/
merger_base.go
105 lines (96 loc) · 2.49 KB
/
merger_base.go
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package mergers
import (
"fmt"
"io"
"io/ioutil"
"github.com/v2fly/v2ray-core/v4/common/cmdarg"
"github.com/v2fly/v2ray-core/v4/infra/conf/merge"
)
type jsonConverter func(v []byte) ([]byte, error)
// makeMerger makes a merger who merge the format by converting it to JSON
func makeMerger(name string, extensions []string, converter jsonConverter) *Merger {
return &Merger{
Name: name,
Extensions: extensions,
Merge: makeToJSONMergeFunc(converter),
}
}
// makeToJSONMergeFunc makes a merge func who merge the format by converting it to JSON
func makeToJSONMergeFunc(converter func(v []byte) ([]byte, error)) MergeFunc {
return func(input interface{}, target map[string]interface{}) error {
if target == nil {
panic("merge target is nil")
}
switch v := input.(type) {
case string:
err := loadFile(v, target, converter)
if err != nil {
return err
}
case []string:
err := loadFiles(v, target, converter)
if err != nil {
return err
}
case cmdarg.Arg:
err := loadFiles(v, target, converter)
if err != nil {
return err
}
case []byte:
err := loadBytes(v, target, converter)
if err != nil {
return err
}
case io.Reader:
err := loadReader(v, target, converter)
if err != nil {
return err
}
default:
return newError("unknow merge input type")
}
return nil
}
}
func loadFiles(files []string, target map[string]interface{}, converter func(v []byte) ([]byte, error)) error {
for _, file := range files {
err := loadFile(file, target, converter)
if err != nil {
return err
}
}
return nil
}
func loadFile(file string, target map[string]interface{}, converter func(v []byte) ([]byte, error)) error {
bs, err := cmdarg.LoadArgToBytes(file)
if err != nil {
return fmt.Errorf("fail to load %s: %s", file, err)
}
if converter != nil {
bs, err = converter(bs)
if err != nil {
return fmt.Errorf("error convert to json '%s': %s", file, err)
}
}
_, err = merge.ToMap(bs, target)
return err
}
func loadReader(reader io.Reader, target map[string]interface{}, converter func(v []byte) ([]byte, error)) error {
bs, err := io.ReadAll(reader)
if err != nil {
return err
}
return loadBytes(bs, target, converter)
}
func loadBytes(bs []byte, target map[string]interface{}, converter func(v []byte) ([]byte, error)) error {
var err error
if converter != nil {
bs, err = converter(bs)
if err != nil {
return fmt.Errorf("fail to convert to json: %s", err)
}
}
_, err = merge.ToMap(bs, target)
return err
}