buffet: Moved LoadJsonDict() function into buffet/utils.h
Moved LoadJsonDict from CommandManager class into a separate
header file as a stand-alone function so that it can be
used by itself.
This function will come in handy when implementing device
state management.
BUG=chromium:415364
TEST=FEATURES=test emerge-link buffet
Change-Id: Ie818a811989d82e4b092e399ca136e15276ab453
Reviewed-on: https://chromium-review.googlesource.com/219134
Tested-by: Alex Vakulenko <avakulenko@chromium.org>
Reviewed-by: Christopher Wiley <wiley@chromium.org>
Commit-Queue: Alex Vakulenko <avakulenko@chromium.org>
diff --git a/buffet/utils.cc b/buffet/utils.cc
new file mode 100644
index 0000000..71e9a56
--- /dev/null
+++ b/buffet/utils.cc
@@ -0,0 +1,55 @@
+// Copyright 2014 The Chromium OS 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 "buffet/utils.h"
+
+#include <map>
+#include <string>
+
+#include <base/files/file_util.h>
+#include <base/json/json_reader.h>
+#include <chromeos/errors/error_codes.h>
+
+namespace buffet {
+
+const char kErrorDomainBuffet[] = "buffet";
+const char kFileReadError[] = "file_read_error";
+
+std::unique_ptr<const base::DictionaryValue> LoadJsonDict(
+ const base::FilePath& json_file_path, chromeos::ErrorPtr* error) {
+ std::unique_ptr<const base::DictionaryValue> result;
+ std::string json_string;
+ if (!base::ReadFileToString(json_file_path, &json_string)) {
+ chromeos::errors::system::AddSystemError(error, errno);
+ chromeos::Error::AddToPrintf(error, kErrorDomainBuffet,
+ kFileReadError,
+ "Failed to read file '%s'",
+ json_file_path.value().c_str());
+ return result;
+ }
+ std::string error_message;
+ base::Value* value = base::JSONReader::ReadAndReturnError(
+ json_string, base::JSON_PARSE_RFC, nullptr, &error_message);
+ if (!value) {
+ chromeos::Error::AddToPrintf(error, chromeos::errors::json::kDomain,
+ chromeos::errors::json::kParseError,
+ "Error parsing content of JSON file '%s': %s",
+ json_file_path.value().c_str(),
+ error_message.c_str());
+ return result;
+ }
+ const base::DictionaryValue* dict_value = nullptr;
+ if (!value->GetAsDictionary(&dict_value)) {
+ delete value;
+ chromeos::Error::AddToPrintf(error, chromeos::errors::json::kDomain,
+ chromeos::errors::json::kObjectExpected,
+ "Content of file '%s' is not a JSON object",
+ json_file_path.value().c_str());
+ return result;
+ }
+ result.reset(dict_value);
+ return result;
+}
+
+} // namespace buffet
