mirror of
https://github.com/nonebot/nonebot2.git
synced 2024-11-24 17:15:05 +08:00
684 lines
24 KiB
Python
684 lines
24 KiB
Python
import asyncio
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import re
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import shlex
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from datetime import datetime
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from typing import (
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Tuple, Union, Callable, Iterable, Any, Optional, List, Dict,
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Awaitable
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)
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from nonebot import NoneBot, permission as perm
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from nonebot.command.argfilter import ValidateError
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from nonebot.helpers import context_id, send, render_expression
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from nonebot.log import logger
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from nonebot.message import Message
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from nonebot.session import BaseSession
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from nonebot.typing import (
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Context_T, CommandName_T, CommandArgs_T, Message_T, State_T,
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Filter_T
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)
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# key: one segment of command name
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# value: subtree or a leaf Command object
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_registry = {} # type: Dict[str, Union[Dict, Command]]
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# key: alias
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# value: real command name
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_aliases = {} # type: Dict[str, CommandName_T]
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# key: context id
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# value: CommandSession object
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_sessions = {} # type: Dict[str, CommandSession]
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CommandHandler_T = Callable[['CommandSession'], Any]
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class Command:
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__slots__ = ('name', 'func',
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'permission',
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'only_to_me',
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'privileged',
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'args_parser_func')
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def __init__(self, *,
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name: CommandName_T,
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func: CommandHandler_T,
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permission: int,
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only_to_me: bool,
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privileged: bool):
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self.name = name
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self.func = func
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self.permission = permission
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self.only_to_me = only_to_me
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self.privileged = privileged
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self.args_parser_func: Optional[CommandHandler_T] = None
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async def run(self, session, *,
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check_perm: bool = True,
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dry: bool = False) -> bool:
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"""
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Run the command in a given session.
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:param session: CommandSession object
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:param check_perm: should check permission before running
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:param dry: just check any prerequisite, without actually running
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:return: the command is finished (or can be run, given dry == True)
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"""
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has_perm = await self._check_perm(session) if check_perm else True
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if self.func and has_perm:
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if dry:
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return True
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if session.current_arg_filters is not None and \
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session.current_key is not None:
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# argument-level filters are given, use them
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arg = session.current_arg
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config = session.bot.config
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for f in session.current_arg_filters:
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try:
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res = f(arg)
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if isinstance(res, Awaitable):
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res = await res
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arg = res
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except ValidateError as e:
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# validation failed
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if config.MAX_VALIDATION_FAILURES > 0:
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# should check number of validation failures
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session.state['__validation_failure_num'] = \
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session.state.get(
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'__validation_failure_num', 0) + 1
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if session.state['__validation_failure_num'] >= \
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config.MAX_VALIDATION_FAILURES:
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# noinspection PyProtectedMember
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session.finish(render_expression(
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config.TOO_MANY_VALIDATION_FAILURES_EXPRESSION
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), **session._current_send_kwargs)
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failure_message = e.message
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if failure_message is None:
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failure_message = render_expression(
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config.DEFAULT_VALIDATION_FAILURE_EXPRESSION
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)
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# noinspection PyProtectedMember
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session.pause(failure_message,
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**session._current_send_kwargs)
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# passed all filters
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session.state[session.current_key] = arg
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else:
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# fallback to command-level args_parser_func
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if self.args_parser_func:
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await self.args_parser_func(session)
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if session.current_key is not None and \
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session.current_key not in session.state:
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# args_parser_func didn't set state, here we set it
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session.state[session.current_key] = session.current_arg
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await self.func(session)
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return True
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return False
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async def _check_perm(self, session) -> bool:
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"""
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Check if the session has sufficient permission to
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call the command.
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:param session: CommandSession object
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:return: the session has the permission
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"""
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return await perm.check_permission(session.bot, session.ctx,
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self.permission)
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class CommandFunc:
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__slots__ = ('cmd', 'func')
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def __init__(self, cmd: Command, func: CommandHandler_T):
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self.cmd = cmd
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self.func = func
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def __call__(self, session: 'CommandSession') -> Any:
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return self.func(session)
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def args_parser(self, parser_func: CommandHandler_T) -> CommandHandler_T:
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"""
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Decorator to register a function as the arguments parser of
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the corresponding command.
