mirror of
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193 lines
6.5 KiB
Perl
193 lines
6.5 KiB
Perl
#!/usr/bin/perl
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=head1 README
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This is a logfile watcher for apache, it monitors a log dir for access logs and saves some stats to shared memory.
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Munin can then fetch and reset the stats periodically.
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Just start it once, it runs as a daemon and polls logs every n sec keeping track of changes to the logs.
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Filelist is read on startup and on defined scan_intervals. File position is recorded and logs are checked for truncate/delete (for performance reasons).
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Requires perl modules File::Tail::Multi Storable IPC::ShareLite Munin::Plugin (optional Data::Dumper)
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You can use it in parallel to the pipelogger if that suits you better, the stats are merged in shared mem.
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Both ways should show decent performance, the pipelogger works in RAM only, but writes no logs.
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=head1 INSTALLATION
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Install to /usr/share/munin and run it as root
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configure the variables below:
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$dir path to your logfiles
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$files file-glob to find access logs
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$site regexp to find sitename from logfile name
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$statefile file to save last log position for tail
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$nsec tail and write to shared mem every n seconds
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$debug dump tallied data every n seconds, print every log line parsed
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$scan_interval rescan for new log files every n minutes
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$type log file type:
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common: CLF + vhost + time + (other fields)
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combined: combined + time + (other fields)
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=cut
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# config
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my $dir = "/logs/apache_logs";
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my $files = "*access_log";
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my $site = "(.*)-access_log";
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my $statefile = "/tmp/logstate";
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`touch $statefile` unless (-f $statefile);
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local $type="combined";
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local $nsec=7;
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local $debug=0;
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my $scan_interval=5; # minutes
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# perl modules
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# "File:Tail:Multi" disappeared from CPAN (somewhen in 2016) - thus it needs
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# to be imported carefully (for travis checks).
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eval 'use File::Tail::Multi; 1;' or die 'Please install File::Tail::Multi';
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use Storable qw(freeze thaw);
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use List::Util qw(min max);
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use IPC::ShareLite ':lock';
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require Data::Dumper if $debug;
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use Munin::Plugin;
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# shared mem
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local $share = IPC::ShareLite->new(
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-key => 'mapl',
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-create => 1,
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-destroy => 1,
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-exclusive => 0,
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-mode => '0666'
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) or die $!;
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# drop stored data on reload
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$share->store( freeze {} );
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# tail log files
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my $tail=File::Tail::Multi->new (
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Files=>["$dir/$files"],
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ScanForFiles=>$scan_interval,
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Debug=>0,
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LastRun_File => $statefile,
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RemoveDuplicate=>0,
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NumLines=>0,
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OutputPrefix=>"f"
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);
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# read to current position
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$tail->read;
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# register counting function
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$tail->Function(\&count);
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local $temp;
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my ($file,$ip,$logname,$user,$rtime,$method,$request,$protocol,$status,$bytes,$referer,$useragent,$time);
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sub count {
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foreach $_ (@{shift()}) {
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if ((()=/"/g)==2) {
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# common with filename prefix, optionally add time and vhost at the end
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($file,$ip,$logname,$user,$rtime,$method,$request,$protocol,$status,$bytes,$time,$vhost)=/^(.*?)\s:\s(.*?)\s(.*?)\s(.*?)\s\[(.*?)\]\s"(.*)\s(.*?)\s(.*?)"\s(\d*)\s(\S*)\s?(\S*)\s?(\S*?)$/o;
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}
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elsif ((()=/"/g)==6) {
