transactions - add a nonce check utility for ui use

app/scripts/controllers/transactions/index.js

@@ -111,6 +111,21 @@ class TransactionController extends EventEmitter {
     this.txStateManager.wipeTransactions(address)
   }
 
+  /**
+    Check if a txMeta in the list with the same nonce has been confirmed in a block
+    if the txParams dont have a nonce will return false
+    @returns {boolean} weather the nonce has been used in a transaction confirmed in a block
+    @param {object} txMeta - the txMeta object
+  */
+  async isNonceTaken (txMeta) {
+    const { from, nonce } = txMeta.txParams
+    if ('nonce' in txMeta.txParams) {
+      const sameNonceTxList = this.txStateManager.getFilteredTxList({from, nonce, status: 'confirmed'})
+      return (sameNonceTxList.length >= 1)
+    }
+    return false
+  }
+
   /**
   add a new unapproved transaction to the pipeline
 

app/scripts/metamask-controller.js

@@ -382,6 +382,7 @@ module.exports = class MetamaskController extends EventEmitter {
       updateTransaction: nodeify(txController.updateTransaction, txController),
       updateAndApproveTransaction: nodeify(txController.updateAndApproveTransaction, txController),
       retryTransaction: nodeify(this.retryTransaction, this),
+      isNonceTaken: nodeify(txController.isNonceTaken, txController),
 
       // messageManager
       signMessage: nodeify(this.signMessage, this),

test/unit/tx-controller-test.js

@@ -40,6 +40,36 @@ describe('Transaction Controller', function () {
     txController.nonceTracker.getNonceLock = () => Promise.resolve({ nextNonce: 0, releaseLock: noop })
   })
 
+  describe('#isNonceTaken', function () {
+    it('should return true', function (done) {
+      txController.txStateManager._saveTxList([
+        { id: 1, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 2, status: 'confirmed', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 3, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+      ])
+      txController.isNonceTaken({txParams: {nonce:0, from:'0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'}})
+      .then((isNonceTaken) => {
+        assert(isNonceTaken)
+        done()
+      }).catch(done)
+
+    })
+    it('should return false', function (done) {
+      txController.txStateManager._saveTxList([
+        { id: 1, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 2, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+        { id: 3, status: 'submitted', metamaskNetworkId: currentNetworkId, txParams: {nonce: 0, from: '0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'} },
+      ])
+
+      txController.isNonceTaken({txParams: {nonce:0, from:'0x8ACCE2391C0d510a6C5E5D8f819A678F79B7E675'}})
+      .then((isNonceTaken) => {
+        assert(!isNonceTaken)
+        done()
+      }).catch(done)
+
+    })
+  })
+
   describe('#getState', function () {
     it('should return a state object with the right keys and datat types', function () {
       const exposedState = txController.getState()