Plugin support

Velocity (RPE Proxy)

On a network, every server behind the proxy normally sends its own pack. A player switching from the lobby to survival can get a second loading screen, and hosting the pack yourself means opening a port on every server.

RPE Proxy is a small plugin for your Velocity proxy that takes over sending the pack:

A player is sent the pack once, when they join the network. Switching servers sends nothing, unless the new server uses a different pack.
The proxy serves the pack itself, from one port on the proxy. Your servers hand it the pack over the player's connection, so nothing else has to be opened and the pack never leaves your machines.

It needs Velocity 3.4 or newer.

Installing#

1
Install RPE Proxy on the proxy
Download RPE-Proxy.jar, put it in your Velocity plugins folder and restart the proxy. It writes plugins/rpe-proxy/config.yml.
2
Open its port
Players download the pack from the proxy on port 8183. Open it (on a hosting panel, allocate it to the proxy) and set serve.public-address to your server's public address with that port, for example http://play.example.com:8183.
3
Turn it on in RP Engine
On every server behind the proxy that runs RP Engine, set proxy.enabled: true in plugins/RPEngine/config.yml and restart it.

# plugins/rpe-proxy/config.yml (on the proxy)
mode: serve
serve:
  port: 8183
  bind: "0.0.0.0"
  public-address: "http://play.example.com:8183"

# plugins/RPEngine/config.yml (on each server)
proxy:
  enabled: true

Serve or relay#

`mode`	What happens
`serve`	The default. The proxy keeps a copy of each pack, which the servers hand over the first time, and serves it on its own port.
`relay`	The proxy sends players the link their server would have sent. With RP Engine's default `host.mode: upload` that is ResourcePack AI's pack host, and nothing has to be opened. You still get one download per network join.

Good to know#

Servers with the same content share one pack. Two servers that build the same pack are the same pack to the proxy, even with PackSquash on, so moving between them is free. A server with different content (another bundle, say) sends its own, and the pack it no longer needs is taken off.
Copy RP Engine's data files between servers. Custom blocks are given block states in the order a server first saw them, kept in plugins/RPEngine/blocks.json and model-numbers.json. Give every server the same copies, or their packs differ and switching sends a new one.
Without RPE Proxy, nothing breaks. A player whose connection does not run through RPE Proxy is sent the pack by the server, as before, and the console says so once.
send.before-join is ignored with proxy.enabled: the proxy does the sending.