Copy plugins on server startup

- Copying everything as we can't copy while the server is running, so we need
to either know which plugins changed or just copy it all (since it needs to
be copied to both places)

.docker/server/Dockerfile

@@ -4,4 +4,4 @@ COPY .docker/server/start.sh ./
 
 WORKDIR /mcserver
 
-ENTRYPOINT ["sh", "/start.sh"]
+ENTRYPOINT ["bash", "/start.sh"]

src/index.ts

@@ -1,14 +1,20 @@
 import fetch from 'node-fetch';
 import { promises } from 'fs';
-import { ChildProcess, exec, ExecException } from 'child_process';
+import { exec, ExecException } from 'child_process';
 import * as chokidar from 'chokidar';
+import debounce from 'debounce';
 
 const running: {
-    process: ChildProcess,
+    watch: chokidar.FSWatcher,
     server1: boolean,
     serverName: () => string,
     prevServerName: () => string
-} = {process: null, server1: false, serverName: () => 'server' + (running.server1 ? '1' : '2'), prevServerName: () => 'server' + (running.server1 ? '2' : '1')};
+} = {
+    watch: null,
+    server1: false,
+    serverName: () => 'server' + (running.server1 ? '1' : '2'),
+    prevServerName: () => 'server' + (running.server1 ? '2' : '1')
+};
 
 async function main() {
     console.log("Checking for server updates...", "MC", process.env.MC_VERSION);
@@ -28,24 +34,28 @@ async function main() {
             console.log("Build downloaded", lastBuild.downloads.application.name);
         }
     }
+    const listener = async (changedPath) => {
+        console.log(`Plugin change detected at ${changedPath}, switching to ${running.prevServerName()}`);
         await startNextServer();
-    chokidar.watch(`/mcserver/${running.serverName()}/plugins/*.jar`).on('change', async () => { // TODO: Separate plugins dir
+    };
-        console.log("Plugin changes detected, restarting");
+    running.watch = chokidar.watch(`/mcserver/plugins/*.jar`).on('change', debounce(listener, 500));
     await startNextServer();
-    });
 }
 
 async function startNextServer() {
     running.server1 = !running.server1;
+    console.log("Copying plugin files to", running.serverName());
+    await promises.cp('/mcserver/plugins', `/mcserver/${running.serverName()}/plugins`, {recursive: true}); // TODO: Don't run servers as root
+    // TODO: Copy config files back to main plugins dir
     console.log("Starting server", running.server1 ? 'one' : 'two');
-    exec('docker compose -f /docker-compose.server.yml up -d '+running.serverName(), loggingCallback);
+    exec('docker compose -f /docker-compose.server.yml up -d ' + running.serverName(), loggingCallback);
     await waitForStartup();
     await stopPrevServer();
 }
 
 async function stopPrevServer() {
     console.log("Stopping previous server");
-    exec('docker compose -f /docker-compose.server.yml stop '+running.prevServerName(), loggingCallback);
+    exec('docker compose -f /docker-compose.server.yml stop ' + running.prevServerName(), loggingCallback);
 }
 
 function waitForStartup() {

src/package-lock.json

@@ -9,6 +9,7 @@
       "version": "1.0.0",
       "dependencies": {
         "chokidar": "^3.5.3",
+        "debounce": "^1.2.1",
         "node-fetch": "^3.2.6",
         "read-last-lines": "^1.8.0"
       },
@@ -124,6 +125,11 @@
         "node": ">= 12"
       }
     },
+    "node_modules/debounce": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/debounce/-/debounce-1.2.1.tgz",
+      "integrity": "sha512-XRRe6Glud4rd/ZGQfiV1ruXSfbvfJedlV9Y6zOlP+2K04vBYiJEte6stfFkCP03aMnY5tsipamumUjL14fofug=="
+    },
     "node_modules/duplexer": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.2.tgz",
@@ -653,6 +659,11 @@
       "resolved": "https://registry.npmjs.org/data-uri-to-buffer/-/data-uri-to-buffer-4.0.0.tgz",
       "integrity": "sha512-Vr3mLBA8qWmcuschSLAOogKgQ/Jwxulv3RNE4FXnYWRGujzrRWQI4m12fQqRkwX06C0KanhLr4hK+GydchZsaA=="
     },
+    "debounce": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/debounce/-/debounce-1.2.1.tgz",
+      "integrity": "sha512-XRRe6Glud4rd/ZGQfiV1ruXSfbvfJedlV9Y6zOlP+2K04vBYiJEte6stfFkCP03aMnY5tsipamumUjL14fofug=="
+    },
     "duplexer": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/duplexer/-/duplexer-0.1.2.tgz",

src/package.json

@@ -27,6 +27,7 @@
   },
   "dependencies": {
     "chokidar": "^3.5.3",
+    "debounce": "^1.2.1",
     "node-fetch": "^3.2.6",
     "read-last-lines": "^1.8.0"
   }