From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on dcvr.yhbt.net X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=ALL_TRUSTED,BAYES_00 shortcircuit=no autolearn=ham autolearn_force=no version=3.4.2 Received: from localhost (dcvr.yhbt.net [127.0.0.1]) by dcvr.yhbt.net (Postfix) with ESMTP id 1EF661FA12 for ; Mon, 18 Jan 2021 10:30:33 +0000 (UTC) From: Eric Wong To: meta@public-inbox.org Subject: [PATCH 2/2] lei_to_mail: optimize for MUAs Date: Mon, 18 Jan 2021 04:30:32 -0600 Message-Id: <20210118103032.1430-3-e@80x24.org> In-Reply-To: <20210118103032.1430-1-e@80x24.org> References: <20210118103032.1430-1-e@80x24.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit List-Id: Instead of optimizing our own performance, this optimizes our data to reduce work done by the MUA consumer. Maildir and mbox destinations no longer support any notion of the IMAP \Recent flag. JMAP has no functioning \Recent equivalent, and neither do we. In practice, having MUAs (e.g. mutt) clear the \Recent flag when committing changes to the mbox is expensive: it creates a rename(2) storm with Maildir and overwrites the entire mbox. For mboxcl2 (and mboxcl), we'll further optimize mutt behavior by setting the Lines: header in addition to Content-Length. With these changes, mutt exits instantaneously on mboxcl2, mboxcl, and Maildirs generated by "lei q". --- lib/PublicInbox/LeiToMail.pm | 30 ++++++++++++++++++++++-------- t/lei_to_mail.t | 16 +++++++++++----- t/mbox_reader.t | 2 ++ 3 files changed, 35 insertions(+), 13 deletions(-) diff --git a/lib/PublicInbox/LeiToMail.pm b/lib/PublicInbox/LeiToMail.pm index 17d48a90..1281aef4 100644 --- a/lib/PublicInbox/LeiToMail.pm +++ b/lib/PublicInbox/LeiToMail.pm @@ -35,7 +35,11 @@ my %kw2status = ( sub _mbox_hdr_buf ($$$) { my ($eml, $type, $kw) = @_; $eml->header_set($_) for (qw(Lines Bytes Content-Length)); - my %hdr; # set Status, X-Status + + # Messages are always 'O' (non-\Recent in IMAP), it saves + # MUAs the trouble of rewriting the mbox if no other + # changes are made + my %hdr = (Status => [ 'O' ]); # set Status, X-Status for my $k (@$kw) { if (my $ent = $kw2status{$k}) { push @{$hdr{$ent->[0]}}, $ent->[1]; @@ -93,6 +97,16 @@ sub eml2mboxo { $buf; } +sub _mboxcl_common ($$$) { + my ($buf, $bdy, $crlf) = @_; + # add Lines: so mutt won't have to add it on MUA close + my $lines = $$bdy =~ tr!\n!\n!; + $$buf .= 'Content-Length: '.length($$bdy).$crlf. + 'Lines: '.$lines.$crlf.$crlf; + substr($$bdy, 0, 0, $$buf); # prepend header + $_[0] = $bdy; +} + # mboxcl still escapes "From " lines sub eml2mboxcl { my ($eml, $kw) = @_; @@ -100,9 +114,7 @@ sub eml2mboxcl { my $crlf = $eml->{crlf}; if (my $bdy = delete $eml->{bdy}) { $$bdy =~ s/^From />From /gm; - $$buf .= 'Content-Length: '.length($$bdy).$crlf.$crlf; - substr($$bdy, 0, 0, $$buf); # prepend header - $buf = $bdy; + _mboxcl_common($buf, $bdy, $crlf); } $$buf .= $crlf; $buf; @@ -114,9 +126,7 @@ sub eml2mboxcl2 { my $buf = _mbox_hdr_buf($eml, 'mboxcl2', $kw); my $crlf = $eml->{crlf}; if (my $bdy = delete $eml->{bdy}) { - $$buf .= 'Content-Length: '.length($$bdy).$crlf.$crlf; - substr($$bdy, 0, 0, $$buf); # prepend header - $buf = $bdy; + _mboxcl_common($buf, $bdy, $crlf); } $$buf .