diff options
Diffstat (limited to 'vendor/google.golang.org/grpc/encoding/proto/proto.go')
-rw-r--r-- | vendor/google.golang.org/grpc/encoding/proto/proto.go | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/vendor/google.golang.org/grpc/encoding/proto/proto.go b/vendor/google.golang.org/grpc/encoding/proto/proto.go new file mode 100644 index 0000000..66b97a6 --- /dev/null +++ b/vendor/google.golang.org/grpc/encoding/proto/proto.go | |||
@@ -0,0 +1,110 @@ | |||
1 | /* | ||
2 | * | ||
3 | * Copyright 2018 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 | |||
19 | // Package proto defines the protobuf codec. Importing this package will | ||
20 | // register the codec. | ||
21 | package proto | ||
22 | |||
23 | import ( | ||
24 | "math" | ||
25 | "sync" | ||
26 | |||
27 | "github.com/golang/protobuf/proto" | ||
28 | "google.golang.org/grpc/encoding" | ||
29 | ) | ||
30 | |||
31 | // Name is the name registered for the proto compressor. | ||
32 | const Name = "proto" | ||
33 | |||
34 | func init() { | ||
35 | encoding.RegisterCodec(codec{}) | ||
36 | } | ||
37 | |||
38 | // codec is a Codec implementation with protobuf. It is the default codec for gRPC. | ||
39 | type codec struct{} | ||
40 | |||
41 | type cachedProtoBuffer struct { | ||
42 | lastMarshaledSize uint32 | ||
43 | proto.Buffer | ||
44 | } | ||
45 | |||
46 | func capToMaxInt32(val int) uint32 { | ||
47 | if val > math.MaxInt32 { | ||
48 | return uint32(math.MaxInt32) | ||
49 | } | ||
50 | return uint32(val) | ||
51 | } | ||
52 | |||
53 | func marshal(v interface{}, cb *cachedProtoBuffer) ([]byte, error) { | ||
54 | protoMsg := v.(proto.Message) | ||
55 | newSlice := make([]byte, 0, cb.lastMarshaledSize) | ||
56 | |||
57 | cb.SetBuf(newSlice) | ||
58 | cb.Reset() | ||
59 | if err := cb.Marshal(protoMsg); err != nil { | ||
60 | return nil, err | ||
61 | } | ||
62 | out := cb.Bytes() | ||
63 | cb.lastMarshaledSize = capToMaxInt32(len(out)) | ||
64 | return out, nil | ||
65 | } | ||
66 | |||
67 | func (codec) Marshal(v interface{}) ([]byte, error) { | ||
68 | if pm, ok := v.(proto.Marshaler); ok { | ||
69 | // object can marshal itself, no need for buffer | ||
70 | return pm.Marshal() | ||
71 | } | ||
72 | |||
73 | cb := protoBufferPool.Get().(*cachedProtoBuffer) | ||
74 | out, err := marshal(v, cb) | ||
75 | |||
76 | // put back buffer and lose the ref to the slice | ||
77 | cb.SetBuf(nil) | ||
78 | protoBufferPool.Put(cb) | ||
79 | return out, err | ||
80 | } | ||
81 | |||
82 | func (codec) Unmarshal(data []byte, v interface{}) error { | ||
83 | protoMsg := v.(proto.Message) | ||
84 | protoMsg.Reset() | ||
85 | |||
86 | if pu, ok := protoMsg.(proto.Unmarshaler); ok { | ||
87 | // object can unmarshal itself, no need for buffer | ||
88 | return pu.Unmarshal(data) | ||
89 | } | ||
90 | |||
91 | cb := protoBufferPool.Get().(*cachedProtoBuffer) | ||
92 | cb.SetBuf(data) | ||
93 | err := cb.Unmarshal(protoMsg) | ||
94 | cb.SetBuf(nil) | ||
95 | protoBufferPool.Put(cb) | ||
96 | return err | ||
97 | } | ||
98 | |||
99 | func (codec) Name() string { | ||
100 | return Name | ||
101 | } | ||
102 | |||
103 | var protoBufferPool = &sync.Pool{ | ||
104 | New: func() interface{} { | ||
105 | return &cachedProtoBuffer{ | ||
106 | Buffer: proto.Buffer{}, | ||
107 | lastMarshaledSize: 16, | ||
108 | } | ||
109 | }, | ||
110 | } | ||