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"""
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self.cmd.args_parser_func = parser_func
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return parser_func
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def on_command(name: Union[str, CommandName_T], *,
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aliases: Iterable[str] = (),
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permission: int = perm.EVERYBODY,
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only_to_me: bool = True,
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privileged: bool = False,
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shell_like: bool = False) -> Callable:
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"""
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Decorator to register a function as a command.
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:param name: command name (e.g. 'echo' or ('random', 'number'))
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:param aliases: aliases of command name, for convenient access
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:param permission: permission required by the command
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:param only_to_me: only handle messages to me
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:param privileged: can be run even when there is already a session
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:param shell_like: use shell-like syntax to split arguments
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"""
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def deco(func: CommandHandler_T) -> CommandHandler_T:
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if not isinstance(name, (str, tuple)):
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raise TypeError('the name of a command must be a str or tuple')
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if not name:
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raise ValueError('the name of a command must not be empty')
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cmd_name = (name,) if isinstance(name, str) else name
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cmd = Command(name=cmd_name, func=func, permission=permission,
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only_to_me=only_to_me, privileged=privileged)
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if shell_like:
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async def shell_like_args_parser(session):
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session.args['argv'] = shlex.split(session.current_arg)
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cmd.args_parser_func = shell_like_args_parser
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current_parent = _registry
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for parent_key in cmd_name[:-1]:
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current_parent[parent_key] = current_parent.get(parent_key) or {}
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current_parent = current_parent[parent_key]
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current_parent[cmd_name[-1]] = cmd
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for alias in aliases:
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_aliases[alias] = cmd_name
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return CommandFunc(cmd, func)
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return deco
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def _find_command(name: Union[str, CommandName_T]) -> Optional[Command]:
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cmd_name = (name,) if isinstance(name, str) else name
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if not cmd_name:
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return None
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cmd_tree = _registry
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for part in cmd_name[:-1]:
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if part not in cmd_tree or not isinstance(cmd_tree[part], dict):
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return None
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cmd_tree = cmd_tree[part]
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cmd = cmd_tree.get(cmd_name[-1])
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return cmd if isinstance(cmd, Command) else None
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class _PauseException(Exception):
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"""
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Raised by session.pause() indicating that the command session
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should be paused to ask the user for some arguments.
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"""
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pass
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class _FinishException(Exception):
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"""
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Raised by session.finish() indicating that the command session
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should be stopped and removed.
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"""
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def __init__(self, result: bool = True):
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"""
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:param result: succeeded to call the command
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"""
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self.result = result
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class SwitchException(Exception):
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"""
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Raised by session.switch() indicating that the command session
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should be stopped and replaced with a new one (going through
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handle_message() again).
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Since the new context message will go through handle_message()
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again, the later function should be notified. So this exception
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is designed to be propagated to handle_message().
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"""
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def __init__(self, new_ctx_message: Message):
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"""
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:param new_ctx_message: new message which should be placed in context
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"""
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self.new_ctx_message = new_ctx_message
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class CommandSession(BaseSession):
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__slots__ = ('cmd',
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'current_key', 'current_arg_filters', '_current_send_kwargs',
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'current_arg', '_current_arg_text', '_current_arg_images',
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'_state', '_last_interaction', '_running')
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def __init__(self, bot: NoneBot, ctx: Context_T, cmd: Command, *,
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current_arg: str = '', args: Optional[CommandArgs_T] = None):
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super().__init__(bot, ctx)
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self.cmd = cmd # Command object
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# unique key of the argument that is currently requesting (asking)
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self.current_key: Optional[str] = None
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# initialize current argument filters
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self.current_arg_filters: Optional[List[Filter_T]] = None
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self._current_send_kwargs: Dict[str, Any] = {}
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# initialize current argument
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self.current_arg: str = '' # with potential CQ codes
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self._current_arg_text = None
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self._current_arg_images = None
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self.refresh(ctx, current_arg=current_arg) # fill the above
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self._state: State_T = {}
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if args:
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self._state.update(args)
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self._last_interaction = None # last interaction time of this session
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self._running = False
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@property
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def state(self) -> State_T:
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"""
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State of the session.
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This contains all named arguments and
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other session scope temporary values.
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"""
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return self._state
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@property
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def args(self) -> CommandArgs_T:
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"""Deprecated. Use `session.state` instead."""
