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Backport v2 MessageBox

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Lonami Exo 2022-05-13 10:15:26 +02:00
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commit f4b2fe9540
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2
telethon/_updates/__init__.py Normal file
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from .entitycache import EntityCache
from .messagebox import MessageBox, GapError

54
telethon/_updates/entitycache.py Normal file
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from .session import EntityType, Entity
_sentinel = object()
class EntityCache:
def __init__(
self,
hash_map: dict = _sentinel,
self_id: int = None,
self_bot: bool = False
):
self.hash_map = {} if hash_map is _sentinel else hash_map
self.self_id = self_id
self.self_bot = self_bot
def set_self_user(self, id, bot):
self.self_id = id
self.self_bot = bot
def get(self, id):
try:
hash, ty = self.hash_map[id]
return Entity(ty, id, hash)
except KeyError:
return None
def extend(self, users, chats):
# See https://core.telegram.org/api/min for "issues" with "min constructors".
self.hash_map.update(
(u.id, (
u.access_hash,
EntityType.BOT if u.bot else EntityType.USER,
))
for u in users
if getattr(u, 'access_hash', None) and not u.min
)
self.hash_map.update(
(c.id, (
c.access_hash,
EntityType.MEGAGROUP if c.megagroup else (
EntityType.GIGAGROUP if getattr(c, 'gigagroup', None) else EntityType.CHANNEL
),
))
for c in chats
if getattr(c, 'access_hash', None) and not getattr(c, 'min', None)
)
def get_all_entities(self):
return [Entity(ty, id, hash) for id, (hash, ty) in self.hash_map.items()]
def put(self, entity):
self.hash_map[entity.id] = (entity.hash, entity.ty)

607
telethon/_updates/messagebox.py Normal file
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"""
This module deals with correct handling of updates, including gaps, and knowing when the code
should "get difference" (the set of updates that the client should know by now minus the set
of updates that it actually knows).
Each chat has its own [`Entry`] in the [`MessageBox`] (this `struct` is the "entry point").
At any given time, the message box may be either getting difference for them (entry is in
[`MessageBox::getting_diff_for`]) or not. If not getting difference, a possible gap may be
found for the updates (entry is in [`MessageBox::possible_gaps`]). Otherwise, the entry is
on its happy path.
Gaps are cleared when they are either resolved on their own (by waiting for a short time)
or because we got the difference for the corresponding entry.
While there are entries for which their difference must be fetched,
[`MessageBox::check_deadlines`] will always return [`Instant::now`], since "now" is the time
to get the difference.
"""
import asyncio
import datetime
import time
from .session import SessionState, ChannelState
from ..tl import types as tl, functions as fn
# Telegram sends `seq` equal to `0` when "it doesn't matter", so we use that value too.
NO_SEQ = 0
# See https://core.telegram.org/method/updates.getChannelDifference.
BOT_CHANNEL_DIFF_LIMIT = 100000
USER_CHANNEL_DIFF_LIMIT = 100
# > It may be useful to wait up to 0.5 seconds
POSSIBLE_GAP_TIMEOUT = 0.5
# After how long without updates the client will "timeout".
#
# When this timeout occurs, the client will attempt to fetch updates by itself, ignoring all the
# updates that arrive in the meantime. After all updates are fetched when this happens, the
# client will resume normal operation, and the timeout will reset.
#
# Documentation recommends 15 minutes without updates (https://core.telegram.org/api/updates).
NO_UPDATES_TIMEOUT = 15 * 60
# Entry "enum".
# Account-wide `pts` includes private conversations (one-to-one) and small group chats.
ENTRY_ACCOUNT = object()
# Account-wide `qts` includes only "secret" one-to-one chats.
ENTRY_SECRET = object()
