Part 6 - Authentication

caGrid Client on Django on Jython

Part 8 - Discover Services

Part 7 : List Services

	Table of Contents Step 1: Construct the List Template Step 2: Add the List methods Step 3: Add the List URLs Step 4: Test the List page

Step 1: Construct the List Template

1. In mytemplates/thewebapp make the template listservices.html
2. Enter the following into the file

   {% if the_username %}
   	Hello <b>{{ the_username }}</b>, you are logged in. Do you want to <a href="/logout/">Logout?</a><br>
   {% else %}
   	Hello, do you want to <a href="/login/">Login</a> to save queries and query secure data services?<br>
   {% endif %}
   <h1>List Services</h1>
   
   {% if error_message %}<p><strong>{{ error_message }}</strong></p>{% endif %}
   <form action="/listservices/">
   	<input type="radio" name="service" value="1">All Services<br>
   	<input type="radio" name="service" value="2">Data Services<br>
   	<input type="radio" name="service" value="3">Analytical Services<br>
   	<input type="submit" value="Submit" />
   </form>
   {% if services %}
   	{% for aservice in services %}
   		{{ aservice }}<br>
   	{% endfor %}
   {% endif %}
   
   <a href="/index/">Back to the Index</a><br>
   

3. Save the file

Step 2: Add the List methods

1. Open GridClient/views.py
2. Add imports, don't worry if eclipse complains about the imports

   from gov.nih.nci.cagrid.discovery.client import DiscoveryClient
   from gov.nih.nci.cagrid.metadata import MetadataUtils
   from org.apache.axis.types.URI import MalformedURIException
   from gov.nih.nci.cagrid.metadata.exceptions import QueryInvalidException, RemoteResourcePropertyRetrievalException, ResourcePropertyRetrievalException
   

3. Add public variables

   #make a discoveryClient with the index service url
   discClient=DiscoveryClient(props.getProperty(DEFAULT_INDEX_SERVICE_URL_PROP))
   

4. Add the listservices method

   def listservices(request):
       if "service" in request.GET:
           try:
               services=[]
               serviceType = int(request.GET['service'])
              
               if (serviceType == 1): serviceEndpoints = discClient.getAllServices(1)
               elif (serviceType == 2): serviceEndpoints = discClient.getAllDataServices()
               else: serviceEndpoints = discClient.getAllAnalyticalServices()
               count=1
               for ase in serviceEndpoints:
                   try:
                       services.append("%i: %s" % (count,ase.getAddress()))
                       metadata = MetadataUtils.getServiceMetadata(ase)
                       description = metadata.getServiceDescription().getService().getDescription()
                       services.append("Description: %s" % description)
                       hostingCenter = metadata.getHostingResearchCenter().getResearchCenter().getDisplayName()
                       services.append("Hosting Center: %s" % hostingCenter)
                   except Exception, e:
                       services.append("metadata %s" % e)
                   services.append("")
                   count=count+1
               if(len(serviceEndpoints)==0):
                   services.append("No matching Services found")
               return render_to_response('thewebapp/listservices.html', 
                                         {'the_username':logged_in(request),
                                          'services': services,}, 
                                         context_instance=RequestContext(request))
           except (MalformedURIException,
                   RemoteResourcePropertyRetrievalException,
                   QueryInvalidException,
                   ResourcePropertyRetrievalException,
                   Exception), e:
               return render_to_response('thewebapp/listservices.html', 
                                 {'the_username':logged_in(request),
                                  'error_message':e,}, 
                                 context_instance=RequestContext(request))
       
       else:return render_to_response('thewebapp/listservices.html',
                                      {'the_username':logged_in(request),},
                                      context_instance=RequestContext(request)) 
   

5. Save the file

Step 3: Add the List URLs

1. Open GridClient/urls.py
2. Add the listservices url and the listservices method in urlpatterns

   urlpatterns = patterns('',
       (r'^index/$', 'thewebapp.views.index'),
       (r'^login/$', 'thewebapp.views.login'),
       (r'^logout/$', 'thewebapp.views.logout'),
       (r'^badlogin/$', 'thewebapp.views.badlogin'),
       (r'^listservices/$','thewebapp.views.listservices'),
   )
   

3. Save the file

Step 4: Test the List page

1. Go to http://localhost:8000/listservices/
2. Select Data Services and press Submit, you should see the resulting data services

Part 6 - Authentication

caGrid Client on Django on Jython

Part 8 - Discover Services