AnyEvent-Fork-RPC/RPC/Async.pm

package AnyEvent::Fork::RPC::Async;

use common::sense; # actually required to avoid spurious warnings...

our $VERSION = 2; # protocol version

use Errno ();

use AnyEvent;

# declare only
sub AnyEvent::Fork::RPC::event;

sub do_exit { exit } # workaround for perl 5.14 and below

sub run {
   my %kv = splice @_, pop;

   my $rfh = shift;
   my $wfh = fileno $rfh ? $rfh : *STDOUT;

   my $function   = delete $kv{function};
   my $serialiser = delete $kv{serialiser};
   my $rlen       = delete $kv{rlen};
   my $done       = delete $kv{done};

   $0 =~ s/^(\d+).*$/$1 $function/s;

   {
      package main;
      my $init = delete $kv{init};
      &$init if length $init;
      $function = \&$function; # resolve function early for extra speed
   }

   my $busy = 1; # exit when == 0

   my ($f, $t) = eval $serialiser; AE::log fatal => $@ if $@;
   my ($wbuf, $ww);

   my $wcb = sub {
      my $len = syswrite $wfh, $wbuf;

      unless (defined $len) {
         if ($! != Errno::EAGAIN && $! != Errno::EWOULDBLOCK) {
            undef $ww;
            AE::log fatal => "AnyEvent::Fork::RPC: write error ($!), parent gone?";
         }
      }

      substr $wbuf, 0, $len, "";

      unless (length $wbuf) {
         undef $ww;
         unless ($busy) {
            shutdown $wfh, 1;
            @_ = (); goto &$done;
         }
      }
   };

   my $write = sub {
      $wbuf .= $_[0];
      $ww ||= AE::io $wfh, 1, $wcb;
   };

   *AnyEvent::Fork::RPC::event = sub {
      $write->(pack "NN/a*", 0, &$f);
   };

   my ($rbuf, $rw);

   my $len;

   $rw = AE::io $rfh, 0, sub {
      $rlen = $rlen * 2 + 16 if $rlen - 128 < length $rbuf;
      $len = sysread $rfh, $rbuf, $rlen - length $rbuf, length $rbuf;

      if ($len) {
         while (8 <= length $rbuf) {
            (my $id, $len) = unpack "NN", $rbuf;
            8 + $len <= length $rbuf
               or last;

            my @r = $t->(substr $rbuf, 8, $len);
            substr $rbuf, 0, 8 + $len, "";
            
            ++$busy;
            $function->(sub {
               --$busy;
               $write->(pack "NN/a*", $id, &$f);
            }, @r);
         }
      } elsif (defined $len or $! == Errno::EINVAL) { # EINVAL is for microshit windoze
         undef $rw;
         --$busy;
         $ww ||= AE::io $wfh, 1, $wcb;
      } elsif ($! != Errno::EAGAIN && $! != Errno::EWOULDBLOCK) {
         undef $rw;
         AE::log fatal => "AnyEvent::Fork::RPC: read error in child: $!";
      }
   };

   $AnyEvent::MODEL eq "AnyEvent::Impl::EV"
      ? EV::run ()
      : AE::cv->recv;
}

1

Revision:	1.16
Committed:	Thu Sep 12 15:15:49 2019 UTC (7 years ago) by root
Branch:	MAIN
Changes since 1.15:	+11 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	package AnyEvent::Fork::RPC::Async;
2
3			use common::sense; # actually required to avoid spurious warnings...
4
5	root	1.16	our $VERSION = 2; # protocol version
6
7	root	1.1	use Errno ();
8
9			use AnyEvent;
10
11			# declare only
12			sub AnyEvent::Fork::RPC::event;
13
14	root	1.9	sub do_exit { exit } # workaround for perl 5.14 and below
15
16	root	1.1	sub run {
17	root	1.16	my %kv = splice @_, pop;
18
19	root	1.4	my $rfh = shift;
20			my $wfh = fileno $rfh ? $rfh : *STDOUT;
21	root	1.1
22	root	1.16	my $function = delete $kv{function};
23			my $serialiser = delete $kv{serialiser};
24			my $rlen = delete $kv{rlen};
25			my $done = delete $kv{done};
26
27	root	1.15	$0 =~ s/^(\d+).*$/$1 $function/s;
28	root	1.5
29	root	1.1	{
30			package main;
31	root	1.16	my $init = delete $kv{init};
32	root	1.1	&$init if length $init;
33			$function = \&$function; # resolve function early for extra speed
34			}
35
36			my $busy = 1; # exit when == 0
37
38	root	1.8	my ($f, $t) = eval $serialiser; AE::log fatal => $@ if $@;
39	root	1.1	my ($wbuf, $ww);
40
41			my $wcb = sub {
42	root	1.4	my $len = syswrite $wfh, $wbuf;
43	root	1.1
44			unless (defined $len) {
45			if ($! != Errno::EAGAIN && $! != Errno::EWOULDBLOCK) {
46			undef $ww;
47	root	1.8	AE::log fatal => "AnyEvent::Fork::RPC: write error ($!), parent gone?";
48	root	1.1	}
49			}
50
51			substr $wbuf, 0, $len, "";
52
53			unless (length $wbuf) {
54			undef $ww;
55	root	1.3	unless ($busy) {
56	root	1.4	shutdown $wfh, 1;
57	root	1.6	@_ = (); goto &$done;
58	root	1.3	}
59	root	1.1	}
60			};
61
62			my $write = sub {
63			$wbuf .= $_[0];
64	root	1.4	$ww \|\|= AE::io $wfh, 1, $wcb;
65	root	1.1	};
66
67			*AnyEvent::Fork::RPC::event = sub {
68	root	1.4	$write->(pack "NN/a*", 0, &$f);
69	root	1.1	};
70
71	root	1.16	my ($rbuf, $rw);
72	root	1.1
73	root	1.2	my $len;
74	root	1.1
75	root	1.4	$rw = AE::io $rfh, 0, sub {
76	root	1.1	$rlen = $rlen * 2 + 16 if $rlen - 128 < length $rbuf;
77	root	1.4	$len = sysread $rfh, $rbuf, $rlen - length $rbuf, length $rbuf;
78	root	1.1
79			if ($len) {
80			while (8 <= length $rbuf) {
81	root	1.4	(my $id, $len) = unpack "NN", $rbuf;
82	root	1.1	8 + $len <= length $rbuf
83			or last;
84
85			my @r = $t->(substr $rbuf, 8, $len);
86			substr $rbuf, 0, 8 + $len, "";
87
88			++$busy;
89			$function->(sub {
90			--$busy;
91	root	1.4	$write->(pack "NN/a*", $id, &$f);
92	root	1.1	}, @r);
93			}
94	root	1.7	} elsif (defined $len or $! == Errno::EINVAL) { # EINVAL is for microshit windoze
95	root	1.1	undef $rw;
96			--$busy;
97	root	1.4	$ww \|\|= AE::io $wfh, 1, $wcb;
98	root	1.1	} elsif ($! != Errno::EAGAIN && $! != Errno::EWOULDBLOCK) {
99			undef $rw;
100	root	1.8	AE::log fatal => "AnyEvent::Fork::RPC: read error in child: $!";
101	root	1.1	}
102			};
103
104	root	1.14	$AnyEvent::MODEL eq "AnyEvent::Impl::EV"
105	root	1.10	? EV::run ()
106	root	1.1	: AE::cv->recv;
107			}
108
109			1
110