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359 lines
11 KiB
ReStructuredText
359 lines
11 KiB
ReStructuredText
Smart Plugins
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=============
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Pyrogram embeds a **smart**, lightweight yet powerful plugin system that is meant to further simplify the organization
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of large projects and to provide a way for creating pluggable (modular) components that can be **easily shared** across
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different Pyrogram applications with **minimal boilerplate code**.
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.. tip::
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Smart Plugins are completely optional and disabled by default.
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Introduction
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------------
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Prior to the Smart Plugin system, pluggable handlers were already possible. For example, if you wanted to modularize
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your applications, you had to put your function definitions in separate files and register them inside your main script,
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like this:
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.. note::
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This is an example application that replies in private chats with two messages: one containing the same
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text message you sent and the other containing the reversed text message.
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Example: *"Pyrogram"* replies with *"Pyrogram"* and *"margoryP"*
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.. code-block:: text
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myproject/
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config.ini
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handlers.py
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main.py
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- ``handlers.py``
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.. code-block:: python
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def echo(client, message):
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message.reply(message.text)
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def echo_reversed(client, message):
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message.reply(message.text[::-1])
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- ``main.py``
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.. code-block:: python
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from pyrogram import Client, MessageHandler, Filters
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from handlers import echo, echo_reversed
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app = Client("my_account")
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app.add_handler(
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MessageHandler(
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echo,
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Filters.text & Filters.private))
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app.add_handler(
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MessageHandler(
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echo_reversed,
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Filters.text & Filters.private),
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group=1)
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app.run()
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This is already nice and doesn't add *too much* boilerplate code, but things can get boring still; you have to
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manually ``import``, manually :meth:`add_handler <pyrogram.Client.add_handler>` and manually instantiate each
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:obj:`MessageHandler <pyrogram.MessageHandler>` object because **you can't use those cool decorators** for your
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functions. So, what if you could? Smart Plugins solve this issue by taking care of handlers registration automatically.
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Using Smart Plugins
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-------------------
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Setting up your Pyrogram project to accommodate Smart Plugins is straightforward:
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#. Create a new folder to store all the plugins (e.g.: "plugins", "handlers", ...).
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#. Put your python files full of plugins inside. Organize them as you wish.
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#. Enable plugins in your Client or via the *config.ini* file.
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.. note::
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This is the same example application `as shown above <#introduction>`_, written using the Smart Plugin system.
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.. code-block:: text
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:emphasize-lines: 2, 3
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myproject/
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plugins/
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handlers.py
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config.ini
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main.py
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- ``plugins/handlers.py``
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.. code-block:: python
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:emphasize-lines: 4, 9
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from pyrogram import Client, Filters
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@Client.on_message(Filters.text & Filters.private)
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def echo(client, message):
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message.reply(message.text)
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@Client.on_message(Filters.text & Filters.private, group=1)
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def echo_reversed(client, message):
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message.reply(message.text[::-1])
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- ``config.ini``
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.. code-block:: ini
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[plugins]
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root = plugins
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- ``main.py``
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.. code-block:: python
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from pyrogram import Client
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Client("my_account").run()
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Alternatively, without using the *config.ini* file:
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.. code-block:: python
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from pyrogram import Client
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plugins = dict(
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root="plugins"
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)
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Client("my_account", plugins=plugins).run()
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The first important thing to note is the new ``plugins`` folder. You can put *any python file* in *any subfolder* and
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each file can contain *any decorated function* (handlers) with one limitation: within a single module (file) you must
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use different names for each decorated function.
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The second thing is telling Pyrogram where to look for your plugins: you can either use the *config.ini* file or
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the Client parameter "plugins"; the *root* value must match the name of your plugins folder. Your Pyrogram Client
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instance will **automatically** scan the folder upon starting to search for valid handlers and register them for you.
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Then you'll notice you can now use decorators. That's right, you can apply the usual decorators to your callback
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functions in a static way, i.e. **without having the Client instance around**: simply use ``@Client`` (Client class)
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instead of the usual ``@app`` (Client instance) and things will work just the same.
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Specifying the Plugins to include
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---------------------------------
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By default, if you don't explicitly supply a list of plugins, every valid one found inside your plugins root folder will
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be included by following the alphabetical order of the directory structure (files and subfolders); the single handlers
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found inside each module will be, instead, loaded in the order they are defined, from top to bottom.
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.. note::
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Remember: there can be at most one handler, within a group, dealing with a specific update. Plugins with overlapping
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filters included a second time will not work. Learn more at `More on Updates <MoreOnUpdates.html>`_.
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This default loading behaviour is usually enough, but sometimes you want to have more control on what to include (or
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exclude) and in which exact order to load plugins. The way to do this is to make use of ``include`` and ``exclude``
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keys, either in the *config.ini* file or in the dictionary passed as Client argument. Here's how they work:
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- If both ``include`` and ``exclude`` are omitted, all plugins are loaded as described above.
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- If ``include`` is given, only the specified plugins will be loaded, in the order they are passed.
