mirror of https://github.com/grpc/grpc.git
Karthik Ravi Shankar
4 years ago
parent
0649026e8a
commit
56d7d9e804
24 changed files with 696 additions and 759 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 <atomic> |
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#include <cassert> |
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#include <map> |
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#include <memory> |
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#include <type_traits> |
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#include <vector> |
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#include <grpc/impl/codegen/port_platform.h> |
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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/message_allocator.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_callback_impl.h> |
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#include <grpcpp/impl/codegen/server_interceptor.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/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 Server; |
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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 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 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 RpcMethodHandler; |
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template <class Base> |
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class FinishOnlyReactor; |
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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 ServerStreamingHandler; |
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class ServerReactor; |
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template <class Streamer, bool WriteNeeded> |
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class TemplatedBidiStreamingHandler; |
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template <::grpc::StatusCode code> |
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class ErrorMethodHandler; |
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} // namespace internal
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} // namespace grpc_impl
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namespace grpc { |
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class CompletionQueue; |
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class GenericServerContext; |
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class ServerInterface; |
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#ifndef GRPC_CALLBACK_API_NONEXPERIMENTAL |
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namespace experimental { |
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#endif |
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class GenericCallbackServerContext; |
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#ifndef GRPC_CALLBACK_API_NONEXPERIMENTAL |
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} // namespace experimental
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#endif |
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namespace internal { |
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class Call; |
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} // namespace internal
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namespace testing { |
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class InteropServerContextInspector; |
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class ServerContextTestSpouse; |
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class DefaultReactorTestPeer; |
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} // namespace testing
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} // namespace grpc
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namespace grpc_impl { |
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/// Base class of ServerContext. Experimental until callback API is final.
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class ServerContextBase { |
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public: |
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virtual ~ServerContextBase(); |
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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 std::string& key, const std::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 std::string& key, const std::string& value); |
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/// Return whether this RPC failed before the server could provide its status
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/// back to the client. This could be because of explicit API cancellation
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/// from the client-side or server-side, because of deadline exceeded, network
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/// connection reset, HTTP/2 parameter configuration (e.g., max message size,
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/// max connection age), etc. It does NOT include failure due to a non-OK
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/// status return from the server application's request handler, including
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/// Status::CANCELLED.
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///
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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. Thread-safe.
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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. For example, if TryCancel() is called on a separate thread, it
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/// might race with the server handler which might return success to the
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/// client before 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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/// For reasons such as the above, it is generally preferred to explicitly
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/// finish an RPC by returning Status::CANCELLED rather than using TryCancel.
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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<std::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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std::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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/// 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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protected: |
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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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/// NOTE: This is an API for advanced users who need custom allocators.
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/// Get and maybe mutate the allocator state associated with the current RPC.
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/// Currently only applicable for callback unary RPC methods.
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/// WARNING: This is experimental API and could be changed or removed.
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::grpc::experimental::RpcAllocatorState* GetRpcAllocatorState() { |
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return message_allocator_state_; |
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} |
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/// Get a library-owned default unary reactor for use in minimal reaction
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/// cases. This supports typical unary RPC usage of providing a response and
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/// status. It supports immediate Finish (finish from within the method
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/// handler) or delayed Finish (finish called after the method handler
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/// invocation). It does not support reacting to cancellation or completion,
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/// or early sending of initial metadata. Since this is a library-owned
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/// reactor, it should not be delete'd or freed in any way. This is more
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/// efficient than creating a user-owned reactor both because of avoiding an
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/// allocation and because its minimal reactions are optimized using a core
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/// surface flag that allows their reactions to run inline without any
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/// thread-hop.
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///
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/// This method should not be called more than once or called after return
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/// from the method handler.
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///
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/// WARNING: This is experimental API and could be changed or removed.
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::grpc_impl::ServerUnaryReactor* DefaultReactor() { |
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// Short-circuit the case where a default reactor was already set up by
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// the TestPeer.
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if (test_unary_ != nullptr) { |
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return reinterpret_cast<Reactor*>(&default_reactor_); |
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} |
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new (&default_reactor_) Reactor; |
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#ifndef NDEBUG |
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bool old = false; |
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assert(default_reactor_used_.compare_exchange_strong( |
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old, true, std::memory_order_relaxed)); |
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#else |
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default_reactor_used_.store(true, std::memory_order_relaxed); |
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#endif |
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return reinterpret_cast<Reactor*>(&default_reactor_); |
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} |
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/// Constructors for use by derived classes
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ServerContextBase(); |
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ServerContextBase(gpr_timespec deadline, grpc_metadata_array* arr); |
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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::testing::DefaultReactorTestPeer; |
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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_impl::ServerAsyncReader; |
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template <class W> |
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friend class ::grpc_impl::ServerAsyncWriter; |
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template <class W> |
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friend class ::grpc_impl::ServerAsyncResponseWriter; |
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template <class W, class R> |
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friend class ::grpc_impl::ServerAsyncReaderWriter; |
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template <class R> |
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friend class ::grpc_impl::ServerReader; |
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template <class W> |
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friend class ::grpc_impl::ServerWriter; |
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template <class W, class R> |
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friend class ::grpc_impl::internal::ServerReaderWriterBody; |
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template <class ServiceType, class RequestType, class ResponseType> |
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friend class ::grpc_impl::internal::RpcMethodHandler; |
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template <class ServiceType, class RequestType, class ResponseType> |
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friend class ::grpc_impl::internal::ClientStreamingHandler; |
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template <class ServiceType, class RequestType, class ResponseType> |
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friend class ::grpc_impl::internal::ServerStreamingHandler; |
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template <class Streamer, bool WriteNeeded> |
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friend class ::grpc_impl::internal::TemplatedBidiStreamingHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc_impl::internal::CallbackUnaryHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc_impl::internal::CallbackClientStreamingHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc_impl::internal::CallbackServerStreamingHandler; |
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template <class RequestType, class ResponseType> |
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friend class ::grpc_impl::internal::CallbackBidiHandler; |
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template <::grpc::StatusCode code> |
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friend class ::grpc_impl::internal::ErrorMethodHandler; |
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template <class Base> |
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friend class ::grpc_impl::internal::FinishOnlyReactor; |
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friend class ::grpc_impl::ClientContext; |
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friend class ::grpc::GenericServerContext; |
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#ifdef GRPC_CALLBACK_API_NONEXPERIMENTAL |
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friend class ::grpc::GenericCallbackServerContext; |
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#else |
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friend class ::grpc::experimental::GenericCallbackServerContext; |
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#endif |
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/// Prevent copying.
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ServerContextBase(const ServerContextBase&); |
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ServerContextBase& operator=(const ServerContextBase&); |
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class CompletionOp; |
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void BeginCompletionOp( |
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::grpc::internal::Call* call, std::function<void(bool)> callback, |
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::grpc_impl::internal::ServerCallbackCall* callback_controller); |
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/// Return the tag queued by BeginCompletionOp()
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::grpc::internal::CompletionQueueTag* GetCompletionOpTag(); |
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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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::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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void set_message_allocator_state( |
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::grpc::experimental::RpcAllocatorState* allocator_state) { |
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message_allocator_state_ = allocator_state; |
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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::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<std::string, std::string> initial_metadata_; |
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std::multimap<std::string, std::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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::grpc::experimental::RpcAllocatorState* message_allocator_state_ = nullptr; |
