Provided by: libpoe-component-server-simplehttp-perl_2.20-1_all 
NAME
POE::Component::Server::SimpleHTTP - Perl extension to serve HTTP requests in POE.
SYNOPSIS
use POE;
use POE::Component::Server::SimpleHTTP;
# Start the server!
POE::Component::Server::SimpleHTTP->new(
'ALIAS' => 'HTTPD',
'PORT' => 11111,
'HOSTNAME' => 'MySite.com',
'HANDLERS' => [
{
'DIR' => '^/bar/.*',
'SESSION' => 'HTTP_GET',
'EVENT' => 'GOT_BAR',
},
{
'DIR' => '^/$',
'SESSION' => 'HTTP_GET',
'EVENT' => 'GOT_MAIN',
},
{
'DIR' => '^/foo/.*',
'SESSION' => 'HTTP_GET',
'EVENT' => 'GOT_NULL',
},
{
'DIR' => '.*',
'SESSION' => 'HTTP_GET',
'EVENT' => 'GOT_ERROR',
},
],
'LOGHANDLER' => { 'SESSION' => 'HTTP_GET',
'EVENT' => 'GOT_LOG',
},
'LOG2HANDLER' => { 'SESSION' => 'HTTP_GET',
'EVENT' => 'POSTLOG',
},
# In the testing phase...
'SSLKEYCERT' => [ 'private-key.pem', 'public-cert.pem' ],
'SSLINTERMEDIATECACERT' => 'intermediate-ca-cert.pem',
) or die 'Unable to create the HTTP Server';
# Create our own session to receive events from SimpleHTTP
POE::Session->create(
inline_states => {
'_start' => sub { $_[KERNEL]->alias_set( 'HTTP_GET' );
$_[KERNEL]->post( 'HTTPD', 'GETHANDLERS', $_[SESSION], 'GOT_HANDLERS' );
},
'GOT_BAR' => \&GOT_REQ,
'GOT_MAIN' => \&GOT_REQ,
'GOT_ERROR' => \&GOT_ERR,
'GOT_NULL' => \&GOT_NULL,
'GOT_HANDLERS' => \&GOT_HANDLERS,
'GOT_LOG' => \&GOT_LOG,
},
);
# Start POE!
POE::Kernel->run();
sub GOT_HANDLERS {
# ARG0 = HANDLERS array
my $handlers = $_[ ARG0 ];
# Move the first handler to the last one
push( @$handlers, shift( @$handlers ) );
# Send it off!
$_[KERNEL]->post( 'HTTPD', 'SETHANDLERS', $handlers );
}
sub GOT_NULL {
# ARG0 = HTTP::Request object, ARG1 = HTTP::Response object, ARG2 = the DIR that matched
my( $request, $response, $dirmatch ) = @_[ ARG0 .. ARG2 ];
# Kill this!
$_[KERNEL]->post( 'HTTPD', 'CLOSE', $response );
}
sub GOT_REQ {
# ARG0 = HTTP::Request object, ARG1 = HTTP::Response object, ARG2 = the DIR that matched
my( $request, $response, $dirmatch ) = @_[ ARG0 .. ARG2 ];
# Do our stuff to HTTP::Response
$response->code( 200 );
$response->content( 'Some funky HTML here' );
# We are done!
# For speed, you could use $_[KERNEL]->call( ... )
$_[KERNEL]->post( 'HTTPD', 'DONE', $response );
}
sub GOT_ERR {
# ARG0 = HTTP::Request object, ARG1 = HTTP::Response object, ARG2 = the DIR that matched
my( $request, $response, $dirmatch ) = @_[ ARG0 .. ARG2 ];
# Check for errors
if ( ! defined $request ) {
$_[KERNEL]->post( 'HTTPD', 'DONE', $response );
return;
}
# Do our stuff to HTTP::Response
$response->code( 404 );
$response->content( "Hi visitor from " . $response->connection->remote_ip . ", Page not found -> '" . $request->uri->path . "'" );
