forked from anjmao/go2proto
-
Notifications
You must be signed in to change notification settings - Fork 0
/
current_proto.go
118 lines (101 loc) · 2.45 KB
/
current_proto.go
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
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
package main
import (
"os"
"github.com/emicklei/proto"
)
type ProtoMessageMap map[string]*ProtoMessage
func BuildCurrentProtoMap(filename string) (ProtoMessageMap, error) {
if filename == "" {
return ProtoMessageMap{}, nil
}
reader, _ := os.Open(filename)
defer reader.Close()
parser := proto.NewParser(reader)
definition, _ := parser.Parse()
p := make(ProtoMessageMap)
proto.Walk(definition, proto.WithMessage(p.HandleMessage()))
return p, nil
}
func (p ProtoMessageMap) HandleMessage() func(m *proto.Message) {
return func(m *proto.Message) {
p[m.Name] = NewProtoMesssageFromMessage(m)
}
}
func (p ProtoMessageMap) GetFieldNum(messageName, fieldName string) int {
_, ok := p[messageName]
if !ok {
p[messageName] = &ProtoMessage{}
}
fieldNum := p[messageName].GetFieldNum(fieldName)
return fieldNum
}
func (p ProtoMessageMap) RemoveFieldNum(messageName, fieldName string) {
_, ok := p[messageName]
if !ok {
return
}
p[messageName].RemoveFieldNum(fieldName)
return
}
type ProtoMessage struct {
currMaxNum int
droppedNums []int
fields map[string]int
}
func NewProtoMesssageFromMessage(msg *proto.Message) *ProtoMessage {
fieldsMap := make(map[string]int, len(msg.Elements))
currMax := 0
for i, _ := range msg.Elements {
element := msg.Elements[i]
switch element.(type) {
case *proto.NormalField:
field := element.(*proto.NormalField)
fieldsMap[field.Name] = field.Sequence
if field.Sequence > currMax {
currMax = field.Sequence
}
case *proto.MapField:
field := element.(*proto.MapField)
fieldsMap[field.Name] = field.Sequence
if field.Sequence > currMax {
currMax = field.Sequence
}
default:
}
}
return &ProtoMessage{
currMaxNum: currMax,
fields: fieldsMap,
}
}
func (p *ProtoMessage) GetFieldNum(fieldName string) int {
if p.fields == nil {
p.fields = make(map[string]int)
}
_, ok := p.fields[fieldName]
if ok {
return p.fields[fieldName]
}
// assumes fields are dropped in order
if len(p.droppedNums) == 0 {
p.currMaxNum++
p.fields[fieldName] = p.currMaxNum
return p.fields[fieldName]
}
p.fields[fieldName] = p.droppedNums[0]
p.droppedNums = p.droppedNums[1:]
return p.fields[fieldName]
}
func (p *ProtoMessage) RemoveFieldNum(fieldName string) {
if p.fields == nil {
return
}
// assumes fields are dropped in order
_, ok := p.fields[fieldName]
if !ok {
return
}
p.droppedNums = append(p.droppedNums, p.fields[fieldName])
delete(p.fields, fieldName)
return
}