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v2fly/infra/conf/loader.go
2019-02-10 19:04:11 +01:00

84 lines
1.8 KiB
Go

package conf
import (
"encoding/json"
"strings"
)
type ConfigCreator func() interface{}
type ConfigCreatorCache map[string]ConfigCreator
func (v ConfigCreatorCache) RegisterCreator(id string, creator ConfigCreator) error {
if _, found := v[id]; found {
return newError(id, " already registered.").AtError()
}
v[id] = creator
return nil
}
func (v ConfigCreatorCache) CreateConfig(id string) (interface{}, error) {
creator, found := v[id]
if !found {
return nil, newError("unknown config id: ", id)
}
return creator(), nil
}
type JSONConfigLoader struct {
cache ConfigCreatorCache
idKey string
configKey string
}
func NewJSONConfigLoader(cache ConfigCreatorCache, idKey string, configKey string) *JSONConfigLoader {
return &JSONConfigLoader{
idKey: idKey,
configKey: configKey,
cache: cache,
}
}
func (v *JSONConfigLoader) LoadWithID(raw []byte, id string) (interface{}, error) {
id = strings.ToLower(id)
config, err := v.cache.CreateConfig(id)
if err != nil {
return nil, err
}
if err := json.Unmarshal(raw, config); err != nil {
return nil, err
}
return config, nil
}
func (v *JSONConfigLoader) Load(raw []byte) (interface{}, string, error) {
var obj map[string]json.RawMessage
if err := json.Unmarshal(raw, &obj); err != nil {
return nil, "", err
}
rawID, found := obj[v.idKey]
if !found {
return nil, "", newError(v.idKey, " not found in JSON context").AtError()
}
var id string
if err := json.Unmarshal(rawID, &id); err != nil {
return nil, "", err
}
rawConfig := json.RawMessage(raw)
if len(v.configKey) > 0 {
configValue, found := obj[v.configKey]
if found {
rawConfig = configValue
} else {
// Default to empty json object.
rawConfig = json.RawMessage([]byte("{}"))
}
}
config, err := v.LoadWithID([]byte(rawConfig), id)
if err != nil {
return nil, id, err
}
return config, id, nil
}