1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/*
*
* Copyright 2019 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package grpc
import (
"google.golang.org/grpc/codes"
"google.golang.org/grpc/mem"
"google.golang.org/grpc/status"
)
// PreparedMsg is responsible for creating a Marshalled and Compressed object.
//
// # Experimental
//
// Notice: This type is EXPERIMENTAL and may be changed or removed in a
// later release.
type PreparedMsg struct {
// Struct for preparing msg before sending them
encodedData mem.BufferSlice
hdr []byte
payload mem.BufferSlice
pf payloadFormat
}
// Encode marshalls and compresses the message using the codec and compressor for the stream.
func (p *PreparedMsg) Encode(s Stream, msg any) error {
ctx := s.Context()
rpcInfo, ok := rpcInfoFromContext(ctx)
if !ok {
return status.Errorf(codes.Internal, "grpc: unable to get rpcInfo")
}
// check if the context has the relevant information to prepareMsg
if rpcInfo.preloaderInfo == nil {
return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo is nil")
}
if rpcInfo.preloaderInfo.codec == nil {
return status.Errorf(codes.Internal, "grpc: rpcInfo.preloaderInfo.codec is nil")
}
// prepare the msg
data, err := encode(rpcInfo.preloaderInfo.codec, msg)
if err != nil {
return err
}
materializedData := data.Materialize()
data.Free()
p.encodedData = mem.BufferSlice{mem.NewBuffer(&materializedData, nil)}
// TODO: it should be possible to grab the bufferPool from the underlying
// stream implementation with a type cast to its actual type (such as
// addrConnStream) and accessing the buffer pool directly.
var compData mem.BufferSlice
compData, p.pf, err = compress(p.encodedData, rpcInfo.preloaderInfo.cp, rpcInfo.preloaderInfo.comp, mem.DefaultBufferPool())
if err != nil {
return err
}
if p.pf.isCompressed() {
materializedCompData := compData.Materialize()
compData.Free()
compData = mem.BufferSlice{mem.NewBuffer(&materializedCompData, nil)}
}
p.hdr, p.payload = msgHeader(p.encodedData, compData, p.pf)
return nil
}
|
