wallet: create cancel lock

Author: Mark Tyneway

lib/wallet/wallet.js

@@ -2763,32 +2763,52 @@ class Wallet extends EventEmitter {
   }
 
   /**
-   * Create and finalize a cancel MTX.
+   * Create and finalize a cancel
+   * MTX without a lock.
    * @param {String} name
    * @param {Object} options
    * @returns {MTX}
    */
 
-  async createCancel(name, options) {
+  async _createCancel(name, options) {
     const mtx = await this.makeCancel(name);
     await this.fill(mtx, options);
     return this.finalize(mtx, options);
   }
 
   /**
-   * Create and send a cancel MTX.
+   * Create and finalize a cancel
+   * MTX with a lock.
+   * @param {String} name
+   * @param {Object} options
+   * @returns {MTX}
+   */
+
+  async createCancel(name, options) {
+    const unlock = await this.fundLock.lock();
+    try {
+      return await this._createCancel(name, options);
+    } finally {
+      unlock();
+    }
+  }
+
+  /**
+   * Create and send a cancel
+   * MTX without a lock.
    * @param {String} name
    * @param {Object} options
    */
 
   async _sendCancel(name, options) {
     const passphrase = options ? options.passphrase : null;
-    const mtx = await this.createCancel(name, options);
+    const mtx = await this._createCancel(name, options);
     return this.sendMTX(mtx, passphrase);
   }
 
   /**
-   * Create and send a cancel MTX.
+   * Create and send a cancel
+   * MTX with a lock.
    * @param {String} name
    * @param {Object} options
    */