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example/lava_lamp.pl  view on Meta::CPAN

        my $last = $last_hist->[0];
        my $calc = $now - $MANUAL_DELTA;
        return $calc > $last ? $calc : $now - int(($now - $last) / 2);
    } else {
        return time - $MANUAL_DELTA;
    }
}

sub get_last_entry {
    my $status = shift;
    if ($status) {
        my $hist = $status->{hist};
        return  $hist && @$hist ? $hist->[$#{$hist}] : undef;
    }
    return undef;
}

sub check_on_period {
    my ($min,$hour,$wd) = (localtime)[1,2,6];
    my $day = qw(Sun Mon Tue Wed Thu Fri Sat)[$wd];
    my $periods = $LAMP_ON_TIME_TABLE->{$day};
    for my $period (@$periods) {
        my ($low,$high) = @$period;
        my ($lh,$lm) = split(/:/,$low);
        my ($hh,$hm) = split(/:/,$high);
        my $m = $hour * 60 + $min;
        return 1 if $m >= ($lh * 60 + $lm) && $m <= ($hh * 60 + $hm);
    }
    return 0;
}

sub lamp_on_for_too_long {
    my $status = shift;
    
    # Check if the lamp was on for more than max time in the duration now - max
    # time + 1 hour
    my $current = time;
    my $low_time = $current - $LAMP_MAX_TIME - $LAMP_REST_TIME;
    my $on_time = 0;
    my $hist = $status->{hist};
    my $i = $#{$hist};
    while ($current > $low_time && $i >= 0) {
        my $t = $hist->[$i]->[0];
        $on_time += $current - $t if $hist->[$i]->[1];
        $current = $t;
        $i--;
    }
    if ($on_time >= $LAMP_MAX_TIME) {
        info("Lamp was on for " . $on_time . "s in the last " . ($LAMP_MAX_TIME + $LAMP_REST_TIME) . "s and is switched off now"); 
        return 1;
    } else {
        return 0;
    }
}

sub read_config_file {
    my $file = shift;
    open (F,$file) || die "Cannot read config file ",$file,": ",$!;
    my $config = join "",<F>;
    close F;
    eval $config;
    die "Error evaluating $config: ",$@ if $@;    
}

sub delete_trigger {
    my $status = shift;
    delete $status->{trigger_mark};
    delete $status->{trigger_label};
}

sub set_trigger {
    my $status = shift;
    my $label = shift;
    $status->{trigger_mark} = 1;
    $status->{trigger_label} = $label;
}

sub has_trigger {
    return shift->{trigger_mark};
}

sub trigger_label {
    return shift->{trigger_label};
}

# ====================================================
# Status file handling including locking

my $status_fh;

sub fetch_status {
    open ($status_fh,"+<$STATUS_FILE") || die "Cannot open $STATUS_FILE: $!";
    $status = fd_retrieve($status_fh) || die "Cannot read $STATUS_FILE: $!";
    flock($status_fh,2);
    return $status;
}


sub store_status {
    my $status = shift;
    
    # Truncate history if necessary
    truncate_hist($status);
    # Store status and unlock
    seek($status_fh, 0, 0); truncate($status_fh, 0);
    store_fd $status,$status_fh;
    close $status_fh;    
}

sub truncate_hist {
    my $status = shift;

    my $hist = $status->{hist};
    my $len = scalar(@$hist);
    splice @$hist,0,$len - $MAX_HISTORY_ENTRIES if $len > $MAX_HISTORY_ENTRIES;
    $status->{hist} = $hist;
}

# ==========================================================================
# Customize the following call and class in order to use a different 
# switch than AVM AHA's
sub open_lamp {