# We are done!
# For speed, you could use $_[KERNEL]->call( ... )
$_[KERNEL]->post( 'HTTPD', 'DONE', $response );
}
sub GOT_LOG {
# ARG0 = HTTP::Request object, ARG1 = remote IP
my ($request, $remote_ip) = @_[ARG0,ARG1];
# Do some sort of logging activity.
# If the request was malformed, $request = undef
# CHECK FOR A REQUEST OBJECT BEFORE USING IT.
if( $request ) {
{
warn join(' ', time(), $remote_ip, $request->uri ), "\n";
} else {
warn join(' ', time(), $remote_ip, 'Bad request' ), "\n";
}
return;
}
ABSTRACT
An easy to use HTTP daemon for POE-enabled programs
DESCRIPTION
This module makes serving up HTTP requests a breeze in POE.
The hardest thing to understand in this module is the HANDLERS. That's it!
The standard way to use this module is to do this:
use POE;
use POE::Component::Server::SimpleHTTP;
POE::Component::Server::SimpleHTTP->new( ... );
POE::Session->create( ... );
POE::Kernel->run();
Starting SimpleHTTP
To start SimpleHTTP, just call it's new method:
POE::Component::Server::SimpleHTTP->new(
'ALIAS' => 'HTTPD',
'ADDRESS' => '192.168.1.1',
'PORT' => 11111,
'HOSTNAME' => 'MySite.com',
'HEADERS' => {},
'HANDLERS' => [ ],
);
This method will die on error or return success.
This constructor accepts only 7 options.
"ALIAS"
This will set the alias SimpleHTTP uses in the POE Kernel. This will default to
"SimpleHTTP"
"ADDRESS"
This value will be passed to POE::Wheel::SocketFactory to bind to, will use INADDR_ANY
if it is nothing is provided.
"PORT"
This value will be passed to POE::Wheel::SocketFactory to bind to.
"HOSTNAME"
This value is for the HTTP::Request's URI to point to. If this is not supplied,
SimpleHTTP will use Sys::Hostname to find it.
"HEADERS"
This should be a hashref, that will become the default headers on all HTTP::Response
objects. You can override this in individual requests by setting it via
$request->header( ... )
For more information, consult the HTTP::Headers module.
"HANDLERS"
This is the hardest part of SimpleHTTP :)
You supply an array, with each element being a hash. All the hashes should contain
those 3 keys:
DIR -> The regexp that will be used, more later.
SESSION -> The session to send the input
EVENT -> The event to trigger
The DIR key should be a valid regexp. This will be matched against the current request
path. Pseudocode is: if ( $path =~ /$DIR/ )
NOTE: The path is UNIX style, not MSWIN style ( /blah/foo not \blah\foo )
Now, if you supply 100 handlers, how will SimpleHTTP know what to do? Simple! By
passing in an array in the first place, you have already told SimpleHTTP the order of
your handlers. They will be tried in order, and if a match is not found, SimpleHTTP
will return a 404 response.
This allows some cool things like specifying 3 handlers with DIR of: '^/foo/.*',
'^/$', '.*'
Now, if the request is not in /foo or not root, your 3rd handler will catch it,
becoming the "404 not found" handler!
NOTE: You might get weird Session/Events, make sure your handlers are in order, for
example: '^/', '^/foo/.*' The 2nd handler will NEVER get any requests, as the first
one will match ( no $ in the regex )
Now, here's what a handler receives:
ARG0 -> HTTP::Request object
ARG1 -> POE::Component::Server::SimpleHTTP::Response object
ARG2 -> The exact DIR that matched, so you can see what triggered what
NOTE: If ARG0 is undef, that means POE::Filter::HTTPD encountered an error parsing the
client request, simply modify the HTTP::Response object and send some sort of generic
error. SimpleHTTP will set the path used in matching the DIR regexes to an empty
string, so if there is a "catch-all" DIR regex like '.*', it will catch the errors,
and only that one.
NOTE: The only way SimpleHTTP will leak memory ( hopefully heh ) is if you discard the
SimpleHTTP::Response object without sending it back to SimpleHTTP via the DONE/CLOSE
events, so never do that!
