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73 lines
2.0 KiB
73 lines
2.0 KiB
package p2p
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import (
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"bufio"
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"bytes"
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"encoding/binary"
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"io"
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"time"
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"github.com/ethereum/go-ethereum/log"
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)
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/*
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P2p Message data structure:
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---- message start -----
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1 byte - p2p type
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0x00: unicast (no need to forward)
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0x01: broadcast (may need to forward to other neighbors)
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4 bytes - message content size n in number of bytes
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content (n bytes) - actual message content
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---- message end -----
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*/
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// BatchSizeInByte defines the size of buffer (64MB)
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const BatchSizeInByte = 1 << 16
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// ReadMessageContent reads the message type and content size, and return the actual content.
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func ReadMessageContent(s Stream) ([]byte, error) {
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var (
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contentBuf = bytes.NewBuffer([]byte{})
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r = bufio.NewReader(s)
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)
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timeoutDuration := 1 * time.Second
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s.SetReadDeadline(time.Now().Add(timeoutDuration))
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//// Read 1 byte for message type
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_, err := r.ReadByte()
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switch err {
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case io.EOF:
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log.Error("Error reading the p2p message type field", "msg", err)
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return contentBuf.Bytes(), err
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case nil:
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//log.Printf("Received p2p message type: %x\n", msgType)
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default:
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log.Error("Error reading the p2p message type field", "msg", err)
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return contentBuf.Bytes(), err
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}
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// TODO: check on msgType and take actions accordingly
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//// Read 4 bytes for message size
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fourBytes := make([]byte, 4)
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n, err := r.Read(fourBytes)
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if err != nil {
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log.Error("Error reading the p2p message size field")
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return contentBuf.Bytes(), err
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} else if n < len(fourBytes) {
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log.Error("Failed reading the p2p message size field: only read", "Num of bytes", n)
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return contentBuf.Bytes(), err
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}
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contentLength := int(binary.BigEndian.Uint32(fourBytes))
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tmpBuf := make([]byte, contentLength)
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timeoutDuration = 20 * time.Second
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s.SetReadDeadline(time.Now().Add(timeoutDuration))
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m, err := io.ReadFull(r, tmpBuf)
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if err != nil || m < contentLength {
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log.Error("Read %v bytes, we need %v bytes", m, contentLength)
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return []byte{}, err
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}
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contentBuf.Write(tmpBuf)
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return contentBuf.Bytes(), nil
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}
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