feat: add HyperDB replication to file.drop plugin

- Add database watcher to monitor @filedrop/files collection changes
- Implement robust database initialization with retry logic (30 attempts)
- Add replication status checking and logging on startup
- Add peer connection handlers for active replication updates
- Enable real-time database synchronization across P2NS network

includes/plugins/channel-manager.js

@@ -470,7 +470,7 @@ function createPluginChannelsForPeer(peerId, conn, mux) {
                         return;
                       }
                       setRecreating(pluginDomain, protocol, peerId);
-                      peerChannel.lastReopenAttempt = now;
+                      peerChannel.lastReopenAttempt = Date.now();
                       logDebug('ChannelManager', `Channel ${fullProtocol} fully closed, recreating for peer ${peerId.substring(0, 16)}...`);
                       // Remove old channel reference
                       channelInfo.peerChannels.delete(peerId);

plugin-sites/file.drop/index.js

@@ -14,6 +14,7 @@
 
 const sdk = require('../../includes/plugins/sdk');
 const crypto = require('crypto');
+const { setupDatabaseWatcher } = require('./watcher');
 
 const DRIVE_NAME = 'uploads';
 const EXPIRY_MS = 24 * 60 * 60 * 1000; // 24 hours
@@ -425,9 +426,81 @@ async function onInit() {
   localDriveKey = driveInfo.key;
   sdk.log.info('file.drop', `Local drive key: ${localDriveKey.slice(0, 16)}...`);
 
-  // Wait for database
+  // Wait for database to be available with retries
+  let dbReady = false;
+  for (let i = 0; i < 30; i++) {
+    try {
       await sdk.db.ready();
+      if (!sdk.db.closed) {
+        dbReady = true;
         sdk.log.info('file.drop', 'HyperDB ready');
+        break;
+      }
+    } catch (err) {
+      if (err.message && err.message.includes('Database not initialized')) {
+        sdk.log.debug('file.drop', `Database not ready yet, attempt ${i + 1}/30`);
+      } else {
+        sdk.log.warn('file.drop', `Database error on attempt ${i + 1}/30: ${err.message}`);
+      }
+    }
+    await new Promise(resolve => setTimeout(resolve, 1000)); // Wait 1 second
+  }
+
+  if (!dbReady) {
+    sdk.log.warn('file.drop', 'Database not available after 30 seconds - plugin will continue but database operations may fail');
+  }
+
+  // Verify replication is enabled
+  try {
+    const dbReplication = sdk.db.replication;
+    if (dbReplication) {
+      const dbStatus = dbReplication.getStatus();
+      if (dbStatus && dbStatus.active) {
+        sdk.log.info('file.drop', `Database replication active (${dbStatus.peers} peers)`);
+      } else {
+        sdk.log.info('file.drop', 'Database replication will be enabled automatically');
+      }
+    }
+  } catch (err) {
+    sdk.log.debug('file.drop', `Could not check database replication status: ${err.message}`);
+  }
+
+  // Setup database watcher (async, but don't wait - it will handle errors internally)
+  setupDatabaseWatcher().catch(err => {
+    sdk.log.error('file.drop', `Error in database watcher setup: ${err.message}`);
+  });
+
+  // Watch for peer connections/disconnections to trigger active replication updates
+  sdk.events.on('peer-connected', async (data) => {
+    // Trigger active replication update when peer connects (backup mechanism)
+    // The replication manager will also handle this, but this ensures updates happen
+    try {
+      // Give replication a moment to establish
+      await new Promise(resolve => setTimeout(resolve, 1000));
+
+      // Check if database replication is active and trigger update
+      const dbReplication = sdk.db.replication;
+      if (dbReplication && dbReplication.isActive()) {
+        const dbManager = require('../../includes/plugins/db-manager');
+        const core = dbManager.getPluginCore('file.drop');
+        if (core && !core.closed) {
+          const oldLength = core.length;
+          await core.update({ wait: true });
+          const newLength = core.length;
+          if (newLength > oldLength) {
+            sdk.log.info('file.drop', `Database updated after peer ${data.peerId.slice(0, 16)} connection, length: ${oldLength} -> ${newLength}`);
+          }
+        }
+      }
+    } catch (err) {
+      sdk.log.debug('file.drop', `Error triggering replication update after peer connection: ${err.message}`);
+    }
+  });
+
+  sdk.events.on('peer-disconnected', async (data) => {
+    // Peer disconnection handling - minimal implementation for consistency
+    sdk.log.debug('file.drop', `Peer disconnected: ${data.peerId.slice(0, 16)}...`);
+  });
 
   // Run initial cleanup
   await cleanupExpiredFiles();

plugin-sites/file.drop/watcher.js

@@ -0,0 +1,69 @@
+/**
+ * File Drop Plugin - Database Watcher
+ *
+ * Handles database change watching for file metadata updates
+ */
+
+const sdk = require('../../includes/plugins/sdk');
+
+/**
+ * Watch for database changes and log updates
+ */
+async function setupDatabaseWatcher() {
+  // Wait for database to be available with retries
+  let retries = 30;
+  while (retries > 0) {
+    try {
+      await sdk.db.ready();
+      if (!sdk.db.closed) {
+        sdk.db.watch(async (...args) => {
+          try {
+            const update = args[0];
+
+            // Check if we have a valid update for file changes
+            if (update && typeof update === 'object' && update.collection === '@filedrop/files') {
+              sdk.log.info('file.drop', `Database watcher detected file change: ${JSON.stringify(update)}`);
+
+              // For now, just log the change. Future enhancements could include:
+              // - Broadcasting file updates via WebSocket
+              // - Notifying other peers of file changes
+              // - Updating UI with real-time file status
+
+              const fileId = update.key?.id;
+              if (fileId) {
+                sdk.log.info('file.drop', `File metadata updated: ${fileId}`);
+              } else {
+                sdk.log.debug('file.drop', 'File change detected but no file ID available');
+              }
+            } else if (update) {
+              sdk.log.debug('file.drop', `Database watcher received update for different collection: ${update.collection || 'unknown'}`);
+            }
+            // Ignore other update types or setup calls
+          } catch (err) {
+            sdk.log.error('file.drop', `Error in database watcher: ${err.message}`);
+          }
+        });
+        sdk.log.info('file.drop', 'Database watcher set up');
+        return;
+      }
+    } catch (err) {
+      // Database not ready yet, continue waiting
+      if (err.message && err.message.includes('Database not initialized')) {
+        retries--;
+        await new Promise(resolve => setTimeout(resolve, 1000)); // Wait 1 second
+        continue;
+      }
+      // Other error - log and return
+      sdk.log.error('file.drop', `Error setting up database watcher: ${err.message}`);
+      return;
+    }
+    break;
+  }
+  if (retries === 0) {
+    sdk.log.warn('file.drop', 'Database watcher setup timed out - database not available after 30 seconds');
+  }
+}
+
+module.exports = {
+  setupDatabaseWatcher
+};