def get_backend(cls):
from eth_keys.backends import get_backend
if cls._backend is None:
return get_backend()
else:
return cls._backend
def backend(self):
from eth_keys.backends import get_backend
if self._backend is None:
return get_backend()
else:
return self._backend
def get_backend(cls):
# type: () -> BaseECCBackend
from eth_keys.backends import get_backend
if cls._backend is None:
return get_backend()
else:
return cls._backend
def backend(self):
# type: () -> BaseECCBackend
from eth_keys.backends import get_backend
if self._backend is None:
return get_backend()
else:
return self._backend
def __init__(self, backend=None):
if backend is None:
pass
elif isinstance(backend, BaseECCBackend):
pass
elif isinstance(backend, type) and issubclass(backend, BaseECCBackend):
backend = backend()
elif is_string(backend):
backend = get_backend(backend)
else:
raise ValueError(
"Unsupported format for ECC backend. Must be an instance or "
"subclass of `eth_keys.backends.BaseECCBackend` or a string of "
"the dot-separated import path for the desired backend class")
self.backend = backend
def get_backend(cls, *args: Any, **kwargs: Any) -> 'BaseECCBackend':
from eth_keys.backends import get_backend
return get_backend(*args, **kwargs)
def backend(self):
if self._backend is None:
return get_backend()
else:
return self._backend
