version 1.1128, 2011/08/09 01:06:33
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version 1.1129, 2011/08/09 01:35:24
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Line 1185 sub spares_for_offload {
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Line 1185 sub spares_for_offload {
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return; |
return; |
} |
} |
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sub get_lonbalancer_config { |
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my ($servers) = @_; |
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my ($currbalancer,$currtargets); |
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if (ref($servers) eq 'HASH') { |
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foreach my $server (keys(%{$servers})) { |
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my %what = ( |
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spareid => 1, |
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perlvar => 1, |
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); |
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my ($result,$returnhash) = &get_remote_globals($server,\%what); |
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if ($result eq 'ok') { |
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if (ref($returnhash) eq 'HASH') { |
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if (ref($returnhash->{'perlvar'}) eq 'HASH') { |
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if ($returnhash->{'perlvar'}->{'lonBalancer'} eq 'yes') { |
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$currbalancer = $server; |
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$currtargets = {}; |
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if (ref($returnhash->{'spareid'}) eq 'HASH') { |
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if (ref($returnhash->{'spareid'}->{'primary'}) eq 'ARRAY') { |
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$currtargets->{'primary'} = $returnhash->{'spareid'}->{'primary'}; |
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} |
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if (ref($returnhash->{'spareid'}->{'default'}) eq 'ARRAY') { |
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$currtargets->{'default'} = $returnhash->{'spareid'}->{'default'}; |
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} |
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} |
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last; |
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} |
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} |
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} |
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} |
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} |
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} |
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return ($currbalancer,$currtargets); |
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} |
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sub check_loadbalancing { |
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my ($uname,$udom) = @_; |
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my ($is_balancer,$dom_in_use,$homeintdom,$rule_in_effect, |
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$offloadto,$otherserver); |
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my $lonhost = $perlvar{'lonHostID'}; |
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my $uprimary_id = &Apache::lonnet::domain($udom,'primary'); |
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my $uintdom = &Apache::lonnet::internet_dom($uprimary_id); |
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my $intdom = &Apache::lonnet::internet_dom($lonhost); |
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my $serverhomedom = &host_domain($lonhost); |
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my $cachetime = 60*60*24; |
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if (($uintdom ne '') && ($uintdom eq $intdom)) { |
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$dom_in_use = $udom; |
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$homeintdom = 1; |
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} else { |
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$dom_in_use = $serverhomedom; |
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} |
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my ($result,$cached)=&is_cached_new('loadbalancing',$dom_in_use); |
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unless (defined($cached)) { |
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my %domconfig = |
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&Apache::lonnet::get_dom('configuration',['loadbalancing'],$dom_in_use); |
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if (ref($domconfig{'loadbalancing'}) eq 'HASH') { |
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$result = &do_cache_new('loadbalancing',$dom_in_use,$domconfig{'usersessions'}{'loadbalancing'},$cachetime); |
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} |
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} |
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if (ref($result) eq 'HASH') { |
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my $currbalancer = $result->{'lonhost'}; |
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my $currtargets = $result->{'targets'}; |
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my $currrules = $result->{'rules'}; |
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if ($currbalancer ne '') { |
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my @hosts = ¤t_machine_ids(); |
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if (grep(/^\Q$currbalancer\E$/,@hosts)) { |
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$is_balancer = 1; |
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} |
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} |
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if ($is_balancer) { |
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if (ref($currrules) eq 'HASH') { |
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if ($homeintdom) { |
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if ($uname ne '') { |
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if (($currrules->{'_LC_adv'} ne '') || ($currrules->{'_LC_author'} ne '')) { |
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my ($is_adv,$is_author) = &is_advanced_user($udom,$uname); |
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if (($currrules->{'_LC_author'} ne '') && ($is_author)) { |
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$rule_in_effect = $currrules->{'_LC_author'}; |
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} elsif (($currrules->{'_LC_adv'} ne '') && ($is_adv)) { |
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$rule_in_effect = $currrules->{'_LC_adv'} |
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} |
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} |
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if ($rule_in_effect eq '') { |
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my %userenv = &userenvironment($udom,$uname,'inststatus'); |
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if ($userenv{'inststatus'} ne '') { |
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my @statuses = map { &unescape($_); } split(/:/,$userenv{'inststatus'}); |
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my ($othertitle,$usertypes,$types) = |
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&Apache::loncommon::sorted_inst_types($udom); |
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if (ref($types) eq 'ARRAY') { |
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foreach my $type (@{$types}) { |
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if (grep(/^\Q$type\E$/,@statuses)) { |
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if (exists($currrules->{$type})) { |
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$rule_in_effect = $currrules->{$type}; |
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} |
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} |
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} |
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} |
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} else { |
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if (exists($currrules->{'default'})) { |
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$rule_in_effect = $currrules->{'default'}; |
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} |
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} |
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} |
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} else { |
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if (exists($currrules->{'default'})) { |
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$rule_in_effect = $currrules->{'default'}; |
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} |
