Merge branch 'master' of https://github.com/grpc/grpc into bazel-0.26
Nicolas "Pixel" Noble
6 years ago
commit
29b5a83920
146 changed files with 2793 additions and 2348 deletions
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/*
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* |
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* Copyright 2015 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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/// A ClientContext allows the person implementing a service client to:
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///
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/// - Add custom metadata key-value pairs that will propagated to the server
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/// side.
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/// - Control call settings such as compression and authentication.
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/// - Initial and trailing metadata coming from the server.
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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 they are invoked with, that
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/// is to say, they aren't sticky. Some of these settings, such as the
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/// compression options, can be made persistent at channel construction time
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/// (see \a grpc::CreateCustomChannel).
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///
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/// \warning ClientContext instances should \em not be reused across rpcs.
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#ifndef GRPCPP_IMPL_CODEGEN_CLIENT_CONTEXT_IMPL_H |
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#define GRPCPP_IMPL_CODEGEN_CLIENT_CONTEXT_IMPL_H |
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#include <map> |
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#include <memory> |
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#include <mutex> |
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#include <string> |
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#include <grpc/impl/codegen/compression_types.h> |
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#include <grpc/impl/codegen/propagation_bits.h> |
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#include <grpcpp/impl/codegen/client_interceptor.h> |
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#include <grpcpp/impl/codegen/config.h> |
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#include <grpcpp/impl/codegen/core_codegen_interface.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/rpc_method.h> |
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#include <grpcpp/impl/codegen/security/auth_context.h> |
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#include <grpcpp/impl/codegen/slice.h> |
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#include <grpcpp/impl/codegen/status.h> |
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#include <grpcpp/impl/codegen/string_ref.h> |
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#include <grpcpp/impl/codegen/sync.h> |
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#include <grpcpp/impl/codegen/time.h> |
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struct census_context; |
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struct grpc_call; |
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namespace grpc { |
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class ChannelInterface; |
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namespace internal { |
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class RpcMethod; |
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class CallOpClientRecvStatus; |
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class CallOpRecvInitialMetadata; |
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template <class InputMessage, class OutputMessage> |
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class BlockingUnaryCallImpl; |
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template <class InputMessage, class OutputMessage> |
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class CallbackUnaryCallImpl; |
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template <class Request, class Response> |
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class ClientCallbackReaderWriterImpl; |
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template <class Response> |
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class ClientCallbackReaderImpl; |
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template <class Request> |
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class ClientCallbackWriterImpl; |
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class ClientCallbackUnaryImpl; |
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} // namespace internal
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template <class R> |
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class ClientReader; |
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template <class W> |
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class ClientWriter; |
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template <class W, class R> |
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class ClientReaderWriter; |
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template <class R> |
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class ClientAsyncReader; |
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template <class W> |
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class ClientAsyncWriter; |
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template <class W, class R> |
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class ClientAsyncReaderWriter; |
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template <class R> |
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class ClientAsyncResponseReader; |
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namespace testing { |
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class InteropClientContextInspector; |
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} // namespace testing
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} // namespace grpc
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namespace grpc_impl { |
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class CallCredentials; |
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class Channel; |
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class CompletionQueue; |
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class ServerContext; |
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/// Options for \a ClientContext::FromServerContext specifying which traits from
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/// the \a ServerContext to propagate (copy) from it into a new \a
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/// ClientContext.
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///
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/// \see ClientContext::FromServerContext
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class PropagationOptions { |
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public: |
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PropagationOptions() : propagate_(GRPC_PROPAGATE_DEFAULTS) {} |
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PropagationOptions& enable_deadline_propagation() { |
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propagate_ |= GRPC_PROPAGATE_DEADLINE; |
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return *this; |
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} |
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PropagationOptions& disable_deadline_propagation() { |
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propagate_ &= ~GRPC_PROPAGATE_DEADLINE; |
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return *this; |
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} |
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PropagationOptions& enable_census_stats_propagation() { |
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propagate_ |= GRPC_PROPAGATE_CENSUS_STATS_CONTEXT; |
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return *this; |
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} |
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PropagationOptions& disable_census_stats_propagation() { |
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propagate_ &= ~GRPC_PROPAGATE_CENSUS_STATS_CONTEXT; |
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return *this; |
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} |
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PropagationOptions& enable_census_tracing_propagation() { |
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propagate_ |= GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT; |
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return *this; |
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} |
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PropagationOptions& disable_census_tracing_propagation() { |
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propagate_ &= ~GRPC_PROPAGATE_CENSUS_TRACING_CONTEXT; |
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return *this; |
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} |
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PropagationOptions& enable_cancellation_propagation() { |
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propagate_ |= GRPC_PROPAGATE_CANCELLATION; |
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return *this; |
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} |
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PropagationOptions& disable_cancellation_propagation() { |
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propagate_ &= ~GRPC_PROPAGATE_CANCELLATION; |
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return *this; |
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} |
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uint32_t c_bitmask() const { return propagate_; } |
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private: |
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uint32_t propagate_; |
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}; |
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/// A ClientContext allows the person implementing a service client to:
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///
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/// - Add custom metadata key-value pairs that will propagated to the server
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/// side.
