[Chromecast] Consolidate duplicated crash test functions.

chromecast/crash/linux/crash_testing_utils.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chromecast/crash/linux/crash_testing_utils.h"
+
+#include "base/files/file_util.h"
+#include "base/values.h"
+#include "chromecast/base/serializers.h"
+#include "chromecast/crash/linux/dump_info.h"
+
+namespace chromecast {
+namespace {
+
+const char kDumpsKey[] = "dumps";
+
+// Gets the list of deserialized DumpInfo given a deserialized |lockfile|.
+base::ListValue* GetDumpList(base::Value* lockfile) {
+  base::DictionaryValue* dict;
+  base::ListValue* dump_list;
+  if (!lockfile || !lockfile->GetAsDictionary(&dict) ||
+      !dict->GetList(kDumpsKey, &dump_list)) {
+    return nullptr;
+  }
+
+  return dump_list;
+}
+
+}  // namespcae
+
+scoped_ptr<DumpInfo> CreateDumpInfo(const std::string& json_string) {
+  scoped_ptr<base::Value> value(DeserializeFromJson(json_string));
+  return make_scoped_ptr(new DumpInfo(value.get()));
+}
+
+bool FetchDumps(const std::string& lockfile_path,
+                ScopedVector<DumpInfo>* dumps) {
+  if (!dumps) {
+    return false;
+  }
+  dumps->clear();
+
+  base::FilePath path(lockfile_path);
+  scoped_ptr<base::Value> contents(DeserializeJsonFromFile(path));
+  base::ListValue* dump_list = GetDumpList(contents.get());
+  if (!dump_list) {
+    return false;
+  }
+
+  for (base::Value* elem : *dump_list) {
+    scoped_ptr<DumpInfo> dump = make_scoped_ptr(new DumpInfo(elem));
+    if (!dump->valid()) {
+      return false;
+    }
+    dumps->push_back(dump.Pass());
+  }
+
+  return true;
+}
+
+bool CreateLockFile(const std::string& lockfile_path) {
+  scoped_ptr<base::DictionaryValue> output =
+      make_scoped_ptr(new base::DictionaryValue());
+  output->Set(kDumpsKey, make_scoped_ptr(new base::ListValue()));
+
+  base::FilePath path(lockfile_path);
+
+  const base::Value* val = output.get();
+  return SerializeJsonToFile(path, *val);
+}
+
+bool AppendLockFile(const std::string& lockfile_path, const DumpInfo& dump) {
+  base::FilePath path(lockfile_path);
+
+  scoped_ptr<base::Value> contents(DeserializeJsonFromFile(path));
+  if (!contents) {
+    CreateLockFile(lockfile_path);
+    if (!(contents = DeserializeJsonFromFile(path))) {
+      return false;
+    }
+  }
+
+  base::ListValue* dump_list = GetDumpList(contents.get());
+  if (!dump_list) {
+    return false;
+  }
+
+  dump_list->Append(dump.GetAsValue());
+
+  return SerializeJsonToFile(path, *contents);
+}
+
+}  // namespace chromecast