nmem_strdup(rq->channel->nmem, wrbuf_cstr(c->wrbuf));
-    http_send_response(c);
+
+    termlist_response(c, s, status_message);
     release_session(c, s);
 }
 
@@ -638,19 +615,14 @@ static void session_status(struct http_channel *c, struct http_session *s)
 
 static void cmd_session_status(struct http_channel *c)
 {
-    struct http_response *rs = c->response;
     struct http_session *s = locate_session(c);
     if (!s)
         return;
 
-    wrbuf_rewind(c->wrbuf);
-    wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<sessionstatus><status>OK</status>\n");
+    response_open(c, "session-status");
     session_status(c, s);
-    wrbuf_puts(c->wrbuf, "</sessionstatus>\n");
-    rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
-    http_send_response(c);
+    response_close(c, "session-status");
     release_session(c, s);
-
 }
 
 int sessions_count(void);
@@ -663,13 +635,12 @@ int resultsets_count(void);
 
 static void cmd_server_status(struct http_channel *c)
 {
-    struct http_response *rs = c->response;
     int sessions   = sessions_count();
     int clients    = clients_count();
     int resultsets = resultsets_count();
-    wrbuf_rewind(c->wrbuf);
-    wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<server-status>\n");
-    wrbuf_printf(c->wrbuf, "  <sessions>%u</sessions>\n", sessions);
+
+    response_open(c, "server-status");
+    wrbuf_printf(c->wrbuf, "\n  <sessions>%u</sessions>\n", sessions);
     wrbuf_printf(c->wrbuf, "  <clients>%u</clients>\n",   clients);
     /* Only works if yaz has been compiled with enabling of this */
     wrbuf_printf(c->wrbuf, "  <resultsets>%u</resultsets>\n",resultsets);
@@ -693,28 +664,28 @@ static void cmd_server_status(struct http_channel *c)
     }
     yaz_mutex_leave(http_sessions->mutex);
 */
-    wrbuf_puts(c->wrbuf, "</server-status>\n");
-    rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
-    http_send_response(c);
+    response_close(c, "server-status");
     xmalloc_trav(0);
 }
 
-
-static void cmd_bytarget(struct http_channel *c)
-{
-    struct http_response *rs = c->response;
-    struct http_request *rq = c->request;
-    struct http_session *s = locate_session(c);
+static void bytarget_response(struct http_channel *c, struct http_session *s, const char *cmd_status) {
+    int count, i;
     struct hitsbytarget *ht;
+    struct http_request *rq = c->request;
     const char *settings = http_argbyname(rq, "settings");
-    int count, i;
 
-    if (!s)
-        return;
-    ht = hitsbytarget(s->psession, &count, c->nmem);
-    wrbuf_rewind(c->wrbuf);
-    wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<bytarget><status>OK</status>");
+    ht = get_hitsbytarget(s->psession, &count, c->nmem);
+    if (!cmd_status)
+        /* Old protocol, always ok */
+        response_open(c, "bytarget");
+    else {
+        /* New protocol, OK or WARNING (...)*/
+        response_open_no_status(c, "bytarget");
+        wrbuf_printf(c->wrbuf, "<status>%s</status>", cmd_status);
+    }
 
+    if (count == 0)
+        yaz_log(YLOG_WARN, "Empty bytarget Response. No targets found!");
     for (i = 0; i < count; i++)
     {
         wrbuf_puts(c->wrbuf, "\n<target>");
@@ -732,6 +703,14 @@ static void cmd_bytarget(struct http_channel *c)
 
         wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", ht[i].hits);
         wrbuf_printf(c->wrbuf, "<diagnostic>%d</diagnostic>\n", ht[i].diagnostic);
+        if (ht[i].diagnostic)
+        {
+            wrbuf_puts(c->wrbuf, "<addinfo>");
+            if (ht[i].addinfo)
+                wrbuf_xmlputs(c->wrbuf, ht[i].addinfo);
+            wrbuf_puts(c->wrbuf, "</addinfo>\n");
+        }
+
         wrbuf_printf(c->wrbuf, "<records>%d</records>\n", ht[i].records);
 
