[cleanup] remove unused file

Signed-off-by: Leo Chen <leo@harmony.one>

p2p/helper.go

@@ -1,65 +0,0 @@
-package p2p
-
-import (
-	"bufio"
-	"encoding/binary"
-	"io"
-	"time"
-
-	"github.com/ethereum/go-ethereum/log"
-)
-
-/*
-P2p Message data structure:
-
----- message start -----
-1 byte            - p2p type
-                    0x00: unicast (no need to forward)
-                    0x01: broadcast (may need to forward to other neighbors)
-4 bytes           - message content size n in number of bytes
-content (n bytes) - actual message content
-----  message end  -----
-
-
-*/
-
-// BatchSizeInByte defines the size of buffer (64MB)
-const BatchSizeInByte = 1 << 16
-
-// ReadMessageContent reads the message type and content size, and return the actual content.
-func ReadMessageContent(s Stream) (content []byte, err error) {
-	var (
-		r = bufio.NewReader(s)
-	)
-	timeoutDuration := 1 * time.Second
-	if err = s.SetReadDeadline(time.Now().Add(timeoutDuration)); err != nil {
-		log.Error("cannot reset deadline for message header read", "error", err)
-		return
-	}
-	//// Read 1 byte for message type
-	if _, err = r.ReadByte(); err != nil {
-		log.Error("failed to read p2p message type field", "error", err)
-		return
-	}
-	// TODO: check on msgType and take actions accordingly
-	//// Read 4 bytes for message size
-	fourBytes := make([]byte, 4)
-	if _, err = io.ReadFull(r, fourBytes); err != nil {
-		log.Error("failed to read p2p message size field", "error", err)
-		return
-	}
-
-	contentLength := int(binary.BigEndian.Uint32(fourBytes))
-	contentBuf := make([]byte, contentLength)
-	timeoutDuration = 20 * time.Second
-	if err = s.SetReadDeadline(time.Now().Add(timeoutDuration)); err != nil {
-		log.Error("cannot reset deadline for message content read", "error", err)
-		return
-	}
-	if _, err = io.ReadFull(r, contentBuf); err != nil {
-		log.Error("failed to read p2p message contents", "error", err)
-		return
-	}
-	content = contentBuf
-	return
-}