-# Copyright (C) 2016-2019 all contributors <meta@public-inbox.org>
+# Copyright (C) 2016-2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# Like most Perl modules in public-inbox, this is internal and
use strict;
use warnings;
use PublicInbox::Spawn qw(popen_rd);
-require Plack::Util;
# n.b.: we get EAGAIN with public-inbox-httpd, and EINTR on other PSGI servers
use Errno qw(EAGAIN EINTR);
sub _do_spawn {
my ($self, $start_cb, $limiter) = @_;
my $err;
- my ($cmd, $cmd_env, $opts) = @{$self->{args}};
- my %opts = %{$opts || {}};
+ my ($cmd, $cmd_env, $opt) = @{delete $self->{args}};
+ my %o = %{$opt || {}};
$self->{limiter} = $limiter;
foreach my $k (PublicInbox::Spawn::RLIMITS()) {
if (defined(my $rlimit = $limiter->{$k})) {
- $opts{$k} = $rlimit;
+ $o{$k} = $rlimit;
}
}
+ $self->{cmd} = $o{quiet} ? undef : $cmd;
+ eval {
+ # popen_rd may die on EMFILE, ENFILE
+ ($self->{rpipe}, $self->{pid}) = popen_rd($cmd, $cmd_env, \%o);
- ($self->{rpipe}, $self->{pid}) = popen_rd($cmd, $cmd_env, \%opts);
+ die "E: $!" unless defined($self->{pid});
- # drop any IO handles opt was holding open via $opt->{hold}
- # No need to hold onto the descriptor once the child process has it.
- $self->{args} = $cmd; # keep this around for logging
-
- if (defined $self->{pid}) {
$limiter->{running}++;
- } else {
- $self->{err} = $!;
- }
- $start_cb->($self);
+ $start_cb->($self); # EPOLL_CTL_ADD may ENOSPC/ENOMEM
+ };
+ finish($self, $@) if $@;
}
sub child_err ($) {
$env->{'psgi.errors'}->print($msg, "\n");
}
-# callback for dwaitpid
-sub waitpid_err ($$) {
- my ($self, $pid) = @_;
- my $xpid = delete $self->{pid};
- my $err;
- if ($pid > 0) { # success!
- $err = child_err($?);
- } elsif ($pid < 0) { # ??? does this happen in our case?
- $err = "W: waitpid($xpid, 0) => $pid: $!";
- } # else should not be called with pid == 0
+sub finalize ($$) {
+ my ($self, $err) = @_;
my ($env, $qx_cb, $qx_arg, $qx_buf) =
delete @$self{qw(psgi_env qx_cb qx_arg qx_buf)};
}
if ($err) {
- $self->{err} = $err;
- if ($env && !$env->{'qspawn.quiet'}) {
- log_err($env, join(' ', @{$self->{args}}) . ": $err");
+ if (defined $self->{err}) {
+ $self->{err} .= "; $err";
+ } else {
+ $self->{err} = $err;
+ }
+ if ($env && $self->{cmd}) {
+ log_err($env, join(' ', @{$self->{cmd}}) . ": $err");
}
}
- eval { $qx_cb->($qx_buf, $qx_arg) } if $qx_cb;
+ if ($qx_cb) {
+ eval { $qx_cb->($qx_buf, $qx_arg) };
+ } elsif (my $wcb = delete $env->{'qspawn.wcb'}) {
+ # have we started writing, yet?
+ require PublicInbox::WwwStatic;
+ $wcb->(PublicInbox::WwwStatic::r(500));
+ }
+}
+
+# callback for dwaitpid
+sub waitpid_err ($$) {
+ my ($self, $pid) = @_;
+ my $xpid = delete $self->{pid};
+ my $err;
+ if (defined $pid) {
+ if ($pid > 0) { # success!
+ $err = child_err($?);
+ } elsif ($pid < 0) { # ??? does this happen in our case?
+ $err = "W: waitpid($xpid, 0) => $pid: $!";
+ } # else should not be called with pid == 0
+ }
+ finalize($self, $err);
}
sub do_waitpid ($) {
}
}
-sub finish ($) {
- my ($self) = @_;
+sub finish ($;$) {
+ my ($self, $err) = @_;
if (delete $self->{rpipe}) {
do_waitpid($self);
} else {
- my ($env, $qx_cb, $qx_arg, $qx_buf) =
- delete @$self{qw(psgi_env qx_cb qx_arg qx_buf)};
- eval { $qx_cb->($qx_buf, $qx_arg) } if $qx_cb;
+ finalize($self, $err);
}
}
}
}
+sub psgi_qx_init_cb {
+ my ($self) = @_;
+ my $async = delete $self->{async};
+ my ($r, $buf);
+ my $qx_fh = $self->{qx_fh};
+reread:
+ $r = sysread($self->{rpipe}, $buf, 65536);
+ if ($async) {
+ $async->async_pass($self->{psgi_env}->{'psgix.io'},
+ $qx_fh, \$buf);
+ } elsif (defined $r) {
+ $r ? (print $qx_fh $buf) : event_step($self, undef);
+ } else {
+ return if $! == EAGAIN; # try again when notified
+ goto reread if $! == EINTR;
+ event_step($self, $!);
+ }
+}
+
+sub psgi_qx_start {
+ my ($self) = @_;
+ if (my $async = $self->{psgi_env}->{'pi-httpd.async'}) {
+ # PublicInbox::HTTPD::Async->new(rpipe, $cb, cb_arg, $end_obj)
+ $self->{async} = $async->($self->{rpipe},
+ \&psgi_qx_init_cb, $self, $self);
+ # init_cb will call ->async_pass or ->close
+ } else { # generic PSGI
+ psgi_qx_init_cb($self) while $self->{qx_fh};
+ }
+}
+
# Similar to `backtick` or "qx" ("perldoc -f qx"), it calls $qx_cb with
# the stdout of the given command when done; but respects the given limiter
# $env is the PSGI env. As with ``/qx; only use this when output is small
$self->{qx_arg} = $qx_arg;
$self->{qx_fh} = $qx_fh;
$self->{qx_buf} = \$qx_buf;
- my $async = $env->{'pi-httpd.async'};
- my $cb = sub {
- my ($r, $buf);
-reread:
- $r = sysread($self->{rpipe}, $buf, 65536);
- if ($async) {
- $async->async_pass($env->{'psgix.io'}, $qx_fh, \$buf);
- } elsif (defined $r) {
- $r ? $qx_fh->write($buf) : event_step($self, undef);
- } else {
- return if $! == EAGAIN; # try again when notified
- goto reread if $! == EINTR;
- event_step($self, $!);
- }
- };
$limiter ||= $def_limiter ||= PublicInbox::Qspawn::Limiter->new(32);
- $self->start($limiter, sub { # start_cb, may run later, much later...
- if ($async) {
- # PublicInbox::HTTPD::Async->new(rpipe, $cb, $end_obj)
- $async = $async->($self->{rpipe}, $cb, undef, $self);
- # $cb will call ->async_pass or ->close
- } else { # generic PSGI
- $cb->() while $self->{qx_fh};
- }
- });
-}
-
-# create a filter for "push"-based streaming PSGI writes used by HTTPD::Async
-sub filter_fh ($$) {
- my ($fh, $filter) = @_;
- Plack::Util::inline_object(
- close => sub {
- $fh->write($filter->(undef));
- $fh->close;
- },
- write => sub {
- $fh->write($filter->($_[0]));
- });
+ start($self, $limiter, \&psgi_qx_start);
}
# this is called on pipe EOF to reap the process, may be called
my $ret;
my $total_rd = 0;
my $hdr_buf = $self->{hdr_buf};
+ my ($ph_cb, $ph_arg) = @{$self->{parse_hdr}};
do {
my $r = sysread($self->{rpipe}, $$hdr_buf, 4096,
length($$hdr_buf));
if (defined($r)) {
$total_rd += $r;
- $ret = $self->{parse_hdr}->($total_rd, $hdr_buf);
+ eval { $ret = $ph_cb->($total_rd, $hdr_buf, $ph_arg) };
+ if ($@) {
+ log_err($self->{psgi_env}, "parse_hdr: $@");
+ $ret = [ 500, [], [ "Internal error\n" ] ];
+ }
} else {
# caller should notify us when it's ready:
return if $! == EAGAIN;
} elsif ($async) {
# done reading headers, handoff to read body
my $fh = $wcb->($r); # scalar @$r == 2
- $fh = filter_fh($fh, $filter) if $filter;
+ $fh = $filter->attach($fh) if $filter;
$self->{fh} = $fh;
$async->async_pass($env->{'psgix.io'}, $fh,
delete($self->{hdr_buf}));
# psgi_return will return an anonymous
# sub for the PSGI server to call
#
-# $env->{'qspawn.filter'} - filter callback, receives a string as input,
-# undef on EOF
+# $env->{'qspawn.filter'} - filter object, responds to ->attach for
+# pi-httpd.async and ->translate for generic
+# PSGI servers
#
# $limiter - the Limiter object to use (uses the def_limiter if not given)
#
# psgix.io. 3-element arrays means the body is available
# immediately (or streamed via ->getline (pull-based)).
sub psgi_return {
- my ($self, $env, $limiter, $parse_hdr) = @_;
+ my ($self, $env, $limiter, $parse_hdr, $hdr_arg) = @_;
$self->{psgi_env} = $env;
$self->{hdr_buf} = \(my $hdr_buf = '');
- $self->{parse_hdr} = $parse_hdr;
+ $self->{parse_hdr} = [ $parse_hdr, $hdr_arg ];
$limiter ||= $def_limiter ||= PublicInbox::Qspawn::Limiter->new(32);
# the caller already captured the PSGI write callback from