Added ability to start a server

app/MinecraftServer.js

@@ -1,3 +1,4 @@
+const { exec } = require("child_process");
 const fs = require('fs');
 
 class Server {
@@ -11,21 +12,44 @@ class Server {
     if (fs.existsSync(versionFilePath)) {
       this.version = fs.readFileSync(versionFilePath, {encoding:'utf8', flag:'r'});      
     }
-
-    // set server state
-    if (fs.existsSync(this.pidFilePath)) {
-      this.state = true;
-    } else {
-      this.state = false;
-    }
   }
 
   start() {
-    console.log('Starting server...');
+    console.log(`Starting server ${this.name}...`);
+
+    // create shell command and execute it
+    let cmd = `${this.rootDir}/start.sh`;
+    exec(cmd, (err, stdout, stderr) => {
+      if (err) {
+        console.log(`Error while starting server: ${error.message}`);
+      }
+
+      console.log(`Server ${this.name} has been started.`);
+    });
   }
 
   stop() {
-    console.log('Stopping server...');
+    console.log(`Stopping server ${this.name}...`);
+  }
+
+  getStatus() {
+    if (fs.existsSync(this.pidFilePath)) {
+      let pid = fs.readFileSync(this.pidFilePath, {encoding: 'utf8', flag: 'r'});
+      try {
+        return process.kill(pid, 0);
+      } catch (err) {
+        // ESRCH error means the process doesn't exist, so should return false
+        if (err.code !== 'ESRCH') {
+          console.error(err);
+          return err.code === 'EPERM';
+        } else {
+          // delete pid.txt so we don't have to worry about checking it again
+          fs.unlinkSync(this.pidFilePath);
+        }
+      }
+    }
+
+    return false
   }
 
   getPid() {

index.js

@@ -18,11 +18,13 @@ var serverRoutes = require('./routes/server');
 app.get('/', homeRoutes.getIndex);
 app.get('/server/create', serverRoutes.getCreate);
 app.post('/server/create', serverRoutes.postCreate);
+app.get('/server/:serverName/start', serverRoutes.getStart);
+app.get('/server/:serverName/stop', serverRoutes.getStop);
 
 // set Express to serve static files (ideally this is only used in development)
 app.use(express.static('./static/'));
 
 // start Express.js app
 app.listen(port, () => {
-  console.log(`Example app listening on port ${port}`);
+  console.log(`MCST has started and is listening on port ${port}.`);
 });

