package Plack::Middleware::AccessLog::Timed;
use strict;
use warnings;
use parent qw( Plack::Middleware::AccessLog );

use Time::HiRes;
use Plack::Util;

sub call {
    my $self = shift;
    my($env) = @_;

    my $time = Time::HiRes::gettimeofday;
    my $length = 0;
    my $logger = $self->logger || sub { $env->{'psgi.errors'}->print(@_) };

    my $res = $self->app->($env);

    return $self->response_cb($res, sub {
        my $res = shift;
        my($status, $header, $body) = @$res;

        if (!defined $body) {
            $logger->( $self->log_line($status, $header, $env) );
            return;
        }

        my $getline = ref $body eq 'ARRAY' ? sub { shift @$body } : sub { $body->getline };

        my $timer_body = Plack::Util::inline_object(
            getline => sub {
                my $line = $getline->();
                $length += length $line if defined $line;
                return $line;
            },
            close => sub {
                $body->close if ref $body ne 'ARRAY';

                my $now = Time::HiRes::gettimeofday;
                $logger->( $self->log_line($status, $header, $env, { time => $now - $time, content_length => $length }) );
            },
        );

        @$res = ($status, $header, $timer_body);
    });
}

1;

__END__

=head1 NAME

Plack::Middleware::AccessLog::Timed - Logs requests with time and accurate body size

=head1 SYNOPSIS

  # in app.psgi
  use Plack::Builder;

  builder {
      enable "Plack::Middleware::AccessLog::Timed",
          format => "%v %h %l %u %t \"%r\" %>s %b %D";
      $app;
  };

=head1 DESCRIPTION

Plack::Middleware::AccessLog::Timed is a subclass of
Plack::Middleware::AccessLog but uses a wrapped body handle to get the
actual response body size C<%b> (even if it's not a chunk of array or
a real filehandle) and the time taken to serve the request: C<%T> or
C<%D>.

This wraps the response body output stream so some server
optimizations like sendfile(2) will be disabled if you use this
middleware.

=head1 CONFIGURATION

Same as L<Plack::Middleware::AccessLog>.

=head1 AUTHOR

Tatsuhiko Miyagawa

=head1 SEE ALSO

L<Plack::Middleware::AccessLog>

=cut
