Store error when persistTransaction fails.

  * This tells the user to stop polling /getConfirmedTransaction because
    the transaction will never be confirmed.

packages/request-node/src/request/confirmedTransactionStore.ts

@@ -7,21 +7,21 @@ import Keyv, { Store } from 'keyv';
  * The client can call the getConfirmed entry point, to get the confirmed event.
  */
 export default class ConfirmedTransactionStore {
-  private store: Keyv<DataAccessTypes.IReturnPersistTransactionRaw>;
+  private store: Keyv<DataAccessTypes.IReturnPersistTransactionRaw | Error>;
 
   /**
    * Confirmed transactions store constructor
    */
-  constructor(store?: Store<DataAccessTypes.IReturnPersistTransaction>) {
-    this.store = new Keyv<DataAccessTypes.IReturnPersistTransaction>({
+  constructor(store?: Store<DataAccessTypes.IReturnPersistTransaction | Error>) {
+    this.store = new Keyv<DataAccessTypes.IReturnPersistTransaction | Error>({
       namespace: 'ConfirmedTransactions',
       store,
     });
   }
 
   public async getConfirmedTransaction(
     transactionHash: string,
-  ): Promise<DataAccessTypes.IReturnPersistTransactionRaw | undefined> {
+  ): Promise<DataAccessTypes.IReturnPersistTransactionRaw | Error | undefined> {
     return this.store.get(transactionHash);
   }
 
@@ -37,4 +37,14 @@ export default class ConfirmedTransactionStore {
   ): Promise<void> {
     await this.store.set(transactionHash, result);
   }
+
+  /**
+   * Stores the error
+   *
+   * @param transactionHash hash of the transaction
+   * @param error error of the event "error"
+   */
+  public async addFailedTransaction(transactionHash: string, error: Error): Promise<void> {
+    await this.store.set(transactionHash, error);
+  }
 }

packages/request-node/src/request/persistTransaction.ts

@@ -84,7 +84,11 @@ export default class PersistTransactionHandler {
       });
 
       // when the transaction fails, log an error
-      dataAccessResponse.on('error', async (e) => {
+      dataAccessResponse.on('error', async (e: unknown) => {
+        await this.confirmedTransactionStore.addFailedTransaction(
+          transactionHash.value,
+          e as Error,
+        );
         this.logger.error(`persistTransaction error: ${e}\n
           transactionHash: ${transactionHash.value}, channelId: ${
           clientRequest.body.channelId