From b490ce09b370d9398d5332ca1dc6260a7ec0aa6c Mon Sep 17 00:00:00 2001 From: Eric Wong Date: Wed, 11 Jan 2017 04:12:26 +0000 Subject: qspawn|getlinebody: support streaming filters This is intended for wrapping "git show" and "git diff" processes in the future and to prevent it from monopolizing callers. This will us to better handle backpressure from gigantic commits. --- lib/PublicInbox/GetlineBody.pm | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'lib/PublicInbox/GetlineBody.pm') diff --git a/lib/PublicInbox/GetlineBody.pm b/lib/PublicInbox/GetlineBody.pm index ea07f3d6..0a922fd2 100644 --- a/lib/PublicInbox/GetlineBody.pm +++ b/lib/PublicInbox/GetlineBody.pm @@ -13,8 +13,13 @@ use strict; use warnings; sub new { - my ($class, $rpipe, $end, $buf) = @_; - bless { rpipe => $rpipe, end => $end, buf => $buf }, $class; + my ($class, $rpipe, $end, $buf, $filter) = @_; + bless { + rpipe => $rpipe, + end => $end, + buf => $buf, + filter => $filter || 0, + }, $class; } # close should always be called after getline returns undef, @@ -24,8 +29,13 @@ sub DESTROY { $_[0]->close } sub getline { my ($self) = @_; + my $filter = $self->{filter}; + return if $filter == -1; # last call was EOF + my $buf = delete $self->{buf}; # initial buffer - defined $buf ? $buf : $self->{rpipe}->getline; + $buf = $self->{rpipe}->getline unless defined $buf; + $self->{filter} = -1 unless defined $buf; # set EOF for next call + $filter ? $filter->($buf) : $buf; } sub close { -- cgit v1.2.3-24-ge0c7