"KEEPALIVE"
Set to true to enable HTTP keep-alive support. Connections will be kept alive until
the client closes the connection. All HTTP/1.1 connections are kept-open, unless you
set the response "Connection" header to "close".
$response->header( Connection => 'close' );
If you want more control, use POE::Component::Server::HTTP::KeepAlive.
"LOGHANDLER"
Expects a hashref with the following key, values:
SESSION -> The session to send the input
EVENT -> The event to trigger
You will receive an event for each request to the server from clients. Malformed
client requests will not be passed into the handler. Instead undef will be passed.
Event is called before ANY content handler is called.
The event will have the following parameters:
ARG0 -> HTTP::Request object/undef if client request was malformed.
ARG1 -> the IP address of the client
"LOG2HANDLER"
Expect a hashref with the following key, values:
SESSION -> The session to send the input
EVENT -> The event to trigger
You will receive an event for each response that hit DONE call. Malformed client
requests will not be passed into the handler. Event is after processing all content
handlers.
The event will have the following parameters:
ARG0 -> HTTP::Request object
ARG1 -> HTTP::Response object
That makes possible following code:
my ($login, $password) = $request->authorization_basic();
printf STDERR "%s - %s [%s] \"%s %s %s\" %d %d\n",
$response->connection->remote_ip, $login||'-', POSIX::strftime("%d/%b/%Y:%T %z",localtime(time())),
$request->method(), $request->uri()->path(), $request->protocol(),
$response->code(), length($response->content());
Emulate apache-like logs for PoCo::Server::SimpleHTTP
"SETUPHANDLER"
Expects a hashref with the following key, values:
SESSION -> The session to send the input
EVENT -> The event to trigger
You will receive an event when the listener wheel has been setup.
Currently there are no parameters returned.
"SSLKEYCERT"
This should be an arrayref of only 2 elements - the private key and public certificate
locations. Now, this is still in the experimental stage, and testing is greatly
welcome!
Again, this will automatically turn every incoming connection into a SSL socket. Once
enough testing has been done, this option will be augmented with more SSL stuff!
"SSLINTERMEDIATECACERT"
This option is needed in case the SSL certificate references an intermediate
certification authority certificate.
"PROXYMODE"
Set this to a true value to enable the server to act as a proxy server, ie. it won't
mangle the HTTP::Request URI.
Events
SimpleHTTP is so simple, there are only 8 events available.
"DONE"
This event accepts only one argument: the HTTP::Response object we sent to the handler.
Calling this event implies that this particular request is done, and will proceed to close the socket.
NOTE: This method automatically sets those 3 headers if they are not already set:
Date -> Current date stringified via HTTP::Date->time2str
Content-Type -> text/html
Content-Length -> length( $response->content )
To get greater throughput and response time, do not post() to the DONE event, call() it!
However, this will force your program to block while servicing web requests...
"CLOSE"
This event accepts only one argument: the HTTP::Response object we sent to the handler.
Calling this event will close the socket, not sending any output
"GETHANDLERS"
This event accepts 2 arguments: The session + event to send the response to
This event will send back the current HANDLERS array ( deep-cloned via Storable::dclone )
The resulting array can be played around to your tastes, then once you are done...
"SETHANDLERS"
This event accepts only one argument: pointer to HANDLERS array
BEWARE: if there is an error in the HANDLERS, SimpleHTTP will die!
"SETCLOSEHANDLER"
$_[KERNEL]->call( $_[SENDER], 'SETCLOSEHANDLER', $connection,
$event, @args );
Calls $event in the current session when $connection is closed. You could use for
persistent connection handling.
Multiple session may register close handlers.
Calling SETCLOSEHANDLER without $event to remove the current session's handler:
$_[KERNEL]->call( $_[SENDER], 'SETCLOSEHANDLER', $connection );
You must make sure that @args doesn't cause a circular reference. Ideally, use
"$connection-"ID> or some other unique value associated with this $connection.
