5d910510b8
RevBank reads the new products file on every interaction (e.g. pressing enter), and then fires hooks like `product_changed`. Every running instance gets those hooks, but the price tage should be generated only once.
105 lines
2.1 KiB
Perl
105 lines
2.1 KiB
Perl
#!perl
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use RevBank::Products qw(read_products);
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use FindBin qw($Bin);
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my $fn = "revbank.oepl";
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my $hex = '[0-9A-F]';
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my $mac_regex = qr/^(?:$hex {12}|$hex {14}|$hex {16})$/x;
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sub _create() {
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open my $fh, '>>', $fn;
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}
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sub _run(@args) {
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local $ENV{REVBANK_SKIP_LOCK} = 1;
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system perl => "$Bin/contrib/openepaperlink.pl", @args;
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}
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sub _read_oepl() {
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return { map { (split " ")[0, 1] } slurp $fn };
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}
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sub _touch() {
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utime undef, undef, $fn;
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}
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sub command :Tab(openepaperlink) ($self, $cart, $command, @) {
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if ($command =~ $mac_regex) {
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my $mac2product = _read_oepl;
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return REDO, $mac2product->{$command} if exists $mac2product->{$command};
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}
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$command eq 'openepaperlink' or return NEXT;
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return "Product ID (or 'unlink')", sub ($self, $cart, $product_id, @) {
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my $product;
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if ($product_id ne 'unlink') {
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$product = read_products->{$product_id} or return REJECT, "No such product.";
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$product_id = $product->{id}; # don't use alias
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}
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return "Tag MAC", sub ($self, $cart, $mac, @) {
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$mac =~ $mac_regex or return REJECT, "Malformed MAC.";
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_create;
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my $found = 0;
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rewrite $fn, sub($line) {
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my ($m) = split " ", $line;
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return $line if $m ne $mac;
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$found++;
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return undef if $product_id eq 'unlink';
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return "$mac $product_id\n" if $m eq $mac;
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};
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if (!$found and $product_id ne 'unlink') {
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append $fn, "$mac $product_id\n";
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}
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_run $mac;
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return ACCEPT;
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};
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};
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}
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sub hook_product_deleted($class, $product, $mtime, @) {
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my $product_id = $product->{id};
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-f $fn or return;
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return with_lock {
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$mtime >= (stat $fn)[9] or return;
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my @macs;
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rewrite $fn, sub($line) {
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my ($mac, $id, $hwtype) = split " ", $line;
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if ($id eq $product_id) {
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push @macs, $mac;
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return "$mac _DELETED_ $hwtype\n"
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}
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return $line;
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};
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@macs or return;
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_run @macs;
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sleep 1 if $mtime == time;
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_touch;
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};
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}
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sub hook_product_changed($class, $old, $new, $mtime, @) {
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-f $fn or return;
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return with_lock {
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$mtime >= (stat $fn)[9] or return;
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my $product2mac = { reverse %{ _read_oepl() } };
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$product2mac->{ $new->{id} } or return;
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_run $new->{id};
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sleep 1 if $mtime == time;
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_touch;
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};
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}
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