mirror of https://github.com/XTLS/Xray-core
58 lines
932 B
Go
58 lines
932 B
Go
package splithttp
|
|
|
|
import (
|
|
"io"
|
|
"sync"
|
|
)
|
|
|
|
type LazyReader struct {
|
|
readerSync sync.Mutex
|
|
CreateReader func() (io.ReadCloser, error)
|
|
reader io.ReadCloser
|
|
readerError error
|
|
}
|
|
|
|
func (r *LazyReader) getReader() (io.ReadCloser, error) {
|
|
r.readerSync.Lock()
|
|
defer r.readerSync.Unlock()
|
|
if r.reader != nil {
|
|
return r.reader, nil
|
|
}
|
|
|
|
if r.readerError != nil {
|
|
return nil, r.readerError
|
|
}
|
|
|
|
reader, err := r.CreateReader()
|
|
if err != nil {
|
|
r.readerError = err
|
|
return nil, err
|
|
}
|
|
|
|
r.reader = reader
|
|
return reader, nil
|
|
}
|
|
|
|
func (r *LazyReader) Read(b []byte) (int, error) {
|
|
reader, err := r.getReader()
|
|
if err != nil {
|
|
return 0, err
|
|
}
|
|
n, err := reader.Read(b)
|
|
return n, err
|
|
}
|
|
|
|
func (r *LazyReader) Close() error {
|
|
r.readerSync.Lock()
|
|
defer r.readerSync.Unlock()
|
|
|
|
var err error
|
|
if r.reader != nil {
|
|
err = r.reader.Close()
|
|
r.reader = nil
|
|
r.readerError = newError("closed reader")
|
|
}
|
|
|
|
return err
|
|
}
|