Switch sense of adaptive logging. Immediately echo log lines <= max level

and save log lines <= min level.  IIF a message is accepted for delivery,
 then echo out the saved log lines (typically just FROM and TO) with the prefix
 for multilog filtering into independent log files.

 Update POD in logging/adaptive to describe changed behavior as well as give
 an example log/run file to filter the messages accordingly.


git-svn-id: https://svn.perl.org/qpsmtpd/trunk@443 958fd67b-6ff1-0310-b445-bb7760255be9

plugins/logging/adaptive

@@ -25,7 +25,7 @@ sub register {
         }
     }
 
-  $self->{_prefix} = '!';
+    $self->{_prefix} = '`';
     if ( defined $args{prefix} and $args{prefix} =~ /^(.+)$/ ) {
         $self->{_prefix} = $1;
     }
@@ -47,50 +47,51 @@ sub wlog {
     # out this line and it will not cause an infinite loop.
     return DECLINED if defined $plugin and $plugin eq $self->plugin_name;
 
-  push @{$transaction->{_log}}, [$trace, $hook, $plugin, @log];
+    if ( $trace <= $self->{_maxlevel} ) {
+        warn join(
+            " ", $$.
+            (
+                  defined $plugin ? " $plugin plugin:"
+                : defined $hook   ? " running plugin ($hook):"
+                : ""
+            ),
+            @log
+          ),
+          "\n"
+          unless $log[0] =~ /logging::adaptive/;
+        push @{ $transaction->{_log} }, [ $trace, $hook, $plugin, @log ]
+          if ( $trace <= $self->{_minlevel} );
+    }
 
     return DECLINED;
 }
 
 sub dlog {
-  # fires when a message is denied
     my ( $self, $transaction, $prev_hook, $return, $return_text ) = @_;
-  warn join(" ", $$, $self->{_prefix},
+    $self->{_denied} = 1;
-    "Plugin $prev_hook returned",
-    return_code($return).
-    ": '$return_text'"), "\n";
-
-  foreach my $row ( @{$transaction->{_log}} ) {
-      next unless scalar @$row; # skip over empty log lines
-      my ($trace, $hook, $plugin, @log) = @$row;
-      if ($trace <= $self->{_maxlevel}) {
-	  warn 
-	    join(" ", $$, $self->{_prefix}.
-		 (defined $plugin ? " $plugin plugin:" :
-		  defined $hook   ? " running plugin ($hook):"  : ""),
-		 @log), "\n"
-	    unless $log[0] =~ /logging::adaptive/;
-	  # consume any lines you print so that they don't also
-	  # show up as OK lines
-	  $row = []; 
-      }
-  }
-
-  return DECLINED;
 }
 
 sub slog {
+
     # fires when a message is accepted
     my ( $self, $transaction, @args ) = @_;
 
+    return DECLINED if $self->{_denied};
+
     foreach my $row ( @{ $transaction->{_log} } ) {
         next unless scalar @$row;    # skip over empty log lines
         my ( $trace, $hook, $plugin, @log ) = @$row;
-	warn 
+        warn join(
-	    join(" ", $$ .
+            " ", $$,
-		 (defined $plugin ? " $plugin plugin:" :
+            $self->{_prefix}.
-		  defined $hook   ? " running plugin ($hook):"  : ""),
+            (
-		 @log), "\n"
+                  defined $plugin ? " $plugin plugin:"
+                : defined $hook   ? " running plugin ($hook):"
+                : ""
+            ),
+            @log
+          ),
+          "\n"
           if ( $trace <= $self->{_minlevel} );
     }
 
@@ -99,6 +100,7 @@ sub slog {
 
 =cut
 
+
 =head1 NAME
 
 adaptive - An adaptive logging plugin for qpsmtpd
@@ -138,14 +140,42 @@ is probably not high enough for most sites.
 =item B<prefix>
 
 In order to visually distinguish the accepted from rejected lines, all
-log lines from a rejected message will be prefixed with the character
+log lines from a accepted message will be prefixed with the character
 listed here (directly after the PID).  You can use anything you want as
 a prefix, but it is recommended that it be short (preferably just a single
 character) to minimize the amount of bloat in the log file.  If absent, the
-prefix defaults to the exclamation point (!).
+prefix defaults to the left single quote (`).
 
 =back
 
+=head1 TYPICAL USAGE
+
+If you are using multilog to handle your logging, you can replace the system
+provided log/run file with something like this:
+
+  #! /bin/sh
+  export LOGDIR=./main
+  mkdir -p $LOGDIR/failed
+  exec multilog t n10 \
+         '-*` *' $LOGDIR/detailed \
+    '-*' '+*` *' $LOGDIR/accepted
+
+which will have the following effects:
+
+=over 4
+
+=item 1. All lines will be logged into the ./mail/detailed folder
+
+=item 2. Log lines for messages that are accepted will go to ./main/accepted
+
+=back
+
+You may want to use the s####### option to multilog to ensure that the log
+files are large enough to maintain a proper amount of history.  Depending on
+your site load, it is useful to have at least a week and preferrably three
+weeks of accepted messages.  You can also use the n## option to have more
+log history files maintained.
+
 =head1 AUTHOR
 
 John Peacock <jpeacock@cpan.org>