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Cool Things: ILE RPG as a Web Services Client

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Use IBM's Web Services Client for ILE to consume a web service in an ILE RPG program.

 

Web services serve many purposesfrom utilizing external web services for things like retrieving exchange rates or tracking shipments, to using internal web services as a means of communicating between applications within your organization. The task of writing a program to consume a web service can be relatively simple or very complicated, depending on the requirements of the web service that you're consuming. In this article, we'll explore how to use Web Service Definition Language (WSDL) to easily consume a web service in an RPGLE program.

WSDL

WSDL is intended to provide developers and applications a means by which to determine what data is to be exchanged with a web service. IBM's Web Services Client for ILE gives you a utility to create a stub ILE service program in RPG to allow you to easily consume a web service. WSDL2RPG can generate an RPGLE service program that provides a means by which you can easily consume a web service from within an RPGLE program. The process is fairly simple. First and foremost, you need to make sure that you have the required PTF that adds the WSDL2RPG script to your system. Below is a table that shows the PTFs for each release of the OS from V5R4 forward.

 

OS Version

PTF

V5R4M0

SI42234

V6R1M0

SI42236

V7R1M0

SI42235

 

Once you've ensured that you have the appropriate PTF for your release installed, you're ready to go. The Qshell script for WSDL2RPG is created in this folder:

 

/QIBM/ProdData/OS/WebServices/V1/client/bin

 

Before you can execute the script, you'll need the location of the WSDL document that describes the web service. That location can be either the HTTP location of the WSDL or a local WSDL document on the IFS. The WSDL2RPG.SH script is executed using the following format:

 

/QIBM/ProdData/OS/WebServices/V1/client/bin/wsdl2rpg.sh <options> URI-To-WSDL

 

The options available for this script are listed below:

  • -h/-helpDisplays help text for the script/command.
  • -o [path] Sets the output directory for the source to be created.
  • -ms [number]Defines the maximum size for RPG character fields used to hold string data. For V5R4, the value can be between 16 and 650004. For V6R1 and higher, the range is 16 to 80000004. The default value is 128.
  • -mb [number]Defines the maximum size for binary fields holding character data. The range is 48 to 650004 for V5R4 and 48 to 160000004 for V6R1 and higher.
  • -ma [number]Defines the maximum array size for RPG arrays. The range is from 1 to 320004 for V5R4 and 1 to 80000004 for V6R1 and higher. The default value is 20.
  • -s [path]This value is the full /qsys.lib path to the service program to be created.
  • -dThis option indicates that the resulting service program should be generated with debugging views.

 

As I mentioned earlier, you can specify the WSDL document as either a local IFS resource or using a full URI to the WSDL on web service. As an example of this, we'll use a free currency convertor web service. Enter the Qshell command line by typing QSH at the command line. Next, we need to create a folder to contain the source for the service programs. Type the following command inside the Qshell command line:

 

Mkdir /CurrConv

 

Now use the WSDL2RPG.sh script to generate our service program.

 

/QIBM/ProdData/OS/WebServices/V1/client/bin/wsdl2rpg.sh -o/CurrConv
     –s/qsys.lib/mylib.lib/Currency.srvpgm                 http://www.webservicex.com/currencyconvertor.asmx?WSDL

 

In this example, our output source will be generated in the /CurrConv IFS folder. The resulting service program will be created in the library MYLIB and will be named CURRENCY. The source members created by the script will be named based on the portType value from the provided WSDL document. In our example, this value is CurrencyConvertor. After executing the script above, you should see the following documents in the /CurrConv folder:

 

  • CurrencyConvertorSoap.clCL to create the service program
  • CurrencyConvertorSoap.rpleincInclude RPGLE source member
  • CurrencyConvertorSoap.rpgleService program RPGLE source
  • CurrencyConvertorSoap_util.rpgleincRPGLE utility include source
  • CurrencyConvertorSoap_util.rpgleRPGLE utility source code
  • CurrencyConvertorSoap_xsdtypes.rpgleincXSD data type include source

 

The source for all of the examples for this tip can be downloaded here. In addition to these, you'll find the C language includes and source for the C stub that is used by the RPGLE stub to access the web service. After executing the WSDL2RPG.sh script, you will also have an RPG service program named CURRENCY in the library specified as MYLIB above. For each operation supported by the web service, the created service program will contain a stub subprocedure. The naming convention will be stub_op_ followed by the name of the web service operation. In our example, that sub-procedure is stub_op_ConversionRate. To consume that service program, we simply need to include the "rpgleinc" source in our RPG program and then initiate a call to three subprocedures inside of the service program:

  • Stub_create_CurrencyConvertorSoap(webService_ds)Create a connection to the web service and store the details in the data structure webService_ds.
  • Stub_op_ConversionRate(webService_ds: fromRate_stringDS: toRate_stringDS: rateAmount_DS)Perform the conversion operation on the supplied web service and return the rate.
  • Stub_destroy_CurrencyConvertorSoap(webService_ds)Disconnect from the supplied web service.

