NAME

"Net::Async::FastCGI" - use FastCGI with IO::Async

SYNOPSIS

As an adapter:

 use Net::Async::FastCGI;
 use IO::Async::Loop;
 my $loop = IO::Async::Loop->new();
 my $fastcgi = Net::Async::FastCGI->new(
    on_request => sub {
       my ( $fastcgi, $req ) = @_;
       # Handle the request here
    }
 );
 $loop->add( $fastcgi );
 $fastcgi->listen(
    service => 1234,
    on_resolve_error => sub { die "Cannot resolve - $_[-1]\n" },
    on_listen_error  => sub { die "Cannot listen - $_[-1]\n" },
 );
 $loop->run;

As a subclass:

 package MyFastCGIResponder;
 use base qw( Net::Async::FastCGI );
 sub on_request
 {
    my $self = shift;
    my ( $req ) = @_;
    # Handle the request here
 }
 ...
 use IO::Async::Loop;
 my $loop = IO::Async::Loop->new();
 my $fastcgi;
 $loop->add( $fastcgi = MyFastCGIResponder->new( service => 1234 ) );
 $fastcgi->listen(
    service => 1234,
    on_resolve_error => sub { die "Cannot resolve - $_[-1]\n" },
    on_listen_error  => sub { die "Cannot listen - $_[-1]\n" },
 );
 $loop->run;

DESCRIPTION

This module allows a program to respond asynchronously to FastCGI requests, as part of a program based on IO::Async. An object in this class represents a single FastCGI responder that the webserver is configured to communicate with. It can handle multiple outstanding requests at a time, responding to each as data is provided by the program. Individual outstanding requests that have been started but not yet finished, are represented by instances of Net::Async::FastCGI::Request.

EVENTS

The following events are invoked, either using subclass methods or CODE references in parameters:

on_request $req

Invoked when a new FastCGI request is received. It will be passed a new Net::Async::FastCGI::Request object.

PARAMETERS

The following named parameters may be passed to "new" or "configure":

on_request => CODE: CODE references for "on_request" event handler.
default_encoding => STRING: Sets the default encoding used by all new requests. If not supplied then "UTF-8" will apply.

METHODS

$fcgi->listen( %args )

Start listening for connections on a socket, creating it first if necessary.

This method may be called in either of the following ways. To listen on an existing socket filehandle:

handle => IO: An IO handle referring to a listen-mode socket. This is now deprecated; use the "handle" key to the "new" or "configure" methods instead.

Or, to create the listening socket or sockets:

service => STRING: Port number or service name to listen on.
host => STRING: Optional. If supplied, the hostname will be resolved into a set of addresses, and one listening socket will be created for each address. If not, then all available addresses will be used.

This method may also require "on_listen_error" or "on_resolve_error" callbacks for error handling - see IO::Async::Listener for more detail.

Limits in FCGI_GET_VALUES

The "FCGI_GET_VALUES" FastCGI request can enquire of the responder the maximum number of connections or requests it can support. Because this module puts no fundamental limit on these values, it will return some arbitrary numbers. These are given in package variables:

 $Net::Async::FastCGI::MAX_CONNS = 1024;
 $Net::Async::FastCGI::MAX_REQS  = 1024;

These variables are provided in case the containing application wishes to make the library return different values in the request. These values are not actually used by the library, other than to fill in the values in response of "FCGI_GET_VALUES".

Using a socket on STDIN

When running a local FastCGI responder, the webserver will create a new INET socket connected to the script's STDIN file handle. To use the socket in this case, it should be passed as the "handle" argument.

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>

2022-12-10

perl v5.36.0