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=head1 NAME
Perlbal::Plugin::FlvStreaming - Enable FLV streaming with reverse proxy
=head1 DESCRIPTION
This plugin enable FLV streaming by modifying headers and prepending
FLV header to the body.
=head1 SYNOPSIS
LOAD FlvStreaming
CREATE SERVICE flv_proxy
SET role = reverse_proxy
SET plugins = FlvStreaming
ENABLE flv_proxy
=head1 LICENSE
This plugin is part of the Perlbal distribution, and as such can be
distributed under the same licence terms as the rest of Perlbal.
=cut
package Perlbal::Plugin::FlvStreaming;
use strict;
use warnings;
use URI;
use URI::QueryParam;
my $FLV_HEADER = 'FLV' . pack('CCNN', 1, 1, 9, 9);
sub load { }
sub register {
my ($class, $svc) = @_;
unless ($svc && $svc->{role} eq "reverse_proxy") {
die "You can't load the flvstreaming plugin on a service not of role reverse_proxy.\n";
}
$svc->register_hook('FlvStreaming', 'start_proxy_request', \&start_proxy_request);
$svc->register_hook('FlvStreaming', 'modify_response_headers', \&modify_response_headers);
$svc->register_hook('FlvStreaming', 'prepend_body', \&prepend_body);
return 1;
}
sub start_proxy_request {
my Perlbal::ClientProxy $client = shift;
my $uri = URI->new( $client->{req_headers}->{uri} );
my $path = $uri->path;
return 0 if $path !~ /\.flv$/;
my $start = $uri->query_param('start');
return 0 unless $start;
$client->{req_headers}->header('range', "bytes=$start-");
Perlbal::log('debug', "FlvStreaming: $uri") if Perlbal::DEBUG;
Perlbal::log('debug', "FlvStreaming: Add request header 'Range: bytes=$start-'") if Perlbal::DEBUG;
return 0;
}
sub modify_response_headers {
my Perlbal::BackendHTTP $be = shift;
my Perlbal::ClientProxy $client = shift;
my $headers = $client->{res_headers};
my $uri = URI->new( $client->{req_headers}->{uri} );
my $path = $uri->path;
return 0 if $path !~ /\.flv$/;
my $start = $uri->query_param('start');
return 0 unless $start;
$headers->{responseLine} = 'HTTP/1.0 200 OK';
$headers->{code} = '200';
delete $headers->{headers}->{'accept-ranges'};
delete $headers->{headers}->{'content-range'};
$headers->{headers}->{'content-type'} = 'video/x-flv';
$headers->{headers}->{'content-length'} += length $FLV_HEADER;
return 0;
}
sub prepend_body {
my Perlbal::BackendHTTP $be = shift;
my Perlbal::ClientProxy $client = shift;
my $uri = URI->new( $client->{req_headers}->{uri} );
my $path = $uri->path;
return 0 if $path !~ /\.flv$/;
my $start = $uri->query_param('start');
return 0 unless $start;
$client->write($FLV_HEADER);
return 0;
}
1;
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