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//
// Copyright 2016 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_CORE_EXT_FILTERS_CLIENT_CHANNEL_SERVICE_CONFIG_H
#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_SERVICE_CONFIG_H
#include <grpc/support/port_platform.h>
#include <unordered_map>
#include "absl/container/inlined_vector.h"
#include <grpc/impl/codegen/grpc_types.h>
#include <grpc/support/string_util.h>
#include "src/core/ext/filters/client_channel/service_config_parser.h"
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/json/json.h"
#include "src/core/lib/slice/slice_internal.h"
// The main purpose of the code here is to parse the service config in
// JSON form, which will look like this:
//
// {
// "loadBalancingPolicy": "string", // optional
// "methodConfig": [ // array of one or more method_config objects
// {
// "name": [ // array of one or more name objects
// {
// "service": "string", // required
// "method": "string", // optional
// }
// ],
// // remaining fields are optional.
// // see https://developers.google.com/protocol-buffers/docs/proto3#json
// // for format details.
// "waitForReady": bool,
// "timeout": "duration_string",
// "maxRequestMessageBytes": "int64_string",
// "maxResponseMessageBytes": "int64_string",
// }
// ]
// }
namespace grpc_core {
// TODO(roth): Consider stripping this down further to the completely minimal
// interface requied to be exposed as part of the resolver API.
class ServiceConfig : public RefCounted<ServiceConfig> {
public:
/// Creates a new service config from parsing \a json_string.
/// Returns null on parse error.
static RefCountedPtr<ServiceConfig> Create(const grpc_channel_args* args,
absl::string_view json_string,
grpc_error** error);
ServiceConfig(const grpc_channel_args* args, std::string json_string,
Json json, grpc_error** error);
~ServiceConfig() override;
const std::string& json_string() const { return json_string_; }
/// Retrieves the global parsed config at index \a index. The
/// lifetime of the returned object is tied to the lifetime of the
/// ServiceConfig object.
ServiceConfigParser::ParsedConfig* GetGlobalParsedConfig(size_t index) {
GPR_DEBUG_ASSERT(index < parsed_global_configs_.size());
return parsed_global_configs_[index].get();
}
/// Retrieves the vector of parsed configs for the method identified
/// by \a path. The lifetime of the returned vector and contained objects
/// is tied to the lifetime of the ServiceConfig object.
const ServiceConfigParser::ParsedConfigVector* GetMethodParsedConfigVector(
const grpc_slice& path) const;
private:
// Helper functions for parsing the method configs.
grpc_error* ParsePerMethodParams(const grpc_channel_args* args);
grpc_error* ParseJsonMethodConfig(const grpc_channel_args* args,
const Json& json);
// Returns a path string for the JSON name object specified by json.
// Sets *error on error.
static std::string ParseJsonMethodName(const Json& json, grpc_error** error);
std::string json_string_;
Json json_;
absl::InlinedVector<std::unique_ptr<ServiceConfigParser::ParsedConfig>,
ServiceConfigParser::kNumPreallocatedParsers>
parsed_global_configs_;
// A map from the method name to the parsed config vector. Note that we are
// using a raw pointer and not a unique pointer so that we can use the same
// vector for multiple names.
std::unordered_map<grpc_slice, const ServiceConfigParser::ParsedConfigVector*,
SliceHash>
parsed_method_configs_map_;
// Default method config.
const ServiceConfigParser::ParsedConfigVector* default_method_config_vector_ =
nullptr;
// Storage for all the vectors that are being used in
// parsed_method_configs_table_.
absl::InlinedVector<std::unique_ptr<ServiceConfigParser::ParsedConfigVector>,
32>
parsed_method_config_vectors_storage_;
};
} // namespace grpc_core
#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_SERVICE_CONFIG_H */
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