         wrbuf_puts(c->wrbuf, "<state>");
@@ -743,12 +722,79 @@ static void cmd_bytarget(struct http_channel *c)
             wrbuf_puts(c->wrbuf, ht[i].settings_xml);
             wrbuf_puts(c->wrbuf, "</settings>\n");
         }
+        if (ht[i].suggestions_xml && ht[i].suggestions_xml[0]) {
+            wrbuf_puts(c->wrbuf, "<suggestions>");
+            wrbuf_puts(c->wrbuf, ht[i].suggestions_xml);
+            wrbuf_puts(c->wrbuf, "</suggestions>");
+        }
         wrbuf_puts(c->wrbuf, "</target>");
     }
+    response_close(c, "bytarget");
+}
 
-    wrbuf_puts(c->wrbuf, "</bytarget>");
-    rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
-    http_send_response(c);
+static void bytarget_result_ready(void *data)
+{
+    struct http_channel *c = (struct http_channel *) data;
+    struct http_session *s = locate_session(c);
+    const char *status_message = "OK";
+    if (s) {
+        yaz_log(c->http_sessions->log_level, "Session %u: bytarget watch released", s->session_id);
+        bytarget_response(c, s, status_message);
+        release_session(c, s);
+    }
+    else {
+        yaz_log(c->http_sessions->log_level, "No Session found for released bytarget watch");
+    }
+}
+
+
+static void cmd_bytarget(struct http_channel *c)
+{
+    struct http_request *rq = c->request;
+    struct http_response *rs = c->response;
+    struct http_session *s = locate_session(c);
+    const char *block = http_argbyname(rq, "block");
+    const char *report = http_argbyname(rq, "report");
+    int block_error = 0;
+    int report_status = 0;
+    const char *status_message = "OK";
+    if (report && !strcmp("error", report)) {
+        block_error = 1;
+    }
+    if (report && !strcmp("status", report)) {
+        report_status = 1;
+    }
+
+    int no_active;
+
+    if (!s)
+        return;
+
+    no_active = session_active_clients(s->psession);
+    if (block && !strcmp("1",block) && no_active)
+    {
+        // if there is already a watch/block. we do not block this one
+        if (session_set_watch(s->psession, SESSION_WATCH_BYTARGET,
+                              bytarget_result_ready, c, c) != 0)
+        {
+            yaz_log(YLOG_WARN, "Session %u: Attempt to block multiple times on bytarget block. Not supported!", s->session_id);
+            if (block_error) {
+                error(rs, PAZPAR2_ALREADY_BLOCKED, "bytarget");
+                release_session(c, s);
+                return;
+            }
+            if (report_status) {
+                status_message = "WARNING (Already blocked on bytarget)";
+            }
+        }
+        else
+        {
+            yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command bytarget", s->session_id);
+            release_session(c, s);
+            return;
+        }
+    }
+    bytarget_response(c, s, status_message);
     release_session(c, s);
 }
 
@@ -787,6 +833,7 @@ static void write_metadata(WRBUF w, struct conf_service *service,
                     break;
                 default:
                     wrbuf_puts(w, "[can't represent]");
+                    break;
             }
             wrbuf_printf(w, "</md-%s>", cmd->name);
         }
@@ -800,7 +847,7 @@ static void write_subrecord(struct record *r, WRBUF w,
         client_get_database(r->client), PZ_NAME);
 
     wrbuf_puts(w, "<location id=\"");
-    wrbuf_xmlputs(w, client_get_database(r->client)->database->url);
+    wrbuf_xmlputs(w, client_get_id(r->client));
     wrbuf_puts(w, "\" ");
 
     wrbuf_puts(w, "name=\"");
@@ -860,11 +907,10 @@ void show_raw_reset(void *data, struct http_channel *c, void *data2)
 
 static void cmd_record_ready(void *data);
 