= $crlf; $buf; @@ -277,7 +287,11 @@ sub _buf2maildir { } while (!sysopen($fh, $tmp, O_CREAT|O_EXCL|O_WRONLY) && $! == EEXIST && ($rand = int(rand 0x7fffffff).',')); if (print $fh $$buf and close($fh)) { - $dst .= $sfx eq '' ? 'new/' : 'cur/'; + # ignore new/ and write only to cur/, otherwise MUAs + # with R/W access to the Maildir will end up doing + # a mass rename which can take a while with thousands + # of messages. + $dst .= 'cur/'; $rand = ''; do { $final = $dst.$rand."oid=$oid:2,$sfx"; diff --git a/t/lei_to_mail.t b/t/lei_to_mail.t index 083e0df4..e5ac8eac 100644 --- a/t/lei_to_mail.t +++ b/t/lei_to_mail.t @@ -25,7 +25,7 @@ for my $mbox (@MBOX) { my $s = $cb->(PublicInbox::Eml->new($from), $kw); is(substr($$s, -1, 1), "\n", "trailing LF in normal $mbox"); my $eml = PublicInbox::Eml->new($s); - is($eml->header('Status'), 'R', "Status: set by $m"); + is($eml->header('Status'), 'OR', "Status: set by $m"); is($eml->header('X-Status'), 'AF', "X-Status: set by $m"); if ($mbox eq 'mboxcl2') { like($eml->body_raw, qr/^From /, "From not escaped $m"); @@ -170,6 +170,12 @@ for my $zsfx (qw(gz bz2 xz)) { # XXX should we support zst, zz, lzo, lzma? } } +my $as_orig = sub { + my ($eml) = @_; + $eml->header_set('Status'); + $eml->as_string; +}; + unlink $fn or BAIL_OUT $!; if ('default deduplication uses content_hash') { my $wcb = $wcb_get->('mboxo', $fn); @@ -177,7 +183,7 @@ if ('default deduplication uses content_hash') { undef $wcb; # undef to commit changes my $cmp = ''; open my $fh, '<', $fn or BAIL_OUT $!; - PublicInbox::MboxReader->mboxo($fh, sub { $cmp .= shift->as_string }); + PublicInbox::MboxReader->mboxo($fh, sub { $cmp .= $as_orig->(@_) }); is($cmp, $buf, 'only one message written'); local $lei->{opt} = { augment => 1 }; @@ -186,7 +192,7 @@ if ('default deduplication uses content_hash') { undef $wcb; # undef to commit changes open $fh, '<', $fn or BAIL_OUT $!; my @x; - PublicInbox::MboxReader->mboxo($fh, sub { push @x, shift->as_string }); + PublicInbox::MboxReader->mboxo($fh, sub { push @x, $as_orig->(@_) }); is(scalar(@x), 2, 'augmented mboxo'); is($x[0], $cmp, 'original message preserved'); is($x[1], $buf . "\nx\n", 'new message appended'); @@ -200,7 +206,7 @@ if ('default deduplication uses content_hash') { undef $wcb; # commit seek($tmp, 0, SEEK_SET) or BAIL_OUT $!; my $cmp = ''; - PublicInbox::MboxReader->mboxrd($tmp, sub { $cmp .= shift->as_string }); + PublicInbox::MboxReader->mboxrd($tmp, sub { $cmp .= $as_orig->(@_) }); is($cmp, $buf, 'message written to stdout'); } @@ -213,7 +219,7 @@ SKIP: { # FIFO support $wcb->(\(my $x = $buf), 'deadbeef', []); undef $wcb; # commit my $cmp = ''; - PublicInbox::MboxReader->mboxo($cat, sub { $cmp .= shift->as_string }); + PublicInbox::MboxReader->mboxo($cat, sub { $cmp .= $as_orig->(@_) }); is($cmp, $buf, 'message written to FIFO'); } diff --git a/t/mbox_reader.t b/t/mbox_reader.t index 4ea2ae29..30a5e6e3 100644 --- a/t/mbox_reader.t +++ b/t/mbox_reader.t @@ -45,6 +45,8 @@ my $check_fmt = sub { seek($fh, 0, SEEK_SET) or BAIL_OUT "seek: $!"; $reader->$fmt($fh, sub { my ($eml) = @_; + $eml->header_set('Status'); + $eml->header_set('Lines'); my $cur = shift @order; my @cl = $eml->header_raw('Content-Length'); if ($fmt =~ /\Amboxcl/) {