zhangyuheng/DeerFolia
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases 17 Wiki Activity
master
DeerFolia/CONTRIBUTING.md

372 lines
17 KiB
Markdown
Raw Permalink Blame History

Contributing to Paper
==========================
PaperMC is happy you're willing to contribute to our projects. We are usually
very lenient with all submitted PRs, but there are still some guidelines you
can follow to make the approval process go more smoothly.
## Use a Personal Fork and not an Organization
Paper will routinely modify your PR, whether it's a quick rebase or to take care
of any minor nitpicks we might have. Often, it's better for us to solve these
problems for you than make you go back and forth trying to fix them yourself.
Unfortunately, if you use an organization for your PR, it prevents Paper from
modifying it. This requires us to manually merge your PR, resulting in us
closing the PR instead of marking it as merged.
We much prefer to have PRs show as merged, so please do not use repositories
on organizations for PRs.
See <https://github.com/isaacs/github/issues/1681> for more information on the
issue.
## Requirements
To get started with PRing changes, you'll need the following software, most of
which can be obtained in (most) package managers such as `apt` (Debian / Ubuntu;
you will most likely use this for WSL), `homebrew` (macOS / Linux), and more:
- `git` (package `git` everywhere);
- A Java 17 or later JDK (packages vary, use Google/DuckDuckGo/etc.).
- [Adoptium](https://adoptium.net/) has builds for most operating systems.
- Paper requires JDK 17 to build, however, makes use of Gradle's
[Toolchains](https://docs.gradle.org/current/userguide/toolchains.html)
feature to allow building with only JRE 11 or later installed. (Gradle will
automatically provision JDK 17 for compilation if it cannot find an existing
install).
If you're on Windows, check
[the section on WSL](#patching-and-building-is-really-slow-what-can-i-do).
If you're compiling with Docker, you can use Adoptium's
[`eclipse-temurin`](https://hub.docker.com/_/eclipse-temurin/) images like so:
```console
# docker run -it -v "$(pwd)":/data --rm eclipse-temurin:17.0.1_12-jdk bash
Pulling image...
root@abcdefg1234:/# javac -version
javac 17.0.1
```
## Rebasing PRs
Steps to rebase a PR to include the latest changes from `master`.
These steps assume the `origin` remote is your fork of this repository and `upstream` is the official PaperMC repository.
1. Pull the latest changes from upstreams master: `git checkout master && git pull upstream master`.
1. Checkout feature/fix branch and rebase on master: `git checkout patch-branch && git rebase master`.
1. Apply updated patches: `./gradlew applyPatches`.
1. If there are conflicts, fix them.
1. If your PR creates new patches instead of modifying existing ones, in both the `Paper-Server` and `Paper-API` directories, ensure your newly-created patch is the last commit by either:
* Renaming the patch file with a large 4-digit number in front (e.g. 9999-Patch-to-add-some-new-stuff.patch), and re-applying patches.
* Running `git rebase --interactive base` and moving the commits to the end.
1. Rebuild patches: `./gradlew rebuildPatches`.
1. Commit modified patches.
1. Force push changes: `git push --force`.
## PR Policy
We'll accept changes that make sense. You should be able to justify their
existence, along with any maintenance costs that come with them. Using
[obfuscation helpers](#obfuscation-helpers) aids in the maintenance costs.
Remember that these changes will affect everyone who runs Paper, not just you
and your server.
While we will fix minor formatting issues, you should stick to the guide below
when making and submitting changes.
## Formatting
All modifications to non-Paper files should be marked. The one exception to this is
when modifying javadoc comments, which should not have these markers.
- You need to add a comment with a short and identifiable description of the patch:
`// Paper start - <COMMIT DESCRIPTION>`
- The comments should generally be about the reason the change was made, what
it was before, or what the change is.
- After the general commit description, you can add additional information either
after a `;` or in the next line.
- Multi-line changes start with `// Paper start - <COMMIT DESCRIPTION>` and end
with `// Paper end - <COMMIT DESCRIPTION>`.
- One-line changes should have `// Paper - <COMMIT DESCRIPTION>` at the end of the line.
Here's an example of how to mark changes by Paper:
```java
entity.getWorld().dontBeStupid(); // Paper - Was beStupid(), which is bad
entity.getFriends().forEach(Entity::explode);
entity.updateFriends();
// Paper start - Use plugin-set spawn
// entity.getWorld().explode(entity.getWorld().getSpawn());
Location spawnLocation = ((CraftWorld)entity.getWorld()).getSpawnLocation();
entity.getWorld().explode(new BlockPosition(spawnLocation.getX(), spawnLocation.getY(), spawnLocation.getZ()));
// Paper end - Use plugin-set spawn
```
We generally follow the usual Java style (aka. Oracle style), or what is programmed
into most IDEs and formatters by default. There are a few notes, however:
- It is fine to go over 80 lines as long as it doesn't hurt readability.
There are exceptions, especially in Spigot-related files
- When in doubt or the code around your change is in a clearly different style,
use the same style as the surrounding code.