-static void cmd_record(struct http_channel *c)
+static void show_record(struct http_channel *c, struct http_session *s)
 {
     struct http_response *rs = c->response;
     struct http_request *rq = c->request;
-    struct http_session *s = locate_session(c);
     struct record_cluster *rec, *prev_r, *next_r;
     struct record *r;
     struct conf_service *service;
@@ -892,7 +938,6 @@ static void cmd_record(struct http_channel *c)
         {
             error(rs, PAZPAR2_RECORD_MISSING, idstr);
         }
-        release_session(c, s);
         return;
     }
     if (offsetstr)
@@ -903,7 +948,8 @@ static void cmd_record(struct http_channel *c)
         int i;
         struct record*r = rec->records;
         int binary = 0;
-
+        const char *nativesyntax = http_argbyname(rq, "nativesyntax");
+        
         if (binarystr && *binarystr != '0')
             binary = 1;
 
@@ -918,13 +964,14 @@ static void cmd_record(struct http_channel *c)
             http_channel_observer_t obs =
                 http_add_observer(c, r->client, show_raw_reset);
             int ret = client_show_raw_begin(r->client, r->position,
-                                        syntax, esn, 
-                                        obs /* data */,
-                                        show_raw_record_error,
-                                        (binary ? 
-                                         show_raw_record_ok_binary : 
-                                         show_raw_record_ok),
-                                        (binary ? 1 : 0));
+                                            syntax, esn,
+                                            obs /* data */,
+                                            show_raw_record_error,
+                                            (binary ? 
+                                             show_raw_record_ok_binary : 
+                                             show_raw_record_ok),
+                                            (binary ? 1 : 0),
+                                            nativesyntax);
             if (ret == -1)
             {
                 http_remove_observer(obs);
@@ -934,8 +981,8 @@ static void cmd_record(struct http_channel *c)
     }
     else
     {
-        wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<record>\n");
-        wrbuf_puts(c->wrbuf, "<recid>");
+        response_open_no_status(c, "record");
+        wrbuf_puts(c->wrbuf, "\n<recid>");
         wrbuf_xmlputs(c->wrbuf, rec->recid);
         wrbuf_puts(c->wrbuf, "</recid>\n");
         if (prev_r)
@@ -955,26 +1002,36 @@ static void cmd_record(struct http_channel *c)
         write_metadata(c->wrbuf, service, rec->metadata, 1);
         for (r = rec->records; r; r = r->next)
             write_subrecord(r, c->wrbuf, service, 1);
-        wrbuf_puts(c->wrbuf, "</record>\n");
-        rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
-        http_send_response(c);
+        response_close(c, "record");
     }
     show_single_stop(s->psession, rec);
-    release_session(c, s);
 }
 
 static void cmd_record_ready(void *data)
 {
     struct http_channel *c = (struct http_channel *) data;
+    struct http_session *s = locate_session(c);
+    if (s) {
+        yaz_log(c->http_sessions->log_level, "Session %u: record watch released", s->session_id);
+        show_record(c, s);
+        release_session(c,s);
+    }
+}
 
-    cmd_record(c);
+static void cmd_record(struct http_channel *c)
+{
+    struct http_session *s = locate_session(c);
+    if (s) {
+        show_record(c, s);
+        release_session(c,s);
+    }
 }
 
-static void show_records(struct http_channel *c, int active)
+
+static void show_records(struct http_channel *c, struct http_session *s, int active)
 {
     struct http_request *rq = c->request;
     struct http_response *rs = c->response;
-    struct http_session *s = locate_session(c);
     struct record_cluster **rl;
     struct reclist_sortparms *sp;
     const char *start = http_argbyname(rq, "start");
@@ -1002,16 +1059,14 @@ static void show_records(struct http_channel *c, int active)
     if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
     {
         error(rs, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
-        release_session(c, s);
         return;
-    }
 
+    }
     
     rl = show_range_start(s->psession, sp, startn, &numn, &total, &total_hits);
 
