cloudflared-mirror/h2mux/shared_buffer.go

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package h2mux
import (
"bytes"
"io"
"sync"
)
type SharedBuffer struct {
cond *sync.Cond
buffer bytes.Buffer
eof bool
}
func NewSharedBuffer() *SharedBuffer {
return &SharedBuffer{
cond: sync.NewCond(&sync.Mutex{}),
}
}
func (s *SharedBuffer) Read(p []byte) (n int, err error) {
totalRead := 0
s.cond.L.Lock()
for totalRead == 0 {
n, err = s.buffer.Read(p[totalRead:])
totalRead += n
if err == io.EOF {
if s.eof {
break
}
err = nil
if n > 0 {
break
}
s.cond.Wait()
}
}
s.cond.L.Unlock()
return totalRead, err
}
func (s *SharedBuffer) Write(p []byte) (n int, err error) {
s.cond.L.Lock()
defer s.cond.L.Unlock()
if s.eof {
return 0, io.EOF
}
n, err = s.buffer.Write(p)
s.cond.Signal()
return
}
func (s *SharedBuffer) Close() error {
s.cond.L.Lock()
defer s.cond.L.Unlock()
if !s.eof {
s.eof = true
s.cond.Signal()
}
return nil
}
func (s *SharedBuffer) Closed() bool {
s.cond.L.Lock()
defer s.cond.L.Unlock()
return s.eof
}