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84 lines
1.9 KiB
84 lines
1.9 KiB
package conf
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import (
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"encoding/json"
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"v2ray.com/core/common/errors"
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)
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type ConfigCreator func() interface{}
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type ConfigCreatorCache map[string]ConfigCreator
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func (v ConfigCreatorCache) RegisterCreator(id string, creator ConfigCreator) error {
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if _, found := v[id]; found {
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return errors.New("Config: ", id, " already registered.")
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}
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v[id] = creator
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return nil
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}
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func (v ConfigCreatorCache) CreateConfig(id string) (interface{}, error) {
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creator, found := v[id]
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if !found {
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return nil, errors.New("Config: Unknown config id: ", id)
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}
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return creator(), nil
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}
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type JSONConfigLoader struct {
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cache ConfigCreatorCache
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idKey string
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configKey string
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}
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func NewJSONConfigLoader(cache ConfigCreatorCache, idKey string, configKey string) *JSONConfigLoader {
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return &JSONConfigLoader{
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idKey: idKey,
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configKey: configKey,
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cache: cache,
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}
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}
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func (v *JSONConfigLoader) LoadWithID(raw []byte, id string) (interface{}, error) {
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creator, found := v.cache[id]
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if !found {
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return nil, errors.New("Config: Unknown config id: ", id)
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}
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config := creator()
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if err := json.Unmarshal(raw, config); err != nil {
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return nil, err
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}
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return config, nil
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}
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func (v *JSONConfigLoader) Load(raw []byte) (interface{}, string, error) {
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var obj map[string]json.RawMessage
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if err := json.Unmarshal(raw, &obj); err != nil {
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return nil, "", err
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}
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rawID, found := obj[v.idKey]
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if !found {
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return nil, "", errors.New("Config: ", v.idKey, " not found in JSON context.")
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}
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var id string
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if err := json.Unmarshal(rawID, &id); err != nil {
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return nil, "", err
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}
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rawConfig := json.RawMessage(raw)
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if len(v.configKey) > 0 {
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configValue, found := obj[v.configKey]
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if !found {
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return nil, "", errors.New("Config: ", v.configKey, " not found in JSON content.")
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}
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rawConfig = configValue
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}
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config, err := v.LoadWithID([]byte(rawConfig), id)
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if err != nil {
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return nil, id, err
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}
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return config, id, nil
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}
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