def test_fallback_to_fallback():
def fallback(obj):
return 'fallback!'
@dispatch(match_instance('obj', lambda obj: obj,
fallback=fallback))
def target(obj):
return 'not the fallback we want'
reg = Registry()
def specific_target(obj):
return 'specific'
reg.register_dispatch(target)
reg.register_function(target, specific_target, obj=Alpha)
beta = Beta()
assert target(beta, lookup=reg.lookup()) == 'fallback!'
# this is *not* a registered fallback so won't be returned here
assert target.fallback(beta, lookup=reg.lookup()) is fallback
# we cannot find a fallback for alpha, as it doesn't hit the fallback
assert target(Alpha(), lookup=reg.lookup()) == 'specific'
assert target.fallback(Alpha(), lookup=reg.lookup()) is NOT_FOUND
def test_component_inheritance_old_style_class():
reg = Registry()
class Gamma:
pass
class Delta(Gamma):
pass
@dispatch('obj')
def target(obj):
pass
def foo(obj):
pass
reg.register_dispatch(target)
reg.register_function(target, foo, obj=Gamma)
gamma = Gamma()
delta = Delta()
lookup = reg.lookup()
assert target.component(gamma, lookup=lookup) is foo
# inheritance case
assert target.component(delta, lookup=lookup) is foo
def test_register_no_external_predicates_for_external():
@dispatch_external_predicates()
def foo():
pass
r = Registry()
with pytest.raises(RegistrationError):
r.register_dispatch(foo)
def test_lookup_passed_along_fallback():
@dispatch()
def a(lookup):
return "fallback"
reg = Registry()
reg.register_dispatch(a)
assert a(lookup=reg.lookup()) == 'fallback'
def test_call_not_found_no_sources():
reg = Registry()
@dispatch()
def target():
return "default"
reg.register_dispatch(target)
lookup = reg.lookup()
assert target(lookup=lookup) == "default"
def test_component_not_found_no_sources():
reg = Registry()
@dispatch()
def target():
pass
reg.register_dispatch(target)
lookup = reg.lookup()
assert target.component(lookup=lookup) is None
def test_non_callable_registered():
reg = Registry()
@dispatch('obj')
def target(obj):
pass
non_callable = None
reg.register_dispatch(target)
with pytest.raises(RegistrationError):
reg.register_function(target, non_callable, a=Alpha)
def test_call_not_found_two_sources():
reg = Registry()
@dispatch('a', 'b')
def target(a, b):
return "a: %s b: %s" % (a, b)
reg.register_dispatch(target)
lookup = reg.lookup()
assert target('dummy1', 'dummy2', lookup=lookup) == "a: dummy1 b: dummy2"
def test_component_not_found_two_sources():
reg = Registry()
@dispatch('a', 'b')
def target(a, b):
pass
reg.register_dispatch(target)
lookup = reg.lookup()
assert target.component('dummy', 'dummy', lookup=lookup) is None
def test_call_not_found_one_source():
reg = Registry()
@dispatch('obj')
def target(obj):
return "default: %s" % obj
reg.register_dispatch(target)
lookup = reg.lookup()
assert target('dummy', lookup=lookup) == 'default: dummy'
def test_component_not_found_one_source():
reg = Registry()
@dispatch('obj')
def target(obj):
pass
reg.register_dispatch(target)
lookup = reg.lookup()
assert target.component('dummy', lookup=lookup) is None
def test_wrong_callable_registered():
reg = Registry()
@dispatch('obj')
def target(obj):
pass
def callable(a, b):
pass
reg.register_dispatch(target)
with pytest.raises(RegistrationError):
reg.register_function(target, callable, a=Alpha)
def test_key_dict_to_predicate_key_unknown_keys():
r = Registry()
@dispatch(
key_predicate('foo', default='default foo'),
key_predicate('bar', default='default bar'))
def view(self, request):
raise NotImplementedError()
r.register_dispatch(view)
# unknown keys are just ignored
r.key_dict_to_predicate_key(view.wrapped_func, {
'unknown': 'blah'})
def test_call_no_source():
reg = Registry()
foo = object()
@dispatch()
def target():
pass
def factory():
return foo
reg.register_dispatch(target)
reg.register_function(target, factory)
assert target(lookup=reg.lookup()) is foo
def test_implicit_component_lookup():
@dispatch()
def func():
pass
def foo():
pass
reg = Registry()
reg.register_dispatch(func)
reg.register_function(func, foo)
implicit.initialize(reg.lookup())
assert func.component() is foo
def test_different_defaults_in_specific_non_dispatch_arg():
@dispatch('obj')
def target(obj, blah='default'):
return 'fallback: %s' % blah
reg = Registry()
def a(obj, blah='default 2'):
return 'a: %s' % blah
reg.register_dispatch(target)
reg.register_function(target, a, obj=Alpha)
lookup = reg.lookup()
assert target(Alpha(), lookup=lookup) == 'a: default 2'
def test_component_two_sources():
reg = Registry()
@dispatch('a', 'b')
def target(a, b):
pass
def foo(a, b):
pass
reg.register_dispatch(target)
reg.register_function(target, foo, a=IAlpha, b=IBeta)
alpha = Alpha()
beta = Beta()
assert target.component(alpha, beta, lookup=reg.lookup()) is foo
def test_key_dict_to_predicate_key():
r = Registry()
@dispatch(
key_predicate('foo', default='default foo'),
key_predicate('bar', default='default bar'))
def view(self, request):
raise NotImplementedError()
