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//
// Copyright 2023 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_EXT_GCP_METADATA_QUERY_H
#define GRPC_SRC_CORE_EXT_GCP_METADATA_QUERY_H
#include <grpc/support/port_platform.h>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include "y_absl/functional/any_invocable.h"
#include "y_absl/status/statusor.h"
#include "src/core/lib/gprpp/orphanable.h"
#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/http/httpcli.h"
#include "src/core/lib/http/parser.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/iomgr/polling_entity.h"
namespace grpc_core {
// Fetches the value of an attribute from the MetadataServer on a GCP
// environment.
class MetadataQuery : public InternallyRefCounted<MetadataQuery> {
public:
static constexpr const char kZoneAttribute[] =
"/computeMetadata/v1/instance/zone";
static constexpr const char kClusterNameAttribute[] =
"/computeMetadata/v1/instance/attributes/cluster-name";
static constexpr const char kRegionAttribute[] =
"/computeMetadata/v1/instance/region";
static constexpr const char kInstanceIdAttribute[] =
"/computeMetadata/v1/instance/id";
static constexpr const char kIPv6Attribute[] =
"/computeMetadata/v1/instance/network-interfaces/0/ipv6s";
MetadataQuery(
TString attribute, grpc_polling_entity* pollent,
y_absl::AnyInvocable<void(TString /* attribute */,
y_absl::StatusOr<TString> /* result */)>
callback,
Duration timeout);
// Alternative ctor allows overriding the metadata server address, mainly
// to inject fakes in tests
MetadataQuery(
TString metadata_server_name, TString attribute,
grpc_polling_entity* pollent,
y_absl::AnyInvocable<void(TString /* attribute */,
y_absl::StatusOr<TString> /* result */)>
callback,
Duration timeout);
~MetadataQuery() override;
void Orphan() override;
private:
static void OnDone(void* arg, grpc_error_handle error);
grpc_closure on_done_;
TString attribute_;
y_absl::AnyInvocable<void(TString /* attribute */,
y_absl::StatusOr<TString> /* result */)>
callback_;
OrphanablePtr<HttpRequest> http_request_;
grpc_http_response response_;
};
} // namespace grpc_core
#endif // GRPC_SRC_CORE_EXT_GCP_METADATA_QUERY_H
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