/
stream.go
64 lines (55 loc) · 947 Bytes
/
stream.go
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package chunker
import (
"io"
"sync"
)
// Stream implements io.Reader.
type Stream struct {
recv chan []byte
done chan struct{}
m sync.Mutex
data []byte
i int64
}
// NewStream returns a new stream.
func NewStream() *Stream {
return &Stream{
recv: make(chan []byte),
done: make(chan struct{}, 1),
}
}
// Provide provides data for Read.
func (s *Stream) Provide(data []byte) {
s.recv <- data
}
// Read puts data into p.
func (s *Stream) Read(p []byte) (n int, err error) {
if s.i >= int64(len(s.data)) {
for {
select {
case <-s.done:
return 0, io.EOF
case data := <-s.recv:
if err != nil {
return 0, err
}
s.data = data
s.i = 0
return s.Read(p)
}
}
}
n = copy(p, s.data[s.i:])
s.i += int64(n)
return n, nil
}
// Close closes reader.
func (s *Stream) Close() error {
s.m.Lock()
defer s.m.Unlock()
if s.done == nil {
return nil
}
s.done <- struct{}{}
return nil
}