# Copyright (C) 2016-2020 all contributors
# License: AGPL-3.0+
#
# Represents a public-inbox (which may have multiple mailing addresses)
package PublicInbox::Inbox;
use strict;
use warnings;
use PublicInbox::Git;
use PublicInbox::MID qw(mid2path);
use PublicInbox::Eml;
# Long-running "git-cat-file --batch" processes won't notice
# unlinked packs, so we need to restart those processes occasionally.
# Xapian and SQLite file handles are mostly stable, but sometimes an
# admin will attempt to replace them atomically after compact/vacuum
# and we need to be prepared for that.
my $cleanup_timer;
my $cleanup_avail = -1; # 0, or 1
my $have_devel_peek;
my $CLEANUP = {}; # string(inbox) -> inbox
sub cleanup_task () {
$cleanup_timer = undef;
my $next = {};
for my $ibx (values %$CLEANUP) {
my $again;
if ($have_devel_peek) {
foreach my $f (qw(mm search over)) {
# we bump refcnt by assigning tmp, here:
my $tmp = $ibx->{$f} or next;
next if Devel::Peek::SvREFCNT($tmp) > 2;
delete $ibx->{$f};
# refcnt is zero when tmp is out-of-scope
}
}
if (my $git = $ibx->{git}) {
$again = $git->cleanup;
}
if (my $gits = $ibx->{-repo_objs}) {
foreach my $git (@$gits) {
$again = 1 if $git->cleanup;
}
}
if ($have_devel_peek) {
$again ||= !!($ibx->{over} || $ibx->{mm} ||
$ibx->{search});
}
$next->{"$ibx"} = $ibx if $again;
}
$CLEANUP = $next;
}
sub cleanup_possible () {
# no need to require DS, here, if it were enabled another
# module would've require'd it, already
eval { PublicInbox::DS::in_loop() } or return 0;
eval {
require Devel::Peek; # needs separate package in Fedora
$have_devel_peek = 1;
};
1;
}
sub _cleanup_later ($) {
my ($self) = @_;
$cleanup_avail = cleanup_possible() if $cleanup_avail < 0;
return if $cleanup_avail != 1;
$cleanup_timer ||= PublicInbox::DS::later(*cleanup_task);
$CLEANUP->{"$self"} = $self;
}
sub _set_uint ($$$) {
my ($opts, $field, $default) = @_;
my $val = $opts->{$field};
if (defined $val) {
$val = $val->[-1] if ref($val) eq 'ARRAY';
$val = undef if $val !~ /\A[0-9]+\z/;
}
$opts->{$field} = $val || $default;
}
sub _set_limiter ($$$) {
my ($self, $pi_config, $pfx) = @_;
my $lkey = "-${pfx}_limiter";
$self->{$lkey} ||= do {
# full key is: publicinbox.$NAME.httpbackendmax
my $mkey = $pfx.'max';
my $val = $self->{$mkey} or return;
my $lim;
if ($val =~ /\A[0-9]+\z/) {
require PublicInbox::Qspawn;
$lim = PublicInbox::Qspawn::Limiter->new($val);
} elsif ($val =~ /\A[a-z][a-z0-9]*\z/) {
$lim = $pi_config->limiter($val);
warn "$mkey limiter=$val not found\n" if !$lim;
} else {
warn "$mkey limiter=$val not understood\n";
}
$lim;
}
}
sub new {
my ($class, $opts) = @_;
my $v = $opts->{address} ||= 'public-inbox@example.com';
my $p = $opts->{-primary_address} = ref($v) eq 'ARRAY' ? $v->[0] : $v;
$opts->{domain} = ($p =~ /\@(\S+)\z/) ? $1 : 'localhost';
my $pi_config = delete $opts->{-pi_config};
_set_limiter($opts, $pi_config, 'httpbackend');
_set_uint($opts, 'feedmax', 25);
$opts->{nntpserver} ||= $pi_config->{'publicinbox.nntpserver'};
