1 // Copyright 2020 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #pragma once
15
16 #include "pw_bytes/span.h"
17 #include "pw_rpc/internal/method_union.h"
18 #include "pw_rpc/internal/raw_method.h"
19
20 namespace pw::rpc::internal {
21
22 // MethodUnion which stores only a raw method. For use in fully raw RPC
23 // services, without any additional memory overhead.
24 class RawMethodUnion : public MethodUnion {
25 public:
RawMethodUnion(RawMethod && method)26 constexpr RawMethodUnion(RawMethod&& method)
27 : impl_({.raw = std::move(method)}) {}
28
method()29 constexpr const Method& method() const { return impl_.method; }
raw_method()30 constexpr const RawMethod& raw_method() const { return impl_.raw; }
31
32 private:
33 union {
34 Method method;
35 RawMethod raw;
36 } impl_;
37 };
38
39 // Deduces the type of an implemented service method from its signature, and
40 // returns the appropriate MethodUnion object to invoke it.
41 template <auto method, MethodType type>
GetRawMethodFor(uint32_t id)42 constexpr RawMethod GetRawMethodFor(uint32_t id) {
43 if constexpr (RawMethod::matches<method>()) {
44 return GetMethodFor<method, RawMethod, type>(id);
45 } else {
46 return InvalidMethod<method, type, RawMethod>(id);
47 }
48 };
49
50 } // namespace pw::rpc::internal
51