mirror of https://github.com/grpc/grpc.git
Merge pull request #19236 from mhaidrygoog/move_server_context
Move server context implementation to grpc_impl namespace and typedef…pull/19324/head
Moiz Haidry
6 years ago
committed by
GitHub
commit
465eb2f8d0
26 changed files with 489 additions and 430 deletions
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/*
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* |
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* Copyright 2019 gRPC authors. |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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*/ |
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#ifndef GRPCPP_IMPL_CODEGEN_SERVER_CONTEXT_IMPL_H |
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#define GRPCPP_IMPL_CODEGEN_SERVER_CONTEXT_IMPL_H |
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#include <map> |
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#include <memory> |
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#include <vector> |
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#include <grpc/impl/codegen/compression_types.h> |
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#include <grpcpp/impl/codegen/call.h> |
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#include <grpcpp/impl/codegen/call_op_set.h> |
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#include <grpcpp/impl/codegen/callback_common.h> |
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#include <grpcpp/impl/codegen/completion_queue_tag.h> |
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#include <grpcpp/impl/codegen/config.h> |
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#include <grpcpp/impl/codegen/create_auth_context.h> |
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#include <grpcpp/impl/codegen/metadata_map.h> |
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#include <grpcpp/impl/codegen/security/auth_context.h> |
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#include <grpcpp/impl/codegen/server_interceptor.h> |
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#include <grpcpp/impl/codegen/string_ref.h> |
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#include <grpcpp/impl/codegen/time.h> |
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struct grpc_metadata; |
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struct grpc_call; |
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struct census_context; |
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namespace grpc_impl { |
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class ClientContext; |
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class CompletionQueue; |
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class Server; |
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} // namespace grpc_impl
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namespace grpc { |
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class GenericServerContext; |
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class ServerInterface; |
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template <class W, class R> |
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class ServerAsyncReader; |
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template <class W> |
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class ServerAsyncWriter; |
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template <class W> |
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class ServerAsyncResponseWriter; |
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template <class W, class R> |
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class ServerAsyncReaderWriter; |
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template <class R> |
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class ServerReader; |
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template <class W> |
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class ServerWriter; |
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namespace internal { |
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template <class W, class R> |
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class ServerReaderWriterBody; |
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template <class ServiceType, class RequestType, class ResponseType> |
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class RpcMethodHandler; |
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template <class ServiceType, class RequestType, class ResponseType> |
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class ClientStreamingHandler; |
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template <class ServiceType, class RequestType, class ResponseType> |
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class ServerStreamingHandler; |
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template <class ServiceType, class RequestType, class ResponseType> |
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class BidiStreamingHandler; |
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template <class RequestType, class ResponseType> |
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class CallbackUnaryHandler; |
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template <class RequestType, class ResponseType> |
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class CallbackClientStreamingHandler; |
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template <class RequestType, class ResponseType> |
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class CallbackServerStreamingHandler; |
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template <class RequestType, class ResponseType> |
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class CallbackBidiHandler; |
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template <class Streamer, bool WriteNeeded> |
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class TemplatedBidiStreamingHandler; |
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template <StatusCode code> |
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class ErrorMethodHandler; |
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class Call; |
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class ServerReactor; |
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} // namespace internal
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class ServerInterface; |
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namespace testing { |
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class InteropServerContextInspector; |
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class ServerContextTestSpouse; |
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} // namespace testing
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} // namespace grpc
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namespace grpc_impl { |
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/// A ServerContext allows the person implementing a service handler to:
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///
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/// - Add custom initial and trailing metadata key-value pairs that will
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/// propagated to the client side.
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/// - Control call settings such as compression and authentication.
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/// - Access metadata coming from the client.
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/// - Get performance metrics (ie, census).
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///
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/// Context settings are only relevant to the call handler they are supplied to,
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/// that is to say, they aren't sticky across multiple calls. Some of these
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/// settings, such as the compression options, can be made persistent at server
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/// construction time by specifying the appropriate \a ChannelArguments
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/// to a \a grpc::ServerBuilder, via \a ServerBuilder::AddChannelArgument.
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///
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/// \warning ServerContext instances should \em not be reused across rpcs.
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class ServerContext { |
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public: |
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ServerContext(); // for async calls
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~ServerContext(); |
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/// Return the deadline for the server call.
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std::chrono::system_clock::time_point deadline() const { |
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return ::grpc::Timespec2Timepoint(deadline_); |
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} |
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/// Return a \a gpr_timespec representation of the server call's deadline.
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gpr_timespec raw_deadline() const { return deadline_; } |
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/// Add the (\a key, \a value) pair to the initial metadata
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/// associated with a server call. These are made available at the client side
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/// by the \a grpc::ClientContext::GetServerInitialMetadata() method.
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///
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/// \warning This method should only be called before sending initial metadata
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/// to the client (which can happen explicitly, or implicitly when sending a
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/// a response message or status to the client).
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///
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/// \param key The metadata key. If \a value is binary data, it must
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/// end in "-bin".
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/// \param value The metadata value. If its value is binary, the key name
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/// must end in "-bin".
