/
reader.go
107 lines (97 loc) · 2 KB
/
reader.go
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package config
import (
"fmt"
"strings"
_ "github.com/go-kratos/kratos/v2/encoding/json"
"github.com/imdario/mergo"
)
// Reader is config reader.
type Reader interface {
Merge(...*KeyValue) error
Value(string) (Value, bool)
Source() ([]byte, error)
}
type reader struct {
opts options
values map[string]interface{}
}
func newReader(opts options) Reader {
return &reader{
opts: opts,
values: make(map[string]interface{}),
}
}
func (r *reader) Merge(kvs ...*KeyValue) error {
merged, err := cloneMap(r.values)
if err != nil {
return err
}
for _, kv := range kvs {
next := make(map[string]interface{})
if err := r.opts.decoder(kv, next); err != nil {
return err
}
if err := mergo.Map(&merged, convertMap(next), mergo.WithOverride); err != nil {
return err
}
}
r.values = merged
return nil
}
func (r *reader) Value(path string) (Value, bool) {
var (
next = r.values
keys = strings.Split(path, ".")
last = len(keys) - 1
)
for idx, key := range keys {
value, ok := next[key]
if !ok {
return nil, false
}
if idx == last {
av := &atomicValue{}
av.Store(value)
return av, true
}
switch vm := value.(type) {
case map[string]interface{}:
next = vm
default:
return nil, false
}
}
return nil, false
}
func (r *reader) Source() ([]byte, error) {
return codec.Marshal(r.values)
}
func cloneMap(src map[string]interface{}) (map[string]interface{}, error) {
data, err := codec.Marshal(src)
if err != nil {
return nil, err
}
dst := make(map[string]interface{})
if err = codec.Unmarshal(data, &dst); err != nil {
return nil, err
}
return dst, nil
}
func convertMap(src interface{}) interface{} {
switch m := src.(type) {
case map[string]interface{}:
dst := make(map[string]interface{}, len(m))
for k, v := range m {
dst[k] = convertMap(v)
}
return dst
case map[interface{}]interface{}:
dst := make(map[string]interface{}, len(m))
for k, v := range m {
dst[fmt.Sprint(k)] = convertMap(v)
}
return dst
default:
return src
}
}