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# Pyrogram - Telegram MTProto API Client Library for Python

# This file is part of Pyrogram.

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

from datetime import datetime

from typing import Union, Optional, AsyncGenerator

import pyrogram

from pyrogram import types, raw, utils

async def get_chunk(

client: "pyrogram.Client",

chat_id: Union[int, str],

limit: int = 0,

offset: int = 0,

from_message_id: int = 0,

from_date: datetime = utils.zero_datetime()

messages = await client.invoke(

raw.functions.messages.GetHistory(

peer=await client.resolve_peer(chat_id),

offset_id=from_message_id,

offset_date=utils.datetime_to_timestamp(from_date),

add_offset=offset,

limit=limit,

max_id=0,

min_id=0,

hash=0

sleep_threshold=60

)

return await utils.parse_messages(client, messages, replies=0)

class GetChatHistory:

async def get_chat_history(

self: "pyrogram.Client",

chat_id: Union[int, str],

limit: int = 0,

offset: int = 0,

offset_id: int = 0,

offset_date: datetime = utils.zero_datetime()

) -> Optional[AsyncGenerator["types.Message", None]]:

"""Get messages from a chat history.

The messages are returned in reverse chronological order.

.. include:: /_includes/usable-by/users.rst

Parameters:

chat_id (``int`` | ``str``):

Unique identifier (int) or username (str) of the target chat.

For your personal cloud (Saved Messages) you can simply use "me" or "self".

For a contact that exists in your Telegram address book you can use his phone number (str).

limit (``int``, *optional*):

Limits the number of messages to be retrieved.

By default, no limit is applied and all messages are returned.

offset (``int``, *optional*):

Sequential number of the first message to be returned..

Negative values are also accepted and become useful in case you set offset_id or offset_date.

offset_id (``int``, *optional*):

Identifier of the first message to be returned.

offset_date (:py:obj:`~datetime.datetime`, *optional*):

Pass a date as offset to retrieve only older messages starting from that date.

Returns:

``Generator``: A generator yielding :obj:`~pyrogram.types.Message` objects.

Example:

.. code-block:: python

async for message in app.get_chat_history(chat_id):

print(message.text)

"""

current = 0

total = limit or (1 << 31) - 1

limit = min(100, total)

while True:

messages = await get_chunk(

client=self,

chat_id=chat_id,

limit=limit,

offset=offset,

from_message_id=offset_id,

from_date=offset_date

)

if not messages:

return

offset_id = messages[-1].id

for message in messages:

yield message

current += 1

if current >= total:

return

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