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// Package circbufsync wraps armon/circbuf to be safe for concurrent
// read/write operations.
package circbufsync
import (
"sync"
"github.com/armon/circbuf"
)
// New creates a new synced circbuf.Buffer.
func New(buf *circbuf.Buffer) *Buffer {
return &Buffer{buf: buf}
}
// Buffer implements a subset of the *circbuf.Buffer methods where each
// exposed method is safe for concurrent read/write access.
type Buffer struct {
sync.Mutex
buf *circbuf.Buffer
}
// Bytes mimics circbuf.Write
func (b *Buffer) Write(p []byte) (int, error) {
b.Lock()
defer b.Unlock()
return b.buf.Write(p)
}
// Bytes mimics circbuf.Buffer
func (b *Buffer) Bytes() []byte {
b.Lock()
defer b.Unlock()
bs := b.buf.Bytes()
// We need to copy since Bytes MAY put us into an internal pointer.
// We have no way to detect this unfortunately so we have to copy every time.
result := make([]byte, len(bs))
copy(result, bs)
return result
}
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