197 lines
7.3 KiB
Python
197 lines
7.3 KiB
Python
import gc, glob, imp, io, inspect, os, sys, typing, uuid
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from src import Config, EventManager, Exports, IRCBot, Logging, Timers, utils
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class ModuleException(Exception):
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pass
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class ModuleWarning(Exception):
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pass
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class ModuleNotFoundException(ModuleException):
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pass
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class ModuleNameCollisionException(ModuleException):
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pass
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class ModuleLoadException(ModuleException):
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pass
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class ModuleUnloadException(ModuleException):
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pass
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class ModuleNotLoadedWarning(ModuleWarning):
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pass
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class BaseModule(object):
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def __init__(self,
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bot: "IRCBot.Bot",
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events: EventManager.EventHook,
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exports: Exports.Exports,
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timers: Timers.Timers,
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log: Logging.Log):
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self.bot = bot
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self.events = events
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self.exports = exports
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self.timers = timers
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self.log = log
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self.on_load()
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def on_load(self):
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pass
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def unload(self):
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pass
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class LoadedModule(object):
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def __init__(self,
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name: str,
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module: BaseModule,
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context: str,
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import_name: str):
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self.name = name
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self.module = module
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self.context = context
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self.import_name = import_name
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class ModuleManager(object):
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def __init__(self,
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events: EventManager.EventHook,
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exports: Exports.Exports,
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timers: Timers.Timers,
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config: Config.Config,
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log: Logging.Log,
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directory: str):
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self.events = events
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self.exports = exports
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self.config = config
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self.timers = timers
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self.log = log
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self.directory = directory
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self.modules = {} # type: typing.Dict[str, LoadedModule]
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self.waiting_requirement = {} # type: typing.Dict[str, typing.Set[str]]
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def list_modules(self) -> typing.List[str]:
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return sorted(glob.glob(os.path.join(self.directory, "*.py")))
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def _module_name(self, path: str) -> str:
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return os.path.basename(path).rsplit(".py", 1)[0].lower()
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def _module_path(self, name: str) -> str:
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return os.path.join(self.directory, "%s.py" % name)
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def _import_name(self, name: str) -> str:
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return "bitbot_%s" % name
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def _get_magic(self, obj: typing.Any, magic: str, default: typing.Any
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) -> typing.Any:
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return getattr(obj, magic) if hasattr(obj, magic) else default
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def _load_module(self, bot: "IRCBot.Bot", name: str) -> LoadedModule:
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path = self._module_path(name)
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for hashflag, value in utils.parse.hashflags(path):
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if hashflag == "ignore":
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# nope, ignore this module.
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raise ModuleNotLoadedWarning("module ignored")
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elif hashflag == "require-config" and value:
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if not self.config.get(value.lower(), None):
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# nope, required config option not present.
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raise ModuleNotLoadedWarning("required config not present")
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elif hashflag == "require-module" and value:
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requirement = value.lower()
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if not requirement in self.modules:
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if not requirement in self.waiting_requirement:
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self.waiting_requirement[requirement] = set([])
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self.waiting_requirement[requirement].add(path)
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raise ModuleNotLoadedWarning("waiting for requirement")
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import_name = self._import_name(name)
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module = imp.load_source(import_name, path)
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module_object_pointer = getattr(module, "Module", None)
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if not module_object_pointer:
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raise ModuleLoadException("module '%s' doesn't have a "
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"'Module' class." % name)
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if not inspect.isclass(module_object_pointer):
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raise ModuleLoadException("module '%s' has a 'Module' attribute "
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"but it is not a class." % name)
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context = str(uuid.uuid4())
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context_events = self.events.new_context(context)
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context_exports = self.exports.new_context(context)
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context_timers = self.timers.new_context(context)
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module_object = module_object_pointer(bot, context_events,
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context_exports, context_timers, self.log)
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if not hasattr(module_object, "_name"):
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module_object._name = name.title()
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for attribute_name in dir(module_object):
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attribute = getattr(module_object, attribute_name)
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for hook in self._get_magic(attribute,
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utils.consts.BITBOT_HOOKS_MAGIC, []):
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context_events.on(hook["event"]).hook(attribute,
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**hook["kwargs"])
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for export in self._get_magic(module_object,
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utils.consts.BITBOT_EXPORTS_MAGIC, []):
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context_exports.add(export["setting"], export["value"])
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if name in self.modules:
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raise ModuleNameCollisionException("Module name '%s' "
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"attempted to be used twice")
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return LoadedModule(name, module_object, context, import_name)
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def load_module(self, bot: "IRCBot.Bot", name: str):
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try:
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loaded_module = self._load_module(bot, name)
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except ModuleWarning as warning:
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self.log.warn("Module '%s' not loaded", [name])
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raise
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except Exception as e:
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self.log.error("Failed to load module \"%s\": %s",
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[name, str(e)])
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raise
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self.modules[loaded_module.name] = loaded_module
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if loaded_module.name in self.waiting_requirement:
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for requirement_name in self.waiting_requirement[
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loaded_module.name]:
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self.load_module(bot, requirement_name)
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self.log.debug("Module '%s' loaded", [loaded_module.name])
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def load_modules(self, bot: "IRCBot.Bot", whitelist: typing.List[str]=[],
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blacklist: typing.List[str]=[]):
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for path in self.list_modules():
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name = self._module_name(path)
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if name in whitelist or (not whitelist and not name in blacklist):
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try:
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self.load_module(bot, name)
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except ModuleWarning:
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pass
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def unload_module(self, name: str):
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if not name in self.modules:
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raise ModuleNotFoundException()
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loaded_module = self.modules[name]
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if hasattr(loaded_module.module, "unload"):
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try:
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loaded_module.module.unload()
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except:
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pass
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del self.modules[loaded_module.name]
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context = loaded_module.context
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self.events.purge_context(context)
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self.exports.purge_context(context)
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self.timers.purge_context(context)
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module = loaded_module.module
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del loaded_module.module
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del sys.modules[loaded_module.import_name]
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references = sys.getrefcount(module)
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referrers = gc.get_referrers(module)
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del module
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references -= 1 # 'del module' removes one reference
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references -= 1 # one of the refs is from getrefcount
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self.log.debug("Module '%s' unloaded (%d reference%s)",
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[loaded_module.name, references,
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"" if references == 1 else "s"])
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if references > 0:
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self.log.debug("References left for '%s': %s",
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[loaded_module.name,
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", ".join([str(referrer) for referrer in referrers])])
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