1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
|
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/fuchsia_component_support/config_reader.h"
#include <string>
#include <utility>
#include "base/check.h"
#include "base/files/file_enumerator.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/json/json_reader.h"
#include "base/logging.h"
#include "base/no_destructor.h"
namespace fuchsia_component_support {
namespace {
bool HaveConflicts(const base::Value::Dict& dict1,
const base::Value::Dict& dict2) {
for (auto item : dict1) {
const base::Value* value = dict2.Find(item.first);
if (!value)
continue;
if (!value->is_dict())
return true;
if (HaveConflicts(item.second.GetDict(), value->GetDict()))
return true;
}
return false;
}
base::Value::Dict ReadConfigFile(const base::FilePath& path) {
std::string file_content;
bool loaded = base::ReadFileToString(path, &file_content);
CHECK(loaded) << "Couldn't read config file: " << path;
auto parsed = base::JSONReader::ReadAndReturnValueWithError(file_content);
CHECK(parsed.has_value())
<< "Failed to parse " << path << ": " << parsed.error().message;
CHECK(parsed->is_dict()) << "Config is not a JSON dictionary: " << path;
return std::move(parsed->GetDict());
}
absl::optional<base::Value::Dict> ReadConfigsFromDir(
const base::FilePath& dir) {
base::FileEnumerator configs(dir, false, base::FileEnumerator::FILES,
"*.json");
absl::optional<base::Value::Dict> config;
for (base::FilePath path; !(path = configs.Next()).empty();) {
base::Value::Dict path_config = ReadConfigFile(path);
if (config) {
CHECK(!HaveConflicts(*config, path_config));
config->Merge(std::move(path_config));
} else {
config = std::move(path_config);
}
}
return config;
}
} // namespace
const absl::optional<base::Value::Dict>& LoadPackageConfig() {
// Package configurations do not change at run-time, so read the configuration
// on the first call and cache the result.
static base::NoDestructor<absl::optional<base::Value::Dict>> config(
ReadConfigsFromDir(base::FilePath("/config/data")));
return *config;
}
absl::optional<base::Value::Dict> LoadConfigFromDirForTest( // IN-TEST
const base::FilePath& dir) {
return ReadConfigsFromDir(dir);
}
} // namespace fuchsia_component_support
|