forked from wallix/awless
/
defaults.go
111 lines (95 loc) · 2.26 KB
/
defaults.go
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/*
Copyright 2017 WALLIX
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.
*/
package database
import (
"bytes"
"encoding/gob"
"fmt"
"os"
)
const (
SyncAuto = "sync.auto"
RegionKey = "region"
InstanceTypeKey = "instance.type"
InstanceImageKey = "instance.image"
InstanceCountKey = "instance.count"
)
type defaults map[string]interface{}
func MustGetDefaultRegion() string {
db, close := MustGetCurrent()
defer close()
return db.MustGetDefaultRegion()
}
func (db *DB) MustGetDefaultRegion() string {
region, ok := db.GetDefaultString(RegionKey)
if !ok {
fmt.Fprintf(os.Stderr, "config: missing region. Set it with `awless config set region`\n")
os.Exit(-1)
}
return region
}
func (db *DB) GetDefaults() (defaults, error) {
d := make(defaults)
b, err := db.GetBytes(defaultsKey)
if err != nil {
return d, err
}
if len(b) == 0 {
return d, nil
}
dec := gob.NewDecoder(bytes.NewReader(b))
if err := dec.Decode(&d); err != nil {
return d, nil
}
return d, err
}
func (db *DB) SetDefault(k string, v interface{}) error {
d, err := db.GetDefaults()
if err != nil {
return err
}
d[k] = v
return db.saveDefaults(d)
}
func (db *DB) UnsetDefault(k string) error {
d, err := db.GetDefaults()
if err != nil {
return err
}
delete(d, k)
return db.saveDefaults(d)
}
func (db *DB) GetDefault(k string) (interface{}, bool) {
d, err := db.GetDefaults()
if err != nil {
return nil, false
}
i, ok := d[k]
return i, ok
}
func (db *DB) GetDefaultString(k string) (string, bool) {
v, ok := db.GetDefault(k)
if !ok {
return "", ok
}
str, ok := v.(string)
return str, ok
}
func (db *DB) saveDefaults(d defaults) error {
var buff bytes.Buffer
enc := gob.NewEncoder(&buff)
if err := enc.Encode(d); err != nil {
return err
}
return db.SetBytes(defaultsKey, buff.Bytes())
}