[PATCH 2/2] lei convert: support reading from v1, v2, and extindex

[Eric Wong <e@80x24.org>]

We should be able to dump all public-inbox and extindex directories
to Maildir/mbox* or IMAP folders.  Even unindexed inboxes can be
dumped as long as inbox.lock (or ssoma.lock) exists.

This change likely works for `lei tag' and other lei_input-using
things, as well, but that's untested at the moment.  I mainly
want to be able to use `lei convert' to benchmark some upcoming
changes...
---
 lib/PublicInbox/ExtSearch.pm |  6 ++--
 lib/PublicInbox/LeiInput.pm  | 70 +++++++++++++++++++++++++++++++-----
 t/extsearch.t                | 24 +++++++++++++
 t/lei-convert.t              | 40 +++++++++++++++++++++
 4 files changed, 129 insertions(+), 11 deletions(-)

diff --git a/lib/PublicInbox/ExtSearch.pm b/lib/PublicInbox/ExtSearch.pm
index fa49a1d0..d43c23e6 100644
--- a/lib/PublicInbox/ExtSearch.pm
+++ b/lib/PublicInbox/ExtSearch.pm
@@ -33,9 +33,11 @@ sub misc {
 # same as per-inbox ->over, for now...
 sub over {
 	my ($self) = @_;
-	$self->{over} //= do {
+	$self->{over} // eval {
 		PublicInbox::Inbox::_cleanup_later($self);
-		PublicInbox::Over->new("$self->{xpfx}/over.sqlite3");
+		my $over = PublicInbox::Over->new("$self->{xpfx}/over.sqlite3");
+		$over->dbh; # may die
+		$self->{over} = $over;
 	};
 }
 
diff --git a/lib/PublicInbox/LeiInput.pm b/lib/PublicInbox/LeiInput.pm
index f88c5374..58069b0a 100644
--- a/lib/PublicInbox/LeiInput.pm
+++ b/lib/PublicInbox/LeiInput.pm
@@ -125,6 +125,51 @@ sub handle_http_input ($$@) {
 	$lei->child_error($?, "@$cmd failed: @err") if @err;
 }
 
+sub oid2eml { # git->cat_async cb
+	my ($bref, $oid, $type, $size, $self) = @_;
+	if ($type eq 'blob') {
+		$self->input_eml_cb(PublicInbox::Eml->new($bref));
+	} else {
+		warn "W: $oid is type=$type\n";
+	}
+}
+
+sub each_ibx_eml_unindexed {
+	my ($self, $ibx, @args) = @_;
+	$ibx->isa('PublicInbox::Inbox') or return $self->{lei}->fail(<<EOM);
+unindexed extindex $ibx->{topdir} not supported
+EOM
+	require PublicInbox::SearchIdx;
+	my $n = $ibx->max_git_epoch;
+	my @g = defined($n) ? map { $ibx->git_epoch($_) } (0..$n) : ($ibx->git);
+	my $sync = { D => {}, ibx => $ibx }; # D => {} filters out deletes
+	my ($f, $at, $ct, $oid, $cmt);
+	for my $git (grep defined, @g) {
+		my $s = PublicInbox::SearchIdx::log2stack($sync, $git, 'HEAD');
+		while (($f, $at, $ct, $oid, $cmt) = $s->pop_rec) {
+			$git->cat_async($oid, \&oid2eml, $self) if $f eq 'm';
+		}
+		$git->cleanup; # wait all
+	}
+}
+
+sub each_ibx_eml {
+	my ($self, $ibx, @args) = @_; # TODO: is @args used at all?
+	my $over = $ibx->over or return each_ibx_eml_unindexed(@_);
+	my $git = $ibx->git;
+	my $prev = 0;
+	my $smsg;
+	my $ids = $over->ids_after(\$prev);
+	while (@$ids) {
+		for (@$ids) {
+			$smsg = $over->get_art($_) // next;
+			$git->cat_async($smsg->{blob}, \&oid2eml, $self);
+		}
+		$ids = $over->ids_after(\$prev);
+	}
+	$git->cat_async_wait;
+}
+
 sub input_path_url {
 	my ($self, $input, @args) = @_;
 	my $lei = $self->{lei};
@@ -191,6 +236,12 @@ sub input_path_url {
 						$self->can('input_maildir_cb'),
 						$self, @args);
 		}
+	} elsif (-d _ && $ifmt =~ /\A(?:v1|v2)\z/) {
+		my $ibx = PublicInbox::Inbox->new({inboxdir => $input});
+		each_ibx_eml($self, $ibx, @args);
+	} elsif (-d _ && $ifmt eq 'extindex') {
+		my $esrch = PublicInbox::ExtSearch->new($input);
+		each_ibx_eml($self, $esrch, @args);
 	} elsif ($self->{missing_ok} && !-e $input) { # don't ->fail
 		if ($lei->{cmd} eq 'p2q') {
 			my $fp = [ qw(git format-patch --stdout -1), $input ];
@@ -308,9 +359,9 @@ sub prepare_inputs { # returns undef on error
 				require PublicInbox::MboxReader;
 				PublicInbox::MboxReader->reads($ifmt) or return
 					$lei->fail("$ifmt not supported");
-			} elsif (-d $input_path) {
-				$ifmt eq 'maildir' or return # TODO v1/v2/ei
-					$lei->fail("$ifmt not supported");
+			} elsif (-d $input_path) { # TODO extindex
+				$ifmt =~ /\A(?:maildir|v1|v2|extindex)\z/ or
+					return$lei->fail("$ifmt not supported");
 				$input = $input_path;
 				add_dir $lei, $istate, $ifmt, \$input;
 			} elsif ($self->{missing_ok} && !-e _) {
@@ -350,12 +401,12 @@ $input is `eml', not --in-format=$in_fmt
 				push @f, $input;
 			} elsif (-d "$input/new" && -d "$input/cur") {
 				add_dir $lei, $istate, 'maildir', \$input;
-			} elsif (-e "$input/inbox.lock") { # TODO
-				$lei->fail('v2 inputs not yet supported (TODO)');
-				#add_dir $lei, $istate, 'v2', \$input;
-			} elsif (-e "$input/ssoma.lock") { # TODO
-				$lei->fail('v1 inputs not yet supported (TODO)');
-				#add_dir $lei, $istate, 'v1', \$input;
+			} elsif (-e "$input/inbox.lock") {
+				add_dir $lei, $istate, 'v2', \$input;
+			} elsif (-e "$input/ssoma.lock") {
+				add_dir $lei, $istate, 'v1', \$input;
+			} elsif (-e "$input/ei.lock") {
+				add_dir $lei, $istate, 'extindex', \$input;
 			} elsif ($self->{missing_ok} && !-e $input) {
 				if ($lei->{cmd} eq 'p2q') {
 					# will run "git format-patch"
@@ -401,6 +452,7 @@ $input is `eml', not --in-format=$in_fmt
 			$lei->refresh_watches;
 		}
 	}
+	require PublicInbox::ExtSearch if $istate->{extindex};
 	$self->{inputs} = $inputs;
 }
 
