548 lines
16 KiB
Python
548 lines
16 KiB
Python
from __future__ import annotations
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import asyncio
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import re
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import sys
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import traceback
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from dataclasses import dataclass
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from time import sleep, time
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from typing import List, Any, AsyncGenerator, Coroutine, TypeVar
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from typing import Optional, Generator, Match, Callable, Union, Awaitable
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from slackclient import SlackClient
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from slackclient.client import SlackNotConnected
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# Enable to do single-threaded and have better exceptions
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import identifier
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import scroll_util
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DEBUG_MODE = False
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"""
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Objects to represent things within a slack workspace
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"""
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@dataclass
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class User:
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id: str
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name: str
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real_name: Optional[str]
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email: Optional[str]
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async def get_brother(self) -> Optional[scroll_util.Brother]:
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"""
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Try to find the brother corresponding to this user.
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"""
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return await identifier.lookup_slackid_brother(self.id)
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@dataclass
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class Channel:
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id: str
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name: str
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"""
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Objects to represent attributes an event may contain
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"""
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@dataclass
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class Event:
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channel: Optional[ChannelContext] = None
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user: Optional[UserContext] = None
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message: Optional[MessageContext] = None
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thread: Optional[ThreadContext] = None
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# If this was posted in a specific channel or conversation
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@dataclass
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class ChannelContext:
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channel_id: str
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def get_channel(self) -> Channel:
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raise NotImplementedError()
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# If there is a specific user associated with this event
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@dataclass
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class UserContext:
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user_id: str
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def as_user(self) -> User:
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raise NotImplementedError()
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# Whether or not this is a threadable text message
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@dataclass
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class MessageContext:
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ts: str
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text: str
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@dataclass
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class ThreadContext:
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thread_ts: str
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parent_ts: str
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# If a file was additionally shared
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@dataclass
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class File:
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pass
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"""
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Objects for interfacing easily with rtm steams
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"""
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def message_stream(slack: SlackClient) -> Generator[Event, None, None]:
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"""
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Generator that yields messages from slack.
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Messages are in standard api format, look it up.
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Checks on 2 second intervals (may be changed)
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"""
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# Do forever
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while True:
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try:
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if slack.rtm_connect(with_team_state=False, auto_reconnect=True):
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print("Waiting for messages")
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while True:
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sleep(0.1)
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update_list = slack.rtm_read()
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# Handle each
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for update in update_list:
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print("Message received: {}".format(update))
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event = Event()
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# Big logic folks
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if update["type"] == "message":
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event.message = MessageContext(update["ts"], update["text"])
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event.channel = ChannelContext(update["channel"])
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event.user = UserContext(update["user"])
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# TODO: Handle more types
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# We need to
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yield event
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except (SlackNotConnected, OSError) as e:
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print("Error while reading messages:")
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print(e)
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except (ValueError, TypeError) as e:
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print("Malformed message... Restarting connection")
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print(e)
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sleep(5)
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print("Connection failed - retrying")
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"""
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Objects to wrap slack connections
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"""
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# Read the API token
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api_file = open("apitoken.txt", 'r')
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SLACK_API = next(api_file).strip()
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api_file.close()
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class ClientWrapper(object):
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"""
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Essentially the main state object.
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We only ever expect one of these per api token.
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Holds a slack client, and handles messsages.
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"""
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def __init__(self, api_token):
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# Init slack
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self.slack = SlackClient(api_token)
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# Hooks go regex -> callback on (slack, msg, match)
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self.hooks: List[AbsHook] = []
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# Periodicals are just wrappers around an iterable, basically
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self.passives: List[Passive] = []
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# Cache users and channels
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self.users: dict = {}
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self.channels: dict = {}
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self.update_users()
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self.update_channels()
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# Scheduled events handling
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def add_passive(self, per: Passive) -> None:
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self.passives.append(per)
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async def run_passives(self) -> None:
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"""
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Run all currently added passives
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"""
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awaitables = [p.run() for p in self.passives]
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await asyncio.gather(*awaitables)
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# Message handling
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def add_hook(self, hook: AbsHook) -> None:
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self.hooks.append(hook)
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async def respond_messages(self) -> None:
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"""
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Asynchronous tasks that eternally reads and responds to messages.
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"""
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async for t in self.spool_tasks():
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sys.stdout.flush()
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if DEBUG_MODE:
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await t
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async def spool_tasks(self) -> AsyncGenerator[asyncio.Task, Any]:
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async for event in self.async_event_feed():
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# Find which hook, if any, satisfies
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for hook in list(self.hooks): # Note that we do list(self.hooks) to avoid edit-while-iterating issues
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# Try invoking each
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try:
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# Try to make a coroutine handling the message
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coro = hook.try_apply(event)
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# If we get a coro back, then task it up and set consumption appropriately
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if coro is not None:
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print("Spawned task")
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yield asyncio.create_task(_exception_printing_task(coro))
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if hook.consumes:
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break
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except DeadHook:
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# If a hook wants to die, let it.
