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// Licensed to the Apache Software Foundation (ASF) under one // or more contributor license agreements. See the NOTICE file // distributed with this work for additional information // regarding copyright ownership. The ASF licenses this file // to you 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. // Interfaces to use for defining Flight RPC servers. #pragma once #include #include #include #include #include #include #include "arrow/flight/server_auth.h" #include "arrow/flight/type_fwd.h" #include "arrow/flight/types.h" // IWYU pragma: keep #include "arrow/flight/visibility.h" // IWYU pragma: keep #include "arrow/ipc/dictionary.h" #include "arrow/ipc/options.h" #include "arrow/record_batch.h" namespace arrow { class Schema; class Status; namespace flight { /// \brief Interface that produces a sequence of IPC payloads to be sent in /// FlightData protobuf messages class ARROW_FLIGHT_EXPORT FlightDataStream { public: virtual ~FlightDataStream(); virtual std::shared_ptr schema() = 0; /// \brief Compute FlightPayload containing serialized RecordBatch schema virtual arrow::Result GetSchemaPayload() = 0; // When the stream is completed, the last payload written will have null // metadata virtual arrow::Result Next() = 0; virtual Status Close(); }; /// \brief A basic implementation of FlightDataStream that will provide /// a sequence of FlightData messages to be written to a stream class ARROW_FLIGHT_EXPORT RecordBatchStream : public FlightDataStream { public: /// \param[in] reader produces a sequence of record batches /// \param[in] options IPC options for writing explicit RecordBatchStream( const std::shared_ptr& reader, const ipc::IpcWriteOptions& options = ipc::IpcWriteOptions::Defaults()); ~RecordBatchStream() override; // inherit deprecated API using FlightDataStream::GetSchemaPayload; using FlightDataStream::Next; std::shared_ptr schema() override; arrow::Result GetSchemaPayload() override; arrow::Result Next() override; Status Close() override; private: class RecordBatchStreamImpl; std::unique_ptr impl_; }; /// \brief A reader for IPC payloads uploaded by a client. Also allows /// reading application-defined metadata via the Flight protocol. class ARROW_FLIGHT_EXPORT FlightMessageReader : public MetadataRecordBatchReader { public: /// \brief Get the descriptor for this upload. virtual const FlightDescriptor& descriptor() const = 0; }; /// \brief A writer for application-specific metadata sent back to the /// client during an upload. class ARROW_FLIGHT_EXPORT FlightMetadataWriter { public: virtual ~FlightMetadataWriter(); /// \brief Send a message to the client. virtual Status WriteMetadata(const Buffer& app_metadata) = 0; }; /// \brief A writer for IPC payloads to a client. Also allows sending /// application-defined metadata via the Flight protocol. /// /// This class offers more control compared to FlightDataStream, /// including the option to write metadata without data and the /// ability to interleave reading and writing. class ARROW_FLIGHT_EXPORT FlightMessageWriter : public MetadataRecordBatchWriter { public: virtual ~FlightMessageWriter() = default; }; /// \brief Call state/contextual data. class ARROW_FLIGHT_EXPORT ServerCallContext { public: virtual ~ServerCallContext() = default; /// \brief The name of the authenticated peer (may be the empty string) virtual const std::string& peer_identity() const = 0; /// \brief The peer address (not validated) virtual const std::string& peer() const = 0; /// \brief Add a response header. This is only valid before the server /// starts sending the response; generally this isn't an issue unless you /// are implementing FlightDataStream, ResultStream, or similar interfaces /// yourself, or during a DoExchange or DoPut. virtual void AddHeader(const std::string& key, const std::string& value) const = 0; /// \brief Add a response trailer. This is only valid before the server /// sends the final status; generally this isn't an issue unless your RPC /// handler launches a thread or similar. virtual void AddTrailer(const std::string& key, const std::string& value) const = 0; /// \brief Look up a middleware by key. Do not maintain a reference /// to the object beyond the request body. /// \return The middleware, or nullptr if not found. virtual ServerMiddleware* GetMiddleware(const std::string& key) const = 0; /// \brief Check if the current RPC has been cancelled (by the client, by /// a network error, etc.). virtual bool is_cancelled() const = 0; /// \brief The headers sent by the client for this call. virtual const CallHeaders& incoming_headers() const = 0; }; class ARROW_FLIGHT_EXPORT FlightServerOptions { public: explicit FlightServerOptions(const Location& location_); ~FlightServerOptions(); /// \brief The host & port (or domain socket path) to listen on. /// Use port 0 to bind to an available port. Location location; /// \brief The authentication handler to use. std::shared_ptr auth_handler; /// \brief A list of TLS certificate+key pairs to use. std::vector tls_certificates; /// \brief Enable mTLS and require that the client present a certificate. bool verify_client; /// \brief If using mTLS, the PEM-encoded root certificate to use. std::string root_certificates; /// \brief A list of server middleware to apply, along with a key to /// identify them by. /// /// Middleware are always applied in the order provided. Duplicate /// keys are an error. std::vector>> middleware; /// \brief An optional memory manager to control where to allocate incoming data. std::shared_ptr memory_manager; /// \brief A Flight implementation-specific callback to customize /// transport-specific options. /// /// Not