POE-Component-Server-SimpleHTTP
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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.
ABSTRACT
An easy to use HTTP daemon for POE-enabled programs
SEE ALSO
L<POE>
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