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/// - Control call settings such as compression and authentication.
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/// - Initial and trailing metadata coming from the server.
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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 they are invoked with, that
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/// is to say, they aren't sticky. Some of these settings, such as the
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/// compression options, can be made persistent at channel construction time
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/// (see \a grpc::CreateCustomChannel).
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///
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/// \warning ClientContext instances should \em not be reused across rpcs.
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/// \warning The ClientContext instance used for creating an rpc must remain
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/// alive and valid for the lifetime of the rpc.
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class ClientContext { |
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public: |
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ClientContext(); |
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~ClientContext(); |
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/// Create a new \a ClientContext as a child of an incoming server call,
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/// according to \a options (\see PropagationOptions).
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///
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/// \param server_context The source server context to use as the basis for
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/// constructing the client context.
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/// \param options The options controlling what to copy from the \a
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/// server_context.
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///
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/// \return A newly constructed \a ClientContext instance based on \a
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/// server_context, with traits propagated (copied) according to \a options.
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static std::unique_ptr<ClientContext> FromServerContext( |
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const grpc_impl::ServerContext& server_context, |
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PropagationOptions options = PropagationOptions()); |
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/// Add the (\a meta_key, \a meta_value) pair to the metadata associated with
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/// a client call. These are made available at the server side by the \a
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/// grpc::ServerContext::client_metadata() method.
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///
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/// \warning This method should only be called before invoking the rpc.
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///
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/// \param meta_key The metadata key. If \a meta_value is binary data, it must
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/// end in "-bin".
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/// \param meta_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 AddMetadata(const grpc::string& meta_key, |
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const grpc::string& meta_value); |
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/// Return a collection of initial metadata key-value pairs. Note that keys
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/// may happen more than once (ie, a \a std::multimap is returned).
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///
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/// \warning This method should only be called after initial metadata has been
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/// received. For streaming calls, see \a
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/// ClientReaderInterface::WaitForInitialMetadata().
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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>& |
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GetServerInitialMetadata() const { |
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GPR_CODEGEN_ASSERT(initial_metadata_received_); |
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return *recv_initial_metadata_.map(); |
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} |
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/// Return a collection of trailing metadata key-value pairs. Note that keys
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/// may happen more than once (ie, a \a std::multimap is returned).
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///
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/// \warning This method is only callable once the stream has finished.
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///
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/// \return A multimap of metadata trailing key-value pairs from the server.
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const std::multimap<grpc::string_ref, grpc::string_ref>& |
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GetServerTrailingMetadata() const { |
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// TODO(yangg) check finished
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return *trailing_metadata_.map(); |
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} |
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/// Set the deadline for the client call.
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///
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/// \warning This method should only be called before invoking the rpc.
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///
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/// \param deadline the deadline for the client call. Units are determined by
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/// the type used. The deadline is an absolute (not relative) time.
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template <typename T> |
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void set_deadline(const T& deadline) { |
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grpc::TimePoint<T> deadline_tp(deadline); |
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deadline_ = deadline_tp.raw_time(); |
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} |
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/// EXPERIMENTAL: Indicate that this request is idempotent.
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/// By default, RPCs are assumed to <i>not</i> be idempotent.
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///
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/// If true, the gRPC library assumes that it's safe to initiate
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/// this RPC multiple times.
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void set_idempotent(bool idempotent) { idempotent_ = idempotent; } |
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/// EXPERIMENTAL: Set this request to be cacheable.
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/// If set, grpc is free to use the HTTP GET verb for sending the request,
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/// with the possibility of receiving a cached response.
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void set_cacheable(bool cacheable) { cacheable_ = cacheable; } |
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/// EXPERIMENTAL: Trigger wait-for-ready or not on this request.
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/// See https://github.com/grpc/grpc/blob/master/doc/wait-for-ready.md.
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/// If set, if an RPC is made when a channel's connectivity state is
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/// TRANSIENT_FAILURE or CONNECTING, the call will not "fail fast",
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/// and the channel will wait until the channel is READY before making the
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/// call.
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void set_wait_for_ready(bool wait_for_ready) { |
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wait_for_ready_ = wait_for_ready; |
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wait_for_ready_explicitly_set_ = true; |
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} |
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/// DEPRECATED: Use set_wait_for_ready() instead.
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void set_fail_fast(bool fail_fast) { set_wait_for_ready(!fail_fast); } |
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/// Return the deadline for the client 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 client call's deadline.
