getTelegramChannelMessages.py

offset_id = 0
limit = 100
all_messages = []
total_messages = 0
total_count_limit = 0

while True:
    print("Current Offset ID is:", offset_id, "; Total Messages:", total_messages)
    history = client(GetHistoryRequest(
        peer=my_channel,
        offset_id=offset_id,
        offset_date=None,
        add_offset=0,
        limit=limit,
        max_id=0,
        min_id=0,
        hash=0
    ))
    if not history.messages:
        break
    messages = history.messages
    for message in messages:
        all_messages.append(message.to_dict())
    offset_id = messages[len(messages) - 1].id
    total_messages = len(all_messages)
    if total_count_limit != 0 and total_messages >= total_count_limit:
        break