Pass 409 Conflict back to FireFly Core

Signed-off-by: Andrew Richardson <andrew.richardson@kaleido.io>

src/tokens/blockchain.service.ts

@@ -18,6 +18,8 @@ import { ClientRequest } from 'http';
 import { HttpService } from '@nestjs/axios';
 import axios, { AxiosRequestConfig, AxiosResponse } from 'axios';
 import {
+  ConflictException,
+  HttpStatus,
   Injectable,
   InternalServerErrorException,
   Logger,
@@ -96,7 +98,13 @@ export class BlockchainConnectorService {
         this.logger.warn(
           `${request?.path} <-- HTTP ${response?.status} ${response?.statusText}: ${errorMessage}`,
         );
-        throw new InternalServerErrorException(errorMessage);
+        if (response?.status === HttpStatus.CONFLICT) {
+          // Pass a 409 through
+          throw new ConflictException(errorMessage);
+        } else {
+          // Otherwise always return a 500 if the blockchain connector request wasn't successful
+          throw new InternalServerErrorException(errorMessage);
+        }
       }
       throw err;
     });