Edm0nd/edmond/plugin.py

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from dataclasses import dataclass
from pathlib import Path
class Plugin:
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"""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.
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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.
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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
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- -6: handling of unknown commands
- -7: handling of unknown questions
- -8: handling any message that might match something
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- -10: lowest, e.g. for random reactions usually with a very low rate
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"""
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REQUIRED_CONFIGS = []
def __init__(self, bot):
self.bot = bot
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self.name = self.__class__.__name__.lower()[:-6] # Remove "Plugin".
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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):
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"""Return the plugin section from the bot config, plus common values."""
plugins_configs = self.bot.config["plugins"]
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config = plugins_configs["common"].copy()
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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}.")
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return config
def __check_config(self):
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"""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.")
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missing = True
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return not missing
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def get_runtime_value(self, key, default=None, ns=None):
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"""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`.
"""
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if ns is None:
ns = self.name
return self.bot.values[ns].get(key, default)
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def set_runtime_value(self, key, value):
"""Set a value in the plugin runtime dict."""
self.bot.values[self.name][key] = value
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def get_storage_value(self, key, default=None, ns=None):
"""Get a value from the plugin persistent storage.
This will get the value from the plugin namespace, but it is possible to
get storage values from other plugins using their name as `ns`.
"""
if ns is None:
ns = self.name
return self.bot.storage.get(ns, {}).get(key, default)
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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):
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"""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)
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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
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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.
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"""
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():
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return None
# Is the message addressed to me?
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elif first_word_and_rest[0] in self.bot.names:
if num_parts == 1:
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content = ""
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else:
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content = first_word_and_rest[1].strip()
self.bot.log_i(f"Reading message from {self.name}: {content}")
return content
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def should_answer_question(self, message):
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"""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.
"""
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words = message.split()
# Is the message addressed to me?
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if len(words) == 0 or words[0].lower() not in self.bot.names:
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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()
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for preamble in self.config.get("questions", []):
aliases = self.config.get("aliases", {}).get(preamble, [])
for q in (preamble, *aliases):
if question.startswith(q):
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self.__save_question(question, q, preamble)
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return True
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return False
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def __save_question(self, question, match, preamble):
content = question[len(match):].strip()
content = content.rstrip("?").rstrip()
question = Question(preamble, content)
self.question = question
self.bot.log_i(f"Answering from plugin {self.name}: {question}")
def should_handle_command(
self,
message,
no_content=False,
exclude_conditions=None,
):
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"""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?
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parsed_command = self.__parse_command(message, no_content=no_content)
if not parsed_command:
return False
# Is it a command I can handle?
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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
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def __parse_command(self, message, no_content=False):
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"""Return a parsed Command if this message is a command, None otherwise.
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The command raw field is always set. The ident and content fields are
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empty when no_content is True. The match field is never set by this
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method.
"""
words = message.split()
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if len(words) == 0:
return None
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command_suffix = self.config["command_suffix"]
if words[0].lower() in self.bot.names and words[-1] == command_suffix:
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raw = " ".join(words[1:-1])
if no_content:
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ident = ""
content = ""
else:
ident = words[1]
content = " ".join(words[2:-1])
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return Command(ident, content, raw)
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def __save_command(self, command):
"""Save command in instance for further processing by the plugin."""
self.command = command
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self.bot.log_i(f"Processing command from plugin {self.name}: {command}")
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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:
return False
return True
def signal_failure(self, target):
"""Signal a plugin failure to target."""
self.bot.say(target, self.bot.config["error_message"])
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@dataclass
class Question:
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preamble: str
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content: str
@dataclass
class Command:
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# Identifier as set in config. Set even when an alias has been used.
ident: str
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# Content of the command when it has been parsed, empty str otherwise.
content: str
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# Raw command content (minus name and suffix), always set.
raw: str
# Identifier matched, possibly an alias. Set only when matched.
match: str = ""