from dataclasses import dataclass from pathlib import Path class Plugin: """Base class for the bot plugins. This class provides a lot of tools to facilitate the implementation of plugins. Callbacks for all events handled by the IRC library can be implemented here (if the Bot class supports it). Most bot features are put in plugins to avoid cluttering the Bot class, and no plugins should be required for the bot to run; plugins can depend on each other though. A plugin loads his basic information from the config file. It can use the bot's runtime values facilities to make runtime values available to other plugins. It can also save data using the Bot's storage feature to be available after a restart. Initalisation should be very fast, no network connections or anything. They are initialised before connecting to the server, so their `is_ready` flag is set at that point. The loading order is more or less random, so a plugin cannot assume another has been loaded during initialisation. If it wants to interact with another plugin, the earliest point to do that is in the on_welcome callback which is called after connecting to a server, and can disable itself by setting its own `is_ready` flag to false. A plugin can access its config once the base `__init__` has been called. The configuration is valid only is `is_ready` is True, else accessing its content is undefined behaviour. Plugins can have priorities and calling their callbacks will respect it. For now these levels are used: - 0: default - -3: low, misc parsing of messages, answer to various messages - -8: handling of unknown commands - -9: handling of unknown questions - -10: lowest, e.g. for random reactions usually with a very low rate """ REQUIRED_CONFIGS = [] def __init__(self, bot): self.bot = bot self.name = self.__class__.__name__.lower()[:-6] # Remove "Plugin". self.priority = 0 self.config = self.__get_config() self.is_ready = self.__check_config() @property def callbacks(self): """List of callback types available for this plugin.""" return { cb[3:]: getattr(self, cb) for cb in dir(self) if cb.startswith("on_") and callable(getattr(self, cb)) } def __get_config(self): """Return the plugin section from the bot config, plus common values.""" plugins_configs = self.bot.config["plugins"] config = plugins_configs["common"].copy() config.update(plugins_configs.get(self.name, {})) # Load resources as config values. resources_dir = self.bot.config["resources_dir"] for key, resource_path in config.get("resources", {}).items(): resource_path = Path(resources_dir) / resource_path try: with open(resource_path, "rt") as resource_file: config[key] = [l.strip() for l in resource_file.readlines()] except OSError: self.bot.log_e(f"Could not load resource at {resource_path}.") return config def __check_config(self): """Return True if the plugin config is properly setup.""" missing = False for key in self.REQUIRED_CONFIGS: if key not in self.config: self.bot.log_e(f"Missing '{key}' in {self.name} configuration.") missing = True return not missing def get_runtime_value(self, key, default=None, ns=None): """Get a value from the plugin runtime dict. This will get the value from the plugin namespace, but it is possible to get runtime values from other plugins using their name as `ns`. """ if ns is None: ns = self.name return self.bot.values[ns].get(key, default) def set_runtime_value(self, key, value): """Set a value in the plugin runtime dict.""" self.bot.values[self.name][key] = value def get_storage_value(self, key, default=None): """Get a value from the plugin persistent storage.""" return self.bot.storage.get(self.name, {}).get(key, default) def set_storage_value(self, key, value): """Set a value in the plugin persistent storage.""" if self.name not in self.bot.storage: self.bot.storage[self.name] = {key: value} else: self.bot.storage[self.name][key] = value def append_storage_list_value(self, key, value): """Append a value to a list in the plugin persistent storage.""" if self.name not in self.bot.storage: self.bot.storage[self.name] = {key: [value]} elif key not in self.bot.storage[self.name]: self.bot.storage[self.name][key] = [value] else: self.bot.storage[self.name][key].append(value) def remove_storage_list_value(self, key, value): """Remove a value from a persistent storage list.""" if self.name in self.bot.storage and key in self.bot.storage[self.name]: self.bot.storage[self.name][key].remove(value) def should_read_message(self, message): """Return a message content if it has been addressed to me, else None. If the message starts with one of the bot's names, the rest of the message is returned. It might be an empty str if the message was only someone saying a bot's name. In other cases, return None. Note that you do not need to use this method for command/question plugins, the next methods already check for this and do more precise parsing of the message. This is rather for plugins reacting to a message addressed to the bot that are neither commands or questions. """ first_word_and_rest = message.split(maxsplit=1) num_parts = len(first_word_and_rest) if num_parts == 0: return None # Are the config conditions to answer a question valid? elif not self.