default to a session cookie instead of setting an explicit timeout, weird timezone...

[freeside.git] / FS / FS / Daemon.pm

diff --git a/FS/FS/Daemon.pm b/FS/FS/Daemon.pm
index 7e0d45c..a3c16d8 100644 (file)
--- a/FS/FS/Daemon.pm
+++ b/FS/FS/Daemon.pm
@@ -1,25 +1,45 @@
 package FS::Daemon;
 
 use vars qw( @ISA @EXPORT_OK );
-use vars qw( $pid_dir $me $pid_file $sigint $sigterm $logfile );
+use vars qw( $pid_dir $me $pid_file $sigint $sigterm $NOSIG $logfile );
 use Exporter;
 use Fcntl qw(:flock);
 use POSIX qw(setsid);
 use IO::File;
+use File::Basename;
+use File::Slurp qw(slurp);
 use Date::Format;
+use FS::UID qw( forksuidsetup );
 
 #this is a simple refactoring of the stuff from freeside-queued, just to
 #avoid duplicate code.  eventually this should use something from CPAN.
 
 @ISA = qw(Exporter);
-@EXPORT_OK = qw( daemonize1 drop_root daemonize2 sigint sigterm logfile );
+@EXPORT_OK = qw(
+  daemonize1 drop_root daemonize2 myexit logfile sigint sigterm
+  daemon_fork daemon_wait daemon_reconnect
+);
+%EXPORT_TAGS = ( 'all' => [ @EXPORT_OK ] );
 
 $pid_dir = '/var/run';
 
+$NOSIG = 0;
+$PID_NEWSTYLE = 0;
+
+our $MAX_KIDS = 10; # for daemon_fork
+our $kids = 0;
+our %kids;
+
 sub daemonize1 {
   $me = shift;
 
-  $pid_file = "$pid_dir/$me";
+  $pid_file = $pid_dir;
+  if ( $PID_NEWSTYLE ) {
+    $pid_file .= '/freeside';
+    mkdir $pid_file unless -d $pid_file;
+    chown $FS::UID::freeside_uid, -1, $pid_file;
+  }
+  $pid_file .= "/$me";
   $pid_file .= '.'.shift if scalar(@_);
   $pid_file .= '.pid';
 
@@ -30,6 +50,7 @@ sub daemonize1 {
     print "$me started with pid $pid\n"; #logging to $log_file\n";
     exit unless $pid_file;
     my $pidfh = new IO::File ">$pid_file" or exit;
+    chown $FS::UID::freeside_uid, -1, $pid_file;
     print $pidfh "$pid\n";
     exit;
   }
@@ -38,8 +59,11 @@ sub daemonize1 {
   #$SIG{CHLD} =  \&REAPER;
   $sigterm = 0;
   $sigint = 0;
-  $SIG{INT}  = sub { warn "SIGINT received; shutting down\n"; $sigint++;  };
-  $SIG{TERM} = sub { warn "SIGTERM received; shutting down\n"; $sigterm++; };
+  unless ( $NOSIG ) {
+    $SIG{INT}  = sub { warn "SIGINT received; shutting down\n"; $sigint++;  };
+    $SIG{TERM} = sub { warn "SIGTERM received; shutting down\n"; $sigterm++; };
+  }
+
 }
 
 sub drop_root {
@@ -74,14 +98,30 @@ sub sigterm { $sigterm; }
 
 sub logfile { $logfile = shift; } #_logmsg('test'); }
 
+sub myexit {
+  chomp( my $pid = slurp($pid_file) );
+  unlink $pid_file if -e $pid_file && $$ == $pid;
+  exit;  
+}
+
 sub _die {
+  die @_ if $^S; # $^S = 1 during an eval(), don't break exception handling
   my $msg = shift;
-  unlink $pid_file if -e $pid_file;
+
+  chomp( my $pid = slurp($pid_file) );
+  unlink $pid_file if -e $pid_file && $$ == $pid;
+
   _logmsg($msg);
 }
 
 sub _logmsg {
   chomp( my $msg = shift );
+  # set the logfile sensibly
+  if (!$logfile) {
+    my $logname = $me;
+    $logname =~ s/^freeside-//;
+    logfile("%%%FREESIDE_LOG%%%/$logname-log.$FS::UID::datasrc");
+  }
   my $log = new IO::File ">>$logfile";
   flock($log, LOCK_EX);
   seek($log, 0, 2);
@@ -90,3 +130,90 @@ sub _logmsg {
   close $log;
 }
 
+=item daemon_fork CODEREF[, ARGS ]
+
+Executes CODEREF in a child process, with its own $FS::UID::dbh handle.  If
+the number of child processes is >= $FS::Daemon::MAX_KIDS then this will
+block until some of the child processes are finished. ARGS will be passed
+to the coderef.
+
+If the fork fails, this will throw an exception containing $!. Otherwise
+it returns the PID of the child, like fork() does.
+
+=cut
+
+sub daemon_fork {
+  $FS::UID::dbh->{AutoInactiveDestroy} = 1;
+  # wait until there's a lane open
+  daemon_wait($MAX_KIDS - 1);
+
+  my ($code, @args) = @_;
+
+  my $user = $FS::CurrentUser::CurrentUser->username;
+
+  my $pid = fork;
+  if (!defined($pid)) {
+
+    warn "WARNING: can't fork: $!\n";
+    die "$!\n";
+
+  } elsif ( $pid > 0 ) {
+
+    $kids{ $pid } = 1;
+    $kids++;
+    return $pid;
+
+  } else { # kid
+    forksuidsetup( $user );
+    &{$code}(@args);
+    exit;
+
+  }
+}
+
+=item daemon_wait [ MAX ]
+
+Waits until there are at most MAX daemon_fork() child processes running,
+reaps the ones that are finished, and continues. MAX defaults to zero, i.e.
+wait for everything to finish.
+
+=cut
+
+sub daemon_wait {
+  my $max = shift || 0;
+  while ($kids > $max) {
+    foreach my $pid (keys %kids) {
+      my $kid = waitpid($pid, WNOHANG);
+      if ( $kid > 0 ) {
+        $kids--;
+        delete $kids{$kid};
+      }
+    }
+    sleep(1);
+  }
+}
+
+=item daemon_reconnect
+
+Checks whether the database connection is live, and reconnects if not.
+
+=cut
+
+sub daemon_reconnect {
+  my $dbh = $FS::UID::dbh;
+  unless ($dbh && $dbh->ping) {
+    warn "WARNING: connection to database lost, reconnecting...\n";
+
+    eval { $FS::UID::dbh = myconnect(); };
+
+    unless ( !$@ && $FS::UID::dbh && $FS::UID::dbh->ping ) {
+      warn "WARNING: still no connection to database, sleeping for retry...\n";
+      sleep 10;
+      next;
+    } else {
+      warn "WARNING: reconnected to database\n";
+    }
+  }
+}
+
+1;