def test_injector_failure():
# Dataclass wants a value, doesn't have a default, and it
# isn't in props or injector
@dataclass
class AgeAthlete:
age: int # Note that this field is required
props = dict()
injectables = dict()
with pytest.raises(TypeError):
inject(props, injectables, AgeAthlete)
def test_injector_injectedattr_missing_class():
""" Ask for a class not registered as injectable """
class Jersey:
pass
@dataclass
class InjectedAthlete:
shoe_size: int = injected(Jersey, attr='size')
shoe = Shoe(size=88)
props = dict()
injectables = {Shoe.__name__: shoe}
with pytest.raises(InvalidInjectable) as exc:
inject(props, injectables, InjectedAthlete)
expected = 'Invalid injected type Jersey requested from type'
assert expected == str(exc.value)
def test_injector_injected():
""" Create instance from data based on injectables """
shoe = Shoe(size=66)
props = dict()
injectables = {Shoe.__name__: shoe}
athlete = inject(props, injectables, Athlete)
assert 66 == athlete.shoe.size
def test_injector_props():
""" Create instance based on data from passed-in props """
shoe = Shoe(size=55)
props = dict(shoe=shoe)
injectables = dict()
athlete = inject(props, injectables, Athlete)
assert 55 == athlete.shoe.size
def test_injector_precedence():
# When both props and injectable, choose props
shoe = Shoe(size=55)
props = dict(shoe=shoe)
shoe = Shoe(size=66)
injectables = {Shoe.__name__: shoe}
athlete = inject(props, injectables, Athlete)
assert 55 == athlete.shoe.size
def test_injector_injected_double():
""" Tell the injector to hand attribute of another injectable """
@dataclass
class InjectedAthlete:
shoe_size: int = injected(Shoe, attr='size')
shoe = Shoe(size=88)
props = dict()
injectables = {Shoe.__name__: shoe}
athlete = inject(props, injectables, InjectedAthlete)
assert 88 == athlete.shoe_size
def initialize(self):
""" Commit the actions and initialize the registry """
dectate.commit(self.registry)
# Get the injectables
injectables = self.injectables
# Stash ServiceManager stuff in injectables
self.add_injectable(self.config)
self.add_injectable(self)
# Make the Registry injectable using a well-known name
injectables['Registry'] = self.registry
# Make each service config available as injectable
for serviceconfig in self.config.serviceconfigs.values():
self.add_injectable(serviceconfig)
# Get a list of services
q = dectate.Query('service')
services = list(q(self.registry))
# Go through each service, initialize it, then
# put an instance in the service manager
for action, target in services:
# Use injector to make our target class
props = dict()
service = inject(props, injectables, target)
# Store this in our dict of services
name = action.name
self.services[name] = service
# Add this service, and its config, as injectable
self.add_injectable(service)
# TODO Should move more of this to a setup() function in each
# service, to let them provide injectables
if 'resource' in self.services:
resources = self.services['resource'].resources
self.add_injectable(resources)
# Now the adapters in services['adapter']. Each adapter
# can be dependency-injected...albeit carefully. Add the
# (unique) for_ targets as injectable adapters.
try:
for action in AdapterAction.sorted_actions(self.registry):
f = action[0].predicates['for_'].value
self.adapters[f.__name__] = f
except dectate.error.QueryError:
# Likely a unit test that doesn't include adapters in
# the registry
pass
def test_injector_defaultfactory():
# Field has a default value which should be used instead of
# injection
@dataclass
class DefaultValueAthlete:
shoe: Shoe = field(default_factory=Shoe)
props = dict()
injectables = dict()
athlete = inject(props, injectables, DefaultValueAthlete)
assert 77 == athlete.shoe.size
def test_injector_defaultvalue():
# Field has a default value which should be used instead of
# injection
default_shoesize = Shoe(size=34523)
@dataclass
class DefaultValueAthlete:
shoe: Shoe = default_shoesize
props = dict()
injectables = dict()
athlete = inject(props, injectables, DefaultValueAthlete)
assert 34523 == athlete.shoe.size
def test_injector_injected_callable():
""" Tell the injector to hand call result of another injectable """
@dataclass
class CallableShoe:
size: int
def __call__(self):
return self.size + 5
@dataclass
class InjectedAthlete:
shoe_size: int = injected(CallableShoe)
shoe = CallableShoe(size=70)
props = dict()
injectables = {CallableShoe.__name__: shoe}
athlete = inject(props, injectables, InjectedAthlete)
assert 75 == athlete.shoe_size
def get_view(self, request) -> Optional[View]:
""" Use the predicate registry to find the right view class """
# Grab ViewAction and use sorted_actions to find first match
sorted_actions = ViewAction.sorted_actions(self.registry)
# Find the first action which matches the args
for action, view_class in sorted_actions:
if action.all_predicates_match(request):
# Use dependency injection to make an instance of
# that view class
view_instance = inject(
dict(), # props
self.get_injectables(request),
view_class,
request=request
)
return view_instance
# No matches, return None
return None
def get_adapter(self, request, for_: Type[Any],
**kwargs) -> Optional[Adapter]:
""" Use the predicate registry to find the right adapter class """
# Grab AdapterAction and use sorted_actions to find first match
sorted_actions = AdapterAction.sorted_actions(self.registry)
# Find the first action which matches the args
for action, adapter_class in sorted_actions:
if action.all_predicates_match(request, for_=for_, **kwargs):
# Use dependency injection to make an instance of
# that adapter class
adapter_instance = inject(
kwargs, # props
self.get_injectables(request),
adapter_class,
request=request)
return adapter_instance
# No matches, return None
return None
def test_injector_fielddefault():
props = dict()
injectables = dict()
athlete = inject(props, injectables, Athlete)
assert 77 == athlete.shoe.size