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self.hooks.remove(hook)
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print("Done spawning tasks. Now {} running total.".format(len(asyncio.all_tasks())))
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async def async_event_feed(self) -> AsyncGenerator[Event, None]:
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"""
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Async wrapper around the message feed.
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Yields messages awaitably forever.
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"""
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# Create the msg feed
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feed = message_stream(self.slack)
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# Create a simple callable that gets one message from the feed
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def get_one():
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return next(feed)
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# Continuously yield async threaded tasks that poll the feed
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while True:
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yield await asyncio.get_running_loop().run_in_executor(None, get_one)
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def get_channel(self, channel_id: str) -> Optional[Channel]:
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return self.channels.get(channel_id)
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def get_channel_by_name(self, channel_name: str) -> Optional[Channel]:
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# Find the channel in the dict
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for v in self.channels.values():
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if v.name == channel_name:
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return v
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return None
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def get_user(self, user_id: str) -> Optional[Channel]:
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return self.users.get(user_id)
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def api_call(self, api_method, **kwargs):
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return self.slack.api_call(api_method, **kwargs)
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def reply(self, event: Event, text: str, in_thread: bool = True) -> dict:
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"""
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Replies to a message.
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Message must have a channel and message context.
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Returns the JSON response.
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"""
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# Ensure we're actually replying to a valid message
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assert (event.channel and event.message) is not None
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# Send in a thread by default
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if in_thread:
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# Figure otu what thread to send it to
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thread = event.message.ts
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if event.thread:
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thread = event.thread.thread_ts
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return self.send_message(text, event.channel.channel_id, thread=thread)
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else:
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return self.send_message(text, event.channel.channel_id)
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def send_message(self, text: str, channel_id: str, thread: str = None, broadcast: bool = False) -> dict:
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"""
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Copy of the internal send message function of slack, with some helpful options.
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Returns the JSON response.
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"""
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kwargs = {"channel": channel_id, "text": text}
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if thread:
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kwargs["thread_ts"] = thread
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if broadcast:
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kwargs["reply_broadcast"] = True
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return self.api_call("chat.postMessage", **kwargs)
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def update_channels(self):
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"""
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Queries the slack API for all current channels
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"""
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# Necessary because of pagination
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cursor = None
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# Make a new dict to use
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new_dict = {}
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# Iterate over results
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while True:
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# Set args depending on if a cursor exists
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args = {"limit": 1000, "type": "public_channel,private_channel,mpim,im"}
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if cursor:
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args["cursor"] = cursor
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channel_dicts = self.api_call("https://slack.com/api/conversations.list", **args)
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# If the response is good, put its results to the dict
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if channel_dicts["ok"]:
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for channel_dict in channel_dicts["channels"]:
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new_channel = Channel(id=channel_dict["id"],
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name=channel_dict["name"])
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new_dict[new_channel.id] = new_channel
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# If no new channels, just give it up
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if len(channel_dicts["channels"]) == 0:
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break
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# Otherwise, fetch the cursor
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cursor = channel_dicts.get("response_metadata").get("next_cursor")
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else:
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print("Warning: failed to retrieve channels")
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break
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self.channels = new_dict
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def update_users(self):
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"""
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Queries the slack API for all current users
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"""
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# Necessary because of pagination
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cursor = None
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while True:
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# Set args depending on if a cursor exists
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args = {"limit": 1000}
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if cursor:
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args["cursor"] = cursor
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user_dicts = self.api_call("https://slack.com/api/users.list", **args)
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# Make a new dict to use
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new_dict = {}
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# If the response is good:
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if user_dicts["ok"]:
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for user_dict in user_dicts["members"]:
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new_user = User(id=user_dict.get("id"),
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name=user_dict.get("name"),
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real_name=user_dict.get("real_name"),
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email=user_dict.get("profile").get("email"))
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new_dict[new_user.id] = new_user
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# If no new channels, just give it up
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if len(user_dicts["channels"]) == 0:
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break
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# Otherwise, fetch the cursor
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cursor = user_dicts.get("response_metadata").get("next_cursor")
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else:
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print("Warning: failed to retrieve channels")
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break
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self.users = new_dict
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# Create a single instance of the client wrapper
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_singleton = ClientWrapper(SLACK_API)
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def get_slack() -> ClientWrapper:
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return _singleton
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# Return type of an event callback
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MsgAction = Coroutine[Any, Any, None]
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# Type signature of an event callback function
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Callback = Callable[[Event, Match], MsgAction]
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"""
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Hooks
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"""
