NAME
POE::Component::Server::SOAP - publish POE event handlers via SOAP over
HTTP
SYNOPSIS
use POE;
use POE::Component::Server::SOAP;
POE::Component::Server::SOAP->new(
'ALIAS' => 'MySOAP',
'ADDRESS' => 'localhost',
'PORT' => 32080,
'HOSTNAME' => 'MyHost.com',
);
POE::Session->create(
'inline_states' => {
'_start' => \&setup_service,
'_stop' => \&shutdown_service,
'Sum_Things' => \&do_sum,
},
);
$poe_kernel->run;
exit 0;
sub setup_service {
my $kernel = $_[KERNEL];
$kernel->alias_set( 'MyServer' );
$kernel->post( 'MySOAP', 'ADDMETHOD', 'MyServer', 'Sum_Things' );
}
sub shutdown_service {
$_[KERNEL]->post( 'MySOAP', 'DELMETHOD', 'MyServer', 'Sum_Things' );
}
sub do_sum {
my $response = $_[ARG0];
my $params = $response->soapbody;
my $sum = 0;
while (my ($field, $value) = each(%$params)) {
$sum += $value;
}
# Fake an error
if ( $sum < 100 ) {
$_[KERNEL]->post( 'MySOAP', 'FAULT', $response, 'Client.Add.Error', 'The sum must be above 100' );
} else {
# Add the content
$response->content( "Thanks. Sum is: $sum" );
$_[KERNEL]->post( 'MySOAP', 'DONE', $response );
}
}
ABSTRACT
An easy to use SOAP/1.1 daemon for POE-enabled programs
DESCRIPTION
This module makes serving SOAP/1.1 requests a breeze in POE.
The hardest thing to understand in this module is the SOAP Body. That's
it!
The standard way to use this module is to do this:
use POE;
use POE::Component::Server::SOAP;
POE::Component::Server::SOAP->new( ... );
POE::Session->create( ... );
POE::Kernel->run();
POE::Component::Server::SOAP is a bolt-on component that can publish
event handlers via SOAP over HTTP. Currently, this module only supports
SOAP/1.1 requests, work will be done in the future to support SOAP/1.2
requests. The HTTP server is done via
POE::Component::Server::SimpleHTTP.
Starting Server::SOAP
To start Server::SOAP, just call it's new method:
POE::Component::Server::SOAP->new(
'ALIAS' => 'MySOAP',
'ADDRESS' => '192.168.1.1',
'PORT' => 11111,
'HOSTNAME' => 'MySite.com',
'HEADERS' => {},
);
This method will die on error or return success.
This constructor accepts only 7 options.
"ALIAS"
This will set the alias Server::SOAP uses in the POE Kernel. This
will default to "SOAPServer"
"ADDRESS"
This value will be passed to POE::Component::Server::SimpleHTTP to
bind to.
Examples: ADDRESS => 0 # Bind to all addresses + localhost ADDRESS
=> 'localhost' # Bind to localhost ADDRESS => '192.168.1.1' # Bind
to specified IP
"PORT"
This value will be passed to POE::Component::Server::SimpleHTTP to
bind to.
"HOSTNAME"
This value is for the HTTP::Request's URI to point to. If this is
not supplied, POE::Component::Server::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 $response->header( ... )
The default header is: Server => 'POE::Component::Server::SOAP/' .
$VERSION
For more information, consult the HTTP::Headers module.
"MUSTUNDERSTAND"
This is a boolean value, controlling whether Server::SOAP will check
for this value in the Headers and Fault if it is present. This will
default to true.
"SIMPLEHTTP"
This allows you to pass options to the SimpleHTTP backend. One of
the real reasons is to support SSL in Server::SOAP, yay! To learn
how to use SSL, please consult the
POE::Component::Server::SimpleHTTP documentation. Of course, you
could totally screw up things, just use this with caution :)
You must pass a hash reference as the value, because it will be
expanded and put in the Server::SimpleHTTP->new() constructor.
Events
There are only a few ways to communicate with Server::SOAP.
"ADDMETHOD"
This event accepts four arguments:
- The intended session alias
- The intended session event
- The public service name ( not required -> defaults to session alias )
- The public method name ( not required -> defaults to session event )
Calling this event will add the method to the registry.
NOTE: This will overwrite the old definition of a method if it exists!
"DELMETHOD"
This event accepts two arguments:
- The service name
- The method name
Calling this event will remove the method from the registry.
NOTE: if the service now contains no methods, it will also be removed.
"DELSERVICE"
This event accepts one argument:
- The service name
Calling this event will remove the entire service from the registry.
"DONE"
This event accepts only one argument: the SOAP::Response object we sent to the handler.
Calling this event implies that this particular request is done, and will proceed to close the socket.
