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README preview

Archive Notice

Thank you to everyone for using this software! It is no longer maintained.

However, there are many good alternatives out there for creating Matrix bots. In Python:

matrix-nio - The library this template is based on.
mautrix-python - Another low-level(ish) python matrix library.
- maubot - A plugin-based bot framework that handles most of the boilerplate for you. You just write simple plugins.

for even more options, see https://matrix.org/ecosystem/sdks/. Happy hacking!

Nio Template

A template for creating bots with matrix-nio. The documentation for matrix-nio can be found here.

This repo contains a working Matrix echo bot that can be easily extended to your needs. Detailed documentation is included as well as a step-by-step guide on basic bot building.

Features include out-of-the-box support for:

Bot commands
SQLite3 and Postgres database backends
Configuration files
Multi-level logging
Docker
Participation in end-to-end encrypted rooms

Projects using nio-template

anoadragon453/matrix-reminder-bot - A matrix bot to remind you about things
gracchus163/hopeless - COREbot for the Hope2020 conference Matrix server
alturiak/nio-smith - A modular bot for @matrix-org that can be dynamically extended by plugins
anoadragon453/msc-chatbot - A matrix bot for matrix spec proposals
anoadragon453/matrix-episode-bot - A matrix bot to post episode links
TheForcer/vision-nio - A general purpose matrix chatbot
anoadragon453/drawing-challenge-bot - A matrix bot to post historical, weekly art challenges from reddit to a room
8go/matrix-eno-bot - A bot to be used as a) personal assistant or b) as an admin tool to maintain your Matrix installation or server
elokapina/bubo - Matrix bot to help with community management
elokapina/middleman - Matrix bot to act as a middleman, for example as a support bot
chc4/matrix-pinbot - Matrix bot for pinning messages to a dedicated channel

Want your project listed here? Edit this page!

Getting started

See SETUP.md for how to setup and run the template project.

Project structure

A reference of each file included in the template repository, its purpose and what it does.

The majority of the code is kept inside of the my_project_name folder, which is in itself a python package, the __init__.py file inside declaring it as such.

To run the bot, the my-project-name script in the root of the codebase is available. It will import the main function from the main.py file in the package and run it. To properly install this script into your python environment, run pip install -e . in the project's root directory.

setup.py contains package information (for publishing your code to PyPI) and setup.cfg just contains some configuration options for linting tools.

sample.config.yaml is a sample configuration file. People running your bot should be advised to copy this file to config.yaml, then edit it according to their needs. Be sure never to check the edited config.yaml into source control since it'll likely contain sensitive details such as passwords!

Below is a detailed description of each of the source code files contained within the my_project_name directory:

`main.py`

Initialises the config file, the bot store, and nio's AsyncClient (which is used to retrieve and send events to a matrix homeserver). It also registering some callbacks on the AsyncClient to tell it to call some functions when certain events are received (such as an invite to a room, or a new message in a room the bot is in).

It also starts the sync loop. Matrix clients "sync" with a homeserver, by asking constantly asking for new events. Each time they do, the client gets a sync token (stored in the next_batch field of the sync response). If the client provides this token the next time it syncs (using the since parameter on the AsyncClient.sync method), the homeserver will only return new event since those specified by the given token.

This token is saved and provided again automatically by using the client.sync_forever(...) method.

`config.py`

This file reads a config file at a given path (hardcoded as config.yaml in main.py), processes everything in it and makes the values available to the rest of the bot's code so it knows what to do. Most of the options in the given config file have default values, so things will continue to work even if an option is left out of the config file. Obviously there are some config values that are required though, like the homeserver URL, username, access token etc. Otherwise the bot can't function.

`storage.py`

Creates (if necessary) and connects to a SQLite3 database and provides commands to put or retrieve data from it. Table definitions should be specified in _initial_setup, and any necessary migrations should be put in _run_migrations. There's currently no defined method for how migrations should work though.

`callbacks.py`

Holds callback methods which get run when the bot get a certain type of event from the homserver during sync. The type and name of the method to be called are specified in main.py. Currently there are two defined methods, one that gets called when a message is sent in a room the bot is in, and another that runs when the bot receives an invite to the room.

The message callback function, message, checks if the message was for the bot, and whether it was a command. If both of those are true, the bot will process that command.

The invite callback function, invite, processes the invite event and attempts to join the room. This way, the bot will auto-join any room it is invited to.

`bot_commands.py`

Where all the bot's commands are defined. New commands should be defined in process with an associated private method. echo and help commands are provided by default.

A Command object is created when a message comes in that's recognised as a command from a user directed at the bot (either through the specified command prefix (defined by the bot's config file), or through a private message directly to the bot. The process command is then called for the bot to act on that command.

`message_responses.py`

Where responses to messages that are posted in a room (but not necessarily directed at the bot) are specified. callbacks.py will listen for messages in rooms the bot is in, and upon receiving one will create a new Message object (which contains the message text, amongst other things) and calls process() on it, which can send a message to the room as it sees fit.

A good example of this would be a Github bot that listens for people mentioning issue numbers in chat (e.g. "We should fix #123"), and the bot sending messages to the room immediately afterwards with the issue name and link.

`chat_functions.py`

A separate file to hold helper methods related to messaging. Mostly just for organisational purposes. Currently just holds send_text_to_room, a helper method for sending formatted messages to a room.

`errors.py`

Custom error types for the bot. Currently there's only one special type that's defined for when a error is found while the config file is being processed.

Questions?

Any questions? Please ask them in #nio-template:amorgan.xyz and we'll help you out!

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