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Add Heroku instructions to sessions documentation (#586)
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@ -44,3 +44,52 @@ methods. For example, you could save it on a database:
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You should read the ````session.py```` source file to know what "relevant
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data" you need to keep track of.
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Sessions and Heroku
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-------------------
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You probably have a newer version of SQLite installed (>= 3.8.2). Heroku uses
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SQLite 3.7.9 which does not support ``WITHOUT ROWID``. So, if you generated
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your session file on a system with SQLite >= 3.8.2 your session file will not
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work on Heroku's platform and will throw a corrupted schema error.
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There are multiple ways to solve this, the easiest of which is generating a
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session file on your Heroku dyno itself. The most complicated is creating
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a custom buildpack to install SQLite >= 3.8.2.
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Generating Session File on a Heroku Dyno
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. warning::
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Do not restart your application Dyno at any point prior to retrieving your
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session file. Constantly creating new session files from Telegram's API
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will result in a 24 hour rate limit ban.
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Due to Heroku's ephemeral filesystem all dynamically generated
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files not part of your applications buildpack or codebase are destroyed upon
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each restart.
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Using this scaffolded code we can start the authentication process:
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.. code-block:: python
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client = TelegramClient('login.session', api_id, api_hash).start()
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At this point your Dyno will crash because you cannot access stdin. Open your
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Dyno's control panel on the Heroku website and "run console" from the "More"
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dropdown at the top right. Enter ``bash`` and wait for it to load.
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You will automatically be placed into your applications working directory.
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So run your application ``python app.py`` and now you can complete the input
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requests such as "what is your phone number" etc.
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Once you're successfully authenticated exit your application script with
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CTRL + C and ``ls`` to confirm ``login.session`` exists in your current
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directory. Now you can create a git repo on your account and commit
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``login.session`` to that repo.
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You cannot ``ssh`` into your Dyno instance because it has crashed, so unless
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you programatically upload this file to a server host this is the only way to
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get it off of your Dyno.
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