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Introduction to Access Grid Development

Introduction to Access Grid Development. Agenda. Architecture AG Application Basics AccessGrid module overview Example application Exercises. Architecture. Technologies. Python wxPython pyGlobus SOAP (SOAPpy) pyOpenSSL. AG Application Basics.

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Introduction to Access Grid Development

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  1. Introduction to Access Grid Development

  2. Agenda • Architecture • AG Application Basics • AccessGrid module overview • Example application • Exercises

  3. Architecture

  4. Technologies • Python • wxPython • pyGlobus • SOAP (SOAPpy) • pyOpenSSL

  5. AG Application Basics An Access Grid client application will perform (at least) these steps: • Create an application instance • Initialize application • Create an interface wrapper • Call methods on the interface wrapper

  6. AG Application Basics • The core of an AG application is an instance of AccessGrid.Toolkit.Application AppBase Application Service CmdlineApplication WXGUIApplication

  7. AG Application Basics • Distinguished between GUI and non-GUI applications to generalize user interactions (for example, prompt for passphrase, error reporting) • CmdlineApplication • Examples: BridgeServer, VenueServer, AGNodeService • WXGUIApplication • Examples: VenueClient, VenueManagement, NodeManagement

  8. Application Initialization • Create AG application instance • Initialize application • Verify certificate repository • Load default certificate • Create proxy certificate • Configure Globus environment app = CmdlineApplication.instance() app.Initialize(appName) • appName is used in logfile name

  9. Argument Processing • Standard Python module optparse is integrated into toolkit • Add option to application before initialization • Access options post-initialization app.AddCmdLineOption( optparse.Option(‘-u’,’—url’, dest=‘url’)) app.Initialize(‘SampleApp’) url = app.GetOption(‘url’)

  10. Standard Toolkit Arguments • The toolkit adds some options to all applications • Available options can be viewed with ‘-h’ or –help • Examples -d (turn on debug) -l <logFileName> --logfilesize <size> --numlogfiles <num> (rollover log files)

  11. Logging • Standard Python module logging is integrated into AccessGrid toolkit • Multiple logging levels are defined (see logging module documentation) • CRITICAL, ERROR, WARNING, INFO, DEBUG • Logging levels can be controlled for individual components in an application • Application will create appName.log (appName is from app.Initialize) in Log directory: • Windows: %APPDATA%\AccessGrid\Logs • Linux/OSX: $HOME/.AccessGrid/Logs • Logging calls in code will appear in logfile, according to call and current logging level • log.debug(‘this is debug logging text’)

  12. AccessGrid Module Overview • AccessGrid • Core toolkit code • AccessGrid.Security • CertificateManager, CertificateRepository, etc. • AuthorizationManager, Role, Action, etc. • AccessGrid.Platform • Platform-specific code • Config.{SystemConfig,UserConfig,etc.} • ProcessManager • AccessGrid.hosting • SOAP implementation adapters

  13. AccessGrid Module API Documentation

  14. Interfaces and InterfaceWrappers • Described in online API documentation • Interface wrappers are defined in individual modules • For example, AccessGrid.Venue.VenueIW • IW (and I) class methods handle serialization/deserialization of data types from SOAP implementation domain to AG application domain

  15. Available InterfaceWrappers • VenueIW • VenueServerIW • VenueClientIW • AGNodeServiceIW • AGServiceManagerIW • AGServiceIW • AuthorizationManagerIW • SharedApplicationIW • NetworkServiceIW

  16. VenueIW

  17. Types • Many types are found in Descriptions.py • StreamDescription • ApplicationDescription • Others are found in their own modules • ClientProfile • AGParameter • Capability

  18. AG Applications An Access Grid client application will perform (at least) these steps: • Create an application instance • Initialize application • Create an interface wrapper • Call methods on the interface wrapper

  19. Example: GetClients.py #!/usr/bin/python2 import sys from AccessGrid.Toolkit import CmdlineApplication from AccessGrid.Venue import VenueIW url = sys.argv[1] # Create and initialize application app = CmdlineApplication() app.Initialize('qwe') # Create venue interface wrapper venue = VenueIW(url) # Get clients from venue and process clientList = venue.GetClients() for client in clientList: print client

  20. Example: GetClients.py python GetClients.py https://vv2.mcs.anl.gov:9000/Venues/default Profile Type: user Name: Tom Uram Email: turam@mcs.anl.gov Phone Number: Location: Chicago, IL Venue Client URL: https://wormtongue.mcs.anl.gov:11000/VenueClient Public ID: 00000102220e6208008c00dd0022004754d Home Venue: https://vv2.mcs.anl.gov:9000/Venues/default

  21. Example: GetClients.py • Check logfile GetClients.log

  22. Notes • Online workshop materials: http://www.mcs.anl.gov/fl/research/accessgrid/documentation/tutorial/AGTk_2.4 • Online developer documentation (including API reference): http://www.mcs.anl.gov/fl/research/accessgrid/software/developer.html • OSX users will need to source an environment file to run code in a terminal • /Applications/AccessGridToolkit.app/Contents/Resources/setupenv.sh

  23. Exercise: GetStreams.py • Modify GetClients.py to call GetStreams instead of GetClients • Return value is a list of Descriptions.StreamDescription

  24. Exercise: GetUsers.py • Modify GetClients.py to call VenueClientIW.GetUsers • Return value is a list of ClientProfile

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