cubefs
67 строк · 1.9 Кб
1/*
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// Experimental
29//
30// Notice: This type is EXPERIMENTAL and may be changed or removed in a
31// later release.
32type PreparedMsg struct {
33// Struct for preparing msg before sending them
34encodedData []byte
35hdr []byte
36payload []byte
37}
38
39// Encode marshalls and compresses the message using the codec and compressor for the stream.
40func (p *PreparedMsg) Encode(s Stream, msg interface{}) error {
41ctx := s.Context()
42rpcInfo, ok := rpcInfoFromContext(ctx)
43if !ok {
44return status.Errorf(codes.Internal, "grpc: unable to get rpcInfo")
45}
46
47// check if the context has the relevant information to prepareMsg
48if rpcInfo.preloaderInfo == nil {
49return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo is nil")
50}
51if rpcInfo.preloaderInfo.codec == nil {
52return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo.codec is nil")
53}
54
55// prepare the msg
56data, err := encode(rpcInfo.preloaderInfo.codec, msg)
57if err != nil {
58return err
59}
60p.encodedData = data
61compData, err := compress(data, rpcInfo.preloaderInfo.cp, rpcInfo.preloaderInfo.comp)
62if err != nil {
63return err
64}
65p.hdr, p.payload = msgHeader(data, compData)
66return nil
67}
68