# Integers will be Channel-specific `pts`, and includes "megagroup", "broadcast" and "supergroup" channels.
_sentinel = object()
def next_updates_deadline():
return asyncio.get_running_loop().time() + NO_UPDATES_TIMEOUT
class GapError(ValueError):
pass
# Represents the information needed to correctly handle a specific `tl::enums::Update`.
class PtsInfo:
__slots__ = ('pts', 'pts_count', 'entry')
def __init__(
self,
pts: int,
pts_count: int,
entry: object
):
self.pts = pts
self.pts_count = pts_count
self.entry = entry
@classmethod
def from_update(cls, update):
pts = getattr(update, 'pts', None)
if pts:
pts_count = getattr(update, 'pts_count', None) or 0
try:
entry = update.message.peer_id.channel_id
except AttributeError:
entry = getattr(update, 'channel_id', None) or ENTRY_ACCOUNT
return cls(pts=pts, pts_count=pts_count, entry=entry)
qts = getattr(update, 'qts', None)
if qts:
pts_count = 1 if isinstance(update, _tl.UpdateNewEncryptedMessage) else 0
return cls(pts=qts, pts_count=pts_count, entry=ENTRY_SECRET)
return None
# The state of a particular entry in the message box.
class State:
__slots__ = ('pts', 'deadline')
def __init__(
self,
# Current local persistent timestamp.
pts: int,
# Next instant when we would get the update difference if no updates arrived before then.
deadline: float
):
self.pts = pts
self.deadline = deadline
# > ### Recovering gaps
# > […] Manually obtaining updates is also required in the following situations:
# > • Loss of sync: a gap was found in `seq` / `pts` / `qts` (as described above).
# > It may be useful to wait up to 0.5 seconds in this situation and abort the sync in case a new update
# > arrives, that fills the gap.
#
# This is really easy to trigger by spamming messages in a channel (with as little as 3 members works), because
# the updates produced by the RPC request take a while to arrive (whereas the read update comes faster alone).
class PossibleGap:
__slots__ = ('deadline', 'updates')
def __init__(
self,
deadline: float,
# Pending updates (those with a larger PTS, producing the gap which may later be filled).
updates: list # of updates
):
self.deadline = deadline
self.updates = updates
# Represents a "message box" (event `pts` for a specific entry).
#
# See https://core.telegram.org/api/updates#message-related-event-sequences.
class MessageBox:
__slots__ = ('map', 'date', 'seq', 'next_deadline', 'possible_gaps', 'getting_diff_for', 'reset_deadlines_for')
def __init__(
self,
# Map each entry to their current state.
map: dict = _sentinel, # entry -> state
# Additional fields beyond PTS needed by `ENTRY_ACCOUNT`.
date: datetime.datetime = datetime.datetime(*time.gmtime(0)[:6]).replace(tzinfo=datetime.timezone.utc),
seq: int = NO_SEQ,
# Holds the entry with the closest deadline (optimization to avoid recalculating the minimum deadline).
next_deadline: object = None, # entry
# Which entries have a gap and may soon trigger a need to get difference.
#
# If a gap is found, stores the required information to resolve it (when should it timeout and what updates
# should be held in case the gap is resolved on its own).
#
# Not stored directly in `map` as an optimization (else we would need another way of knowing which entries have
# a gap in them).
possible_gaps: dict = _sentinel, # entry -> possiblegap
# For which entries are we currently getting difference.
getting_diff_for: set = _sentinel, # entry
# Temporarily stores which entries should have their update deadline reset.
# Stored in the message box in order to reuse the allocation.
reset_deadlines_for: set = _sentinel # entry
):
self.map = {} if map is _sentinel else map
self.date = date
self.seq = seq
self.next_deadline = next_deadline
self.possible_gaps = {} if possible_gaps is _sentinel else possible_gaps
self.getting_diff_for = set() if getting_diff_for is _sentinel else getting_diff_for
self.reset_deadlines_for = set() if reset_deadlines_for is _sentinel else reset_deadlines_for
# region Creation, querying, and setting base state.
def load(self, session_state, channel_states):
"""
Create a [`MessageBox`] from a previously known update state.
