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example/lava_lamp.pl  view on Meta::CPAN

# ============================================================================
# End of configuration

use Storable qw(fd_retrieve store_fd store retrieve);
use Data::Dumper;
use feature qw(say);
use Fcntl qw(:flock);
use Getopt::Long;
use strict;

my %opts = ();
GetOptions(\%opts, 'type=s','mode=s','debug!','name=s','label=s','config=s');

my $DEBUG = $opts{debug};
read_config_file($opts{config}) if $opts{config};
init_status();

my $mode = $opts{'mode'} || "list";

# List mode doesnt need a connection
list() and exit if $mode eq "list";

# Open status and lock
my $status = fetch_status();

# Name and connection parameters
my $lamp = open_lamp($SWITCH_CONFIG,$opts{name});

# Check current switch state    
my $is_on = $lamp->is_on();

# Log a manual switch which might has happened in between checks or notification
log_manual_switch($status,$is_on);

if ($mode eq "watch") {
   # Watchdog mode If the lamp is on but out of the period, switch it
    # off. Also, if it is running alredy for too long. $off_file can be used 
    # to switch it always off.
    my $in_period = check_on_period();
    if ($is_on && (-e $OFF_FILE || 
                   !$in_period || 
                   lamp_on_for_too_long($status))) {
        # Switch off lamp whether the stop file is switched on when we are off the
        # time window    
        $lamp->off();
        update_status($status,0,$mode);
    } elsif (!$is_on && $in_period && has_trigger($status)) {
        $lamp->on();
        update_status($status,1,"notif",undef,trigger_label($status));
        delete_trigger($status);
    }
} elsif ($mode eq "notif") {
    my $type = $opts{type} || die "No notification type given";
    if (lc($type) =~ /^(problem|custom)$/ && !$is_on) {
        if (check_on_period()) {
            # If it is a problem and the lamp is not on, switch it on, 
            # but only if the lamp is not 'hot' (i.e. was not switch off only 
            # $LAMP_REST_TIME
            my $last_hist = get_last_entry($status);
            my $rest_time = time - $LAMP_REST_TIME;
            if (!$last_hist || $last_hist->[0] < $rest_time) {
                $lamp->on();
                update_status($status,1,$mode,time,$opts{label});
            } else {
                info("Lamp not switched on because the lamp was switched off just before ",
                     time - $last_hist->[0]," seconds");
            }
        } else {
            # Notification received offtime, remember to switch on the lamp
            # when in time
            info("Notification received in an off-period: type = ",$type," | ",$opts{label});
            set_trigger($status,$opts{label});
        }
    } elsif (lc($type) eq 'recovery') {
        if ($is_on) {
            # If it is a recovery switch it off
            $lamp->off();
            update_status($status,0,$mode,time,$opts{label});
        } else {
            # It's already off, but remove any trigger marker
            delete_trigger($status);
        }
    } else {
        info("Notification: No state change. Type = ",$type,", State = ",$is_on ? "On" : "Off",
            " | Check Period: ",check_on_period());
    }
} else {
    die "Unknow mode '",$mode,"'";
}

if ($DEBUG) {
    info(Dumper($status));
}

# Logout, we are done
close_lamp($lamp);

store_status($status);

# ================================================================================================

sub info {
    if (open (F,">>$LOG_FILE")) {
        print F scalar(localtime),": ",join("",@_),"\n";
        close F;
    }
}

# List the status file
sub list {
    my $status = retrieve $STATUS_FILE;
    my $hist_entries = $status->{hist};
    for my $hist (@{$hist_entries}) {
        print scalar(localtime($hist->[0])),": ",$hist->[1] ? "On " : "Off"," -- ",$hist->[2]," : ",$hist->[3],"\n";
    }
    print "Content: ",Dumper($status) if $DEBUG;
    return 1;
} 

# Create empty status file if necessary
sub init_status {