### Imports
When adding new imports to a class in a file not created by the current patch, use the fully qualified class name
instead of adding a new import to the top of the file. If you are using a type a significant number of times, you
can add an import with a comment. However, if its only used a couple of times, the FQN is preferred to prevent future
patch conflicts in the import section of the file.
```java
import org.bukkit.event.Event;
// don't add import here, use FQN like below
public class SomeEvent extends Event {
public final org.bukkit.Location newLocation; // Paper - add location
}
```
## Access Transformers
Sometimes, vanilla or CraftBukkit code already contains a field, method, or type you want to access
but the visibility is too low (e.g. a private field in an entity class). Paper can use access transformers
to change the visibility or remove the final modifier from fields, methods, and classes. Inside the `build-data/paper.at`
file, you can add ATs that are applied when you `./gradlew applyPatches`. You can read about the format of ATs
[here](https://mcforge.readthedocs.io/en/latest/advanced/accesstransformers/#access-modifiers).
### Important
ATs should be included in the patch file which requires them within the commit message. Do not commit any changes to the
`build-data/paper.at` file, just use it to initially change the visibility of members until you have finalized what you
need. Then, in the commit message for the patch which requires the ATs, add a header at the bottom of the commit message
before any co-authors. It should look like the following after you `./gradlew rebuildPatches`.
```
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 8 Jun 2022 22:20:16 -0700
Subject: [PATCH] Paper config files
This patch adds Paper configuration files.
Access transformers for this patch are below, but before the co-authors.
== AT ==
public org.spigotmc.SpigotWorldConfig getBoolean(Ljava/lang/String;Z)Z
public net.minecraft.world.level.NaturalSpawner SPAWNING_CATEGORIES
Co-authored-by: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
diff --git a/build.gradle.kts b/build.gradle.kts
...
```
## Patch Notes
When submitting patches to Paper, we may ask you to add notes to the patch
header. While we do not require it for all changes, you should add patch notes
when the changes you're making are technical, complex, or require an explanation
of some kind. It is very likely that your patch will remain long after we've all
forgotten about the details of your PR; patch notes will help us maintain it
without having to dig back through GitHub history looking for your PR.
These notes should express the intent of your patch, as well as any pertinent
technical details we should keep in mind long-term. Ultimately, they exist to
make it easier for us to maintain the patch across major version changes.
If you add a message to your commit in the `Paper-Server`/`Paper-API`
directories, the rebuild patches script will handle these patch notes
automatically as part of generating the patch file. If you are not
extremely careful, you should always just `squash` or `amend` a patch (see the
above sections on modifying patches) and rebuild.
Editing messages and patches by hand is possible, but you should patch and
rebuild afterwards to make sure you did it correctly. This is slower than just
modifying the patches properly after a few times, so you will not really gain
anything but headaches from doing it by hand.
Underneath is an example patch header/note:
```patch
From 02abc033533f70ef3165a97bfda3f5c2fa58633a Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Sun, 15 Oct 2017 00:29:07 +0100
Subject: [PATCH] revert serverside behavior of keepalives
This patch intends to bump up the time that a client has to reply to the
server back to 30 seconds as per pre 1.12.2, which allowed clients
more than enough time to reply potentially allowing them to be less
tempermental due to lag spikes on the network thread, e.g. that caused
by plugins that are interacting with netty.
We also add a system property to allow people to tweak how long the server
will wait for a reply. There is a compromise here between lower and higher
values, lower values will mean that dead connections can be closed sooner,
whereas higher values will make this less sensitive to issues such as spikes
from networking or during connections flood of chunk packets on slower clients,
at the cost of dead connections being kept open for longer.
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index a92bf8967..d0ab87d0f 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
```
## Obfuscation Helpers
While rarely needed, obfuscation helpers are sometimes useful when it comes
to unmapped local variables, or poorly named method parameters. In an effort
to make future updates easier on ourselves, Paper tries to use obfuscation
helpers wherever it makes sense. The purpose of these helpers is to make the
code more readable and maintainable. These helpers should be made easy to
inline by the JVM wherever possible.
An example of an obfuscation helper for a local variable:
```java
double d0 = entity.getX(); final double fromX = d0; // Paper - OBFHELPER
// ...
this.someMethod(fromX); // Paper
```
While they may not always be done in exactly the same way, the general goal is
always to improve readability and maintainability. Use your best judgment and do
what fits best in your situation.
## Configuration files
To use a configurable value in your patch, add a new field in either the
`GlobalConfiguration` or `WorldConfiguration` classes (inside the
`io.papermc.paper.configuration` package). Use `GlobalConfiguration` if a value
must remain the same throughout all worlds, or the latter if it can change
between worlds. World-specific configuration options are preferred whenever
possible.
### Example
This is adding a new miscellaneous setting that doesn't seem to fit in other categories.
Try to check and see if an existing category (inner class) exists that matches
whatever configuration option you are adding.