 

In each of these examples, the webService_ds value identifies a data structure that contains information about the web service itself. This data structure contains the following:

 

 

  • Endpoint URLThe URL for the web service as a 2048 character field. If this value is blank, the endpoint from the WSDL is used.
  • HandleA pointer to the C stub handle when invoking AXIS API.
  • Exception IndicatorAn indicator variable that identifies that an exception has occurred.
  • Exception CodeAn integer code associated with the error condition.
  • Exception StringA 2048-character description of the error.
  • ReservedReserved 1024 character field.

 

The program below utilizes the CURRENCY service program to retrieve the exchange rate from U.S. dollars to Canadian dollars.

 

       //----------------------------------------------------------------------

       // Sample Program To Consume the CurrencyConversion Web Service

       // Using the RPGLE Stub Service Program "CURRENCY"

       //

       // Create using: CRTRPGMOD MODULE(mylib/CURRCONV)

       //                         SRCFILE(mylib/QRPGLESRC)

       //                         SRCMBR(CURRCONV)

       //                         REPLACE(*NO)

       //                          INCDIR('/home/myfolder')

       //

       //               CRTPGM PGM(mylib/CURRCONV)

       //                     BNDSRVPGM((mylib/CURRENCY)

       //

       //

       //----------------------------------------------------------------------

 

       // The include members below are created by WSDL2RPG

     /copy CurrencyConvertorSoap.rpgleinc

     /copy CurrencyConvertorSoap_util.rpgleinc

 

     d ws_ds           ds                 likeds(This_t) inz

     d amount         ds                 likeds(xsd_double)

     d fromCode       ds                 likeds(xsd_string)

     d toCode         ds                 likeds(xsd_string)

     d decAmt         s             13 2

     d rtnInd         s             1n

 

     /free

       // Define our "FROM" and "TO" Currency Codes based on

       // Constants defined to the web service stub

       fromCode.value = Currency_USD;

       toCode.value = Currency_CAD;

 

       // Create a connection to the web service

       if stub_create_CurrencyConvertorSoap(ws_ds);

 

         // Call the web service conversion rate operation

         rtnInd = stub_op_ConversionRate( ws_ds

                                   : fromCode

                                   : toCode

                                  : amount);

 

         // Convert and display the returned conversion rate

         decAmt = %dec(amount.value: 13:2);

         if rtnInd and not amount.isNil;

             dsply %char(decAmt);

         endif;

 

         // Close the web service connection

         stub_destroy_CurrencyConvertorSoap(ws_ds);

       else;

         dsply %subst(ws_ds.excString:1:50);

       endif;

       *inlr = *on;

       return;

     /end-free

 

This simple example illustrates a few things about the web service stub. First off, you'll notice the Currency_USD and Currency_CAD constants used to identify the currency codes to convert from and to. All of the currency code constants are defined in the RPGLEINC source created by the WSDL2RPG script. You'll also see the xsd_double and xsd_string types used to define the variables used in the program. These variables are actually qualified data structures that are defined in the CurrencyConvertorSoap_xsdtypes.rpgleinc source. These data structures contain an isNil subfield that is an indicator variable which identifies that the value is null along with a value subfield that contains the actual value of the element. Note that we do not provide a value in the ws_ds parameter. If for some reason we needed to provide a different URI for the web service endpoint from that defined in the WSDL, we would define that alternate URI in the ws_ds.endpoint value.

Simple but Powerful

This simple example illustrates how easy it is to consume a web service in an RPGLE program using the WSDL2RPG script. For more information on this powerful functionality, check out the Web Services Client for ILE Programming Guide.

 

Mike Faust

Mike Faust is a senior consultant/analyst for Retail Technologies Corporation in Orlando, Florida. Mike is also the author of the books Active Server Pages Primer, The iSeries and AS/400 Programmer's Guide to Cool Things, JavaScript for the Business Developer, and SQL Built-in Functions and Stored Procedures. You can contact Mike at mikeffaust@yahoo.com.


MC Press books written by Mike Faust available now on the MC Press Bookstore.

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    SB PowerTech WC GenericA growing number of compliance mandates require sensitive data to be encrypted. But what kind of encryption solution will satisfy an auditor and how can you implement encryption on IBM i? Watch this on-demand webinar to find out how to meet today’s most common encryption requirements on IBM i. You’ll also learn:

    • Why disk encryption isn’t enough
    • What sets strong encryption apart from other solutions
    • Important considerations before implementing encryption

     

     

  • Security Bulletin: Malware Infection Discovered on IBM i Server!

    SB PowerTech WC GenericMalicious programs can bring entire businesses to their knees—and IBM i shops are not immune. It’s critical to grasp the true impact malware can have on IBM i and the network that connects to it. Attend this webinar to gain a thorough understanding of the relationships between:

    • Viruses, native objects, and the integrated file system (IFS)
    • Power Systems and Windows-based viruses and malware
    • PC-based anti-virus scanning versus native IBM i scanning

    There are a number of ways you can minimize your exposure to viruses. IBM i security expert Sandi Moore explains the facts, including how to ensure you're fully protected and compliant with regulations such as PCI.