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return self.state
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@property
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def running(self) -> bool:
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return self._running
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@running.setter
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def running(self, value) -> None:
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if self._running is True and value is False:
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# change status from running to not running, record the time
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self._last_interaction = datetime.now()
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self._running = value
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@property
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def is_valid(self) -> bool:
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"""Check if the session is expired or not."""
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if self.bot.config.SESSION_EXPIRE_TIMEOUT and \
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self._last_interaction and \
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datetime.now() - self._last_interaction > \
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self.bot.config.SESSION_EXPIRE_TIMEOUT:
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return False
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return True
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@property
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def is_first_run(self) -> bool:
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return self._last_interaction is None
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@property
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def current_arg_text(self) -> str:
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"""
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Plain text part in the current argument, without any CQ codes.
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"""
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if self._current_arg_text is None:
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self._current_arg_text = Message(
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self.current_arg).extract_plain_text()
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return self._current_arg_text
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@property
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def current_arg_images(self) -> List[str]:
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"""
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Images (as list of urls) in the current argument.
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"""
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if self._current_arg_images is None:
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self._current_arg_images = [
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s.data['url'] for s in Message(self.current_arg)
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if s.type == 'image' and 'url' in s.data
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]
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return self._current_arg_images
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@property
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def argv(self) -> List[str]:
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"""
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Shell-like argument list, similar to sys.argv.
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Only available while shell_like is True in on_command decorator.
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"""
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return self.state.get('argv', [])
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def refresh(self, ctx: Context_T, *, current_arg: str = '') -> None:
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"""
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Refill the session with a new message context.
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:param ctx: new message context
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:param current_arg: new command argument as a string
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"""
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self.ctx = ctx
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self.current_arg = current_arg
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self._current_arg_text = None
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self._current_arg_images = None
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def get(self, key: str, *,
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prompt: Optional[Message_T] = None,
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arg_filters: Optional[List[Filter_T]] = None,
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**kwargs) -> Any:
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"""
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Get an argument with a given key.
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If the argument does not exist in the current session,
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a pause exception will be raised, and the caller of
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the command will know it should keep the session for
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further interaction with the user.
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:param key: argument key
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:param prompt: prompt to ask the user
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:param arg_filters: argument filters for the next user input
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:return: the argument value
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"""
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if key in self.state:
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return self.state[key]
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self.current_key = key
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self.current_arg_filters = arg_filters
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self._current_send_kwargs = kwargs
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self.pause(prompt, **kwargs)
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def get_optional(self, key: str,
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default: Optional[Any] = None) -> Optional[Any]:
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"""
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Simply get a argument with given key.
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Deprecated. Use `session.state.get()` instead.
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"""
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return self.state.get(key, default)
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def pause(self, message: Optional[Message_T] = None, **kwargs) -> None:
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"""Pause the session for further interaction."""
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if message:
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asyncio.ensure_future(self.send(message, **kwargs))
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raise _PauseException
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def finish(self, message: Optional[Message_T] = None, **kwargs) -> None:
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"""Finish the session."""
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if message:
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asyncio.ensure_future(self.send(message, **kwargs))
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raise _FinishException
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def switch(self, new_ctx_message: Message_T) -> None:
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"""
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Finish the session and switch to a new (fake) message context.
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The user may send another command (or another intention as natural
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language) when interacting with the current session. In this case,
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the session may not understand what the user is saying, so it
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should call this method and pass in that message, then NoneBot will
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handle the situation properly.
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"""
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if self.is_first_run:
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# if calling this method during first run,
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# we think the command is not handled
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raise _FinishException(result=False)
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if not isinstance(new_ctx_message, Message):
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new_ctx_message = Message(new_ctx_message)
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raise SwitchException(new_ctx_message)
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def parse_command(bot: NoneBot,
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cmd_string: str) -> Tuple[Optional[Command], Optional[str]]:
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"""
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Parse a command string (typically from a message).
