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Pass a dict, instead of None, to modules if a None config is specified in the homeserver config (#9229)

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If a Synapse module's config block were empty in YAML, thus being translated to a `Nonetype` in Python, then some modules could fail as that None ends up getting passed to their `parse_config` method. Modules are expected to accept a `dict` instead.

This PR ensures that if the user does end up specifying an empty config block (such as what [the default oidc config in the sample config](5310808d3b/docs/sample_config.yaml (L1816-L1845)) states) then `None` is not passed to the module. An empty dict is passed instead.

This code assumes that no existing modules are relying on receiving a `None` config block, but I'd really hope that they aren't.
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Andrew Morgan 2021-01-27 11:49:31 +00:00 committed by GitHub
parent 1baab20352
commit a64c29926e
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changelog.d/9229.bugfix Normal file
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@ -0,0 +1 @@
Fix a bug where `None` was passed to Synapse modules instead of an empty dictionary if an empty module `config` block was provided in the homeserver config.

3
synapse/util/module_loader.py
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@ -49,7 +49,8 @@ def load_module(provider: dict, config_path: Iterable[str]) -> Tuple[Type, Any]:
module = importlib.import_module(module)
provider_class = getattr(module, clz)
module_config = provider.get("config")
# Load the module config. If None, pass an empty dictionary instead
module_config = provider.get("config") or {}
try:
provider_config = provider_class.parse_config(module_config)
except jsonschema.ValidationError as e: