117 lines
3.9 KiB
Python
117 lines
3.9 KiB
Python
# Copyright 2017 New Vector Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import importlib
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import importlib.util
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import itertools
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from types import ModuleType
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from typing import Any, Iterable, Tuple, Type
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import jsonschema
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from synapse.config._base import ConfigError
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from synapse.config._util import json_error_to_config_error
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def load_module(provider: dict, config_path: Iterable[str]) -> Tuple[Type, Any]:
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"""Loads a synapse module with its config
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Args:
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provider: a dict with keys 'module' (the module name) and 'config'
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(the config dict).
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config_path: the path within the config file. This will be used as a basis
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for any error message.
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Returns
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Tuple of (provider class, parsed config object)
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"""
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modulename = provider.get("module")
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if not isinstance(modulename, str):
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raise ConfigError(
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"expected a string", path=itertools.chain(config_path, ("module",))
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)
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# We need to import the module, and then pick the class out of
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# that, so we split based on the last dot.
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module_name, clz = modulename.rsplit(".", 1)
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module = importlib.import_module(module_name)
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provider_class = getattr(module, clz)
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# Load the module config. If None, pass an empty dictionary instead
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module_config = provider.get("config") or {}
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if hasattr(provider_class, "parse_config"):
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try:
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provider_config = provider_class.parse_config(module_config)
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except jsonschema.ValidationError as e:
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raise json_error_to_config_error(
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e, itertools.chain(config_path, ("config",))
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)
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except ConfigError as e:
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raise _wrap_config_error(
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"Failed to parse config for module %r" % (modulename,),
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prefix=itertools.chain(config_path, ("config",)),
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e=e,
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)
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except Exception as e:
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raise ConfigError(
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"Failed to parse config for module %r" % (modulename,),
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path=itertools.chain(config_path, ("config",)),
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) from e
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else:
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provider_config = module_config
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return provider_class, provider_config
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def load_python_module(location: str) -> ModuleType:
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"""Load a python module, and return a reference to its global namespace
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Args:
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location: path to the module
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Returns:
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python module object
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"""
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spec = importlib.util.spec_from_file_location(location, location)
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if spec is None:
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raise Exception("Unable to load module at %s" % (location,))
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mod = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(mod) # type: ignore
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return mod
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def _wrap_config_error(
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msg: str, prefix: Iterable[str], e: ConfigError
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) -> "ConfigError":
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"""Wrap a relative ConfigError with a new path
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This is useful when we have a ConfigError with a relative path due to a problem
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parsing part of the config, and we now need to set it in context.
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"""
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path = prefix
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if e.path:
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path = itertools.chain(prefix, e.path)
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e1 = ConfigError(msg, path)
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# ideally we would set the 'cause' of the new exception to the original exception;
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# however now that we have merged the path into our own, the stringification of
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# e will be incorrect, so instead we create a new exception with just the "msg"
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# part.
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e1.__cause__ = Exception(e.msg)
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e1.__cause__.__cause__ = e.__cause__
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return e1
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