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gpr_timespec raw_deadline() const { return deadline_; } |
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/// Set the per call authority header (see
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/// https://tools.ietf.org/html/rfc7540#section-8.1.2.3).
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void set_authority(const grpc::string& authority) { authority_ = authority; } |
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/// Return the authentication context for this client 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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/// Set credentials for the client call.
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///
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/// A credentials object encapsulates all the state needed by a client to
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/// authenticate with a server and make various assertions, e.g., about the
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/// client’s identity, role, or whether it is authorized to make a particular
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/// call.
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///
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/// \see https://grpc.io/docs/guides/auth.html
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void set_credentials( |
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const std::shared_ptr<grpc_impl::CallCredentials>& creds) { |
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creds_ = creds; |
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} |
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/// Return the compression algorithm the client 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.
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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 client call.
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///
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/// \param algorithm The compression algorithm used for the client call.
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void set_compression_algorithm(grpc_compression_algorithm algorithm); |
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/// Flag whether the initial metadata should be \a corked
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///
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/// If \a corked is true, then the initial metadata will be coalesced with the
|
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/// write of first message in the stream. As a result, any tag set for the
|
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/// initial metadata operation (starting a client-streaming or bidi-streaming
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/// RPC) will not actually be sent to the completion queue or delivered
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/// via Next.
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///
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|
/// \param corked The flag indicating whether the initial metadata is to be
|
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/// corked or not.
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|
void set_initial_metadata_corked(bool corked) { |
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|
initial_metadata_corked_ = corked; |
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} |
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/// Return the peer uri in a string.
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///
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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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|
///
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|
/// \return The call's peer URI.
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grpc::string peer() const; |
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/// Get and set census context.
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void set_census_context(struct census_context* ccp) { census_context_ = ccp; } |
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struct census_context* census_context() const { |
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return census_context_; |
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} |
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/// Send a best-effort out-of-band cancel on the call associated with
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/// this client context. The call could be in any stage; e.g., if it is
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/// already finished, it may still return success.
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///
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/// There is no guarantee the call will be cancelled.
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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(); |
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||||||
|
/// Global Callbacks
|
||||||
|
///
|
||||||
|
/// Can be set exactly once per application to install hooks whenever
|
||||||
|
/// a client context is constructed and destructed.
|
||||||
|
class GlobalCallbacks { |
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|
public: |
||||||
|
virtual ~GlobalCallbacks() {} |
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|
virtual void DefaultConstructor(ClientContext* context) = 0; |
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|
virtual void Destructor(ClientContext* context) = 0; |
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|
}; |
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|
static void SetGlobalCallbacks(GlobalCallbacks* callbacks); |
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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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|
||||||
|
/// EXPERIMENTAL debugging API
|
||||||
|
///
|
||||||
|
/// if status is not ok() for an RPC, this will return a detailed string
|
||||||
|
/// of the gRPC Core error that led to the failure. It should not be relied
|
||||||
|
/// upon for anything other than gaining more debug data in failure cases.
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||||||
|
grpc::string debug_error_string() const { return debug_error_string_; } |
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|
|
||||||
|
private: |
||||||
|
// Disallow copy and assign.
|
||||||
|
ClientContext(const ClientContext&); |
||||||
|
ClientContext& operator=(const ClientContext&); |
||||||
|
|
||||||
|
friend class ::grpc::testing::InteropClientContextInspector; |
||||||
|
friend class ::grpc::internal::CallOpClientRecvStatus; |
||||||
|
friend class ::grpc::internal::CallOpRecvInitialMetadata; |
||||||
|
friend class ::grpc_impl::Channel; |
||||||
|
template <class R> |
||||||
|
friend class ::grpc::ClientReader; |
||||||
|
template <class W> |
||||||
|
friend class ::grpc::ClientWriter; |
||||||
|
template <class W, class R> |
||||||
|
friend class ::grpc::ClientReaderWriter; |
||||||
|
template <class R> |
||||||
|
friend class ::grpc::ClientAsyncReader; |
||||||
|
template <class W> |
||||||
|
friend class ::grpc::ClientAsyncWriter; |
||||||
|
template <class W, class R> |
||||||
|
friend class ::grpc::ClientAsyncReaderWriter; |
||||||
|
template <class R> |
||||||
|
friend class ::grpc::ClientAsyncResponseReader; |
||||||
|
template <class InputMessage, class OutputMessage> |
||||||
|
friend class ::grpc::internal::BlockingUnaryCallImpl; |
||||||
|
template <class InputMessage, class OutputMessage> |
||||||
|
friend class ::grpc::internal::CallbackUnaryCallImpl; |
||||||
|
template <class Request, class Response> |
||||||
|
friend class ::grpc::internal::ClientCallbackReaderWriterImpl; |
||||||
|
template <class Response> |
||||||
|
friend class ::grpc::internal::ClientCallbackReaderImpl; |
||||||
|
template <class Request> |
||||||
|
friend class ::grpc::internal::ClientCallbackWriterImpl; |
||||||
|
friend class ::grpc::internal::ClientCallbackUnaryImpl; |
||||||
|
|
||||||
|
// Used by friend class CallOpClientRecvStatus
|
||||||
|
void set_debug_error_string(const grpc::string& debug_error_string) { |
||||||
|
debug_error_string_ = debug_error_string; |
||||||
|
} |
||||||
|
|
||||||
|
grpc_call* call() const { return call_; } |
||||||
|
void set_call(grpc_call* call, |
||||||
|
const std::shared_ptr<::grpc_impl::Channel>& channel); |
||||||
|
|
||||||
|
grpc::experimental::ClientRpcInfo* set_client_rpc_info( |
||||||
|
const char* method, grpc::internal::RpcMethod::RpcType type, |
||||||
|
grpc::ChannelInterface* channel, |
||||||
|
const std::vector<std::unique_ptr< |
||||||
|
grpc::experimental::ClientInterceptorFactoryInterface>>& creators, |
||||||
|
size_t interceptor_pos) { |
||||||
|
rpc_info_ = grpc::experimental::ClientRpcInfo(this, type, method, channel); |
||||||
|
rpc_info_.RegisterInterceptors(creators, interceptor_pos); |
||||||
|
return &rpc_info_; |
||||||
|
} |
||||||
|
|
||||||
|
uint32_t initial_metadata_flags() const { |
||||||
|
return (idempotent_ ? GRPC_INITIAL_METADATA_IDEMPOTENT_REQUEST : 0) | |
||||||
|
(wait_for_ready_ ? GRPC_INITIAL_METADATA_WAIT_FOR_READY : 0) | |
||||||
|
(cacheable_ ? GRPC_INITIAL_METADATA_CACHEABLE_REQUEST : 0) | |
||||||
|
(wait_for_ready_explicitly_set_ |
||||||
|
? GRPC_INITIAL_METADATA_WAIT_FOR_READY_EXPLICITLY_SET |
||||||
|
: 0) | |
||||||
|
(initial_metadata_corked_ ? GRPC_INITIAL_METADATA_CORKED : 0); |
||||||
|
} |
||||||
|
|
||||||
|
grpc::string authority() { return authority_; } |
||||||
|
|
||||||
|
void SendCancelToInterceptors(); |
||||||
|
|
||||||
|
bool initial_metadata_received_; |
||||||
|
bool wait_for_ready_; |
||||||
|
bool wait_for_ready_explicitly_set_; |
||||||
|
bool idempotent_; |
||||||
|
bool cacheable_; |
||||||
|
std::shared_ptr<::grpc_impl::Channel> channel_; |
||||||
|
grpc::internal::Mutex mu_; |
||||||
|
grpc_call* call_; |
||||||
|
bool call_canceled_; |
||||||
|
gpr_timespec deadline_; |
||||||
|
grpc::string authority_; |
||||||
|
std::shared_ptr<grpc_impl::CallCredentials> creds_; |
||||||
|
mutable std::shared_ptr<const grpc::AuthContext> auth_context_; |
||||||
|
struct census_context* census_context_; |
||||||
|
std::multimap<grpc::string, grpc::string> send_initial_metadata_; |
||||||
|
mutable grpc::internal::MetadataMap recv_initial_metadata_; |
||||||
|
mutable grpc::internal::MetadataMap trailing_metadata_; |
||||||
|
|
||||||
|
grpc_call* propagate_from_call_; |
||||||
|
PropagationOptions propagation_options_; |
||||||
