r2152 - countRefsOfType(), eq() and neq() functions are not necessary any more

[racktables] / inc / database.php

<?php
/*
*
*  This file is a library of database access functions for RackTables.
*
*/

function escapeString ($value, $do_db_escape = TRUE)
{
        $ret = htmlspecialchars ($value, ENT_QUOTES, 'UTF-8');
        if ($do_db_escape)
        {
                global $dbxlink;
                $ret = substr ($dbxlink->quote ($ret), 1, -1);
        }
        return $ret;
}

function getRackspace ($tagfilter = array(), $tfmode = 'any')
{
        $whereclause = getWhereClause ($tagfilter);
        $query =
                "select dict_key as row_id, dict_value as row_name " .
                "from Chapter natural join Dictionary left join Rack on Rack.row_id = dict_key " .
                "left join TagStorage on Rack.id = TagStorage.target_id and target_realm = 'rack' " .
                "where chapter_name = 'RackRow' " .
                $whereclause .
                " order by dict_value";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $clist = array ('row_id', 'row_name');
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach ($clist as $cname)
                        $ret[$row['row_id']][$cname] = $row[$cname];
        $result->closeCursor();
        return $ret;
}

// Return detailed information about one rack row.
function getRackRowInfo ($rackrow_id)
{
        $query =
                "select dict_key as id, dict_value as name, count(Rack.id) as count, " .
                "if(isnull(sum(Rack.height)),0,sum(Rack.height)) as sum " .
                "from Chapter natural join Dictionary left join Rack on Rack.row_id = dict_key " .
                "where chapter_name = 'RackRow' and dict_key = ${rackrow_id} " .
                "group by dict_key";
        $result = useSelectBlade ($query, __FUNCTION__);
        if ($row = $result->fetch (PDO::FETCH_ASSOC))
                return $row;
        else
                return NULL;
}

// This function returns id->name map for all object types. The map is used
// to build <select> input for objects.
function getObjectTypeList ()
{
        return readChapter ('RackObjectType');
}

// Return a part of SQL query suitable for embeding into a bigger text.
// The returned result should list all tag IDs shown in the tag filter.
function getWhereClause ($tagfilter = array())
{
        $whereclause = '';
        if (count ($tagfilter))
        {
                $whereclause .= ' and (';
                $conj = '';
                foreach ($tagfilter as $tag_id)
                {
                        $whereclause .= $conj . 'tag_id = ' . $tag_id;
                        $conj = ' or ';
                }
                $whereclause .= ') ';
        }
        return $whereclause;
}

// Return a simple object list w/o related information.
function getNarrowObjectList ($type_id = 0)
{
        $ret = array();
        if (!$type_id)
        {
                showError ('Invalid argument', __FUNCTION__);
                return $ret;
        }
        // object type id is known and constant, but it's Ok to have this standard overhead
        $query =
                "select RackObject.id as id, RackObject.name as name, dict_value as objtype_name, " .
                "objtype_id from " .
                "RackObject inner join Dictionary on objtype_id=dict_key natural join Chapter " .
                "where RackObject.deleted = 'no' and chapter_name = 'RackObjectType' " .
                "and objtype_id = ${type_id} " .
                "order by name";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                foreach (array (
                        'id',
                        'name',
                        'objtype_name',
                        'objtype_id'
                        ) as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
                $ret[$row['id']]['dname'] = displayedName ($ret[$row['id']]);
        }
        return $ret;
}

// Return a filtered, detailed object list.
function getObjectList ($type_id = 0, $tagfilter = array(), $tfmode = 'any')
{
        $whereclause = getWhereClause ($tagfilter);
        if ($type_id != 0)
                $whereclause .= " and objtype_id = '${type_id}' ";
        $query =
                "select distinct RackObject.id as id , RackObject.name as name, dict_value as objtype_name, " .
                "RackObject.label as label, RackObject.barcode as barcode, " .
                "dict_key as objtype_id, asset_no, rack_id, Rack.name as Rack_name from " .
                "((RackObject inner join Dictionary on objtype_id=dict_key natural join Chapter) " .
                "left join RackSpace on RackObject.id = object_id) " .
                "left join Rack on rack_id = Rack.id " .
                "left join TagStorage on RackObject.id = TagStorage.target_id and target_realm = 'object' " .
                "where RackObject.deleted = 'no' and chapter_name = 'RackObjectType' " .
                $whereclause .
                "order by name";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                foreach (array (
                        'id',
                        'name',
                        'label',
                        'barcode',
                        'objtype_name',
                        'objtype_id',
                        'asset_no',
                        'rack_id',
                        'Rack_name'
                        ) as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
                $ret[$row['id']]['dname'] = displayedName ($ret[$row['id']]);
        }
        $result->closeCursor();
        return $ret;
}

function getRacksForRow ($row_id = 0, $tagfilter = array(), $tfmode = 'any')
{
        $query =
                "select Rack.id, Rack.name, height, Rack.comment, row_id, " .
                "'yes' as left_is_front, 'yes' as bottom_is_unit1, dict_value as row_name " .
                "from Rack left join Dictionary on row_id = dict_key natural join Chapter " .
                "left join TagStorage on Rack.id = TagStorage.target_id and target_realm = 'rack' " .
                "where chapter_name = 'RackRow' and Rack.deleted = 'no' " .
                (($row_id == 0) ? "" : "and row_id = ${row_id} ") .
                getWhereClause ($tagfilter) .
                " order by row_name, Rack.id";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $clist = array
        (
                'id',
                'name',
                'height',
                'comment',
                'row_id',
                'left_is_front',
                'bottom_is_unit1',
                'row_name'
        );
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach ($clist as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
        $result->closeCursor();
        usort ($ret, 'sortRacks');
        $ret = restoreRackIDs ($ret);
        return $ret;
}

// This is a popular helper for getting information about
// a particular rack and its rackspace at once.
function getRackData ($rack_id = 0, $silent = FALSE)
{
        if ($rack_id == 0)
        {
                if ($silent == FALSE)
                        showError ('Invalid rack_id', __FUNCTION__);
                return NULL;
        }
        $query =
                "select Rack.id, Rack.name, row_id, height, Rack.comment, " .
                "'yes' as left_is_front, 'yes' as bottom_is_unit1, dict_value as row_name from " .
                "Rack left join Dictionary on Rack.row_id = dict_key natural join Chapter " .
                "where chapter_name = 'RackRow' and Rack.id='${rack_id}' and Rack.deleted = 'no' limit 1";
        $result = useSelectBlade ($query, __FUNCTION__);
        if (($row = $result->fetch (PDO::FETCH_ASSOC)) == NULL)
        {
                if ($silent == FALSE)
                        showError ('Query #1 succeded, but returned no data', __FUNCTION__);
                return NULL;
        }

        // load metadata
        $clist = array
        (
                'id',
                'name',
                'height',
                'comment',
                'row_id',
                'left_is_front',
                'bottom_is_unit1',
                'row_name'
        );
        foreach ($clist as $cname)
                $rack[$cname] = $row[$cname];
        $result->closeCursor();
        unset ($result);

        // start with default rackspace
        for ($i = $rack['height']; $i > 0; $i--)
                for ($locidx = 0; $locidx < 3; $locidx++)
                        $rack[$i][$locidx]['state'] = 'F';

        // load difference
        $query =
                "select unit_no, atom, state, object_id " .
                "from RackSpace where rack_id = ${rack_id} and " .
                "unit_no between 1 and " . $rack['height'] . " order by unit_no";
        $result = useSelectBlade ($query, __FUNCTION__);
        global $loclist;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $rack[$row['unit_no']][$loclist[$row['atom']]]['state'] = $row['state'];
                $rack[$row['unit_no']][$loclist[$row['atom']]]['object_id'] = $row['object_id'];
        }
        $result->closeCursor();
        return $rack;
}

// This is a popular helper.
function getObjectInfo ($object_id = 0)
{
        if ($object_id == 0)
        {
                showError ('Invalid object_id', __FUNCTION__);
                return;
        }
        $query =
                "select id, name, label, barcode, dict_value as objtype_name, asset_no, dict_key as objtype_id, has_problems, comment from " .
                "RackObject inner join Dictionary on objtype_id = dict_key natural join Chapter " .
                "where id = '${object_id}' and deleted = 'no' and chapter_name = 'RackObjectType' limit 1";
        $result = useSelectBlade ($query, __FUNCTION__);
        if (($row = $result->fetch (PDO::FETCH_ASSOC)) == NULL)
        {
                showError ('Query succeeded, but returned no data', __FUNCTION__);
                $ret = NULL;
        }
        else
        {
                $ret['id'] = $row['id'];
                $ret['name'] = $row['name'];
                $ret['label'] = $row['label'];
                $ret['barcode'] = $row['barcode'];
                $ret['objtype_name'] = $row['objtype_name'];
                $ret['objtype_id'] = $row['objtype_id'];
                $ret['has_problems'] = $row['has_problems'];
                $ret['asset_no'] = $row['asset_no'];
                $ret['dname'] = displayedName ($ret);
                $ret['comment'] = $row['comment'];
        }
        $result->closeCursor();
        unset ($result);
        return $ret;
}

function getPortTypes ()
{
        return readChapter ('PortType');
}

function getObjectPortsAndLinks ($object_id = 0)
{
        if ($object_id == 0)
        {
                showError ('Invalid object_id', __FUNCTION__);
                return;
        }
        $query =
                "select Port.id as Port_id, ".
                "Port.name as Port_name, ".
                "Port.label as Port_label, ".
                "Port.l2address as Port_l2address, ".
                "Port.type as Port_type, ".
                "Port.reservation_comment as Port_reservation_comment, " .
                "dict_value as PortType_name, ".
                "RemotePort.id as RemotePort_id, ".
                "RemotePort.name as RemotePort_name, ".
                "RemotePort.object_id as RemotePort_object_id, ".
                "RackObject.name as RackObject_name ".
                "from (".
                        "(".
                                "(".
                                        "Port inner join Dictionary on Port.type = dict_key natural join Chapter".
                                ") ".
                                "left join Link on Port.id=Link.porta or Port.id=Link.portb ".
                        ") ".
                        "left join Port as RemotePort on Link.portb=RemotePort.id or Link.porta=RemotePort.id ".
                ") ".
                "left join RackObject on RemotePort.object_id=RackObject.id ".
                "where chapter_name = 'PortType' and Port.object_id=${object_id} ".
                "and (Port.id != RemotePort.id or RemotePort.id is null) ".
                "order by Port_name";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret=array();
        $count=0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ret[$count]['id'] = $row['Port_id'];
                $ret[$count]['name'] = $row['Port_name'];
                $ret[$count]['l2address'] = l2addressFromDatabase ($row['Port_l2address']);
                $ret[$count]['label'] = $row['Port_label'];
                $ret[$count]['type_id'] = $row['Port_type'];
                $ret[$count]['type'] = $row['PortType_name'];
                $ret[$count]['reservation_comment'] = $row['Port_reservation_comment'];
                $ret[$count]['remote_id'] = $row['RemotePort_id'];
                $ret[$count]['remote_name'] = htmlentities ($row['RemotePort_name'], ENT_QUOTES);
                $ret[$count]['remote_object_id'] = $row['RemotePort_object_id'];
                $ret[$count]['remote_object_name'] = $row['RackObject_name'];
                // Save on displayedName() calls.
                if (empty ($row['RackObject_name']) and !empty ($row['RemotePort_object_id']))
                {
                        $oi = getObjectInfo ($row['RemotePort_object_id']);
                        $ret[$count]['remote_object_name'] = displayedName ($oi);
                }
                $count++;
        }
        $result->closeCursor();
        return $ret;
}

function commitAddRack ($name, $height = 0, $row_id = 0, $comment, $taglist)
{
        if ($row_id <= 0 or $height <= 0 or empty ($name))
                return FALSE;
        $result = useInsertBlade
        (
                'Rack',
                array
                (
                        'row_id' => $row_id,
                        'name' => "'${name}'",
                        'height' =>  $height,
                        'comment' => "'${comment}'"
                )
        );
        if ($result == NULL)
        {
                showError ('useInsertBlade() failed', __FUNCTION__);
                return FALSE;
        }
        $last_insert_id = lastInsertID();
        return (produceTagsForLastRecord ('rack', $taglist, $last_insert_id) == '') and recordHistory ('Rack', "id = ${last_insert_id}");
}

function commitAddObject ($new_name, $new_label, $new_barcode, $new_type_id, $new_asset_no, $taglist = array())
{
        global $dbxlink;
        // Maintain UNIQUE INDEX for common names and asset tags by
        // filtering out empty strings (not NULLs).
        $result1 = useInsertBlade
        (
                'RackObject',
                array
                (
                        'name' => empty ($new_name) ? 'NULL' : "'${new_name}'",
                        'label' => "'${new_label}'",
                        'barcode' => empty ($new_barcode) ? 'NULL' : "'${new_barcode}'",
                        'objtype_id' => $new_type_id,
                        'asset_no' => empty ($new_asset_no) ? 'NULL' : "'${new_asset_no}'"
                )
        );
        if ($result1 == NULL)
        {
                showError ("SQL query #1 failed", __FUNCTION__);
                return FALSE;
        }
        $last_insert_id = lastInsertID();
        // Do AutoPorts magic
        executeAutoPorts ($last_insert_id, $new_type_id);
        // Now tags...
        $error = produceTagsForLastRecord ('object', $taglist, $last_insert_id);
        if ($error != '')
        {
                showError ("Error adding tags for the object: ${error}");
                return FALSE;
        }
        return recordHistory ('RackObject', "id = ${last_insert_id}");
}

