def _get_transport_pool(self,
api_name: str,
transport_type: str,
default=empty) -> AnyTransportPoolType:
# Get the registry entry for this API (if any)
registry_entry = self._registry.get(api_name)
api_transport = None
# If we have a registry entry for this API, then get the transport for it
if registry_entry:
api_transport = getattr(registry_entry, transport_type)
# Otherwise get the transport for the default API (which is always our fallback)
# (but don't bother if they have explicity asked for the default_api, as if they
# have then we've already failed to get that in the previous step)
if not api_transport and api_name != "default":
try:
api_transport = self._get_transport_pool(
"default", transport_type)
except TransportNotFound:
pass
# If we STILL don't have a transport then show a sensible error
if not api_transport and default == empty:
raise TransportNotFound(
f"No {transport_type} transport found for API '{api_name}'. Neither was a default "
f"API transport found. Either specify a {transport_type} transport for this specific API, "
f"or specify a default {transport_type} transport. In most cases setting a default transport "
f"is the best course of action.")
else:
return api_transport
def get_transport(type_, name):
for name_, class_ in get_available_transports(type_).items():
if name == name_:
return class_
raise TransportNotFound(
f"No '{type_}' transport found named '{name}'. Check the transport is installed and "
f"has the relevant entrypoints setup in it's setup.py file. Or perhaps "
f"you have a typo in your config file.")
def get_schema_transport(self, default=empty) -> SchemaTransportPoolType:
if self.schema_transport or default != empty:
return self.schema_transport or default
else:
# TODO: Link to docs
raise TransportNotFound(
"No schema transport is configured for this bus. Check your schema transport "
"configuration is setup correctly (config section: bus.schema.transport)."
)
def get_transport_name(cls: Type["Transport"]):
for type_ in ("rpc", "result", "event"):
for *_, name, class_ in load_entrypoint_classes(f"lightbus_{type_}_transports"):
if cls == class_:
return name
raise TransportNotFound(
f"Transport class {cls.__module__}.{cls.__name__} is not specified in any entrypoint."
)
def _get_transport(self, api_name: str, transport_type: str, default=empty):
registry_entry = self._registry.get(api_name)
api_transport = None
if registry_entry:
api_transport = getattr(registry_entry, transport_type)
if not api_transport and api_name != "default":
try:
api_transport = self._get_transport("default", transport_type)
except TransportNotFound:
pass
if not api_transport and default == empty:
raise TransportNotFound(
f"No {transport_type} transport found for API '{api_name}'. Neither was a default "
f"API transport found. Either specify a {transport_type} transport for this specific API, "
f"or specify a default {transport_type} transport. In most cases setting a default transport "
f"is the best course of action."
)
else:
return api_transport
