The WoobBase class

class WoobBase(modules_path: Optional[str] = None, storage: Optional[IStorage] = None, scheduler: Optional[IScheduler] = None)

Bases: object

Woob class to load modules from a specific path, without deal with woob remote repositories.

It provides methods to build backends or call methods on all loaded backends.

You should use this class when you want to build an application using Woob as a library, without using the standard modules nor the automatic module download and update machanism. When using WoobBase, you have to explicitely provide module paths and deal yourself with backend configuration.

Parameters

• modules_path (str) – path to directory containing modules.

• storage (woob.tools.storage.IStorage) – provide a storage where backends can save data

• scheduler (woob.core.scheduler.IScheduler) – what scheduler to use; default is woob.core.scheduler.Scheduler

deinit()

Call this method when you stop using Woob, to properly unload all correctly.

build_modules_loader() → ModulesLoader

Build the module loader for the current application.

This can be overridden by children to avoid overriding an already existing modules loader.

Return type

ModulesLoader

build_backend(module_name: str, params: Optional[dict] = None, storage: Optional[IStorage] = None, name: Optional[str] = None, nofail: bool = False, logger: Logger = None) → Module

Create a backend.

It does not load it into the Woob object, so you are responsible for deinitialization and calls.

Parameters

• module_name – name of module

• params (dict) – parameters to give to backend

• storage (woob.tools.storage.IStorage) – storage to use

• name (str) – name of backend

• nofail (bool) – if true, this call can’t fail

• logger (logging.Logger) – logger to use

Return type

woob.tools.backend.Module

exception LoadError(backend_name: str, exception: Exception)

Bases: Exception

Raised when a backend is unabled to load.

Parameters

• backend_name – name of backend we can’t load

• exception – exception object

load_backend(module_name: str, name: str, params: Optional[dict] = None, storage: IStorage = None, nofail: bool = False)

Load a backend.

Parameters

• module_name (str:) – name of module to load

• name (str) – name of instance

• params (dict) – parameters to give to backend

• storage (woob.tools.storage.IStorage) – storage to use

• nofail (bool) – if true, this call can’t fail

Return type

woob.tools.backend.Module

unload_backends(names: Optional[List[str]] = None) → Dict[str, Module]

Unload backends.

Parameters

names (list) – if specified, only unload that backends

get_backend(name: str, **kwargs) → Module

Get a backend from its name.

Parameters

• name (str) – name of backend to get

• default (whatever you want) – if specified, get this value when the backend is not found

Raises

KeyError if not found.

count_backends() → int

Get number of loaded backends.

iter_backends(caps: Optional[List[Capability]] = None, module: Optional[str] = None)

Iter on each backends.

Note: each backend is locked when it is returned.

Parameters

• caps (tuple[woob.capabilities.base.Capability]) – optional list of capabilities to select backends

• module (str) – optional name of module

Return type

iter[woob.tools.backend.Module]

do(function: Union[Callable, str], *args, **kwargs) → BackendsCall

Do calls on loaded backends with specified arguments, in separated threads.

This function has two modes:

• If function is a string, it calls the method with this name on each backends with the specified arguments;

• If function is a callable, it calls it in a separated thread with the locked backend instance at first arguments, and *args and **kwargs.

Parameters

• function (str) – backend’s method name, or a callable object

• backends (list[str]) – list of backends to iterate on

• caps (list[woob.capabilities.base.Capability]) – iterate on backends which implement this caps

Return type

A woob.core.bcall.BackendsCall object (iterable)

schedule(interval: int, function: Callable, *args) → Optional[int]

Schedule an event.

Parameters

• interval (int) – delay before calling the function

• function (callabale) – function to call

• args – arguments to give to function

Returns

an event identificator

repeat(interval: int, function: Callable, *args) → Optional[int]

Repeat a call to a function

Parameters

• interval (int) – interval between two calls

• function (callable) – function to call

• args – arguments to give to function

Returns

an event identificator

cancel(ev: int) → bool

Cancel an event

Parameters

ev – the event identificator

want_stop() → None

Plan to stop the scheduler.

loop()

Run the scheduler loop

load_or_install_module(module_name: str) → Module

Load a backend, but can’t install it