function commitUpdateObject ($object_id = 0, $new_name = '', $new_label = '', $new_barcode = '', $new_type_id = 0, $new_has_problems = 'no', $new_asset_no = '', $new_comment = '')
{
        if ($object_id == 0 || $new_type_id == 0)
        {
                showError ('Not all required args are present.', __FUNCTION__);
                return FALSE;
        }
        global $dbxlink;
        $new_asset_no = empty ($new_asset_no) ? 'NULL' : "'${new_asset_no}'";
        $new_barcode = empty ($new_barcode) ? 'NULL' : "'${new_barcode}'";
        $new_name = empty ($new_name) ? 'NULL' : "'${new_name}'";
        $query = "update RackObject set name=${new_name}, label='${new_label}', barcode=${new_barcode}, objtype_id='${new_type_id}', " .
                "has_problems='${new_has_problems}', asset_no=${new_asset_no}, comment='${new_comment}' " .
                "where id='${object_id}' limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ("SQL query '${query}' failed", __FUNCTION__);
                return FALSE;
        }
        $result->closeCursor();
        return recordHistory ('RackObject', "id = ${object_id}");
}

function commitUpdateRack ($rack_id, $new_name, $new_height, $new_row_id, $new_comment)
{
        if (empty ($rack_id) || empty ($new_name) || empty ($new_height))
        {
                showError ('Not all required args are present.', __FUNCTION__);
                return FALSE;
        }
        global $dbxlink;
        $query = "update Rack set name='${new_name}', height='${new_height}', comment='${new_comment}', row_id=${new_row_id} " .
                "where id='${rack_id}' limit 1";
        $result1 = $dbxlink->query ($query);
        if ($result1->rowCount() != 1)
        {
                showError ('Error updating rack information', __FUNCTION__);
                return FALSE;
        }
        return recordHistory ('Rack', "id = ${rack_id}");
}

// This function accepts rack data returned by getRackData(), validates and applies changes
// supplied in $_REQUEST and returns resulting array. Only those changes are examined, which
// correspond to current rack ID.
// 1st arg is rackdata, 2nd arg is unchecked state, 3rd arg is checked state.
// If 4th arg is present, object_id fields will be updated accordingly to the new state.
// The function returns the modified rack upon success.
function processGridForm (&$rackData, $unchecked_state, $checked_state, $object_id = 0)
{
        global $loclist, $dbxlink;
        $rack_id = $rackData['id'];
        $rack_name = $rackData['name'];
        $rackchanged = FALSE;
        for ($unit_no = $rackData['height']; $unit_no > 0; $unit_no--)
        {
                for ($locidx = 0; $locidx < 3; $locidx++)
                {
                        if ($rackData[$unit_no][$locidx]['enabled'] != TRUE)
                                continue;
                        // detect a change
                        $state = $rackData[$unit_no][$locidx]['state'];
                        if (isset ($_REQUEST["atom_${rack_id}_${unit_no}_${locidx}"]) and $_REQUEST["atom_${rack_id}_${unit_no}_${locidx}"] == 'on')
                                $newstate = $checked_state;
                        else
                                $newstate = $unchecked_state;
                        if ($state == $newstate)
                                continue;
                        $rackchanged = TRUE;
                        // and validate
                        $atom = $loclist[$locidx];
                        // The only changes allowed are those introduced by checkbox grid.
                        if
                        (
                                !($state == $checked_state && $newstate == $unchecked_state) &&
                                !($state == $unchecked_state && $newstate == $checked_state)
                        )
                                return array ('code' => 500, 'message' => "${rack_name}: Rack ID ${rack_id}, unit ${unit_no}, 'atom ${atom}', cannot change state from '${state}' to '${newstate}'");
                        // Here we avoid using ON DUPLICATE KEY UPDATE by first performing DELETE
                        // anyway and then looking for probable need of INSERT.
                        $query =
                                "delete from RackSpace where rack_id = ${rack_id} and " .
                                "unit_no = ${unit_no} and atom = '${atom}' limit 1";
                        $r = $dbxlink->query ($query);
                        if ($r == NULL)
                                return array ('code' => 500, 'message' => __FUNCTION__ . ": ${rack_name}: SQL DELETE query failed");
                        if ($newstate != 'F')
                        {
                                $query =
                                        "insert into RackSpace(rack_id, unit_no, atom, state) " .
                                        "values(${rack_id}, ${unit_no}, '${atom}', '${newstate}') ";
                                $r = $dbxlink->query ($query);
                                if ($r == NULL)
                                        return array ('code' => 500, 'message' => __FUNCTION__ . ": ${rack_name}: SQL INSERT query failed");
                        }
                        if ($newstate == 'T' and $object_id != 0)
                        {
                                // At this point we already have a record in RackSpace.
                                $query =
                                        "update RackSpace set object_id=${object_id} " .
                                        "where rack_id=${rack_id} and unit_no=${unit_no} and atom='${atom}' limit 1";
                                $r = $dbxlink->query ($query);
                                if ($r->rowCount() == 1)
                                        $rackData[$unit_no][$locidx]['object_id'] = $object_id;
                                else
                                        return array ('code' => 500, 'message' => "${rack_name}: Rack ID ${rack_id}, unit ${unit_no}, atom '${atom}' failed to set object_id to '${object_id}'");
                        }
                }
        }
        if ($rackchanged)
        {
                resetThumbCache ($rack_id);
                return array ('code' => 200, 'message' => "${rack_name}: All changes were successfully saved.");
        }
        else
                return array ('code' => 300, 'message' => "${rack_name}: No changes.");
}

// This function builds a list of rack-unit-atom records, which are assigned to
// the requested object.
function getMoleculeForObject ($object_id = 0)
{
        if ($object_id == 0)
        {
                showError ("object_id == 0", __FUNCTION__);
                return NULL;
        }
        $query =
                "select rack_id, unit_no, atom from RackSpace " .
                "where state = 'T' and object_id = ${object_id} order by rack_id, unit_no, atom";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = $result->fetchAll (PDO::FETCH_ASSOC);
        $result->closeCursor();
        return $ret;
}

// This function builds a list of rack-unit-atom records for requested molecule.
function getMolecule ($mid = 0)
{
        if ($mid == 0)
        {
                showError ("mid == 0", __FUNCTION__);
                return NULL;
        }
        $query =
                "select rack_id, unit_no, atom from Atom " .
                "where molecule_id=${mid}";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = $result->fetchAll (PDO::FETCH_ASSOC);
        $result->closeCursor();
        return $ret;
}

// returns exactly what is's named after
function lastInsertID ()
{
        if (NULL == ($result = useSelectBlade ('select last_insert_id()', __FUNCTION__)))
        {
                showError ('SQL query failed!', __FUNCTION__);
                die;
        }
        $row = $result->fetch (PDO::FETCH_NUM);
        return $row[0];
}

// This function creates a new record in Molecule and number of linked
// R-U-A records in Atom.
function createMolecule ($molData)
{
        global $dbxlink;
        $query = "insert into Molecule values()";
        $result1 = $dbxlink->query ($query);
        if ($result1->rowCount() != 1)
        {
                showError ('Error inserting into Molecule', __FUNCTION__);
                return NULL;
        }
        $molecule_id = lastInsertID();
        foreach ($molData as $rua)
        {
                $rack_id = $rua['rack_id'];
                $unit_no = $rua['unit_no'];
                $atom = $rua['atom'];
                $query =
                        "insert into Atom(molecule_id, rack_id, unit_no, atom) " .
                        "values (${molecule_id}, ${rack_id}, ${unit_no}, '${atom}')";
                $result3 = $dbxlink->query ($query);
                if ($result3 == NULL or $result3->rowCount() != 1)
                {
                        showError ('Error inserting into Atom', __FUNCTION__);
                        return NULL;
                }
        }
        return $molecule_id;
}

// History logger. This function assumes certain table naming convention and
// column design:
// 1. History table name equals to dictionary table name plus 'History'.
// 2. History table must have the same row set (w/o keys) plus one row named
// 'ctime' of type 'timestamp'.
function recordHistory ($tableName, $whereClause)
{
        global $dbxlink, $remote_username;
        $query = "insert into ${tableName}History select *, current_timestamp(), '${remote_username}' from ${tableName} where ${whereClause}";
        $result = $dbxlink->query ($query);
        if ($result == NULL or $result->rowCount() != 1)
        {
                showError ("SQL query '${query}' failed for table ${tableName}", __FUNCTION__);
                return FALSE;
        }
        return TRUE;
}

function getRackspaceHistory ()
{
        $query =
                "select mo.id as mo_id, ro.id as ro_id, ro.name, mo.ctime, mo.comment, dict_value as objtype_name, user_name from " .
                "MountOperation as mo inner join RackObject as ro on mo.object_id = ro.id " .
                "inner join Dictionary on objtype_id = dict_key natural join Chapter " .
                "where chapter_name = 'RackObjectType' order by ctime desc";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = $result->fetchAll(PDO::FETCH_ASSOC);
        $result->closeCursor();
        return $ret;
}

// This function is used in renderRackspaceHistory()
function getOperationMolecules ($op_id = 0)
{
        if ($op_id <= 0)
        {
                showError ("Missing argument", __FUNCTION__);
                return;
        }
        $query = "select old_molecule_id, new_molecule_id from MountOperation where id = ${op_id}";
        $result = useSelectBlade ($query, __FUNCTION__);
        // We expect one row.
        $row = $result->fetch (PDO::FETCH_ASSOC);
        if ($row == NULL)
        {
                showError ("SQL query succeded, but returned no results.", __FUNCTION__);
                return;
        }
        $omid = $row['old_molecule_id'];
        $nmid = $row['new_molecule_id'];
        $result->closeCursor();
        return array ($omid, $nmid);
}

function getResidentRacksData ($object_id = 0, $fetch_rackdata = TRUE)
{
        if ($object_id <= 0)
        {
                showError ('Invalid object_id', __FUNCTION__);
                return;
        }
        $query = "select distinct rack_id from RackSpace where object_id = ${object_id} order by rack_id";
        $result = useSelectBlade ($query, __FUNCTION__);
        $rows = $result->fetchAll (PDO::FETCH_NUM);
        $result->closeCursor();
        $ret = array();
        foreach ($rows as $row)
        {
                if (!$fetch_rackdata)
                {
                        $ret[$row[0]] = $row[0];
                        continue;
                }
                $rackData = getRackData ($row[0]);
                if ($rackData == NULL)
                {
                        showError ('getRackData() failed', __FUNCTION__);
                        return NULL;
                }
                $ret[$row[0]] = $rackData;
        }
        $result->closeCursor();
        return $ret;
}

function getObjectGroupInfo ()
{
        $query =
                'select dict_key as id, dict_value as name, count(id) as count from ' .
                'Dictionary natural join Chapter left join RackObject on dict_key = objtype_id ' .
                'where chapter_name = "RackObjectType" ' .
                'group by dict_key order by dict_value';
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $ret[0] = array ('id' => 0, 'name' => 'ALL types');
        $clist = array ('id', 'name', 'count');
        $total = 0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                if ($row['count'] > 0)
                {
                        $total += $row['count'];
                        foreach ($clist as $cname)
                                $ret[$row['id']][$cname] = $row[$cname];
                }
        $result->closeCursor();
        $ret[0]['count'] = $total;
        return $ret;
}

// This function returns objects, which have no rackspace assigned to them.
// Additionally it keeps rack_id parameter, so we can silently pre-select
// the rack required.
function getUnmountedObjects ()
{
        $query =
                'select dict_value as objtype_name, dict_key as objtype_id, name, label, barcode, id, asset_no from ' .
                'RackObject inner join Dictionary on objtype_id = dict_key natural join Chapter ' .
                'left join RackSpace on id = object_id '.
                'where rack_id is null and chapter_name = "RackObjectType" order by dict_value, name, label, asset_no, barcode';
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $clist = array ('id', 'name', 'label', 'barcode', 'objtype_name', 'objtype_id', 'asset_no');
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                foreach ($clist as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
                $ret[$row['id']]['dname'] = displayedName ($ret[$row['id']]);
        }
        $result->closeCursor();
        return $ret;
}

function getProblematicObjects ()
{
        $query =
                'select dict_value as objtype_name, dict_key as objtype_id, name, id, asset_no from ' .
                'RackObject inner join Dictionary on objtype_id = dict_key natural join Chapter '.
                'where has_problems = "yes" and chapter_name = "RackObjectType" order by objtype_name, name';
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $clist = array ('id', 'name', 'objtype_name', 'objtype_id', 'asset_no');
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                foreach ($clist as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
                $ret[$row['id']]['dname'] = displayedName ($ret[$row['id']]);
        }
        $result->closeCursor();
        return $ret;
}

function commitAddPort ($object_id = 0, $port_name, $port_type_id, $port_label, $port_l2address)
{
        if ($object_id <= 0)
        {
                showError ('Invalid object_id', __FUNCTION__);
                return;
        }
        $port_l2address = l2addressForDatabase ($port_l2address);
        $result = useInsertBlade
        (
                'Port',
                array
                (
                        'name' => "'${port_name}'",
                        'object_id' => "'${object_id}'",
                        'label' => "'${port_label}'",
                        'type' => "'${port_type_id}'",
                        'l2address' => "${port_l2address}"
                )
        );
        if ($result)
                return '';
        else
                return 'SQL query failed';
}

