Goodies and Gimmicks for a user-friendly access to Grids Mathias Stümpert (Karlsruhe Institute of Technology) Ariel Garcia (Karlsruhe Institute of Technology) March 18th, 2008 EclipseCon 2008 Santa Clara

Topics g-AAI - Authentication and Authorization g-EFS - Data management with EFS g-PRM - The Problem Reporting Mechanism

g-AAI - Authentication and Authorization Infrastructure Provides an abstraction layer and an extension point for plugging in any type of authentication token Provides tokens for: Globus proxies (X509) VOMS proxies (X509 with extensions) GRIA key stores Open for other tokens (SSH, Shibboleth...) Provides mechanism for creating tokens on demand: of a specific type and with specific parameters Tokens are stored (not persistent!) for re-use Common graphical user interface for all tokens

g-AAI - Workflow Requesting a token with an AuthTokenRequest that contains an IAuthenticationTokenDescription which is specific for an IAuthenticationToken and holds the parameters of the token to be created. The AuthTokenProvider looks up all existing tokens in the AuthTokenManager and returns a matching token or asks the user to create a new one with the AuthTokenWizard if no matching token could be found.

g-EFS - Data management with g-Eclipse One of the main use-cases for Grids is data management g-Eclipse integrates existing EFS implementations into its views: browse an EFS copy&paste/drag&drop data among different EFSes Create/delete files/folders Open, edit and save back files g-Eclipse itself implements EFS for GridFTP/GSIFTP (Globus middleware) SRM (gLite middleware) LFC (gLite middleware)

g-EFS - The Exploring Perspective

g-EFS - The Connection Wizard Local Connection Remote (GSIFTP) Connection

g-PRM - The traditional ways Accessing Grids is difficult and error-prone Error messages are often rather cryptic Traditional error reporting (exception handling) supports only plain descriptive texts as error messages Eclipse way uses CoreException and IStatus which already gives more information about the type of the error (warning, error, ...) details of the error (error code) where the error happened (plug-in ID) contexts (MultiStatus)

g-PRM - The g-Eclipse way g-Eclipse deals with problems, not with errors Therefore g-Eclipse defines the ProblemException, which inherits from CoreException - i.e. supports IStatus - and may have an associated IProblem An IProblem is comprised of: a description (String) one or more optional reasons (String) one or more optional solutions (ISolution) an optional mailto-field for sending error reports an exception, plug-in id, etc. (i.e. IStatus)

g-PRM - Offering solutions for problems Solutions are comprised of a description (String) and an optional solver (ISolver) Solutions are either active (if a solver is defined) or passive Passive solutions are just plain text giving the user hints how to solve a problem Active solutions can trigger an action in the UI that solves or at least may help the user to solve a problem

g-PRM - Defining problems and solutions Problems and solutions may be defined either programmatically, i.e. via the API, or declaratively, i.e. with the help of an extension point The extension point allows to specify problems specify solutions make solutions active by either specifying an ISolver for the solution or by tagging the solution with a predefined solver tag Predefined tags exist for opening a preference page opening a view assign solutions to a problem and vice versa. This means that solutions may be re-used by different problems

g-PRM - Features Problems and solutions are defined in plugin.xml Problems are propagated with an exception Already defined problems can be used by other plug-ins Solutions can be added to existing problems in code by catching a ProblemException and adding a solution to the problem from other plug-ins by defining a solution and linking it to the problem (backward-link) Reasons can be added to existing problems in code by catching a ProblemException and adding a reason to the problem.

g-PRM - How it looks like

g-PRM - How it looks like