move to logging; check for safety exceptions

pkgs/sdk_triage_bot/bin/triage.dart

@@ -72,6 +72,7 @@ void main(List<String> arguments) async {
     force: force,
     githubService: githubService,
     geminiService: geminiService,
+    logger: Logger(),
   );
 
   client.close();

pkgs/sdk_triage_bot/lib/src/common.dart

@@ -41,3 +41,9 @@ String get geminiKey {
 String trimmedBody(String body) {
   return body.length > 4096 ? body = body.substring(0, 4096) : body;
 }
+
+class Logger {
+  void log(String message) {
+    print(message);
+  }
+}

pkgs/sdk_triage_bot/lib/src/gemini.dart

@@ -27,10 +27,16 @@ class GeminiService {
           httpClient: httpClient,
         );
 
+  /// Call the summarize model with the given prompt.
+  ///
+  /// On failures, this will throw a `GenerativeAIException`.
   Future<String> summarize(String prompt) {
     return _query(_summarizeModel, prompt);
   }
 
+  /// Call the classify model with the given prompt.
+  ///
+  /// On failures, this will throw a `GenerativeAIException`.
   Future<List<String>> classify(String prompt) async {
     final result = await _query(_classifyModel, prompt);
     final labels = result.split(',').map((l) => l.trim()).toList();

pkgs/sdk_triage_bot/lib/triage.dart

@@ -2,7 +2,10 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+import 'dart:io';
+
 import 'package:github/github.dart';
+import 'package:google_generative_ai/google_generative_ai.dart';
 
 import 'src/common.dart';
 import 'src/gemini.dart';
@@ -17,66 +20,85 @@ Future<void> triage(
   bool force = false,
   required GithubService githubService,
   required GeminiService geminiService,
+  required Logger logger,
 }) async {
-  print('Triaging $sdkSlug...');
-  print('');
+  logger.log('Triaging $sdkSlug...');
+  logger.log('');
 
   // retrieve the issue
   final issue = await githubService.fetchIssue(sdkSlug, issueNumber);
-  print('## issue ${issue.url}');
-  print('');
-  print('title: ${issue.title}');
+  logger.log('## issue "${issue.htmlUrl}"');
+  logger.log('');
   final labels = issue.labels.map((l) => l.name).toList();
   if (labels.isNotEmpty) {
-    print('labels: ${labels.join(', ')}');
+    logger.log('labels: ${labels.join(', ')}');
+    logger.log('');
   }
+  logger.log('"${issue.title}"');
+  logger.log('');
   final bodyLines =
       issue.body.split('\n').where((l) => l.trim().isNotEmpty).toList();
-  print('');
   for (final line in bodyLines.take(4)) {
-    print('  $line');
+    logger.log(line);
+  }
+  if (bodyLines.length > 4) {
+    logger.log('...');
   }
-  print('');
+  logger.log('');
 
   // decide if we should triage
   final alreadyTriaged = labels.any((l) => l.startsWith('area-'));
   if (alreadyTriaged && !force) {
-    print('Exiting (issue is already triaged).');
+    logger.log('Exiting (issue is already triaged).');
     return;
   }
 
   // ask for the summary
   var bodyTrimmed = trimmedBody(issue.body);
-  // TODO(devoncarew): handle safety failures
-  final summary = await geminiService.summarize(
-    summarizeIssuePrompt(title: issue.title, body: bodyTrimmed),
-  );
-  print('## gemini summary');
-  print('');
-  print(summary);
-  print('');
+  String summary;
+  try {
+    // Failures here can include things like gemini safety issues, ...
+    summary = await geminiService.summarize(
+      summarizeIssuePrompt(title: issue.title, body: bodyTrimmed),
+    );
+  } on GenerativeAIException catch (e) {
+    stderr.writeln('gemini: $e');
+    exit(1);
+  }
+
+  logger.log('## gemini summary');
+  logger.log('');
+  logger.log(summary);
+  logger.log('');
 
   // ask for the 'area-' classification
-  // TODO(devoncarew): handle safety failures
-  final classification = await geminiService.classify(
-    assignAreaPrompt(title: issue.title, body: bodyTrimmed),
-  );
-  print('## gemini classification');
-  print('');
-  print(classification);
-  print('');
+  List<String> classification;
+  try {
+    // Failures here can include things like gemini safety issues, ...
+    classification = await geminiService.classify(
+      assignAreaPrompt(title: issue.title, body: bodyTrimmed),
+    );
+  } on GenerativeAIException catch (e) {
+    stderr.writeln('gemini: $e');
+    exit(1);
+  }
+
+  logger.log('## gemini classification');
+  logger.log('');
+  logger.log(classification.toString());
+  logger.log('');
 
   if (dryRun) {
-    print('Exiting (dry run mode - not applying changes).');
+    logger.log('Exiting (dry run mode - not applying changes).');
     return;
   }
 
   // perform changes
-  print('## github comment');
-  print('');
-  print(summary);
-  print('');
-  print('labels: $classification');
+  logger.log('## github comment');
+  logger.log('');
+  logger.log(summary);
+  logger.log('');
+  logger.log('labels: $classification');
 
   var comment = '';
   if (classification.isNotEmpty) {
@@ -101,10 +123,10 @@ Future<void> triage(
     await githubService.addLabelsToIssue(sdkSlug, issueNumber, newLabels);
   }
 
-  print('');
-  print('---');
-  print('');
-  print('Triaged ${issue.url}.');
+  logger.log('');
+  logger.log('---');
+  logger.log('');
+  logger.log('Triaged ${issue.htmlUrl}.');
 }
 
 List<String> filterExistingLabels(

pkgs/sdk_triage_bot/test/fakes.dart

@@ -3,8 +3,10 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:github/github.dart';
+import 'package:sdk_triage_bot/src/common.dart';
 import 'package:sdk_triage_bot/src/gemini.dart';
 import 'package:sdk_triage_bot/src/github.dart';
+import 'package:test/test.dart';
 
 const int mockIssueNumber = 123;
 
@@ -55,3 +57,10 @@ class GeminiServiceStub implements GeminiService {
     return ['area-vm', 'type-bug'];
   }
 }
+
+class TestLogger implements Logger {
+  @override
+  void log(String message) {
+    printOnFailure(message);
+  }
+}

pkgs/sdk_triage_bot/test/triage_test.dart

@@ -17,6 +17,7 @@ void main() {
       mockIssueNumber,
       githubService: githubService,
       geminiService: geminiService,
+      logger: TestLogger(),
     );
 
     expect(githubService.updatedComment, isNotEmpty);
@@ -41,6 +42,7 @@ void main() {
       mockIssueNumber,
       githubService: githubService,
       geminiService: geminiService,
+      logger: TestLogger(),
     );
 
     expect(githubService.updatedComment, isNull);
@@ -61,9 +63,10 @@ void main() {
 
     await triage(
       mockIssueNumber,
+      force: true,
       githubService: githubService,
       geminiService: geminiService,
-      force: true,
+      logger: TestLogger(),
     );
 
     expect(githubService.updatedComment, isNotEmpty);