wallet: preload all wallets before HTTP server is started.

lib/wallet/node.js

@@ -52,7 +52,8 @@ class WalletNode extends Node {
       wipeNoReally: this.config.bool('wipe-no-really'),
       spv: this.config.bool('spv'),
       migrate: this.config.uint('migrate'),
-      checkLookahead: this.config.bool('check-lookahead', false)
+      checkLookahead: this.config.bool('check-lookahead', false),
+      preloadAll: this.config.bool('preload-all', false)
     });
 
     this.rpc = new RPC(this);

lib/wallet/plugin.js

@@ -54,7 +54,8 @@ class Plugin extends EventEmitter {
       wipeNoReally: this.config.bool('wipe-no-really'),
       spv: node.spv,
       migrate: this.config.uint('migrate'),
-      checkLookahead: this.config.bool('check-lookahead', false)
+      checkLookahead: this.config.bool('check-lookahead', false),
+      preloadAll: this.config.bool('preload-all', false)
     });
 
     this.rpc = new RPC(this);

lib/wallet/walletdb.js

@@ -210,6 +210,7 @@ class WalletDB extends EventEmitter {
     await this.migrateChange();
 
     await this.checkLookahead();
+    await this.preloadAll();
   }
 
   /**
@@ -304,6 +305,27 @@ class WalletDB extends EventEmitter {
     await b.write();
   }
 
+  /**
+   * Preload/open all wallets on open.
+   * @returns {Promise}
+   */
+
+  async preloadAll() {
+    if (!this.options.preloadAll)
+      return;
+
+    this.logger.info('Preloading all wallets...');
+
+    const wids = await this.db.keys({
+      gte: layout.W.min(),
+      lte: layout.W.max(),
+      parse: key => layout.W.decode(key)[0]
+    });
+
+    for (const wid of wids)
+      await this._get(wid);
+  }
+
   /**
    * Verify network.
    * @returns {Promise}
@@ -2519,6 +2541,7 @@ class WalletOptions {
     this.wipeNoReally = false;
     this.migrate = null;
     this.checkLookahead = false;
+    this.preloadAll = false;
 
     if (options)
       this.fromOptions(options);
@@ -2606,6 +2629,10 @@ class WalletOptions {
       this.checkLookahead = options.checkLookahead;
     }
 
+    if (options.preloadAll != null) {
+      assert(typeof options.preloadAll === 'boolean');
+      this.preloadAll = options.preloadAll;
+    }
     return this;
   }