-    wrbuf_rewind(c->wrbuf);
-    wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<show>\n<status>OK</status>\n");
-    wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", active);
+    response_open(c, "show");
+    wrbuf_printf(c->wrbuf, "\n<activeclients>%d</activeclients>\n", active);
     wrbuf_printf(c->wrbuf, "<merged>%d</merged>\n", total);
     wrbuf_printf(c->wrbuf, "<total>" ODR_INT_PRINTF "</total>\n", total_hits);
     wrbuf_printf(c->wrbuf, "<start>%d</start>\n", startn);
@@ -1041,29 +1096,48 @@ static void show_records(struct http_channel *c, int active)
 
     show_range_stop(s->psession, rl);
 
-    wrbuf_puts(c->wrbuf, "</show>\n");
-    rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
-    http_send_response(c);
-    release_session(c, s);
+    response_close(c, "show");
 }
 
 static void show_records_ready(void *data)
 {
     struct http_channel *c = (struct http_channel *) data;
-
-    show_records(c, -1);
+    struct http_session *s = locate_session(c);
+    if (s) {
+        yaz_log(c->http_sessions->log_level, "Session %u: show watch released", s->session_id);
+        show_records(c, s, -1);
+    }
+    else {
+        /* some error message  */
+    }
+    release_session(c,s);
 }
 
 static void cmd_show(struct http_channel *c)
 {
-    struct http_request *rq = c->request;
+    struct http_request  *rq = c->request;
+    struct http_response *rs = c->response;
     struct http_session *s = locate_session(c);
     const char *block = http_argbyname(rq, "block");
+    const char *sort = http_argbyname(rq, "sort");
+    const char *block_error = http_argbyname(rq, "error");
+    struct reclist_sortparms *sp;
     int status;
 
     if (!s)
         return;
 
+    if (!sort)
+        sort = "relevance";
+    
+    if (!(sp = reclist_parse_sortparms(c->nmem, sort, s->psession->service)))
+    {
+        error(c->response, PAZPAR2_MALFORMED_PARAMETER_VALUE, "sort");
+        release_session(c, s);
+        return;
+    }
+    session_sort(s->psession, sp->name, sp->increasing);
+
     status = session_active_clients(s->psession);
 
     if (block)
@@ -1072,39 +1146,56 @@ static void cmd_show(struct http_channel *c)
         {
             // if there is already a watch/block. we do not block this one
             if (session_set_watch(s->psession, SESSION_WATCH_SHOW_PREF,
-                                  show_records_ready, c, c) != 0)
+                                  show_records_ready, c, c) == 0)
             {
                 yaz_log(c->http_sessions->log_level,
-                        "%p Session %u: Blocking on cmd_show. Waiting for preferred targets", s, s->session_id);
+                        "Session %u: Blocking on command show (preferred targets)", s->session_id);
+                release_session(c, s);
+                return;
+            }
+            else
+            {
+                yaz_log(YLOG_WARN, "Attempt to block multiple times on show (preferred targets) block. Not supported!");
+                if (block_error && !strcmp("1", block_error)) {
+                    error(rs, PAZPAR2_ALREADY_BLOCKED, "show (preferred targets)");
+                    release_session(c, s);
+                    return;
+                }
             }
-            release_session(c, s);
-            return;
 
         }
-        else if (status && reclist_get_num_records(s->psession->reclist) == 0)
+        else if (status)
         {
             // if there is already a watch/block. we do not block this one
             if (session_set_watch(s->psession, SESSION_WATCH_SHOW,
                                   show_records_ready, c, c) != 0)
             {
-                yaz_log(c->http_sessions->log_level, "%p Session %u: Blocking on cmd_show", s, s->session_id);
+                yaz_log(YLOG_WARN, "Attempt to block multiple times on show block. Not supported!");
+                if (block_error && !strcmp("1", block_error)) {
+                    error(rs, PAZPAR2_ALREADY_BLOCKED, "show");
+                    release_session(c, s);
+                    return;
+                }
+            }
+            else
+            {
+                yaz_log(c->http_sessions->log_level, "Session %u: Blocking on command show", s->session_id);
+                release_session(c, s);
+                return;
             }
-            release_session(c, s);
-            return;
         }
     }
-    show_records(c, status);
+    show_records(c, s, status);
     release_session(c, s);
 }
 
 static void cmd_ping(struct http_channel *c)
 {
-    struct http_response *rs = c->response;
     struct http_session *s = locate_session(c);
     if (!s)
         return;
-    rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<ping><status>OK</status></ping>";
-    http_send_response(c);
+    response_open(c, "ping");
+    response_close(c, "ping");
     release_session(c, s);
 }
 