// The fifth argument may be either explicit 'NULL' or some (already quoted by the upper layer)
// string value. In case it is omitted, we just assign it its current value.
// It would be nice to simplify this semantics later.
function commitUpdatePort ($port_id, $port_name, $port_label, $port_l2address, $port_reservation_comment = 'reservation_comment')
{
        global $dbxlink;
        $port_l2address = l2addressForDatabase ($port_l2address);
        $query =
                "update Port set name='$port_name', label='$port_label', " .
                "reservation_comment = ${port_reservation_comment}, l2address=${port_l2address} " .
                "where id='$port_id'";
        $result = $dbxlink->exec ($query);
        if ($result == 1)
                return '';
        $errorInfo = $dbxlink->errorInfo();
        // We could update nothing.
        if ($errorInfo[0] == '00000')
                return '';
        return $errorInfo[2];
}

function delObjectPort ($port_id)
{
        if (unlinkPort ($port_id) != '')
                return __FUNCTION__ . ': unlinkPort() failed';
        if (useDeleteBlade ('Port', 'id', $port_id) != TRUE)
                return __FUNCTION__ . ': useDeleteBlade() failed';
        return '';
}

function getAllIPv4Allocations ()
{
        $query =
                "select object_id as object_id, ".
                "RackObject.name as object_name, ".
                "IPBonds.name as name, ".
                "INET_NTOA(ip) as ip ".
                "from IPBonds join RackObject on id=object_id ";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $count=0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ret[$count]['object_id']=$row['object_id'];
                $ret[$count]['object_name']=$row['object_name'];
                $ret[$count]['name']=$row['name'];
                $ret[$count]['ip']=$row['ip'];
                $count++;
        }
        $result->closeCursor();
        return $ret;
}

function getEmptyPortsOfType ($type_id)
{
        $query =
                "select distinct Port.id as Port_id, ".
                "Port.object_id as Port_object_id, ".
                "RackObject.name as Object_name, ".
                "Port.name as Port_name, ".
                "Port.type as Port_type_id, ".
                "dict_value as Port_type_name ".
                "from ( ".
                "       ( ".
                "               Port inner join Dictionary on Port.type = dict_key natural join Chapter ".
                "       ) ".
                "       join RackObject on Port.object_id = RackObject.id ".
                ") ".
                "left join Link on Port.id=Link.porta or Port.id=Link.portb ".
                "inner join PortCompat on Port.type = PortCompat.type2 ".
                "where chapter_name = 'PortType' and PortCompat.type1 = '$type_id' and Link.porta is NULL ".
                "and Port.reservation_comment is null order by Object_name, Port_name";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $count=0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ret[$count]['Port_id']=$row['Port_id'];
                $ret[$count]['Port_object_id']=$row['Port_object_id'];
                $ret[$count]['Object_name']=$row['Object_name'];
                $ret[$count]['Port_name']=$row['Port_name'];
                $ret[$count]['Port_type_id']=$row['Port_type_id'];
                $ret[$count]['Port_type_name']=$row['Port_type_name'];
                $count++;
        }
        $result->closeCursor();
        return $ret;
}

function linkPorts ($porta, $portb)
{
        if ($porta == $portb)
                return "Ports can't be the same";
        if ($porta > $portb)
        {
                $tmp = $porta;
                $porta = $portb;
                $portb = $tmp;
        }
        global $dbxlink;
        $query1 = "insert into Link set porta='${porta}', portb='{$portb}'";
        $query2 = "update Port set reservation_comment = NULL where id = ${porta} or id = ${portb} limit 2";
        // FIXME: who cares about the return value?
        $result = $dbxlink->exec ($query1);
        $result = $dbxlink->exec ($query2);
        return '';
}

function unlinkPort ($port)
{
        global $dbxlink;
        $query =
                "delete from Link where porta='$port' or portb='$port'";
        $result = $dbxlink->exec ($query);
        return '';
}

// Return all IPv4 addresses allocated to the objects. Attach detailed
// info about address to each alocation records. Index result by dotted-quad
// address.
function getObjectIPv4Allocations ($object_id = 0)
{
        $ret = array();
        $query = 'select name as osif, type, inet_ntoa(ip) as dottedquad from IPBonds ' .
                "where object_id = ${object_id} " .
                'order by ip';
        $result = useSelectBlade ($query, __FUNCTION__);
        // don't spawn a sub-query with unfetched buffer, it may fail
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[$row['dottedquad']] = array ('osif' => $row['osif'], 'type' => $row['type']);
        unset ($result);
        foreach (array_keys ($ret) as $dottedquad)
                $ret[$dottedquad]['addrinfo'] = getIPv4Address ($dottedquad);
        return $ret;
}

// Return minimal IPv4 address, optionally with "ip" key set, if requested.
function constructIPv4Address ($dottedquad = NULL)
{
        $ret = array
        (
                'name' => '',
                'reserved' => 'no',
                'outpf' => array(),
                'inpf' => array(),
                'rslist' => array(),
                'allocs' => array(),
                'lblist' => array()
        );
        if ($dottedquad != NULL)
                $ret['ip'] = $dottedquad;
        return $ret;
}

// Check the range requested for meaningful IPv4 records, build them
// into a list and return. Return an empty list if nothing matched.
// Both arguments are expected in signed int32 form. The resulting list
// is keyed by uint32 form of each IP address, items aren't sorted.
function scanIPv4Space ($i32_first, $i32_last)
{
        $ret = array();
        $dnamechache = array();

        $db_first = sprintf ('%u', 0x00000000 + $i32_first);
        $db_last = sprintf ('%u', 0x00000000 + $i32_last);
        // 1. collect labels and reservations
        $query = "select INET_NTOA(ip) as ip, name, reserved from IPAddress ".
                "where ip between ${db_first} and ${db_last} and (reserved = 'yes' or name != '')";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ip_bin = ip2long ($row['ip']);
                if (!isset ($ret[$ip_bin]))
                        $ret[$ip_bin] = constructIPv4Address ($row['ip']);
                $ret[$ip_bin]['name'] = $row['name'];
                $ret[$ip_bin]['reserved'] = $row['reserved'];
        }
        unset ($result);

        // 2. check for allocations
        $query =
                "select INET_NTOA(ipb.ip) as ip, ro.id as object_id, " .
                "ro.name as object_name, ipb.name, ipb.type, objtype_id, " .
                "dict_value as objtype_name from " .
                "IPBonds as ipb inner join RackObject as ro on ipb.object_id = ro.id " .
                "left join Dictionary on objtype_id=dict_key natural join Chapter " .
                "where ip between ${db_first} and ${db_last} " .
                "and chapter_name = 'RackObjectType'" .
                "order by ipb.type, object_name";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ip_bin = ip2long ($row['ip']);
                if (!isset ($ret[$ip_bin]))
                        $ret[$ip_bin] = constructIPv4Address ($row['ip']);
                if (!isset ($dnamecache[$row['object_id']]))
                {
                        $quasiobject['name'] = $row['object_name'];
                        $quasiobject['objtype_id'] = $row['objtype_id'];
                        $quasiobject['objtype_name'] = $row['objtype_name'];
                        $dnamecache[$row['object_id']] = displayedName ($quasiobject);
                }
                $tmp = array();
                foreach (array ('object_id', 'type', 'name') as $cname)
                        $tmp[$cname] = $row[$cname];
                $tmp['object_name'] = $dnamecache[$row['object_id']];
                $ret[$ip_bin]['allocs'][] = $tmp;
        }
        unset ($result);

        // 3. look for virtual services and related LB 
        $query = "select vs_id, inet_ntoa(vip) as ip, vport, proto, vs.name, " .
                "object_id, objtype_id, ro.name as object_name, dict_value as objtype_name from " .
                "IPVirtualService as vs inner join IPLoadBalancer as lb on vs.id = lb.vs_id " .
                "inner join RackObject as ro on lb.object_id = ro.id " .
                "left join Dictionary on objtype_id=dict_key " .
                "natural join Chapter " .
                "where vip between ${db_first} and ${db_last} " .
                "and chapter_name = 'RackObjectType'" .
                "order by vport, proto, ro.name, object_id";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ip_bin = ip2long ($row['ip']);
                if (!isset ($ret[$ip_bin]))
                        $ret[$ip_bin] = constructIPv4Address ($row['ip']);
                if (!isset ($dnamecache[$row['object_id']]))
                {
                        $quasiobject['name'] = $row['object_name'];
                        $quasiobject['objtype_id'] = $row['objtype_id'];
                        $quasiobject['objtype_name'] = $row['objtype_name'];
                        $dnamecache[$row['object_id']] = displayedName ($quasiobject);
                }
                $tmp = array();
                foreach (array ('object_id', 'vport', 'proto', 'vs_id', 'name') as $cname)
                        $tmp[$cname] = $row[$cname];
                $tmp['object_name'] = $dnamecache[$row['object_id']];
                $tmp['vip'] = $row['ip'];
                $ret[$ip_bin]['lblist'][] = $tmp;
        }
        unset ($result);

        // 4. don't forget about real servers along with pools
        $query = "select inet_ntoa(rsip) as ip, inservice, rsport, rspool_id, rsp.name as rspool_name from " .
                "IPRealServer as rs inner join IPRSPool as rsp on rs.rspool_id = rsp.id " .
                "where rsip between ${db_first} and ${db_last} " .
                "order by ip, rsport, rspool_id";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ip_bin = ip2long ($row['ip']);
                if (!isset ($ret[$ip_bin]))
                        $ret[$ip_bin] = constructIPv4Address ($row['ip']);
                $tmp = array();
                foreach (array ('rspool_id', 'rsport', 'rspool_name', 'inservice') as $cname)
                        $tmp[$cname] = $row[$cname];
                $ret[$ip_bin]['rslist'][] = $tmp;
        }
        unset ($result);

        // 5. add NAT rules, part 1
        $query =
                "select " .
                "proto, " .
                "INET_NTOA(localip) as localip, " .
                "localport, " .
                "INET_NTOA(remoteip) as remoteip, " .
                "remoteport, " .
                "description " .
                "from PortForwarding " .
                "where remoteip between ${db_first} and ${db_last} or " .
                "localip between ${db_first} and ${db_last} " .
                "order by localip, localport, remoteip, remoteport, proto";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $remoteip_bin = ip2long ($row['remoteip']);
                $localip_bin = ip2long ($row['localip']);
                if ($i32_first <= $remoteip_bin and $remoteip_bin <= $i32_last)
                {
                        if (!isset ($ret[$remoteip_bin]))
                                $ret[$remoteip_bin] = constructIPv4Address ($row['remoteip']);
                        $ret[$remoteip_bin]['inpf'][] = $row;
                }
                if ($i32_first <= $localip_bin and $localip_bin <= $i32_last)
                {
                        if (!isset ($ret[$localip_bin]))
                                $ret[$localip_bin] = constructIPv4Address ($row['localip']);
                        $ret[$localip_bin]['outpf'][] = $row;
                }
        }
        return $ret;
}

