+ my $timestamp=undef;
+ foreach my $feed (keys %feeds) {
+ my $t=$feeds{$feed}->{lastupdate}+$feeds{$feed}->{updateinterval};
+ if (! defined $timestamp || $timestamp > $t) {
+ $timestamp=$t;
+ }
+ }
+ $newfile=~s/\.new$/time/;
+ open (OUT, ">", $newfile) || error("open $newfile: $!", $cleanup);
+ if (defined $timestamp) {
+ print OUT $timestamp."\n";
+ }
+ close OUT || error("save $newfile: $!", $cleanup);
+}
+
+sub garbage_collect () {
+ foreach my $name (keys %feeds) {
+ # remove any feeds that were not seen while building the pages
+ # that used to contain them
+ if ($feeds{$name}->{unseen}) {
+ delete $feeds{$name};
+ }
+ }
+
+ foreach my $guid (values %guids) {
+ # any guid whose feed is gone should be removed
+ if (! exists $feeds{$guid->{feed}}) {
+ if (exists $guid->{page}) {
+ unlink $IkiWiki::Plugin::transient::transientdir."/".htmlfn($guid->{page})
+ || unlink "$config{srcdir}/".htmlfn($guid->{page});
+ }
+ delete $guids{$guid->{guid}};
+ }
+ # handle expired guids
+ elsif ($guid->{expired} && exists $guid->{page}) {
+ unlink "$config{srcdir}/".htmlfn($guid->{page});
+ unlink $IkiWiki::Plugin::transient::transientdir."/".htmlfn($guid->{page});
+ delete $guid->{page};
+ delete $guid->{md5};
+ }
+ }
+}
+
+sub mergestate () {
+ # Load the current state in from disk, and merge into it
+ # values from the state in memory that might have changed
+ # during aggregation.
+ my %myfeeds=%feeds;
+ my %myguids=%guids;
+ clearstate();
+ loadstate();
+
+ # All that can change in feed state during aggregation is a few
+ # fields.
+ foreach my $name (keys %myfeeds) {
+ if (exists $feeds{$name}) {
+ foreach my $field (qw{message lastupdate lasttry
+ numposts newposts error}) {
+ $feeds{$name}->{$field}=$myfeeds{$name}->{$field};
+ }
+ }
+ }
+
+ # New guids can be created during aggregation.
+ # Guids have a few fields that may be updated during aggregation.
+ # It's also possible that guids were removed from the on-disk state
+ # while the aggregation was in process. That would only happen if
+ # their feed was also removed, so any removed guids added back here
+ # will be garbage collected later.
+ foreach my $guid (keys %myguids) {
+ if (! exists $guids{$guid}) {
+ $guids{$guid}=$myguids{$guid};
+ }
+ else {
+ foreach my $field (qw{md5}) {
+ $guids{$guid}->{$field}=$myguids{$guid}->{$field};
+ }
+ }
+ }
+}
+
+sub clearstate () {