user/dev discussion of public-inbox itself
 help / color / mirror / code / Atom feed
From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH 09/30] qspawn: psgi_return: initial cb can be named
Date: Wed, 25 Dec 2019 07:50:43 +0000	[thread overview]
Message-ID: <20191225075104.22184-10-e@80x24.org> (raw)
In-Reply-To: <20191225075104.22184-1-e@80x24.org>

We can take advantage of HTTPD::Async being able to pass
user-supplied args to callbacks to get rid of one (of many)
anonymous subs in the code path.
---
 lib/PublicInbox/Qspawn.pm | 83 ++++++++++++++++++++-------------------
 1 file changed, 43 insertions(+), 40 deletions(-)

diff --git a/lib/PublicInbox/Qspawn.pm b/lib/PublicInbox/Qspawn.pm
index 1985dccd..0967bcfa 100644
--- a/lib/PublicInbox/Qspawn.pm
+++ b/lib/PublicInbox/Qspawn.pm
@@ -239,6 +239,42 @@ sub rd_hdr ($) {
 	$ret;
 }
 
+sub psgi_return_init_cb {
+	my ($self) = @_;
+	my $r = rd_hdr($self) or return;
+	my $env = $self->{psgi_env};
+	my $filter = delete $env->{'qspawn.filter'};
+	my $wcb = delete $env->{'qspawn.wcb'};
+	my $async = delete $self->{async};
+	if (scalar(@$r) == 3) { # error
+		if ($async) {
+			# calls rpipe->close && ->event_step
+			$async->close;
+		} else {
+			$self->{rpipe}->close;
+			event_step($self);
+		}
+		$wcb->($r);
+	} elsif ($async) {
+		# done reading headers, handoff to read body
+		my $fh = $wcb->($r); # scalar @$r == 2
+		$fh = filter_fh($fh, $filter) if $filter;
+		$self->{fh} = $fh;
+		$async->async_pass($env->{'psgix.io'}, $fh,
+					delete($self->{hdr_buf}));
+	} else { # for synchronous PSGI servers
+		require PublicInbox::GetlineBody;
+		$r->[2] = PublicInbox::GetlineBody->new($self->{rpipe},
+					\&event_step, $self,
+					${$self->{hdr_buf}}, $filter);
+		$wcb->($r);
+	}
+
+	# Workaround a leak under Perl 5.16.3 when combined with
+	# Plack::Middleware::Deflater:
+	$wcb = undef;
+}
+
 # Used for streaming the stdout of one process as a PSGI response.
 #
 # $env is the PSGI env.
@@ -266,62 +302,29 @@ sub psgi_return {
 	$self->{psgi_env} = $env;
 	$self->{hdr_buf} = \(my $hdr_buf = '');
 	$self->{parse_hdr} = $parse_hdr;
-	my $wcb = delete $env->{'qspawn.wcb'}; # or PSGI server supplies it
-	my $async = $env->{'pi-httpd.async'};
-
-	my $cb = sub {
-		my $r = rd_hdr($self) or return;
-		my $filter = delete $env->{'qspawn.filter'};
-		if (scalar(@$r) == 3) { # error
-			if ($async) {
-				# calls rpipe->close && ->event_step
-				$async->close;
-			} else {
-				$self->{rpipe}->close;
-				event_step($self);
-			}
-			$wcb->($r);
-		} elsif ($async) {
-			# done reading headers, handoff to read body
-			my $fh = $wcb->($r); # scalar @$r == 2
-			$fh = filter_fh($fh, $filter) if $filter;
-			$self->{fh} = $fh;
-			$async->async_pass($env->{'psgix.io'}, $fh,
-						delete($self->{hdr_buf}));
-		} else { # for synchronous PSGI servers
-			require PublicInbox::GetlineBody;
-			$r->[2] = PublicInbox::GetlineBody->new($self->{rpipe},
-						\&event_step, $self,
-						${$self->{hdr_buf}}, $filter);
-			$wcb->($r);
-		}
-
-		# Workaround a leak under Perl 5.16.3 when combined with
-		# Plack::Middleware::Deflater:
-		$wcb = undef;
-	};
 	$limiter ||= $def_limiter ||= PublicInbox::Qspawn::Limiter->new(32);
 	my $start_cb = sub { # may run later, much later...
-		if ($async) {
+		if (my $async = $env->{'pi-httpd.async'}) {
 			# PublicInbox::HTTPD::Async->new(rpipe, $cb, $cb_arg,
 			#				 $end_obj)
-			$async = $async->($self->{rpipe}, $cb, undef, $self);
-			# $cb will call ->async_pass or ->close
+			$self->{async} = $async->($self->{rpipe},
+						\&psgi_return_init_cb, $self,
+						$self);
 		} else { # generic PSGI
-			$cb->() while $self->{parse_hdr};
+			psgi_return_init_cb($self) while $self->{parse_hdr};
 		}
 	};
 
