From 2b673b707edc91f505836e567b690d0acd1120ff Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Sat, 9 Apr 2016 00:28:07 +0000 Subject: import: initial module + test case This will allow us to write fast importers for existing archives as well as eventually removing the ssoma dependency for performance and ease-of-installation. --- lib/PublicInbox/Import.pm | 190 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 190 insertions(+) create mode 100644 lib/PublicInbox/Import.pm (limited to 'lib') diff --git a/lib/PublicInbox/Import.pm b/lib/PublicInbox/Import.pm new file mode 100644 index 00000000..e2156f10 --- /dev/null +++ b/lib/PublicInbox/Import.pm @@ -0,0 +1,190 @@ +# Copyright (C) 2016 all contributors +# License: AGPL-3.0+ +# +# git fast-import-based ssoma-mda MDA replacement +# This is only ever run by public-inbox-mda and public-inbox-learn, +# not the WWW or NNTP code which only requires read-only access. +package PublicInbox::Import; +use strict; +use warnings; +use Fcntl qw(:flock :DEFAULT); +use Email::Address; +use PublicInbox::Spawn qw(spawn); +use PublicInbox::MID qw(mid_mime mid2path); + +sub new { + my ($class, $git, $name, $email) = @_; + bless { + git => $git, + ident => "$name <$email>", + mark => 1, + ref => 'refs/heads/master', + }, $class +} + +# idempotent start function +sub gfi_start { + my ($self) = @_; + + return ($self->{in}, $self->{out}) if $self->{pid}; + + my ($in_r, $in_w, $out_r, $out_w); + pipe($in_r, $in_w) or die "pipe failed: $!"; + pipe($out_r, $out_w) or die "pipe failed: $!"; + my $git = $self->{git}; + my $git_dir = $git->{git_dir}; + my $lockpath = "$git_dir/ssoma.lock"; + sysopen(my $lockfh, $lockpath, O_WRONLY|O_CREAT) or + die "failed to open lock $lockpath: $!"; + + # wait for other processes to be done + flock($lockfh, LOCK_EX) or die "lock failed: $!\n"; + chomp($self->{tip} = $git->qx(qw(rev-parse --revs-only), $self->{ref})); + + my @cmd = ('git', "--git-dir=$git_dir", qw(fast-import + --quiet --done --date-format=rfc2822)); + my $rdr = { 0 => fileno($out_r), 1 => fileno($in_w) }; + my $pid = spawn(\@cmd, undef, $rdr); + die "spawn failed: $!" unless defined $pid; + $out_w->autoflush(1); + $self->{in} = $in_r; + $self->{out} = $out_w; + $self->{lockfh} = $lockfh; + $self->{pid} = $pid; + ($in_r, $out_w); +} + +sub wfail () { die "write to fast-import failed: $!" } + +sub now2822 () { + my @t = gmtime(time); + my $day = qw(Sun Mon Tue Wed Thu Fri Sat)[$t[6]]; + my $mon = qw(Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec)[$t[4]]; + + sprintf('%s, %2d %s %d %02d:%02d:%02d +0000', + $day, $t[3], $mon, $t[5] + 1900, $t[2], $t[1], $t[0]); +} + +# returns undef on non-existent +# (-1, msg) on mismatch +# (:MARK, msg) on success +sub remove { + my ($self, $mime) = @_; # mime = Email::MIME + + my $mid = mid_mime($mime); + my $path = mid2path($mid); + + my ($r, $w) = $self->gfi_start; + my $tip = $self->{tip}; + return if $tip eq ''; + + print $w "ls $tip $path\n" or wfail; + local $/ = "\n"; + my $check = <$r>; + defined $check or die "EOF from fast-import / ls: $!"; + return if $check =~ /\Amissing /; + $check =~ m!