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# combined with filename prefix, optionally add time and vhost at the end
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($file,$ip,$logname,$user,$rtime,$method,$request,$protocol,$status,$bytes,$referer,$useragent,$time,$vhost)=/^(.*?)\s:\s(.*?)\s(.*?)\s(.*?)\s\[(.*?)\]\s"(.*)\s(.*?)\s(.*?)"\s(\d*?)\s(.*?)\s"(.*?)"\s"(.*?)"\s?(\S*)\s?(\S*)$/o;
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};
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#find sitename
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$file=~s/$site/$1/;
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$file=$vhost if $vhost;
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# skip broken lines
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next unless $file;
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# sitename to munin fieldname
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my $vpm=clean_fieldname("$file");
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$temp{$vpm}{'label'}="$file";
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$temp{$vpm}{'label'}=~s/www\.//;
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# count all requests
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$temp{$vpm}{'requests'}++;
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if ($bytes) {
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$bytes=~s/-/0/;
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# bytes transmitted
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$temp{$vpm}{'bytes'}+=$bytes;
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# max bytes
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$temp{$vpm}{'max_bytes'}=max($temp{$vpm}{'max_bytes'},$bytes) || 0;
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# average bytes
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$temp{$vpm}{'avg_bytes'}=$temp{$vpm}{'bytes'}/$temp{$vpm}{'requests'} || 0;
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}
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# count by status / error code
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$temp{$vpm}{"status"}{$status}++ if $status;
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if ($time) {
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# microsec to millisec
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$time=sprintf("%d",$time/1000);
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# min/max execution time
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$temp{$vpm}{'max_time'}=max($temp{$vpm}{'max_time'},$time) || 0;
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# cumulative execution time
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$temp{$vpm}{'time'}+=$time;
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# average time
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$temp{$vpm}{'avg_time'}=$temp{$vpm}{'time'}/$temp{$vpm}{'requests'} || 0;
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}
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};
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};
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while (1) {
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# tail files, calls &count with linearray
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$tail->read;
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# begin transaction
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$share->lock(LOCK_EX);
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# get data (may be updated by other loggers too)
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my %old=eval{%{thaw($share->fetch)}}; # using eval to suppress thaw error on empty string at the first run
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foreach my $vpm (keys %temp){
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# merge values
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$old{$vpm}{'label'}=$temp{$vpm}{'label'};
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$old{$vpm}{'bytes'}+=$temp{$vpm}{'bytes'} if $temp{$vpm}{'bytes'};
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$old{$vpm}{'requests'}+=$temp{$vpm}{'requests'} if $temp{$vpm}{'requests'};
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$old{$vpm}{'time'}+=$temp{$vpm}{'time'} if $temp{$vpm}{'time'};
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# avoid div by zero
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my $div=($old{$vpm}{'requests'} <1)?1:$old{$vpm}{'requests'};
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# recalc average on merged data for multiple datasources, use local average after purge/restart
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$old{$vpm}{'avg_time'}=($old{$vpm}{'avg_time'}>0)?sprintf("%d",($old{$vpm}{'time'}+$temp{$vpm}{'time'})/$div):sprintf("%d",$temp{$vpm}{'avg_time'});
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$old{$vpm}{'avg_bytes'}=($old{$vpm}{'avg_bytes'}>0)?sprintf("%d",($old{$vpm}{'bytes'}+$temp{$vpm}{'bytes'})/$div):sprintf("%d",$temp{$vpm}{'avg_bytes'});
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$old{$vpm}{'max_time'}=max($old{$vpm}{'max_time'},$temp{$vpm}{'max_time'}) || 0;
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$old{$vpm}{'max_bytes'}=max($old{$vpm}{'max_bytes'},$temp{$vpm}{'max_bytes'}) || 0;
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# reset local counters
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foreach my $check qw(requests bytes time max_bytes avg_bytes max_time avg_time) {
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$temp{$vpm}{$check}=0;
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}
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# reset status counts
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foreach my $val (keys %{$temp{$vpm}{'status'}}) {
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$old{$vpm}{'status'}{$val}+=$temp{$vpm}{'status'}{$val};
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$temp{$vpm}{'status'}{$val}=0;
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}
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};
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# save to shm
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print Data::Dumper::Dumper(%old) if $debug;
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$share->store( freeze \%old );
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# end transaction
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$share->unlock;
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# parse/write every n seconds (plus processing time)
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sleep $nsec;
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}
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