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:param bot: NoneBot instance
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:param cmd_string: command string
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:return: (Command object, current arg string)
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"""
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logger.debug(f'Parsing command: {cmd_string}')
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matched_start = None
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for start in bot.config.COMMAND_START:
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# loop through COMMAND_START to find the longest matched start
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curr_matched_start = None
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if isinstance(start, type(re.compile(''))):
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m = start.search(cmd_string)
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if m and m.start(0) == 0:
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curr_matched_start = m.group(0)
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elif isinstance(start, str):
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if cmd_string.startswith(start):
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curr_matched_start = start
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if curr_matched_start is not None and \
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(matched_start is None or
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len(curr_matched_start) > len(matched_start)):
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# a longer start, use it
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matched_start = curr_matched_start
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if matched_start is None:
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# it's not a command
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logger.debug('It\'s not a command')
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return None, None
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logger.debug(f'Matched command start: '
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f'{matched_start}{"(empty)" if not matched_start else ""}')
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full_command = cmd_string[len(matched_start):].lstrip()
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if not full_command:
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# command is empty
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return None, None
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cmd_name_text, *cmd_remained = full_command.split(maxsplit=1)
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cmd_name = _aliases.get(cmd_name_text)
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if not cmd_name:
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for sep in bot.config.COMMAND_SEP:
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# loop through COMMAND_SEP to find the most optimized split
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curr_cmd_name = None
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if isinstance(sep, type(re.compile(''))):
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curr_cmd_name = tuple(sep.split(cmd_name_text))
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elif isinstance(sep, str):
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curr_cmd_name = tuple(cmd_name_text.split(sep))
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if curr_cmd_name is not None and \
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(not cmd_name or len(curr_cmd_name) > len(cmd_name)):
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# a more optimized split, use it
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cmd_name = curr_cmd_name
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if not cmd_name:
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cmd_name = (cmd_name_text,)
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logger.debug(f'Split command name: {cmd_name}')
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cmd = _find_command(cmd_name)
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if not cmd:
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logger.debug(f'Command {cmd_name} not found')
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return None, None
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logger.debug(f'Command {cmd.name} found, function: {cmd.func}')
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return cmd, ''.join(cmd_remained)
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async def handle_command(bot: NoneBot, ctx: Context_T) -> bool:
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"""
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Handle a message as a command.
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This function is typically called by "handle_message".
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:param bot: NoneBot instance
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:param ctx: message context
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:return: the message is handled as a command
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"""
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cmd, current_arg = parse_command(bot, str(ctx['message']).lstrip())
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is_privileged_cmd = cmd and cmd.privileged
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if is_privileged_cmd and cmd.only_to_me and not ctx['to_me']:
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is_privileged_cmd = False
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disable_interaction = is_privileged_cmd
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if is_privileged_cmd:
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logger.debug(f'Command {cmd.name} is a privileged command')
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ctx_id = context_id(ctx)
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if not is_privileged_cmd:
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# wait for 1.5 seconds (at most) if the current session is running
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retry = 5
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while retry > 0 and \
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_sessions.get(ctx_id) and _sessions[ctx_id].running:
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retry -= 1
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await asyncio.sleep(0.3)
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check_perm = True
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session = _sessions.get(ctx_id) if not is_privileged_cmd else None
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if session:
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if session.running:
|
|
logger.warning(f'There is a session of command '
|
|
f'{session.cmd.name} running, notify the user')
|
|
asyncio.ensure_future(send(
|
|
bot, ctx,
|
|
render_expression(bot.config.SESSION_RUNNING_EXPRESSION)
|
|
))
|
|
# pretend we are successful, so that NLP won't handle it
|
|
return True
|
|
|
|
if session.is_valid:
|
|
logger.debug(f'Session of command {session.cmd.name} exists')
|
|
# since it's in a session, the user must be talking to me
|
|
ctx['to_me'] = True
|
|
session.refresh(ctx, current_arg=str(ctx['message']))
|
|
# there is no need to check permission for existing session
|
|
check_perm = False
|
|
else:
|
|
# the session is expired, remove it
|
|
logger.debug(f'Session of command {session.cmd.name} is expired')
|
|
if ctx_id in _sessions:
|
|
del _sessions[ctx_id]
|
|
session = None
|
|
|
|
if not session:
|
|
if not cmd:
|
|
logger.debug('Not a known command, ignored')
|
|
return False
|
|
if cmd.only_to_me and not ctx['to_me']:
|
|
logger.debug('Not to me, ignored')
|
|
return False
|
|
session = CommandSession(bot, ctx, cmd, current_arg=current_arg)
|
|
logger.debug(f'New session of command {session.cmd.name} created')
|
|
|
|
return await _real_run_command(session, ctx_id, check_perm=check_perm,
|
|
disable_interaction=disable_interaction)
|
|
|
|
|
|
async def call_command(bot: NoneBot, ctx: Context_T,
|
|
name: Union[str, CommandName_T], *,
|
|
current_arg: str = '',
|
|
args: Optional[CommandArgs_T] = None,
|
|
check_perm: bool = True,
|
|
disable_interaction: bool = False) -> bool:
|
|
"""
|
|
Call a command internally.
