add TYPE Limbo

[rampd2]

I had the idea to add the server TYPE Limbo, because it's a standalone server (.jar) and not just any plugin etc.

I'm not sure if I understand the code enough to implement it, but just wanted to add my idea here and maybe later implement/contribute (to) it.

What is Limbo

A Limbo Minecraft Server is just a standalone (non forge, bukkit, spigot, fabric, sponge...) mc server which is a for every player independent newly predefined generated world (as far as I understood). It can for example be used as a afk server or if the server is full (queue).

If you need an example, there is the official __ of __ here (join in mc): mc.loohpjames.com Also the popular server Hypixel.net seems to have a limbo server, used as a afk space.

Full Links

Spigotmc.org: https://www.spigotmc.org/resources/limbo-standalone-server-lightweight-solution-for-afk-or-waiting-rooms-in-your-server-network.82468/ Github repo: https://github.com/LOOHP/Limbo His Jenkins build server: http://ci.loohpjames.com/job/Limbo/

[itzg]

Speaking of the links, that server type would go well with the bungeecord image I also maintain. This server type sounds like it should be easy to add. I'm out of town visiting family for a few days so I'll get to it after I get back.

[itzg]

Limbo is now supported by the latest image

https://github.com/itzg/docker-minecraft-server#running-a-limbo-server

[rampd2]

Thank you for the implementation. I hope this answer is not "too late". I tried Limbo now twice but with no success (once with docker-compose, once with raw docker command).

The part that is a bit irritating to me, at least until I saw the code is that the file is named purpur-56.jar: https://github.com/itzg/docker-minecraft-server/blob/f5ea43b3d3699783588eecd6545f3b7b75fddb58/start-deployLimbo#L29

command:

docker run --rm -it -p 25560:25565 -e EULA=true -e TYPE=LIMBO --name limbo-test itzg/minecraft-server

compose:

version: "3.8"

#...

limbo1:
  image: itzg/minecraft-server:latest
  ports:
    - 25599:25565
  networks:
    - some-network-for-later
  environment:
    - TYPE=LIMBO
    - EULA=TRUE
  volumes:
    - ./limbo1-data:/data
    - /etc/timezone:/etc/timezone:ro

console + console error (maybe not the problem, just healthcheck ping that isn't handled correctly?):

[init] Running as uid=1000 gid=1000 with /data as 'drwxrwxr-x 2 1000 1000 4096 Aug 10 ti:me /data'
[init] Resolved version given LATEST into 1.17.1
[init] Resolving type given LIMBO
[init] Downloading Limbo from https://ci.loohpjames.com/job/Limbo/lastStableBuild/artifact/target/Limbo-0.6.1-ALPHA-1.17.1.jar ...
[init] Downloading default schem file
[init] Creating server.properties in /data/server.properties
[init] Disabling whitelist
[init] Setting whitelist to 'false' in /data/server.properties
[init] Setting white-list to 'false' in /data/server.properties
[init] Adding server-name with 'Dedicated Server' in /data/server.properties
[init] Setting server-port to '25565' in /data/server.properties
[init] Setting motd to 'A Limbo Minecraft Server powered by Docker' in /data/server.properties
[init] Setting enable-rcon to 'true' in /data/server.properties
[init] Setting rcon.password to 'minecraft' in /data/server.properties
[init] Setting rcon.port to '25575' in /data/server.properties
[init] Setting level-name to 'Default;default.schem;default.schem' in /data/server.properties
[init] Setting online-mode to 'true' in /data/server.properties
[init] Checking for JSON files.
[init] Setting initial memory to 1G and max to 1G
[init] Starting the Minecraft server...
Aug 28, 2021 [my time] org.jline.utils.Log logr
WARNING: Unable to create a system terminal, creating a dumb terminal (enable debug logging for more information)
[Info] Loading Limbo Version 0.6.1-ALPHA on Minecraft 1.17.1
[Info] No server-icon.png found
[Info] Loaded server.properties
[Info] If you are using bungeecord, consider turning that on in the settings!
[Info] Loading packet id mappings from mapping.json ...
[Info] Loaded all 40 packet id mappings!
[Info] Loading world minecraft:Default with the schematic file default.schem ...
[Info] Loaded world minecraft:Default!
[Info] Loading limbo default commands module...
[Info] Loading plugin LimboDefaultCmd.jar 1.0 by LOOHP
[Info] Enabling plugin LimboDefaultCmd 1.0
[Info] Limbo server listening on /localhost:25565

[Info] [/localhost:39270] <-> Handshake Status has pinged
[Error]com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 4 path $
[Error]        at com.google.gson.JsonParser.parse(JsonParser.java:65)
[Error]        at com.google.gson.JsonParser.parse(JsonParser.java:45)
[Error]        at net.md_5.bungee.chat.ComponentSerializer.parse(ComponentSerializer.java:48)
[Error]        at com.loohp.limbo.server.ClientConnection.run(ClientConnection.java:238)
[Error]Caused by: com.google.gson.stream.MalformedJsonException: Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 4 path $
[Error]        at com.google.gson.stream.JsonReader.syntaxError(JsonReader.java:1568)
[Error]        at com.google.gson.stream.JsonReader.checkLenient(JsonReader.java:1409)
[Error]        at com.google.gson.stream.JsonReader.doPeek(JsonReader.java:542)
[Error]        at com.google.gson.stream.JsonReader.peek(JsonReader.java:425)
[Error]        at com.google.gson.JsonParser.parse(JsonParser.java:60)
[Error]        ... 3 more

client (1.8.9 and vanilla 1.17.1) error:

java.net.ConnectException: Connection refused: no further information: ...

[itzg]

Oops, the "purpur" mention was a left over from copy-pasting that source file 😬 I'll fix that up.

Otherwise...

...the healthcheck behavior is quite strange and I'm not sure what to do about it yet other than documenting setting DISABLE_HEALTHCHECK=true to avoid that.

...and I finally noticed that it's binding to localhost instead of 0.0.0.0, so I'll explore what's going on there.

[itzg]

Fixed the binding by explicitly setting SERVER_IP in the limbo setup; however, now I'm wondering how to solve

[itzg]

Apparently it namespaces the level-name property, so it gets a prefix minecraft::

https://github.com/LOOHP/Limbo/blob/7d8208272f119ecda0d85bd8f8d21b01597ec1e3/src/main/java/com/loohp/limbo/file/ServerProperties.java#L82

I'll push the changes so far and @DanielRamp maybe you can help investigate what might be wrong.

[gmemstr]

~~I'm curious if anyone has had a chance to dig into the error @itzg pointed out regarding the "character in path of location" message. Hitting this same issue and not getting very far with my own investigations.~~

Turns out, you can just set LEVEL to something like world;spawn.schem (replacing spawm.schem with your schema) and it just works. Rereading the message, it seems Minecraft world names can only be lowercase, but it defaulted to uppercase in the config.