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///
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/// Metadata must conform to the following format:
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/// Custom-Metadata -> Binary-Header / ASCII-Header
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/// Binary-Header -> {Header-Name "-bin" } {binary value}
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/// ASCII-Header -> Header-Name ASCII-Value
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/// Header-Name -> 1*( %x30-39 / %x61-7A / "_" / "-" / ".") ; 0-9 a-z _ - .
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/// ASCII-Value -> 1*( %x20-%x7E ) ; space and printable ASCII
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void AddInitialMetadata(const grpc::string& key, const grpc::string& value); |
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/// Add the (\a key, \a value) pair to the initial metadata
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/// associated with a server call. These are made available at the client
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/// side by the \a grpc::ClientContext::GetServerTrailingMetadata() method.
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///
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/// \warning This method should only be called before sending trailing
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/// metadata to the client (which happens when the call is finished and a
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/// status is sent to the client).
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///
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/// \param key The metadata key. If \a value is binary data,
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/// it must end in "-bin".
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/// \param value The metadata value. If its value is binary, the key name
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/// must end in "-bin".
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///
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/// Metadata must conform to the following format:
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/// Custom-Metadata -> Binary-Header / ASCII-Header
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/// Binary-Header -> {Header-Name "-bin" } {binary value}
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/// ASCII-Header -> Header-Name ASCII-Value
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/// Header-Name -> 1*( %x30-39 / %x61-7A / "_" / "-" / ".") ; 0-9 a-z _ - .
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/// ASCII-Value -> 1*( %x20-%x7E ) ; space and printable ASCII
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void AddTrailingMetadata(const grpc::string& key, const grpc::string& value); |
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/// IsCancelled is always safe to call when using sync or callback API.
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/// When using async API, it is only safe to call IsCancelled after
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/// the AsyncNotifyWhenDone tag has been delivered.
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bool IsCancelled() const; |
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/// Cancel the Call from the server. This is a best-effort API and
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/// depending on when it is called, the RPC may still appear successful to
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/// the client.
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/// For example, if TryCancel() is called on a separate thread, it might race
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/// with the server handler which might return success to the client before
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/// TryCancel() was even started by the thread.
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///
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/// It is the caller's responsibility to prevent such races and ensure that if
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/// TryCancel() is called, the serverhandler must return Status::CANCELLED.
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/// The only exception is that if the serverhandler is already returning an
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/// error status code, it is ok to not return Status::CANCELLED even if
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/// TryCancel() was called.
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///
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/// Note that TryCancel() does not change any of the tags that are pending
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/// on the completion queue. All pending tags will still be delivered
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/// (though their ok result may reflect the effect of cancellation).
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void TryCancel() const; |
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/// Return a collection of initial metadata key-value pairs sent from the
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/// client. Note that keys may happen more than
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/// once (ie, a \a std::multimap is returned).
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///
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/// It is safe to use this method after initial metadata has been received,
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/// Calls always begin with the client sending initial metadata, so this is
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/// safe to access as soon as the call has begun on the server side.
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///
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/// \return A multimap of initial metadata key-value pairs from the server.
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const std::multimap<grpc::string_ref, grpc::string_ref>& client_metadata() |
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const { |
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return *client_metadata_.map(); |
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} |
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/// Return the compression algorithm to be used by the server call.
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grpc_compression_level compression_level() const { |
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return compression_level_; |
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} |
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/// Set \a level to be the compression level used for the server call.
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///
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/// \param level The compression level used for the server call.
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void set_compression_level(grpc_compression_level level) { |
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compression_level_set_ = true; |
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compression_level_ = level; |
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} |
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/// Return a bool indicating whether the compression level for this call
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/// has been set (either implicitly or through a previous call to
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/// \a set_compression_level.
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bool compression_level_set() const { return compression_level_set_; } |
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/// Return the compression algorithm the server call will request be used.
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/// Note that the gRPC runtime may decide to ignore this request, for example,
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/// due to resource constraints, or if the server is aware the client doesn't
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/// support the requested algorithm.
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grpc_compression_algorithm compression_algorithm() const { |
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return compression_algorithm_; |
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} |
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/// Set \a algorithm to be the compression algorithm used for the server call.
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///
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/// \param algorithm The compression algorithm used for the server call.
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void set_compression_algorithm(grpc_compression_algorithm algorithm); |
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/// Set the serialized load reporting costs in \a cost_data for the call.
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void SetLoadReportingCosts(const std::vector<grpc::string>& cost_data); |
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/// Return the authentication context for this server call.
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///
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/// \see grpc::AuthContext.
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std::shared_ptr<const ::grpc::AuthContext> auth_context() const { |
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if (auth_context_.get() == nullptr) { |
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auth_context_ = ::grpc::CreateAuthContext(call_); |
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} |
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return auth_context_; |
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} |
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/// Return the peer uri in a string.
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/// WARNING: this value is never authenticated or subject to any security
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/// related code. It must not be used for any authentication related
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/// functionality. Instead, use auth_context.
