structure gardening tool

tools/gardening/bin/compare_failures.dart

 // Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
 /// Compares the test log of a build step with previous builds.
 ///
 /// Use this to detect flakiness of failures, especially timeouts.
 
 import 'dart:async';
-import 'dart:convert';
 import 'dart:io';
 
-import 'src/buildbot_structures.dart';
-import 'src/util.dart';
+import 'package:gardening/src/buildbot_structures.dart';
+import 'package:gardening/src/util.dart';
 
 main(List<String> args) async {
   if (args.length != 1) {
     print('Usage: compare_failures <log-uri>');
     exit(1);
   }
   String url = args.first;
   if (!url.endsWith('/text')) {
     // Use the text version of the stdio log.
     url += '/text';
@@ skipping 15 matching lines @@
   summaries.add(firstSummary);
   if (firstSummary.hasFailures) {
     for (int i = 0; i < 10; i++) {
       buildUri = buildUri.prev();
       summaries.add(await readBuildResult(client, buildUri));
     }
   }
   return summaries;
 }
 
-/// Reads the content of [uri] as text.
-Future<String> readUriAsText(HttpClient client, Uri uri) async {
-  HttpClientRequest request = await client.getUrl(uri);
-  HttpClientResponse response = await request.close();
-  return UTF8.decode(await response.expand((l) => l).toList());
-}
-
 /// Parses the [buildUri] test log and creates a [BuildResult] for it.
 Future<BuildResult> readBuildResult(
     HttpClient client, BuildUri buildUri) async {
   Uri uri = buildUri.toUri();
   log('Reading $uri');
   String text = await readUriAsText(client, uri);
 
   bool inFailure = false;
   List<String> currentFailure;
   bool parsingTimingBlock = false;
@@ skipping 238 matching lines @@
     String archName = name.substring(0, slashPos);
     String testName = name.substring(slashPos + 1);
     timings.add(new Timing(
         uri,
         time,
         new TestStep(
             stepName, new TestConfiguration(configName, archName, testName))));
   }
   return timings;
 }