// Return summary data about an IPv4 prefix, if it exists, or NULL otherwise.
function getIPv4NetworkInfo ($id = 0)
{
        if ($id <= 0)
        {
                showError ('Invalid arg', __FUNCTION__);
                return NULL;
        }
        $query = "select INET_NTOA(ip) as ip, mask, name ".
                "from IPRanges where id = $id";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = $result->fetch (PDO::FETCH_ASSOC);
        if ($ret == NULL)
                return NULL;
        unset ($result);
        $ret['id'] = $id;
        $ret['ip_bin'] = ip2long ($ret['ip']);
        $ret['mask_bin'] = binMaskFromDec ($ret['mask']);
        $ret['mask_bin_inv'] = binInvMaskFromDec ($ret['mask']);
        $ret['db_first'] = sprintf ('%u', 0x00000000 + $ret['ip_bin'] & $ret['mask_bin']);
        $ret['db_last'] = sprintf ('%u', 0x00000000 + $ret['ip_bin'] | ($ret['mask_bin_inv']));
        return $ret;
}

function getIPv4Network ($id = 0)
{
        $ret = getIPv4NetworkInfo ($id);
        if (!$ret)
        {
                showError ('Record not found', __FUNCTION__);
                return NULL;
        }
        $ret['addrlist'] = scanIPv4Space ($ret['db_first'], $ret['db_last']);
        markupIPv4AddrList ($ret['addrlist']);
        return $ret;
}

function getIPv4Address ($dottedquad = '')
{
        if ($dottedquad == '')
        {
                showError ('Invalid arg', __FUNCTION__);
                return NULL;
        }
        $i32 = ip2long ($dottedquad); // signed 32 bit
        $scanres = scanIPv4Space ($i32, $i32);
        if (!isset ($scanres[$i32]))
                return constructIPv4Address ($dottedquad);
        markupIPv4AddrList ($scanres);
        return $scanres[$i32];
}

function bindIpToObject ($ip = '', $object_id = 0, $name = '', $type = '')
{
        $result = useInsertBlade
        (
                'IPBonds',
                array
                (
                        'ip' => "INET_ATON('$ip')",
                        'object_id' => "'${object_id}'",
                        'name' => "'${name}'",
                        'type' => "'${type}'"
                )
        );
        return $result ? '' : (__FUNCTION__ . '(): useInsertBlade() failed');
}

function getAddressspaceList ($tagfilter = array(), $tfmode = 'any')
{
        $whereclause = getWhereClause ($tagfilter);
        $query =
                "select distinct ".
                "id as IPRanges_id, ".
                "INET_NTOA(ip) as IPRanges_ip, ".
                "mask as IPRanges_mask, ".
                "name as IPRanges_name ".
                "from IPRanges left join TagStorage on IPRanges.id = TagStorage.target_id and target_realm = 'ipv4net' " .
                "where true ${whereclause} " .
                " order by ip";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret=array();
        $count=0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $ret[$count]['id'] = $row['IPRanges_id'];
                $ret[$count]['ip'] = $row['IPRanges_ip'];
                $ret[$count]['ip_bin'] = ip2long($row['IPRanges_ip']);
                $ret[$count]['name'] = $row['IPRanges_name'];
                $ret[$count]['mask'] = $row['IPRanges_mask'];
                $ret[$count]['mask_bin'] = binMaskFromDec($row['IPRanges_mask']);
                $ret[$count]['mask_bin_inv'] = binInvMaskFromDec($row['IPRanges_mask']);
                $count++;
        }
        $result->closeCursor();
        return $ret;

}

// Return the id of the smallest IPv4 network containing the given IPv4 address
// or NULL, if nothing was found.
function getIPv4AddressNetworkId ($dottedquad)
{
        $query = 'select id from IPRanges where ' .
                "inet_aton('${dottedquad}') & (4294967295 >> (32 - mask)) << (32 - mask) = ip " .
                'order by mask desc limit 1';
        $result = useSelectBlade ($query, __FUNCTION__);
        if ($row = $result->fetch (PDO::FETCH_ASSOC))
                return $row['id'];
        return NULL;
}

function updateRange ($id=0, $name='')
{
        global $dbxlink;
        $query =
                "update IPRanges set name='$name' where id='$id'";
        $result = $dbxlink->exec ($query);
        return '';
}

// This function is actually used not only to update, but also to create records,
// that's why ON DUPLICATE KEY UPDATE was replaced by DELETE-INSERT pair
// (MySQL 4.0 workaround).
function updateAddress ($ip = 0, $name = '', $reserved = 'no')
{
        // DELETE may safely fail.
        $r = useDeleteBlade ('IPAddress', 'ip', "INET_ATON('${ip}')");
        // INSERT may appear not necessary.
        if ($name == '' and $reserved == 'no')
                return '';
        if (useInsertBlade ('IPAddress', array ('name' => "'${name}'", 'reserved' => "'${reserved}'", 'ip' => "INET_ATON('${ip}')")))
                return '';
        else
                return __FUNCTION__ . '(): useInsertBlade() failed';
}

function updateBond ($ip='', $object_id=0, $name='', $type='')
{
        global $dbxlink;

        $query =
                "update IPBonds set name='$name', type='$type' where ip=INET_ATON('$ip') and object_id='$object_id'";
        $result = $dbxlink->exec ($query);
        return '';
}

function unbindIpFromObject ($ip='', $object_id=0)
{
        global $dbxlink;

        $query =
                "delete from IPBonds where ip=INET_ATON('$ip') and object_id='$object_id'";
        $result = $dbxlink->exec ($query);
        return '';
}

// This function returns either all or one user account. Array key is user name.
function getUserAccounts ($tagfilter = array(), $tfmode = 'any')
{
        $whereclause = getWhereClause ($tagfilter);
        $query =
                'select user_id, user_name, user_password_hash, user_realname, user_enabled ' .
                'from UserAccount left join TagStorage ' .
                "on UserAccount.user_id = TagStorage.target_id and target_realm = 'user' " .
                "where true ${whereclause} " .
                'order by user_name';
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        $clist = array ('user_id', 'user_name', 'user_realname', 'user_password_hash', 'user_enabled');
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach ($clist as $cname)
                        $ret[$row['user_name']][$cname] = $row[$cname];
        $result->closeCursor();
        return $ret;
}

function searchByl2address ($l2addr)
{
        $l2addr = l2addressForDatabase ($l2addr);
        $query = "select object_id, Port.id as port_id from RackObject as ro inner join Port on ro.id = Port.object_id " .
                "where l2address = ${l2addr}";
        $result = useSelectBlade ($query, __FUNCTION__);
        $rows = $result->fetchAll (PDO::FETCH_ASSOC);
        $result->closeCursor();
        if (count ($rows) == 0) // No results.
                return NULL;
        if (count ($rows) == 1) // Target found.
                return $rows[0];
        showError ('More than one results was found. This is probably a broken unique key.', __FUNCTION__);
        return NULL;
}

function getIPv4PrefixSearchResult ($terms)
{
        $query = "select id, inet_ntoa(ip) as ip, mask, name from IPRanges where ";
        $or = '';
        foreach (explode (' ', $terms) as $term)
        {
                $query .= $or . "name like '%${term}%'";
                $or = ' or ';
        }
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[] = $row;
        return $ret;
}

function getIPv4AddressSearchResult ($terms)
{
        $query = "select inet_ntoa(ip) as ip, name from IPAddress where ";
        $or = '';
        foreach (explode (' ', $terms) as $term)
        {
                $query .= $or . "name like '%${term}%'";
                $or = ' or ';
        }
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[] = $row;
        return $ret;
}

function getIPv4RSPoolSearchResult ($terms)
{
        $query = "select id as pool_id, name from IPRSPool where ";
        $or = '';
        foreach (explode (' ', $terms) as $term)
        {
                $query .= $or . "name like '%${term}%'";
                $or = ' or ';
        }
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[] = $row;
        return $ret;
}

function getIPv4VServiceSearchResult ($terms)
{
        $query = "select id, inet_ntoa(vip) as vip, vport, proto, name from IPVirtualService where ";
        $or = '';
        foreach (explode (' ', $terms) as $term)
        {
                $query .= $or . "name like '%${term}%'";
                $or = ' or ';
        }
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[] = $row;
        return $ret;
}

function getAccountSearchResult ($terms)
{
        return getSearchResultByField
        (
                'UserAccount',
                array ('user_id', 'user_name', 'user_realname'),
                'user_name',
                $terms,
                'user_name'
        );
}

function getSearchResultByField ($tname, $rcolumns, $scolumn, $terms, $ocolumn = '')
{
        $pfx = '';
        $query = 'select ';
        foreach ($rcolumns as $col)
        {
                $query .= $pfx . $col;
                $pfx = ', ';
        }
        $pfx = '';
        $query .= " from ${tname} where ";
        foreach (explode (' ', $terms) as $term)
        {
                $query .= $pfx . "${scolumn} like '%${term}%'";
                $pfx = ' or ';
        }
        if ($ocolumn != '')
                $query .= " order by ${ocolumn}";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[] = $row;
        return $ret;
}

// This function returns either port ID or NULL for specified arguments.
function getPortID ($object_id, $port_name)
{
        $query = "select id from Port where object_id=${object_id} and name='${port_name}' limit 2";
        $result = useSelectBlade ($query, __FUNCTION__);
        $rows = $result->fetchAll (PDO::FETCH_NUM);
        if (count ($rows) != 1)
                return NULL;
        $ret = $rows[0][0];
        $result->closeCursor();
        return $ret;
}

function commitCreateUserAccount ($username, $realname, $password)
{
        return useInsertBlade
        (
                'UserAccount',
                array
                (
                        'user_name' => "'${username}'",
                        'user_realname' => "'${realname}'",
                        'user_password_hash' => "'${password}'"
                )
        );
}

function commitUpdateUserAccount ($id, $new_username, $new_realname, $new_password)
{
        global $dbxlink;
        $query =
                "update UserAccount set user_name = '${new_username}', user_realname = '${new_realname}', " .
                "user_password_hash = '${new_password}' where user_id = ${id} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

function commitEnableUserAccount ($id, $new_enabled_value)
{
        global $dbxlink;
        $query =
                "update UserAccount set user_enabled = '${new_enabled_value}' " .
                "where user_id = ${id} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

// This function returns an array of all port type pairs from PortCompat table.
function getPortCompat ()
{
        $query =
                "select type1, type2, d1.dict_value as type1name, d2.dict_value as type2name from " .
                "PortCompat as pc inner join Dictionary as d1 on pc.type1 = d1.dict_key " .
                "inner join Dictionary as d2 on pc.type2 = d2.dict_key " .
                "inner join Chapter as c1 on d1.chapter_no = c1.chapter_no " .
                "inner join Chapter as c2 on d2.chapter_no = c2.chapter_no " .
                "where c1.chapter_name = 'PortType' and c2.chapter_name = 'PortType'";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = $result->fetchAll (PDO::FETCH_ASSOC);
        $result->closeCursor();
        return $ret;
}

function removePortCompat ($type1 = 0, $type2 = 0)
{
        global $dbxlink;
        if ($type1 == 0 or $type2 == 0)
        {
                showError ('Invalid arguments', __FUNCTION__);
                die;
        }
        $query = "delete from PortCompat where type1 = ${type1} and type2 = ${type2} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

function addPortCompat ($type1 = 0, $type2 = 0)
{
        if ($type1 <= 0 or $type2 <= 0)
        {
                showError ('Invalid arguments', __FUNCTION__);
                die;
        }
        return useInsertBlade
        (
                'PortCompat',
                array ('type1' => $type1, 'type2' => $type2)
        );
}

// This function returns the dictionary as an array of trees, each tree
// representing a single chapter. Each element has 'id', 'name', 'sticky'
// and 'word' keys with the latter holding all the words within the chapter.
function getDict ($parse_links = FALSE)
{
        $query1 =
                "select chapter_name, Chapter.chapter_no, dict_key, dict_value, sticky from " .
                "Chapter natural left join Dictionary order by chapter_name, dict_value";
        $result = useSelectBlade ($query1, __FUNCTION__);
        $dict = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $chapter_no = $row['chapter_no'];
                if (!isset ($dict[$chapter_no]))
                {
                        $dict[$chapter_no]['no'] = $chapter_no;
                        $dict[$chapter_no]['name'] = $row['chapter_name'];
                        $dict[$chapter_no]['sticky'] = $row['sticky'] == 'yes' ? TRUE : FALSE;
                        $dict[$chapter_no]['word'] = array();
                }
                if ($row['dict_key'] != NULL)
                {
                        $dict[$chapter_no]['word'][$row['dict_key']] = $parse_links ?
                                parseWikiLink ($row['dict_value'], 'a') : $row['dict_value'];
                        $dict[$chapter_no]['refcnt'][$row['dict_key']] = 0;
                }
        }
        $result->closeCursor();
        unset ($result);
// Find the list of all assigned values of dictionary-addressed attributes, each with
// chapter/word keyed reference counters. Use the structure to adjust reference counters
// of the returned disctionary words.
        $query2 = "select a.attr_id, am.chapter_no, uint_value, count(object_id) as refcnt " .
                "from Attribute as a inner join AttributeMap as am on a.attr_id = am.attr_id " .
                "inner join AttributeValue as av on a.attr_id = av.attr_id " .
                "inner join Dictionary as d on am.chapter_no = d.chapter_no and av.uint_value = d.dict_key " .
                "where attr_type = 'dict' group by a.attr_id, am.chapter_no, uint_value " .
                "order by a.attr_id, am.chapter_no, uint_value";
        $result = useSelectBlade ($query2, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $dict[$row['chapter_no']]['refcnt'][$row['uint_value']] = $row['refcnt'];
        $result->closeCursor();
        return $dict;
}

