-
Notifications
You must be signed in to change notification settings - Fork 13
/
template.go
161 lines (130 loc) · 4.39 KB
/
template.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
/*
Copyright 2015 The Kubernetes Authors All rights reserved.
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.
*/
/**
* Copyright 2016, Z Lab Corporation. All rights reserved.
* Copyright 2017, nghttpx Ingress controller contributors
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
package nghttpx
import (
"bytes"
"context"
_ "embed"
"encoding/hex"
"fmt"
"text/template"
"time"
"k8s.io/klog/v2"
)
var (
funcMap = template.FuncMap{
"duration": func(d time.Duration) string {
return nghttpxDuration(d)
},
"encodeHex": func(b []byte) string {
return hex.EncodeToString(b)
},
}
)
var (
//go:embed nghttpx.tmpl
nghttpxTmpl string
//go:embed nghttpx-backend.tmpl
nghttpxBackendTmpl string
//go:embed default.tmpl
defaultTmpl string
)
func (lb *LoadBalancer) loadTemplate() {
lb.template = template.Must(template.New("nghttpx.tmpl").Funcs(funcMap).Parse(nghttpxTmpl))
lb.backendTemplate = template.Must(template.New("nghttpx-backend.tmpl").Funcs(funcMap).Parse(nghttpxBackendTmpl))
}
// configStatus is the status of configuration files.
type configStatus int
const (
// configuration has not changed
configNotChanged configStatus = iota
// main configuration has changed
mainConfigChanged
// only backend configuration has changed
backendConfigChanged
)
// generateCfg generates nghttpx's main and backend configurations.
func (lb *LoadBalancer) generateCfg(ctx context.Context, ingConfig *IngressConfig) ([]byte, []byte, error) {
log := klog.FromContext(ctx)
mainConfigBuffer := new(bytes.Buffer)
if err := lb.template.Execute(mainConfigBuffer, ingConfig); err != nil {
log.Error(err, "nghttpx error while executing main configuration template")
return nil, nil, err
}
backendConfigBuffer := new(bytes.Buffer)
if err := lb.backendTemplate.Execute(backendConfigBuffer, ingConfig); err != nil {
log.Error(err, "nghttpx error while executing backend configuration template")
return nil, nil, err
}
return mainConfigBuffer.Bytes(), backendConfigBuffer.Bytes(), nil
}
func (lb *LoadBalancer) checkAndWriteCfg(ctx context.Context, ingConfig *IngressConfig, mainConfig, backendConfig []byte) (configStatus, error) {
configPath := ConfigPath(ingConfig.ConfDir)
backendConfigPath := BackendConfigPath(ingConfig.ConfDir)
if err := MkdirAll(ingConfig.ConfDir); err != nil {
return configNotChanged, err
}
// If main configuration has changed, we need to reload nghttpx
mainChanged, err := needsReload(ctx, configPath, mainConfig)
if err != nil {
return configNotChanged, err
}
// If backend configuration has changed, we need to issue
// backend replace API to nghttpx
backendChanged, err := needsReload(ctx, backendConfigPath, backendConfig)
if err != nil {
return configNotChanged, err
}
if mainChanged {
if err := WriteFile(configPath, mainConfig); err != nil {
return configNotChanged, err
}
}
if backendChanged {
if err := WriteFile(backendConfigPath, backendConfig); err != nil {
return configNotChanged, err
}
}
if mainChanged {
return mainConfigChanged, nil
}
if backendChanged {
return backendConfigChanged, nil
}
return configNotChanged, nil
}
// writeDefaultNghttpxConfig writes default configuration file for nghttpx.
func (lb *LoadBalancer) writeDefaultNghttpxConfig(nghttpxConfDir string, nghttpxHealthPort, nghttpxAPIPort int32) error {
if err := MkdirAll(nghttpxConfDir); err != nil {
return err
}
var buf bytes.Buffer
t := template.Must(template.New("default.tmpl").Parse(defaultTmpl))
if err := t.Execute(&buf, map[string]interface{}{
"HealthPort": nghttpxHealthPort,
"APIPort": nghttpxAPIPort,
}); err != nil {
return fmt.Errorf("unable to not create default configuration file for nghttpx: %w", err)
}
if err := WriteFile(ConfigPath(nghttpxConfDir), buf.Bytes()); err != nil {
return fmt.Errorf("unable to write default configuration file for nghttpx: %w", err)
}
return nil
}