From b62a1a98bc65f52d972a3f403c5b29d6a84642fd Mon Sep 17 00:00:00 2001 From: John 'Warthog9' Hawley Date: Sat, 30 Jan 2010 23:30:39 +0100 Subject: gitweb: Load checking This changes slightly the behavior of gitweb, so that it verifies that the box isn't inundated with before attempting to serve gitweb. If the box is overloaded, it basically returns a 503 Server Unavailable until the load falls below the defined threshold. This helps dramatically if you have a box that's I/O bound, reaches a certain load and you don't want gitweb, the I/O hog that it is, increasing the pain the server is already undergoing. This behavior is controlled by $maxload configuration variable. Default is a load of 300, which for most cases should never be hit. Unset it (set it to undefined value, i.e. undef) to turn off checking. Currently it requires that '/proc/loadavg' file exists, otherwise the load check is bypassed (load is taken to be 0). So platforms that do not implement '/proc/loadavg' currently cannot use this feature (provisions are included for additional checks to be added by others). There is simple test in t/t9501-gitweb-standalone-http-status.sh to check that it correctly returns "503 Service Unavailable" if load is too high, and also if there are any Perl warnings or errors. Signed-off-by: John 'Warthog9' Hawley Signed-off-by: Jakub Narebski Signed-off-by: Junio C Hamano diff --git a/gitweb/README b/gitweb/README index e34ee79..6c2c8e1 100644 --- a/gitweb/README +++ b/gitweb/README @@ -174,7 +174,7 @@ not include variables usually directly set during build): Base URL for relative URLs in pages generated by gitweb, (e.g. $logo, $favicon, @stylesheets if they are relative URLs), needed and used only for URLs with nonempty PATH_INFO via - . Usually gitweb sets its value correctly, and there is no need to set this variable, e.g. to $my_uri or "/". * $home_link Target of the home link on top of all pages (the first part of view @@ -228,6 +228,11 @@ not include variables usually directly set during build): repositories from launching cross-site scripting (XSS) attacks. Set this to true if you don't trust the content of your repositories. The default is false. + * $maxload + Used to set the maximum load that we will still respond to gitweb queries. + If server load exceed this value then return "503 Service Unavaliable" error. + Server load is taken to be 0 if gitweb cannot determine its value. Set it to + undefined value to turn it off. The default is 300. Projects list file format diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl index 7e477af..e2522cc 100755 --- a/gitweb/gitweb.perl +++ b/gitweb/gitweb.perl @@ -221,6 +221,12 @@ our %avatar_size = ( 'double' => 32 ); +# Used to set the maximum load that we will still respond to gitweb queries. +# If server load exceed this value then return "503 server busy" error. +# If gitweb cannot determined server load, it is taken to be 0. +# Leave it undefined (or set to 'undef') to turn off load checking. +our $maxload = 300; + # You define site-wide feature defaults here; override them with # $GITWEB_CONFIG as necessary. our %feature = ( @@ -551,12 +557,38 @@ if (-e $GITWEB_CONFIG) { do $GITWEB_CONFIG_SYSTEM if -e $GITWEB_CONFIG_SYSTEM; } +# Get loadavg of system, to compare against $maxload. +# Currently it requires '/proc/loadavg' present to get loadavg; +# if it is not present it returns 0, which means no load checking. +sub get_loadavg { + if( -e '/proc/loadavg' ){ + open my $fd, '<', '/proc/loadavg' + or return 0; + my @load = split(/\s+/, scalar <$fd>); + close $fd; + + # The first three columns measure CPU and IO utilization of the last one, + # five, and 10 minute periods. The fourth column shows the number of + # currently running processes and the total number of processes in the m/n + # format. The last column displays the last process ID used. + return $load[0] || 0; + } + # additional checks for load average should go here for things that don't export + # /proc/loadavg + + return 0; +} + # version of the core git binary our $git_version = qx("$GIT" --version) =~ m/git version (.*)$/ ? $1 : "unknown"; $number_of_git_cmds++; $projects_list ||= $projectroot; +if (defined $maxload && get_loadavg() > $maxload) { + die_error(503, "The load average on the server is too high"); +} + # ====================================================================== # input validation and dispatch @@ -3328,7 +3360,8 @@ sub git_footer_html { } print qq!\n!; - if ($action eq 'blame_incremental') { + if (defined $action && + $action eq 'blame_incremental') { print qq!