Nothing at all against Cheetah, and the templating output definitely makes
sense. I might suggest you take a look at Jinja as an alternative, only because
it's templating format will (I believe) be more familiar - it's effectively the
same (i.e. a mirror of function and format) template mechanism that's used in
Django, and hence in the Openstack Dashboard project.
- joe
On Aug 11, 2011, at 8:26 AM, Salvatore Orlando wrote:
> Hi,
>
> I’m writing the unit tests for CLI. Verifying successful completion of API
> operations implies checking the output of the CLI, which could be tedious,
> error-prone, and not easy to maintain.
> For this reason I’m thinking of introducing Cheetah templates for generating
> CLI output. This will simplify the implementation of the CLI itself, and
> terribly reduce the maintenance burden on unit tests.
>
> Has anybody strong reasons against using Cheetah?
>
> Also, the CLI can currently operates in two modes:
> · Direct, by directly calling the plugin
> · API, by contacting the API server
> Do we still have a use case for the first operational mode?
>
> Since this post is mainly related to implementation, let’s talk some code:
>
> Current CLI operations for retrieving network list (direct to plugin and
> through API):
>
> def list_nets(manager, *args):
> tenant_id = args[0]
> networks = manager.get_all_networks(tenant_id)
> print "Virtual Networks on Tenant:%s\n" % tenant_id
> for net in networks:
> id = net["net-id"]
> name = net["net-name"]
> print "\tNetwork ID:%s \n\tNetwork Name:%s \n" % (id, name)
>
>
> def api_list_nets(client, *args):
> tenant_id = args[0]
> res = client.list_networks()
> LOG.debug(res)
> print "Virtual Networks on Tenant:%s\n" % tenant_id
> for n in res["networks"]:
> net_id = n["id"]
> print "\tNetwork ID:%s\n" % (net_id)
>
> Same code revised using cheetah template:
>
> def list_nets(manager, *args):
> tenant_id = args[0]
> networks = manager.get_all_networks(tenant_id)
> builder=NetworkBuilder()
> nw_list = [builder.build(network, net_detail=True,
> port_detail=False)['network']
> for network in networks]
> res = dict(networks=nw_list)
> output = prepare_output("list_nets", tenant_id, res)
> print output
>
>
> def api_list_nets(client, *args):
> tenant_id = args[0]
> res = client.list_networks()
> output = prepare_output("list_nets", tenant_id, res)
> print output
>
> The chetaah template file:
>
> ## Cheetah template for cli output
> #if $cmd == 'list_nets'
> Virtual Networks on Tenant $tenant_id
> #for $network in $networks
> \tNetwork ID: $network.id
> #end for
> #end if
>
> Unit tests for the same operation:
>
> def _verify_list_networks(self):
> # Verification - get raw result from db
> nw_list = db.network_list(self.tenant_id)
> networks=[dict(id=nw.uuid, name=nw.name) for nw in nw_list]
> # Fill CLI template
> output = cli.prepare_output('list_nets', self.tenant_id,
> dict(networks=networks))
> # Verify!
> # Must add newline at the end to match effect of print call
> self.assertEquals(self.fake_stdout.make_string(), output + '\n')
>
> def test_list_networks(self):
> try:
> cli.list_nets(self.manager, self.tenant_id)
> LOG.debug("Operation completed. Verifying result")
> LOG.debug(self.fake_stdout.content)
> self._verify_list_networks()
> except:
> LOG.exception("Exception caught: %s", sys.exc_info())
> self.fail("test_list_network_api failed due to an exception")
>
>
> def test_list_networks_api(self):
> try:
> cli.api_list_nets(self.client, self.tenant_id)
> LOG.debug("Operation completed. Verifying result")
> LOG.debug(self.fake_stdout.content)
> self._verify_list_networks()
> except:
> LOG.exception("Exception caught: %s", sys.exc_info())
> self.fail("test_list_network_api failed due to an exception")
>
> The code has been already pushed to lp:~netstack/quantum/quantum-unit-tests
>
> By the way, many thanks to the author of the client library for adding an
> option for having a fake connection for testing! It’s a shame I realized it
> after having stubbed out part of do_request J
>
> Cheers,
> Salvatore
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