"""
deadline = next_updates_deadline()
self.map.clear()
if session_state.pts != NO_SEQ:
self.map[ENTRY_ACCOUNT] = State(pts=session_state.pts, deadline=deadline)
if session_state.qts != NO_SEQ:
self.map[ENTRY_SECRET] = State(pts=session_state.qts, deadline=deadline)
self.map.update((s.channel_id, State(pts=s.pts, deadline=deadline)) for s in channel_states)
self.date = datetime.datetime.fromtimestamp(session_state.date).replace(tzinfo=datetime.timezone.utc)
self.seq = session_state.seq
self.next_deadline = ENTRY_ACCOUNT
def session_state(self):
"""
Return the current state.
This should be used for persisting the state.
"""
return dict(
pts=self.map[ENTRY_ACCOUNT].pts if ENTRY_ACCOUNT in self.map else NO_SEQ,
qts=self.map[ENTRY_SECRET].pts if ENTRY_SECRET in self.map else NO_SEQ,
date=int(self.date.timestamp()),
seq=self.seq,
), {id: state.pts for id, state in self.map.items() if isinstance(id, int)}
def is_empty(self) -> bool:
"""
Return true if the message box is empty and has no state yet.
"""
return ENTRY_ACCOUNT not in self.map
def check_deadlines(self):
"""
Return the next deadline when receiving updates should timeout.
If a deadline expired, the corresponding entries will be marked as needing to get its difference.
While there are entries pending of getting their difference, this method returns the current instant.
"""
now = asyncio.get_running_loop().time()
if self.getting_diff_for:
return now
deadline = next_updates_deadline()
# Most of the time there will be zero or one gap in flight so finding the minimum is cheap.
if self.possible_gaps:
deadline = min(deadline, *(gap.deadline for gap in self.possible_gaps.values()))
elif self.next_deadline in self.map:
deadline = min(deadline, self.map[self.next_deadline].deadline)
if now > deadline:
# Check all expired entries and add them to the list that needs getting difference.
self.getting_diff_for.update(entry for entry, gap in self.possible_gaps.items() if now > gap.deadline)
self.getting_diff_for.update(entry for entry, state in self.map.items() if now > state.deadline)
# When extending `getting_diff_for`, it's important to have the moral equivalent of
# `begin_get_diff` (that is, clear possible gaps if we're now getting difference).
for entry in self.getting_diff_for:
self.possible_gaps.pop(entry, None)
return deadline
# Reset the deadline for the periods without updates for a given entry.
#
# It also updates the next deadline time to reflect the new closest deadline.
def reset_deadline(self, entry, deadline):
if entry in self.map:
self.map[entry].deadline = deadline
# TODO figure out why not in map may happen
if self.next_deadline == entry:
# If the updated deadline was the closest one, recalculate the new minimum.
self.next_deadline = min(self.map.items(), key=lambda entry_state: entry_state[1].deadline)[0]
elif self.next_deadline in self.map and deadline < self.map[self.next_deadline].deadline:
# If the updated deadline is smaller than the next deadline, change the next deadline to be the new one.
self.next_deadline = entry
# else an unrelated deadline was updated, so the closest one remains unchanged.
# Convenience to reset a channel's deadline, with optional timeout.
def reset_channel_deadline(self, channel_id, timeout):
self.reset_deadline(channel_id, asyncio.get_running_loop().time() + (timeout or NO_UPDATES_TIMEOUT))
# Reset all the deadlines in `reset_deadlines_for` and then empty the set.
def apply_deadlines_reset(self):
next_deadline = next_updates_deadline()
reset_deadlines_for = self.reset_deadlines_for
self.reset_deadlines_for = set() # "move" the set to avoid self.reset_deadline() from touching it during iter
for entry in reset_deadlines_for:
self.reset_deadline(entry, next_deadline)
reset_deadlines_for.clear() # reuse allocation, the other empty set was a temporary dummy value