diff --git a/t/extsearch.t b/t/extsearch.t
index 8ded3382..19eaf3b5 100644
--- a/t/extsearch.t
+++ b/t/extsearch.t
@@ -581,4 +581,28 @@ EOM
 	}
 }
 
+test_lei(sub {
+	my $d = "$home/extindex";
+	lei_ok('convert', '-o', "$home/md1", $d);
+	lei_ok('convert', '-o', "$home/md2", "extindex:$d");
+	my $dst = [];
+	my $cb = sub { push @$dst, $_[2]->as_string };
+	require PublicInbox::MdirReader;
+	PublicInbox::MdirReader->new->maildir_each_eml("$home/md1", $cb);
+	my @md1 = sort { $a cmp $b } @$dst;
+	ok(scalar(@md1), 'dumped messages to md1');
+	$dst = [];
+	PublicInbox::MdirReader->new->maildir_each_eml("$home/md2", $cb);
+	@$dst = sort { $a cmp $b } @$dst;
+	is_deeply($dst, \@md1,
+		"convert from extindex w/ or w/o `extindex' prefix");
+
+	use autodie qw(unlink);
+	my @o = glob "$home/extindex/ei*/over.sqlite*";
+	unlink(@o);
+	ok(!lei('convert', '-o', "$home/fail", "extindex:$d"));
+	like($lei_err, qr/unindexed .*?not supported/,
+		'noted unindexed extindex is unsupported');
+});
+
 done_testing;
diff --git a/t/lei-convert.t b/t/lei-convert.t
index 115e7ed0..d75110cb 100644
--- a/t/lei-convert.t
+++ b/t/lei-convert.t
@@ -7,6 +7,8 @@ use PublicInbox::MdirReader;
 use PublicInbox::NetReader;
 use PublicInbox::Eml;
 use IO::Uncompress::Gunzip;
+use File::Path qw(remove_tree);
+use PublicInbox::Spawn qw(which);
 use autodie qw(open);
 require_mods(qw(lei -imapd -nntpd Mail::IMAPClient Net::NNTP));
 my ($tmpdir, $for_destroy) = tmpdir;
@@ -148,5 +150,43 @@ test_lei({ tmpdir => $tmpdir }, sub {
 		});
 		is_deeply(\@tmp, \@bar, 'read rsyncable-gzipped mboxcl2');
 	}
+	my $cp = which('cp') or xbail 'cp(1) not available (WTF?)';
+	for my $v (1, 2) {
+		my $ibx_dir = "$ro_home/t$v";
+		lei_ok qw(convert -f mboxrd), $ibx_dir,
+				\"dump v$v inbox to mboxrd";
+		my $out = $lei_out;
+		lei_ok qw(convert -f mboxrd), "v$v:$ibx_dir",
+				\"dump v$v inbox to mboxrd w/ v$v:// prefix";
+		is $out, $lei_out, "v$v:// prefix accepted";
+		open my $fh, '<', \$out;
+		my (@mb, @md, @md2);
+		PublicInbox::MboxReader->mboxrd($fh, sub {
+			$_[0]->header_set('Status');
+			push @mb, $_[0]->as_string;
+		});
+		undef $out;
+		ok(scalar(@mb), 'got messages output');
+		my $mdir = "$d/v$v-mdir";
+		lei_ok qw(convert -o), $mdir, $ibx_dir,
+			\"dump v$v inbox to Maildir";
+		PublicInbox::MdirReader->new->maildir_each_eml($mdir, sub {
+			push @md, $_[2]->as_string;
+		});
+		@md = sort { $a cmp $b } @md;
+		@mb = sort { $a cmp $b } @mb;
+		is_deeply(\@mb, \@md, 'got matching inboxes');
+		xsys_e([$cp, '-Rp', $ibx_dir, "$d/tv$v" ]);
+		remove_tree($mdir, "$d/tv$v/public-inbox",
+				glob("$d/tv$v/xap*"));
+
+		lei_ok qw(convert -o), $mdir, "$d/tv$v",
+			\"dump u indexed v$v inbox to Maildir";
+		PublicInbox::MdirReader->new->maildir_each_eml($mdir, sub {
+			push @md2, $_[2]->as_string;
+		});
+		@md2 = sort { $a cmp $b } @md2;
+		is_deeply(\@md, \@md2, 'got matching inboxes even unindexed');
+	}
 });
 done_testing;