```java
public class GlobalConfiguration {
// other sections
public class Misc extends ConfigurationPart {
// other settings
public boolean lagCompensateBlockBreaking = true;
public boolean useDimensionTypeForCustomSpawners = false;
public int maxNumOfPlayers = 20; // This is the new setting
}
}
```
You set the type of the setting as the field type, and the default value is the
initial field value. The name of the setting defaults to the snake-case of the
field name, so in this case it would be `misc.max-num-of-players`. You can use
the `@Setting` annotation to override that, but generally just try to set the
field name to what you want the setting to be called.
#### Accessing the value
If you added a new global config value, you can access it in the code just by
doing
```java
int maxPlayers = GlobalConfiguration.get().misc.maxNumOfPlayers;
```
Generally for global config values you will use the fully qualified class name,
`io.papermc.paper.configuration.GlobalConfiguration` since it's not imported in
most places.
---
If you are adding a new world config value, you must have access to an instance
of the `net.minecraft.world.level.Level` which you can then access the config by doing
```java
int maxPlayers = level.paperConfig().misc.maxNumOfPlayers;
```
#### Committing changes
All changes to the `GlobalConfiguration` and `WorldConfiguration` files
should be done in the commit that created them. So do an interactive rebase
or fixup to apply just those changes to that commit, then add a new commit
that includes the logic that uses that option in the server somewhere.
## Testing API changes
### Using the Paper Test Plugin
The Paper project has a `test-plugin` module for easily testing out API changes
and additions. To use the test plugin, enable it in `test-plugin.settings.gradle.kts`,
which will be generated after running Gradle at least once. After this, you can edit
the test plugin, and run a server with the plugin using `./gradlew runDev` (or any
of the other Paper run tasks).
### Publishing to Maven local (use in external plugins)
To build and install the Paper APIs and Server to your local Maven repository, do the following:
- Run `./gradlew publishToMavenLocal` in the base directory.
If you use Gradle to build your plugin:
- Add `mavenLocal()` as a repository. Gradle checks repositories in the order they are declared,
so if you also have the Paper repository added, put the local repository above Paper's.
- Make sure to remove `mavenLocal()` when you are done testing, see the [Gradle docs](https://docs.gradle.org/current/userguide/declaring_repositories.html#sec:case-for-maven-local)
for more details.
If you use Maven to build your plugin:
- If you later need to use the Paper-API, you might want to remove the jar
from your local Maven repository.
If you use Windows and don't usually build using WSL, you might not need to
do this.
## Frequently Asked Questions
### I can't find the NMS file I need!
By default, Paper (and upstream) only import files we make changes to. If you
would like to make changes to a file that isn't present in `Paper-Server`'s
source directory, you just need to add it to our import script ran during the
patching process.
1. Save (rebuild) any patches you are in the middle of working on! Their
progress will be lost if you do not;
1. Identify the name(s) of the file(s) you want to import.
- A complete list of all possible file names can be found at
`./Paper-Server/.gradle/caches/paperweight/mc-dev-sources/net/minecraft/`. You might find
[MappingViewer] useful if you need to translate between Mojang and Spigot mapped names.
1. Open the file at `./build-data/dev-imports.txt` and add the name of your file to
the script. Follow the instructions there;
1. Re-patch the server `./gradlew applyPatches`;
1. Edit away!
> ❗ This change is temporary! **DO NOT COMMIT CHANGES TO THIS FILE!**
> Once you have made your changes to the new file, and rebuilt patches, you may
> undo your changes to `dev-imports.txt`.
Any file modified in a patch file gets automatically imported, so you only need
this temporarily to import it to create the first patch.
To undo your changes to the file, type `git checkout build-data/dev-imports.txt`.
### My commit doesn't need a build, what do I do?
Well, quite simple: You add `[ci skip]` to the start of your commit subject.
This case most often applies to changes to files like `README.md`, this very
file (`CONTRIBUTING.md`), the `LICENSE.md` file, and so forth.
### Patching and building is *really* slow, what can I do?
This only applies if you're running Windows. If you're running a prior Windows
release, either update to Windows 10/11 or move to macOS/Linux/BSD.
In order to speed up patching process on Windows, it's recommended you get WSL
2. This is available in Windows 10 v2004, build 19041 or higher. (You can check
your version by running `winver` in the run window (Windows key + R)). If you're
using an out of date version of Windows 10, update your system with the
[Windows 10 Update Assistant](https://www.microsoft.com/en-us/software-download/windows10) or [Windows 11 Update Assistant](https://www.microsoft.com/en-us/software-download/windows11).
To set up WSL 2, follow the information here:
<https://docs.microsoft.com/en-us/windows/wsl/install>
You will most likely want to use the Ubuntu apps. Once it's set up, install the
required tools with `sudo apt-get update && sudo apt-get install $TOOL_NAMES
-y`. Replace `$TOOL_NAMES` with the packages found in the
[requirements](#requirements). You can now clone the repository and do
everything like usual.
> ❗ Do not use the `/mnt/` directory in WSL! Instead, mount the WSL directories
> in Windows like described here:
> <https://docs.microsoft.com/en-us/windows/wsl/filesystems#view-your-current-directory-in-windows-file-explorer>
[MappingViewer]: https://mappings.cephx.dev/
Reference in New Issue View Git Blame Copy Permalink