def _has_mpl_attrs_post_init()

in src/aws_encryption_sdk/streaming_client.py [0:0]

• 25 lines of code
• 9 McCabe index (conditional complexity)

    def _has_mpl_attrs_post_init(self):
        """If the MPL is present in the runtime, perform MPL-specific post-init logic
        to validate the new object has a valid state.
        """
        if not exactly_one_arg_is_not_none(self.materials_manager, self.key_provider, self.keyring):
            raise TypeError("Exactly one of keyring, materials_manager, or key_provider must be provided")
        if self.materials_manager is None:
            if self.key_provider is not None:
                # No CMM, provided legacy native `key_provider` => create legacy native DefaultCryptoMaterialsManager
                self.materials_manager = DefaultCryptoMaterialsManager(
                    master_key_provider=self.key_provider
                )
            elif self.keyring is not None:
                try:
                    mat_prov: AwsCryptographicMaterialProviders = AwsCryptographicMaterialProviders(
                        config=MaterialProvidersConfig()
                    )
                    cmm = mat_prov.create_default_cryptographic_materials_manager(
                        CreateDefaultCryptographicMaterialsManagerInput(
                            keyring=self.keyring
                        )
                    )
                    cmm_handler: CryptoMaterialsManager = CryptoMaterialsManagerFromMPL(cmm)
                    self.materials_manager = cmm_handler
                except AwsCryptographicMaterialProvidersException as mpl_exception:
                    # Wrap MPL error into the ESDK error type
                    # so customers only have to catch ESDK error types.
                    raise AWSEncryptionSDKClientError(mpl_exception)

        # If the provided materials_manager is directly from the MPL, wrap it in a native interface
        # for internal use.
        elif (self.materials_manager is not None
              and isinstance(self.materials_manager, MPL_ICryptographicMaterialsManager)):
            self.materials_manager = CryptoMaterialsManagerFromMPL(self.materials_manager)