@@ -1135,23 +1226,22 @@ static void cmd_search(struct http_channel *c)
         release_session(c, s);
         return;
     }
-    code = search(s->psession, query, startrecs, maxrecs, filter, limit,
-                  &addinfo);
+    code = session_search(s->psession, query, startrecs, maxrecs, filter, limit,
+                          &addinfo, "relevance", 0);
     if (code)
     {
         error(rs, code, addinfo);
         release_session(c, s);
         return;
     }
-    rs->payload = HTTP_COMMAND_RESPONSE_PREFIX "<search><status>OK</status></search>";
-    http_send_response(c);
+    response_open(c, "search");
+    response_close(c, "search");
     release_session(c, s);
 }
 
 
 static void cmd_stat(struct http_channel *c)
 {
-    struct http_response *rs = c->response;
     struct http_session *s = locate_session(c);
     struct statistics stat;
     int clients;
@@ -1169,8 +1259,7 @@ static void cmd_stat(struct http_channel *c)
     	progress = (stat.num_clients  - clients) / (float)stat.num_clients;
     }
 
-    wrbuf_rewind(c->wrbuf);
-    wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<stat>");
+    response_open_no_status(c, "stat");
     wrbuf_printf(c->wrbuf, "<activeclients>%d</activeclients>\n", clients);
     wrbuf_printf(c->wrbuf, "<hits>" ODR_INT_PRINTF "</hits>\n", stat.num_hits);
     wrbuf_printf(c->wrbuf, "<records>%d</records>\n", stat.num_records);
@@ -1182,19 +1271,15 @@ static void cmd_stat(struct http_channel *c)
     wrbuf_printf(c->wrbuf, "<failed>%d</failed>\n", stat.num_failed);
     wrbuf_printf(c->wrbuf, "<error>%d</error>\n", stat.num_error);
     wrbuf_printf(c->wrbuf, "<progress>%.2f</progress>\n", progress);
-    wrbuf_puts(c->wrbuf, "</stat>");
-    rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
-    http_send_response(c);
+    response_close(c, "stat");
     release_session(c, s);
 }
 
 static void cmd_info(struct http_channel *c)
 {
     char yaz_version_str[20];
-    struct http_response *rs = c->response;
 
-    wrbuf_rewind(c->wrbuf);
-    wrbuf_puts(c->wrbuf, HTTP_COMMAND_RESPONSE_PREFIX "<info>\n");
+    response_open_no_status(c, "info");
     wrbuf_puts(c->wrbuf, " <version>\n");
     wrbuf_puts(c->wrbuf, "  <pazpar2");
 #ifdef PAZPAR2_VERSION_SHA1
@@ -1204,7 +1289,6 @@ static void cmd_info(struct http_channel *c)
     wrbuf_xmlputs(c->wrbuf, VERSION);
     wrbuf_puts(c->wrbuf, "</pazpar2>");
 
-
     yaz_version(yaz_version_str, 0);
     wrbuf_puts(c->wrbuf, "  <yaz compiled=\"");
     wrbuf_xmlputs(c->wrbuf, YAZ_VERSION);
@@ -1216,9 +1300,7 @@ static void cmd_info(struct http_channel *c)
     
     info_services(c->server, c->wrbuf);
 
-    wrbuf_puts(c->wrbuf, "</info>");
-    rs->payload = nmem_strdup(c->nmem, wrbuf_cstr(c->wrbuf));
-    http_send_response(c);
+    response_close(c, "info");
 }
 
 struct {