Additional tools for gardening.

tools/gardening/lib/src/luci_services.dart

Index: tools/gardening/lib/src/luci_services.dart
diff --git a/tools/gardening/lib/src/luci_services.dart b/tools/gardening/lib/src/luci_services.dart
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+++ b/tools/gardening/lib/src/luci_services.dart
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+// 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.
+
+import 'dart:async';
+import 'try.dart';
+import 'logger.dart';
+import 'cache_new.dart';
+import 'luci_api.dart';
+
+/// Fetches all builds for a given [commit]-hash, by searching the latest
+/// [amount] builds.
+Future<Try<List<BuildDetail>>> fetchBuildsForCommmit(LuciApi api, Logger logger,
+    String client, String commit, CreateCacheFunction createCache,
+    [int amount = 1]) async {
+  logger.debug("Finding primary bots for client $client");
+  var buildBots = await api.getPrimaryBuilders(
+      client, createCache(duration: new Duration(minutes: 30)));
+
+  var cache = createCache(duration: new Duration(minutes: 30));
+  return (await buildBots.bindAsync((List<LuciBuildBot> buildBots) async {
+    var buildBotBuilds = new List<List<BuildDetail>>();
+    for (var buildBot in buildBots) {
+      (await api.getBuildBotDetails(client, buildBot.name, cache, amount)).fold(
+          (ex, st) {
+        logger.error("Problem getting results", ex, st);
+      }, buildBotBuilds.add);
+    }
+    logger.debug("All latest $amount builds found for client $client. "
+        "Processing results...");
+    return buildBotBuilds.expand((id) => id).toList();
+  })).bind((List<BuildDetail> buildDetails) {
+    return buildDetails.where((BuildDetail buildDetail) {
+      return buildDetail.allChanges.any((change) => change.revision == commit);
+    });
+  });
+}