loadshedding scripts
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#!/usr/bin/perl
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# Requires HTML::TableExtract and MIME::Lite
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# On Ubuntu/Debian: sudo aptitude install libhtml-tableextract-perl libmime-lite-perl
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#
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# Downloads, caches, parses and prints the current load shedding schedule in Cape Town
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# Written by Timothy Allen <tallen@allafrica.com>
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use strict;
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use warnings;
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use Getopt::Long;
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use LWP::Simple;
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use MIME::Lite;
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use Time::Piece;
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use Time::Seconds;
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use List::MoreUtils;
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use HTML::TableExtract;
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my $url = "http://www.capetown.gov.za/en/electricity/Pages/LoadShedding.aspx";
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my $schedule_file = "$ENV{HOME}/.loadshedding_schedule";
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my @recipients = ();
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my @zones;
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my $verbose = 0;
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GetOptions(
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"t|to=s{1,}" => \@recipients,
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"v|verbose" => \$verbose,
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"z|zones=i{1,}" => \@zones,
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) or die "Usage: $0 [-t <email address> ... ] -z <zone number> ...\n";
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if (scalar @zones < 1) {
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die "Usage: $0 -z <zone numbers>\n";
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}
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my ($last_schedule, $current_schedule, $last_str, $current_str, $last_time, $current_time, $diff);
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$current_time = localtime;
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$current_str = $current_time->strftime('%Y-%m-%dT%H:%M:%S%z');
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if (-f $schedule_file) {
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open STATUS, "<", $schedule_file or die $!;
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my @lines = <STATUS>;
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close STATUS or die $!;
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chomp($last_str = $lines[0]) if ($lines[0] =~ s#^\s*Time:\s*##i);
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chomp($last_schedule = join "\n", @lines);
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if ($last_str && $last_str =~ /\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\+\d{4}/) {
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$last_time = Time::Piece->strptime($last_str, '%Y-%m-%dT%H:%M:%S%z') or warn "Time error";
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$diff = $current_time - $last_time;
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} else {
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undef $last_str;
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}
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}
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# Only refetch the page every hour
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my $cached = 0;
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if (!$last_str || int($diff->hours) >= 1) {
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my $content = LWP::Simple::get $url or die "Couldn't get $url";
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if ($content =~ m#<div[^>]*id="WebPartWPQ2"[^>]*>\s*(<table[^>]*>.*?</table>)#ims) {
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$current_schedule = $1;
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} else {
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die "Unable to parse schedule; load shedding page must have changed.\n";
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}
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open STATUS, ">", $schedule_file or die $!;
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print STATUS "Time: $current_str\n";
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print STATUS "$current_schedule\n";
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close STATUS or die $!;
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} else {
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$current_schedule = $last_schedule;
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$cached = 1;
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}
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my ($html, $table);
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$current_schedule =~ s#<.?span[^>]*>##imsg;
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$current_schedule =~ s#\s*(<[^>]*>)\s*#$1#imsg;
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$html = HTML::TableExtract->new(
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br_translate => 0,
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);
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$html->parse($current_schedule);
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if (scalar $html->tables() < 1) {
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unlink $schedule_file if (-f $schedule_file);
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die "No table found";
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}
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$table = $html->first_table_found();
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# Create a hash (ref) of hash (ref)s with the load shedding info
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my $shedding = {};
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my ($title, $header_row, @rows) = $table->rows;
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my ($empty, @headers) = @$header_row;
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foreach my $row (@rows) {
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my $zone_times = {};
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my ($stage, @times) = @$row;
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foreach my $i (0 .. $#headers) {
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my $key = $headers[$i];
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$zone_times->{$key} = $times[$i];
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}
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$shedding->{$stage} = $zone_times;
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}
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my $day = shift @$title;
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$day =~ s/.*?(\d+\s+(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec).*?\s+\d{4}?).*?/$1/ or undef $day;
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my $subject = "Load shedding times";
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$subject .= " for $day" if defined $day;
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my $output = "If there is load shedding today";
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$output .= " ($day)" if defined $day;
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$output .= ", it will be on the following schedule. We will alert you if and when the City of Cape Town website announces the actual commencement of load shedding.\n\n";
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foreach my $zone (List::MoreUtils::uniq @zones) {
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$output .= "Load shedding hours for zone $zone";
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$output .= " on $day" if defined $day;
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$output .= "\n";
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foreach my $stage (sort keys %$shedding) {
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# Get applicable sets of hours for this zone in each stage
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my @hours;
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foreach my $key (sort keys %{$shedding->{$stage}}) {
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push @hours, $key if grep /\b$zone\b/, $shedding->{$stage}->{$key};
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}
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$output .= sprintf "%-10s ", "$stage:";
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if (scalar @hours > 0) {
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my $str = join ", ", @hours;
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$str =~ s/(.*),/$1 and/;
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$output .= "$str\n";
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} else {
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$output .= "No load shedding in zone $zone";
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$output .= " for $day" if defined $day;
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$output .= "\n";
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}
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}
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$output .= "\n";
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}
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if ($cached) {
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$output .= "Time since last schedule download: " . $diff->pretty . "\n" if $verbose;
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}
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if (scalar @recipients < 1) {
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print $output;
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} else {
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foreach my $to (@recipients) {
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my $message = MIME::Lite->new(
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From => 'Loadshedding Alerts <load@node.org.za>',
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To => $to,
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Subject => $subject,
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Data => $output,
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);
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# send the message
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$message->send();
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}
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}
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# vim: set indentexpr= expandtab sw=2 softtabstop=2 tw=10000 :
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@ -0,0 +1,94 @@
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#!/usr/bin/perl
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#
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# Downloads, parses and prints the current load shedding status.
