wdb: add events for open/close and connect/disconnect.

CHANGELOG.md

@@ -8,6 +8,7 @@ you run it for the first time.**
 ### Wallet Changes:
 
 - Add migration that recalculates txdb balances to fix any inconsistencies.
+- WalletDB Now emits events for: `open`, `close`, `connect`, `disconnect`.
 - HTTP Changes:
   - All transaction creating endpoints now accept `hardFee` for specifying the
     exact fee.

lib/wallet/walletdb.js

@@ -122,6 +122,7 @@ class WalletDB extends EventEmitter {
     });
 
     this.client.on('connect', async () => {
+      this.emit('connect');
       try {
         await this.syncNode();
         this.emit('sync done', this.state);
@@ -131,6 +132,7 @@ class WalletDB extends EventEmitter {
     });
 
     this.client.on('disconnect', async () => {
+      this.emit('disconnect');
       this.filterSent = false;
     });
 
@@ -225,6 +227,9 @@ class WalletDB extends EventEmitter {
       this.logger.info('Rescanning...');
       await this.scan(0);
     }
+
+    this.logger.info('WalletDB opened.');
+    this.emit('open');
   }
 
   /**
@@ -277,7 +282,9 @@ class WalletDB extends EventEmitter {
       this.unregister(wallet);
     }
 
-    return this.db.close();
+    await this.db.close();
+    this.logger.info('WalletDB Closed.');
+    this.emit('close');
   }
 
   /**