do some ring printing if carp et al are called

[spider.git] / perl / DXDebug.pm

diff --git a/perl/DXDebug.pm b/perl/DXDebug.pm
index 08703d7c8230e49b780d71821d60cbd65719a1d4..634bf97211bda5e8d70cb48621e69059342dffda 100644 (file)
--- a/perl/DXDebug.pm
+++ b/perl/DXDebug.pm
@@ -8,6 +8,19 @@
 #       To allow debugging of a category (e.g. 'chan') but not onto disc (just into the ring buffer)
 #       do: set/debug chan nologchan
 #
+#       To print the current contents into the debug log: show/debug_ring
+#
+#       On exit or serious error the ring buffer is printed to the current debug log
+#
+# In Progress:
+#       Expose a localhost listener on port (default) 27755 to things like watchdbg so that they can carry on
+#       as normal, possibly with a "remember" button to permanently capture stuff observed.
+#
+# Future:
+#       This is likely to be some form of triggering or filtering controlling (some portion
+#       of) ring_buffer dumping.
+#
+#
 
 package DXDebug;
 
@@ -39,27 +52,29 @@ if (!defined $DB::VERSION) {
        local $^W=0;
        eval qq( sub confess { 
            \$SIG{__DIE__} = 'DEFAULT'; 
-        DXDebug::dbgprintring() unless DXDebug::isdbg('chan');
-        DXDebug::dbgclearring();
+        DXDebug::dbgprintring() if DXDebug('nologchan');
         DXDebug::dbg(\$@);
                DXDebug::dbg(Carp::shortmess(\@_));
            exit(-1); 
        }
        sub croak { 
                \$SIG{__DIE__} = 'DEFAULT'; 
-        DXDebug::dbgprintring() unless DXDebug::isdbg('chan');
-        DXDebug::dbgclearring();
+        DXDebug::dbgprintring() if DXDebug('nologchan');
         DXDebug::dbg(\$@);
                DXDebug::dbg(Carp::longmess(\@_));
                exit(-1); 
        }
-       sub carp    { DXDebug::dbg(Carp::shortmess(\@_)); }
-       sub cluck   { DXDebug::dbg(Carp::longmess(\@_)); } 
-       );
+       sub carp { 
+        DXDebug::dbgprintring(25) if DXDebug('nologchan');
+        DXDebug::dbg(Carp::shortmess(\@_)); 
+    }
+       sub cluck { 
+        DXDebug::dbgprintring(25) if DXDebug('nologchan');
+        DXDebug::dbg(Carp::longmess(\@_)); 
+    } );
 
     CORE::die(Carp::shortmess($@)) if $@;
-}
-else {
+} else {
     eval qq( sub confess { die Carp::longmess(\@_); }; 
                         sub croak { die Carp::shortmess(\@_); }; 
                         sub cluck { warn Carp::longmess(\@_); }; 
@@ -202,8 +217,10 @@ sub longmess
 sub dbgprintring
 {
        return unless $fp;
+       my $count = shift || $dbgringlth+1;
        my $first;
-       while (my $l = shift @dbgring) {
+       my $l;
+       for ( ; $count > 0 && ($l = shift @dbgring); --$count) {
                my ($t, $str) = split /\^/, $l, 2;
                next unless $t;
                my $lt = time;