| // |
| // 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 <string> |
| |
| #include "absl/functional/any_invocable.h" |
| #include "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( |
| std::string attribute, grpc_polling_entity* pollent, |
| absl::AnyInvocable<void(std::string /* attribute */, |
| absl::StatusOr<std::string> /* result */)> |
| callback, |
| Duration timeout); |
| |
| // Alternative ctor allows overriding the metadata server address, mainly |
| // to inject fakes in tests |
| MetadataQuery( |
| std::string metadata_server_name, std::string attribute, |
| grpc_polling_entity* pollent, |
| absl::AnyInvocable<void(std::string /* attribute */, |
| absl::StatusOr<std::string> /* result */)> |
| callback, |
| Duration timeout); |
| |
| ~MetadataQuery() override; |
| |
| void Orphan() override; |
| |
| private: |
| static void OnDone(void* arg, grpc_error_handle error); |
| |
| grpc_closure on_done_; |
| std::string attribute_; |
| absl::AnyInvocable<void(std::string /* attribute */, |
| absl::StatusOr<std::string> /* result */)> |
| callback_; |
| OrphanablePtr<HttpRequest> http_request_; |
| grpc_http_response response_; |
| }; |
| |
| } // namespace grpc_core |
| |
| #endif // GRPC_SRC_CORE_EXT_GCP_METADATA_QUERY_H |