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# Copyright (c) 2004 Divmod.
# See LICENSE for details.
from twisted.internet import defer
from nevow import context, inevow
from nevow import testutil
from nevow.flat import twist
from nevow.util import Deferred
from nevow import rend, loaders, tags
def deferit(data):
return data.d
def deferdot(data):
return data.d2
class RenderHelper(testutil.TestCase):
def renderIt(self):
req = testutil.FakeRequest()
self.r.renderHTTP(context.PageContext(tag=self.r, parent=context.RequestContext(tag=req)))
return req
class LaterRenderTest(RenderHelper):
def setUp(self):
self.d = Deferred()
self.d2 = Deferred()
self.r = rend.Page(
docFactory=loaders.stan(
tags.html(data=self)[
'Hello ', tags.invisible[tags.invisible[tags.invisible[tags.invisible[deferit]]]],
deferdot,
]
)
)
def test_deferredSupport(self):
req = self.renderIt()
self.assertEquals(req.v, '<html>Hello ')
self.d.callback("world")
self.assertEquals(req.v, '<html>Hello world')
self.d2.callback(".")
self.assertEquals(req.v, '<html>Hello world.</html>')
def test_deferredSupport2(self):
req = self.renderIt()
self.assertEquals(req.v, '<html>Hello ')
self.d2.callback(".")
self.assertEquals(req.v, '<html>Hello ')
self.d.callback("world")
self.assertEquals(req.v, '<html>Hello world.</html>')
def test_deferredSupport3(self):
self.r.buffered = True
req = self.renderIt()
self.assertEquals(req.v, '')
self.d.callback("world")
self.assertEquals(req.v, '')
self.d2.callback(".")
self.assertEquals(req.v, '<html>Hello world.</html>')
def test_renderNestedDeferredCallables(self):
"""
Test flattening of a renderer which returns a Deferred which fires with
a renderer which returns a Deferred.
"""
def render_inner(ctx, data):
return defer.succeed('')
def render_outer(ctx, data):
return defer.succeed(render_inner)
ctx = context.WovenContext()
ctx.remember(None, inevow.IData)
out = []
d = twist.deferflatten(render_outer, ctx, out.append)
def flattened(ign):
self.assertEquals(out, [''])
d.addCallback(flattened)
return d
def test_renderNestedDeferredErrorHandling(self):
"""
Test that flattening a renderer which returns a Deferred which fires
with a renderer which raises an exception causes the outermost Deferred
to errback.
"""
class NestedException(Exception):
pass
def render_inner(ctx, data):
raise NestedException()
def render_outer(ctx, data):
return defer.succeed(render_inner)
ctx = context.WovenContext()
ctx.remember(None, inevow.IData)
out = []
d = twist.deferflatten(render_outer, ctx, out.append)
return self.assertFailure(d, NestedException)
class LaterDataTest(RenderHelper):
def data_later(self, context, data):
return self.d
def data_later2(self, context, data):
return self.d2
def setUp(self):
self.d = Deferred()
self.d2 = Deferred()
self.r = rend.Page(docFactory=loaders.stan(
tags.html(data=self.data_later)[
'Hello ', str, ' and '
'goodbye ',str,
tags.span(data=self.data_later2, render=str)]))
def test_deferredSupport(self):
req = self.renderIt()
self.assertEquals(req.v, '')
self.d.callback("world")
self.assertEquals(req.v, '<html>Hello world and goodbye world')
self.d2.callback(".")
self.assertEquals(req.v, '<html>Hello world and goodbye world.</html>')
class SuperLaterDataTest(RenderHelper):
def test_reusedDeferredSupport(self):
"""
Two occurrences of a particular slot are each replaced with the
result of the Deferred which is used to fill that slot.
"""
doc = tags.html[
tags.slot('foo'), tags.slot('foo')]
doc.fillSlots('foo', defer.succeed(tags.span['Foo!!!']))
self.r = rend.Page(docFactory=loaders.stan(doc))
req = self.renderIt()
self.assertEquals(req.v, '<html><span>Foo!!!</span><span>Foo!!!</span></html>')
def test_rendererCalledOnce(self):
"""
Make sure that if a Deferred fires with a render function that the
render function is called only once.
"""
calls = []
def recorder(ctx, data):
calls.append(None)
return str(len(calls))
doc = tags.html[tags.directive('renderer')]
class RendererPage(rend.Page):
docFactory = loaders.stan(doc)
def render_renderer(self, ctx, data):
return defer.succeed(recorder)
self.r = RendererPage()
req = self.renderIt()
self.assertEquals(req.v, '<html>1</html>')
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