[PATCH 18/18] gitweb: Add better error handling for gitweb caching

["John 'Warthog9' Hawley" <warthog9@eaglescrag.net>]

This basically finishes the plumbing for caching the error pages
as the are generated.

If an error is hit, create a <hash>.err file with the error.  This
will interrupt all currently waiting processes and they will display
the error, without any additional refreshing.

On a new request a generation will be attempted, should it succed the
<hash.err> file is removed (if it exists).

Signed-off-by: John 'Warthog9' Hawley <warthog9@eaglescrag.net>
---
 gitweb/gitweb.perl  |    8 ++++++++
 gitweb/lib/cache.pl |   14 ++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/gitweb/gitweb.perl b/gitweb/gitweb.perl
index d39982a..5a9660a 100755
--- a/gitweb/gitweb.perl
+++ b/gitweb/gitweb.perl
@@ -41,6 +41,7 @@ our $version = "++GIT_VERSION++";
 
 # Output buffer variable
 our $output = "";
+our $output_err = "";
 
 our ($my_url, $my_uri, $base_url, $path_info, $home_link);
 sub evaluate_uri {
@@ -303,6 +304,9 @@ our $fullhashpath = *STDOUT;
 our $fullhashbinpath = *STDOUT;
 our $fullhashbinpathfinal = *STDOUT;
 
+our $cacheErrorCache = 0; # false
+our $cacheErrorCount = 0;
+
 our $full_url;
 our $urlhash;
 
@@ -3786,6 +3790,7 @@ sub die_error {
 	# Reset the output so that we are actually going to STDOUT as opposed
 	# to buffering the output.
 	reset_output() if ($cache_enable && ! $cacheErrorCache);
+	$cacheErrorCount++ if( $cacheErrorCache );
 
 	git_header_html($http_responses{$status}, undef, %opts);
 	print <<EOF;
@@ -3801,6 +3806,9 @@ EOF
 	print "</div>\n";
 
 	git_footer_html();
+
+	die_error_cache($output) if ( $cacheErrorCache );
+
 	goto DONE_GITWEB
 		unless ($opts{'-error_handler'});
 }
diff --git a/gitweb/lib/cache.pl b/gitweb/lib/cache.pl
index 6cb82c8..2e7ca69 100644
--- a/gitweb/lib/cache.pl
+++ b/gitweb/lib/cache.pl
@@ -240,8 +240,14 @@ sub cacheUpdate {
 	# Trap all output from the action
 	change_output();
 
+	# Set the error handler so we cache
+	$cacheErrorCache = 1; # true
+
 	$actions{$action}->();
 
+	# Reset Error Handler to not cache
+	$cacheErrorCache = 0; # false
+
 	# Reset the outputs as we should be fine now
 	reset_output();
 
@@ -295,6 +301,8 @@ sub cacheUpdate {
 		close($cacheFileBG);
 	}
 
+	unlink("$fullhashpath.err") if (-e "$fullhashpath.err");
+
 	if ( $areForked ){
 		exit(0);
 	} else {
@@ -339,6 +347,9 @@ sub cacheWaitForUpdate {
 	my $max = 10;
 	my $lockStat = 0;
 
+	# Call cacheDisplayErr - if an error exists it will display and die.  If not it will just return
+	cacheDisplayErr($action);
+
 	if( $backgroundCache ){
 		if( -e "$fullhashpath" ){
 			open($cacheFile, '<:utf8', "$fullhashpath");
@@ -402,6 +413,9 @@ EOF
 		close($cacheFile);
 		$x++;
 		$combinedLockStat = $lockStat;
+
+		# Call cacheDisplayErr - if an error exists it will display and die.  If not it will just return
+		cacheDisplayErr($action);
 	} while ((! $combinedLockStat) && ($x < $max));
 	print <<EOF;
 </body>
-- 
1.7.2.3