The content in $response->content() will be automatically serialized via SOAP::Lite's SOAP::Serializer
NOTE: This method automatically sets some parameters:
- HTTP Status = 200 ( if not defined )
- HTTP Header value of 'Content-Type' = 'text/xml'
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 SOAP requests...
"RAWDONE"
This event accepts only one argument: the SOAP::Response object we sent to the handler.
Calling this event implies that this particular request is done, and will proceed to close the socket.
The only difference between this and the DONE event is that the content in $response->content() will not
be serialized and passed through intact to the SOAP envelope. This is useful if you generate the xml yourself.
NOTE:
- The xml content does not need to have a <?xml version="1.0" encoding="UTF-8"> header
- In SOAP::Lite, the client sees '<foo>54</foo><bar>89</bar>' as '54' only!
The solution is to enclose the xml in another name, i.e. '<data><foo>54</foo><bar>89</bar></data>'
- If the xml is malformed or is not escaped properly, the client will get terribly confused!
It will be inserted here:
...<soap:Body><namesp4:TestResponse xmlns:namesp4="http://localhost:32080/">YOURSTUFFHERE</namesp4:TestResponse></soap:Body>...
"FAULT"
This event accepts five arguments:
- the HTTP::Response object we sent to the handler
- SOAP Fault Code ( not required -> defaults to 'Server' )
- SOAP Fault String ( not required -> defaults to 'Application Faulted' )
- SOAP Fault Detail ( not required )
- SOAP Fault Actor ( not required )
Again, calling this event implies that this particular request is done, and will proceed to close the socket.
Calling this event will generate a SOAP Fault and return it to the client.
NOTE: This method automatically sets some parameters:
- HTTP Status = 500 ( if not defined )
- HTTP Header value of 'Content-Type' = 'text/xml'
- HTTP Content = SOAP Envelope of the fault ( overwriting anything that was there )
"RAWFAULT"
This event accepts only one argument: the SOAP::Response object we sent to the handler.
Calling this event implies that this particular request is done, and will proceed to close the socket.
The only difference between this and the FAULT event is that you are given freedom to create your own xml for the
fault. It will be passed through intact to the SOAP envelope. Be sure to read the SOAP specs :)
This is very similar to the RAWDONE event, so go read the notes up there!
It will be inserted here:
...<soap:Body>YOURSTUFFHERE</soap:Body>...
"CLOSE"
This event accepts only one argument: the SOAP::Response object we sent to the handler.
Calling this event will proceed to close the socket, not sending any output.
"STARTLISTEN"
Starts the listening socket, if it was shut down
"STOPLISTEN"
Simply a wrapper for SHUTDOWN GRACEFUL, but will not shutdown Server::SOAP if there is no more requests
"SHUTDOWN"
Without arguments, Server::SOAP does this:
Close the listening socket
Kills all pending requests by closing their sockets
Removes it's alias
With an argument of 'GRACEFUL', Server::SOAP does this:
Close the listening socket
Waits for all pending requests to come in via DONE/FAULT/CLOSE, then removes it's alias
Processing Requests
if you're new to the world of SOAP, reading the documentation by the
excellent author of SOAP::Lite is recommended! It also would help to
read some stuff at http://www.soapware.org/ -> they have some excellent
links :)
Now, once you have set up the services/methods, what do you expect from
Server::SOAP? Every request is pretty straightforward, you just get a
Server::SOAP::Response object in ARG0.
The Server::SOAP::Response object contains a wealth of information about the specified request:
- There is the SimpleHTTP::Connection object, which gives you connection information
- There is the various SOAP accessors provided via Server::SOAP::Response
- There is the HTTP::Request object
Example information you can get:
$response->connection->remote_ip() # IP of the client
$response->soaprequest->uri() # Original URI
$response->soapmethod() # The SOAP method that was called
$response->soapbody() # The arguments to the method
Probably the most important part of SOAP::Response is the body of the
message, which contains the arguments to the method call. The data in
the body is a hash, for more information look at SOAP::Lite ->
SOAP::Deserializer.
I cannot guarantee what will be in the body, it is all up to the SOAP
serializer/deserializer. I can provide some examples:
NOTE: It is much easier to play around with parameters if they are properly encoded.
If you are using SOAP::Lite, make extensive use of SOAP::Data->name() to create parameters :)
Calling a SOAP method with no arguments:
print SOAP::Lite
-> uri('http://localhost:32080/')
-> proxy('http://localhost:32080/?session=MyServer')
-> Sum_Things()
-> result
The body will look like this:
$VAR1 = undef;
Calling a SOAP method with multiple arguments:
print SOAP::Lite
-> uri('http://localhost:32080/')
-> proxy('http://localhost:32080/?session=MyServer')
-> Sum_Things( 8, 6, 7, 5, 3, 0, 9, 183 )
-> result
The body will look like this:
$VAR1 = {
'c-gensym17' => '183',
'c-gensym5' => '6',
'c-gensym13' => '0',
'c-gensym11' => '3',
'c-gensym15' => '9',
'c-gensym9' => '5',
'c-gensym3' => '8',
'c-gensym7' => '7'
};
NOTE: The original array ordering can be received by sorting on the keys.
