2 files changed, 28 insertions, 1 deletions

diff --git a/app/scripts/lib/pending-tx-tracker.js b/app/scripts/lib/pending-tx-tracker.js
index 8a626e222..df504c126 100644
--- a/app/scripts/lib/pending-tx-tracker.js
+++ b/app/scripts/lib/pending-tx-tracker.js
@@ -25,7 +25,9 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
     // default is one day
     this.retryTimePeriod = config.retryTimePeriod || 86400000
     this.getPendingTransactions = config.getPendingTransactions
+    this.getCompletedTransactions = config.getCompletedTransactions
     this.publishTransaction = config.publishTransaction
+    this._checkPendingTxs()
   }
 
   //  checks if a signed tx is in a block and
@@ -120,6 +122,7 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
   async _checkPendingTx (txMeta) {
     const txHash = txMeta.hash
     const txId = txMeta.id
+
     // extra check in case there was an uncaught error during the
     // signature and submission process
     if (!txHash) {
@@ -128,6 +131,15 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
       this.emit('tx:failed', txId, noTxHashErr)
       return
     }
+
+    // If another tx with the same nonce is mined, set as failed.
+    const taken = await this._checkIfNonceIsTaken(txMeta)
+    if (taken) {
+      const nonceTakenErr = new Error('Another transaction with this nonce has been mined.')
+      nonceTakenErr.name = 'NonceTakenErr'
+      return this.emit('tx:failed', txId, nonceTakenErr)
+    }
+
     // get latest transaction status
     let txParams
     try {
@@ -159,4 +171,13 @@ module.exports = class PendingTransactionTracker extends EventEmitter {
     }
     nonceGlobalLock.releaseLock()
   }
+
+  async _checkIfNonceIsTaken (txMeta) {
+    const completed = this.getCompletedTransactions()
+    const sameNonce = completed.filter((otherMeta) => {
+      return otherMeta.txParams.nonce === txMeta.txParams.nonce
+    })
+    return sameNonce.length > 0
+  }
+
 }
diff --git a/app/scripts/lib/tx-state-manager.js b/app/scripts/lib/tx-state-manager.js
index cf8117864..2250403f6 100644
--- a/app/scripts/lib/tx-state-manager.js
+++ b/app/scripts/lib/tx-state-manager.js
@@ -46,6 +46,12 @@ module.exports = class TransactionStateManger extends EventEmitter {
     return this.getFilteredTxList(opts)
   }
 
+  getConfirmedTransactions (address) {
+    const opts = { status: 'confirmed' }
+    if (address) opts.from = address
+    return this.getFilteredTxList(opts)
+  }
+
   addTx (txMeta) {
     this.once(`${txMeta.id}:signed`, function (txId) {
       this.removeAllListeners(`${txMeta.id}:rejected`)
@@ -242,4 +248,4 @@ module.exports = class TransactionStateManger extends EventEmitter {
   _saveTxList (transactions) {
     this.store.updateState({ transactions })
   }
-}
\ No newline at end of file
+}