mirror of
https://github.com/nonebot/nonebot2.git
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412 lines
14 KiB
Python
412 lines
14 KiB
Python
import asyncio
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import re
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from datetime import datetime
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from typing import (
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Tuple, Union, Callable, Iterable, Dict, Any, Optional, Sequence
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)
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from aiocqhttp.message import Message
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from . import NoneBot, permission as perm
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from .expression import render
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from .helpers import context_id
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from .session import BaseSession
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# Key: str (one segment of command name)
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# Value: subtree or a leaf Command object
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_registry = {}
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# Key: str
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# Value: tuple that identifies a command
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_aliases = {}
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# Key: context id
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# Value: CommandSession object
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_sessions = {}
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class Command:
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__slots__ = (
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'name', 'func', 'permission', 'only_to_me', 'args_parser_func')
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def __init__(self, *, name: Tuple[str], func: Callable, permission: int,
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only_to_me: 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.args_parser_func = 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 self.args_parser_func:
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await self.args_parser_func(session)
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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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def on_command(name: Union[str, Tuple[str]], *,
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aliases: Iterable = (),
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permission: int = perm.EVERYBODY,
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only_to_me: bool = True) -> 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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"""
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def deco(func: Callable) -> Callable:
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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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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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cmd = Command(name=cmd_name, func=func, permission=permission,
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only_to_me=only_to_me)
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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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def args_parser_deco(parser_func: Callable):
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cmd.args_parser_func = parser_func
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return parser_func
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func.args_parser = args_parser_deco
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return func
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return deco
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class CommandGroup:
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"""
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Group a set of commands with same name prefix.
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"""
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__slots__ = ('basename', 'permission', 'only_to_me')
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def __init__(self, name: Union[str, Tuple[str]],
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permission: Optional[int] = None, *,
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only_to_me: Optional[bool] = None):
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self.basename = (name,) if isinstance(name, str) else name
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self.permission = permission
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self.only_to_me = only_to_me
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def command(self, name: Union[str, Tuple[str]], *,
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aliases: Optional[Iterable] = None,
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permission: Optional[int] = None,
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only_to_me: Optional[bool] = None) -> Callable:
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sub_name = (name,) if isinstance(name, str) else name
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name = self.basename + sub_name
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kwargs = {}
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if aliases is not None:
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kwargs['aliases'] = aliases
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if permission is not None:
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kwargs['permission'] = permission
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elif self.permission is not None:
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kwargs['permission'] = self.permission
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if only_to_me is not None:
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kwargs['only_to_me'] = only_to_me
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elif self.only_to_me is not None:
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kwargs['only_to_me'] = self.only_to_me
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return on_command(name, **kwargs)
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def _find_command(name: Union[str, Tuple[str]]) -> 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:
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return None
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cmd_tree = cmd_tree[part]
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return cmd_tree.get(cmd_name[-1])
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class _FurtherInteractionNeeded(Exception):
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"""
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Raised by session.pause() indicating that the command should
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enter interactive mode 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 stop and removed.
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"""
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pass
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class CommandSession(BaseSession):
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__slots__ = ('cmd', 'current_key', 'current_arg', 'current_arg_text',
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'current_arg_images', 'args', 'last_interaction')
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def __init__(self, bot: NoneBot, ctx: Dict[str, Any], cmd: Command, *,
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current_arg: str = '', args: Optional[Dict[str, Any]] = None):
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super().__init__(bot, ctx)
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self.cmd = cmd # Command object
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self.current_key = None # current key that the command handler needs
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self.current_arg = None # current argument (with potential CQ codes)
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self.current_arg_text = None # current argument without any CQ codes
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self.current_arg_images = None # image urls in current argument
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self.refresh(ctx, current_arg=current_arg)
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self.args = args or {}
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self.last_interaction = None # last interaction time of this session
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def refresh(self, ctx: Dict[str, Any], *, 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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current_arg_as_msg = Message(current_arg)
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self.current_arg_text = current_arg_as_msg.extract_plain_text()
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self.current_arg_images = [s.data['url'] for s in current_arg_as_msg
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if s.type == 'image' and 'url' in s.data]
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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.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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def get(self, key: str, *, prompt: str = None,
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prompt_expr: Union[str, Sequence[str], Callable] = None) -> 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 FurtherInteractionNeeded exception will be raised,
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and the caller of the command will know it should keep
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the session for 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 prompt_expr: prompt expression to ask the user
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:return: the argument value
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:raise FurtherInteractionNeeded: further interaction is needed
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"""
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value = self.get_optional(key)
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if value is not None:
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return value
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self.current_key = key
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# ask the user for more information
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if prompt_expr is not None:
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prompt = render(prompt_expr, key=key)
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self.pause(prompt)
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def get_optional(self, key: str,
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default: Optional[Any] = None) -> Optional[Any]:
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"""Simply get a argument with given key."""
