feat: add option to persist old worlds after restarting the server

README.md

@@ -35,7 +35,8 @@ _Note: Enabling flight will prevent random disconnects when traveling too fast v
     "WHITELIST": ["Notch"], // List of whitelisted players
     "DATA_PACK": false, // set to true, if datapacks should be copied into the world
     "SEEDS": ["-9223372036854775808", "9223372036854775807"], // List of set seeds that are played one by one, set [] to disable this option
-    "AUTO_SAVE":  false // Turn off to prevent 5 minute lag, default false
+    "AUTO_SAVE":  false, // Turn off to prevent 5 minute lag, default false
+    "KEEP_WORLDS":  false // Turn on if worlds should be renamed instead of deleted, default false
 }
 ```
 

example/speedrun.json

@@ -5,5 +5,6 @@
 	"WHITELIST": ["Notch"],
 	"DATA_PACK": false,
 	"SEEDS": ["-9223372036854775808", "9223372036854775807"],
-	"AUTO_SAVE": false
+	"AUTO_SAVE": false,
+	"KEEP_WORLDS": false
 }

src/adapter/world.spec.ts

@@ -0,0 +1,19 @@
+import { renameWorldFolder } from "./world"
+const shell = require("shelljs")
+
+describe("World", () => {
+	beforeEach(() => {
+		Object.assign(shell, {
+			mv: jest.fn()
+		})
+		Date.now = jest.fn().mockReturnValue(new Date(Date.UTC(2021, 4, 21, 15, 31, 24)).valueOf())
+	})
+
+	describe("renameWorldFolder", () => {
+		it("should rename a world and postfix it with a time", () => {
+			renameWorldFolder()
+
+			expect(shell.mv).toHaveBeenCalledWith("world", "world_2021-05-21_15-31-24")
+		})
+	})
+})

src/adapter/world.ts

@@ -1,6 +1,16 @@
 import rimraf from "rimraf"
+import shell from "shelljs"
 
 export function deleteWorldFolder() {
 	console.log("Deleting world folder ...")
 	rimraf.sync("world")
 }
+
+export function renameWorldFolder() {
+	const isoString = new Date(Date.now()).toISOString()
+	const end = isoString.lastIndexOf(".")
+	const timeString = isoString.replace(/:/g, "-").replace("T", "_").slice(0, end)
+	const renamedWorldFolder = `world_${timeString}`
+	console.log(`Renaming world folder to ${renamedWorldFolder}`)
+	shell.mv("world", renamedWorldFolder)
+}

src/model/configuration.ts

@@ -6,4 +6,5 @@ export interface Configuration {
 	DATA_PACK: boolean
 	SEEDS: string[]
 	AUTO_SAVE: boolean
+	KEEP_WORLDS: boolean
 }

src/server.ts

@@ -2,15 +2,19 @@ import { ChildProcess, spawn } from "child_process"
 import shell from "shelljs"
 import { parseConfiguration } from "./adapter/configuration"
 import { initSeed } from "./adapter/serverProperties"
-import { deleteWorldFolder } from "./adapter/world"
+import { deleteWorldFolder, renameWorldFolder } from "./adapter/world"
 
 async function startServer() {
 	setupErrorListeners()
 
 	const configuration = await parseConfiguration()
-	const { MIN_RAM, MAX_RAM, OP, WHITELIST, DATA_PACK, SEEDS, AUTO_SAVE } = configuration
+	const { MIN_RAM, MAX_RAM, OP, WHITELIST, DATA_PACK, SEEDS, AUTO_SAVE, KEEP_WORLDS } = configuration
 
-	deleteWorldFolder()
+	if (KEEP_WORLDS) {
+		renameWorldFolder()
+	} else {
+		deleteWorldFolder()
+	}
 	await initSeed(SEEDS, configuration)
 
 	const server = spawn("java", [`-Xms${MIN_RAM}G`, `-Xmx${MAX_RAM}G`, "-jar", "server.jar", "nogui"])