r.register_dispatch(view)
assert r.key_dict_to_predicate_key(view.wrapped_func, {
'foo': 'FOO',
'bar': 'BAR'}) == ('FOO', 'BAR')
assert r.key_dict_to_predicate_key(view.wrapped_func, {}) == (
'default foo',
'default bar')
def test_fallback_to_dispatch():
@dispatch('obj')
def target(obj):
return 'fallback'
reg = Registry()
def specific_target(obj):
return 'specific'
reg.register_dispatch(target)
reg.register_function(target, specific_target, obj=Alpha)
beta = Beta()
assert target(beta, lookup=reg.lookup()) == 'fallback'
# this is *not* a registered fallback so won't be returned here
assert target.fallback(beta, lookup=reg.lookup()) is None
def test_different_defaults_in_specific_dispatch_arg_causes_dispatch():
@dispatch(match_key('key', lambda key: key))
def target(key='foo'):
return 'fallback: %s' % key
reg = Registry()
def a(key='default 2'):
return 'a: %s' % key
reg.register_dispatch(target)
reg.register_function(target, a, key='foo')
lookup = reg.lookup()
assert target('foo', lookup=lookup) == 'a: foo'
assert target('bar', lookup=lookup) == 'fallback: bar'
assert target(lookup=lookup) == 'a: default 2'
def test_register_dispatch_key_dict():
r = Registry()
class Foo(object):
pass
class FooSub(Foo):
pass
@dispatch_external_predicates()
def view(self, request):
raise NotImplementedError()
def get_model(self):
return self
def get_name(request):
return request.name
def get_request_method(request):
return request.request_method
def model_fallback(self, request):
return "Model fallback"
def name_fallback(self, request):
return "Name fallback"
def request_method_fallback(self, request):
return "Request method fallback"
r.register_external_predicates(view, [
match_instance('model', get_model, model_fallback,
default=None),
match_key('name', get_name, name_fallback,
default=''),
match_key('request_method', get_request_method,
request_method_fallback,
default='GET')])
r.register_dispatch(view)
assert r.key_dict_to_predicate_key(
view.wrapped_func, {}) == (None, '', 'GET')
def test_call_one_source():
reg = Registry()
@dispatch('obj')
def target(obj):
pass
def foo(obj):
return "foo"
def bar(obj):
return "bar"
reg.register_dispatch(target)
reg.register_function(target, foo, obj=IAlpha)
reg.register_function(target, bar, obj=IBeta)
lookup = reg.lookup()
assert target(Alpha(), lookup=lookup) == 'foo'
assert target(Beta(), lookup=lookup) == 'bar'
def test_call_with_wrong_args():
@dispatch('obj')
def target(obj):
pass
def specific(obj):
return "specific"
reg = Registry()
reg.register_dispatch(target)
reg.register_function(target, specific, obj=Alpha)
lookup = reg.lookup()
# we are not allowed to call target without arguments
with pytest.raises(TypeError):
target(wrong=1, lookup=lookup)
with pytest.raises(KeyExtractorError):
target.component(wrong=1, lookup=lookup)
def test_component_inheritance():
reg = Registry()
class Gamma(object):
pass
class Delta(Gamma):
pass
@dispatch('obj')
def target(obj):
pass
def foo(obj):
pass
reg.register_dispatch(target)
reg.register_function(target, foo, obj=Gamma)
delta = Delta()
assert target.component(delta, lookup=reg.lookup()) is foo
def test_calling_twice():
@dispatch('obj')
def target(obj):
return 'fallback'
reg = Registry()
def a(obj):
return 'a'
def b(obj):
return 'b'
reg.register_dispatch(target)
reg.register_function(target, a, obj=Alpha)
reg.register_function(target, b, obj=Beta)
lookup = reg.lookup()
assert target(Alpha(), lookup=lookup) == 'a'
assert target(Beta(), lookup=lookup) == 'b'
def test_extra_arg_for_call():
@dispatch('obj')
def target(obj, extra):
return "General: %s" % extra
reg = Registry()
def specific(obj, extra):
return "Specific: %s" % extra
reg.register_dispatch(target)
reg.register_function(target, specific, obj=Alpha)
alpha = Alpha()
beta = Beta()
lookup = reg.lookup()
assert target(alpha, lookup=lookup, extra="allowed") == 'Specific: allowed'
assert target(beta, lookup=lookup, extra="allowed") == 'General: allowed'
assert target(alpha, 'allowed', lookup=lookup) == 'Specific: allowed'
assert target(beta, 'allowed', lookup=lookup) == 'General: allowed'
def test_call_two_sources():
reg = Registry()
@dispatch('a', 'b')
def target(a, b):
pass
def foo(a, b):
return "foo"
def bar(a, b):
return "bar"
reg.register_dispatch(target)
reg.register_function(target, foo, a=IAlpha, b=IBeta)
reg.register_function(target, bar, a=IBeta, b=IAlpha)
alpha = Alpha()
beta = Beta()
lookup = reg.lookup()
assert target(alpha, beta, lookup=lookup) == 'foo'
assert target(beta, alpha, lookup=lookup) == 'bar'
def test_lookup_passed_along():
@dispatch('obj')
def g1(obj):
pass
@dispatch('obj')
def g2(obj):
pass
reg = Registry()
def g1_impl(obj, lookup):
return g2(obj, lookup=lookup)
def g2_impl(obj):
return "g2"
reg.register_dispatch(g1)
reg.register_dispatch(g2)
reg.register_function(g1, g1_impl, obj=Alpha)
reg.register_function(g2, g2_impl, obj=Alpha)
assert g1(Alpha(), lookup=reg.lookup()) == 'g2'