\A100644 blob ([a-f0-9]{40})\t!s or die "not blob: $check"; + my $blob = $1; + print $w "cat-blob $blob\n" or wfail; + $check = <$r>; + defined $check or die "EOF from fast-import / cat-blob: $!"; + $check =~ /\A[a-f0-9]{40} blob (\d+)\n\z/ or + die "unexpected cat-blob response: $check"; + my $left = $1; + my $offset = 0; + my $buf = ''; + while ($left > 0) { + my $n = read($r, $buf, $left, $offset); + defined($n) or die "read cat-blob failed: $!"; + $n == 0 and die 'fast-export (cat-blob) died'; + $left -= $n; + $offset += $n; + } + read($r, my $lf, 1); + die "bad read on final byte: <$lf>" if $lf ne "\n"; + my $cur = Email::MIME->new($buf); + if ($cur->header('Subject') ne $mime->header('Subject') || + $cur->body ne $mime->body) { + return (-1, $cur); + } + + my $ref = $self->{ref}; + my $commit = $self->{mark}++; + my $parent = $tip =~ /\A:/ ? $tip : undef; + unless ($parent) { + print $w "reset $ref\n" or wfail; + } + my $ident = $self->{ident}; + my $now = now2822(); + print $w "commit $ref\nmark :$commit\n", + "author $ident $now\n", + "committer $ident $now\n", + "data 3\nrm\n\n", + 'from ', ($parent ? $parent : $tip), "\n" or wfail; + print $w "D $path\n\n" or wfail; + (($self->{tip} = ":$commit"), $cur); +} + +# returns undef on duplicate +sub add { + my ($self, $mime) = @_; # mime = Email::MIME + + my $from = $mime->header('From'); + my @from = Email::Address->parse($from); + my $name = $from[0]->name; + my $email = $from[0]->address; + my $date = $mime->header('Date'); + my $subject = $mime->header('Subject'); + $subject = '(no subject)' unless defined $subject; + my $mid = mid_mime($mime); + my $path = mid2path($mid); + + my ($r, $w) = $self->gfi_start; + my $tip = $self->{tip}; + if ($tip ne '') { + print $w "ls $tip $path\n" or wfail; + local $/ = "\n"; + my $check = <$r>; + defined $check or die "EOF from fast-import: $!"; + return unless $check =~ /\Amissing /; + } + + # kill potentially confusing/misleading headers + $mime->header_set($_) for qw(bytes lines content-length status); + $mime = $mime->as_string; + my $blob = $self->{mark}++; + print $w "blob\nmark :$blob\ndata ", length($mime), "\n" or wfail; + print $w $mime, "\n" or wfail; + my $ref = $self->{ref}; + my $commit = $self->{mark}++; + my $parent = $tip =~ /\A:/ ? $tip : undef; + + unless ($parent) { + print $w "reset $ref\n" or wfail; + } + print $w "commit $ref\nmark :$commit\n", + "author $name <$email> $date\n", + "committer $self->{ident} ", now2822(), "\n", + "data ", (length($subject) + 1), "\n", + $subject, "\n\n" or wfail; + if ($tip ne '') { + print $w 'from ', ($parent ? $parent : $tip), "\n" or wfail; + } + print $w "M 100644 :$blob $path\n\n" or wfail; + $self->{tip} = ":$commit"; +} + +sub done { + my ($self) = @_; + my $w = delete $self->{out} or return; + my $r = delete $self->{in} or die 'BUG: missing {in} when done'; + print $w "done\n" or wfail; + my $pid = delete $self->{pid} or die 'BUG: missing {pid} when done'; + waitpid($pid, 0) == $pid or die 'fast-import did not finish'; + $? == 0 or die "fast-import failed: $?"; + my $lockfh = delete $self->{lockfh} or die "BUG: not locked: $!"; + flock($lockfh, LOCK_UN) or die "unlock failed: $!"; + close $lockfh or die "close lock failed: $!"; +} + +1; -- cgit v1.2.3-24-ge0c7