]> git.vanrenterghem.biz Git - git.ikiwiki.info.git/blobdiff - IkiWiki/Plugin/aggregate.pm
Merge branch 'aggregateinternal'
[git.ikiwiki.info.git] / IkiWiki / Plugin / aggregate.pm
index 2a4d10411dab8ac87655e6101f20f7dff1c8bd3f..2fcdec9e73d71ad303ff4f807d8f81a9bcc58248 100644 (file)
@@ -1,13 +1,13 @@
 #!/usr/bin/perl
-# Blog aggregation plugin.
+# Feed aggregation plugin.
 package IkiWiki::Plugin::aggregate;
 
 use warnings;
 use strict;
 use IkiWiki 2.00;
-use HTML::Entities;
 use HTML::Parser;
 use HTML::Tagset;
+use HTML::Entities;
 use URI;
 use open qw{:utf8 :std};
 
@@ -21,56 +21,159 @@ sub import { #{{{
        hook(type => "preprocess", id => "aggregate", call => \&preprocess);
         hook(type => "delete", id => "aggregate", call => \&delete);
        hook(type => "savestate", id => "aggregate", call => \&savestate);
+       hook(type => "htmlize", id => "_aggregated", call => \&htmlize);
+       if (exists $config{aggregate_webtrigger} && $config{aggregate_webtrigger}) {
+               hook(type => "cgi", id => "aggregate", call => \&cgi);
+       }
 } # }}}
 
 sub getopt () { #{{{
         eval q{use Getopt::Long};
        error($@) if $@;
         Getopt::Long::Configure('pass_through');
-        GetOptions("aggregate" => \$config{aggregate});
+        GetOptions(
+               "aggregate" => \$config{aggregate},
+               "aggregateinternal!" => \$config{aggregateinternal},
+       );
 } #}}}
 
 sub checkconfig () { #{{{
        if ($config{aggregate} && ! ($config{post_commit} && 
                                     IkiWiki::commit_hook_enabled())) {
-               if (! IkiWiki::lockwiki(0)) {
-                       debug("wiki is locked by another process, not aggregating");
-                       exit 1;
-               }
-               
-               # Fork a child process to handle the aggregation.
-               # The parent process will then handle building the result.
-               # This avoids messy code to clear state accumulated while
-               # aggregating.
-               defined(my $pid = fork) or error("Can't fork: $!");
-               if (! $pid) {
-                       loadstate();
+               launchaggregation();
+       }
+} #}}}
+
+sub cgi ($) { #{{{
+       my $cgi=shift;
+
+       if (defined $cgi->param('do') &&
+           $cgi->param("do") eq "aggregate_webtrigger") {
+               $|=1;
+               print "Content-Type: text/plain\n\n";
+               $config{cgi}=0;
+               $config{verbose}=1;
+               $config{syslog}=0;
+               print gettext("Aggregation triggered via web.")."\n\n";
+               if (launchaggregation()) {
+                       IkiWiki::lockwiki();
                        IkiWiki::loadindex();
-                       aggregate();
-                       expire();
-                       savestate();
-                       exit 0;
+                       require IkiWiki::Render;
+                       IkiWiki::refresh();
+                       IkiWiki::saveindex();
                }
-               waitpid($pid,0);
-               if ($?) {
-                       error "aggregation failed with code $?";
+               else {
+                       print gettext("Nothing to do right now, all feeds are up-to-date!")."\n";
                }
+               exit 0;
+       }
+} #}}}
+
+sub launchaggregation () { #{{{
+       # See if any feeds need aggregation.
+       loadstate();
+       my @feeds=needsaggregate();
+       return unless @feeds;
+       if (! lockaggregate()) {
+               debug("an aggregation process is already running");
+               return;
+       }
+       # force a later rebuild of source pages
+       $IkiWiki::forcerebuild{$_->{sourcepage}}=1
+               foreach @feeds;
+
+       # Fork a child process to handle the aggregation.
+       # The parent process will then handle building the
+       # result. This avoids messy code to clear state
+       # accumulated while aggregating.
+       defined(my $pid = fork) or error("Can't fork: $!");
+       if (! $pid) {
+               IkiWiki::loadindex();
+               # Aggregation happens without the main wiki lock
+               # being held. This allows editing pages etc while
+               # aggregation is running.
+               aggregate(@feeds);
+
+               IkiWiki::lockwiki;
+               # Merge changes, since aggregation state may have
+               # changed on disk while the aggregation was happening.
+               mergestate();
+               expire();
+               savestate();
+               IkiWiki::unlockwiki;
+               exit 0;
+       }
+       waitpid($pid,0);
+       if ($?) {
+               error "aggregation failed with code $?";
+       }
+
+       clearstate();
+       unlockaggregate();
+
+       return 1;
+} #}}}
+
+#  Pages with extension _aggregated have plain html markup, pass through.
+sub htmlize (@) { #{{{
+       my %params=@_;
+       return $params{content};
+} #}}}
+
+# Used by ikiwiki-transition aggregateinternal.
+sub migrate_to_internal { #{{{
+       if (! lockaggregate()) {
+               error("an aggregation process is currently running");
+       }
+
+       IkiWiki::lockwiki();
+       loadstate();
+       $config{verbose}=1;
+
+       foreach my $data (values %guids) {
+               next unless $data->{page};
+               
+               $config{aggregateinternal} = 0;
+               my $oldname = pagefile($data->{page});
+               
+               $config{aggregateinternal} = 1;
+               my $newname = pagefile($data->{page});
                
