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//
// Copyright 2015 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.
//
#include <grpc/support/port_platform.h>
#include "src/core/lib/transport/service_config.h"
#include <string.h>
#include <grpc/impl/codegen/grpc_types.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/json/json.h"
#include "src/core/lib/slice/slice_hash_table.h"
#include "src/core/lib/slice/slice_internal.h"
#include "src/core/lib/slice/slice_string_helpers.h"
namespace grpc_core {
UniquePtr<ServiceConfig> ServiceConfig::Create(const char* json) {
UniquePtr<char> json_string(gpr_strdup(json));
grpc_json* json_tree = grpc_json_parse_string(json_string.get());
if (json_tree == nullptr) {
gpr_log(GPR_INFO, "failed to parse JSON for service config");
return nullptr;
}
return MakeUnique<ServiceConfig>(std::move(json_string), json_tree);
}
ServiceConfig::ServiceConfig(UniquePtr<char> json_string, grpc_json* json_tree)
: json_string_(std::move(json_string)), json_tree_(json_tree) {}
ServiceConfig::~ServiceConfig() { grpc_json_destroy(json_tree_); }
const char* ServiceConfig::GetLoadBalancingPolicyName() const {
if (json_tree_->type != GRPC_JSON_OBJECT || json_tree_->key != nullptr) {
return nullptr;
}
const char* lb_policy_name = nullptr;
for (grpc_json* field = json_tree_->child; field != nullptr;
field = field->next) {
if (field->key == nullptr) return nullptr;
if (strcmp(field->key, "loadBalancingPolicy") == 0) {
if (lb_policy_name != nullptr) return nullptr; // Duplicate.
if (field->type != GRPC_JSON_STRING) return nullptr;
lb_policy_name = field->value;
}
}
return lb_policy_name;
}
size_t ServiceConfig::CountNamesInMethodConfig(grpc_json* json) {
size_t num_names = 0;
for (grpc_json* field = json->child; field != nullptr; field = field->next) {
if (field->key != nullptr && strcmp(field->key, "name") == 0) {
if (field->type != GRPC_JSON_ARRAY) return -1;
for (grpc_json* name = field->child; name != nullptr; name = name->next) {
if (name->type != GRPC_JSON_OBJECT) return -1;
++num_names;
}
}
}
return num_names;
}
UniquePtr<char> ServiceConfig::ParseJsonMethodName(grpc_json* json) {
if (json->type != GRPC_JSON_OBJECT) return nullptr;
const char* service_name = nullptr;
const char* method_name = nullptr;
for (grpc_json* child = json->child; child != nullptr; child = child->next) {
if (child->key == nullptr) return nullptr;
if (child->type != GRPC_JSON_STRING) return nullptr;
if (strcmp(child->key, "service") == 0) {
if (service_name != nullptr) return nullptr; // Duplicate.
if (child->value == nullptr) return nullptr;
service_name = child->value;
} else if (strcmp(child->key, "method") == 0) {
if (method_name != nullptr) return nullptr; // Duplicate.
if (child->value == nullptr) return nullptr;
method_name = child->value;
}
}
if (service_name == nullptr) return nullptr; // Required field.
char* path;
gpr_asprintf(&path, "/%s/%s", service_name,
method_name == nullptr ? "*" : method_name);
return UniquePtr<char>(path);
}
} // namespace grpc_core
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