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56 lines
2.6 KiB
ReStructuredText
56 lines
2.6 KiB
ReStructuredText
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Sessions
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========
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.. currentmodule:: telethon
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In Telethon, the word :term:`session` is used to refer to the set of data needed to connect to Telegram.
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This includes the server address of your home datacenter, as well as the authorization key bound to an account.
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When you first connect to Telegram, an authorization key is generated to encrypt all communication.
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After login, Telegram remembers this authorization key as logged-in, so you don't need to login again.
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.. important::
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**Do not leak the session file!**
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Anyone with that file can login to the account stored in it.
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If you believe someone else has obtained this file, immediately revoke all active sessions from an official client.
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Some auxiliary information such as the user ID of the logged-in user is also kept.
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The update state, which can change every time an update is received from Telegram, is also stored in the session.
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Telethon needs this information to catch up on all missed updates while your code was not running.
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This is why it's important to call :meth:`Client.disconnect`.
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Doing so flushes all the update state to the session and saves it.
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Session files
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-------------
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Telethon defaults to using SQLite to store the session state.
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The session state is written to ``.session`` files, so make sure your VCS ignores them!
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To make sure the ``.session`` file is saved, you should call :meth:`Client.disconnect` before exiting the program.
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The first parameter in the :class:`Client` constructor is the session to use.
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You can use a `str`, a :class:`pathlib.Path` or a :class:`session.Storage`.
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The string or path are relative to the Current Working Directory.
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You can use absolute paths or relative paths to folders elsewhere.
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The ``.session`` extension is automatically added if the path has no extension.
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Session storages
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----------------
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The :class:`session.Storage` abstract base class defines the required methods to create custom storages.
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Telethon comes with two built-in storages:
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* :class:`~session.SqliteSession`. This is used by default when a string or path is used.
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* :class:`~session.MemorySession`. This is used by default when the path is ``None``.
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You can also use it directly when you have a :class:`~session.Session` instance.
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It's useful when you don't have file-system access.
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If you would like to store the session state in a different way, you can subclass :class:`session.Storage`.
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Some Python installations do not have the ``sqlite3`` module.
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In this case, attempting to use the default :class:`~session.SqliteSession` will fail.
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If this happens, you can try reinstalling Python.
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If you still don't have the ``sqlite3`` module, you should use a different storage.
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