-               IkiWiki::unlockwiki();
+               debug "moving $oldname -> $newname";
+               if (-e $newname) {
+                       if (-e $oldname) {
+                               error("$newname already exists");
+                       }
+                       else {
+                               debug("already renamed to $newname?");
+                       }
+               }
+               elsif (-e $oldname) {
+                       rename($oldname, $newname) || error("$!");
+               }
+               else {
+                       debug("$oldname not found");
+               }
        }
+       
+       savestate();
+       IkiWiki::unlockwiki;
+       
+       unlockaggregate();
 } #}}}
 
 sub needsbuild (@) { #{{{
        my $needsbuild=shift;
        
-       loadstate(); # if not already loaded
+       loadstate();
 
        foreach my $feed (values %feeds) {
                if (exists $pagesources{$feed->{sourcepage}} && 
                    grep { $_ eq $pagesources{$feed->{sourcepage}} } @$needsbuild) {
-                       # Mark all feeds originating on this page as removable;
-                       # preprocess will unmark those that still exist.
-                       remove_feeds($feed->{sourcepage});
+                       # Mark all feeds originating on this page as 
+                       # not yet seen; preprocess will unmark those that
+                       # still exist.
+                       markunseen($feed->{sourcepage});
                }
        }
 } # }}}
@@ -80,7 +183,7 @@ sub preprocess (@) { #{{{
 
        foreach my $required (qw{name url}) {
                if (! exists $params{$required}) {
-                       return "[[aggregate ".sprintf(gettext("missing %s parameter"), $required)."]]";
+                       error sprintf(gettext("missing %s parameter"), $required)
                }
        }
 