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return self.args.get(key, default)
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def pause(self, message=None) -> 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))
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raise _FurtherInteractionNeeded
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def finish(self, message=None) -> None:
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"""Finish the session."""
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if message:
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asyncio.ensure_future(self.send(message))
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raise _FinishException
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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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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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return None, None
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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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cmd = _find_command(cmd_name)
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if not cmd:
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return None, None
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return cmd, ''.join(cmd_remained)
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async def handle_command(bot: NoneBot, ctx: Dict[str, Any]) -> 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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ctx_id = context_id(ctx)
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session = None
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check_perm = True
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if _sessions.get(ctx_id):
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session = _sessions[ctx_id]
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if session and session.is_valid:
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session.refresh(ctx, current_arg=str(ctx['message']))
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# there is no need to check permission for existing session
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check_perm = False
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else:
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# the session is expired, remove it
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del _sessions[ctx_id]
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session = None
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if not session:
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cmd, current_arg = parse_command(bot, str(ctx['message']).lstrip())
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if not cmd or cmd.only_to_me and not ctx['to_me']:
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return False
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session = CommandSession(bot, ctx, cmd, current_arg=current_arg)
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return await _real_run_command(session, ctx_id, check_perm=check_perm)
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async def call_command(bot: NoneBot, ctx: Dict[str, Any],
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name: Union[str, Tuple[str]], *,
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current_arg: str = '',
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args: Optional[Dict[str, Any]] = None,
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check_perm: bool = True,
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disable_interaction: bool = False) -> bool:
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"""
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Call a command internally.
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This function is typically called by some other commands
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or "handle_natural_language" when handling NLPResult object.
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Note: If disable_interaction is not True, after calling this function,
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any previous command session will be overridden, even if the command
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being called here does not need further interaction (a.k.a asking
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the user for more info).
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:param bot: NoneBot instance
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:param ctx: message context
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:param name: command name
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:param current_arg: command current argument string
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:param args: command args
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:param check_perm: should check permission before running command
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:param disable_interaction: disable the command's further interaction
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:return: the command is successfully called
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"""
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cmd = _find_command(name)
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if not cmd:
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return False
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session = CommandSession(bot, ctx, cmd, current_arg=current_arg, args=args)
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return await _real_run_command(session, context_id(session.ctx),
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check_perm=check_perm,
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disable_interaction=disable_interaction)
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async def _real_run_command(session: CommandSession,
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ctx_id: str,
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disable_interaction: bool = False,
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**kwargs) -> bool:
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if not disable_interaction:
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# override session only when not disabling interaction
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_sessions[ctx_id] = session
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try:
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res = await session.cmd.run(session, **kwargs)
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if not disable_interaction:
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# the command is finished, remove the session
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del _sessions[ctx_id]
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return res
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except _FurtherInteractionNeeded:
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if disable_interaction:
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# if the command needs further interaction, we view it as failed
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return False
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session.last_interaction = datetime.now()
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# return True because this step of the session is successful
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return True
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except _FinishException:
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return True
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