__respects_handling_conditions(): return False # Is the message addressed to me? elif first_word_and_rest[0] in self.bot.names: if num_parts == 1: return "" else: return first_word_and_rest[1].strip() def should_answer_question(self, message): """Store Question in object and return True if I should answer it. To answer a question, the message must start with one of the bot's names and optionally end with one or more question marks (they are discarded). The bot checks that answering conditions are respected, and they cannot be bypassed as with commands. A Question created is checked from the plugin's registered questions and stored in the instance. """ words = message.split() # Is the message addressed to me? if len(words) == 0 or words[0].lower() not in self.bot.names: return False # Are the config conditions to answer a question valid? if not self.__respects_handling_conditions(): return False # Is it a question I can answer? question = message[len(words[0]):].strip() for preamble in self.config.get("questions", []): aliases = self.config.get("aliases", {}).get(preamble, []) for q in (preamble, *aliases): if question.startswith(q): content = question[len(q):].strip() content = content.rstrip("?").rstrip() question = Question(preamble, content) self.question = question self.bot.log_d( f"Answering from plugin {self.name}: {question}" ) return True return False def should_handle_command( self, message, no_content=False, exclude_conditions=None, ): """Store Command in object and return True if I should handle it. If no_content is True, the command does not parse command contents and put all the command message (without suffix) to the command identifier. This is useful for commands that have multiple words in their identifier and do not have any content, or when the content parsing should be done by the plugin itself. If exclude_conditions is a collection of plugin namespaces, the conditions of these plugins are not tested. A basic scenario is the wakeup command from sleep plugin that requires excluding its own condition (i.e. do not handle commands when sleeping). """ # Are the config conditions to handle a command valid? if not self.__respects_handling_conditions(exclude_conditions): return False # Is it a valid command? parsed_command = self.__parse_command(message, no_content=no_content) if not parsed_command: return False # Is it a command I can handle? available_commands = self.config.get("commands", []) aliases = self.config.get("aliases", {}) for ident in available_commands: # Match commands differently according to no_content. If no_content # is True, check the parsed command (pc) raw data as a string that # may contain the available identifier (ai) at its beginning. # If no_content is False (default), simply compare the parsed # identifier with available identifiers. if no_content: match = lambda pc, ai: ( pc.raw == ai or pc.raw.startswith(ai + " ") ) else: match = lambda pc, ai: pc.ident == ai # First case: the command identifier has been used. if match(parsed_command, ident): parsed_command.ident = ident parsed_command.match = ident self.__save_command(parsed_command) return True # Second case: an alias of the identifier has been used. ident_aliases = aliases.get(ident, []) for alias in ident_aliases: if match(parsed_command, alias): parsed_command.ident = ident parsed_command.match = alias self.__save_command(parsed_command) return True return False def __parse_command(self, message, no_content=False): """Return a parsed Command if this message is a command, None otherwise. The command raw field is always set. The ident and content fields are empty when no_content is True. The match field is never set by this method. """ words = message.split() if len(words) == 0: return None command_suffix = self.config["command_suffix"] if words[0].lower() in self.bot.names and words[-1] == command_suffix: raw = " ".join(words[1:-1]) if no_content: ident = "" content = "" else: ident = words[1] content = " ".join(words[2:-1]) return Command(ident, content, raw) def __save_command(self, command): """Save command in instance for further processing by the plugin.""" self.command = command self.bot.log_d(f"Processing command from plugin {self.name}: {command}") def __respects_handling_conditions(self, exclude_conditions=None): """Check if question conditions are valid.""" conditions = self.config.get("handling_conditions", {}) for plugin_ns, plugin_conditions in conditions.items(): if exclude_conditions and plugin_ns in exclude_conditions: continue for condition_key, condition_value in plugin_conditions.items(): value = self.get_runtime_value(condition_key, ns=plugin_ns) if condition_value != value: self.bot.log_d( f"Handling condition {plugin_ns}.{condition_key} false." ) return False return True def signal_failure(self, target): """Signal a plugin failure to target.""" self.bot.say(target, self.bot.config["error_message"]) @dataclass class Question: preamble: str content: str @dataclass class Command: # Identifier as set in config. Set even when an alias has been used. ident: str # Content of the command when it has been parsed, empty str otherwise. content: str # Raw command content (minus name and suffix), always set. raw: str # Identifier matched, possibly an alias. Set only when matched. match: str = ""