119 lines
3.7 KiB
Perl
119 lines
3.7 KiB
Perl
#!/usr/bin/perl -w
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# vnstat-metrics.cgi -- Prometheus compatible metrics endpoint output from vnStat data
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# copyright (c) 2022 Teemu Toivola <tst at iki dot fi>
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# released under the GNU General Public License
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use strict;
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use JSON::PP;
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# location of vnstat binary
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my $vnstat_cmd = '/usr/bin/vnstat';
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################
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sub get_interface_alias
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{
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my ($interface) = @_;
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my $interface_alias = $interface->{'alias'};
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if (length($interface_alias) == 0) {
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$interface_alias = $interface->{'name'};
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}
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return $interface_alias;
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}
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sub print_totals
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{
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my ($data) = @_;
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print "\n# HELP vnstat_interface_total_received_bytes All time total received (rx) bytes\n";
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print "# TYPE vnstat_interface_total_received_bytes counter\n";
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foreach my $interface ( @{ $data->{'interfaces'} } ) {
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my $interface_alias = get_interface_alias($interface);
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print "vnstat_interface_total_received_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{'total'}{'rx'} $interface->{'updated'}{'timestamp'}000\n";
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}
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print "\n# HELP vnstat_interface_total_transmitted_bytes All time total transmitted (tx) bytes\n";
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print "# TYPE vnstat_interface_total_transmitted_bytes counter\n";
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foreach my $interface ( @{ $data->{'interfaces'} } ) {
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my $interface_alias = get_interface_alias($interface);
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print "vnstat_interface_total_transmitted_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{'total'}{'tx'} $interface->{'updated'}{'timestamp'}000\n";
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}
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}
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sub print_data_resolution
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{
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my ($resolution, $data) = @_;
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my $output_count = 0;
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print "\n# HELP vnstat_interface_".$resolution."_received_bytes Received (rx) bytes for current $resolution\n";
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print "# TYPE vnstat_interface_".$resolution."_received_bytes gauge\n";
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$output_count = 0;
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foreach my $interface ( @{ $data->{'interfaces'} } ) {
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my $interface_alias = get_interface_alias($interface);
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if (defined $interface->{'traffic'}{$resolution}) {
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print "vnstat_interface_".$resolution."_received_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{$resolution}[0]{'rx'} $interface->{'updated'}{'timestamp'}000\n";
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$output_count++;
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}
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}
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if ($output_count == 0) {
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print "# no data\n";
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}
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print "\n# HELP vnstat_interface_".$resolution."_transmitted_bytes Transmitted (tx) bytes for current $resolution\n";
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print "# TYPE vnstat_interface_".$resolution."_transmitted_bytes gauge\n";
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$output_count = 0;
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foreach my $interface ( @{ $data->{'interfaces'} } ) {
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my $interface_alias = get_interface_alias($interface);
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if (defined $interface->{'traffic'}{$resolution}) {
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print "vnstat_interface_".$resolution."_transmitted_bytes{interface=\"$interface->{'name'}\",alias=\"$interface_alias\"} $interface->{'traffic'}{$resolution}[0]{'tx'} $interface->{'updated'}{'timestamp'}000\n";
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$output_count++;
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}
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}
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if ($output_count == 0) {
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print "# no data\n";
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}
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}
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my @data_resolutions = ('fiveminute', 'hour', 'day', 'month', 'year');
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print "Content-Type: text/plain\n\n";
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my $json_data = `$vnstat_cmd --json s 1`;
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my $data = "";
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eval { $data = decode_json($json_data) };
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if ($@) {
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print "# Error: Invalid command output: $json_data\n";
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exit 1;
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}
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if (not defined $data->{'vnstatversion'}) {
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print "# Error: Expected content from command output missing\n";
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exit 1;
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}
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if (not defined $data->{'interfaces'}[0]) {
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print "# Error: No interfaces found in command output\n";
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exit 1;
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}
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if (not defined $data->{'interfaces'}[0]{'created'}{'timestamp'}) {
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print "# Error: Incompatible vnStat version used\n";
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exit 1;
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}
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print "# vnStat version: ".$data->{'vnstatversion'}."\n";
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print_totals($data);
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foreach my $data_resolution ( @data_resolutions ) {
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print_data_resolution($data_resolution, $data);
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}
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