@@ -103,8 +206,14 @@ sub preprocess (@) { #{{{
        $feed->{updateinterval}=defined $params{updateinterval} ? $params{updateinterval} * 60 : 15 * 60;
        $feed->{expireage}=defined $params{expireage} ? $params{expireage} : 0;
        $feed->{expirecount}=defined $params{expirecount} ? $params{expirecount} : 0;
-       delete $feed->{remove};
-       delete $feed->{expired};
+        if (exists $params{template}) {
+                $params{template}=~s/[^-_a-zA-Z0-9]+//g;
+        }
+        else {
+                $params{template} = "aggregatepost"
+        }
+       $feed->{template}=$params{template} . ".tmpl";
+       delete $feed->{unseen};
        $feed->{lastupdate}=0 unless defined $feed->{lastupdate};
        $feed->{numposts}=0 unless defined $feed->{numposts};
        $feed->{newposts}=0 unless defined $feed->{newposts};
@@ -134,11 +243,22 @@ sub delete (@) { #{{{
        # Remove feed data for removed pages.
        foreach my $file (@files) {
                my $page=pagename($file);
-               remove_feeds($page);
+               markunseen($page);
+       }
+} #}}}
+
+sub markunseen ($) { #{{{
+       my $page=shift;
+
+       foreach my $id (keys %feeds) {
+               if ($feeds{$id}->{sourcepage} eq $page) {
+                       $feeds{$id}->{unseen}=1;
+               }
        }
 } #}}}
 
 my $state_loaded=0;
+
 sub loadstate () { #{{{
        return if $state_loaded;
        $state_loaded=1;
@@ -177,32 +297,11 @@ sub loadstate () { #{{{
 
 sub savestate () { #{{{
        return unless $state_loaded;
-       eval q{use HTML::Entities};
-       error($@) if $@;
+       garbage_collect();
        my $newfile="$config{wikistatedir}/aggregate.new";
        my $cleanup = sub { unlink($newfile) };
        open (OUT, ">$newfile") || error("open $newfile: $!", $cleanup);
        foreach my $data (values %feeds, values %guids) {
-               if ($data->{remove}) {
-                       if ($data->{name}) {
-                               foreach my $guid (values %guids) {
-                                       if ($guid->{feed} eq $data->{name}) {
-                                               $guid->{remove}=1;
-                                       }
-                               }
-                       }
-                       else {
-                               unlink pagefile($data->{page})
-                                       if exists $data->{page};
-                       }
-                       next;
-               }
-               elsif ($data->{expired} && exists $data->{page}) {
-                       unlink pagefile($data->{page});
-                       delete $data->{page};
-                       delete $data->{md5};
-               }
-
                my @line;
                foreach my $field (keys %$data) {
                        if ($field eq "name" || $field eq "feed" ||
@@ -223,6 +322,69 @@ sub savestate () { #{{{
                error("rename $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}}) {
+                       unlink pagefile($guid->{page})
+                               if exists $guid->{page};
+                       delete $guids{$guid->{guid}};
+               }
+               # handle expired guids
+               elsif ($guid->{expired} && exists $guid->{page}) {
+                       unlink pagefile($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 numposts
+                                             newposts error}) {
+                               $feeds{$name}->{$field}=$myfeeds{$name}->{$field};
+                       }
+               }
+       }
+
+       # New guids can be created 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};
+               }
+       }
+} #}}}
+
+sub clearstate () { #{{{
+       %feeds=();
+       %guids=();
+       $state_loaded=0;
+} #}}}
+
 sub expire () { #{{{
        foreach my $feed (values %feeds) {
                next unless $feed->{expireage} || $feed->{expirecount};
@@ -254,23 +416,23 @@ sub expire () { #{{{
        }
 } #}}}
 
-sub aggregate () { #{{{
+sub needsaggregate () { #{{{
+       return values %feeds if $config{rebuild};
+       return grep { time - $_->{lastupdate} >= $_->{updateinterval} } values %feeds;
+} #}}}
+
+sub aggregate (@) { #{{{
        eval q{use XML::Feed};
        error($@) if $@;
        eval q{use URI::Fetch};
        error($@) if $@;
-       eval q{use HTML::Entities};
-       error($@) if $@;
 
