335 lines
9.5 KiB
Perl
335 lines
9.5 KiB
Perl
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#!/usr/bin/env perl
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# IBM(c) 2007 EPL license http://www.eclipse.org/legal/epl-v10.html
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package xCAT::NotifHandler;
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use File::Basename qw(fileparse);
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#%notif is a cache that holds the info from the "notification" table.
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#the format of it is:
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# {tablename=>{'a'=>[filename,...]
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# 'u'=>[filename,,..]
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# 'd'=>[filename,...]
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# }
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# }
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%notif;
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$masterpid=$$;
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1;
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#-------------------------------------------------------------------------------
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=head1 xCATi::NotifHandler
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=head2 Package Description
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This mondule caches the notification table and tracks the changes of it.
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It also handles the event notification when xCAT database changes.
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=cut
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#-------------------------------------------------------------------------------
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#--------------------------------------------------------------------------------
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=head3 setup
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It is called by xcatd to get set the pid of the parent of all this object.
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Setup the signal to trap any changes in the notification table. It also
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initializes the cache with the current data in the notification table.
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table and store it into %notif variable.
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Arguments:
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pid -- the process id of the caller.
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Returns:
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none
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=cut
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#-------------------------------------------------------------------------------
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sub setup
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{
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$masterpid=shift;
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if ($masterpid =~ /xCAT::NotifHandler/) {
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$masterpid=shift;
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}
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refreshNotification();
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$SIG{USR1}=\&handleNotifSigal;
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}
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#--------------------------------------------------------------------------------
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=head3 handleNotifSigal
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It is called when the signal is received. It then update the cache with the
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latest data in the notification table.
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Arguments:
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none.
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Returns:
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none
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=cut
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#-------------------------------------------------------------------------------
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sub handleNotifSigal {
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refreshNotification();
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$SIG{USR1}=\&handleNotifSigal;
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}
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#--------------------------------------------------------------------------------
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=head3 sendNotifSignal
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It is called by any module that has made changes to the notification table.
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Arguments:
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none.
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Returns:
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none
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=cut
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#-------------------------------------------------------------------------------
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sub sendNotifSignal {
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kill('USR1', $masterpid);
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}
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#--------------------------------------------------------------------------------
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=head3 refreshNotification
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It loads the notification info from the "notification"
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table and store it into %notif variable.
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The format of it is:
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{tablename=>{filename=>{'ops'=>['y/n','y/n','y/n'], 'disable'=>'y/n'}}}
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Arguments:
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none
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Returns:
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none
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=cut
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#-------------------------------------------------------------------------------
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sub refreshNotification
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{
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#flush the cache
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%notif=();
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my $table=xCAT::Table->new("notification", -create =>0);
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if ($table) {
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#get array of rows out of the notification table
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my @row_array= $table->getTable;
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if (@row_array) {
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#store the information to the cache
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foreach(@row_array) {
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my $module=$_->{filename};
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my $ops=$_->{tableops};
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my $disable= $_->{disable};
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my @tablenames=split(/,/, $_->{tables});
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foreach(@tablenames) {
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if (!exists($notif{$_})) {
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$notif{$_}={};
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}
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my $tempdisable=0;
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if ($disable) {
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if ($disable =~ m/^(yes|YES|Yes|Y|y|1)$/) {
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$tempdisable=1;
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}
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}
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if (!$disable) {
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if ($ops) {
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if ($ops =~ m/a/) {
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if (exists($notif{$_}->{a})) {
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my $pa=$notif{$_}->{a};
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push(@$pa, $module);
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} else {
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$notif{$_}->{a}=[$module];
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}
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}
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if ($ops =~ m/d/) {
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if (exists($notif{$_}->{d})) {
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my $pa=$notif{$_}->{d};
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push(@$pa, $module);
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} else {
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$notif{$_}->{d}=[$module];
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}
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}
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if ($ops =~ m/u/) {
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if (exists($notif{$_}->{u})) {
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my $pa=$notif{$_}->{u};
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push(@$pa, $module);
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} else {
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$notif{$_}->{u}=[$module];
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}
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}
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} #end if
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}
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} #end foreach
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} #end foreach(@row_array)
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}end if (@row_array)
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} #end if ($table)
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return 1;
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}
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#--------------------------------------------------------------------------------
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=head3 dumpNotificationCache
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It print out the content of the notification cache for debugging purpose.
