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reader.go
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reader.go
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// pakcage conf provide config helpers for ~/.zcn/config.yaml, ~/.zcn/network.yaml and ~/.zcn/wallet.json
package conf
import (
"encoding/json"
)
// Reader a config reader
type Reader interface {
GetString(key string) string
GetInt(key string) int
GetStringSlice(key string) []string
}
// JSONReader read config from json
type JSONReader struct {
items map[string]json.RawMessage
}
func (r *JSONReader) getRawMessage(key string) (json.RawMessage, bool) {
if r == nil || r.items == nil {
return nil, false
}
v, ok := r.items[key]
if !ok {
return nil, false
}
return v, true
}
// GetString read string from key
func (r *JSONReader) GetString(key string) string {
v, ok := r.getRawMessage(key)
if !ok {
return ""
}
var s string
err := json.Unmarshal(v, &s)
if err != nil {
return ""
}
return s
}
// GetInt read int from key
func (r *JSONReader) GetInt(key string) int {
v, ok := r.getRawMessage(key)
if !ok {
return 0
}
var i int
err := json.Unmarshal(v, &i)
if err != nil {
return 0
}
return i
}
// GetStringSlice get string slice from key
func (r *JSONReader) GetStringSlice(key string) []string {
v, ok := r.getRawMessage(key)
if !ok {
return nil
}
var list []string
err := json.Unmarshal(v, &list)
if err != nil {
return nil
}
return list
}
// NewReaderFromJSON create a JSONReader from json string
func NewReaderFromJSON(data string) (Reader, error) {
var items map[string]json.RawMessage
err := json.Unmarshal([]byte(data), &items)
if err != nil {
return nil, err
}
return &JSONReader{
items: items,
}, nil
}