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package vc; |
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|
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use Convert::Scalar 'weaken'; |
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|
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use Coro; |
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use Coro::Event; |
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use Coro::Channel; |
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|
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BEGIN { *slog = \&::slog } |
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|
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use constant MAXMSG => 1024; |
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use constant MAXQ => 10; |
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|
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use constant PROTVERSION => 1; |
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|
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my @send; |
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my $send_full = new Coro::Signal; |
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my $send_empty = new Coro::Signal; |
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|
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my @port; |
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my $port; |
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|
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sub dumpstr { |
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local $_ = $_[0]; |
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s/([^\x20-\x7f\xa0-\xff])/sprintf "\\x{%02x}", ord $1/ge; |
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$_ = "\"$_\""; |
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(substr $_, 60) = "\"..." if length($_) > 60; |
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$_; |
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} |
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|
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# catch (accept) an existing vc |
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sub catch { |
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my $class = shift; |
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my $self = bless { |
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rcv => (new Coro::Channel 1e9), |
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@_, |
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}, $class; |
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|
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weaken ($port[$self->{port}] = $self); |
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$self; |
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} |
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|
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# create (connect) a new vc |
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sub create { |
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my $class = shift; |
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my $self = $class->catch(port => ($port += 2), @_); |
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|
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$self; |
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} |
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|
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sub DESTROY { |
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&close; |
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} |
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|
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sub close { |
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my $self = shift; |
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|
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if ($self->{port}) { |
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slog 0, "closing port $self->{port}\n";#d# |
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push @{$send[0]}, pack "nn", $self->{port}, 65535; |
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$send_full->send; |
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delete $self->{port}; |
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} |
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} |
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|
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sub pri { |
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my $self = shift; |
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$self->{pri} = $_[0]; |
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} |
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|
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sub _snd { |
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my $self = shift; |
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|
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slog 8, ">>> :$self->{port} ".dumpstr($_[0])."\n"; #d# |
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push @{$send[$self->{pri}]}, |
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pack "nna*", $self->{port}, length $_[0], $_[0]; |
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|
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} |
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|
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sub _rcv { |
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$_[0]{port} ? $_[0]{rcv}->get : undef; |
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} |
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|
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sub snd { |
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my $self = shift; |
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my ($length, $ofs); |
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|
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$send_empty->wait while @send > MAXQ; |
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for (@_) { |
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if (length && MAXMSG >= length) { |
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$self->_snd($_); |
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} else { |
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$self->_snd(""); |
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for (my $ofs = 0; $ofs < length; $ofs += MAXMSG) { |
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$send_empty->wait while @send > MAXQ; |
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$self->_snd(substr $_, $ofs, MAXMSG); |
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} |
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$self->_snd(""); |
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} |
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} |
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$send_full->send; |
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} |
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|
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sub rcv { |
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my $self = shift; |
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my $data = $self->_rcv; |
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|
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unless (length $data) { |
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my $blk; |
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$data .= $blk while length ($blk = $self->_rcv); |
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} |
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|
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$data; |
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} |
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|
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sub feed { |
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$_[0]{rcv}->put($_[1]); |
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} |
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|
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sub snd_quit { |
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push @{$send[0]}, undef; $send_full->send; |
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} |
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|
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sub multiplex { |
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my ($fh, $slave) = @_; |
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|
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$port = $slave ? 1 : 0; |
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|
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$fh->timeout($::TIMEOUT); |
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|
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# periodically send nop as keepalive signal to avoid the |
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# rsync-on-slow-disk-timeout problem. |
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my $nopper = Event->timer(parked => 1, cb => sub { |
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push @{$send[0]}, pack "nn", 0, 1; $send_full->send; |
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}); |
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|
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my $ident = "\@SYNCMAIL VERSION $VERSION PROTOCOL ".PROTVERSION."\n"; |
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|
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# the feeder |
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async { |
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my $id = "a"; |
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$fh->print(pack "na*", length $ident, $ident); |
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command: |
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while() { |
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for (@send) { |
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if (@$_) { |
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my $vc = shift @$_; |
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if (defined $vc) { |
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$fh->print($vc); |
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} else { |
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last command; |
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} |
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$nopper->at(time+$::IDLE); $nopper->start; |
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next command; |
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} |
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} |
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$send_empty->send; |
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$send_full->wait; |
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} |
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$fh->print(pack "nn", 0, 0); |
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}; |
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|
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async { |
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eval { |
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my ($port, $len, $data); |
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|
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$fh->read($len, 2) == 2 |
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or die "unexpected eof: $!"; |
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$fh->read($data, unpack "n", $len) |
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or die "unexpected eof: $!"; |
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|
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$data eq $ident |
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or die "garbled input or version mismatch: $_"; |
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|
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while ($fh->read($port, 4) == 4) { |
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my ($port, $len) = unpack "nn", $port; |
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|
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if ($port) { |
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if ($len > 65000) { |
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slog 8, "||| :$port closing\n";#d# |
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if ($port[$port]) { |
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delete $port[$port]{port}; |
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$port[$port]->feed(undef); |
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undef $port[$port]; |
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} |
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} else { |
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$fh->sysread($data, $len) == $len |
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or die "unexpected read error: $!"; |
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|
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slog 8, "<<< :$port ".dumpstr($data)."\n"; #d# |
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|
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unless ($port[$port]) { |
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async \&::serve, catch vc port => $port; |
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} |
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|
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$port[$port]->feed($data); |
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} |
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} else { |
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slog 8, "<<< :$port <$len>\n"; |
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|
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if ($len == 0) { |
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snd_quit; |
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last; |
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} elsif ($len == 1) { |
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# nop |
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} else { |
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die "illegal control code received"; |
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} |
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} |
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} |
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}; |
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|
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slog 0, "ERROR: $@" if $@; |
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slog 9, "unlooping\n";#d# |
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unloop; |
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}; |
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|
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loop; |
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} |
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|
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1; |
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|