|
|
||||||
|
grpc_compression_algorithm compression_algorithm_; |
||||||
|
bool initial_metadata_corked_; |
||||||
|
|
||||||
|
grpc::string debug_error_string_; |
||||||
|
|
||||||
|
grpc::experimental::ClientRpcInfo rpc_info_; |
||||||
|
}; |
||||||
|
|
||||||
|
} // namespace grpc_impl
|
||||||
|
|
||||||
|
#endif // GRPCPP_IMPL_CODEGEN_CLIENT_CONTEXT_IMPL_H
|
||||||
@ -0,0 +1,376 @@ |
|||||||
|
/*
|
||||||
|
* |
||||||
|
* Copyright 2019 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 GRPCPP_IMPL_CODEGEN_SERVER_CONTEXT_IMPL_H |
||||||
|
#define GRPCPP_IMPL_CODEGEN_SERVER_CONTEXT_IMPL_H |
||||||
|
#include <map> |
||||||
|
#include <memory> |
||||||
|
#include <vector> |
||||||
|
|
||||||
|
#include <grpc/impl/codegen/compression_types.h> |
||||||
|
|
||||||
|
#include <grpcpp/impl/codegen/call.h> |
||||||
|
#include <grpcpp/impl/codegen/call_op_set.h> |
||||||
|
#include <grpcpp/impl/codegen/callback_common.h> |
||||||
|
#include <grpcpp/impl/codegen/completion_queue_tag.h> |
||||||
|
#include <grpcpp/impl/codegen/config.h> |
||||||
|
#include <grpcpp/impl/codegen/create_auth_context.h> |
||||||
|
#include <grpcpp/impl/codegen/metadata_map.h> |
||||||
|
#include <grpcpp/impl/codegen/security/auth_context.h> |
||||||
|
#include <grpcpp/impl/codegen/server_interceptor.h> |
||||||
|
#include <grpcpp/impl/codegen/string_ref.h> |
||||||
|
#include <grpcpp/impl/codegen/time.h> |
||||||
|
|
||||||
|
struct grpc_metadata; |
||||||
|
struct grpc_call; |
||||||
|
struct census_context; |
||||||
|
|
||||||
|
namespace grpc_impl { |
||||||
|
class ClientContext; |
||||||
|
class CompletionQueue; |
||||||
|
class Server; |
||||||
|
} // namespace grpc_impl
|
||||||
|
namespace grpc { |
||||||
|
class GenericServerContext; |
||||||
|
class ServerInterface; |
||||||
|
template <class W, class R> |
||||||
|
class ServerAsyncReader; |
||||||
|
template <class W> |
||||||
|
class ServerAsyncWriter; |
||||||
|
template <class W> |
||||||
|
class ServerAsyncResponseWriter; |
||||||
|
template <class W, class R> |
||||||
|
class ServerAsyncReaderWriter; |
||||||
|
template <class R> |
||||||
|
class ServerReader; |
||||||
|
template <class W> |
||||||
|
class ServerWriter; |
||||||
|
|
||||||
|
namespace internal { |
||||||
|
template <class W, class R> |
||||||
|
class ServerReaderWriterBody; |
||||||
|
template <class ServiceType, class RequestType, class ResponseType> |
||||||
|
class RpcMethodHandler; |
||||||
|
template <class ServiceType, class RequestType, class ResponseType> |
||||||
|
class ClientStreamingHandler; |
||||||
|
template <class ServiceType, class RequestType, class ResponseType> |
||||||
|
class ServerStreamingHandler; |
||||||
|
template <class ServiceType, class RequestType, class ResponseType> |
||||||
|
class BidiStreamingHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
class CallbackUnaryHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
class CallbackClientStreamingHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
class CallbackServerStreamingHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
class CallbackBidiHandler; |
||||||
|
template <class Streamer, bool WriteNeeded> |
||||||
|
class TemplatedBidiStreamingHandler; |
||||||
|
template <StatusCode code> |
||||||
|
class ErrorMethodHandler; |
||||||
|
class Call; |
||||||
|
class ServerReactor; |
||||||
|
} // namespace internal
|
||||||
|
|
||||||
|
class ServerInterface; |
||||||
|
namespace testing { |
||||||
|
class InteropServerContextInspector; |
||||||
|
class ServerContextTestSpouse; |
||||||
|
} // namespace testing
|
||||||
|
} // namespace grpc
|
||||||
|
|
||||||
|
namespace grpc_impl { |
||||||
|
/// A ServerContext allows the person implementing a service handler to:
|
||||||
|
///
|
||||||
|
/// - Add custom initial and trailing metadata key-value pairs that will
|
||||||
|
/// propagated to the client side.
|
||||||
|
/// - Control call settings such as compression and authentication.
|
||||||
|
/// - Access metadata coming from the client.
|
||||||
|
/// - Get performance metrics (ie, census).
|
||||||
|
///
|
||||||
|
/// Context settings are only relevant to the call handler they are supplied to,
|
||||||
|
/// that is to say, they aren't sticky across multiple calls. Some of these
|
||||||
|
/// settings, such as the compression options, can be made persistent at server
|
||||||
|
/// construction time by specifying the appropriate \a ChannelArguments
|
||||||
|
/// to a \a grpc::ServerBuilder, via \a ServerBuilder::AddChannelArgument.
|
||||||
|
///
|
||||||
|
/// \warning ServerContext instances should \em not be reused across rpcs.
|
||||||
|
class ServerContext { |
||||||
|
public: |
||||||
|
ServerContext(); // for async calls
|
||||||
|
~ServerContext(); |
||||||
|
|
||||||
|
/// Return the deadline for the server call.
|
||||||
|
std::chrono::system_clock::time_point deadline() const { |
||||||
|
return ::grpc::Timespec2Timepoint(deadline_); |
||||||
|
} |
||||||
|
|
||||||
|
/// Return a \a gpr_timespec representation of the server call's deadline.
|
||||||
|
gpr_timespec raw_deadline() const { return deadline_; } |
||||||
|
|
||||||
|
/// Add the (\a key, \a value) pair to the initial metadata
|
||||||
|
/// associated with a server call. These are made available at the client side
|
||||||
|
/// by the \a grpc::ClientContext::GetServerInitialMetadata() method.