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class Reactor : public ServerUnaryReactor { |
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public: |
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void OnCancel() override {} |
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void OnDone() override {} |
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// Override InternalInlineable for this class since its reactions are
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// trivial and thus do not need to be run from the executor (triggering a
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// thread hop). This should only be used by internal reactors (thus the
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// name) and not by user application code.
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bool InternalInlineable() override { return true; } |
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}; |
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void SetupTestDefaultReactor(std::function<void(::grpc::Status)> func) { |
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test_unary_.reset(new TestServerCallbackUnary(this, std::move(func))); |
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} |
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bool test_status_set() const { |
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return (test_unary_ != nullptr) && test_unary_->status_set(); |
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} |
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::grpc::Status test_status() const { return test_unary_->status(); } |
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class TestServerCallbackUnary : public ::grpc_impl::ServerCallbackUnary { |
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public: |
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TestServerCallbackUnary(ServerContextBase* ctx, |
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std::function<void(::grpc::Status)> func) |
||||
: reactor_(ctx->DefaultReactor()), func_(std::move(func)) { |
||||
this->BindReactor(reactor_); |
||||
} |
||||
void Finish(::grpc::Status s) override { |
||||
status_ = s; |
||||
func_(std::move(s)); |
||||
status_set_.store(true, std::memory_order_release); |
||||
} |
||||
void SendInitialMetadata() override {} |
||||
|
||||
bool status_set() const { |
||||
return status_set_.load(std::memory_order_acquire); |
||||
} |
||||
::grpc::Status status() const { return status_; } |
||||
|
||||
private: |
||||
void CallOnDone() override {} |
||||
::grpc_impl::internal::ServerReactor* reactor() override { |
||||
return reactor_; |
||||
} |
||||
|
||||
::grpc_impl::ServerUnaryReactor* const reactor_; |
||||
std::atomic_bool status_set_{false}; |
||||
::grpc::Status status_; |
||||
const std::function<void(::grpc::Status s)> func_; |
||||
}; |
||||
|
||||
typename std::aligned_storage<sizeof(Reactor), alignof(Reactor)>::type |
||||
default_reactor_; |
||||
std::atomic_bool default_reactor_used_{false}; |
||||
std::unique_ptr<TestServerCallbackUnary> test_unary_; |
||||
}; |
||||
|
||||
/// A ServerContext or CallbackServerContext allows the code 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 ServerContextBase { |
||||
public: |
||||
ServerContext() {} // for async calls
|
||||
|
||||
using ServerContextBase::AddInitialMetadata; |
||||
using ServerContextBase::AddTrailingMetadata; |
||||
using ServerContextBase::auth_context; |
||||
using ServerContextBase::c_call; |
||||
using ServerContextBase::census_context; |
||||
using ServerContextBase::client_metadata; |
||||
using ServerContextBase::compression_algorithm; |
||||
using ServerContextBase::compression_level; |
||||
using ServerContextBase::compression_level_set; |
||||
using ServerContextBase::deadline; |
||||
using ServerContextBase::IsCancelled; |
||||
using ServerContextBase::peer; |
||||
using ServerContextBase::raw_deadline; |
||||
using ServerContextBase::set_compression_algorithm; |
||||
using ServerContextBase::set_compression_level; |
||||
using ServerContextBase::SetLoadReportingCosts; |
||||
using ServerContextBase::TryCancel; |
||||
|
||||
// Sync/CQ-based Async ServerContext only
|
||||
using ServerContextBase::AsyncNotifyWhenDone; |
||||
|
||||
private: |
||||
// Constructor for internal use by server only
|
||||
friend class ::grpc_impl::Server; |
||||
ServerContext(gpr_timespec deadline, grpc_metadata_array* arr) |
||||
: ServerContextBase(deadline, arr) {} |
||||
|
||||
// CallbackServerContext only
|
||||
using ServerContextBase::DefaultReactor; |
||||
using ServerContextBase::GetRpcAllocatorState; |
||||
|
||||
/// Prevent copying.
|
||||
ServerContext(const ServerContext&) = delete; |
||||
ServerContext& operator=(const ServerContext&) = delete; |
||||
}; |
||||
|
||||
class CallbackServerContext : public ServerContextBase { |
||||
public: |
||||
/// Public constructors are for direct use only by mocking tests. In practice,
|
||||
/// these objects will be owned by the library.
|
||||
CallbackServerContext() {} |
||||
|
||||
using ServerContextBase::AddInitialMetadata; |
||||
using ServerContextBase::AddTrailingMetadata; |
||||
using ServerContextBase::auth_context; |
||||
using ServerContextBase::c_call; |
||||
using ServerContextBase::census_context; |
||||
using ServerContextBase::client_metadata; |
||||
using ServerContextBase::compression_algorithm; |
||||
using ServerContextBase::compression_level; |
||||
using ServerContextBase::compression_level_set; |
||||
using ServerContextBase::deadline; |
||||
using ServerContextBase::IsCancelled; |
||||
using ServerContextBase::peer; |
||||
using ServerContextBase::raw_deadline; |
||||
using ServerContextBase::set_compression_algorithm; |
||||
using ServerContextBase::set_compression_level; |
||||
using ServerContextBase::SetLoadReportingCosts; |
||||
using ServerContextBase::TryCancel; |
||||
|
||||
// CallbackServerContext only
|
||||
using ServerContextBase::DefaultReactor; |
||||
using ServerContextBase::GetRpcAllocatorState; |
||||
|
||||
private: |
||||
// Sync/CQ-based Async ServerContext only
|
||||
using ServerContextBase::AsyncNotifyWhenDone; |
||||
|
||||
/// Prevent copying.
|
||||
CallbackServerContext(const CallbackServerContext&) = delete; |
||||
CallbackServerContext& operator=(const CallbackServerContext&) = delete; |
||||
}; |
||||
|
||||
} // namespace grpc_impl
|
||||
|
||||
static_assert(std::is_base_of<::grpc_impl::ServerContextBase, |
||||
::grpc_impl::ServerContext>::value, |
||||
"improper base class"); |
||||
static_assert(std::is_base_of<::grpc_impl::ServerContextBase, |
||||
::grpc_impl::CallbackServerContext>::value, |
||||
"improper base class"); |
||||
static_assert(sizeof(::grpc_impl::ServerContextBase) == |
||||
sizeof(::grpc_impl::ServerContext), |
||||
"wrong size"); |
||||
static_assert(sizeof(::grpc_impl::ServerContextBase) == |
||||
sizeof(::grpc_impl::CallbackServerContext), |
||||
"wrong size"); |
||||
|
||||
#endif // GRPCPP_IMPL_CODEGEN_SERVER_CONTEXT_IMPL_H
|
||||
Loading…
Reference in new issue