|
|
|
|
This function is typically called by some other commands
|
|
or "handle_natural_language" when handling NLPResult object.
|
|
|
|
Note: If disable_interaction is not True, after calling this function,
|
|
any previous command session will be overridden, even if the command
|
|
being called here does not need further interaction (a.k.a asking
|
|
the user for more info).
|
|
|
|
:param bot: NoneBot instance
|
|
:param ctx: message context
|
|
:param name: command name
|
|
:param current_arg: command current argument string
|
|
:param args: command args
|
|
:param check_perm: should check permission before running command
|
|
:param disable_interaction: disable the command's further interaction
|
|
:return: the command is successfully called
|
|
"""
|
|
cmd = _find_command(name)
|
|
if not cmd:
|
|
return False
|
|
session = CommandSession(bot, ctx, cmd, current_arg=current_arg, args=args)
|
|
return await _real_run_command(session, context_id(session.ctx),
|
|
check_perm=check_perm,
|
|
disable_interaction=disable_interaction)
|
|
|
|
|
|
async def _real_run_command(session: CommandSession,
|
|
ctx_id: str,
|
|
disable_interaction: bool = False,
|
|
**kwargs) -> bool:
|
|
if not disable_interaction:
|
|
# override session only when interaction is not disabled
|
|
_sessions[ctx_id] = session
|
|
try:
|
|
logger.debug(f'Running command {session.cmd.name}')
|
|
session.running = True
|
|
future = asyncio.ensure_future(session.cmd.run(session, **kwargs))
|
|
timeout = None
|
|
if session.bot.config.SESSION_RUN_TIMEOUT:
|
|
timeout = session.bot.config.SESSION_RUN_TIMEOUT.total_seconds()
|
|
|
|
try:
|
|
await asyncio.wait_for(future, timeout)
|
|
handled = future.result()
|
|
except asyncio.TimeoutError:
|
|
handled = True
|
|
except (_PauseException, _FinishException, SwitchException) as e:
|
|
raise e
|
|
except Exception as e:
|
|
logger.error(f'An exception occurred while '
|
|
f'running command {session.cmd.name}:')
|
|
logger.exception(e)
|
|
handled = True
|
|
raise _FinishException(handled)
|
|
except _PauseException:
|
|
session.running = False
|
|
if disable_interaction:
|
|
# if the command needs further interaction, we view it as failed
|
|
return False
|
|
logger.debug(f'Further interaction needed for '
|
|
f'command {session.cmd.name}')
|
|
# return True because this step of the session is successful
|
|
return True
|
|
except (_FinishException, SwitchException) as e:
|
|
session.running = False
|
|
logger.debug(f'Session of command {session.cmd.name} finished')
|
|
if not disable_interaction and ctx_id in _sessions:
|
|
# the command is finished, remove the session,
|
|
# but if interaction is disabled during this command call,
|
|
# we leave the _sessions untouched.
|
|
del _sessions[ctx_id]
|
|
|
|
if isinstance(e, _FinishException):
|
|
return e.result
|
|
elif isinstance(e, SwitchException):
|
|
# we are guaranteed that the session is not first run here,
|
|
# which means interaction is definitely enabled,
|
|
# so we can safely touch _sessions here.
|
|
if ctx_id in _sessions:
|
|
# make sure there is no session waiting
|
|
del _sessions[ctx_id]
|
|
logger.debug(f'Session of command {session.cmd.name} switching, '
|
|
f'new context message: {e.new_ctx_message}')
|
|
raise e # this is intended to be propagated to handle_message()
|
|
|
|
|
|
def kill_current_session(ctx: Context_T) -> None:
|
|
"""
|
|
Force kill current session of the given context,
|
|
despite whether it is running or not.
|
|
|
|
:param ctx: message context
|
|
"""
|
|
ctx_id = context_id(ctx)
|
|
if ctx_id in _sessions:
|
|
del _sessions[ctx_id]
|
|
|
|
|
|
from nonebot.command.group import CommandGroup
|