|
||||||
|
///
|
||||||
|
/// \warning This method should only be called before sending initial metadata
|
||||||
|
/// to the client (which can happen explicitly, or implicitly when sending a
|
||||||
|
/// a response message or status to the client).
|
||||||
|
///
|
||||||
|
/// \param key The metadata key. If \a value is binary data, it must
|
||||||
|
/// end in "-bin".
|
||||||
|
/// \param value The metadata value. If its value is binary, the key name
|
||||||
|
/// must end in "-bin".
|
||||||
|
///
|
||||||
|
/// Metadata must conform to the following format:
|
||||||
|
/// Custom-Metadata -> Binary-Header / ASCII-Header
|
||||||
|
/// Binary-Header -> {Header-Name "-bin" } {binary value}
|
||||||
|
/// ASCII-Header -> Header-Name ASCII-Value
|
||||||
|
/// Header-Name -> 1*( %x30-39 / %x61-7A / "_" / "-" / ".") ; 0-9 a-z _ - .
|
||||||
|
/// ASCII-Value -> 1*( %x20-%x7E ) ; space and printable ASCII
|
||||||
|
void AddInitialMetadata(const grpc::string& key, const grpc::string& value); |
||||||
|
|
||||||
|
/// Add the (\a key, \a value) pair to the initial metadata
|
||||||
|
/// associated with a server call. These are made available at the client
|
||||||
|
/// side by the \a grpc::ClientContext::GetServerTrailingMetadata() method.
|
||||||
|
///
|
||||||
|
/// \warning This method should only be called before sending trailing
|
||||||
|
/// metadata to the client (which happens when the call is finished and a
|
||||||
|
/// status is sent to the client).
|
||||||
|
///
|
||||||
|
/// \param key The metadata key. If \a value is binary data,
|
||||||
|
/// it must end in "-bin".
|
||||||
|
/// \param value The metadata value. If its value is binary, the key name
|
||||||
|
/// must end in "-bin".
|
||||||
|
///
|
||||||
|
/// Metadata must conform to the following format:
|
||||||
|
/// Custom-Metadata -> Binary-Header / ASCII-Header
|
||||||
|
/// Binary-Header -> {Header-Name "-bin" } {binary value}
|
||||||
|
/// ASCII-Header -> Header-Name ASCII-Value
|
||||||
|
/// Header-Name -> 1*( %x30-39 / %x61-7A / "_" / "-" / ".") ; 0-9 a-z _ - .
|
||||||
|
/// ASCII-Value -> 1*( %x20-%x7E ) ; space and printable ASCII
|
||||||
|
void AddTrailingMetadata(const grpc::string& key, const grpc::string& value); |
||||||
|
|
||||||
|
/// IsCancelled is always safe to call when using sync or callback API.
|
||||||
|
/// When using async API, it is only safe to call IsCancelled after
|
||||||
|
/// the AsyncNotifyWhenDone tag has been delivered.
|
||||||
|
bool IsCancelled() const; |
||||||
|
|
||||||
|
/// Cancel the Call from the server. This is a best-effort API and
|
||||||
|
/// depending on when it is called, the RPC may still appear successful to
|
||||||
|
/// the client.
|
||||||
|
/// For example, if TryCancel() is called on a separate thread, it might race
|
||||||
|
/// with the server handler which might return success to the client before
|
||||||
|
/// TryCancel() was even started by the thread.
|
||||||
|
///
|
||||||
|
/// It is the caller's responsibility to prevent such races and ensure that if
|
||||||
|
/// TryCancel() is called, the serverhandler must return Status::CANCELLED.
|
||||||
|
/// The only exception is that if the serverhandler is already returning an
|
||||||
|
/// error status code, it is ok to not return Status::CANCELLED even if
|
||||||
|
/// TryCancel() was called.
|
||||||
|
///
|
||||||
|
/// Note that TryCancel() does not change any of the tags that are pending
|
||||||
|
/// on the completion queue. All pending tags will still be delivered
|
||||||
|
/// (though their ok result may reflect the effect of cancellation).
|
||||||
|
void TryCancel() const; |
||||||
|
|
||||||
|
/// Return a collection of initial metadata key-value pairs sent from the
|
||||||
|
/// client. Note that keys may happen more than
|
||||||
|
/// once (ie, a \a std::multimap is returned).
|
||||||
|
///
|
||||||
|
/// It is safe to use this method after initial metadata has been received,
|
||||||
|
/// Calls always begin with the client sending initial metadata, so this is
|
||||||
|
/// safe to access as soon as the call has begun on the server side.
|
||||||
|
///
|
||||||
|
/// \return A multimap of initial metadata key-value pairs from the server.
