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//
//
// Copyright 2020 gRPC authors.
//
// 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.
//
//
#ifndef GRPC_SRC_CORE_LIB_JSON_JSON_UTIL_H
#define GRPC_SRC_CORE_LIB_JSON_JSON_UTIL_H
#include <grpc/support/port_platform.h>
#include <algorithm>
#include <map>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include <type_traits>
#include <utility>
#include <vector>
#include "y_absl/strings/numbers.h"
#include "y_absl/strings/str_cat.h"
#include "y_absl/strings/string_view.h"
#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/json/json.h"
namespace grpc_core {
// Parses a JSON field of the form generated for a google.proto.Duration
// proto message, as per:
// https://developers.google.com/protocol-buffers/docs/proto3#json
// Returns true on success, false otherwise.
bool ParseDurationFromJson(const Json& field, Duration* duration);
//
// Helper functions for extracting types from JSON.
// Return true on success, false otherwise. If an error is encountered during
// parsing, a descriptive error is appended to \a error_list.
//
template <typename NumericType>
bool ExtractJsonNumber(const Json& json, y_absl::string_view field_name,
NumericType* output,
std::vector<grpc_error_handle>* error_list) {
static_assert(std::is_integral<NumericType>::value, "Integral required");
if (json.type() != Json::Type::NUMBER && json.type() != Json::Type::STRING) {
error_list->push_back(GRPC_ERROR_CREATE(y_absl::StrCat(
"field:", field_name, " error:type should be NUMBER or STRING")));
return false;
}
if (!y_absl::SimpleAtoi(json.string_value(), output)) {
error_list->push_back(GRPC_ERROR_CREATE(
y_absl::StrCat("field:", field_name, " error:failed to parse.")));
return false;
}
return true;
}
bool ExtractJsonBool(const Json& json, y_absl::string_view field_name,
bool* output, std::vector<grpc_error_handle>* error_list);
// OutputType can be TString or y_absl::string_view.
template <typename OutputType>
bool ExtractJsonString(const Json& json, y_absl::string_view field_name,
OutputType* output,
std::vector<grpc_error_handle>* error_list) {
if (json.type() != Json::Type::STRING) {
*output = "";
error_list->push_back(GRPC_ERROR_CREATE(
y_absl::StrCat("field:", field_name, " error:type should be STRING")));
return false;
}
*output = json.string_value();
return true;
}
bool ExtractJsonArray(const Json& json, y_absl::string_view field_name,
const Json::Array** output,
std::vector<grpc_error_handle>* error_list);
bool ExtractJsonObject(const Json& json, y_absl::string_view field_name,
const Json::Object** output,
std::vector<grpc_error_handle>* error_list);
// Wrappers for automatically choosing one of the above functions based
// on output parameter type.
template <typename NumericType>
inline bool ExtractJsonType(const Json& json, y_absl::string_view field_name,
NumericType* output,
std::vector<grpc_error_handle>* error_list) {
return ExtractJsonNumber(json, field_name, output, error_list);
}
inline bool ExtractJsonType(const Json& json, y_absl::string_view field_name,
bool* output,
std::vector<grpc_error_handle>* error_list) {
return ExtractJsonBool(json, field_name, output, error_list);
}
inline bool ExtractJsonType(const Json& json, y_absl::string_view field_name,
TString* output,
std::vector<grpc_error_handle>* error_list) {
return ExtractJsonString(json, field_name, output, error_list);
}
inline bool ExtractJsonType(const Json& json, y_absl::string_view field_name,
y_absl::string_view* output,
std::vector<grpc_error_handle>* error_list) {
return ExtractJsonString(json, field_name, output, error_list);
}
inline bool ExtractJsonType(const Json& json, y_absl::string_view field_name,
const Json::Array** output,
std::vector<grpc_error_handle>* error_list) {
return ExtractJsonArray(json, field_name, output, error_list);
}
inline bool ExtractJsonType(const Json& json, y_absl::string_view field_name,
const Json::Object** output,
std::vector<grpc_error_handle>* error_list) {
return ExtractJsonObject(json, field_name, output, error_list);
}
// Extracts a field from a JSON object, automatically selecting the type
// of parsing based on the output parameter type.
// If the field is not present, returns false, and if required is true,
// adds an error to error_list.
// Upon any other error, adds an error to error_list and returns false.
template <typename T>
bool ParseJsonObjectField(const Json::Object& object,
y_absl::string_view field_name, T* output,
std::vector<grpc_error_handle>* error_list,
bool required = true) {
// TODO(roth): Once we can use C++14 heterogenous lookups, stop
// creating a TString here.
auto it = object.find(TString(field_name));
if (it == object.end()) {
if (required) {
error_list->push_back(GRPC_ERROR_CREATE(
y_absl::StrCat("field:", field_name, " error:does not exist.")));
}
return false;
}
auto& child_object_json = it->second;
return ExtractJsonType(child_object_json, field_name, output, error_list);
}
// Alternative to ParseJsonObjectField() for duration-value fields.
bool ParseJsonObjectFieldAsDuration(const Json::Object& object,
y_absl::string_view field_name,
Duration* output,
std::vector<grpc_error_handle>* error_list,
bool required = true);
} // namespace grpc_core
#endif // GRPC_SRC_CORE_LIB_JSON_JSON_UTIL_H
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