107 lines
3.3 KiB
Python
107 lines
3.3 KiB
Python
"""Core application engine"""
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import os
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import time
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import pkgutil
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import importlib
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import bumblebee.error
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import bumblebee.modules
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def all_modules():
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"""Return a list of available modules"""
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result = []
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path = os.path.dirname(bumblebee.modules.__file__)
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for mod in [name for _, name, _ in pkgutil.iter_modules([path])]:
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result.append({
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"name": mod
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})
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return result
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class Module(object):
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"""Module instance base class
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Objects of this type represent the modules that
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the user configures. Concrete module implementations
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(e.g. CPU utilization, disk usage, etc.) derive from
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this base class.
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"""
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def __init__(self, engine, config={}, widgets=[]):
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self.name = self.__module__.split(".")[-1]
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self._config = config
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if "name" not in self._config:
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self._config["name"] = self.name
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self._widgets = []
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if widgets:
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self._widgets = widgets if isinstance(widgets, list) else [widgets]
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def widgets(self):
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"""Return the widgets to draw for this module"""
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return self._widgets
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def update(self, widgets):
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"""By default, update() is a NOP"""
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pass
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def parameter(self, name, default=None):
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"""Return the config parameter 'name' for this module"""
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name = "{}.{}".format(self._config["name"], name)
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return self._config["config"].get(name, default)
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class Engine(object):
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"""Engine for driving the application
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This class connects input/output, instantiates all
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required modules and drives the "event loop"
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"""
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def __init__(self, config, output=None):
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self._output = output
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self._config = config
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self._running = True
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self._modules = []
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self.load_modules(config.modules())
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def load_modules(self, modules):
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"""Load specified modules and return them as list"""
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for module in modules:
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self._modules.append(self.load_module(module["module"], module["name"]))
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return self._modules
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def load_module(self, module_name, config_name=None):
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"""Load specified module and return it as object"""
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if config_name is None:
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config_name = module_name
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try:
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module = importlib.import_module("bumblebee.modules.{}".format(module_name))
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except ImportError as error:
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raise bumblebee.error.ModuleLoadError(error)
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return getattr(module, "Module")(self, {
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"name": config_name,
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"config": self._config
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})
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def running(self):
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"""Check whether the event loop is running"""
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return self._running
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def stop(self):
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"""Stop the event loop"""
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self._running = False
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def run(self):
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"""Start the event loop"""
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self._output.start()
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while self.running():
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self._output.begin()
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for module in self._modules:
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module.update(module.widgets())
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for widget in module.widgets():
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widget.set_module(module)
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self._output.draw(widget=widget, engine=self)
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self._output.flush()
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self._output.end()
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if self.running():
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time.sleep(1)
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self._output.stop()
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# vim: tabstop=8 expandtab shiftwidth=4 softtabstop=4
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