|
||||||
|
const std::multimap<grpc::string_ref, grpc::string_ref>& client_metadata() |
||||||
|
const { |
||||||
|
return *client_metadata_.map(); |
||||||
|
} |
||||||
|
|
||||||
|
/// Return the compression algorithm to be used by the server call.
|
||||||
|
grpc_compression_level compression_level() const { |
||||||
|
return compression_level_; |
||||||
|
} |
||||||
|
|
||||||
|
/// Set \a level to be the compression level used for the server call.
|
||||||
|
///
|
||||||
|
/// \param level The compression level used for the server call.
|
||||||
|
void set_compression_level(grpc_compression_level level) { |
||||||
|
compression_level_set_ = true; |
||||||
|
compression_level_ = level; |
||||||
|
} |
||||||
|
|
||||||
|
/// Return a bool indicating whether the compression level for this call
|
||||||
|
/// has been set (either implicitly or through a previous call to
|
||||||
|
/// \a set_compression_level.
|
||||||
|
bool compression_level_set() const { return compression_level_set_; } |
||||||
|
|
||||||
|
/// Return the compression algorithm the server call will request be used.
|
||||||
|
/// Note that the gRPC runtime may decide to ignore this request, for example,
|
||||||
|
/// due to resource constraints, or if the server is aware the client doesn't
|
||||||
|
/// support the requested algorithm.
|
||||||
|
grpc_compression_algorithm compression_algorithm() const { |
||||||
|
return compression_algorithm_; |
||||||
|
} |
||||||
|
/// Set \a algorithm to be the compression algorithm used for the server call.
|
||||||
|
///
|
||||||
|
/// \param algorithm The compression algorithm used for the server call.
|
||||||
|
void set_compression_algorithm(grpc_compression_algorithm algorithm); |
||||||
|
|
||||||
|
/// Set the serialized load reporting costs in \a cost_data for the call.
|
||||||
|
void SetLoadReportingCosts(const std::vector<grpc::string>& cost_data); |
||||||
|
|
||||||
|
/// Return the authentication context for this server call.
|
||||||
|
///
|
||||||
|
/// \see grpc::AuthContext.
|
||||||
|
std::shared_ptr<const ::grpc::AuthContext> auth_context() const { |
||||||
|
if (auth_context_.get() == nullptr) { |
||||||
|
auth_context_ = ::grpc::CreateAuthContext(call_); |
||||||
|
} |
||||||
|
return auth_context_; |
||||||
|
} |
||||||
|
|
||||||
|
/// Return the peer uri in a string.
|
||||||
|
/// WARNING: this value is never authenticated or subject to any security
|
||||||
|
/// related code. It must not be used for any authentication related
|
||||||
|
/// functionality. Instead, use auth_context.
|
||||||
|
grpc::string peer() const; |
||||||
|
|
||||||
|
/// Get the census context associated with this server call.
|
||||||
|
const struct census_context* census_context() const; |
||||||
|
|
||||||
|
/// Async only. Has to be called before the rpc starts.
|
||||||
|
/// Returns the tag in completion queue when the rpc finishes.
|
||||||
|
/// IsCancelled() can then be called to check whether the rpc was cancelled.
|
||||||
|
/// TODO(vjpai): Fix this so that the tag is returned even if the call never
|
||||||
|
/// starts (https://github.com/grpc/grpc/issues/10136).
|
||||||
|
void AsyncNotifyWhenDone(void* tag) { |
||||||
|
has_notify_when_done_tag_ = true; |
||||||
|
async_notify_when_done_tag_ = tag; |
||||||
|
} |
||||||
|
|
||||||
|
/// Should be used for framework-level extensions only.
|
||||||
|
/// Applications never need to call this method.