self.reset_deadlines_for = reset_deadlines_for
# Sets the update state.
#
# Should be called right after login if [`MessageBox::new`] was used, otherwise undesirable
# updates will be fetched.
def set_state(self, state):
deadline = next_updates_deadline()
if state.pts != NO_SEQ:
self.map[ENTRY_ACCOUNT] = State(pts=state.pts, deadline=deadline)
else:
self.map.pop(ENTRY_ACCOUNT, None)
if state.qts != NO_SEQ:
self.map[ENTRY_SECRET] = State(pts=state.qts, deadline=deadline)
else:
self.map.pop(ENTRY_SECRET, None)
self.date = state.date
self.seq = state.seq
# Like [`MessageBox::set_state`], but for channels. Useful when getting dialogs.
#
# The update state will only be updated if no entry was known previously.
def try_set_channel_state(self, id, pts):
if id not in self.map:
self.map[id] = State(pts=pts, deadline=next_updates_deadline())
# Begin getting difference for the given entry.
#
# Clears any previous gaps.
def begin_get_diff(self, entry):
self.getting_diff_for.add(entry)
self.possible_gaps.pop(entry, None)
# Finish getting difference for the given entry.
#
# It also resets the deadline.
def end_get_diff(self, entry):
try:
self.getting_diff_for.remove(entry)
except KeyError:
pass
self.reset_deadline(entry, next_updates_deadline())
assert entry not in self.possible_gaps, "gaps shouldn't be created while getting difference"
# endregion Creation, querying, and setting base state.
# region "Normal" updates flow (processing and detection of gaps).
# Process an update and return what should be done with it.
#
# Updates corresponding to entries for which their difference is currently being fetched
# will be ignored. While according to the [updates' documentation]:
#
# > Implementations [have] to postpone updates received via the socket while
# > filling gaps in the event and `Update` sequences, as well as avoid filling
# > gaps in the same sequence.
#
# In practice, these updates should have also been retrieved through getting difference.
#
# [updates documentation] https://core.telegram.org/api/updates
def process_updates(
self,
updates,
chat_hashes,
result, # out list of updates; returns list of user, chat, or raise if gap
):
date = getattr(updates, 'date', None)
if date is None:
# updatesTooLong is the only one with no date (we treat it as a gap)
raise GapError
seq = getattr(updates, 'seq', None) or NO_SEQ
seq_start = getattr(updates, 'seq_start', None) or seq
users = getattr(updates, 'users', None) or []
chats = getattr(updates, 'chats', None) or []
updates = getattr(updates, 'updates', None) or [updates]
# > For all the other [not `updates` or `updatesCombined`] `Updates` type constructors
# > there is no need to check `seq` or change a local state.
if seq_start != NO_SEQ:
if self.seq + 1 > seq_start:
# Skipping updates that were already handled
return (users, chats)
elif self.seq + 1 < seq_start:
# Gap detected
self.begin_get_diff(ENTRY_ACCOUNT)
raise GapError
# else apply
self.date = date
if seq != NO_SEQ:
self.seq = seq
result.extend(filter(None, (self.apply_pts_info(u, reset_deadline=True) for u in updates)))
self.apply_deadlines_reset()
def _sort_gaps(update):
pts = PtsInfo.from_update(update)
return pts.pts - pts.pts_count if pts else 0
if self.possible_gaps:
# For each update in possible gaps, see if the gap has been resolved already.
for key in list(self.possible_gaps.keys()):
self.possible_gaps[key].updates.sort(key=_sort_gaps)
for _ in range(len(self.possible_gaps[key].updates)):
update = self.possible_gaps[key].updates.pop(0)
# If this fails to apply, it will get re-inserted at the end.
# All should fail, so the order will be preserved (it would've cycled once).
update = self.apply_pts_info(update, reset_deadline=False)
if update:
result.append(update)
# Clear now-empty gaps.
self.possible_gaps = {entry: gap for entry, gap in self.possible_gaps.items() if gap.updates}
return (users, chats)