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- If ``exclude`` is given, the plugins specified here will be unloaded.
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The ``include`` and ``exclude`` value is a **list of strings**. Each string containing the path of the module relative
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to the plugins root folder, in Python notation (dots instead of slashes).
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E.g.: ``subfolder.module`` refers to ``plugins/subfolder/module.py``, with ``root="plugins"``.
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You can also choose the order in which the single handlers inside a module are loaded, thus overriding the default
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top-to-bottom loading policy. You can do this by appending the name of the functions to the module path, each one
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separated by a blank space.
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E.g.: ``subfolder.module fn2 fn1 fn3`` will load *fn2*, *fn1* and *fn3* from *subfolder.module*, in this order.
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Examples
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^^^^^^^^
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Given this plugins folder structure with three modules, each containing their own handlers (fn1, fn2, etc...), which are
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also organized in subfolders:
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.. code-block:: text
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myproject/
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plugins/
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subfolder1/
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plugins1.py
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- fn1
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- fn2
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- fn3
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subfolder2/
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plugins2.py
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...
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plugins0.py
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...
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...
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- Load every handler from every module, namely *plugins0.py*, *plugins1.py* and *plugins2.py* in alphabetical order
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(files) and definition order (handlers inside files):
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Using *config.ini* file:
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.. code-block:: ini
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[plugins]
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root = plugins
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Using *Client*'s parameter:
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.. code-block:: python
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plugins = dict(
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root="plugins"
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)
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Client("my_account", plugins=plugins).run()
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- Load only handlers defined inside *plugins2.py* and *plugins0.py*, in this order:
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Using *config.ini* file:
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.. code-block:: ini
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[plugins]
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root = plugins
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include =
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subfolder2.plugins2
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plugins0
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Using *Client*'s parameter:
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.. code-block:: python
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plugins = dict(
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root="plugins",
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include=[
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"subfolder2.plugins2",
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"plugins0"
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]
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)
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Client("my_account", plugins=plugins).run()
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- Load everything except the handlers inside *plugins2.py*:
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Using *config.ini* file:
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.. code-block:: ini
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[plugins]
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root = plugins
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exclude = subfolder2.plugins2
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Using *Client*'s parameter:
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.. code-block:: python
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plugins = dict(
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root="plugins",
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exclude=["subfolder2.plugins2"]
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)
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Client("my_account", plugins=plugins).run()
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- Load only *fn3*, *fn1* and *fn2* (in this order) from *plugins1.py*:
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Using *config.ini* file:
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.. code-block:: ini
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[plugins]
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root = plugins
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include = subfolder1.plugins1 fn3 fn1 fn2
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Using *Client*'s parameter:
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.. code-block:: python
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plugins = dict(
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root="plugins",
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include=["subfolder1.plugins1 fn3 fn1 fn2"]
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)
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Client("my_account", plugins=plugins).run()
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Load/Unload Plugins at Runtime
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------------------------------
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In the `previous section <#specifying-the-plugins-to-include>`_ we've explained how to specify which plugins to load and
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which to ignore before your Client starts. Here we'll show, instead, how to unload and load again a previously
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registered plugins at runtime.
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Each function decorated with the usual ``on_message`` decorator (or any other decorator that deals with Telegram updates
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) will be modified in such a way that, when you reference them later on, they will be actually pointing to a tuple of
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*(handler: Handler, group: int)*. The actual callback function is therefore stored inside the handler's *callback*
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attribute. Here's an example:
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- ``plugins/handlers.py``
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.. code-block:: python
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:emphasize-lines: 5, 6
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@Client.on_message(Filters.text & Filters.private)
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def echo(client, message):
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message.reply(message.text)
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print(echo)
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print(echo[0].callback)
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- Printing ``echo`` will show something like ``(<MessageHandler object at 0x10e3abc50>, 0)``.
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- Printing ``echo[0].callback``, that is, the *callback* attribute of the first eleent of the tuple, which is an
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Handler, will reveal the actual callback ``<function echo at 0x10e3b6598>``.
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Unloading
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^^^^^^^^^
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In order to unload a plugin, or any other handler, all you need to do is obtain a reference to it (by importing the
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relevant module) and call :meth:`remove_handler <pyrogram.Client.remove_handler>` Client's method with your function
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name preceded by the star ``*`` operator as argument. Example:
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- ``main.py``
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.. code-block:: python
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from plugins.handlers import echo
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...
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app.remove_handler(*echo)
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The star ``*`` operator is used to unpack the tuple into positional arguments so that *remove_handler* will receive
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exactly what is needed. The same could have been achieved with:
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.. code-block:: python
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handler, group = echo
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app.remove_handler(handler, group)
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Loading
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^^^^^^^
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Similarly to the unloading process, in order to load again a previously unloaded plugin you do the same, but this time
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using :meth:`add_handler <pyrogram.Client.add_handler>` instead. Example:
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- ``main.py``
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.. code-block:: python
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from plugins.handlers import echo
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...
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app.add_handler(*echo) |