finally working async framework

1 files changed, 222 insertions, 0 deletions

diff --git a/fs_selfservice/FS-SelfService/freeside-selfservice-clientd b/fs_selfservice/FS-SelfService/freeside-selfservice-clientd
new file mode 100644
index 000000000..149f894e0
--- /dev/null
+++ b/fs_selfservice/FS-SelfService/freeside-selfservice-clientd
@@ -0,0 +1,222 @@
+#!/usr/bin/perl -w
+#
+# freeside-selfservice-clientd
+#
+# This is run REMOTELY over ssh by freeside-selfservice-server
+
+use strict;
+use subs qw(spawn logmsg);
+use Fcntl qw(:flock);
+use Socket;
+use Storable qw(nstore_fd fd_retrieve);
+use IO::Handle;
+use IO::Select;
+use IPC::Open2;
+
+use LockFile::Simple qw(lock unlock);
+
+use vars qw( $Debug );
+$Debug = 2;
+
+my $socket = "/usr/local/freeside/selfservice_socket";
+my $pid_file = "$socket.pid";
+my $lock_file = "$socket.lock";
+unlink $lock_file;
+
+my $me = '[client]';
+
+$|=1;
+
+#read data to be cached or something
+#warn "$me Reading init data\n" if $Debug;
+#my $signup_init = 
+
+warn "[client] Creating $socket\n" if $Debug;
+my $uaddr = sockaddr_un($socket);
+my $proto = getprotobyname('tcp');
+socket(Server,PF_UNIX,SOCK_STREAM,0) or die "socket: $!";
+unlink($socket);
+bind(Server, $uaddr) or die "bind: $!";
+listen(Server,SOMAXCONN) or die "listen: $!";
+
+if ( -e $pid_file ) {
+  open(PIDFILE,"<$pid_file");
+  #chomp( my $old_pid = <PIDFILE> );
+  my $old_pid = <PIDFILE>;
+  close PIDFILE;
+  $old_pid =~ /^(\d+)$/;
+  kill 'TERM', $1;
+}
+open(PIDFILE,">$pid_file");
+print PIDFILE "$$\n";
+close PIDFILE;
+
+#my $waitedpid;
+#sub REAPER { $waitedpid = wait; $SIG{CHLD} = \&REAPER; }
+#$SIG{CHLD} =  \&REAPER;
+
+warn "[client] entering main loop\n" if $Debug;
+
+#sub spawn;
+#sub logmsg;
+
+my %kids;
+
+  #    my $gar = <STDIN>;
+
+#my $s = new IO::Select;
+#$s->add(\*STDIN);
+#$s->add(\*Server);
+
+#for ( $waitedpid = 0;
+#      accept(Client,Server) || $waitedpid;
+#      $waitedpid = 0, close Client)
+#{
+#  next if $waitedpid;
+
+#$SIG{PIPE} = sub { warn "SIGPIPE received" };
+#$SIG{CHLD} = sub { warn "SIGCHLD received" };
+
+sub REAPER { warn "SIGCHLD received"; my $pid = wait; $SIG{CHLD} = \&REAPER; }
+#sub REAPER { my $pid = wait; delete $kids{$pid}; $SIG{CHLD} = \&REAPER; }
+$SIG{CHLD} =  \&REAPER;
+
+warn "[client] creating IO::Select\n" if $Debug;
+my $s = new IO::Select;
+$s->add(\*STDIN);
+$s->add(\*Server);
+
+while (1) {
+
+warn "[client] waiting for connection or token\n" if $Debug;
+while ( my @handles = $s->can_read ) {
+
+  foreach my $handle ( @handles ) {
+
+    if ( $handle == \*STDIN ) {
+
+#      my $gar = <STDIN>;
+#      die $gar;
+
+      my $packet = fd_retrieve(\*STDIN);
+      my $token = $packet->{'_token'};
+      warn "[client] received packet with token $token\n".
