Stateful SOAP Webservices

Stateful SOAP Webservices with Java and PHP International PHP Conference 2008 – Spring Edition Thorsten Rinne

Introduction ❙ Thorsten Rinne ❙ 31 years old ❙ Graduated in computer science ❙ Project manager at Mayflower GmbH, Munich ❙ Reporting applications ❙ Critical bank applications ❙ PHP Consulting ❙ PHP software development since 1999 ❙ Founder and main developer of Open Source FAQ- management software phpMyFAQ since 2001 ❙ Zend Certified Engineer (PHP 5) Stateful SOAP Webservices © MAYFLOWER GmbH 2008 2

Summary ❙ Introduction ❙ SOAP and PHP ❙ Stateful SOAP Webservices ❙ Implemention ❙ Real world example ❙ Questions and answers Stateful SOAP Webservices © MAYFLOWER GmbH 2008 3

What is SOAP? ❙ SOAP is a protocol for exchanging XML-based messages over computer networks ❙ It uses HTTP, HTTPS or SMTP ❙ SOAP is the successor of XML-RPC ❙ Advantages ❙ using SOAP over HTTP allows for easier communication through proxies and firewalls ❙ platform independent ❙ language independent ❙ Disadvantages ❙ Slower than technologies like CORBA ❙ Bad performance with binary data Stateful SOAP Webservices © MAYFLOWER GmbH 2008 4

A simple SOAP message ❙ Simple structure of a SOAP message <?xml version=quot;1.0quot;?> <s:Envelope xmlns:s=quot;http://www.w3.org/2001/12/soap-envelopequot;> <s:Header> </s:Header> <s:Body> </s:Body> </s:Envelope> Stateful SOAP Webservices © MAYFLOWER GmbH 2008 5

Using SOAP with PHP ❙ ext/soap can be used to write SOAP servers and clients ❙ Support of subsets of SOAP 1.1, SOAP 1.2 and WSDL 1.1 specifications ❙ No built-in support for WS-Addressing! ❙ SOAP server $server = new SoapServer('some.wsdl', array('soap_version' => SOAP_1_2)); ❙ SOAP client $client = new SoapClient('some.wsdl', array('soap_version' => SOAP_1_2)); Stateful SOAP Webservices © MAYFLOWER GmbH 2008 6

Stateful SOAP Webservices ❙ By default, SOAP webservices are stateless ❙ A stateful SOAP webservice is a webservice that maintains state information between message calls ❙ Session ID is stored in the SOAP header with WS-Addressing (WS-A) ❙ How do stateful SOAP webservices work? ❙ Request by SOAP client CS ❙ SOAP session will be created by SOAP server ❙ Response from SOAP server to SOAP client with Session ID CS ❙ More interaction between client and server ❙ Used in mulit-user environments with multiple requests/responses Stateful SOAP Webservices © MAYFLOWER GmbH 2008 7

Implementation Apache Axis2 example: <wsa:ReplyTo> <wsa:Address> http://www.w3.org/2005/08/addressing/anonymous </wsa:Address> <wsa:ReferenceParameters> <axis2:ServiceGroupId xmlns:axis2= quot;http://ws.apache.org/namespaces/axis2quot;> urn:uuid:65E9C56F702A398A8B11513011677354 </axis2:ServiceGroupId> </wsa:ReferenceParameters> </wsa:ReplyTo> Stateful SOAP Webservices © MAYFLOWER GmbH 2008 8

PHP implementation ❙ ext/soap doesn‘t support SOAP sessions ❙ Would be possible with WSO2 Web Services Framework/PHP (WSO2 WSF/PHP) extension ❙ We have to overwrite the SoapClient::__doRequest() method from PHP to implement WS-Addressing support ❙ First, we have to add a WS-A class written by Rob Richards (http://www.cdatazone.org/files/soap-wsa.phps) ❙ Parses to the SOAP XML header ❙ Sets the session ID ❙ Also support for WS-Security (WS-S) if needed Stateful SOAP Webservices © MAYFLOWER GmbH 2008 9

PHP implementation (I) class MyProject_SOAPClient extends SoapClient { public function __doRequest($request, $location, $saction, $version) { $dom = new DOMDocument(); $dom->loadXML($request); $wsasoap = new WSASoap($dom); $wsasoap->addAction($saction); $wsasoap->addTo($location); $wsasoap->addMessageID(); // Sets the session ID $wsasoap->addReplyTo(); $request = $wsasoap->saveXML(); return parent::__doRequest($request, $location, $saction, $version); } } Stateful SOAP Webservices © MAYFLOWER GmbH 2008 10

PHP implementation (II) class OurService { /* … */ $axis2session = $this->_getSoapSession($this->soapClient->__getLastResponse()); $soapHeader = new SoapHeader('http://ws.apache.org/namespaces/axis2', 'ServiceGroupId',$axis2session); $this->soapClient->__soapCall('getData', array(), null, $soapHeader); /* … */ private function _getSoapSession($response) { $soapsession = ''; $xml = new XMLReader(); $xml->XML($response); while ($xml->read()) { if (strpos($xml->name, 'axis2:ServiceGroupId') !== false) { $xml->read(); $soapsession = $xml->value; $xml->read(); } } return $soapsession; } Stateful SOAP Webservices } © MAYFLOWER GmbH 2008 11

Welcome to the real world ❙ Various applications based on ❙ Java (main application) ❙ Excel with a included DLL written in C++ ❙ Access/Visual Basic ❙ Web application in PHP (our project) ❙ All applications were using the same calculation logic but implemented in different programming language ❙ Big problems when the logic changes ❙ Solution ❙ Migration of the Access tool into the PHP application ❙ Build a SOAP service on top of the Java classes ❙ Replace the C++ written library and our PHP based library with the SOAP webservice Stateful SOAP Webservices © MAYFLOWER GmbH 2008 12

Welcome to the real world! Old architecture Microsoft Office Client PC Microsoft Access and Excel mod_php MySQL Apache 2.0 Linux J2EE Cluster (Calculation engine) Stateful SOAP Webservices © MAYFLOWER GmbH 2008 13

Welcome to the real world! Current architecture J2EE Cluster (Calculation engine) Microsoft Office Client PC Transfer by SFTP SOAP over HTTPS SOAP SOAP mod_php Axis2 java.class MySQL Apache 2.0 Tomcat 5.5 Linux Stateful SOAP Webservices © MAYFLOWER GmbH 2008 14

Thank you very much! Thorsten Rinne, Dipl.-Inf. (FH) Mayflower GmbH Mannhardtstraße 6 D-80538 München Germany +49 (89) 24 20 54 – 31 thorsten.rinne@mayflower.de

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Stateful SOAP Webservices

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