/
util.go
263 lines (228 loc) · 5.96 KB
/
util.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
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
package main
import (
"bytes"
"errors"
"fmt"
stdpath "path"
"sort"
"strings"
gnmipb "github.com/nileshsimaria/jtimon/gnmi"
)
//PathType of gnmi
type PathType int64
const (
//StructuredPath of gnmi
StructuredPath PathType = iota
//StringSlicePath of gnmi
StringSlicePath
)
//PathToString - convert gnmi path to string
func PathToString(path *gnmipb.Path) (string, error) {
s, err := PathToStrings(path)
return "/" + stdpath.Join(s...), err
}
//PathToStrings -- convert gnmi Path to []string
func PathToStrings(path *gnmipb.Path) ([]string, error) {
var p []string
if path.Element != nil {
for i, e := range path.Element {
if e == "" {
return nil, fmt.Errorf("empty element at index %d in %v", i, path.Element)
}
p = append(p, e)
}
return p, nil
}
for i, e := range path.Elem {
if e.Name == "" {
return nil, fmt.Errorf("empty name for PathElem at index %d", i)
}
elem, err := elemToString(e.Name, e.Key)
if err != nil {
return nil, fmt.Errorf("failed formatting PathElem at index %d: %v", i, err)
}
p = append(p, elem)
}
return p, nil
}
func elemToString(name string, kv map[string]string) (string, error) {
if name == "" {
return "", errors.New("empty name for PathElem")
}
if len(kv) == 0 {
return name, nil
}
var keys []string
for k, v := range kv {
if k == "" {
return "", fmt.Errorf("empty key name (value: %s) in element %s", v, name)
}
keys = append(keys, k)
}
sort.Strings(keys)
for _, k := range keys {
v := strings.Replace(kv[k], `=`, `\=`, -1)
v = strings.Replace(v, `]`, `\]`, -1)
name = fmt.Sprintf("%s[%s=%s]", name, k, v)
}
return name, nil
}
// StringToPath - convert string into gnmi path
func StringToPath(path string, pathTypes ...PathType) (*gnmipb.Path, error) {
var errs Errors
if len(pathTypes) == 0 {
return nil, AppendErr(errs, errors.New("no path types specified"))
}
pmsg := &gnmipb.Path{}
for _, p := range pathTypes {
switch p {
case StructuredPath:
gp, err := StringToStructuredPath(path)
if err != nil {
errs = AppendErr(errs, fmt.Errorf("error building structured path: %v", err))
continue
}
pmsg.Elem = gp.Elem
case StringSlicePath:
gp, err := StringToStringSlicePath(path)
if err != nil {
errs = AppendErr(errs, fmt.Errorf("error building string slice path: %v", err))
continue
}
pmsg.Element = gp.Element
}
}
if errs != nil {
return nil, errs
}
return pmsg, nil
}
// StringToStringSlicePath - convert path to gnmi path
func StringToStringSlicePath(path string) (*gnmipb.Path, error) {
parts := pathStringToElements(path)
gpath := new(gnmipb.Path)
for _, p := range parts {
name, kv, err := extractKV(p)
if err != nil {
return nil, fmt.Errorf("error parsing path %q: %v", path, err)
}
fpath, err := elemToString(name, kv)
if err != nil {
return nil, fmt.Errorf("error formatting path %q: %v", path, err)
}
gpath.Element = append(gpath.Element, fpath)
}
return gpath, nil
}
// StringToStructuredPath - convert string into gnmi structured path
func StringToStructuredPath(path string) (*gnmipb.Path, error) {
parts := pathStringToElements(path)
gpath := &gnmipb.Path{}
for _, p := range parts {
name, kv, err := extractKV(p)
if err != nil {
return nil, fmt.Errorf("error parsing path %s: %v", path, err)
}
gpath.Elem = append(gpath.Elem, &gnmipb.PathElem{
Name: name,
Key: kv,
})
}
return gpath, nil
}
func pathStringToElements(s string) []string {
var parts []string
var buf bytes.Buffer
var inKey, inEscape bool
for _, ch := range s {
switch {
case ch == '[' && !inEscape:
inKey = true
case ch == ']' && !inEscape:
inKey = false
case ch == '\\' && !inEscape && !inKey:
inEscape = true
continue
case ch == '/' && !inEscape && !inKey:
parts = append(parts, buf.String())
buf.Reset()
continue
}
buf.WriteRune(ch)
inEscape = false
}
if buf.Len() != 0 {
parts = append(parts, buf.String())
}
if len(parts) > 0 && parts[0] == "" {
parts = parts[1:]
}
return parts
}
func extractKV(in string) (string, map[string]string, error) {
var inEscape, inKey, inValue bool
var name, currentKey string
var buf bytes.Buffer
keys := map[string]string{}
for _, ch := range in {
switch {
case ch == '[' && !inEscape && !inValue && inKey:
return "", nil, fmt.Errorf("received an unescaped [ in key of element %s", name)
case ch == '[' && !inEscape && !inKey:
inKey = true
if len(keys) == 0 {
if buf.Len() == 0 {
return "", nil, errors.New("received a value when the element name was null")
}
name = buf.String()
buf.Reset()
}
continue
case ch == ']' && !inEscape && !inKey:
return "", nil, fmt.Errorf("received an unescaped ] when not in a key for element %s", buf.String())
case ch == ']' && !inEscape:
inKey = false
inValue = false
if err := addKey(keys, name, currentKey, buf.String()); err != nil {
return "", nil, err
}
buf.Reset()
currentKey = ""
continue
case ch == '\\' && !inEscape:
inEscape = true
continue
case ch == '=' && inKey && !inEscape && !inValue:
currentKey = buf.String()
buf.Reset()
inValue = true
continue
}
buf.WriteRune(ch)
inEscape = false
}
if len(keys) == 0 {
name = buf.String()
}
if len(keys) != 0 && buf.Len() != 0 {
return "", nil, fmt.Errorf("trailing garbage following keys in element %s, got: %v", name, buf.String())
}
if strings.Contains(name, " ") {
return "", nil, fmt.Errorf("invalid space character included in element name '%s'", name)
}
return name, keys, nil
}
func addKey(keys map[string]string, e, k, v string) error {
switch {
case strings.Contains(k, " "):
return fmt.Errorf("received an invalid space in element %s key name '%s'", e, k)
case e == "":
return fmt.Errorf("received null element value with key and value %s=%s", k, v)
case k == "":
return fmt.Errorf("received null key name for element %s", e)
case v == "":
return fmt.Errorf("received null value for key %s of element %s", k, e)
}
keys[k] = v
return nil
}