Fix file permissions issue in Docker container - add fallback to in-memory storage

Dockerfile

@@ -17,6 +17,10 @@ COPY . .
 RUN addgroup -g 1001 -S nodejs
 RUN adduser -S nodejs -u 1001
 
+# Ensure devices.json exists and has proper permissions
+RUN touch /app/devices.json && \
+    chmod 664 /app/devices.json
+
 # Change ownership of the app directory to the nodejs user
 RUN chown -R nodejs:nodejs /app
 

server.js

@@ -62,6 +62,9 @@ const path = require('path');
 // File storage for FCM tokens
 const DEVICES_FILE = path.join(__dirname, 'devices.json');
 
+// Fallback to in-memory storage if file operations fail
+let fileOperationsEnabled = true;
+
 // Load devices from file or create empty storage
 let deviceTokens = new Map();
 
@@ -74,20 +77,37 @@ function loadDevicesFromFile() {
       console.log(`📁 Loaded ${deviceTokens.size} devices from file`);
     } else {
       console.log('📁 No devices file found, starting fresh');
+      // Try to create an empty file to test write permissions
+      try {
+        fs.writeFileSync(DEVICES_FILE, '[]');
+        console.log('📁 Created empty devices file');
+      } catch (writeError) {
+        console.warn('⚠️ Cannot create devices file, will use in-memory storage only');
+        fileOperationsEnabled = false;
+      }
     }
   } catch (error) {
     console.error('❌ Error loading devices file:', error);
+    console.log('⚠️ Using in-memory storage only');
+    fileOperationsEnabled = false;
     deviceTokens = new Map();
   }
 }
 
 function saveDevicesToFile() {
+  if (!fileOperationsEnabled) {
+    console.log('💾 File operations disabled, keeping devices in memory only');
+    return;
+  }
+  
   try {
     const devicesArray = Array.from(deviceTokens.entries());
     fs.writeFileSync(DEVICES_FILE, JSON.stringify(devicesArray, null, 2));
     console.log(`💾 Saved ${deviceTokens.size} devices to file`);
   } catch (error) {
     console.error('❌ Error saving devices file:', error);
+    console.log('⚠️ Disabling file operations, using in-memory storage only');
+    fileOperationsEnabled = false;
   }
 }
 
@@ -101,7 +121,9 @@ app.get('/', (req, res) => {
   res.json({
     message: 'Houzou Medical Notification Server',
     status: 'running',
-    timestamp: new Date().toISOString()
+    timestamp: new Date().toISOString(),
+    fileOperationsEnabled: fileOperationsEnabled,
+    deviceCount: deviceTokens.size
   });
 });