function getDictStats ()
{
        $stock_chapters = array (1, 2, 3, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23);
        $query =
                "select Chapter.chapter_no, chapter_name, count(dict_key) as wc from " .
                "Chapter natural left join Dictionary group by Chapter.chapter_no";
        $result = useSelectBlade ($query, __FUNCTION__);
        $tc = $tw = $uc = $uw = 0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $tc++;
                $tw += $row['wc'];;
                if (in_array ($row['chapter_no'], $stock_chapters))
                        continue;
                $uc++;
                $uw += $row['wc'];;
        }
        $result->closeCursor();
        unset ($result);
        $query = "select count(attr_id) as attrc from RackObject as ro left join " .
                "AttributeValue as av on ro.id = av.object_id group by ro.id";
        $result = useSelectBlade ($query, __FUNCTION__);
        $to = $ta = $so = 0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $to++;
                if ($row['attrc'] != 0)
                {
                        $so++;
                        $ta += $row['attrc'];
                }
        }
        $result->closeCursor();
        $ret = array();
        $ret['Total chapters in dictionary'] = $tc;
        $ret['Total words in dictionary'] = $tw;
        $ret['User chapters'] = $uc;
        $ret['Words in user chapters'] = $uw;
        $ret['Total objects'] = $to;
        $ret['Objects with stickers'] = $so;
        $ret['Total stickers attached']  = $ta;
        return $ret;
}

function getIPv4Stats()
{
        $ret = array();
        $subject = array();
        $subject[] = array ('q' => 'select count(id) from IPRanges', 'txt' => 'Networks');
        $subject[] = array ('q' => 'select count(ip) from IPAddress', 'txt' => 'Addresses commented/reserved');
        $subject[] = array ('q' => 'select count(ip) from IPBonds', 'txt' => 'Addresses allocated');
        $subject[] = array ('q' => 'select count(*) from PortForwarding', 'txt' => 'NAT rules');
        $subject[] = array ('q' => 'select count(id) from IPVirtualService', 'txt' => 'Virtual services');
        $subject[] = array ('q' => 'select count(id) from IPRSPool', 'txt' => 'Real server pools');
        $subject[] = array ('q' => 'select count(id) from IPRealServer', 'txt' => 'Real servers');
        $subject[] = array ('q' => 'select count(distinct object_id) from IPLoadBalancer', 'txt' => 'Load balancers');

        foreach ($subject as $item)
        {
                $result = useSelectBlade ($item['q'], __FUNCTION__);
                $row = $result->fetch (PDO::FETCH_NUM);
                $ret[$item['txt']] = $row[0];
                $result->closeCursor();
                unset ($result);
        }
        return $ret;
}

function getRackspaceStats()
{
        $ret = array();
        $subject = array();
        $subject[] = array ('q' => 'select count(*) from Dictionary where chapter_no = 3', 'txt' => 'Rack rows');
        $subject[] = array ('q' => 'select count(*) from Rack', 'txt' => 'Racks');
        $subject[] = array ('q' => 'select avg(height) from Rack', 'txt' => 'Average rack height');
        $subject[] = array ('q' => 'select sum(height) from Rack', 'txt' => 'Total rack units in field');

        foreach ($subject as $item)
        {
                $result = useSelectBlade ($item['q'], __FUNCTION__);
                $row = $result->fetch (PDO::FETCH_NUM);
                $ret[$item['txt']] = empty ($row[0]) ? 0 : $row[0];
                $result->closeCursor();
                unset ($result);
        }
        return $ret;
}

function getTagStats ()
{
        $ret = array();
        $query = "select tag, count(tag_id) as refcnt from " .
                "TagTree inner join TagStorage on TagTree.id = TagStorage.tag_id " .
                "group by tag_id order by refcnt desc";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[$row['tag']] = $row['refcnt'];
        $result->closeCursor();
        return $ret;
}

function commitUpdateDictionary ($chapter_no = 0, $dict_key = 0, $dict_value = '')
{
        if ($chapter_no <= 0 or $dict_key <= 0 or empty ($dict_value))
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "update Dictionary set dict_value = '${dict_value}' where chapter_no=${chapter_no} " .
                "and dict_key=${dict_key} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

function commitSupplementDictionary ($chapter_no = 0, $dict_value = '')
{
        if ($chapter_no <= 0 or empty ($dict_value))
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        return useInsertBlade
        (
                'Dictionary',
                array ('chapter_no' => $chapter_no, 'dict_value' => "'${dict_value}'")
        );
}

function commitReduceDictionary ($chapter_no = 0, $dict_key = 0)
{
        if ($chapter_no <= 0 or $dict_key <= 0)
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "delete from Dictionary where chapter_no=${chapter_no} " .
                "and dict_key=${dict_key} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

function commitAddChapter ($chapter_name = '')
{
        if (empty ($chapter_name))
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        return useInsertBlade
        (
                'Chapter',
                array ('chapter_name' => "'${chapter_name}'")
        );
}

function commitUpdateChapter ($chapter_no = 0, $chapter_name = '')
{
        if ($chapter_no <= 0 or empty ($chapter_name))
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "update Chapter set chapter_name = '${chapter_name}' where chapter_no = ${chapter_no} " .
                "and sticky = 'no' limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

function commitDeleteChapter ($chapter_no = 0)
{
        if ($chapter_no <= 0)
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "delete from Chapter where chapter_no = ${chapter_no} and sticky = 'no' limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

// This is a dictionary accessor. We perform link rendering, so the user sees
// nice <select> drop-downs.
function readChapter ($chapter_name = '')
{
        if (empty ($chapter_name))
        {
                showError ('invalid argument', __FUNCTION__);
                return NULL;
        }
        $query =
                "select dict_key, dict_value from Dictionary natural join Chapter " .
                "where chapter_name = '${chapter_name}'";
        $result = useSelectBlade ($query, __FUNCTION__);
        $chapter = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $chapter[$row['dict_key']] = parseWikiLink ($row['dict_value'], 'o');
        $result->closeCursor();
        // SQL ORDER BY had no sense, because we need to sort after link rendering, not before.
        asort ($chapter);
        return $chapter;
}

function getAttrMap ()
{
        $query =
                "select a.attr_id, a.attr_type, a.attr_name, am.objtype_id, " .
                "d.dict_value as objtype_name, am.chapter_no, c2.chapter_name from " .
                "Attribute as a natural left join AttributeMap as am " .
                "left join Dictionary as d on am.objtype_id = d.dict_key " .
                "left join Chapter as c1 on d.chapter_no = c1.chapter_no " .
                "left join Chapter as c2 on am.chapter_no = c2.chapter_no " .
                "where c1.chapter_name = 'RackObjectType' or c1.chapter_name is null " .
                "order by attr_name";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $attr_id = $row['attr_id'];
                if (!isset ($ret[$attr_id]))
                {
                        $ret[$attr_id]['id'] = $attr_id;
                        $ret[$attr_id]['type'] = $row['attr_type'];
                        $ret[$attr_id]['name'] = $row['attr_name'];
                        $ret[$attr_id]['application'] = array();
                }
                if ($row['objtype_id'] == '')
                        continue;
                $application['objtype_id'] = $row['objtype_id'];
                $application['objtype_name'] = $row['objtype_name'];
                if ($row['attr_type'] == 'dict')
                {
                        $application['chapter_no'] = $row['chapter_no'];
                        $application['chapter_name'] = $row['chapter_name'];
                }
                $ret[$attr_id]['application'][] = $application;
        }
        $result->closeCursor();
        return $ret;
}

function commitUpdateAttribute ($attr_id = 0, $attr_name = '')
{
        if ($attr_id <= 0 or empty ($attr_name))
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "update Attribute set attr_name = '${attr_name}' " .
                "where attr_id = ${attr_id} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ("SQL query '${query}' failed", __FUNCTION__);
                die;
        }
        return TRUE;
}

function commitAddAttribute ($attr_name = '', $attr_type = '')
{
        if (empty ($attr_name))
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        switch ($attr_type)
        {
                case 'uint':
                case 'float':
                case 'string':
                case 'dict':
                        break;
                default:
                        showError ('Invalid args', __FUNCTION__);
                        die;
        }
        return useInsertBlade
        (
                'Attribute',
                array ('attr_name' => "'${attr_name}'", 'attr_type' => "'${attr_type}'")
        );
}

function commitDeleteAttribute ($attr_id = 0)
{
        if ($attr_id <= 0)
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        return useDeleteBlade ('Attribute', 'attr_id', $attr_id);
}

// FIXME: don't store garbage in chapter_no for non-dictionary types.
function commitSupplementAttrMap ($attr_id = 0, $objtype_id = 0, $chapter_no = 0)
{
        if ($attr_id <= 0 or $objtype_id <= 0 or $chapter_no <= 0)
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        return useInsertBlade
        (
                'AttributeMap',
                array
                (
                        'attr_id' => $attr_id,
                        'objtype_id' => $objtype_id,
                        'chapter_no' => $chapter_no
                )
        );
}

function commitReduceAttrMap ($attr_id = 0, $objtype_id)
{
        if ($attr_id <= 0 or $objtype_id <= 0)
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "delete from AttributeMap where attr_id=${attr_id} " .
                "and objtype_id=${objtype_id} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

// This function returns all optional attributes for requested object
// as an array of records. NULL is returned on error and empty array
// is returned, if there are no attributes found.
function getAttrValues ($object_id, $strip_optgroup = FALSE)
{
        if ($object_id <= 0)
        {
                showError ('Invalid argument', __FUNCTION__);
                return NULL;
        }
        $ret = array();
        $query =
                "select A.attr_id, A.attr_name, A.attr_type, C.chapter_name, " .
                "AV.uint_value, AV.float_value, AV.string_value, D.dict_value from " .
                "RackObject as RO inner join AttributeMap as AM on RO.objtype_id = AM.objtype_id " .
                "inner join Attribute as A using (attr_id) " .
                "left join AttributeValue as AV on AV.attr_id = AM.attr_id and AV.object_id = RO.id " .
                "left join Dictionary as D on D.dict_key = AV.uint_value and AM.chapter_no = D.chapter_no " .
                "left join Chapter as C on AM.chapter_no = C.chapter_no " .
                "where RO.id = ${object_id} order by A.attr_type, A.attr_name";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $record = array();
                $record['id'] = $row['attr_id'];
                $record['name'] = $row['attr_name'];
                $record['type'] = $row['attr_type'];
                switch ($row['attr_type'])
                {
                        case 'uint':
                        case 'float':
                        case 'string':
                                $record['value'] = $row[$row['attr_type'] . '_value'];
                                $record['a_value'] = parseWikiLink ($record['value'], 'a');
                                break;
                        case 'dict':
                                $record['value'] = parseWikiLink ($row[$row['attr_type'] . '_value'], 'o', $strip_optgroup);
                                $record['a_value'] = parseWikiLink ($row[$row['attr_type'] . '_value'], 'a', $strip_optgroup);
                                $record['chapter_name'] = $row['chapter_name'];
                                $record['key'] = $row['uint_value'];
                                break;
                        default:
                                $record['value'] = NULL;
                                break;
                }
                $ret[$row['attr_id']] = $record;
        }
        $result->closeCursor();
        return $ret;
}

function commitResetAttrValue ($object_id = 0, $attr_id = 0)
{
        if ($object_id <= 0 or $attr_id <= 0)
        {
                showError ('Invalid arguments', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query = "delete from AttributeValue where object_id = ${object_id} and attr_id = ${attr_id} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ('SQL query failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

// FIXME: don't share common code with use commitResetAttrValue()
function commitUpdateAttrValue ($object_id = 0, $attr_id = 0, $value = '')
{
        if ($object_id <= 0 or $attr_id <= 0)
        {
                showError ('Invalid arguments', __FUNCTION__);
                die;
        }
        if (empty ($value))
                return commitResetAttrValue ($object_id, $attr_id);
        global $dbxlink;
        $query1 = "select attr_type from Attribute where attr_id = ${attr_id}";
        $result = $dbxlink->query ($query1);
        if ($result == NULL)
        {
                showError ('SQL query #1 failed', __FUNCTION__);
                die;
        }
        $row = $result->fetch (PDO::FETCH_NUM);
        if ($row == NULL)
        {
                showError ('SQL query #1 returned no results', __FUNCTION__);
                die;
        }
        $attr_type = $row[0];
        $result->closeCursor();
        switch ($attr_type)
        {
                case 'uint':
                case 'float':
                case 'string':
                        $column = $attr_type . '_value';
                        break;
                case 'dict':
                        $column = 'uint_value';
                        break;
                default:
                        showError ("Unknown attribute type '${attr_type}' met", __FUNCTION__);
                        die;
        }
        $query2 =
                "delete from AttributeValue where " .
                "object_id = ${object_id} and attr_id = ${attr_id} limit 1";
        $result = $dbxlink->query ($query2);
        if ($result == NULL)
        {
                showError ('SQL query #2 failed', __FUNCTION__);
                die;
        }
        // We know $value isn't empty here.
        $query3 =
                "insert into AttributeValue set ${column} = '${value}', " .
                "object_id = ${object_id}, attr_id = ${attr_id} ";
        $result = $dbxlink->query ($query3);
        if ($result == NULL)
        {
                showError ('SQL query #3 failed', __FUNCTION__);
                die;
        }
        return TRUE;
}

function commitUseupPort ($port_id = 0)
{
        if ($port_id <= 0)
        {
                showError ("Invalid argument", __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query = "update Port set reservation_comment = NULL where id = ${port_id} limit 1";
        $result = $dbxlink->exec ($query);
        if ($result == NULL)
        {
                showError ("SQL query failed", __FUNCTION__);
                die;
        }
        return TRUE;
        
