blob: 76acbbcc93b91b0360285aa7c1d9ac95187bbb32 [file] [log] [blame]
Scott Baker105df152020-04-13 15:55:14 -07001/*
2 *
3 * Copyright 2019 gRPC authors.
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 */
18
19package grpc
20
21import (
22 "google.golang.org/grpc/codes"
23 "google.golang.org/grpc/status"
24)
25
26// PreparedMsg is responsible for creating a Marshalled and Compressed object.
27//
28// This API is EXPERIMENTAL.
29type PreparedMsg struct {
30 // Struct for preparing msg before sending them
31 encodedData []byte
32 hdr []byte
33 payload []byte
34}
35
36// Encode marshalls and compresses the message using the codec and compressor for the stream.
37func (p *PreparedMsg) Encode(s Stream, msg interface{}) error {
38 ctx := s.Context()
39 rpcInfo, ok := rpcInfoFromContext(ctx)
40 if !ok {
41 return status.Errorf(codes.Internal, "grpc: unable to get rpcInfo")
42 }
43
44 // check if the context has the relevant information to prepareMsg
45 if rpcInfo.preloaderInfo == nil {
46 return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo is nil")
47 }
48 if rpcInfo.preloaderInfo.codec == nil {
49 return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo.codec is nil")
50 }
51
52 // prepare the msg
53 data, err := encode(rpcInfo.preloaderInfo.codec, msg)
54 if err != nil {
55 return err
56 }
57 p.encodedData = data
58 compData, err := compress(data, rpcInfo.preloaderInfo.cp, rpcInfo.preloaderInfo.comp)
59 if err != nil {
60 return err
61 }
62 p.hdr, p.payload = msgHeader(data, compData)
63 return nil
64}