mirror of
https://github.com/alibaba/higress.git
synced 2026-02-06 23:21:08 +08:00
121 lines
3.4 KiB
C++
121 lines
3.4 KiB
C++
/* Copyright 2020 Istio Authors. All Rights Reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "common/nlohmann_json.hpp"
|
|
|
|
/**
|
|
* Utilities for working with JSON without exceptions.
|
|
*/
|
|
namespace Wasm {
|
|
namespace Common {
|
|
|
|
using JsonObject = ::nlohmann::json;
|
|
|
|
enum JsonParserResultDetail {
|
|
UNKNOWN,
|
|
OK,
|
|
OUT_OF_RANGE,
|
|
TYPE_ERROR,
|
|
INVALID_VALUE,
|
|
};
|
|
|
|
std::optional<JsonObject> JsonParse(std::string_view str);
|
|
|
|
template <typename T>
|
|
std::pair<std::optional<T>, JsonParserResultDetail> JsonValueAs(
|
|
const JsonObject&) {
|
|
static_assert(true, "Unsupported Type");
|
|
}
|
|
|
|
template <>
|
|
std::pair<std::optional<std::string_view>, JsonParserResultDetail>
|
|
JsonValueAs<std::string_view>(const JsonObject& j);
|
|
|
|
template <>
|
|
std::pair<std::optional<std::string>, JsonParserResultDetail>
|
|
JsonValueAs<std::string>(const JsonObject& j);
|
|
|
|
template <>
|
|
std::pair<std::optional<int64_t>, JsonParserResultDetail> JsonValueAs<int64_t>(
|
|
const JsonObject& j);
|
|
|
|
template <>
|
|
std::pair<std::optional<uint64_t>, JsonParserResultDetail>
|
|
JsonValueAs<uint64_t>(const JsonObject& j);
|
|
|
|
template <>
|
|
std::pair<std::optional<bool>, JsonParserResultDetail> JsonValueAs<bool>(
|
|
const JsonObject& j);
|
|
|
|
template <>
|
|
std::pair<std::optional<JsonObject>, JsonParserResultDetail>
|
|
JsonValueAs<JsonObject>(const JsonObject& j);
|
|
|
|
template <>
|
|
std::pair<std::optional<std::vector<std::string_view>>, JsonParserResultDetail>
|
|
JsonValueAs<std::vector<std::string_view>>(const JsonObject& j);
|
|
|
|
template <class T>
|
|
class JsonGetField {
|
|
public:
|
|
JsonGetField(const JsonObject& j, std::string_view field);
|
|
const JsonParserResultDetail& detail() { return detail_; }
|
|
T value() { return object_; }
|
|
T value_or(T v) {
|
|
if (detail_ != JsonParserResultDetail::OK)
|
|
return v;
|
|
else
|
|
return object_;
|
|
};
|
|
|
|
private:
|
|
JsonParserResultDetail detail_;
|
|
T object_;
|
|
};
|
|
|
|
template <class T>
|
|
JsonGetField<T>::JsonGetField(const JsonObject& j, std::string_view field) {
|
|
auto it = j.find(field);
|
|
if (it == j.end()) {
|
|
detail_ = JsonParserResultDetail::OUT_OF_RANGE;
|
|
return;
|
|
}
|
|
auto value = JsonValueAs<T>(it.value());
|
|
detail_ = value.second;
|
|
if (value.first.has_value()) {
|
|
object_ = value.first.value();
|
|
}
|
|
}
|
|
|
|
// Iterate over an optional array field.
|
|
// Returns false if set and not an array, or any of the visitor calls returns
|
|
// false.
|
|
bool JsonArrayIterate(
|
|
const JsonObject& j, std::string_view field,
|
|
const std::function<bool(const JsonObject& elt)>& visitor);
|
|
|
|
// Iterate over an optional object field key set.
|
|
// Returns false if set and not an object, or any of the visitor calls returns
|
|
// false.
|
|
bool JsonObjectIterate(const JsonObject& j, std::string_view field,
|
|
const std::function<bool(std::string key)>& visitor);
|
|
bool JsonObjectIterate(const JsonObject& j,
|
|
const std::function<bool(std::string key)>& visitor);
|
|
|
|
} // namespace Common
|
|
} // namespace Wasm
|