package-lock.json

@@ -9,6 +9,7 @@
       "version": "0.1.0",
       "license": "BSD-2-Clause",
       "dependencies": {
+        "config": "^3.3.8",
         "express": "^4.18.1",
         "pug": "^3.0.2"
       }
@@ -153,6 +154,17 @@
         "is-regex": "^1.0.3"
       }
     },
+    "node_modules/config": {
+      "version": "3.3.8",
+      "resolved": "https://registry.npmjs.org/config/-/config-3.3.8.tgz",
+      "integrity": "sha512-rFzF6VESOdp7wAXFlB9IOZI4ouL05g3A03v2eRcTHj2JBQaTNJ40zhAUl5wRbWHqLZ+uqp/7OE0BWWtAVgrong==",
+      "dependencies": {
+        "json5": "^2.2.1"
+      },
+      "engines": {
+        "node": ">= 10.0.0"
+      }
+    },
     "node_modules/constantinople": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/constantinople/-/constantinople-4.0.1.tgz",
@@ -462,6 +474,17 @@
       "resolved": "https://registry.npmjs.org/js-stringify/-/js-stringify-1.0.2.tgz",
       "integrity": "sha512-rtS5ATOo2Q5k1G+DADISilDA6lv79zIiwFd6CcjuIxGKLFm5C+RLImRscVap9k55i+MOZwgliw+NejvkLuGD5g=="
     },
+    "node_modules/json5": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.1.tgz",
+      "integrity": "sha512-1hqLFMSrGHRHxav9q9gNjJ5EXznIxGVO09xQRrwplcS8qs28pZ8s8hupZAmqDwZUmVZ2Qb2jnyPOWcDH8m8dlA==",
+      "bin": {
+        "json5": "lib/cli.js"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/jstransformer": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/jstransformer/-/jstransformer-1.0.0.tgz",
@@ -1051,6 +1074,14 @@
         "is-regex": "^1.0.3"
       }
     },
+    "config": {
+      "version": "3.3.8",
+      "resolved": "https://registry.npmjs.org/config/-/config-3.3.8.tgz",
+      "integrity": "sha512-rFzF6VESOdp7wAXFlB9IOZI4ouL05g3A03v2eRcTHj2JBQaTNJ40zhAUl5wRbWHqLZ+uqp/7OE0BWWtAVgrong==",
+      "requires": {
+        "json5": "^2.2.1"
+      }
+    },
     "constantinople": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/constantinople/-/constantinople-4.0.1.tgz",
@@ -1290,6 +1321,11 @@
       "resolved": "https://registry.npmjs.org/js-stringify/-/js-stringify-1.0.2.tgz",
       "integrity": "sha512-rtS5ATOo2Q5k1G+DADISilDA6lv79zIiwFd6CcjuIxGKLFm5C+RLImRscVap9k55i+MOZwgliw+NejvkLuGD5g=="
     },
+    "json5": {
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.1.tgz",
+      "integrity": "sha512-1hqLFMSrGHRHxav9q9gNjJ5EXznIxGVO09xQRrwplcS8qs28pZ8s8hupZAmqDwZUmVZ2Qb2jnyPOWcDH8m8dlA=="
+    },
     "jstransformer": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/jstransformer/-/jstransformer-1.0.0.tgz",

package.json

@@ -19,6 +19,7 @@
   "author": "Gregory Ballantine <gballantine@bitgoblin.tech>",
   "license": "BSD-2-Clause",
   "dependencies": {
+    "config": "^3.3.8",
     "express": "^4.18.1",
     "pug": "^3.0.2"
   }

routes/server.js

@@ -2,6 +2,7 @@ const config = require('config');
 const fs = require('fs');
 const https = require('https');
 const path = require('path');
+const minecraft = require('../app/MinecraftServer');
 
 exports.getCreate = function(req, res) {
   // render view
@@ -30,7 +31,7 @@ exports.postCreate = function(req, res) {
 
   // create the start.sh shell script
   scriptFilePath = path.join(serverDir, 'start.sh');
-  scriptContent = "#!/bin/sh\n\ncd " + serverDir + "\njava -Xmx2048M -Xms2048M -jar server_" + req.body.serverVersion + ".jar nogui";
+  scriptContent = "#!/bin/sh\n\ncd " + serverDir + "\njava -Xmx2048M -Xms2048M -jar server_" + req.body.serverVersion + ".jar nogui &\n\necho \"$!\" > ./pid.txt";
   fs.writeFileSync(scriptFilePath, scriptContent);
   fs.chmodSync(scriptFilePath, 0o755);
 
@@ -43,3 +44,27 @@ exports.postCreate = function(req, res) {
   // redirect the user back to the home page
   res.redirect('/');
 };
+
+exports.getStart = function(req, res) {
+  let serverName = req.params.serverName;
+  let rootDir = config.get('server_directory');
+  let server = new minecraft.Server(path.join(rootDir, serverName));
+
+  // start the server
+  server.start();
+
+  // redirect the user back to the home page
+  res.redirect('/');
+};
+
+exports.getStop = function(req, res) {
+  let serverName = req.params.serverName;
+  let rootDir = config.get('server_directory');
+  let server = new minecraft.Server(path.join(rootDir, serverName));
+
+  // stop the server
+  server.stop();
+
+  // redirect the user back to the home page
+  res.redirect('/');
+};

views/index.pug

@@ -24,7 +24,7 @@ block content
               tr.serverItem
                 td.serverName= m.name
                 td.serverVersion= m.version
-                td.serverState= m.state
+                td.serverState= m.getStatus()
                 td
                   a(href='/server/' + m.name + '/start') Start
                   a(href='/server/' + m.name + '/stop') Stop