"STARTLISTEN"
Starts the listening socket, if it was shut down
"STOPLISTEN"
Simply a wrapper for SHUTDOWN GRACEFUL, but will not shutdown SimpleHTTP if there is no more requests
"SHUTDOWN"
Without arguments, SimpleHTTP does this:
Close the listening socket
Kills all pending requests by closing their sockets
Removes it's alias
With an argument of 'GRACEFUL', SimpleHTTP does this:
Close the listening socket
Waits for all pending requests to come in via DONE/CLOSE, then removes it's alias
"STREAM"
With a $response argument it streams the content and calls back the streaming event
of the user's session (or with the dont_flush option you're responsible for calling
back your session's streaming event).
To use the streaming feature see below.
Streaming with SimpleHTTP
It's possible to send data as a stream to clients (unbuffered and integrated in the POE
loop).
Just create your session to receive events from SimpleHTTP as usually and add a streaming
event, this event will be triggered over and over each time you set the $response to a
streaming state and once you trigger it:
# sets the response as streamed within our session which alias is HTTP_GET
# with the event GOT_STREAM
$response->stream(
session => 'HTTP_GET',
event => 'GOT_STREAM',
dont_flush => 1
);
# then you can simply yield your streaming event, once the GOT_STREAM event
# has reached its end it will be triggered again and again, until you
# send a CLOSE event to the kernel with the appropriate response as parameter
$kernel->yield('GOT_STREAM', $response);
The optional dont_flush option gives the user the ability to control the callback to the
streaming event, which means once your stream event has reached its end it won't be
called, you have to call it back.
You can now send data by chunks and either call yourself back (via POE) or shutdown when
your streaming is done (EOF for example).
sub GOT_STREAM {
my ( $kernel, $heap, $response ) = @_[KERNEL, HEAP, ARG0];
# sets the content of the response
$response->content("Hello World\n");
# send it to the client
POE::Kernel->post('HTTPD', 'STREAM', $response);
# if we have previously set the dont_flush option
# we have to trigger our event back until the end of
# the stream like this (that can be a yield, of course):
#
# $kernel->delay('GOT_STREAM', 1, $stream );
# otherwise the GOT_STREAM event is triggered continuously until
# we call the CLOSE event on the response like that :
#
if ($heap{'streaming_is_done'}) {
# close the socket and end the stream
POE::Kernel->post('HTTPD', 'CLOSE', $response );
}
}
The dont_flush option is there to be able to control the frequency of flushes to the
client.
SimpleHTTP Notes
You can enable debugging mode by doing this:
sub POE::Component::Server::SimpleHTTP::DEBUG () { 1 }
use POE::Component::Server::SimpleHTTP;
Also, this module will try to keep the Listening socket alive. if it dies, it will open
it again for a max of 5 retries.
You can override this behavior by doing this:
sub POE::Component::Server::SimpleHTTP::MAX_RETRIES () { 10 }
use POE::Component::Server::SimpleHTTP;
For those who are pondering about basic-authentication, here's a tiny snippet to put in
the Event handler
# Contributed by Rocco Caputo
sub Got_Request {
# ARG0 = HTTP::Request, ARG1 = HTTP::Response
my( $request, $response ) = @_[ ARG0, ARG1 ];
# Get the login
my ( $login, $password ) = $request->authorization_basic();
# Decide what to do
if ( ! defined $login or ! defined $password ) {
# Set the authorization
$response->header( 'WWW-Authenticate' => 'Basic realm="MyRealm"' );
$response->code( 401 );
$response->content( 'FORBIDDEN.' );
# Send it off!
$_[KERNEL]->post( 'SimpleHTTP', 'DONE', $response );
} else {
# Authenticate the user and move on
}
}
EXPORT
Nothing.
SEE ALSO
L<POE>
L<POE::Filter::HTTPD>
L<HTTP::Request>
L<HTTP::Response>
L<POE::Component::Server::SimpleHTTP::Connection>
L<POE::Component::Server::SimpleHTTP::Response>
L<POE::Component::Server::SimpleHTTP::PreFork>
L<POE::Component::SSLify>
AUTHOR
Apocalypse <apocal@cpan.org>
COPYRIGHT AND LICENSE
Copyright 2006 by Apocalypse
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.