| // Copyright 2021 The Pigweed 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 |
| // |
| // https://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. |
| #pragma once |
| |
| #include <cstdint> |
| |
| #include "pw_bytes/span.h" |
| #include "pw_rpc/internal/lock.h" |
| #include "pw_status/status.h" |
| |
| namespace pw::rpc { |
| namespace internal { |
| class Call; |
| } |
| |
| // The Writer class allows writing requests or responses to a streaming RPC. |
| // ClientWriter, ClientReaderWriter, ServerWriter, and ServerReaderWriter |
| // classes can be used as a generic Writer. |
| class Writer { |
| public: |
| Writer(const Writer&) = delete; |
| Writer(Writer&&) = delete; |
| |
| Writer& operator=(const Writer&) = delete; |
| Writer& operator=(Writer&&) = delete; |
| |
| bool active() const; |
| uint32_t channel_id() const; |
| |
| Status Write(ConstByteSpan payload) PW_LOCKS_EXCLUDED(internal::rpc_lock()); |
| |
| private: |
| // Only allow Call to inherit from Writer. This guarantees that Writers can |
| // always safely downcast to Call. |
| friend class internal::Call; |
| |
| // Writers cannot be created directly. They may only be used as a reference to |
| // an existing call object. |
| constexpr Writer() = default; |
| }; |
| |
| } // namespace pw::rpc |