forked from itspage/go-platform
/
reader.go
64 lines (52 loc) · 1.08 KB
/
reader.go
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package config
import (
"encoding/json"
"errors"
"fmt"
"time"
"github.com/imdario/mergo"
hash "github.com/mitchellh/hashstructure"
)
type jsonReader struct{}
func (j *jsonReader) Parse(changes ...*ChangeSet) (*ChangeSet, error) {
var merged map[string]interface{}
for _, m := range changes {
if len(m.Data) == 0 {
m.Data = []byte(`{}`)
}
var data map[string]interface{}
if err := json.Unmarshal(m.Data, &data); err != nil {
return nil, err
}
if err := mergo.MapWithOverwrite(&merged, data); err != nil {
return nil, err
}
}
b, err := json.Marshal(merged)
if err != nil {
return nil, err
}
h, err := hash.Hash(merged, nil)
if err != nil {
return nil, err
}
return &ChangeSet{
Timestamp: time.Now(),
Data: b,
Checksum: fmt.Sprintf("%x", h),
Source: "json",
}, nil
}
func (j *jsonReader) Values(ch *ChangeSet) (Values, error) {
if ch == nil {
return nil, errors.New("changeset is nil")
}
return newValues(ch)
}
func (j *jsonReader) String() string {
return "json"
}
// New json reader
func NewReader() Reader {
return &jsonReader{}
}