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Arguments:
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none
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Returns:
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0
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=cut
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#-------------------------------------------------------------------------------
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sub dumpNotificationCache {
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print "dump the notification cache:\n";
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foreach(keys(%notif)) {
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my $tmptn=$_;
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print " $tmptn: \n";
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if (exists($notif{$_}->{a})) {
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print " a--:";
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my $files=$notif{$_}->{a};
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print "@$files\n";
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}
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if (exists($notif{$_}->{u})) {
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print " u--:";
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my $files=$notif{$_}->{u};
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print "@$files\n";
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}
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if (exists($notif{$_}->{d})) {
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print " d--:";
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my $files=$notif{$_}->{d};
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print "@$files\n";
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}
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}
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return 0;
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}
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#--------------------------------------------------------------------------------
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=head3 needToNotify
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It check if the given table has interested parties watching for its changes.
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Arguments:
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tablename - the name of the table to be checked.
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tableop - the operation on the table. 'a' for add, 'u' for update
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and 'd' for delete.
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Returns:
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1 - if the table has interested parties.
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0 - if no parties are interested in its changes.
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=cut
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#-------------------------------------------------------------------------------
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sub needToNotify {
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if (!defined %notif) {
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# print "notif not defined\n";
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refreshNotification();
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}
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my $tablename=shift;
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if ($tablename =~ /xCAT::NotifHandler/) {
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$tablename=shift;
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}
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my $tableop=shift;
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if (%notif) {
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if (exists($notif{$tablename})) {
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if (exists($notif{$tablename}->{$tableop})) {
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return 1;
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}
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}
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}
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return 0;
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}
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#--------------------------------------------------------------------------------
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=head3 notify
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It notifies the registered the modules with the latest changes in
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a DB table.
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Arguments:
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action - table action. It can be d for rows deleted, a for rows added
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or u for rows updated.
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tablename - string. The name of the DB table whose data has been changed.
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old_data - an array reference of the old row data that has been changed.
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The first element is an array reference that contains the column names.
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The rest of the elelments are also array references each contains
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attribute values of a row.
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It is set when the action is u or d.
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new_data - a hash refernce of new row data; only changed values are present
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in the hash. It is keyed by column names.
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It is set when the action is u or a.
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Returns:
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0
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Comments:
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If the curent table is watched by a perl module, the module must implement
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the following routine:
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processTableChanges(action, table_name, old_data, new_data)
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If it is a watched by a command, the data will be passed to the command
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through STDIN. The format is:
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action
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table_name
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[old data]
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col1_name,col2_name,...
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col1_value,col2_value,...
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...
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[new data]
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col1_name,col2_name,...
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col1_value,col2_value,...
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...
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=cut
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#-------------------------------------------------------------------------------
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sub notify {
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my $action=shift;
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if ($action =~ /xCAT::NotifHandler/) {
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$action=shift;
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}
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my $tablename=shift;
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my $old_data=shift;
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my $new_data=shift;
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# print "notify called: tablename=$tablename, action=$action\n";
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my @filenames=();
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if (%notif) {
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if (exists($notif{$tablename})) {
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if (exists($notif{$tablename}->{$action})) {
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my $pa=$notif{$tablename}->{$action};
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@filenames=@$pa;
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}
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}
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}
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foreach(@filenames) {
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my ($modname, $path, $suffix) = fileparse($_, ".pm");
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# print "modname=$modname, path=$path, suffix=$suffix\n";
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if ($suffix =~ /.pm/) { #it is a perl module
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my $pid;
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if ($pid=fork()) { }
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elsif (defined($pid)) {
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if (($path eq "") || ($path eq ".\/")) {
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#default path is /usr/lib/xcat/monitoring/ if there is no path specified
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require "/usr/lib/xcat/monitoring/".$modname.".pm";
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} else {
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require $_;
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}
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${"xCAT_monitoring::".$modname."::"}{processTableChanges}->($action, $tablename, $old_data, $new_data);
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exit 0;
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}
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}
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else { #it is a command
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my $pid;
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if ($pid=fork()) { }
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elsif (defined($pid)) {
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# print "command=$_\n";
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if (open(CMD, "|$_")) {
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print(CMD "$action\n");
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print(CMD "$tablename\n");
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print(CMD "[old data]\n");
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foreach (@$old_data) {
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print(CMD join(',', @$_)."\n");
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}
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print(CMD "[new data]\n");
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if (%$new_data) {
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print(CMD join(',', keys %$new_data) . "\n");
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print(CMD join(',', values %$new_data) . "\n");
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}
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close(CMD) or print "Cannot close the command $_\n";
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}
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else {
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print "Command $_ cannot be found\n";
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}
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exit 0;
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} #elsif
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}
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} #foreach
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return 0;
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}
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