|
||||||
|
grpc_call* c_call() { return call_; } |
||||||
|
|
||||||
|
private: |
||||||
|
friend class ::grpc::testing::InteropServerContextInspector; |
||||||
|
friend class ::grpc::testing::ServerContextTestSpouse; |
||||||
|
friend class ::grpc::ServerInterface; |
||||||
|
friend class ::grpc_impl::Server; |
||||||
|
template <class W, class R> |
||||||
|
friend class ::grpc::ServerAsyncReader; |
||||||
|
template <class W> |
||||||
|
friend class ::grpc::ServerAsyncWriter; |
||||||
|
template <class W> |
||||||
|
friend class ::grpc::ServerAsyncResponseWriter; |
||||||
|
template <class W, class R> |
||||||
|
friend class ::grpc::ServerAsyncReaderWriter; |
||||||
|
template <class R> |
||||||
|
friend class ::grpc::ServerReader; |
||||||
|
template <class W> |
||||||
|
friend class ::grpc::ServerWriter; |
||||||
|
template <class W, class R> |
||||||
|
friend class ::grpc::internal::ServerReaderWriterBody; |
||||||
|
template <class ServiceType, class RequestType, class ResponseType> |
||||||
|
friend class ::grpc::internal::RpcMethodHandler; |
||||||
|
template <class ServiceType, class RequestType, class ResponseType> |
||||||
|
friend class ::grpc::internal::ClientStreamingHandler; |
||||||
|
template <class ServiceType, class RequestType, class ResponseType> |
||||||
|
friend class ::grpc::internal::ServerStreamingHandler; |
||||||
|
template <class Streamer, bool WriteNeeded> |
||||||
|
friend class ::grpc::internal::TemplatedBidiStreamingHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
friend class ::grpc::internal::CallbackUnaryHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
friend class ::grpc::internal::CallbackClientStreamingHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
friend class ::grpc::internal::CallbackServerStreamingHandler; |
||||||
|
template <class RequestType, class ResponseType> |
||||||
|
friend class ::grpc::internal::CallbackBidiHandler; |
||||||
|
template <::grpc::StatusCode code> |
||||||
|
friend class ::grpc::internal::ErrorMethodHandler; |
||||||
|
friend class ::grpc_impl::ClientContext; |
||||||
|
friend class ::grpc::GenericServerContext; |
||||||
|
|
||||||
|
/// Prevent copying.
|
||||||
|
ServerContext(const ServerContext&); |
||||||
|
ServerContext& operator=(const ServerContext&); |
||||||
|
|
||||||
|
class CompletionOp; |
||||||
|
|
||||||
|
void BeginCompletionOp(::grpc::internal::Call* call, |
||||||
|
std::function<void(bool)> callback, |
||||||
|
::grpc::internal::ServerReactor* reactor); |
||||||
|
/// Return the tag queued by BeginCompletionOp()
|
||||||
|
::grpc::internal::CompletionQueueTag* GetCompletionOpTag(); |
||||||
|
|
||||||
|
ServerContext(gpr_timespec deadline, grpc_metadata_array* arr); |
||||||
|
|
||||||
|
void set_call(grpc_call* call) { call_ = call; } |
||||||
|
|
||||||
|
void BindDeadlineAndMetadata(gpr_timespec deadline, grpc_metadata_array* arr); |
||||||
|
|
||||||
|
void Clear(); |
||||||
|
|
||||||
|
void Setup(gpr_timespec deadline); |
||||||
|
|
||||||
|
uint32_t initial_metadata_flags() const { return 0; } |
||||||
|
|
||||||
|
void SetCancelCallback(std::function<void()> callback); |
||||||
|
void ClearCancelCallback(); |
||||||
|
|
||||||
|
::grpc::experimental::ServerRpcInfo* set_server_rpc_info( |
||||||
|
const char* method, ::grpc::internal::RpcMethod::RpcType type, |
||||||
|
const std::vector<std::unique_ptr< |
||||||
|
::grpc::experimental::ServerInterceptorFactoryInterface>>& creators) { |
||||||
|
if (creators.size() != 0) { |
||||||
|
rpc_info_ = new ::grpc::experimental::ServerRpcInfo(this, method, type); |
||||||
|
rpc_info_->RegisterInterceptors(creators); |
||||||
|
} |
||||||
|
return rpc_info_; |
||||||
|
} |
||||||
|
|
||||||
|
CompletionOp* completion_op_; |
||||||
|
bool has_notify_when_done_tag_; |
||||||
|
void* async_notify_when_done_tag_; |
||||||
|
::grpc::internal::CallbackWithSuccessTag completion_tag_; |
||||||
|
|
||||||
|
gpr_timespec deadline_; |
||||||
|
grpc_call* call_; |
||||||
|
::grpc_impl::CompletionQueue* cq_; |
||||||
|
bool sent_initial_metadata_; |
||||||
|
mutable std::shared_ptr<const ::grpc::AuthContext> auth_context_; |
||||||
|
mutable ::grpc::internal::MetadataMap client_metadata_; |
||||||
|
std::multimap<grpc::string, grpc::string> initial_metadata_; |
||||||
|
std::multimap<grpc::string, grpc::string> trailing_metadata_; |
||||||
|
|
||||||
|
bool compression_level_set_; |
||||||
|
grpc_compression_level compression_level_; |
||||||
|
grpc_compression_algorithm compression_algorithm_; |
||||||
|
|
||||||
|
::grpc::internal::CallOpSet<::grpc::internal::CallOpSendInitialMetadata, |
||||||
|
::grpc::internal::CallOpSendMessage> |
||||||
|
pending_ops_; |
||||||
|
bool has_pending_ops_; |
||||||
|
|
||||||
|
::grpc::experimental::ServerRpcInfo* rpc_info_; |
||||||
|
}; |
||||||
|
} // namespace grpc_impl
|
||||||
|
#endif // GRPCPP_IMPL_CODEGEN_SERVER_CONTEXT_IMPL_H
|
||||||
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