+           join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
+        if $Debug;
+     if ( exists($kids{$token}) ) {
+        warn "[client] sending return packet to $token via $kids{$token}\n"
+          if $Debug;
+        nstore_fd($packet, $kids{$token});
+        warn "[client] flushing $kids{$token}\n" if $Debug;
+        $kids{$token}->flush;
+        #eval { $kids{$token}->flush; };
+        #die "error flushing?!?!? $@\n" if $@ ne '';
+        #warn "[client] closing $kids{$token}\n";
+        #close $kids{$token};
+        #warn "[client] deleting $kids{$token}\n";
+        #delete $kids{$token};
+        warn "[client] done with $token\n" if $Debug;
+      } else {
+        warn "[client] WARNING: unknown token $token, discarding message";
+        #die "[client] FATAL: unknown token $token, discarding message";
+      }
+
+    } elsif ( $handle == \*Server ) {
+
+      warn "[client] received local connection; forking\n" if $Debug;
+
+      accept(Client, Server);
+
+      spawn sub { #child
+        warn "[client-$$] reading packet from local client" if $Debug > 1;
+        my $packet = fd_retrieve(\*Client);
+        warn "[client-$$] packet received:\n".
+             join('', map { " $_=>$packet->{$_}\n" } keys %$packet )
+          if $Debug > 1;
+        my $command = $packet->{'command'};
+        #handle some commands weirdly?
+        $packet->{_token}=$$; #??
+
+        warn "[client-$$] sending packet to remote server" if $Debug > 1;
+        flock(STDOUT, LOCK_EX); #acquire write lock
+        #lock($lock_file);
+        nstore_fd($packet, \*STDOUT);
+        STDOUT->flush;
+        #unlock($lock_file);
+        flock(STDOUT, LOCK_UN); #release write lock
+
+        warn "[client-$$] waiting for response from parent" if $Debug > 1;
+
+        #block until parent has a message
+        my $w = new IO::Select;
+        $w->add(\*STDIN);
+        my @wait = $w->can_read;
+        my $rv = fd_retrieve(\*STDIN);
+
+        #close STDIN;
+
+        warn "[client-$$] sending response to local client" if $Debug > 1;
+
+        #send message to local client
+        nstore_fd($rv, \*Client);
+        Client->flush;
+
+        close Client;
+
+        warn "[client-$$] child exiting" if $Debug > 1;
+
+        #while (1) { sleep 5 };
+        #sleep 5;
+        exit;
+
+      }; #eo child
+
+      #close Client; #in parent, right?
+
+    } else {
+      die "wtf?  $handle";
+    }
+
+  }
+
+  warn "[client] done handling messages; returning to wait-state" if $Debug;;
+
+}
+
+#die "[client] died unexpectedly: $!\n";
+warn "[client] fell-through unexpectedly: $!\n" if $Debug;
+
+} #WTF?
+
+sub spawn {
+    my $coderef = shift;
+
+    unless (@_ == 0 && $coderef && ref($coderef) eq 'CODE') {
+        use Carp;
+        confess "usage: spawn CODEREF";
+    }
+
+    my $pid;
+    #if (!defined($pid = fork)) {
+    my $kid = new IO::Handle;
+    if (!defined($pid = open($kid, '|-'))) {
+        logmsg "WARNING: cannot fork: $!";
+        return;
+    } elsif ($pid) {
+        logmsg "begat $pid" if $Debug;
+        $kids{$pid} = $kid;
+        #$kids{$pid}->autoflush;
+        return; # I'm the parent
+    }
+    # else I'm the child -- go spawn
+
+#    open(STDIN,  "<&Client")   || die "can't dup client to stdin";
+#    open(STDOUT, ">&Client")   || die "can't dup client to stdout";
+    ## open(STDERR, ">&STDOUT") || die "can't dup stdout to stderr";
+    exit &$coderef();
+}
+
+#sub logmsg { print "$0 $$: @_ at ", scalar localtime, "\n" }
+#DON'T PRINT!!!!!
+sub logmsg { warn "[client] $0 $$: @_ at ", scalar localtime, "\n" }
+