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#!/usr/bin/perl |
| 2 |
|
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use Coro; |
| 4 |
use Coro::Handle; |
| 5 |
use Coro::Event; |
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use Coro::Semaphore; |
| 7 |
use Coro::Channel; |
| 8 |
use Coro::Signal; |
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|
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use MD5; |
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|
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use constant VERSION => 1; |
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|
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# TODO: content-length support (HACK!) |
| 15 |
# TODO: real message-id parsing |
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|
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$|=1; |
| 18 |
|
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$v = 9; |
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|
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$SLAVE = 1*($ARGV[0] eq "--slave"); |
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|
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my $ecnt; |
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|
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sub slog { |
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if ($_[0] <= $v) { |
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print STDERR $_[1]; |
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} |
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} |
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|
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# parse_folder(mbox-file-path, callback) |
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# callback gets called with \$header and \$body, |
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# $header includes the mbox From_ line without |
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# the leading From_ itself. |
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sub parse_folder { |
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my ($path, $cb) = @_; |
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|
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open my $fh, "<", $path |
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or die "$path: $!"; |
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|
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local $/ = "\n\n"; |
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|
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my ($head, $body, $offs); |
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|
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5 == read $fh, $head, 5 |
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or return; |
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|
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$head eq "From " |
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or return; |
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|
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$offs = 0; |
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while (defined ($head = <$fh>)) { |
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$head =~ /^.*? [A-Z][a-z][a-z] [A-Z][a-z][a-z] [ 0-9][0-9] \d\d:\d\d:\d\d(?: [+-]\d\d\d\d)? \d\d(?:\d\d)\n/ |
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or die "$path: not standard mbox format header:\n$head\n"; |
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|
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local $/ = "\nFrom "; |
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# NEVER enable this. content-length simply is broken by design |
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#if ($head =~ /^Content-Length:\s+(\d+)$/im) { |
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# $1 <= read $fh, $body, $1 + 5 |
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# or die "$path: partial message in mbox"; |
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#} else { |
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$body = <$fh>; |
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#} |
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chomp $body; |
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$cb->($offs, \$head, \$body); |
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$offs = (tell $fh) - 5; |
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cede unless ++$ecnt & 1023; |
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} |
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|
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1; |
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} |
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|
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sub read_mdif { |
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my ($path) = @_; |
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my $fh; |
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my $mdif; |
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open my $fh, "<", $path |
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or return { }; |
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|
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defined ($_ = <$fh>) |
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or die "$path: empty mdif file\n"; |
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|
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do { |
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if ($_ eq "[SYNCMAIL]\n") { |
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while (<$fh>) { |
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last unless /^([a-z]+)\s*=\s*(.*)\n$/; |
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$mdif->{$1} = $2; |
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} |
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} elsif ($_ eq "[HOSTS]\n") { |
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while (<$fh>) { |
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last unless /^([^[].*)=(.*)\n$/; |
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$mdif->{host}{$1} = $2; |
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} |
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} elsif (/^\[DIFF(\d+)\.(\d+)\]\n$/) { |
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my ($gen, $mtime) = ($1, $2); |
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my @dif; |
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while (<$fh>) { |
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last unless /^[+-]/; |
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push @dif, substr $_, 0, -1; |
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} |
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unshift @{$mdif->{diff}}, [$gen, $mtime, \@dif]; |
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} elsif ($_ eq "[INDEX]\n") { |
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my @idx; |
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while (<$fh>) { |
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last unless /^(\d+)=(.*)\n$/; |
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push @idx, [$1, $2]; |
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} |
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$mdif->{idx} = \@idx; |
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} elsif (/^#/) { |
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$_ = <$fh>; |
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# nop |
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} else { |
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die "$path: unparseable section '$_'\n"; |
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} |
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} while defined $_; |
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|
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$mdif->{version} <= VERSION |