     

     

  • Fight Cyber Threats with IBM i Encryption

    SB PowerTech WC GenericCyber attacks often target mission-critical servers, and those attack strategies are constantly changing. To stay on top of these threats, your cybersecurity strategies must evolve, too. In this session, IBM i security expert Robin Tatam provides a quick recap of IBM i security basics and guides you through some advanced cybersecurity techniques that can help you take data protection to the next level. Robin will cover:

    • Reducing the risk posed by special authorities
    • Establishing object-level security
    • Overseeing user actions and data access

     

     

     

  • 10 Practical IBM i Security Tips for Surviving Covid-19 and Working From Home

    SB PowerTech WC GenericNow that many organizations have moved to a work from home model, security concerns have risen.

    During this session Carol Woodbury will discuss the issues that the world is currently seeing such as increased malware attacks and then provide practical actions you can take to both monitor and protect your IBM i during this challenging time.

     

  • How to Transfer IBM i Data to Microsoft Excel

    SB_HelpSystems_WC_Generic3 easy ways to get IBM i data into Excel every time
    There’s an easy, more reliable way to import your IBM i data to Excel? It’s called Sequel. During this webinar, our data access experts demonstrate how you can simplify the process of getting data from multiple sources—including Db2 for i—into Excel. Watch to learn how to:

    • Download your IBM i data to Excel in a single step
    • Deliver data to business users in Excel via email or a scheduled job
    • Access IBM i data directly using the Excel add-in in Sequel

    Make 2020 the year you finally see your data clearly, quickly, and securely. Start by giving business users the ability to access crucial business data from IBM i the way they want it—in Microsoft Excel.

     

     

  • HA Alternatives: MIMIX Is Not Your Only Option on IBM i

    SB_HelpSystems_WC_GenericIn this recorded webinar, our experts introduce you to the new HA transition technology available with our Robot HA software. You’ll learn how to:

    • Transition your rules from MIMIX (if you’re happy with them)
    • Simplify your day-to-day activities around high availability
    • Gain back time in your work week
    • Make your CEO happy about reducing IT costs

    Don’t stick with a legacy high availability solution that makes you uncomfortable when transitioning to something better can be simple, safe, and cost-effective.

     

     

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  • Backup and Recovery on IBM i: Your Strategy for the Unexpected

    SB HelpSystems SC 5413Robot automates the routine tasks of iSeries backup and recovery, saving you time and money and making the process safer and more reliable. Automate your backups with the Robot Backup and Recovery Solution. Key features include:
    - Simplified backup procedures
    - Easy data encryption
    - Save media management
    - Guided restoration
    - Seamless product integration
    Make sure your data survives when catastrophe hits. Try the Robot Backup and Recovery Solution FREE for 30 days.

  • Manage IBM i Messages by Exception with Robot

    SB HelpSystems SC 5413Managing messages on your IBM i can be more than a full-time job if you have to do it manually. How can you be sure you won’t miss important system events?
    Automate your message center with the Robot Message Management Solution. Key features include:
    - Automated message management
    - Tailored notifications and automatic escalation
    - System-wide control of your IBM i partitions
    - Two-way system notifications from your mobile device
    - Seamless product integration
    Try the Robot Message Management Solution FREE for 30 days.

  • Easiest Way to Save Money? Stop Printing IBM i Reports

    SB HelpSystems SC 5413Robot automates report bursting, distribution, bundling, and archiving, and offers secure, selective online report viewing.
    Manage your reports with the Robot Report Management Solution. Key features include:

    - Automated report distribution
    - View online without delay
    - Browser interface to make notes
    - Custom retention capabilities
    - Seamless product integration
    Rerun another report? Never again. Try the Robot Report Management Solution FREE for 30 days.

  • Hassle-Free IBM i Operations around the Clock

    SB HelpSystems SC 5413For over 30 years, Robot has been a leader in systems management for IBM i.
    Manage your job schedule with the Robot Job Scheduling Solution. Key features include:
    - Automated batch, interactive, and cross-platform scheduling
    - Event-driven dependency processing
    - Centralized monitoring and reporting
    - Audit log and ready-to-use reports
    - Seamless product integration
    Scale your software, not your staff. Try the Robot Job Scheduling Solution FREE for 30 days.

  • ACO MONITOR Manages your IBM i 24/7 and Notifies You When Your IBM i Needs Assistance!

    SB DDL Systems 5429More than a paging system - ACO MONITOR is a complete systems management solution for your Power Systems running IBM i. ACO MONITOR manages your Power System 24/7, uses advanced technology (like two-way messaging) to notify on-duty support personnel, and responds to complex problems before they reach critical status.

    ACO MONITOR is proven technology and is capable of processing thousands of mission-critical events daily. The software is pre-configured, easy to install, scalable, and greatly improves data center efficiency.