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# It is suggested that you run this script every 5-20 minutes.
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#
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# Written by Timothy Allen <tallen@allafrica.com>
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use strict;
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use warnings;
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use Getopt::Long;
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use LWP::Simple;
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use MIME::Lite;
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use Time::Piece;
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use Time::Seconds;
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my $url = "http://www.capetown.gov.za/en/electricity/Pages/LoadShedding.aspx";
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my $status_file = "$ENV{HOME}/.loadshedding_status";
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my @recipients = ();
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my $verbose = 0;
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GetOptions(
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"t|to=s{1,}" => \@recipients,
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"v|verbose" => \$verbose,
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) or die "Usage: $0 [-t <email address> ... ] \n";
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my ($last_status, $current_status, $last_str, $current_str, $last_time, $current_time, $diff);
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$current_time = localtime;
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$current_str = $current_time->strftime('%Y-%m-%dT%H:%M:%S%z');
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if (-f $status_file) {
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open STATUS, "<", $status_file or die $!;
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my @lines = <STATUS>;
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close STATUS or die $!;
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chomp($last_status = $lines[0]) if ($lines[0] =~ s#^\s*Status:\s*##i);
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chomp($last_str = $lines[1]) if ($lines[1] =~ s#^\s*Time:\s*##i);
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if ($last_str) {
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$last_time = Time::Piece->strptime($last_str, '%Y-%m-%dT%H:%M:%S%z');
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$diff = $current_time - $last_time;
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}
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}
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my ($content, $output);
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unless ($content = get $url) {
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warn "Couldn't get $url";
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$content = get "http://www.capetown.gov.za/loadshedding/Loadshedding.html" or die "Couldn't get alternate url";
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}
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if ($content =~ m#<div[^>]*id="WebPartWPQ3"[^>]*>.*?<table[^>]*>(.*?)</table>#ims) {
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$current_status = $1;
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$current_status =~ s#\s*(<br[^>]*>|\n)\s*# #imsg;
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$current_status =~ s#<.*?>##imsg;
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} elsif ($content =~ m#<div[^>]*class="MainHeadText"[^>]*>.{0,1500}?<div style="display:block" class="alertbox">(.*?)</div>#ims) {
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$current_status = $1;
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$current_status =~ s#\s*(<br[^>]*>|\n)\s*# #imsg;
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$current_status =~ s#<.*?>##imsg;
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} else {
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die "Unable to parse status; load shedding page must have changed.\n";
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}
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if (($current_status !~ /no items/i) &&
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(!defined $last_status || $current_status ne $last_status)) {
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open STATUS, ">", $status_file or die $!;
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print STATUS "Status: $current_status\n";
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print STATUS "Time: $current_str\n";
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close STATUS or die $!;
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if (defined $last_status) {
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$output .= "The City of Cape Town's website indicates that the load shedding status has changed from: $last_status to: $current_status\n";
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} else {
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$output .= "Load shedding status for the City of Cape Town: $current_status\n";
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}
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$output .= "Time since last change: " . $diff->pretty . "\n" if defined $diff and $verbose;
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} else {
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$output .= "Load shedding status: $current_status\n" if $verbose;
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}
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if (defined $output) {
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if (scalar @recipients < 1) {
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print $output;
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} else {
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foreach my $to (@recipients) {
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my $message = MIME::Lite->new(
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From => 'Loadshedding Alerts <load@node.org.za>',
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To => $to,
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Subject => 'Load shedding status change',
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Data => $output,
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);
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# send the message
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$message->send();
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}
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}
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}
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# vim: set indentexpr= expandtab sw=2 softtabstop=2 tw=10000 :
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