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or die "$path: version mismatch ($mdif->{version} found, <".VERSION." expected)\n"; |
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|
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$mdif; |
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} |
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|
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sub write_mdif { |
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my ($path, $mdif) = @_; |
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my $fh; |
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|
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open my $fh, ">", "$path~" |
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or die "$path~: $!"; |
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|
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print $fh "# automatically generated, do NOT edit\n"; |
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|
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print $fh "[SYNCMAIL]\n"; |
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print $fh "$_=$mdif->{$_}\n" for (qw(fsize mtime gen version)); |
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|
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print $fh "[HOSTS]\n"; |
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print $fh "$k=$v\n" while my ($k,$v) = each %{$mdif->{host}}; |
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|
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print $fh "[INDEX]\n"; |
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print $fh "$_->[0]=$_->[1]\n" for @{$mdif->{idx}}; |
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|
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for (reverse @{$mdif->{diff}}) { |
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print $fh "[DIFF$_->[0].$_->[1]]\n"; |
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print $fh $_, "\n" for @{$_->[2]}; |
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} |
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|
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close $fh |
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or die "$path~: unable to create updated .mdif: $!"; |
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|
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rename "$path~", $path; |
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} |
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|
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sub gendiff { |
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my ($d1, $d2) = @_; |
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|
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my @d; |
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my (%d1, %d2); |
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|
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for (@$d2) { |
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undef $d2{$_->[1]}; |
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} |
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|
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# delete msgs in d1 but not in d2 |
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for (@$d1) { |
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undef $d1{$_->[1]}; |
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push @d, "-$_->[1]" unless exists $d2{$_->[1]}; |
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} |
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%d2 = (); # conserve memory |
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|
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# add msgs in d2 but not in d1 |
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for (@$d2) { |
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push @d, "+$_->[1]" unless exists $d1{$_->[1]}; |
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} |
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|
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\@d; |
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} |
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|
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my $check_folder = new Coro::Semaphore; |
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|
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sub check_folder { |
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my ($path) = @_; |
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my $guard = $check_folder->guard; |
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|
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(my $conf = $path) =~ s%([^/]+$)%.$1.mdif%; |
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|
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slog 1, "checking $path\n"; |
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|
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if (stat $path) { |
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my ($fsize, $mtime) = (stat _)[7, 9]; |
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if (open my $fh, "<", $conf) { |
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my %conf; |
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<$fh>; # skip initial comment |
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<$fh> eq "[SYNCMAIL]\n" |
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or die "$conf: format error"; |
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while (<$fh> =~ /^([a-z]+)\s*=\s*(.*)$/) { |
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$conf{$1} = $2; |
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} |
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return (1, \%conf) if $fsize == $conf{fsize} |
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&& $mtime == $conf{mtime}; |
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} |
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|
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slog 2, "updating $path\n"; |
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|
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my @idx; |
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|
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parse_folder $path, sub { |
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my ($offs, $head, $body) = @_; |
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my $mid; |
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if ($$head =~ /^Message-Id:\s*(<[^<\n]+>)\s*\n/im) { |
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$mid = $1; |
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} else { |
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$mid = MD5->hexhash("$$head\0$$body"); |
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} |
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push @idx, [$offs, $mid]; |
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} or return (); |
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|
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my $mdif = read_mdif $conf; |
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|
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if ($mdif->{version}) { |
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my $d = gendiff $mdif->{idx}, \@idx; |
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push @{$mdif->{diff}}, [ |
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$mdif->{gen}++, |
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$mdif->{mtime}, |
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$d, |
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] if @$d; |
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} else { |
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slog 2, "$path: new folder\n"; |
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$mdif->{version} ||= VERSION; |
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$mdif->{gen} = 1; |
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} |
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|