# Tries to apply the input update if its `PtsInfo` follows the correct order.
#
# If the update can be applied, it is returned; otherwise, the update is stored in a
# possible gap (unless it was already handled or would be handled through getting
# difference) and `None` is returned.
def apply_pts_info(
self,
update,
*,
reset_deadline,
):
pts = PtsInfo.from_update(update)
if not pts:
# No pts means that the update can be applied in any order.
return update
# As soon as we receive an update of any form related to messages (has `PtsInfo`),
# the "no updates" period for that entry is reset.
#
# Build the `HashSet` to avoid calling `reset_deadline` more than once for the same entry.
if reset_deadline:
self.reset_deadlines_for.add(pts.entry)
if pts.entry in self.getting_diff_for:
# Note: early returning here also prevents gap from being inserted (which they should
# not be while getting difference).
return None
if pts.entry in self.map:
local_pts = self.map[pts.entry].pts
if local_pts + pts.pts_count > pts.pts:
# Ignore
return None
elif local_pts + pts.pts_count < pts.pts:
# Possible gap
# TODO store chats too?
if pts.entry not in self.possible_gaps:
self.possible_gaps[pts.entry] = PossibleGap(
deadline=asyncio.get_running_loop().time() + POSSIBLE_GAP_TIMEOUT,
updates=[]
)
self.possible_gaps[pts.entry].updates.append(update)
return None
else:
# Apply
pass
else:
# No previous `pts` known, and because this update has to be "right" (it's the first one) our
# `local_pts` must be one less.
local_pts = pts.pts - 1
# For example, when we're in a channel, we immediately receive:
# * ReadChannelInbox (pts = X)
# * NewChannelMessage (pts = X, pts_count = 1)
#
# Notice how both `pts` are the same. If we stored the one from the first, then the second one would
# be considered "already handled" and ignored, which is not desirable. Instead, advance local `pts`
# by `pts_count` (which is 0 for updates not directly related to messages, like reading inbox).
if pts.entry in self.map:
self.map[pts.entry].pts = local_pts + pts.pts_count
else:
self.map[pts.entry] = State(pts=local_pts + pts.pts_count, deadline=next_updates_deadline())
return update
# endregion "Normal" updates flow (processing and detection of gaps).
# region Getting and applying account difference.
# Return the request that needs to be made to get the difference, if any.
def get_difference(self):
entry = ENTRY_ACCOUNT
if entry in self.getting_diff_for:
if entry in self.map:
return _tl.fn.updates.GetDifference(
pts=self.map[ENTRY_ACCOUNT].pts,
pts_total_limit=None,
date=self.date,
qts=self.map[ENTRY_SECRET].pts if ENTRY_SECRET in self.map else NO_SEQ,
)
else:
# TODO investigate when/why/if this can happen
self.end_get_diff(entry)
return None
# Similar to [`MessageBox::process_updates`], but using the result from getting difference.
def apply_difference(
self,
diff,
chat_hashes,
):
if isinstance(diff, _tl.updates.DifferenceEmpty):
self.date = diff.date
self.seq = diff.seq
self.end_get_diff(ENTRY_ACCOUNT)
return [], [], []
elif isinstance(diff, _tl.updates.Difference):
self.end_get_diff(ENTRY_ACCOUNT)
chat_hashes.extend(diff.users, diff.chats)
return self.apply_difference_type(diff)
elif isinstance(diff, _tl.updates.DifferenceSlice):
chat_hashes.extend(diff.users, diff.chats)
return self.apply_difference_type(diff)
elif isinstance(diff, _tl.updates.DifferenceTooLong):
# TODO when are deadlines reset if we update the map??
self.map[ENTRY_ACCOUNT].pts = diff.pts
self.end_get_diff(ENTRY_ACCOUNT)
return [], [], []
def apply_difference_type(
self,
diff,
):
state = getattr(diff, 'intermediate_state', None) or diff.state
self.set_state(state)
for u in diff.other_updates:
if isinstance(u, _tl.UpdateChannelTooLong):
self.begin_get_diff(u.channel_id)
diff.other_updates.extend(_tl.UpdateNewMessage(
message=m,
pts=NO_SEQ,
pts_count=NO_SEQ,
) for m in diff.new_messages)
diff.other_updates.extend(_tl.UpdateNewEncryptedMessage(
message=m,
qts=NO_SEQ,
) for m in diff.new_encrypted_messages)