}

// This is a swiss-knife blade to insert a record into a table.
// The first argument is table name.
// The second argument is an array of "name" => "value" pairs.
// The function returns either TRUE or FALSE (we expect one row
// to be inserted).
function useInsertBlade ($tablename, $values)
{
        global $dbxlink;
        $namelist = $valuelist = '';
        foreach ($values as $name => $value)
        {
                $namelist = $namelist . ($namelist == '' ? "(${name}" : ", ${name}");
                $valuelist = $valuelist . ($valuelist == '' ? "(${value}" : ", ${value}");
        }
        $query = "insert into ${tablename} ${namelist}) values ${valuelist})";
        $result = $dbxlink->exec ($query);
        if ($result != 1)
                return FALSE;
        return TRUE;
}

// This swiss-knife blade deletes one record from the specified table
// using the specified key name and value.
function useDeleteBlade ($tablename, $keyname, $keyvalue)
{
        global $dbxlink;
        return 1 === $dbxlink->exec ("delete from ${tablename} where ${keyname}=${keyvalue} limit 1");
}

function useSelectBlade ($query, $caller = 'N/A')
{
        global $dbxlink;
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                $ei = $dbxlink->errorInfo();
                showError ("SQL query '${query}'\n failed in useSelectBlade with error ${ei[1]} (${ei[2]})", $caller);
                return NULL;
        }
        return $result;
}

function loadConfigCache ()
{
        $query = 'SELECT varname, varvalue, vartype, is_hidden, emptyok, description FROM Config ORDER BY varname';
        $result = useSelectBlade ($query, __FUNCTION__);
        $cache = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $cache[$row['varname']] = $row;
        $result->closeCursor();
        return $cache;
}

// setConfigVar() is expected to perform all necessary filtering
function storeConfigVar ($varname = NULL, $varvalue = NULL)
{
        global $dbxlink;
        if (empty ($varname) || $varvalue === NULL)
        {
                showError ('Invalid arguments', __FUNCTION__);
                return FALSE;
        }
        $query = "update Config set varvalue='${varvalue}' where varname='${varname}' limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ("SQL query '${query}' failed", __FUNCTION__);
                return FALSE;
        }
        $rc = $result->rowCount();
        $result->closeCursor();
        if ($rc == 0 or $rc == 1)
                return TRUE;
        showError ("Something went wrong for args '${varname}', '${varvalue}'", __FUNCTION__);
        return FALSE;
}

// Database version detector. Should behave corretly on any
// working dataset a user might have.
function getDatabaseVersion ()
{
        global $dbxlink;
        $query = "select varvalue from Config where varname = 'DB_VERSION' and vartype = 'string'";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                $errorInfo = $dbxlink->errorInfo();
                if ($errorInfo[0] == '42S02') // ER_NO_SUCH_TABLE
                        return '0.14.4';
                die (__FUNCTION__ . ': SQL query #1 failed with error ' . $errorInfo[2]);
        }
        $rows = $result->fetchAll (PDO::FETCH_NUM);
        if (count ($rows) != 1 || empty ($rows[0][0]))
        {
                $result->closeCursor();
                die (__FUNCTION__ . ': Cannot guess database version. Config table is present, but DB_VERSION is missing or invalid. Giving up.');
        }
        $ret = $rows[0][0];
        $result->closeCursor();
        return $ret;
}

// Return an array of virtual services. For each of them list real server pools
// with their load balancers and other stats.
function getSLBSummary ()
{
        $query = 'select vs.id as vsid, inet_ntoa(vip) as vip, vport, proto, vs.name, object_id, ' .
                'lb.rspool_id, pool.name as pool_name, count(rs.id) as rscount ' .
                'from IPVirtualService as vs inner join IPLoadBalancer as lb on vs.id = lb.vs_id ' .
                'inner join IPRSPool as pool on lb.rspool_id = pool.id ' .
                'left join IPRealServer as rs on rs.rspool_id = lb.rspool_id ' .
                'group by vs.id, object_id order by vs.vip, object_id';
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $vsid = $row['vsid'];
                $object_id = $row['object_id'];
                if (!isset ($ret[$vsid]))
                {
                        $ret[$vsid] = array();
                        foreach (array ('vip', 'vport', 'proto', 'name') as $cname)
                                $ret[$vsid][$cname] = $row[$cname];
                        $ret[$vsid]['lblist'] = array();
                }
                // There's only one assigned RS pool possible for each LB-VS combination.
                $ret[$vsid]['lblist'][$row['object_id']] = array
                (
                        'id' => $row['rspool_id'],
                        'size' => $row['rscount'],
                        'name' => $row['pool_name']
                );
        }
        $result->closeCursor();
        return $ret;
}

// Get the detailed composition of a particular virtual service, namely the list
// of all pools, each shown with the list of objects servicing it. VS/RS configs
// will be returned as well.
function getVServiceInfo ($vsid = 0)
{
        $query1 = "select inet_ntoa(vip) as vip, vport, proto, name, vsconfig, rsconfig " .
                "from IPVirtualService where id = ${vsid}";
        $result = useSelectBlade ($query1, __FUNCTION__);
        $vsinfo = array ();
        $row = $result->fetch (PDO::FETCH_ASSOC);
        if (!$row)
                return NULL;
        foreach (array ('vip', 'vport', 'proto', 'name', 'vsconfig', 'rsconfig') as $cname)
                $vsinfo[$cname] = $row[$cname];
        $vsinfo['rspool'] = array();
        $result->closeCursor();
        unset ($result);
        $query2 = "select pool.id, name, pool.vsconfig, pool.rsconfig, object_id, " .
                "lb.vsconfig as lb_vsconfig, lb.rsconfig as lb_rsconfig from " .
                "IPRSPool as pool left join IPLoadBalancer as lb on pool.id = lb.rspool_id " .
                "where vs_id = ${vsid} order by pool.name, object_id";
        $result = useSelectBlade ($query2, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                if (!isset ($vsinfo['rspool'][$row['id']]))
                {
                        $vsinfo['rspool'][$row['id']]['name'] = $row['name'];
                        $vsinfo['rspool'][$row['id']]['vsconfig'] = $row['vsconfig'];
                        $vsinfo['rspool'][$row['id']]['rsconfig'] = $row['rsconfig'];
                        $vsinfo['rspool'][$row['id']]['lblist'] = array();
                }
                if ($row['object_id'] == NULL)
                        continue;
                $vsinfo['rspool'][$row['id']]['lblist'][$row['object_id']] = array
                (
                        'vsconfig' => $row['lb_vsconfig'],
                        'rsconfig' => $row['lb_rsconfig']
                );
        }
        $result->closeCursor();
        return $vsinfo;
}

// Collect and return the following info about the given real server pool:
// basic information
// parent virtual service information
// load balancers list (each with a list of VSes)
// real servers list

function getRSPoolInfo ($id = 0)
{
        $query1 = "select id, name, vsconfig, rsconfig from " .
                "IPRSPool where id = ${id}";
        $result = useSelectBlade ($query1, __FUNCTION__);
        $ret = array();
        $row = $result->fetch (PDO::FETCH_ASSOC);
        if (!$row)
                return NULL;
        foreach (array ('id', 'name', 'vsconfig', 'rsconfig') as $c)
                $ret[$c] = $row[$c];
        $result->closeCursor();
        unset ($result);
        $ret['lblist'] = array();
        $ret['rslist'] = array();
        $query2 = "select object_id, vs_id, vsconfig, rsconfig from IPLoadBalancer " .
                "where rspool_id = ${id} order by object_id, vs_id";
        $result = useSelectBlade ($query2, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach (array ('vsconfig', 'rsconfig') as $c)
                        $ret['lblist'][$row['object_id']][$row['vs_id']][$c] = $row[$c];
        $result->closeCursor();
        unset ($result);
        $query3 = "select id, inservice, inet_ntoa(rsip) as rsip, rsport, rsconfig from " .
                "IPRealServer where rspool_id = ${id} order by IPRealServer.rsip, rsport";
        $result = useSelectBlade ($query3, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach (array ('inservice', 'rsip', 'rsport', 'rsconfig') as $c)
                        $ret['rslist'][$row['id']][$c] = $row[$c];
        $result->closeCursor();
        return $ret;
}

function addRStoRSPool ($pool_id = 0, $rsip = '', $rsport = 0, $inservice = 'no', $rsconfig = '')
{
        if ($pool_id <= 0 or $rsport <= 0)
        {
                showError ('Invalid arguments', __FUNCTION__);
                die;
        }
        return useInsertBlade
        (
                'IPRealServer',
                array
                (
                        'rsip' => "inet_aton('${rsip}')",
                        'rsport' => $rsport,
                        'rspool_id' => $pool_id,
                        'inservice' => ($inservice == 'yes' ? "'yes'" : "'no'"),
                        'rsconfig' => (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'")
                )
        );
}

function commitCreateVS ($vip = '', $vport = 0, $proto = '', $name = '', $vsconfig, $rsconfig, $taglist = array())
{
        if (empty ($vip) or $vport <= 0 or empty ($proto))
                return __FUNCTION__ . ': invalid arguments';
        if (!useInsertBlade
        (
                'IPVirtualService',
                array
                (
                        'vip' => "inet_aton('${vip}')",
                        'vport' => $vport,
                        'proto' => "'${proto}'",
                        'name' => (empty ($name) ? 'NULL' : "'${name}'"),
                        'vsconfig' => (empty ($vsconfig) ? 'NULL' : "'${vsconfig}'"),
                        'rsconfig' => (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'")
                )
        ))
                return __FUNCTION__ . ': SQL insertion failed';
        return produceTagsForLastRecord ('ipv4vs', $taglist);
}

function addLBtoRSPool ($pool_id = 0, $object_id = 0, $vs_id = 0, $vsconfig = '', $rsconfig = '')
{
        if ($pool_id <= 0 or $object_id <= 0 or $vs_id <= 0)
        {
                showError ('Invalid arguments', __FUNCTION__);
                die;
        }
        return useInsertBlade
        (
                'IPLoadBalancer',
                array
                (
                        'object_id' => $object_id,
                        'rspool_id' => $pool_id,
                        'vs_id' => $vs_id,
                        'vsconfig' => (empty ($vsconfig) ? 'NULL' : "'${vsconfig}'"),
                        'rsconfig' => (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'")
                )
        );
}

function commitDeleteRS ($id = 0)
{
        if ($id <= 0)
                return FALSE;
        return useDeleteBlade ('IPRealServer', 'id', $id);
}

function commitDeleteVS ($id = 0)
{
        if ($id <= 0)
                return FALSE;
        return useDeleteBlade ('IPVirtualService', 'id', $id) && destroyTagsForEntity ('ipv4vs', $id);
}

function commitDeleteLB ($object_id = 0, $pool_id = 0, $vs_id = 0)
{
        global $dbxlink;
        if ($object_id <= 0 or $pool_id <= 0 or $vs_id <= 0)
                return FALSE;
        $query = "delete from IPLoadBalancer where object_id = ${object_id} and " .
                "rspool_id = ${pool_id} and vs_id = ${vs_id} limit 1";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return FALSE;
        elseif ($result != 1)
                return FALSE;
        else
                return TRUE;
}

function commitUpdateRS ($rsid = 0, $rsip = '', $rsport = 0, $rsconfig = '')
{
        if ($rsid <= 0 or $rsport <= 0)
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        if (long2ip (ip2long ($rsip)) !== $rsip)
        {
                showError ("Invalid IP address '${rsip}'", __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "update IPRealServer set rsip = inet_aton('${rsip}'), rsport = ${rsport}, rsconfig = " .
                (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'") .
                " where id = ${rsid} limit 1";
        $result = $dbxlink->query ($query);
        if ($result == NULL)
        {
                showError ("SQL query '${query}' failed", __FUNCTION__);
                die;
        }
        return TRUE;
}

function commitUpdateLB ($object_id = 0, $pool_id = 0, $vs_id = 0, $vsconfig = '', $rsconfig = '')
{
        if ($object_id <= 0 or $pool_id <= 0 or $vs_id <= 0)
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query =
                "update IPLoadBalancer set vsconfig = " .
                (empty ($vsconfig) ? 'NULL' : "'${vsconfig}'") .
                ', rsconfig = ' .
                (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'") .
                " where object_id = ${object_id} and rspool_id = ${pool_id} " .
                "and vs_id = ${vs_id} limit 1";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return FALSE;
        else
                return TRUE;
}

function commitUpdateVS ($vsid = 0, $vip = '', $vport = 0, $proto = '', $name = '', $vsconfig = '', $rsconfig = '')
{
        if ($vsid <= 0 or empty ($vip) or $vport <= 0 or empty ($proto))
        {
                showError ('Invalid args', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query = "update IPVirtualService set " .
                "vip = inet_aton('${vip}'), " .
                "vport = ${vport}, " .
                "proto = '${proto}', " .
                'name = ' . (empty ($name) ? 'NULL,' : "'${name}', ") .
                'vsconfig = ' . (empty ($vsconfig) ? 'NULL,' : "'${vsconfig}', ") .
                'rsconfig = ' . (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'") .
                " where id = ${vsid} limit 1";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return FALSE;
        else
                return TRUE;
}