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$mdif->{fsize} = $fsize; |
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$mdif->{mtime} = $mtime; |
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$mdif->{idx} = \@idx; |
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|
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write_mdif $conf, $mdif; |
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|
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return (2, $mdif); |
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} else { |
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slog 2, "$path: no longer exists\n"; |
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unlink $conf; |
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|
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return (); |
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} |
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} |
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|
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my $send = new Coro::Channel 10; |
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my $done = 0; |
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|
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# request $command, $data |
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sub request { |
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my $res; |
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my $signal = new Coro::Signal; |
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my $cmd = defined $_[1] ? "000+".length($_[1])." $_[0]\n$_[1]" : "000 $_[0]\n"; |
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$send->put([$signal, \$res, $cmd]); |
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$signal->wait; |
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$res; |
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} |
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|
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# reply $id, $code, $msg, $data |
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sub reply { |
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my $cmd = defined $_[3] ? "$_[1]+".length($_[3])." $_[2]\n$_[3]" : "$_[1] $_[2]\n"; |
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$send->put([undef, undef, "$_[0] $cmd"]); |
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} |
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|
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sub handle_commands { |
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my ($fh) = @_; |
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my $id = "a"; |
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async { |
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$fh->print("- 000 hello $HOSTID\n"); |
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while (my $r = $send->get) { |
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if (defined $r->[1]) { |
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my $id = ++$id; |
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$request{$id} = $r; |
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print STDERR "<<< $SLAVE sendign request $id:$r->[2]";#d# |
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$fh->print("$id $r->[2]"); |
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} else { |
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print STDERR "<<< $SLAVE sendign reply $r->[2]";#d# |
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$fh->print($r->[2]); |
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} |
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} |
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print STDERR "$SLAVE shutdown\n";#d# |
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shutdown $fh, 1; |
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}; |
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while (<$fh>) { |
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slog 0, ">>> $SLAVE received :$_"; |
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/^(\S+) (\d\d\d)(?:\+(\d+))?\s*(.*)$/ |
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or die "protocol error, garbled command ($_)"; |
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|
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my ($id, $code, $dlen, $msg) = ($1, $2, $3, $4); |
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my $data; |
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|
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$fh->sysread($data, $dlen) == $dlen |
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or die "unexpected read error: $!"; |
| 294 |
|
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if ($code == 0) { |
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if ($msg eq "quit") { |
| 297 |
print $fh "$id 200 quit\n"; |
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$send->put(undef); |
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last; |
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} elsif ($msg eq "nop") { |
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reply $id, 200, "nop"; |
| 302 |
} elsif ($msg =~ /^hello (.*)$/) { |
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$OTHERID = $1; |
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slog 3, "otherid set to $OTHERID\n"; |
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} else { |
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die "protocol error, unknown command ($_)\n"; |
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} |
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} else { |
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my $r = delete $request{$id} |
| 310 |
or die "protocol error, invalid reply id ($_)\n"; |
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|
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${$r->[1]} = [$code, $msg, $data]; |
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$r->[0]->send; |
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} |
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|
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if ($done && !%request) { |
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$done = 0; |
| 318 |
async { |
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request("quit"); |
| 320 |
exit 0; |
| 321 |
}; |
| 322 |
} |
| 323 |
} |
| 324 |
|
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exit 0; |
| 326 |
} |
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|
| 328 |
sub sync_dir { |
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my ($path) = @_; |
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|
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opendir my $dh, $path |
| 332 |
or die "$path: $!"; |
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|
| 334 |
while (defined (my $folder = readdir $dh)) { |
| 335 |
next if $folder =~ /^\./; |
| 336 |
my $path = "$path/$folder"; |
| 337 |
next unless -f $path; |
| 338 |
my ($status, $mdif) = check_folder $path; |
| 339 |
print STDERR "$path: $status | $mdif\n";#d# |
| 340 |
if ($SLAVE) { |
| 341 |
request "fhave", $folder; |
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} else { |
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request "fwant", $folder; |
| 344 |
} |
| 345 |
} |
| 346 |
|
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$done = 1; |
| 348 |
my $x = request("nop"); |
| 349 |
print STDERR "$SLAVE returned nop @$x\n";#d# |
| 350 |
} |
| 351 |
|
| 352 |
if ($SLAVE) { |
| 353 |
$HOSTID = "slave"; |
| 354 |
async \&sync_dir, "./dst"; |
| 355 |
handle_commands unblock \*STDIN; |
| 356 |
} else { |
| 357 |
$HOSTID = "master"; |
| 358 |
{ |
| 359 |
use Socket; |
| 360 |
socketpair S1, S2, AF_UNIX, SOCK_STREAM, PF_UNSPEC; |
| 361 |
if (fork == 0) { |
| 362 |
open STDIN, "<&S2" or die; |
| 363 |
open STDOUT, ">&S2" or die; |
| 364 |
exec $0, "--slave"; |
| 365 |
exit 255; |
| 366 |
} |
| 367 |
async \&sync_dir, "./src"; |
| 368 |
handle_commands unblock \*S1; |
| 369 |
} |
| 370 |
} |
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|
