-
Notifications
You must be signed in to change notification settings - Fork 324
/
yaml.go
270 lines (224 loc) · 9.23 KB
/
yaml.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
264
265
266
267
268
269
270
// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of Tetragon
package eventchecker
import (
"fmt"
"strings"
"github.com/cilium/tetragon/tools/protoc-gen-go-tetragon/common"
"github.com/iancoleman/strcase"
"google.golang.org/protobuf/compiler/protogen"
)
// Generate generates boilerplate code for the eventchecker spec
func generateEventCheckerSpec(g *protogen.GeneratedFile, f []*protogen.File) error {
events, err := getEvents(f)
if err != nil {
return err
}
eventCheckerInterface := common.GeneratedIdent(g, "eventchecker", "EventChecker")
unmarshalStrict := common.GoIdent(g, "sigs.k8s.io/yaml", "UnmarshalStrict")
jsonMarshal := common.GoIdent(g, "encoding/json", "Marshal")
g.P(`type eventCheckerHelper struct {`)
for _, event := range events {
jsonName := strcase.ToLowerCamel(strings.TrimPrefix(event.GoIdent.GoName, "Process"))
checkerIdent := common.GeneratedIdent(g, "eventchecker", event.checkerName(g))
g.P(event.GoIdent.GoName + `*` + checkerIdent +
common.StructTag(fmt.Sprintf("json:\"%s,omitempty\"", jsonName)))
}
g.P(`}`)
g.P(`// EventChecker is a wrapper around the EventChecker interface to help unmarshaling
type EventChecker struct {
` + eventCheckerInterface + `
}`)
g.P(`// UnmarshalJSON implements the json.Unmarshaler interface
func (checker *EventChecker) UnmarshalJSON(b []byte) error {
var eventChecker ` + eventCheckerInterface + `
var helper eventCheckerHelper
if err := ` + unmarshalStrict + `(b, &helper); err != nil {
return err
}`)
for _, event := range events {
g.P(`if helper.` + event.GoIdent.GoName + ` != nil {
if eventChecker != nil {
return ` + common.FmtErrorf(g, "EventChecker: cannot define more than one checker, got %T but already had %T", "helper."+event.GoIdent.GoName, "eventChecker") + `
}
eventChecker = helper.` + event.GoIdent.GoName + `
}`)
}
g.P(`checker.EventChecker = eventChecker
return nil
}`)
g.P(`// MarshalJSON implements the json.Marshaler interface
func (checker EventChecker) MarshalJSON() ([]byte, error) {
var helper eventCheckerHelper
switch c := checker.EventChecker.(type) {`)
for _, event := range events {
checkerIdent := common.GeneratedIdent(g, "eventchecker", event.checkerName(g))
g.P(`case *` + checkerIdent + `:
helper.` + event.GoIdent.GoName + ` = c`)
}
g.P(`default:
return nil, ` + common.FmtErrorf(g, "EventChecker: unknown checker type %T", "c") + `
}
return ` + jsonMarshal + `(helper)
}`)
return nil
}
// Generate generates boilerplate code for the multi eventchecker spec
func generateMultiEventCheckerSpec(g *protogen.GeneratedFile) error {
g.P(`// MultiEventCheckerSpec is a YAML spec to define a MultiEventChecker
type MultiEventCheckerSpec struct {
Ordered bool ` + common.StructTag("json:\"ordered\"") + `
Checks []EventChecker ` + common.StructTag("json:\"checks\"") + `
}`)
eventCheckerInterface := common.GeneratedIdent(g, "eventchecker", "EventChecker")
multiEventCheckerInterface := common.GeneratedIdent(g, "eventchecker", "MultiEventChecker")
newOrderedEventChecker := common.GeneratedIdent(g, "eventchecker", "NewOrderedEventChecker")
newUnorderedEventChecker := common.GeneratedIdent(g, "eventchecker", "NewUnorderedEventChecker")
orderedEventChecker := common.GeneratedIdent(g, "eventchecker", "OrderedEventChecker")
unorderedEventChecker := common.GeneratedIdent(g, "eventchecker", "UnorderedEventChecker")
// Codegen the IntoMultiEventChecker method
g.P(`// IntoMultiEventChecker coerces an event checker from this spec
func (spec *MultiEventCheckerSpec) IntoMultiEventChecker() (` + multiEventCheckerInterface + `, error) {
var checkers []` + eventCheckerInterface + `
for _, check := range spec.Checks {
checkers = append(checkers, check.EventChecker)
}
if spec.Ordered {
return ` + newOrderedEventChecker + `(checkers...), nil
}
return ` + newUnorderedEventChecker + `(checkers...), nil
}`)
// Codegen the SpecFromMultiEventChecker method
g.P(`// SpecFromMultiEventChecker coerces a spec from a MultiEventChecker