// Return the list of virtual services, indexed by vs_id.
// Each record will be shown with its basic info plus RS pools counter.
function getVSList ($tagfilter = array(), $tfmode = 'any')
{
        $whereclause = getWhereClause ($tagfilter);
        $query = "select vs.id, inet_ntoa(vip) as vip, vport, proto, vs.name, vs.vsconfig, vs.rsconfig, count(rspool_id) as poolcount " .
                "from IPVirtualService as vs left join IPLoadBalancer as lb on vs.id = lb.vs_id " .
                "left join TagStorage on vs.id = TagStorage.target_id and target_realm = 'ipv4vs' " . 
                "where true ${whereclause} group by vs.id order by vs.vip, proto, vport";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array ();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach (array ('vip', 'vport', 'proto', 'name', 'vsconfig', 'rsconfig', 'poolcount') as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
        $result->closeCursor();
        return $ret;
}

// Return the list of RS pool, indexed by pool id.
function getRSPoolList ($tagfilter = array(), $tfmode = 'any')
{
        $whereclause = getWhereClause ($tagfilter);
        $query = "select pool.id, pool.name, count(rspool_id) as refcnt, pool.vsconfig, pool.rsconfig " .
                "from IPRSPool as pool left join IPLoadBalancer as lb on pool.id = lb.rspool_id " .
                "left join TagStorage on pool.id = TagStorage.target_id and target_realm = 'ipv4rspool' " .
                "where true ${whereclause} group by pool.id order by pool.name, pool.id";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array ();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach (array ('name', 'refcnt', 'vsconfig', 'rsconfig') as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
        $result->closeCursor();
        return $ret;
}

function loadThumbCache ($rack_id = 0)
{
        $ret = NULL;
        $query = "select thumb_data from Rack where id = ${rack_id} and thumb_data is not null limit 1";
        $result = useSelectBlade ($query, __FUNCTION__);
        $row = $result->fetch (PDO::FETCH_ASSOC);
        if ($row)
                $ret = base64_decode ($row['thumb_data']);
        $result->closeCursor();
        return $ret;
}

function saveThumbCache ($rack_id = 0, $cache = NULL)
{
        global $dbxlink;
        if ($rack_id == 0 or $cache == NULL)
        {
                showError ('Invalid arguments', __FUNCTION__);
                return;
        }
        $data = base64_encode ($cache);
        $query = "update Rack set thumb_data = '${data}' where id = ${rack_id} limit 1";
        $result = $dbxlink->exec ($query);
}

function resetThumbCache ($rack_id = 0)
{
        global $dbxlink;
        if ($rack_id == 0)
        {
                showError ('Invalid argument', __FUNCTION__);
                return;
        }
        $query = "update Rack set thumb_data = NULL where id = ${rack_id} limit 1";
        $result = $dbxlink->exec ($query);
}

// Return the list of attached RS pools for the given object. As long as we have
// the LB-VS UNIQUE in IPLoadBalancer table, it is Ok to key returned records
// by vs_id, because there will be only one RS pool listed for each VS of the
// current object.
function getRSPoolsForObject ($object_id = 0)
{
        if ($object_id <= 0)
        {
                showError ('Invalid object_id', __FUNCTION__);
                return NULL;
        }
        $query = 'select vs_id, inet_ntoa(vip) as vip, vport, proto, vs.name, pool.id as pool_id, ' .
                'pool.name as pool_name, count(rsip) as rscount, lb.vsconfig, lb.rsconfig from ' .
                'IPLoadBalancer as lb inner join IPRSPool as pool on lb.rspool_id = pool.id ' .
                'inner join IPVirtualService as vs on lb.vs_id = vs.id ' .
                'left join IPRealServer as rs on lb.rspool_id = rs.rspool_id ' .
                "where lb.object_id = ${object_id} " .
                'group by lb.rspool_id, lb.vs_id order by vs.vip, vport, proto, pool.name';
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array ();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach (array ('vip', 'vport', 'proto', 'name', 'pool_id', 'pool_name', 'rscount', 'vsconfig', 'rsconfig') as $cname)
                        $ret[$row['vs_id']][$cname] = $row[$cname];
        $result->closeCursor();
        return $ret;
}

function commitCreateRSPool ($name = '', $vsconfig = '', $rsconfig = '', $taglist = array())
{
        if (empty ($name))
                return __FUNCTION__ . ': invalid arguments';
        if (!useInsertBlade
        (
                'IPRSPool',
                array
                (
                        'name' => (empty ($name) ? 'NULL' : "'${name}'"),
                        'vsconfig' => (empty ($vsconfig) ? 'NULL' : "'${vsconfig}'"),
                        'rsconfig' => (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'")
                )
        ))
                return __FUNCTION__ . ': SQL insertion failed';
        return produceTagsForLastRecord ('ipv4rspool', $taglist);
}

function commitDeleteRSPool ($pool_id = 0)
{
        global $dbxlink;
        if ($pool_id <= 0)
                return FALSE;
        return useDeleteBlade ('IPRSPool', 'id', $pool_id) && destroyTagsForEntity ('ipv4rspool', $pool_id);
}

function commitUpdateRSPool ($pool_id = 0, $name = '', $vsconfig = '', $rsconfig = '')
{
        if ($pool_id <= 0)
        {
                showError ('Invalid arg', __FUNCTION__);
                die;
        }
        global $dbxlink;
        $query = "update IPRSPool set " .
                'name = ' . (empty ($name) ? 'NULL,' : "'${name}', ") .
                'vsconfig = ' . (empty ($vsconfig) ? 'NULL,' : "'${vsconfig}', ") .
                'rsconfig = ' . (empty ($rsconfig) ? 'NULL' : "'${rsconfig}'") .
                " where id = ${pool_id} limit 1";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return FALSE;
        elseif ($result != 1)
                return FALSE;
        else
                return TRUE;
}

function getRSList ()
{
        $query = "select id, inservice, inet_ntoa(rsip) as rsip, rsport, rspool_id, rsconfig " .
                "from IPRealServer order by rspool_id, IPRealServer.rsip, rsport";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array ();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                foreach (array ('inservice', 'rsip', 'rsport', 'rspool_id', 'rsconfig') as $cname)
                        $ret[$row['id']][$cname] = $row[$cname];
        $result->closeCursor();
        return $ret;
}

// Return the list of all currently configured load balancers with their pool count.
function getLBList ()
{
        $query = "select object_id, count(rspool_id) as poolcount " .
                "from IPLoadBalancer group by object_id order by object_id";
        $result = useSelectBlade ($query, __FUNCTION__);
        $ret = array ();
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[$row['object_id']] = $row['poolcount'];
        $result->closeCursor();
        return $ret;
}

// For the given object return: it vsconfig/rsconfig; the list of RS pools
// attached (each with vsconfig/rsconfig in turn), each with the list of
// virtual services terminating the pool. Each pool also lists all real
// servers with rsconfig.
function getSLBConfig ($object_id)
{
        if ($object_id <= 0)
        {
                showError ('Invalid arg', __FUNCTION__);
                return NULL;
        }
        $ret = array();
        $query = 'select vs_id, inet_ntoa(vip) as vip, vport, proto, vs.name as vs_name, ' .
                'vs.vsconfig as vs_vsconfig, vs.rsconfig as vs_rsconfig, ' .
                'lb.vsconfig as lb_vsconfig, lb.rsconfig as lb_rsconfig, pool.id as pool_id, pool.name as pool_name, ' .
                'pool.vsconfig as pool_vsconfig, pool.rsconfig as pool_rsconfig, ' .
                'rs.id as rs_id, inet_ntoa(rsip) as rsip, rsport, rs.rsconfig as rs_rsconfig from ' .
                'IPLoadBalancer as lb inner join IPRSPool as pool on lb.rspool_id = pool.id ' .
                'inner join IPVirtualService as vs on lb.vs_id = vs.id ' .
                'inner join IPRealServer as rs on lb.rspool_id = rs.rspool_id ' .
                "where lb.object_id = ${object_id} and rs.inservice = 'yes' " .
                "order by vs.vip, vport, proto, pool.name, rs.rsip, rs.rsport";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $vs_id = $row['vs_id'];
                if (!isset ($ret[$vs_id]))
                {
                        foreach (array ('vip', 'vport', 'proto', 'vs_name', 'vs_vsconfig', 'vs_rsconfig', 'lb_vsconfig', 'lb_rsconfig', 'pool_vsconfig', 'pool_rsconfig', 'pool_id', 'pool_name') as $c)
                                $ret[$vs_id][$c] = $row[$c];
                        $ret[$vs_id]['rslist'] = array();
                }
                foreach (array ('rsip', 'rsport', 'rs_rsconfig') as $c)
                        $ret[$vs_id]['rslist'][$row['rs_id']][$c] = $row[$c];
        }
        $result->closeCursor();
        return $ret;
}

function commitSetInService ($rs_id = 0, $inservice = '')
{
        if ($rs_id <= 0 or empty ($inservice))
        {
                showError ('Invalid args', __FUNCTION__);
                return NULL;
        }
        global $dbxlink;
        $query = "update IPRealServer set inservice = '${inservice}' where id = ${rs_id} limit 1";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return FALSE;
        elseif ($result != 1)
                return FALSE;
        else
                return TRUE;
}

function executeAutoPorts ($object_id = 0, $type_id = 0)
{
        if ($object_id == 0 or $type_id == 0)
        {
                showError ('Invalid arguments', __FUNCTION__);
                die;
        }
        $ret = TRUE;
        foreach (getAutoPorts ($type_id) as $autoport)
                $ret = $ret and '' == commitAddPort ($object_id, $autoport['name'], $autoport['type'], '', '');
        return $ret;
}

// Return only implicitly listed tags, the rest of the chain will be
// generated/deducted later at higher levels.
// Result is a chain: randomly indexed taginfo list.
function loadEntityTags ($entity_realm = '', $entity_id = 0)
{
        if ($entity_realm == '' or $entity_id <= 0)
        {
                showError ('Invalid or missing arguments', __FUNCTION__);
                return NULL;
        }
        $ret = array();
        $query = "select tt.id, tag from " .
                "TagStorage as ts inner join TagTree as tt on ts.tag_id = tt.id " .
                "where target_realm = '${entity_realm}' and target_id = ${entity_id} " .
                "order by tt.tag";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
                $ret[$row['id']] = $row;
        $result->closeCursor();
        return getExplicitTagsOnly ($ret);
}

function loadRackObjectTags ($id)
{
        return loadEntityTags ('object', $id);
}

function loadIPv4PrefixTags ($id)
{
        return loadEntityTags ('ipv4net', $id);
}

function loadRackTags ($id)
{
        return loadEntityTags ('rack', $id);
}

function loadIPv4VSTags ($id)
{
        return loadEntityTags ('ipv4vs', $id);
}

function loadIPv4RSPoolTags ($id)
{
        return loadEntityTags ('ipv4rspool', $id);
}

function loadUserTags ($user_id)
{
        return loadEntityTags ('user', $user_id);
}

// Return a tag chain with all DB tags on it.
function getTagList ()
{
        $ret = array();
        $query = "select id, parent_id, tag, target_realm as realm, count(target_id) as refcnt " .
                "from TagTree left join TagStorage on id = tag_id " .
                "group by id, target_realm order by tag";
        $result = useSelectBlade ($query, __FUNCTION__);
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                if (!isset ($ret[$row['id']]))
                        $ret[$row['id']] = array
                        (
                                'id' => $row['id'],
                                'tag' => $row['tag'],
                                'parent_id' => $row['parent_id'],
                                'refcnt' => array()
                        );
                if ($row['realm'])
                        $ret[$row['id']]['refcnt'][$row['realm']] = $row['refcnt'];
        }
        $result->closeCursor();
        return $ret;
}

function commitCreateTag ($tagname = '', $parent_id = 0)
{
        if ($tagname == '' or $parent_id === 0)
                return "Invalid args to " . __FUNCTION__;
        $result = useInsertBlade
        (
                'TagTree',
                array
                (
                        'tag' => "'${tagname}'",
                        'parent_id' => $parent_id
                )
        );
        if ($result)
                return '';
        else
                return "SQL query failed in " . __FUNCTION__;
}

function commitDestroyTag ($tagid = 0)
{
        if ($tagid == 0)
                return 'Invalid arg to ' . __FUNCTION__;
        if (useDeleteBlade ('TagTree', 'id', $tagid))
                return '';
        else
                return 'useDeleteBlade() failed in ' . __FUNCTION__;
}

function commitUpdateTag ($tag_id, $tag_name, $parent_id)
{
        if ($parent_id == 0)
                $parent_id = 'NULL';
        global $dbxlink;
        $query = "update TagTree set tag = '${tag_name}', parent_id = ${parent_id} " .
                "where id = ${tag_id} limit 1";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return 'SQL query failed in ' . __FUNCTION__;
        return '';
}

