Add warning log for disabled Logger mailer due to missing config

CHANGELOG.md

@@ -2,7 +2,15 @@
 
 All changes that impact users of this module are documented in this file, in the [Common Changelog](https://common-changelog.org) format with some additional specifications defined in the [engine CONTRIBUTING file](https://github.com/OpenTermsArchive/engine/blob/main/CONTRIBUTING.md#changelog). This codebase adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## Unreleased
+## Unreleased [patch]
+
+_Full changeset and discussions: [#3](https://github.com/OpenTermsArchive/engine/pull/3)._
+
+> Development of this release was supported by the [French Ministry for Foreign Affairs](https://www.diplomatie.gouv.fr/fr/politique-etrangere-de-la-france/diplomatie-numerique/) through its ministerial [State Startups incubator](https://beta.gouv.fr/startups/open-terms-archive.html) under the aegis of the Ambassador for Digital Affairs.
+
+### Added
+
+- Log a warning in case log emails cannot be sent because of a missing config
 
 ## 0.1.0 - 2023-12-05
 

src/utils/logger.js

@@ -11,22 +11,6 @@ const { combine, timestamp, printf, colorize } = winston.format;
 
 const transports = [new winston.transports.Console()];
 
-if (config.get('logger.sendMailOnError')) {
-  transports.push(new winston.transports.Mail({
-    to: config.get('logger.sendMailOnError.to'),
-    from: config.get('logger.sendMailOnError.from'),
-    host: config.get('logger.smtp.host'),
-    username: config.get('logger.smtp.username'),
-    password: process.env.SMTP_PASSWORD,
-    ssl: true,
-    timeout: 30 * 1000,
-    formatter: args => args[Object.getOwnPropertySymbols(args)[1]], // Returns the full error message, the same that is visible in the console. It is referenced in the argument object with a Symbol of which we do not have the reference to but we know it is the second one.
-    exitOnError: true,
-    level: 'error',
-    subject: `[OTA] [Federated API] Error — ${os.hostname()}`,
-  }));
-}
-
 const logger = winston.createLogger({
   format: combine(
     colorize(),
@@ -37,4 +21,29 @@ const logger = winston.createLogger({
   rejectionHandlers: transports,
 });
 
+if (config.get('logger.sendMailOnError')) {
+  if (process.env.SMTP_PASSWORD === undefined) {
+    logger.warn('Environment variable "SMTP_PASSWORD" was not found; log emails cannot be sent');
+  } else {
+    transports.push(new winston.transports.Mail({
+      to: config.get('logger.sendMailOnError.to'),
+      from: config.get('logger.sendMailOnError.from'),
+      host: config.get('logger.smtp.host'),
+      username: config.get('logger.smtp.username'),
+      password: process.env.SMTP_PASSWORD,
+      ssl: true,
+      timeout: 30 * 1000,
+      formatter: args => args[Object.getOwnPropertySymbols(args)[1]], // Returns the full error message, the same that is visible in the console. It is referenced in the argument object with a Symbol of which we do not have the reference to but we know it is the second one.
+      exitOnError: true,
+      level: 'error',
+      subject: `[OTA] [Federated API] Error — ${os.hostname()}`,
+    }));
+
+    logger.configure({
+      transports,
+      rejectionHandlers: transports,
+    });
+  }
+}
+
 export default logger;