guaranteed to be called. The type of the parameter is /// specific to the Flight implementation. Users should take care to /// link to the same transport implementation as Flight to avoid /// runtime problems. See "Using Arrow C++ in your own project" in /// the documentation for more details. std::function builder_hook; }; /// \brief Skeleton RPC server implementation which can be used to create /// custom servers by implementing its abstract methods class ARROW_FLIGHT_EXPORT FlightServerBase { public: FlightServerBase(); virtual ~FlightServerBase(); // Lifecycle methods. /// \brief Initialize a Flight server listening at the given location. /// This method must be called before any other method. /// \param[in] options The configuration for this server. Status Init(const FlightServerOptions& options); /// \brief Get the port that the Flight server is listening on. /// This method must only be called after Init(). Will return a /// non-positive value if no port exists (e.g. when listening on a /// domain socket). int port() const; /// \brief Get the address that the Flight server is listening on. /// This method must only be called after Init(). Location location() const; /// \brief Set the server to stop when receiving any of the given signal /// numbers. /// This method must be called before Serve(). Status SetShutdownOnSignals(const std::vector sigs); /// \brief Start serving. /// This method blocks until the server shuts down. /// /// The server will start to shut down when either Shutdown() is called /// or one of the signals registered in SetShutdownOnSignals() is received. Status Serve(); /// \brief Query whether Serve() was interrupted by a signal. /// This method must be called after Serve() has returned. /// /// \return int the signal number that interrupted Serve(), if any, otherwise 0 int GotSignal() const; /// \brief Shut down the server, blocking until current requests finish. /// /// Can be called from a signal handler or another thread while Serve() /// blocks. Optionally a deadline can be set. Once the deadline expires /// server will wait until remaining running calls complete. /// /// Should only be called once. Status Shutdown(const std::chrono::system_clock::time_point* deadline = NULLPTR); /// \brief Block until server shuts down with Shutdown. /// /// Does not respond to signals like Serve(). Status Wait(); // Implement these methods to create your own server. The default // implementations will return a not-implemented result to the client /// \brief Retrieve a list of available fields given an optional opaque /// criteria /// \param[in] context The call context. /// \param[in] criteria may be null /// \param[out] listings the returned listings iterator /// \return Status virtual Status ListFlights(const ServerCallContext& context, const Criteria* criteria, std::unique_ptr* listings); /// \brief Retrieve the schema and an access plan for the indicated /// descriptor /// \param[in] context The call context. /// \param[in] request the dataset request, whether a named dataset or command /// \param[out] info the returned flight info provider /// \return Status virtual Status GetFlightInfo(const ServerCallContext& context, const FlightDescriptor& request, std::unique_ptr* info); /// \brief Retrieve the current status of the target query /// \param[in] context The call context. /// \param[in] request the dataset request or a descriptor returned by a /// prior PollFlightInfo call /// \param[out] info the returned retry info provider /// \return Status virtual Status PollFlightInfo(const ServerCallContext& context, const FlightDescriptor& request, std::unique_ptr* info); /// \brief Retrieve the schema for the indicated descriptor /// \param[in] context The call context. /// \param[in] request the dataset request, whether a named dataset or command /// \param[out] schema the returned flight schema provider /// \return Status virtual Status GetSchema(const ServerCallContext& context, const FlightDescriptor& request, std::unique_ptr* schema); /// \brief Get a stream of IPC payloads to put on the wire /// \param[in] context The call context. /// \param[in] request an opaque ticket /// \param[out] stream the returned stream provider /// \return Status virtual Status DoGet(const ServerCallContext& context, const Ticket& request, std::unique_ptr* stream); /// \brief Process a stream of IPC payloads sent from a client /// \param[in] context The call context. /// \param[in] reader a sequence of uploaded record batches /// \param[in] writer send metadata back to the client /// \return Status virtual Status DoPut(const ServerCallContext& context, std::unique_ptr reader, std::unique_ptr writer); /// \brief Process a bidirectional stream of IPC payloads /// \param[in] context The call context. /// \param[in] reader a sequence of uploaded record batches /// \param[in] writer send data back to the client /// \return Status virtual Status DoExchange(const ServerCallContext& context, std::unique_ptr reader, std::unique_ptr writer); /// \brief Execute an action, return stream of zero or more results /// \param[in] context The call context. /// \param[in] action the action to execute, with type and body /// \param[out] result the result iterator /// \return Status virtual Status DoAction(const ServerCallContext& context, const Action& action, std::unique_ptr* result); /// \brief Retrieve the list of available actions /// \param[in] context The call context. /// \param[out] actions a vector of available action types /// \return Status virtual Status ListActions(const ServerCallContext& context, std::vector* actions); private: struct Impl; std::unique_ptr impl_; }; } // namespace flight } // namespace arrow