mirror of https://github.com/grpc/grpc-web.git
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
/**
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*
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* Copyright 2018 Google LLC
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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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* https://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 NET_GRPC_GATEWAY_CODEC_DECODER_H_
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#define NET_GRPC_GATEWAY_CODEC_DECODER_H_
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#include <deque>
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#include <memory>
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#include <vector>
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#include "third_party/grpc/include/grpc++/support/byte_buffer.h"
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#include "third_party/grpc/include/grpc++/support/slice.h"
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namespace grpc {
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namespace gateway {
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// Interface for GRPC-Gateway decoders. A decoder instance records the internal
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// states during the processing of a request (stream). Decoder decodes different
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// front end protocols to GRPC backend.
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class Decoder {
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public:
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Decoder();
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virtual ~Decoder();
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Decoder(const Decoder&) = delete;
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Decoder& operator=(const Decoder&) = delete;
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// Appends a piece of data to decode.
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virtual void Append(Slice input);
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// Decodes the inputs passed to `Append()` since the last call to `Decode()`
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// and appends the decoded results to those available from `results()`.
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// This method may be invoked multiple times when processing a streamed
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// request.
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virtual Status Decode() = 0;
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// Returns the decoded messages.
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std::deque<std::unique_ptr<ByteBuffer>>* results() { return &results_; }
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protected:
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// Returns the buffered inputs. When the inputs are not enough to be decoded
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// into a new message they will be buffered in this field.
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std::vector<Slice>* inputs() { return &inputs_; }
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private:
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std::vector<Slice> inputs_;
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std::deque<std::unique_ptr<ByteBuffer>> results_;
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};
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} // namespace gateway
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} // namespace grpc
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#endif // NET_GRPC_GATEWAY_CODEC_DECODER_H_
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