// Drop the whole chain stored.
function destroyTagsForEntity ($entity_realm, $entity_id)
{
        global $dbxlink;
        $query = "delete from TagStorage where target_realm = '${entity_realm}' and target_id = ${entity_id}";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return FALSE;
        else
                return TRUE;
}

// Drop only one record. This operation doesn't involve retossing other tags, unlike when adding.
function deleteTagForEntity ($entity_realm, $entity_id, $tag_id)
{
        global $dbxlink;
        $query = "delete from TagStorage where target_realm = '${entity_realm}' and target_id = ${entity_id} and tag_id = ${tag_id}";
        $result = $dbxlink->exec ($query);
        if ($result === NULL)
                return FALSE;
        else
                return TRUE;
}

// Push a record into TagStorage unconditionally.
function addTagForEntity ($realm, $entity_id, $tag_id)
{
        return useInsertBlade
        (
                'TagStorage',
                array
                (
                        'target_realm' => "'${realm}'",
                        'target_id' => $entity_id,
                        'tag_id' => $tag_id,
                )
        );
}

// Add records into TagStorage, if this makes sense (IOW, they don't appear
// on the implicit list already). Then remove any other records, which
// appear on the "implicit" side of the chain. This will make sure,
// that both the tag base is still minimal and all requested tags appear on
// the resulting tag chain.
// Return TRUE, if any changes were committed.
function rebuildTagChainForEntity ($realm, $entity_id, $extrachain = array())
{
        // Put the current explicit sub-chain into a buffer and merge all tags from
        // the extra chain, which aren't there yet.
        $newchain = $oldchain = loadEntityTags ($realm, $entity_id);
        foreach ($extrachain as $extratag)
                if (!tagOnChain ($extratag, $newchain))
                        $newchain[] = $extratag;
        // Then minimize the working buffer and check if it differs from the original
        // chain we started with. If it is so, save the work and signal the upper layer.
        $newchain = getExplicitTagsOnly ($newchain);
        if (tagChainCmp ($oldchain, $newchain))
        {
                destroyTagsForEntity ($realm, $entity_id);
                foreach ($newchain as $taginfo)
                        addTagForEntity ($realm, $entity_id, $taginfo['id']);
                return TRUE;
        }
        return FALSE;
}

// Presume, that the target record has no tags attached.
function produceTagsForLastRecord ($realm, $tagidlist, $last_insert_id = 0)
{
        if (!count ($tagidlist))
                return '';
        if (!$last_insert_id)
                $last_insert_id = lastInsertID();
        $errcount = 0;
        foreach (getExplicitTagsOnly (buildTagChainFromIds ($tagidlist)) as $taginfo)
                if (addTagForEntity ($realm, $last_insert_id, $taginfo['id']) == FALSE)
                        $errcount++;    
        if (!$errcount)
                return '';
        else
                return "Experienced ${errcount} errors adding tags in realm '${realm}' for entity ID == ${last_insert_id}";
}

function createIPv4Prefix ($range = '', $name = '', $is_bcast = FALSE, $taglist = array())
{
        // $range is in x.x.x.x/x format, split into ip/mask vars
        $rangeArray = explode('/', $range);
        if (count ($rangeArray) != 2)
                return "Invalid IPv4 prefix '${range}'";
        $ip = $rangeArray[0];
        $mask = $rangeArray[1];

        if (empty ($ip) or empty ($mask))
                return "Invalid IPv4 prefix '${range}'";
        $ipL = ip2long($ip);
        $maskL = ip2long($mask);
        if ($ipL == -1 || $ipL === FALSE)
                return 'Bad IPv4 address';
        if ($mask < 32 && $mask > 0)
                $maskL = $mask;
        else
        {
                $maskB = decbin($maskL);
                if (strlen($maskB)!=32)
                        return 'Invalid netmask';
                $ones=0;
                $zeroes=FALSE;
                foreach( str_split ($maskB) as $digit)
                {
                        if ($digit == '0')
                                $zeroes = TRUE;
                        if ($digit == '1')
                        {
                                $ones++;
                                if ($zeroes == TRUE)
                                        return 'Invalid netmask';
                        }
                }
                $maskL = $ones;
        }
        $binmask = binMaskFromDec($maskL);
        $ipL = $ipL & $binmask;

        $query =
                "select ".
                "id, ip, mask, name ".
                "from IPRanges ";

        $result = useSelectBlade ($query, __FUNCTION__);

        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                $otherip = $row['ip'];
                $othermask = binMaskFromDec($row['mask']);
                if (($otherip & $othermask) == ($ipL & $othermask))
                        return "This subnet intersects with ".long2ip($row['ip'])."/${row['mask']}";
                if (($otherip & $binmask) == ($ipL & $binmask))
                        return "This subnet intersects with ".long2ip($row['ip'])."/${row['mask']}";
        }
        $result->closeCursor();
        unset ($result);
        $result = useInsertBlade
        (
                'IPRanges',
                array
                (
                        'ip' => sprintf ('%u', $ipL),
                        'mask' => "'${maskL}'",
                        'name' => "'${name}'"
                )
        );

        if ($is_bcast and $maskL < 31)
        {
                $network_addr = long2ip ($ipL);
                $broadcast_addr = long2ip ($ipL | binInvMaskFromDec ($maskL));
                updateAddress ($network_addr, 'network', 'yes');
                updateAddress ($broadcast_addr, 'broadcast', 'yes');
        }
        return produceTagsForLastRecord ('ipv4net', $taglist);
}

// FIXME: This function doesn't wipe relevant records from IPAddress table.
function destroyIPv4Prefix ($id = 0)
{
        if ($id <= 0)
                return __FUNCTION__ . ': Invalid IPv4 prefix ID';
        if (!useDeleteBlade ('IPRanges', 'id', $id))
                return __FUNCTION__ . ': SQL query #1 failed';
        if (!destroyTagsForEntity ('ipv4net', $id))
                return __FUNCTION__ . ': SQL query #2 failed';
        return '';
}

function loadScript ($name)
{
        $result = useSelectBlade ("select script_text from Script where script_name = '${name}'");
        $row = $result->fetch (PDO::FETCH_NUM);
        if ($row !== FALSE)
                return $row[0];
        else
                return NULL;
}

function saveScript ($name, $text)
{
        if (empty ($name))
        {
                showError ('Invalid argument');
                return FALSE;
        }
        // delete regardless of existence
        useDeleteBlade ('Script', 'script_name', "'${name}'");
        return useInsertBlade
        (
                'Script',
                array
                (
                        'script_name' => "'${name}'",
                        'script_text' => "'${text}'"
                )
        );
}

function saveUserPassword ($user_id, $newp)
{
        $newhash = hash (PASSWORD_HASH, $newp);
        $query = "update UserAccount set user_password_hash = ${newhash} where user_id = ${user_id} limit 1";
}

function objectIsPortless ($id = 0)
{
        if ($id <= 0)
        {
                showError ('Invalid argument', __FUNCTION__);
                return;
        }
        if (($result = useSelectBlade ("select count(id) from Port where object_id = ${id}", __FUNCTION__)) == NULL) 
        {
                showError ('SQL query failed', __FUNCTION__);
                return;
        }
        $row = $result->fetch (PDO::FETCH_NUM);
        $count = $row[0];
        $result->closeCursor();
        unset ($result);
        return $count === '0';
}

function tagExistsInDatabase ($tname)
{
        $result = useSelectBlade ("select count(*) from TagTree where lower(tag) = lower('${tname}')");
        $row = $result->fetch (PDO::FETCH_NUM);
        $count = $row[0];
        $result->closeCursor();
        unset ($result);
        return $count !== '0';
}

function newPortForwarding ($object_id, $localip, $localport, $remoteip, $remoteport, $proto, $description)
{
        if (NULL === getIPv4AddressNetworkId ($localip))
                return "$localip: Non existant ip";
        if (NULL === getIPv4AddressNetworkId ($localip))
                return "$remoteip: Non existant ip";
        if ( ($localport <= 0) or ($localport >= 65536) )
                return "$localport: invaild port";
        if ( ($remoteport <= 0) or ($remoteport >= 65536) )
                return "$remoteport: invaild port";

        $result = useInsertBlade
        (
                'PortForwarding',
                array
                (
                        'object_id' => $object_id,
                        'localip' => "INET_ATON('${localip}')",
                        'remoteip' => "INET_ATON('$remoteip')",
                        'localport' => $localport,
                        'remoteport' => $remoteport,
                        'proto' => "'${proto}'",
                        'description' => "'${description}'",
                )
        );
        if ($result)
                return '';
        else
                return __FUNCTION__ . ': Failed to insert the rule.';
}

function deletePortForwarding ($object_id, $localip, $localport, $remoteip, $remoteport, $proto)
{
        global $dbxlink;

        $query =
                "delete from PortForwarding where object_id='$object_id' and localip=INET_ATON('$localip') and remoteip=INET_ATON('$remoteip') and localport='$localport' and remoteport='$remoteport' and proto='$proto'";
        $result = $dbxlink->exec ($query);
        return '';
}

function updatePortForwarding ($object_id, $localip, $localport, $remoteip, $remoteport, $proto, $description)
{
        global $dbxlink;

        $query =
                "update PortForwarding set description='$description' where object_id='$object_id' and localip=INET_ATON('$localip') and remoteip=INET_ATON('$remoteip') and localport='$localport' and remoteport='$remoteport' and proto='$proto'";
        $result = $dbxlink->exec ($query);
        return '';
}

function getNATv4ForObject ($object_id)
{
        $ret = array();
        $ret['out'] = array();
        $ret['in'] = array();
        $query =
                "select ".
                "proto, ".
                "INET_NTOA(localip) as localip, ".
                "localport, ".
                "INET_NTOA(remoteip) as remoteip, ".
                "remoteport, ".
                "ipa1.name as local_addr_name, " .
                "ipa2.name as remote_addr_name, " .
                "description ".
                "from PortForwarding ".
                "left join IPAddress as ipa1 on PortForwarding.localip = ipa1.ip " .
                "left join IPAddress as ipa2 on PortForwarding.remoteip = ipa2.ip " .
                "where object_id='$object_id' ".
                "order by localip, localport, proto, remoteip, remoteport";
        $result = useSelectBlade ($query, __FUNCTION__);
        $count=0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                foreach (array ('proto', 'localport', 'localip', 'remoteport', 'remoteip', 'description', 'local_addr_name', 'remote_addr_name') as $cname)
                        $ret['out'][$count][$cname] = $row[$cname];
                $count++;
        }
        $result->closeCursor();
        unset ($result);

        $query =
                "select ".
                "proto, ".
                "INET_NTOA(localip) as localip, ".
                "localport, ".
                "INET_NTOA(remoteip) as remoteip, ".
                "remoteport, ".
                "PortForwarding.object_id as object_id, ".
                "RackObject.name as object_name, ".
                "description ".
                "from ((PortForwarding join IPBonds on remoteip=IPBonds.ip) join RackObject on PortForwarding.object_id=RackObject.id) ".
                "where IPBonds.object_id='$object_id' ".
                "order by remoteip, remoteport, proto, localip, localport";
        $result = useSelectBlade ($query, __FUNCTION__);
        $count=0;
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                foreach (array ('proto', 'localport', 'localip', 'remoteport', 'remoteip', 'object_id', 'object_name', 'description') as $cname)
                        $ret['in'][$count][$cname] = $row[$cname];
                $count++;
        }
        $result->closeCursor();

        return $ret;
}

// This function performs search and then calculates score for each result.
// Given previous search results in $objects argument, it adds new results
// to the array and updates score for existing results, if it is greater than
// existing score.
function mergeSearchResults (&$objects, $terms, $fieldname)
{
        global $dbxlink;
        $query =
                "select name, label, asset_no, barcode, ro.id, dict_key as objtype_id, " .
                "dict_value as objtype_name, asset_no from RackObject as ro inner join Dictionary " .
                "on objtype_id = dict_key natural join Chapter where chapter_name = 'RackObjectType' and ";
        $count = 0;
        foreach (explode (' ', $terms) as $term)
        {
                if ($count) $query .= ' or ';
                $query .= "${fieldname} like '%$term%'";
                $count++;
        }
        $query .= " order by ${fieldname}";
        $result = useSelectBlade ($query, __FUNCTION__);
// FIXME: this dead call was executed 4 times per 1 object search!
//      $typeList = getObjectTypeList();
        $clist = array ('id', 'name', 'label', 'asset_no', 'barcode', 'objtype_id', 'objtype_name');
        while ($row = $result->fetch (PDO::FETCH_ASSOC))
        {
                foreach ($clist as $cname)
                        $object[$cname] = $row[$cname];
                $object['score'] = 0;
                $object['dname'] = displayedName ($object);
                unset ($object['objtype_id']);
                foreach (explode (' ', $terms) as $term)
                        if (strstr ($object['name'], $term))
                                $object['score'] += 1;
                unset ($object['name']);
                if (!isset ($objects[$row['id']]))
                        $objects[$row['id']] = $object;
                elseif ($objects[$row['id']]['score'] < $object['score'])
                        $objects[$row['id']]['score'] = $object['score'];
        }
        return $objects;
}

?>