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package FCGI::Client::Connection;
use strict;
use warnings;
use FCGI::Client::Constant;
use Time::HiRes qw(time);
use List::Util qw(max);
use POSIX qw(EAGAIN);
use FCGI::Client::Record;
use FCGI::Client::RecordFactory;
use Types::Standard qw/Int/;
use Moo;
has sock => (
is => 'ro',
required => 1,
);
has timeout => (
is => 'rw',
isa => Int,
default => 10,
);
no Moo;
sub request {
my ($self, $env, $content) = @_;
local $SIG{PIPE} = "IGNORE";
{
local $SIG{ALRM} = sub { Carp::confess('REQUEST_TIME_OUT') };
my $orig_alarm = alarm($self->timeout) || 0;
$self->_send_request($env, $content);
my @res = $self->_receive_response($self->sock);
alarm($orig_alarm);
return @res;
}
}
sub _receive_response {
my ($self, $sock) = @_;
my ($stdout, $stderr);
while (my $res = $self->_read_record($self)) {
my $type = $res->type;
if ($type == FCGI_STDOUT) {
$stdout .= $res->content;
} elsif ($type == FCGI_STDERR) {
$stderr .= $res->content;
} elsif ($type == FCGI_END_REQUEST) {
my $appstatus = unpack('N', $res->content);
$sock->close();
return ($stdout, $stderr, $appstatus);
} else {
die "unknown response type: " . $res->type;
}
}
die 'connection breaked from server process?';
}
sub _send_request {
my ($self, $env, $content) = @_;
my $reqid = 1;
$self->sock->print(FCGI::Client::RecordFactory->create_request($reqid, $env, $content));
}
sub _read_record {
my ($self) = @_;
my $header_raw = '';
while (length($header_raw) != FCGI_HEADER_LEN) {
$self->_read_timeout(\$header_raw, FCGI_HEADER_LEN-length($header_raw), length($header_raw)) or return;
}
my $header = FCGI::Client::RecordHeader->new(raw => $header_raw);
my $content_length = $header->content_length;
my $content = '';
if ($content_length != 0) {
while (length($content) != $content_length) {
$self->_read_timeout(\$content, $content_length-length($content), length($content)) or return;
}
}
my $padding_length = $header->padding_length;
my $padding = '';
if ($padding_length != 0) {
while (length($padding) != $padding_length) {
$self->_read_timeout(\$padding, $padding_length, 0) or return;
}
}
return FCGI::Client::Record->new(
header => $header,
content => $content,
);
}
# returns 1 if socket is ready, undef on timeout
sub _wait_socket {
my ( $self, $sock, $is_write, $wait_until ) = @_;
do {
my $vec = '';
vec( $vec, $sock->fileno, 1 ) = 1;
if (
select(
$is_write ? undef : $vec,
$is_write ? $vec : undef,
undef,
max( $wait_until - time, 0 )
) > 0
)
{
return 1;
}
} while ( time < $wait_until );
return;
}
# returns (positive) number of bytes read, or undef if the socket is to be closed
sub _read_timeout {
my ( $self, $buf, $len, $off, ) = @_;
my $sock = $self->sock;
my $timeout = $self->timeout;
my $wait_until = time + $timeout;
while ( $self->_wait_socket( $sock, undef, $wait_until ) ) {
if ( my $ret = $sock->sysread( $$buf, $len, $off ) ) {
return $ret;
}
elsif ( !( !defined($ret) && $! == EAGAIN ) ) {
last;
}
}
return;
}
1;
__END__
=head1 NAME
FCGI::Client::Connection - connection to FastCGI server
=head1 DESCRIPTION
This module handles connection to FastCGI server.
=head1 ATTRIBUTES
=over 4
=item sock
the socket object.
=item timeout
read only integer value, default is 10seconds.
=back
=head1 METHODS
=over 4
=item my ($stdout, $stderr, $appstatus) = $self->request($env, $content)
$env is environment hash, same as CGI.$content is request body string.
This method returns $stdout and $stderr strings.When error got, return undef.
$appstatus is the status code of FastCGI server, this is one of the following code.
#define FCGI_REQUEST_COMPLETE 0
#define FCGI_CANT_MPX_CONN 1
#define FCGI_OVERLOADED 2
#define FCGI_UNKNOWN_ROLE 3
These constants defined at L<FCGI::Client::Constat>.
=back
=head1 FAQ
=over 4
=item Why don't support FCGI_KEEP_CONN?
FCGI_KEEP_CONN is not used by lighttpd's mod_fastcgi.c, and mod_fast_cgi for apache.
And, FCGI.xs doesn't support it.
I seems FCGI_KEEP_CONN is not used in real world.
=back
|
