65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
/*
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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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package grpc
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import (
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"google.golang.org/grpc/codes"
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"google.golang.org/grpc/status"
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)
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// PreparedMsg is responsible for creating a Marshalled and Compressed object.
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//
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// This API is EXPERIMENTAL.
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type PreparedMsg struct {
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// Struct for preparing msg before sending them
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encodedData []byte
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hdr []byte
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payload []byte
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}
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// Encode marshalls and compresses the message using the codec and compressor for the stream.
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func (p *PreparedMsg) Encode(s Stream, msg interface{}) error {
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ctx := s.Context()
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rpcInfo, ok := rpcInfoFromContext(ctx)
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if !ok {
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return status.Errorf(codes.Internal, "grpc: unable to get rpcInfo")
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}
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// check if the context has the relevant information to prepareMsg
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if rpcInfo.preloaderInfo == nil {
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return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo is nil")
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}
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if rpcInfo.preloaderInfo.codec == nil {
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return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo.codec is nil")
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}
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// prepare the msg
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data, err := encode(rpcInfo.preloaderInfo.codec, msg)
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if err != nil {
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return err
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}
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p.encodedData = data
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compData, err := compress(data, rpcInfo.preloaderInfo.cp, rpcInfo.preloaderInfo.comp)
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if err != nil {
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return err
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}
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p.hdr, p.payload = msgHeader(data, compData)
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return nil
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}
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