 	# the caller already captured the PSGI write callback from
 	# the PSGI server, so we can call ->start, here:
-	return $self->start($limiter, $start_cb) if $wcb;
+	return $self->start($limiter, $start_cb) if $env->{'qspawn.wcb'};
 
 	# the caller will return this sub to the PSGI server, so
 	# it can set the response callback (that is, for PublicInbox::HTTP,
 	# the chunked_wcb or identity_wcb callback), but other HTTP servers
 	# are supported:
 	sub {
-		($wcb) = @_;
+		$self->{psgi_env}->{'qspawn.wcb'} = $_[0];
 		$self->start($limiter, $start_cb);
 	};
 }

  parent reply	other threads:[~2019-12-25  7:51 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-25  7:50 [PATCH 00/30] www: eliminate most per-request closures Eric Wong
2019-12-25  7:50 ` [PATCH 01/30] git: allow async_cat to pass arg to callback Eric Wong
2019-12-25  7:50 ` [PATCH 02/30] httpd/async: support passing arg to callbacks Eric Wong
2019-12-26  7:53   ` Eric Wong
2019-12-25  7:50 ` [PATCH 03/30] qspawn: remove some anonymous subs for psgi_qx Eric Wong
2019-12-25  7:50 ` [PATCH 04/30] qspawn: disambiguate command vs PSGI env Eric Wong
2019-12-25  7:50 ` [PATCH 05/30] qspawn: replace anonymous $end callbacks w/ event_step Eric Wong
2019-12-25  7:50 ` [PATCH 06/30] msg_iter: provide means to stop using anonymous subs Eric Wong
2019-12-25  7:50 ` [PATCH 07/30] qspawn: reduce local vars, de-anonymize rd_hdr Eric Wong
2019-12-25  7:50 ` [PATCH 08/30] httpd/async: get rid of ephemeral main_cb Eric Wong
2019-12-25  7:50 ` Eric Wong [this message]
2019-12-25  7:50 ` [PATCH 10/30] qspawn: psgi_return_start: hoist out from psgi_return Eric Wong
2019-12-25  7:50 ` [PATCH 11/30] qspawn: psgi_qx: eliminate anonymous subs Eric Wong
2019-12-25  7:50 ` [PATCH 12/30] qspawn: drop "qspawn.filter" support, for now Eric Wong
2019-12-25  7:50 ` [PATCH 13/30] qspawn: psgi_return: allow non-anon parse_hdr callback Eric Wong
2019-12-25  7:50 ` [PATCH 14/30] githttpbackend: split out wwwstatic Eric Wong
2019-12-26 12:50   ` Eric Wong
2019-12-27 10:36     ` Eric Wong
2019-12-25  7:50 ` [PATCH 15/30] www: lazy load Plack::Util Eric Wong
2019-12-25  7:50 ` [PATCH 16/30] mboxgz: pass $ctx to callback to avoid anon subs Eric Wong
2019-12-25  7:50 ` [PATCH 17/30] feed: avoid anonymous subs Eric Wong
2019-12-25  7:50 ` [PATCH 18/30] config: each_inbox: pass user arg to callback Eric Wong
2019-12-26  6:48   ` Eric Wong
2019-12-25  7:50 ` [PATCH 19/30] view: avoid anon sub in stream_thread Eric Wong
2019-12-25  7:50 ` [PATCH 20/30] view: msg_html: stop using an anonymous sub Eric Wong
2019-12-25  7:50 ` [PATCH 21/30] contentid: no " Eric Wong
2019-12-25  7:50 ` [PATCH 22/30] wwwtext: avoid anonymous sub in response Eric Wong
2019-12-25  7:50 ` [PATCH 23/30] searchview: pass named subs to Www*Stream Eric Wong
2019-12-25  7:50 ` [PATCH 24/30] view: thread_html: pass named sub to WwwStream Eric Wong
2019-12-25  7:50 ` [PATCH 25/30] searchview: remove anonymous sub when sorting threads by relevance Eric Wong
2019-12-25  7:51 ` [PATCH 26/30] view: msg_iter calls add_body_text directly Eric Wong
2019-12-25  7:51 ` [PATCH 27/30] wwwattach: avoid anonymous sub for msg_iter Eric Wong
2019-12-25  7:51 ` [PATCH 28/30] viewvcs: avoid anonymous sub for HTML response Eric Wong
2019-12-25  7:51 ` [PATCH 29/30] solvergit: allow passing arg to user-supplied callback Eric Wong
2019-12-28  9:17   ` Eric Wong
2019-12-25  7:51 ` [PATCH 30/30] search: retry_reopen passes user arg to callback Eric Wong

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: http://public-inbox.org/README

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20191225075104.22184-10-e@80x24.org \
    --to=e@80x24.org \
    --cc=meta@public-inbox.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
Code repositories for project(s) associated with this public inbox

	https://80x24.org/public-inbox.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).