my $dir = $opts->{inboxdir};
if (defined $dir && -f "$dir/inbox.lock") {
$opts->{version} = 2;
}
# allow any combination of multi-line or comma-delimited hide entries
my $hide = {};
if (defined(my $h = $opts->{hide})) {
foreach my $v (@$h) {
$hide->{$_} = 1 foreach (split(/\s*,\s*/, $v));
}
$opts->{-hide} = $hide;
}
bless $opts, $class;
}
sub version { $_[0]->{version} // 1 }
sub git_epoch {
my ($self, $epoch) = @_;
$self->version == 2 or return;
$self->{"$epoch.git"} ||= do {
my $git_dir = "$self->{inboxdir}/git/$epoch.git";
my $g = PublicInbox::Git->new($git_dir);
$g->{-httpbackend_limiter} = $self->{-httpbackend_limiter};
# no cleanup needed, we never cat-file off this, only clone
$g;
};
}
sub git {
my ($self) = @_;
$self->{git} ||= do {
my $git_dir = $self->{inboxdir};
$git_dir .= '/all.git' if $self->version == 2;
my $g = PublicInbox::Git->new($git_dir);
$g->{-httpbackend_limiter} = $self->{-httpbackend_limiter};
_cleanup_later($self);
$g;
};
}
sub max_git_epoch {
my ($self) = @_;
return if $self->version < 2;
my $cur = $self->{-max_git_epoch};
my $changed = git($self)->alternates_changed;
if (!defined($cur) || $changed) {
$self->git->cleanup if $changed;
my $gits = "$self->{inboxdir}/git";
if (opendir my $dh, $gits) {
my $max = -1;
while (defined(my $git_dir = readdir($dh))) {
$git_dir =~ m!\A([0-9]+)\.git\z! or next;
$max = $1 if $1 > $max;
}
$cur = $self->{-max_git_epoch} = $max if $max >= 0;
} else {
warn "opendir $gits failed: $!\n";
}
}
$cur;
}
sub mm {
my ($self) = @_;
$self->{mm} ||= eval {
require PublicInbox::Msgmap;
_cleanup_later($self);
my $dir = $self->{inboxdir};
if ($self->version >= 2) {
PublicInbox::Msgmap->new_file("$dir/msgmap.sqlite3");
} else {
PublicInbox::Msgmap->new($dir);
}
};
}
sub search ($;$) {
my ($self, $over_only) = @_;
my $srch = $self->{search} ||= eval {
_cleanup_later($self);
require PublicInbox::Search;
PublicInbox::Search->new($self);
};
($over_only || eval { $srch->xdb }) ? $srch : undef;
}
sub over ($) {
my ($self) = @_;
my $srch = search($self, 1) or return;
$self->{over} ||= eval {
my $over = $srch->{over_ro};
$over->dbh_new; # may fail
$over;
}
}
sub try_cat {
my ($path) = @_;
my $rv = '';
if (open(my $fh, '<', $path)) {
local $/;
$rv = <$fh>;
}
$rv;
}
sub description {
my ($self) = @_;
($self->{description} //= do {
my $desc = try_cat("$self->{inboxdir}/description");
local $/ = "\n";
chomp $desc;
$desc =~ s/\s+/ /smg;
$desc eq '' ? undef : $desc;
}) // '($INBOX_DIR/description missing)';
}
sub cloneurl {
my ($self) = @_;
($self->{cloneurl} //= do {
my $s = try_cat("$self->{inboxdir}/cloneurl");
my @urls = split(/\s+/s, $s);
scalar(@urls) ? \@urls : undef
}) // [];
}
sub base_url {
my ($self, $env) = @_; # env - PSGI env
if ($env) {
my $url = PublicInbox::Git::host_prefix_url($env, '');
# for mount in Plack::Builder
$url .= '/' if $url !~ m!/\z!;
return $url .= $self->{name} . '/';
}
# called from a non-PSGI environment (e.g. NNTP/POP3):
$self->{-base_url} ||= do {
my $url = $self->{url}->[0] or return undef;