func SpecFromMultiEventChecker(checker_ ` + multiEventCheckerInterface + `) (*MultiEventCheckerSpec, error) {
var spec MultiEventCheckerSpec
checker, ok := checker_.(interface{ GetChecks() []` + eventCheckerInterface + `})
if !ok {
return nil, ` + common.FmtErrorf(g, "Unhandled checker type %T", "checker_") + `
}
for _, check := range checker.GetChecks() {
spec.Checks = append(spec.Checks, EventChecker{check})
}
switch checker.(type) {
case *` + orderedEventChecker + `:
spec.Ordered = true
case *` + unorderedEventChecker + `:
spec.Ordered = false
default:
return nil, ` + common.FmtErrorf(g, "Unhandled checker type %T", "checker") + `
}
return &spec, nil
}`)
return nil
}
func generateEventCheckerConf(g *protogen.GeneratedFile) error {
g.P(`// Metadata contains metadata for the eventchecker definition
type Metadata struct {
Name string ` + common.StructTag(`json:"name"`) + `
Description string ` + common.StructTag(`json:"description"`) + `
}`)
g.P(`// Metadata contains metadata for the eventchecker definition
type EventCheckerConf struct {
APIVersion string ` + common.StructTag(`json:"apiVersion"`) + `
Kind string ` + common.StructTag(`json:"kind"`) + `
Metadata Metadata ` + common.StructTag(`json:"metadata"`) + `
Spec MultiEventCheckerSpec ` + common.StructTag(`json:"spec"`) + `
}`)
yamlUnmarshal := common.GoIdent(g, "sigs.k8s.io/yaml", "UnmarshalStrict")
yamlMarshal := common.GoIdent(g, "sigs.k8s.io/yaml", "Marshal")
template := common.GoIdent(g, "text/template", "New")
osWriteFile := common.GoIdent(g, "os", "WriteFile")
osReadFile := common.GoIdent(g, "os", "ReadFile")
bytesBuffer := common.GoIdent(g, "bytes", "Buffer")
g.P(`// ConfFromSpec creates a new EventCheckerConf from a MultiEventCheckerSpec
func ConfFromSpec(apiVersion, name, description string,
spec *MultiEventCheckerSpec) (*EventCheckerConf, error) {
if spec == nil {
return nil, ` + common.FmtErrorf(g, "spec is nil") + `
}
return &EventCheckerConf{
APIVersion: apiVersion,
Kind: "EventChecker",
Metadata: Metadata{
Name: name,
Description: description,
},
Spec: *spec,
}, nil
}
// ConfFromChecker creates a new EventCheckerConf from a MultiEventChecker
func ConfFromChecker(apiVersion, name, description string,
checker eventchecker.MultiEventChecker) (*EventCheckerConf, error) {
spec, err := SpecFromMultiEventChecker(checker)
if err != nil {
return nil, err
}
return &EventCheckerConf{
APIVersion: apiVersion,
Kind: "EventChecker",
Metadata: Metadata{
Name: name,
Description: description,
},
Spec: *spec,
}, nil
}
// ReadYaml reads an event checker from yaml
func ReadYaml(data string) (*EventCheckerConf, error) {
var conf EventCheckerConf
err := ` + yamlUnmarshal + `([]byte(data), &conf)
if err != nil {
return nil, err
}
return &conf, nil
}
// ReadYamlFile reads an event checker from a yaml file
func ReadYamlFile(file string) (*EventCheckerConf, error) {
data, err := ` + osReadFile + `(file)
if err != nil {
return nil, err
}
return ReadYaml(string(data))
}
// ReadYamlTemplate reads an event checker template from yaml
func ReadYamlTemplate(text string, data interface{}) (*EventCheckerConf, error) {
var conf EventCheckerConf
templ := ` + template + `("checkerYaml")
templ, err := templ.Parse(text)
if err != nil {
return nil, err
}
var buf ` + bytesBuffer + `
templ.Execute(&buf, data)
err = ` + yamlUnmarshal + `(buf.Bytes(), &conf)
if err != nil {
return nil, err
}
return &conf, nil
}
// ReadYamlFileTemplate reads an event checker template from yaml
func ReadYamlFileTemplate(file string, data interface{}) (*EventCheckerConf, error) {
text, err := ` + osReadFile + `(file)
if err != nil {
return nil, err
}
return ReadYamlTemplate(string(text), data)
}
// WriteYaml writes an event checker to yaml
func (conf *EventCheckerConf) WriteYaml() (string, error) {
data, err := ` + yamlMarshal + `(conf)
if err != nil {
return "", err
}
return string(data), nil
}
// WriteYamlFile writes an event checker to a yaml file
func (conf *EventCheckerConf) WriteYamlFile(file string) error {
data, err := conf.WriteYaml()
if err != nil {
return err
}
return ` + osWriteFile + `(file, []byte(data), 0o644)
}`)
return nil
}