# Copyright (C) 2018 all contributors
# License: AGPL-3.0+
# used to interface with a single Xapian shard in V2 repos.
# See L for more info on how we shard Xapian
package PublicInbox::SearchIdxShard;
use strict;
use warnings;
use base qw(PublicInbox::SearchIdx);
sub new {
my ($class, $v2writable, $shard) = @_;
my $self = $class->SUPER::new($v2writable->{-inbox}, 1, $shard);
# create the DB before forking:
$self->_xdb_acquire;
$self->_xdb_release;
$self->spawn_worker($v2writable, $shard) if $v2writable->{parallel};
$self;
}
sub spawn_worker {
my ($self, $v2writable, $shard) = @_;
my ($r, $w);
pipe($r, $w) or die "pipe failed: $!\n";
binmode $r, ':raw';
binmode $w, ':raw';
my $pid = fork;
defined $pid or die "fork failed: $!\n";
if ($pid == 0) {
my $bnote = $v2writable->atfork_child;
$v2writable = undef;
close $w or die "failed to close: $!";
# F_SETPIPE_SZ = 1031 on Linux; increasing the pipe size here
# speeds V2Writable batch imports across 8 cores by nearly 20%
fcntl($r, 1031, 1048576) if $^O eq 'linux';
eval { shard_worker_loop($self, $r, $shard, $bnote) };
die "worker $shard died: $@\n" if $@;
die "unexpected MM $self->{mm}" if $self->{mm};
exit;
}
$self->{pid} = $pid;
$self->{w} = $w;
close $r or die "failed to close: $!";
}
sub shard_worker_loop ($$$$) {
my ($self, $r, $shard, $bnote) = @_;
$0 = "pi-v2-shard[$shard]";
my $current_info = '';
my $warn_cb = $SIG{__WARN__} || sub { print STDERR @_ };
local $SIG{__WARN__} = sub {
chomp $current_info;
$warn_cb->("[$shard] $current_info: ", @_);
};
$self->begin_txn_lazy;
while (my $line = $r->getline) {
$current_info = $line;
if ($line eq "commit\n") {
$self->commit_txn_lazy;
} elsif ($line eq "close\n") {
$self->_xdb_release;
} elsif ($line eq "barrier\n") {
$self->commit_txn_lazy;
# no need to lock < 512 bytes is atomic under POSIX
print $bnote "barrier $shard\n" or
die "write failed for barrier $!\n";
} elsif ($line =~ /\AD ([a-f0-9]{40,}) (.+)\n\z/s) {
my ($oid, $mid) = ($1, $2);
$self->begin_txn_lazy;
$self->remove_by_oid($oid, $mid);
} else {
chomp $line;
my ($len, $artnum, $oid, $mid0) = split(/ /, $line);
$self->begin_txn_lazy;
my $n = read($r, my $msg, $len) or die "read: $!\n";
$n == $len or die "short read: $n != $len\n";
my $mime = PublicInbox::MIME->new(\$msg);
$artnum = int($artnum);
$self->add_message($mime, $n, $artnum, $oid, $mid0);
}
}
$self->worker_done;
}
# called by V2Writable
sub index_raw {
my ($self, $bytes, $msgref, $artnum, $oid, $mid0, $mime) = @_;
if (my $w = $self->{w}) {
print $w "$bytes $artnum $oid $mid0\n", $$msgref or die
"failed to write shard $!\n";
$w->flush or die "failed to flush: $!\n";
} else {
$$msgref = undef;
$self->begin_txn_lazy;
$self->add_message($mime, $bytes, $artnum, $oid, $mid0);
}
}
sub atfork_child {
close $_[0]->{w} or die "failed to close write pipe: $!\n";
}
# called by V2Writable:
sub remote_barrier {
my ($self) = @_;
if (my $w = $self->{w}) {
print $w "barrier\n" or die "failed to print: $!";
$w->flush or die "failed to flush: $!";
} else {
$self->commit_txn_lazy;
}
}
1;