Improve handling of buffer size in Go client

clients/go/pipeio/pipeio.go

@@ -2,9 +2,12 @@ package pipeio
 
 import (
 	"os"
+	"io"
 	"bufio"
 )
 
+const defaultBufSize = 65536
+
 
 type pipeReader struct {
 	pipe *os.File
@@ -21,6 +24,7 @@ func NewPipeReader(pipePath string) (*pipeReader, error) {
 	if err != nil {
 		return nil, err
 	}
+	scanner.Buffer(make([]byte, defaultBufSize), defaultBufSize)
 	return &pipeReader{
 		pipe: pipe,
 		scanner: scanner,
@@ -50,9 +54,16 @@ func (preader *pipeReader) RecvMessage() []byte {
 	if preader.scanner.Scan() {
 		return preader.scanner.Bytes()
 	}
+	if err := preader.scanner.Err(); err != io.EOF {
+		panic(err)
+	}
 	return nil
 }
 
+func (preader *pipeReader) BufSize(size int) {
+	preader.scanner.Buffer(make([]byte, size), size)
+}
+
 
 type pipeWriter struct {
 	pipe *os.File