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|
| from typing import Callable |
|
|
| from .extensions import Extension |
| from .exceptions import ExtensionCallNotFound |
|
|
| __all__ = ['ExtensionInterface'] |
|
|
|
|
| class ExtensionInterface: |
| """ |
| Keeps tracks of active extensions and which calls can be made |
| """ |
|
|
| def __init__(self, substrate): |
| self.substrate = substrate |
| self.extensions = [] |
|
|
| def __len__(self): |
| return len(self.extensions) |
|
|
| def __iter__(self): |
| for item in self.extensions: |
| yield item |
|
|
| def __add__(self, other): |
| self.register(other) |
| return self |
|
|
| def register(self, extension: Extension): |
| """ |
| Register an extension instance to the registry and calls initialization |
| |
| Parameters |
| ---------- |
| extension: Extension |
| |
| Returns |
| ------- |
| |
| """ |
| if not isinstance(extension, Extension): |
| raise ValueError("Provided extension is not a subclass of Extension") |
|
|
| extension.init(self.substrate) |
|
|
| self.extensions.append(extension) |
|
|
| def unregister_all(self): |
| """ |
| Unregister all extensions and free used resources and connections |
| |
| Returns |
| ------- |
| |
| """ |
| for extension in self.extensions: |
| extension.close() |
|
|
| def call(self, name: str, *args, **kwargs): |
| """ |
| Tries to call extension function with `name` and provided args and kwargs |
| |
| Will raise a `ExtensionCallNotFound` when no method is found in current extensions |
| |
| Parameters |
| ---------- |
| name |
| args |
| kwargs |
| |
| Returns |
| ------- |
| |
| """ |
| return self.get_extension_callable(name)(*args, **kwargs) |
|
|
| def get_extension_callable(self, name: str) -> Callable: |
|
|
| for extension in self.extensions: |
| if isinstance(extension, Extension): |
| if hasattr(extension, name): |
| try: |
| |
| self.substrate.debug_message(f"Call '{name}' using extension {extension.__class__.__name__} ...") |
| return getattr(extension, name) |
| except NotImplementedError: |
| pass |
|
|
| raise ExtensionCallNotFound(f"No extension registered that implements call '{name}'") |
|
|
| def __getattr__(self, name): |
| return self.get_extension_callable(name) |
|
|
