From 93a7b219d58aad86438cbf3cbf4318a889831ac1 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Thu, 5 May 2022 10:52:15 +0000
Subject: public-inbox-netd: a multi-protocol superserver

Since we'll be adding POP3 support as our 4th network protocol;
asking admins to run yet another daemon on top of existing
-httpd, -nntpd, -imapd is a maintenance burden and a waste of
memory.

The goal of public-inbox-netd is to be able to replace all
existing read-only daemons with a single process to save memory
and reduce administrative overhead; hopefully encouraging more
users to self-host their own mirrors.

It's barely-tested at the moment.  Eventually, multiple
PI_CONFIG and HOME directories will be supported, as are
per-listener .psgi config files.
---
 lib/PublicInbox/HTTPD.pm | 48 ++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 40 insertions(+), 8 deletions(-)

(limited to 'lib/PublicInbox/HTTPD.pm')

diff --git a/lib/PublicInbox/HTTPD.pm b/lib/PublicInbox/HTTPD.pm
index 02f424c6..715e4538 100644
--- a/lib/PublicInbox/HTTPD.pm
+++ b/lib/PublicInbox/HTTPD.pm
@@ -1,14 +1,15 @@
-# Copyright (C) 2016-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 
 # wraps a listen socket for HTTP and links it to the PSGI app in
 # public-inbox-httpd
 package PublicInbox::HTTPD;
+use v5.10.1;
 use strict;
-use warnings;
-use Plack::Util;
+use Plack::Util ();
+use Plack::Builder;
+use PublicInbox::HTTP;
 use PublicInbox::HTTPD::Async;
-use PublicInbox::Daemon;
 
 sub pi_httpd_async { PublicInbox::HTTPD::Async->new(@_) }
 
@@ -41,10 +42,41 @@ sub new {
 		# detect when to use async paths for slow blobs
 		'pi-httpd.async' => \&pi_httpd_async
 	);
-	bless {
-		app => $app,
-		env => \%env
-	}, $class;
+	bless { app => $app, env => \%env }, $class;
+}
+
+my %httpds; # per-listen-FD mapping for HTTPD->{env}->{SERVER_<NAME|PORT>}
+my $default_app; # ugh...
+
+sub refresh {
+	if (@main::ARGV) {
+		eval { $default_app = Plack::Util::load_psgi(@ARGV) };
+		if ($@) {
+			die $@,
+"$0 runs in /, command-line paths must be absolute\n";
+		}
+	} else {
+		require PublicInbox::WWW;
+		my $www = PublicInbox::WWW->new;
+		$www->preload;
+		$default_app = builder {
+			eval { enable 'ReverseProxy' };
+			$@ and warn <<EOM;
+Plack::Middleware::ReverseProxy missing,
+URL generation for redirects may be wrong if behind a reverse proxy
+EOM
+			enable 'Head';
+			sub { $www->call(@_) };
+		};
+	}
+	%httpds = (); # invalidate cache
+}
+
+sub post_accept { # Listener->{post_accept}
+	my ($client, $addr, $srv) = @_; # $_[3] - tls_wrap (unused)
+	my $httpd = $httpds{fileno($srv)} //=
+				__PACKAGE__->new($srv, $default_app, $client);
+	PublicInbox::HTTP->new($client, $addr, $httpd),
 }
 
 1;
-- 
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