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# Signal exception to be raised when a hook has died
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class DeadHook(Exception):
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pass
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# Abstract hook parent class
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class AbsHook(object):
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def __init__(self, consumes_applicable: bool):
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# Whether or not messages that yield a coroutine should not be checked further
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self.consumes = consumes_applicable
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def try_apply(self, event: Event) -> Optional[MsgAction]:
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raise NotImplementedError()
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class ChannelHook(AbsHook):
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"""
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Hook that handles messages in a variety of channels
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"""
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def __init__(self,
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callback: Callback,
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patterns: Union[str, List[str]],
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channel_whitelist: Optional[List[str]] = None,
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channel_blacklist: Optional[List[str]] = None,
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consumer: bool = True):
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super(ChannelHook, self).__init__(consumer)
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# Save all
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if not isinstance(patterns, list):
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patterns = [patterns]
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self.patterns = patterns
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self.channel_whitelist = channel_whitelist
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self.channel_blacklist = channel_blacklist
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self.callback = callback
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# Remedy some sensible defaults
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if self.channel_blacklist is None:
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self.channel_blacklist = ["#general"]
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elif self.channel_whitelist is None:
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pass # We leave as none to show no whitelisting in effect
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else:
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raise ValueError("Cannot whitelist and blacklist")
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def try_apply(self, event: Event) -> Optional[MsgAction]:
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"""
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Returns whether a message should be handled by this dict, returning a Match if so, or None
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"""
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# Ensure that this is an event in a specific channel, with a text component
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if not (event.channel and event.message):
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return None
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# Fail if pattern invalid
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match = None
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for p in self.patterns:
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match = re.match(p, event.message.text.strip(), flags=re.IGNORECASE)
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if match is not None:
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break
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if match is None:
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return None
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# Get the channel name
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channel_name = event.channel.get_channel().name
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# Fail if whitelist defined, and we aren't there
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if self.channel_whitelist is not None and channel_name not in self.channel_whitelist:
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return None
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# Fail if blacklist defined, and we are there
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if self.channel_blacklist is not None and channel_name in self.channel_blacklist:
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return None
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return self.callback(event, match)
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class ReplyWaiter(AbsHook):
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"""
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A special hook that only cares about replies to a given message.
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"""
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def __init__(self, callback: Callback, pattern: str, thread_ts: str, lifetime: float):
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super().__init__(True)
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self.callback = callback
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self.pattern = pattern
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self.thread_ts = thread_ts
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self.lifetime = lifetime
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self.start_time = time()
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self.dead = False
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def try_apply(self, event: Event) -> Optional[MsgAction]:
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# First check: are we dead of age yet?
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time_alive = time() - self.start_time
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should_expire = time_alive > self.lifetime
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# If so, give up the ghost
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if self.dead or should_expire:
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raise DeadHook()
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# Next make sure we're actually a message
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if not (event.message and event.thread):
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return None
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# Otherwise proceed normally
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# Is the msg the one we care about? If not, ignore
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if event.thread.thread_ts != self.thread_ts:
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return None
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# Does it match the regex? if not, ignore
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match = re.match(self.pattern, event.message.text.strip(), flags=re.IGNORECASE)
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if match:
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self.dead = True
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return self.callback(event, match)
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else:
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return None
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class Passive(object):
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"""
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Base class for Periodical tasks, such as reminders and stuff
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"""
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async def run(self) -> None:
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# Run this passive routed through the specified slack client.
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raise NotImplementedError()
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"""
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Methods for easily responding to messages, etc.
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"""
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T = TypeVar("T")
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class VerboseWrapper(Callable):
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"""
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Generates exception-ready delegates.
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Warns of exceptions as they are passed through it, via responding to the given message.
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"""
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def __init__(self, event: Event):
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self.event = event
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async def __call__(self, awt: Awaitable[T]) -> T:
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try:
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return await awt
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except Exception as e:
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get_slack().reply(self.event, "Error: {}".format(str(e)), True)
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raise e
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"""
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Miscellania
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"""
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A, B, C = TypeVar("A"), TypeVar("B"), TypeVar("C")
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# Prints exceptions instead of silently dropping them in async tasks
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async def _exception_printing_task(c: Coroutine[A, B, C]) -> Coroutine[A, B, C]:
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# Print exceptions as they pass through
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try:
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return await c
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except Exception:
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traceback.print_exc()
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raise
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