PySpigot

PySpigot is a Spigot/Bukkit plugin that can load, compile, and run Python scripts. These scripts can make use of Java standard libraries, as well as the Bukkit/Spigot API and APIs of any other loaded plugins.

PySpigot utilizes Jython, a Java implementation of Python that runs entirely on the JVM.

A Note About Jython

The major drawback of Jython is that it currently only supports Python 2. Work towards a Python 3 implementation is currently ongoing over at Jython's GitHub repository.

Regarding different avenues, other Python-Java interop projects support Python 3. One such example is Py4J, which is more akin to a "network bridge" between the Python and Java runtimes rather than a true Python implementation. Although it supports Python 3, Py4J would be incredibly difficult to implement as a scripting engine for Bukkit, as it relies heavily on time-consuming I/O operations and Callbacks, which would make the Minecraft server quite unstable. Additionally, Py4J would require a CPython installation (regular Python) on the same machine, a rather difficult requirement to fulfill when working within a containerized Minecraft instance (such as Pterodactyl, shared hosting providers, etc.).

When I began this project, I looked at using several libraries, Py4J included. I came to the conclusion that, although Jython only supports Python 2, it has several key advantages over other libraries in this specific use case, including:

It runs entirely on the JVM, making it very easy to interface with Python code from the Java side.
It runs entirely on the JVM, which gives all Python code direct access to the entire Java classpath at runtime. Ergo, Python code has full access to Java code and vice versa.
It does not require any external Python installation to work. Drag and drop PySpigot into your plugins folder, and you're good to go.
And finally, it is reasonably fast (fast enough for Minecraft's standards), given that, again, it runs entirely on the JVM.

Thus, for the foreseeable future, PySpigot will continue to utilize Jython.

Features

PySpigot has many features, including:

Load scripts on server start and via commands
Stop, reload, and unload server scripts via commands
Register event listeners
Register commands
Schedule tasks (synchronous and asynchronous)
Work with config files
Register ProtocolLib packet listeners
Register PlaceholderAPI placeholder expansions
Comprehensive logging of errors and exceptions on a per-script basis, to file
Load Java libraries you'd like to work with at runtime
Write scripts in Python syntax
Scripts have complete access to the Bukkit/Spigot API, as well as APIs of other plugins, so anything is possible.
And more!

Using PySpigot

You can download the latest version of PySpigot from the releases page, or from Spigot. Drop it into your plugins folder, and you're ready to begin writing scripts.

PySpigot also has an official Discord server for support, updates, and announcements. Click here to join.

For complete documentation on writing/loading/running scripts, using PySpigot's provided managers, and using the plugin in general, see PySpigot's documentation.

For Java developers, PySpigot has an API! See the Javadocs for complete documentation of API available for you to use.

Adding PySpigot as a Dependency

Maven

Add the following repository:

<repository>
    <id>magicmq-repo</id>
    <url>https://repo.magicmq.dev/repository/maven-releases/</url>
</repository>

Then, add the following dependency:

<dependency>
    <groupId>dev.magicmq</groupId>
    <artifactId>pyspigot</artifactId>
    <version>{VERSION}</version>
    <scope>provided</scope>
</dependency>

Replace {VERSION} with the version shown above, without the v.

Gradle

Add the following repository:

repositories {
    ...
    magicmq-repo { url 'https://repo.magicmq.dev/repository/maven-releases/' }
}

Then, add the following dependency:

dependencies {
    ...
    compileOnly 'dev.magicmq:pyspigot:{VERSION}'
}

Replace {VERSION} with the version shown above, without the v.

Manual Usage

Releases are also published on GitHub here. You may download the JAR and import it yourself into your IDE of choice, or you may install it into your local repository.

Building

Building requires Maven and Git. Maven 3+ is recommended for building the project. Follow these steps:

Clone the repository: git clone https://github.com/magicmq/PySpigot.git
Enter the repository root: cd PySpigot
Build with Maven: mvn clean package
Built files will be located in the target directory.

Issues/Suggestions

Do you have any issues or suggestions? Submit an issue report.

magicmq/pyspigot