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} |
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} else { |
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if ($currrules->{'_LC_external'} ne '') { |
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$rule_in_effect = $currrules->{'_LC_external'}; |
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} |
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} |
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$offloadto = &get_loadbalancer_targets($rule_in_effect,$currtargets, |
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$uname,$udom); |
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} |
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} |
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} elsif (($homeintdom) && ($udom ne $serverhomedom)) { |
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my ($result,$cached)=&is_cached_new('loadbalancing',$serverhomedom); |
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unless (defined($cached)) { |
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my %domconfig = |
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&Apache::lonnet::get_dom('configuration',['loadbalancing'],$serverhomedom); |
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if (ref($domconfig{'loadbalancing'}) eq 'HASH') { |
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$result = &do_cache_new('loadbalancing',$dom_in_use,$domconfig{'usersessions'}{'loadbalancing'},$cachetime); |
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} |
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} |
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if (ref($result) eq 'HASH') { |
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my $currbalancer = $result->{'lonhost'}; |
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my $currtargets = $result->{'targets'}; |
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my $currrules = $result->{'rules'}; |
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if ($currbalancer eq $lonhost) { |
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$is_balancer = 1; |
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if (ref($currrules) eq 'HASH') { |
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if ($currrules->{'_LC_internetdom'} ne '') { |
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$rule_in_effect = $currrules->{'_LC_internetdom'}; |
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} |
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} |
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$offloadto = &get_loadbalancer_targets($rule_in_effect,$currtargets, |
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$uname,$udom); |
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} |
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} else { |
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if ($perlvar{'lonBalancer'} eq 'yes') { |
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$is_balancer = 1; |
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$offloadto = &this_host_spares($dom_in_use); |
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} |
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} |
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} else { |
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if ($perlvar{'lonBalancer'} eq 'yes') { |
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$is_balancer = 1; |
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$offloadto = &this_host_spares($dom_in_use); |
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} |
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} |
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my $lowest_load = 30000; |
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if (ref($offloadto) eq 'HASH') { |
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if (ref($offloadto->{'primary'}) eq 'ARRAY') { |
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foreach my $try_server (@{$offloadto->{'primary'}}) { |
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($otherserver,$lowest_load) = |
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&compare_server_load($try_server,$otherserver,$lowest_load); |
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} |
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} |
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my $found_server = ($otherserver ne '' && $lowest_load < 100); |
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if (!$found_server) { |
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if (ref($offloadto->{'default'}) eq 'ARRAY') { |
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foreach my $try_server (@{$offloadto->{'default'}}) { |
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($otherserver,$lowest_load) = |
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&compare_server_load($try_server,$otherserver,$lowest_load); |
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} |
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} |
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} |
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} elsif (ref($offloadto) eq 'ARRAY') { |
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if (@{$offloadto} == 1) { |
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$otherserver = $offloadto->[0]; |
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} elsif (@{$offloadto} > 1) { |
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foreach my $try_server (@{$offloadto}) { |
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($otherserver,$lowest_load) = |
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&compare_server_load($try_server,$otherserver,$lowest_load); |
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} |
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} |
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} |
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return ($is_balancer,$otherserver); |
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} |
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sub get_loadbalancer_targets { |
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my ($rule_in_effect,$currtargets,$uname,$udom) = @_; |
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my $offloadto; |
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if ($rule_in_effect eq '') { |
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$offloadto = $currtargets; |
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} else { |
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if ($rule_in_effect eq 'homeserver') { |
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my $homeserver = &homeserver($uname,$udom); |
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if ($homeserver ne 'no_host') { |
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$offloadto = [$homeserver]; |
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} |
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} elsif ($rule_in_effect eq 'externalbalancer') { |
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my %domconfig = |
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&Apache::lonnet::get_dom('configuration',['loadbalancing'],$udom); |
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if (ref($domconfig{'loadbalancing'}) eq 'HASH') { |
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if ($domconfig{'loadbalancing'}{'lonhost'} ne '') { |
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if (&hostname($domconfig{'loadbalancing'}{'lonhost'}) ne '') { |
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$offloadto = [$domconfig{'loadbalancing'}{'lonhost'}]; |
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} |
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} |
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} else { |
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my %servers = &dom_servers($udom); |
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my ($remotebalancer,$remotetargets) = &get_lonbalancer_config(\%servers); |
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if (&hostname($remotebalancer) ne '') { |
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$offloadto = [$remotebalancer]; |
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} |
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} |
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} elsif (&hostname($rule_in_effect) ne '') { |
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$offloadto = [$rule_in_effect]; |
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} |
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} |
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return $offloadto; |
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} |
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sub internet_dom_servers { |
sub internet_dom_servers { |
my ($dom) = @_; |
my ($dom) = @_; |
my (%uniqservers,%servers); |
my (%uniqservers,%servers); |