1 files changed, 11 insertions, 0 deletions
diff --git a/packages/taler-harness/src/harness/harness.ts b/packages/taler-harness/src/harness/harness.ts
index a9298637f..5b72cbc06 100644
--- a/packages/taler-harness/src/harness/harness.ts
+++ b/packages/taler-harness/src/harness/harness.ts
@@ -1081,6 +1081,17 @@ export class ExchangeService implements ExchangeServiceInterface {
     return this.exchangeConfig.httpPort;
   }
 
+  /**
+   * Run a function that modifies the existing exchange configuration.
+   * The modified exchange configuration will then be written to the
+   * file system.
+   */
+  async modifyConfig(f: (config: Configuration) => Promise<void>): Promise<void> {
+    const config = Configuration.load(this.configFilename);
+    await f(config);
+    config.write(this.configFilename);
+  }
+
   async addBankAccount(
     localName: string,
     exchangeBankAccount: HarnessExchangeBankAccount,