# expand protocol-relative URLs to HTTPS if we're
# not inside a web server
$url = "https:$url" if $url =~ m!\A//!;
$url .= '/' if $url !~ m!/\z!;
$url;
};
}
sub nntp_url {
my ($self) = @_;
$self->{-nntp_url} ||= do {
# no checking for nntp_usable here, we can point entirely
# to non-local servers or users run by a different user
my $ns = $self->{nntpserver};
my $group = $self->{newsgroup};
my @urls;
if ($ns && $group) {
$ns = [ $ns ] if ref($ns) ne 'ARRAY';
@urls = map {
my $u = m!\Anntps?://! ? $_ : "nntp://$_";
$u .= '/' if $u !~ m!/\z!;
$u.$group;
} @$ns;
}
my $mirrors = $self->{nntpmirror};
if ($mirrors) {
my @m;
foreach (@$mirrors) {
my $u = m!\Anntps?://! ? $_ : "nntp://$_";
if ($u =~ m!\Anntps?://[^/]+/?\z!) {
if ($group) {
$u .= '/' if $u !~ m!/\z!;
$u .= $group;
} else {
warn
"publicinbox.$self->{name}.nntpmirror=$_ missing newsgroup name\n";
}
}
# else: allow full URLs like:
# nntp://news.example.com/alt.example
push @m, $u;
}
# List::Util::uniq requires Perl 5.26+, maybe we
# can use it by 2030 or so
my %seen;
@urls = grep { !$seen{$_}++ } (@urls, @m);
}
\@urls;
};
}
sub nntp_usable {
my ($self) = @_;
my $ret = mm($self) && over($self);
$self->{mm} = $self->{over} = $self->{search} = undef;
$ret;
}
# for v1 users w/o SQLite only
sub msg_by_path ($$;$) {
my ($self, $path, $ref) = @_;
git($self)->cat_file('HEAD:'.$path, $ref);
}
sub msg_by_smsg ($$;$) {
my ($self, $smsg, $ref) = @_;
# ghosts may have undef smsg (from SearchThread.node) or
# no {blob} field
return unless defined $smsg;
defined(my $blob = $smsg->{blob}) or return;
git($self)->cat_file($blob, $ref);
}
sub smsg_mime {
my ($self, $smsg, $ref) = @_;
if (my $s = msg_by_smsg($self, $smsg, $ref)) {
$smsg->{mime} = PublicInbox::Eml->new($s);
return $smsg;
}
}
sub mid2num($$) {
my ($self, $mid) = @_;
my $mm = mm($self) or return;
$mm->num_for($mid);
}
sub smsg_by_mid ($$) {
my ($self, $mid) = @_;
my $over = over($self) or return;
# favor the Message-ID we used for the NNTP article number:
defined(my $num = mid2num($self, $mid)) or return;
my $smsg = $over->get_art($num) or return;
PublicInbox::Smsg::psgi_cull($smsg);
}
sub msg_by_mid ($$;$) {
my ($self, $mid, $ref) = @_;
over($self) or
return msg_by_path($self, mid2path($mid), $ref);
my $smsg = smsg_by_mid($self, $mid);
$smsg ? msg_by_smsg($self, $smsg, $ref) : undef;
}
sub recent {
my ($self, $opts, $after, $before) = @_;
over($self)->recent($opts, $after, $before);
}
sub modified {
my ($self) = @_;
if (my $over = over($self)) {
my $msgs = $over->recent({limit => 1});
if (my $smsg = $msgs->[0]) {
return $smsg->{ts};
}
return time;
}
git($self)->modified; # v1
}
# returns prefix => pathname mapping
# (pathname is NOT public, but prefix is used for Xapian queries)
sub altid_map ($) {
my ($self) = @_;
$self->{-altid_map} //= eval {
require PublicInbox::AltId;
my $altid = $self->{altid} or return {};
my %h = map {;
my $x = PublicInbox::AltId->new($self, $_);
"$x->{prefix}" => $x->{filename}
} @$altid;
\%h;
} // {};
}
1;