Calling a SOAP method with an arrayref
print SOAP::Lite
-> uri('http://localhost:32080/')
-> proxy('http://localhost:32080/?session=MyServer')
-> Sum_Things(
[ 8, 6, 7, 5, 3, 0, 9, 183 ]
)
-> result
The body will look like this:
$VAR1 = {
'Array' => [
'8',
'6',
'7',
'5',
'3',
'0',
'9',
'183'
]
};
Calling a SOAP method with a hash:
print SOAP::Lite
-> uri('http://localhost:32080/')
-> proxy('http://localhost:32080/?session=MyServer')
-> Sum_Things( {
'FOO' => 'bax',
'Hello' => 'World!',
} )
-> result
The body will look like this:
$VAR1 = {
'c-gensym21' => {
'Hello' => 'World!',
'FOO' => 'bax',
}
};
Calling a SOAP method using SOAP::Data methods:
print SOAP::Lite
-> uri('http://localhost:32080/')
-> proxy('http://localhost:32080/?session=MyServer')
-> Sum_Things(
SOAP::Data->name( 'Foo', 'harz' ),
SOAP::Data->name( 'Param', 'value' ),
)-> result
The body will look like this:
$VAR1 = {
'Param' => 'value',
'Foo' => 'harz'
};
Simply experiment using Data::Dumper and you'll quickly get the hang of
it!
When you're done with the SOAP request, stuff whatever output you have
into the content of the response object.
$response->content( 'The result is ... ' );
The only thing left to do is send it off to the DONE event :)
$_[KERNEL]->post( 'MySOAP', 'DONE', $response );
If there's an error, you can send it to the FAULT event, which will
convert it into a SOAP fault.
# See this website for more details about what "SOAP Fault" is :)
# http://www.w3.org/TR/2000/NOTE-SOAP-20000508/#_Toc478383507
$_[KERNEL]->post( 'MySOAP', 'FAULT', $response, 'Client.Authentication', 'Invalid password' );
Server::SOAP Notes
This module is very picky about capitalization!
All of the options are uppercase, to avoid confusion.
You can enable debugging mode by doing this:
sub POE::Component::Server::SOAP::DEBUG () { 1 }
use POE::Component::Server::SOAP;
In the case you want to see the raw xml being received/sent to the
client, set DEBUG to 2.
Yes, I broke a lot of things in the release ( 1.01 ), but Rocco agreed
that it's best to break things as early as possible, so that development
can move on instead of being stuck on legacy issues.
Using SSL
So you want to use SSL in Server::SOAP? Here's a example on how to do
it:
POE::Component::Server::SOAP->new(
...
'SIMPLEHTTP' => {
'SSLKEYCERT' => [ 'public-key.pem', 'public-cert.pem' ],
},
);
# And that's it provided you've already created the necessary key + certificate file :)
Ah, to use SSL in SOAP::Lite, simply use https://blah.com instead of
http://blah.com
SUPPORT
You can find documentation for this module with the perldoc command.
perldoc POE::Component::Server::SOAP
Websites
* AnnoCPAN: Annotated CPAN documentation
<http://annocpan.org/dist/POE-Component-Server-SOAP>
* CPAN Ratings
<http://cpanratings.perl.org/d/POE-Component-Server-SOAP>
* RT: CPAN's request tracker
<http://rt.cpan.org/NoAuth/Bugs.html?Dist=POE-Component-Server-SOAP>
* Search CPAN
<http://search.cpan.org/dist/POE-Component-Server-SOAP>
Bugs
Please report any bugs or feature requests to
"bug-poe-component-server-soap at rt.cpan.org", or through the web
interface at
<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=POE-Component-Server-SOA
P>. I will be notified, and then you'll automatically be notified of
progress on your bug as I make changes.
SEE ALSO
The examples directory that came with this component.
POE
HTTP::Response
HTTP::Request
POE::Component::Server::SOAP::Response
POE::Component::Server::SimpleHTTP
SOAP::Lite
POE::Component::SSLify
AUTHOR
Apocalypse <apocal@cpan.org>
I took over this module from Rocco Caputo. Here is his stuff:
POE::Component::Server::SOAP is Copyright 2002 by Rocco Caputo. All
rights are reserved. POE::Component::Server::SOAP is free software;
you may redistribute it and/or modify it under the same terms as Perl
itself.
Rocco may be contacted by e-mail via rcaputo@cpan.org.
COPYRIGHT AND LICENSE
Copyright 2009 by Apocalypse
This library is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.