-       foreach my $feed (values %feeds) {
-               next unless $config{rebuild} || 
-                       time - $feed->{lastupdate} >= $feed->{updateinterval};
+       foreach my $feed (@_) {
                $feed->{lastupdate}=time;
                $feed->{newposts}=0;
                $feed->{message}=sprintf(gettext("processed ok at %s"),
                        displaytime($feed->{lastupdate}));
                $feed->{error}=0;
-               $IkiWiki::forcerebuild{$feed->{sourcepage}}=1;
 
                debug(sprintf(gettext("checking feed %s ..."), $feed->{name}));
 
@@ -304,14 +466,14 @@ sub aggregate () { #{{{
                        # that contains invalid UTF-8 sequences. Convert
                        # feed to ascii to try to work around.
                        $feed->{message}.=" ".sprintf(gettext("(invalid UTF-8 stripped from feed)"));
-                       $content=Encode::decode_utf8($content);
+                       $content=Encode::decode_utf8($content, 0);
                        $f=eval{XML::Feed->parse(\$content)};
                }
                if ($@) {
                        # Another possibility is badly escaped entities.
                        $feed->{message}.=" ".sprintf(gettext("(feed entities escaped)"));
                        $content=~s/\&(?!amp)(\w+);/&$1;/g;
-                       $content=Encode::decode_utf8($content);
+                       $content=Encode::decode_utf8($content, 0);
                        $f=eval{XML::Feed->parse(\$content)};
                }
                if ($@) {
@@ -334,7 +496,7 @@ sub aggregate () { #{{{
                                title => defined $entry->title ? decode_entities($entry->title) : "untitled",
                                link => $entry->link,
                                content => defined $entry->content->body ? $entry->content->body : "",
-                               guid => defined $entry->id ? $entry->id : time."_".$feed->name,
+                               guid => defined $entry->id ? $entry->id : time."_".$feed->{name},
                                ctime => $entry->issued ? ($entry->issued->epoch || time) : time,
                        );
                }
@@ -404,7 +566,7 @@ sub add_page (@) { #{{{
        $guid->{md5}=$digest;
 
        # Create the page.
-       my $template=template("aggregatepost.tmpl", blind_cache => 1);
+       my $template=template($feed->{template}, blind_cache => 1);
        $template->param(title => $params{title})
                if defined $params{title} && length($params{title});
        $template->param(content => htmlescape(htmlabs($params{content}, $feed->{feedurl})));
@@ -478,18 +640,6 @@ sub htmlabs ($$) { #{{{
        return $ret;
 } #}}}
 
-sub remove_feeds () { #{{{
-       my $page=shift;
-
-       my %removed;
-       foreach my $id (keys %feeds) {
-               if ($feeds{$id}->{sourcepage} eq $page) {
-                       $feeds{$id}->{remove}=1;
-                       $removed{$id}=1;
-               }
-       }
-} #}}}
-
 sub pagefile ($) { #{{{
        my $page=shift;
 
@@ -497,7 +647,29 @@ sub pagefile ($) { #{{{
 } #}}}
 
 sub htmlfn ($) { #{{{
-       return shift().".".$config{htmlext};
+       return shift().".".($config{aggregateinternal} ? "_aggregated" : $config{htmlext});
+} #}}}
+
+my $aggregatelock;
+
+sub lockaggregate () { #{{{
+       # Take an exclusive lock to prevent multiple concurrent aggregators.
+       # Returns true if the lock was aquired.
+       if (! -d $config{wikistatedir}) {
+               mkdir($config{wikistatedir});
+       }
+       open($aggregatelock, '>', "$config{wikistatedir}/aggregatelock") ||
+               error ("cannot open to $config{wikistatedir}/aggregatelock: $!");
+       if (! flock($aggregatelock, 2 | 4)) { # LOCK_EX | LOCK_NB
+               close($aggregatelock) || error("failed closing aggregatelock: $!");
+               return 0;
+       }
+       return 1;
+} #}}}
+
+sub unlockaggregate () { #{{{
+       return close($aggregatelock) if $aggregatelock;
+       return;
 } #}}}
 
 1