return diff.other_updates, diff.users, diff.chats
# endregion Getting and applying account difference.
# region Getting and applying channel difference.
# Return the request that needs to be made to get a channel's difference, if any.
def get_channel_difference(
self,
chat_hashes,
):
entry = next((id for id in self.getting_diff_for if isinstance(id, int)), None)
if not entry:
return None
packed = chat_hashes.get(entry)
if not packed:
# Cannot get channel difference as we're missing its hash
self.end_get_diff(entry)
# Remove the outdated `pts` entry from the map so that the next update can correct
# it. Otherwise, it will spam that the access hash is missing.
self.map.pop(entry, None)
return None
state = self.map.get(entry)
if not state:
# TODO investigate when/why/if this can happen
# Cannot get channel difference as we're missing its pts
self.end_get_diff(entry)
return None
return _tl.fn.updates.GetChannelDifference(
force=False,
channel=_tl.InputChannel(packed.id, packed.hash),
filter=_tl.ChannelMessagesFilterEmpty(),
pts=state.pts,
limit=BOT_CHANNEL_DIFF_LIMIT if chat_hashes.self_bot else USER_CHANNEL_DIFF_LIMIT
)
# Similar to [`MessageBox::process_updates`], but using the result from getting difference.
def apply_channel_difference(
self,
request,
diff,
chat_hashes,
):
entry = request.channel.channel_id
self.possible_gaps.pop(entry, None)
if isinstance(diff, _tl.updates.ChannelDifferenceEmpty):
assert diff.final
self.end_get_diff(entry)
self.map[entry].pts = diff.pts
return [], [], []
elif isinstance(diff, _tl.updates.ChannelDifferenceTooLong):
assert diff.final
self.map[entry].pts = diff.dialog.pts
chat_hashes.extend(diff.users, diff.chats)
self.reset_channel_deadline(entry, diff.timeout)
# This `diff` has the "latest messages and corresponding chats", but it would
# be strange to give the user only partial changes of these when they would
# expect all updates to be fetched. Instead, nothing is returned.
return [], [], []
elif isinstance(diff, _tl.updates.ChannelDifference):
if diff.final:
self.end_get_diff(entry)
self.map[entry].pts = diff.pts
diff.other_updates.extend(_tl.UpdateNewMessage(
message=m,
pts=NO_SEQ,
pts_count=NO_SEQ,
) for m in diff.new_messages)
chat_hashes.extend(diff.users, diff.chats)
self.reset_channel_deadline(entry, None)
return diff.other_updates, diff.users, diff.chats
# endregion Getting and applying channel difference.

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from typing import Optional, Tuple
from enum import IntEnum
class SessionState:
"""
Stores the information needed to fetch updates and about the current user.
* user_id: 64-bit number representing the user identifier.
* dc_id: 32-bit number relating to the datacenter identifier where the user is.
* bot: is the logged-in user a bot?
* pts: 64-bit number holding the state needed to fetch updates.
* qts: alternative 64-bit number holding the state needed to fetch updates.
* date: 64-bit number holding the date needed to fetch updates.
* seq: 64-bit-number holding the sequence number needed to fetch updates.
* takeout_id: 64-bit-number holding the identifier of the current takeout session.
Note that some of the numbers will only use 32 out of the 64 available bits.
However, for future-proofing reasons, we recommend you pretend they are 64-bit long.
"""
__slots__ = ('user_id', 'dc_id', 'bot', 'pts', 'qts', 'date', 'seq', 'takeout_id')
def __init__(
self,
user_id: int,
dc_id: int,
bot: bool,
pts: int,
qts: int,
date: int,
seq: int,
takeout_id: Optional[int]
):
self.user_id = user_id
self.dc_id = dc_id
self.bot = bot
self.pts = pts
self.qts = qts
self.date = date
self.seq = seq
self.takeout_id = takeout_id
class ChannelState:
"""
Stores the information needed to fetch updates from a channel.
