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