forked from kelseyhightower/confidence
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathconfig.go
More file actions
239 lines (216 loc) · 5.07 KB
/
config.go
File metadata and controls
239 lines (216 loc) · 5.07 KB
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
package main
import (
"encoding/json"
"flag"
"fmt"
"log"
"os"
"strings"
"time"
etcd "github.com/coreos/etcd/client"
vault "github.com/hashicorp/vault/api"
"golang.org/x/net/context"
)
var (
username string
password string
listenAddr string
tlsCert string
tlsKey string
etcdAddr string
vaultAddr string
vaultToken string
)
var (
defaultEtcdAddr = "http://127.0.0.1:2379"
defaultVaultAddr = "http://127.0.0.1:8200"
defaultListenAddr = "127.0.0.1:443"
defaultTLSCert = "/etc/app/ssl/cert.pem"
defaultTLSKey = "/etc/app/ssl/key.pem"
)
var configKeys = []string{
"username",
"password",
"listen_addr",
"tls_cert",
"tls_key",
"etcd_addr",
"vault_addr",
"vault_token",
}
func init() {
flag.StringVar(&username, "username", "", "Username.")
flag.StringVar(&password, "password", "", "Password.")
flag.StringVar(&listenAddr, "listen-addr", defaultListenAddr, "Listen address.")
flag.StringVar(&tlsCert, "tls-cert", defaultTLSCert, "TSL server cert.")
flag.StringVar(&tlsKey, "tls-key", defaultTLSKey, "TSL server key.")
flag.StringVar(&etcdAddr, "etcd-addr", defaultEtcdAddr, "etcd address.")
flag.StringVar(&vaultAddr, "vault-addr", defaultVaultAddr, "vault address.")
flag.StringVar(&vaultToken, "vault-token", "", "vault token.")
}
type Config struct {
Username string `json:"username"`
Password string `json:"password"`
ListenAddr string `json:"listen_addr"`
TLSCert string `json:"tls_cert"`
TLSKey string `json:"tls_key"`
EtcdAddr string `json:"etcd_addr"`
VaultAddr string `json:"vault_addr"`
VaultToken string `json:"vault_token"`
}
func ConfigFromFile(path string) (Config, error) {
c := Config{}
f, err := os.Open(path)
if os.IsNotExist(err) {
log.Println("config file does not exist")
return c, nil
}
if err != nil {
return c, err
}
if err := json.NewDecoder(f).Decode(&c); err != nil {
return c, err
}
return c, nil
}
func ConfigFromEnv() Config {
return Config{
Username: os.Getenv("APP_USERNAME"),
Password: os.Getenv("APP_PASSWORD"),
ListenAddr: os.Getenv("APP_LISTEN_ADDR"),
TLSCert: os.Getenv("APP_TLS_CERT"),
TLSKey: os.Getenv("APP_TLS_KEY"),
EtcdAddr: os.Getenv("APP_ETCD_ADDR"),
VaultAddr: os.Getenv("APP_VAULT_ADDR"),
VaultToken: os.Getenv("APP_VAULT_TOKEN"),
}
}
func ConfigFromFlags() Config {
return Config{
Username: username,
Password: password,
ListenAddr: listenAddr,
TLSCert: tlsCert,
TLSKey: tlsKey,
EtcdAddr: etcdAddr,
VaultAddr: vaultAddr,
VaultToken: vaultToken,
}
}
func ConfigFromEtcd(addr string) (Config, error) {
c := Config{}
cfg := etcd.Config{
Endpoints: []string{addr},
Transport: etcd.DefaultTransport,
HeaderTimeoutPerRequest: time.Second,
}
client, err := etcd.New(cfg)
if err != nil {
return c, err
}
kapi := etcd.NewKeysAPI(client)
return walk(configKeys, func(key string) (string, error) {
key = fmt.Sprintf("/app/%s", key)
resp, err := kapi.Get(context.Background(), key, nil)
if isKeyNotExist(err) {
return "", nil
}
if err != nil {
return "", err
}
return resp.Node.Value, nil
})
}
func ConfigFromVault(addr, token string) (Config, error) {
var c Config
vfg := vault.DefaultConfig()
vfg.Address = addr
vc, err := vault.NewClient(vfg)
if err != nil {
return c, err
}
vc.SetToken(token)
return walk(configKeys, func(key string) (string, error) {
key = fmt.Sprintf("secret/%s", key)
secret, err := vc.Logical().Read(key)
if err != nil {
return "", err
}
if secret != nil {
return secret.Data["value"].(string), nil
}
return "", nil
})
}
func walk(keys []string, walkFn WalkFunc) (Config, error) {
c := Config{}
for _, key := range keys {
value, err := walkFn(key)
if err != nil {
return c, err
}
switch key {
case "username":
c.Username = value
case "password":
c.Password = value
case "listenaddr":
c.ListenAddr = value
case "tlscert":
c.TLSCert = value
case "tlskey":
c.TLSKey = value
}
}
return c, nil
}
type WalkFunc func(key string) (string, error)
func isKeyNotExist(err error) bool {
if err == nil {
return false
}
return strings.HasPrefix(err.Error(), "100: Key not found")
}
func NewConfig() *Config {
return &Config{
ListenAddr: defaultListenAddr,
TLSCert: defaultTLSCert,
TLSKey: defaultTLSKey,
}
}
func (c *Config) Override(src Config) {
if src.Username != "" {
c.Username = src.Username
}
if src.Password != "" {
c.Password = src.Password
}
if src.ListenAddr != "" {
c.ListenAddr = src.ListenAddr
}
if src.TLSCert != "" {
c.TLSCert = src.TLSCert
}
if src.TLSKey != "" {
c.TLSKey = src.TLSKey
}
if src.EtcdAddr != "" {
c.EtcdAddr = src.EtcdAddr
}
if src.VaultAddr != "" {
c.VaultAddr = src.VaultAddr
}
if src.VaultToken != "" {
c.VaultToken = src.VaultToken
}
}
var configTemplate = ` Username: %s
Password: %s
ListenAddr: %s
TLSCert: %s
TLSKey: %s
EtcdAddr: %s
VaultAddr: %s`
func (c *Config) String() string {
return fmt.Sprintf(configTemplate, c.Username, c.Password, c.ListenAddr, c.TLSCert, c.TLSKey, c.EtcdAddr, c.VaultAddr)
}