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grpc::string peer() const; |
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/// Get the census context associated with this server call.
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const struct census_context* census_context() const; |
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/// Async only. Has to be called before the rpc starts.
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/// Returns the tag in completion queue when the rpc finishes.
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/// IsCancelled() can then be called to check whether the rpc was cancelled.
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/// TODO(vjpai): Fix this so that the tag is returned even if the call never
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/// starts (https://github.com/grpc/grpc/issues/10136).
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void AsyncNotifyWhenDone(void* tag) { |
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has_notify_when_done_tag_ = true; |
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async_notify_when_done_tag_ = tag; |
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} |
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/// Should be used for framework-level extensions only.
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/// Applications never need to call this method.
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grpc_call* c_call() { return call_; } |
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private: |
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friend class ::grpc::testing::InteropServerContextInspector; |
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friend class ::grpc::testing::ServerContextTestSpouse; |
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friend class ::grpc::ServerInterface; |
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friend class ::grpc_impl::Server; |
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template <class W, class R> |
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friend class ::grpc::ServerAsyncReader; |
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template <class W> |
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friend class ::grpc::ServerAsyncWriter; |
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template <class W> |
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friend class ::grpc::ServerAsyncResponseWriter; |
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template <class W, class R> |
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friend class ::grpc::ServerAsyncReaderWriter; |
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template <class R> |
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friend class ::grpc::ServerReader; |
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template <class W> |
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friend class ::grpc::ServerWriter; |
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template <class W, class R> |
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friend class ::grpc::internal::ServerReaderWriterBody; |
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template <class ServiceType, class RequestType, class ResponseType> |
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friend class ::grpc::internal::RpcMethodHandler; |
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template <class ServiceType, class RequestType, class ResponseType> |
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friend class ::grpc::internal::ClientStreamingHandler; |
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template <class ServiceType, class RequestType, class ResponseType> |
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friend class ::grpc::internal::ServerStreamingHandler; |
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template <class Streamer, bool WriteNeeded> |
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friend class ::grpc::internal::TemplatedBidiStreamingHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc::internal::CallbackUnaryHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc::internal::CallbackClientStreamingHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc::internal::CallbackServerStreamingHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc::internal::CallbackBidiHandler; |
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template <::grpc::StatusCode code> |
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friend class ::grpc::internal::ErrorMethodHandler; |
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friend class ::grpc_impl::ClientContext; |
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friend class ::grpc::GenericServerContext; |
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/// Prevent copying.
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ServerContext(const ServerContext&); |
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ServerContext& operator=(const ServerContext&); |
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class CompletionOp; |
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void BeginCompletionOp(::grpc::internal::Call* call, |
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std::function<void(bool)> callback, |
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::grpc::internal::ServerReactor* reactor); |
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/// Return the tag queued by BeginCompletionOp()
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::grpc::internal::CompletionQueueTag* GetCompletionOpTag(); |
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ServerContext(gpr_timespec deadline, grpc_metadata_array* arr); |
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void set_call(grpc_call* call) { call_ = call; } |
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void BindDeadlineAndMetadata(gpr_timespec deadline, grpc_metadata_array* arr); |
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void Clear(); |
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void Setup(gpr_timespec deadline); |
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uint32_t initial_metadata_flags() const { return 0; } |
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void SetCancelCallback(std::function<void()> callback); |
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void ClearCancelCallback(); |
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::grpc::experimental::ServerRpcInfo* set_server_rpc_info( |
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const char* method, ::grpc::internal::RpcMethod::RpcType type, |
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const std::vector<std::unique_ptr< |
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::grpc::experimental::ServerInterceptorFactoryInterface>>& creators) { |
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if (creators.size() != 0) { |
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rpc_info_ = new ::grpc::experimental::ServerRpcInfo(this, method, type); |
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rpc_info_->RegisterInterceptors(creators); |
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} |
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return rpc_info_; |
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} |
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CompletionOp* completion_op_; |
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bool has_notify_when_done_tag_; |
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void* async_notify_when_done_tag_; |
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::grpc::internal::CallbackWithSuccessTag completion_tag_; |
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gpr_timespec deadline_; |
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grpc_call* call_; |
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::grpc_impl::CompletionQueue* cq_; |
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bool sent_initial_metadata_; |
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mutable std::shared_ptr<const ::grpc::AuthContext> auth_context_; |
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mutable ::grpc::internal::MetadataMap client_metadata_; |
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std::multimap<grpc::string, grpc::string> initial_metadata_; |
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std::multimap<grpc::string, grpc::string> trailing_metadata_; |
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bool compression_level_set_; |
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grpc_compression_level compression_level_; |
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grpc_compression_algorithm compression_algorithm_; |
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::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata, |
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::grpc::internal::CallOpSendMessage> |
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pending_ops_; |
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bool has_pending_ops_; |
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::grpc::experimental::ServerRpcInfo* rpc_info_; |
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}; |
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} // namespace grpc_impl
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#endif // GRPCPP_IMPL_CODEGEN_SERVER_CONTEXT_IMPL_H
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