* channel_id: 64-bit number representing the channel identifier.
* pts: 64-bit number holding the state needed to fetch updates.
"""
__slots__ = ('channel_id', 'pts')
def __init__(
self,
channel_id: int,
pts: int,
):
self.channel_id = channel_id
self.pts = pts
class EntityType(IntEnum):
"""
You can rely on the type value to be equal to the ASCII character one of:
* 'U' (85): this entity belongs to a :tl:`User` who is not a ``bot``.
* 'B' (66): this entity belongs to a :tl:`User` who is a ``bot``.
* 'G' (71): this entity belongs to a small group :tl:`Chat`.
* 'C' (67): this entity belongs to a standard broadcast :tl:`Channel`.
* 'M' (77): this entity belongs to a megagroup :tl:`Channel`.
* 'E' (69): this entity belongs to an "enormous" "gigagroup" :tl:`Channel`.
"""
USER = ord('U')
BOT = ord('B')
GROUP = ord('G')
CHANNEL = ord('C')
MEGAGROUP = ord('M')
GIGAGROUP = ord('E')
def canonical(self):
"""
Return the canonical version of this type.
"""
return _canon_entity_types[self]
_canon_entity_types = {
EntityType.USER: EntityType.USER,
EntityType.BOT: EntityType.USER,
EntityType.GROUP: EntityType.GROUP,
EntityType.CHANNEL: EntityType.CHANNEL,
EntityType.MEGAGROUP: EntityType.CHANNEL,
EntityType.GIGAGROUP: EntityType.CHANNEL,
}
class Entity:
"""
Stores the information needed to use a certain user, chat or channel with the API.
* ty: 8-bit number indicating the type of the entity (of type `EntityType`).
* id: 64-bit number uniquely identifying the entity among those of the same type.
* hash: 64-bit signed number needed to use this entity with the API.
The string representation of this class is considered to be stable, for as long as
Telegram doesn't need to add more fields to the entities. It can also be converted
to bytes with ``bytes(entity)``, for a more compact representation.
"""
__slots__ = ('ty', 'id', 'hash')
def __init__(
self,
ty: EntityType,
id: int,
hash: int
):
self.ty = ty
self.id = id
self.hash = hash
@property
def is_user(self):
"""
``True`` if the entity is either a user or a bot.
"""
return self.ty in (EntityType.USER, EntityType.BOT)
@property
def is_group(self):
"""
``True`` if the entity is a small group chat or `megagroup`_.
.. _megagroup: https://telegram.org/blog/supergroups5k
"""
return self.ty in (EntityType.GROUP, EntityType.MEGAGROUP)
@property
def is_broadcast(self):
"""
``True`` if the entity is a broadcast channel or `broadcast group`_.
.. _broadcast group: https://telegram.org/blog/autodelete-inv2#groups-with-unlimited-members
"""
return self.ty in (EntityType.CHANNEL, EntityType.GIGAGROUP)
@classmethod
def from_str(cls, string: str):
"""
Convert the string into an `Entity`.
"""
try:
ty, id, hash = string.split('.')
ty, id, hash = ord(ty), int(id), int(hash)
except AttributeError:
raise TypeError(f'expected str, got {string!r}') from None
except (TypeError, ValueError):
raise ValueError(f'malformed entity str (must be T.id.hash), got {string!r}') from None
return cls(EntityType(ty), id, hash)
@classmethod
def from_bytes(cls, blob):
"""
Convert the bytes into an `Entity`.
"""
try:
ty, id, hash = struct.unpack('<Bqq', blob)
except struct.error:
raise ValueError(f'malformed entity data, got {string!r}') from None
return cls(EntityType(ty), id, hash)
def __str__(self):
return f'{chr(self.ty)}.{self.id}.{self.hash}'
def __bytes__(self):
return struct.pack('<Bqq', self.ty, self.id, self.hash)