Capture logs for the LTIMassUpdate task and return them for the job r…

…esult.

Note that the job will still succeed but now some failures/messages will
appear in the job result.  If `debug_lti_grade_passback` or
`debug_lti_parameters` are enabled then the job result will now be
rather extensive.  Everything that is sent to the log will be in result.

lib/Mojolicious/WeBWorK/Tasks/LTIMassUpdate.pm

@@ -39,6 +39,14 @@ sub run ($job, $userID = '', $setID = '') {
 	my $db = WeBWorK::DB->new($ce->{dbLayout});
 	return $job->fail($job->maketext('Could not obtain database connection.')) unless $db;
 
+	my @messages;
+	$job->app->log->on(
+		message => sub {
+			my ($log, $level, @lines) = @_;
+			push @messages, $lines[-1];
+		}
+	);
+
 	# Pass a fake controller object that will work for the grader.
 	my $grader =
 		$ce->{LTIVersion} eq 'v1p1'
@@ -72,14 +80,16 @@ sub run ($job, $userID = '', $setID = '') {
 	}
 
 	if ($setID && $userID && $ce->{LTIGradeMode} eq 'homework') {
-		return $job->finish($job->maketext('Updated grades via LTI for user [_1] and set [_2].', $userID, $setID));
+		unshift(@messages, $job->maketext('Updated grades via LTI for user [_1] and set [_2].', $userID, $setID));
 	} elsif ($setID && $ce->{LTIGradeMode} eq 'homework') {
-		return $job->finish($job->maketext('Updated grades via LTI all users assigned to set [_1].', $setID));
+		unshift(@messages, $job->maketext('Updated grades via LTI all users assigned to set [_1].', $setID));
 	} elsif ($userID) {
-		return $job->finish($job->maketext('Updated grades via LTI of all sets assigned to user [_1].', $userID));
+		unshift(@messages, $job->maketext('Updated grades via LTI of all sets assigned to user [_1].', $userID));
 	} else {
-		return $job->finish($job->maketext('Updated grades via LTI for all sets and users.'));
+		unshift(@messages, $job->maketext('Updated grades via LTI for all sets and users.'));
 	}
+
+	return $job->finish(@messages > 1 ? \@messages : $messages[0]);
 }
 
 sub maketext ($job, @args) {